Transformer protection terminal RET 521 C1 2.5 - ABB Group
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5(7& 1MRK 504 040-BEN Page 1 Issued: March 2004 Revision: Data subject to change without notice
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• Pre-configured transformer terminal for cost-effective engineering and commissioning
- Overexcitation restraint with 5th harmonic
• Easy to order
- Internal CT ratio and vector group adaptation
• Multiple function transformer protection and control terminal in a compact design
- Settable zero sequence current elimination
• Suitable for power transformers and generator-transformer blocks • Two-winding power transformer application • Interposing Current Transformers are not required • Application flexibility through generous settings • Extended operating frequency range by frequency tracking and filter adaptation • Type tested modular software functions • Transformer differential protection - for two-winding transformers - Through-fault stability by settable current bias characteristics - Enhanced through-fault stability for multi-breaker arrangements - Inrush restraint with two selectable combinations of waveform and 2nd harmonic methods. Settable crossblocking between phases - Tap changer position adaptation for increased sensitivity
• Two three-phase nondirectional instantaneous or time delayed overcurrent protection with inverse and definite time characteristics for the HV and LV windings • Two nondirectional instantaneous or time delayed earth fault protections with inverse and definite time characteristics for the HV and LV windings. 2nd harmonic restraining feature can be selected when required • A single-phase time delayed overvoltage protection measuring phase-phase voltage with inverse and definite time characteristics for the LV winding • A time delayed neutral voltage protection for the LV winding • Voltage regulation for single transformer with on load tap changer • Configurable logic with inputs and outputs, AND-, OR-, SR-gates, timers and trip logic for trip and/or indication of external protection features (Buchholz, temperature, etc.) are available using the CAP-tool • Display of service values • Display of event records and trip values
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• Continuous self monitoring and diagnostics • Disturbance recording and data storage for presentation on PC • Menu driven front display with key pad and port connector for PC • Remote data communication with up to 2 ports for station control and station monitoring systems • Available for 19 inch rack mounting in a panel, surface or flush mounting
- One analog input module with 8I & 2U inputs - One binary input module, one binary output module and one mA analog input module (4-20 mA) • Hardware options: - Separate Combitest test switch for reliable and safe testing - On/Off switch for dc supply - Mounting details for IP 40 and IP 54
• Hardware:
The numerical transformer terminal RET 521-C1 is designed for fast and selective protection and control of two-winding transformers, auto-transformers, generator-transformer blocks and shunt reactors.
The RET 521-C1 can be applied for 2-winding applications as indicated below in Figure 1 ZLQGLQJDSSOLFDWLRQV
The RET 521-C1 has low requirements on the main Current Transformers and no interposing CTs are necessary. Flexibility is provided to cover for different applications in form of transformer size, vector groups and system neutral earthing. For big and important transformers such as generator-transformer blocks or large auto transformers two RET 521-C1 can be used to obtain redundancy. Using programmable logic provides a very compact design for protection and control. For changes in the programmable logic the CAP-tool is required.
2-winding power transformer 2-winding power transformer with unconnected delta tertiary winding
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The RET 521-C1 includes setting adaptation to power transformer rating and instrument transformer ratios to allow protection settings in percent (%), of the power transformer rating, thus facilitating the protection settings.
I/O Trip
Figure 1: An application example
Overtemp. etc.
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The differential protection for two windings is one of the most important functions for fast and selective protection of transformers. The RET 521-C1 is provided with internal adaptation for CT ratio matching and vector group compensation, which allows connection directly to Y-connected main CTs. Zero sequence current elimination is made internally, but can alternatively be turned off. All current inputs are provided with restraint features. The setting facilities cover for application of the differential protection to power transformers with or without tap changer. An adaptive differential feature is included for through-faults. By introducing the tap changer position to RET 521-C1, the differential protection pick-up can be set to optimum sensitivity covering low level internal fault currents.
Two units of the nondirectional time delayed earth fault protection are included. The units can measure either residual or connected or neutral point CT.
Stabilization is included to avoid differential protection tripping for inrush currents and for overexcitation. Stabilization is also included for system recovery inrush and CT saturation for external faults. Crossblocking between phases is normally used, but it can alternatively be turned off.
The earth fault protection is recommended as a backup protection for transformer faults or network faults. The earth fault protection is provided with two settable current levels. The lower level can be selected with definite time or inverse time characteristic, and the higher level has definite time characteristic only. Both levels can also be provided with a 2nd harmonic restraint for inrush currents. The earth fault protection can be connected to a CT in the neutral point of the transformer or to residually connected CTs. Service values for residual current is available. /96LQJOHSKDVHWLPHGHOD\HGRYHUYROWDJH SURWHFWLRQ729
A single-phase time delayed overvoltage protection measuring phase-phase voltage is included.
Service values for differential currents, bias current and tap position are available.
The overvoltage protection is recommended as backup for sustained system overvoltages. The overvoltage protection is provided with two settable voltage levels, and both levels are provided with definite time delay. The low stage can alternatively have an inverse time delay.
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Service values for the measured voltage is available.
Two units of the three-phase nondirectional time delayed overcurrent protection are included.
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A fast high set unrestrained differential current protection is also included for high speed tripping at high internal fault currents.
The overcurrent protection is recommended as a backup protection for transformer faults or network faults. The overcurrent protection is provided with two settable current levels. The lower level can be selected with definite time or inverse time characteristic, and the higher level can be selected with definite time characteristic only. Both levels have separate blocking inputs. Service value for the highest current is available.
A time delayed neutral voltage protection is included. The above described overvoltage protection is also suitable as neutral overvoltage protection. The overvoltage protection measures the fundamental frequency component and is therefore insensitive for 3rd and higher harmonics. When used as a neutral overvoltage protection it is typically connected to a VT in the neutral of the transformer or to an open delta connection of the secondary windings of a three-phase set of VTs. As a neutral overvoltage protection it is normally used in high impedance earthed systems, and is given a longer time delay than the feeder earth fault protections.
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The single transformer voltage control function included in RET 521-C1 is used to maintain by the user preset voltage at the low voltage side of the transformer, i.e. at the busbar or at the feeder ends. Constant voltage is obtained by controlling the tap changer position by raise and lower commands. The delay for the regulating command can be of inverse or definite time type. Blocking is included for overcurrent and undervoltage, power system emergencies and tap changer end positions. Line drop compensation is included. A load shedding based on voltage reduction is also included. A built-in power measuring function can be used to create selectivity with other equipment influencing on the system voltage. Number of tap changer operations can be recorded for determining the service intervals. Remote or local command possibilities are included. Alarms from the tap changer auxiliary equipment (binary contacts) can be connected to the voltage control function. The tap changer position is monitored by a 4-20 mA-input to the voltage control function. (17 positions are considered in the configuration). If the number of tap position is other than 17, the tap position number on the MIM block in the configuration has to be changed by use of the CAP-tool. Service values for busbar voltage, compensated voltage, actual set voltage, load voltage adjustment, tap changer position, contact life calculation and no of operation counter are available.
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Configurable logic elements in the form of 40 AND-gates, 40 OR-gates, 20 inverters, 25 timers, 20 pulse elements and 10 SR-gates are available. Some are already used in the configuration and the rest can be combined to suit particular requirements using the CAPtool. 7HUPLQDOGLDJUDP
Terminal diagrams for the connection of the analog inputs, the binary inputs/outputs, the logical circuits and the protection modules, the control modules and the monitoring modules are shown in “Terminal configuration” on page 15 and forward. 3DUDPHWHUVHWWLQJV
RET 521-C1 has wide setting facilities to ensure application flexibility. Factory default settings are chosen to indicate typical setting values or choices. The settings are organized as general settings and settings for each separate function. The main data (ratings) of the protected transformer and ratios of the instrument transformers are entered in the terminal setting and configuration menus. Most of the setting parameters of the particular functions can then be made as per unit (p.u.) or percent (%) values related to the power transformer rating. For some protection functions there also exist a possibility to define the rated value in the setting menu to another value than the power transformer rating. Most timers are set in seconds. There is a possibility to enter one to four complete groups of settings. It is then easy to switch between these groups locally or from remote.
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External contacts, e.g. from transformer overtemperature devices and Buchholz gas detector, can be connected via Binary Inputs. Logic can be arranged for alarm, event logging and tripping. For redundancy reasons it is recommended to route tripping from the Buchholz or overpressure device in parallel to RET 521-C1.
Settings can be changed from the front Human-Machine-Interface (HMI), or by a portable personal computer (PC), with a parameter setting program (PST), included in CAP 540, connected to a fibre-optic connector socket at the front, or from another location over a data communication system.
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Operation indications and time-tagged events are available from the front HMI or a connected PC and from another location over a data communication system. Actual input quantity values, load, differential current and other service values can also be read from the terminal.
The tripping commands are configured to trip logic blocks, which then are configured to the tripping output relays. Each trip logic block (OR gate) has 16 inputs. 3 trip logic blocks are used in the standard configuration. An additional 9 blocks are available using the CAP-tool.
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Sampled data from a disturbance, like a tripping operation, can be stored and made available for oscillographic presentation and evaluation on a front connected PC or from another location over a data communication system, to which the disturbance files are transferred. This function stores continuously sampled data in a cyclic buffer. At
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The physical design of terminal RET 521-C1 is in line with the products in the REx 500series. It is housed in painted sheet steel enclosure suitable for different mounting by use of particular mounting accessories. Wire connections are made at the rear side at terminals of compression type tightened by a screw. Fibre optic wires for data communication are also connected at the rear side. On the front is a HMI-panel and socket with an optic interface for a specific cable to a portable PC. Behind the front there is an interconnection board, a motherboard, to which printed board assemblies (PBAs) are plugged in from the rear side. The input module for analog AC quantities is fixed mounted and the connection terminal for these circuits are also fixed mounted. The connection terminals for the DC contact circuits are of the multipole detachable type so as to facilitate disconnection for exchange of PBAs. The following modules are included in the RET521-C1 terminal: • One analog input module for 8 currents and 2 voltages with galvanic separation and adaptation of the AC signals. The analog input module also contains an analog
selectable trigger conditions the data are stored, so that both prefault and fault data are saved. 'DWDFRPPXQLFDWLRQ
Two remote communication ports for SPA and LON can be included. They enable cooperation with a station monitoring system (SMS) including a remotely located PC, and a station control system (SCS). to digital converter (A/D-converter) which provides the necessary conversion and some filtering. • Processor modules with data processing for the protection as well as other functions and communication. As an option two communication interfaces can be added for connection to a station monitoring system (SMS) including a remotely located PC and a station control system (SCS). • Power supply module with DC/DC converter for the electronic circuits. • One binary input module, BIM, with 16 binary inputs and one binary output module, BOM, with 24 output relay contacts are included. • One mA-analog input board with 6 channels for 4-20 mA is included. • The front HMI panel includes three lightemitting diodes (LEDs), one LCD display with 4 lines times 16 characters. There is also a six button key pad and a fibre-optic connector socket, for connection to the serial port of a portable PC by means of a special interface cable.
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Current Burden
Ir = 1 A or 5 A < 0.25 VA at Ir
(0.2-30) x Ir (0.2-4) x Ir continuously
(0.03 - 100) x Ir 100 x Ir for 1 s*
AC voltage Ph-Ph** Burden
Ur = 100/110/115/120 V < 0.2 VA at Ur
80-120% of Ur
1.5 x Ur continuously 2.5 x Ur for 1 s
Frequency
fr = 50/60 Hz
±2.5 Hz
±5 Hz
Frequency with extended range
fr = 50/60 Hz
(0.7-1.2) x fr
(0.65-1.25) x fr
EL = 24 - 60 V EL = 90 - 250 V
±20% ±20%
±20% ±20%
±20% ±20% ±20% ±20%
±20% ±20% ±20% ±20%
Auxiliary DC voltage EL power consumption (terminal equipped with all IO-modules)
Auxiliary DC power in-rush
Binary input module DC voltage RL
< 35 W
220 VDC, 0,95
Operate time IEC curves Definite time setting
Class 5 and -0/+40 ms ±0.5% of setting -0/+40 ms
Reset time
Typical 35 ms
Transient overreach for DC offset L/R 0.95
Operate time IEC curves Definite time setting
Class 5 and -0/+40ms ±0,5% of setting -0/+40ms
Reset time
Typical 35 ms
Transient overreach for DC offset L/R 0.99
Operate time IEC curves Definite time setting
Class 5 and 0/+40ms ±0,5% of setting 0/+40ms
Reset time
Typical 35 ms
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The Time delayed Overvoltage Protection is used for this application
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Voltage control set voltage, % of Ur2*
Uset
85.0-120.0% acc < 0.5% of Ur
Set voltage deadband, % of Ur2
Udeadband
0.5-9.0%
Set inner deadband, % of Ur2
UdeadbandInner
0.1-9.0%
Upper limit busbar voltage
Umax
80-180% acc < 0.5% of Ur
Lower limit busbar voltage
Umin
70-120% acc < 0.5% of Ur
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Fast step down function activation
FSDMode
Off, Auto, AutoMan
Time characteristic for Time 1 (first command)
t1Use
Const Inverse
Time delay for first command
t1
1-300 s
Time characteristic for Time 2 (consecutive command)
t2Use
Const Inverse
Time delay for consecutive command
t2
1-300 s
Minimum operating time in sec
tMin
1.0-30.0 s
Operation line voltage drop compensation
OperationLDC
Off/On
Regulation for capacitive load
OperCapaLDC
Off/On
Line resistance, primary values
Rline
0.0-150.0 ohm
Line reactance, primary values
Xline
-150.0 to 150.0 ohm
Constant load voltage adjust factor 1
LVAConst1
-9.0 to 9.0%
Constant load voltage adjust factor 2
LVAConst2
-9.0 to 9.0%
Constant load voltage adjust factor 3
LVAConst3
-9.0 to 9.0%
Constant load voltage adjust factor 4
LVAConst4
-9.0 to 9.0%
Load current dependent automatic voltage reduction factor
VRAuto
-4.0 to 4.0%
Undervoltage blocking, % of Ur2
Ublock
50-90%
Operation OLTC reversed action blocking
OperationRA
Off/On
Power system emergency blocking time
tRevAct
30-360 s
Tap changer low limit position Setting 0 is for special configuration of auto block feature
LowVoltTap
0 and 1-64
Tap changer high limit position Setting 0 is for special configuration of auto block feature
HighVoltTap
0 and 1-64
Overcurrent blocking, % of object Ir1
Iblock
0-250%
Output pulse duration
tPulseDur
0.5-5.0 s
Tap changer constant timeout time
tTCTimeout
1-60 s
Operate level for Active Power in forward direction of Power monitoring function
Pforw
-9999.99-9999.99 MW
Operate level for Active Power in reverse direction of Power monitoring function
Prev
-9999.99-9999.99 MW
Operate level for Reactive Power in forward direction of Power monitoring function
Qforw
-9999.99-9999.99 MvAr
Operate level for Reactive Power in reverse direction of Power monitoring function
Qrev
-9999.99-9999.99 MVAr
Power monitoring function time delay
tPower
1-60 s
Hunting detection alarm, max operation/day
DayHuntDetect
0-100
Hunting detection alarm, max operation/hour
HourHuntDetect
0-30
Time sliding window hunting detection
tHuntDetect
1-120 min.
Hunting detection alarm, max operation/wind
NoOpWindow
3-30
Contact life counter factor
CLFactor
1.0 -3.0
Initial value tap changer life counter
InitCLCounter
0-9999999
External MMI operation priority mode
ExtMMIPrio
Priority/No Priority
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Total block of the voltage control function
TotalBlock
Off/On
Automatic mode block of the voltage control
AutoBlock
Off/On
*) Rated secondary side power transformer voltage set in menu Transformer data
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Disturbance Recorder for all 10 analogue inputs AI 1(I)
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Event Recorder for 48 binary signals TOC1
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Figure 2: RET 521-C1 terminal function configuration
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The numbers (50, 87 etc.) used in Figure 2 are in accordance with the standard IEEE C 37.2 - 1991. Table 25 gives a short
overview about used numbers and the particular functions within RET 521 which fulfills that functionality.
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Three-phase overcurrent protection with two stages. First stage with inverse or definite time delay. Second stage definite time delay only. Time delay can be set to zero. Functions with this functionality in RET 521 terminal are TOC1 & TOC2. These functions can be used as HV and LV overcurrent protection.
50N/51N 50G/51G
Single-phase overcurrent protection with two stages. First stage with inverse or definite time delay. Second stage definite time delay only. Time delay can be set to zero. Functions with this functionality in RET 521 terminal are TEF1 & TEF2. These functions can be used as HV and LV residual or neutral point earth fault (ground fault) protection.
59 59N
Overvoltage protection with two stages. First stage with inverse or definite time delay. Second stage definite time delay only. Time delay can be set to zero. Functions with this functionality in RET 521 terminal are TOV1 & TOV2. These functions can be used as LV overvoltage or open delta overvoltage protection.
87T/87H
Transformer differential protection with two operating stages. First stage is restrained against inrush currents and transformer overexcitation. Second stage is unrestrained (instantaneous). Function with this functionality in RET 521 terminal is DIFP. This function can be used as transformer, autotransformer or reactor differential protection.
90
Automatic power transformer voltage (on-load tap-changer) control. Function with this functionality in RET 521 terminal is VCTR for single transformer. This function can be used for automatic transformer OLTC position regulation. Function includes line drop compensation, overcurrent blocking, undervoltage blocking, etc.
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1A 5A
AI 4(I)
1A 5A
AI 5(I)
1A 5A
AI 6(I)
1A 5A
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1A 5A
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1A 5A
HMI
INTERNAL FAIL
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1a) COMMUNICATION PORT TO SCS OR SMS WHEN INCLUDED. 1b) OPTICAL PORT FROM LOCAL HMI CONNECTION MADE WITH A SPECIAL INTERFACE CABLE. 2)
COMMUNICATION PORT TO SCS WHEN LON IS INCLUDED.
3)
INTERNAL FAIL.
4)
EL.
5)
mA FOR TAP POSITION.
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Figure 3: 2 Winding Transformer Protection Terminal Diagram
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RET 521-C1 terminals are intended for two-winding transformer applications. The analog transformer input module type AIM has 10 input transformers. RET 521-C1 occupies 3/4 of a 6U 19 inch rack. 6RIWZDUHEDVLFIXQFWLRQV
Frequency measurement function, FRME Service value reading, SVR Event recording and trip value recording (in disturbance report), ER Custom logic programming (40 AND, 40 OR, 20 inverters, 25 timers, 20 pulse timers, 10 SRgates and 3 MOVE blocks) is included and available using the CAP-tool, CL1 Trip logic with 12 blocks is included and available using the CAP-tool, TL Binary converter, BC Event function (single and double indications), EV Command function (single and multiple), CD and CM
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%DVLFGDWD Nominal frequency:
50/60 Hz
Rated VT input voltage (across each individual input)
100/√3, 110/√3, 115/√3, 120/√3, 100, 110, 115, 120 V
Rated CT input current
1/5 A
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Transformer differential protection for two windings Transformer differential protection ',)3
Three-phase nondirectional time delayed overcurrent protection First time delayed overcurrent protection 72&
Second time delayed overcurrent protection 72&
Nondirectional time delayed earth fault protection First earth fault time current protection 7()
Second earth fault time current protection 7()
Single-phase time delayed overvoltage protection or time delayed neutral voltage protection First time delayed overvoltage protection 729
Second time delayed overvoltage protection 729)
Single transformer voltage control (On-load tap changer control) Voltage control 9&75
Disturbance recorder
Disturbance recorder '5
+DUGZDUHLQFOXGHGLQ5(7& One AIM 8I+2U in position
One Binary In module in position
One Binary Out module in position
One mA input module in position
Intended for transformer with
Power Supply Module
P3
P9
P10
P12
2 windings
P14
BIM = 16 Optocoupler Inputs. Please specify rated voltage of optocoupler inputs below BOM = 24 Contact Outputs MIM = 6 analog (i.e. mA) inputs
Please specify with “X” mark the selected alternative 3600RGXOH Auxiliary dc voltage EL
24-60 V
1MRK 002 239-AA
90-250 V
1MRK 002 239-BA
$YDLODEOHUDWHG9ROWDJHVIRU2SWRFRXSOHU,QSXWVRQ%,00RGXOH Input Module 1 (Located in Slot P9)
24/30 V dc
48/60 V dc
110/125 V dc
220/250 V dc
1MRK 000 508-DB
1MRK 000 508-AB
1MRK 000 508-BB
1MRK 000 508-CB
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$YDLODEOHRSWLRQV SPA = Plastic LON = Plastic
SPA = Plastic LON = Glass
SPA = Glass LON = Glass
1MRK 001 608 -AA
1MRK 001 608-BA
1MRK 001 608-CA
Rear communication via SPA & LON bus
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7HVWVZLWFK COMBITEST test switch module RTXP
1MRK 000 371-EA
Current circuits connected for rated current
1A
On/Off switch for the dc-supply
RK 795 017-AA
5A
NOTE! The test switch have internal star point connection for three-phase CT groups The test switch module RTXP 24 will be mounted with the transformer protection terminal in RHGS 6 case with window door forming a full 19” case Rated current (1 or 5 A) to be specified for the connection between test switch and terminal. The terminal is reconnectable and can at any time be altered between 1 or 5 A, but the terminal will be delivered with all current channels connected to either 1 A or to 5 A.
0RXQWLQJGHWDLOV Mounting details with IP40 degree of protection for the front of the protection terminal case.
19” rack mounting of 3/4 of 19” terminal casing
1MRK 000 020-BA
19” rack mounting (applicable for terminal together with test switch)
1MRK 000 020-CA
Wall mounting
1MRK 000 020-DA
Flush mounting
1MRK 000 020-Y
Flush mounting with IP54 (applicable for terminal only)
1MKC 980 001-2
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Quantity:
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0DQXDOV One User Documentation CD-ROM with all 500 series manuals is always delivered with each terminal
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5XOH 6SHFLI\WKHQXPEHURISULQWHGPDQXDOVUHTXHVWHG Operator´s manual
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Technical reference manual
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Installation and commissioning manual
Quantity:
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Application manual
Quantity:
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&XVWRPHUIHHGEDFN For our reference and statistics we would be pleased if we are provided with the following application data:
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Country:
End user:
Station name:
Voltage level:
kV
Transformer Rated Power:
MVA
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1MRK 511 142-BEN
Accessories for REx 5xx
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COMBITEST Test system
1MRK 512 001-BEN
Auxiliary relays
1MRK 508 015-BEN
Numerical transformer protection and control terminal type RET 521-C1 with continuous self monitoring and analogue/digital conversion of all input quantities. The terminal is suitable for protection, control and monitoring of two-winding transformers, auto-transformers, generatortransformer block units and shunt reactors. The numerical transformer terminal is designed to operate correctly over a wide frequency range to accommodate for system frequency variations during generator start-up or shut-down. The differential protection for two windings is provided with adaptive 2nd harmonic and waveblock restraint features to avoid tripping
at magnetizing inrush and 5th harmonic restraint to avoid tripping at overexcitation. The differential function is stable for external faults followed by heavy CT saturation and recovery inrush currents. The differential protection has a settable restraint characteristic. Tap-changer position indication is used to provide maximum sensitivity for the differential protection. A high-set unrestrained differential current protection is included. Two tree-phase nondirectional time delayed overcurrent protections, two nondirectional time delayed earth fault protections, a singlephase time delayed overvoltage protection and a time delayed neutral voltage protection are included in the RET521-C1.
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Voltage regulation for single transformer with On-Load-Tap-Changer is also included in the RET 521-C1 numerical transformer terminal. The terminal is provided with a preconfigured and type tested programmable logic for trip and indications and configuration of the included protection, control and monitoring functions. Modules for binary inputs and binary outputs to facilitate user adaptation and a mA transducer input module are included.
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$%%$XWRPDWLRQ7HFKQRORJLHV$% Substation Automation SE-721 59 Västerås Sweden Telephone: +46 (0) 21 34 20 00 Facsimile: +46 (0) 21 14 69 18 Internet: www.abb.com/substationautomation
The terminal is provided with a front mounted menu driven human-machine-interface and a front port optical connector for a personal computer. Service value display of voltage, currents, frequency, event recording with 150 events and 10 recordings, and disturbance recording with 10 analogue signals and 48 digital signals for 40 s, and local data storage are available. Communication with the terminal is provided with two ports for LON and SPA in the rear for station control and station monitoring purpose.
5(7& 1MRK 504 040-BEN Page 1 Issued: March 2004 Revision: Data subject to change without notice
(SE960158)
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• Pre-configured transformer terminal for cost-effective engineering and commissioning
- Overexcitation restraint with 5th harmonic
• Easy to order
- Internal CT ratio and vector group adaptation
• Multiple function transformer protection and control terminal in a compact design
- Settable zero sequence current elimination
• Suitable for power transformers and generator-transformer blocks • Two-winding power transformer application • Interposing Current Transformers are not required • Application flexibility through generous settings • Extended operating frequency range by frequency tracking and filter adaptation • Type tested modular software functions • Transformer differential protection - for two-winding transformers - Through-fault stability by settable current bias characteristics - Enhanced through-fault stability for multi-breaker arrangements - Inrush restraint with two selectable combinations of waveform and 2nd harmonic methods. Settable crossblocking between phases - Tap changer position adaptation for increased sensitivity
• Two three-phase nondirectional instantaneous or time delayed overcurrent protection with inverse and definite time characteristics for the HV and LV windings • Two nondirectional instantaneous or time delayed earth fault protections with inverse and definite time characteristics for the HV and LV windings. 2nd harmonic restraining feature can be selected when required • A single-phase time delayed overvoltage protection measuring phase-phase voltage with inverse and definite time characteristics for the LV winding • A time delayed neutral voltage protection for the LV winding • Voltage regulation for single transformer with on load tap changer • Configurable logic with inputs and outputs, AND-, OR-, SR-gates, timers and trip logic for trip and/or indication of external protection features (Buchholz, temperature, etc.) are available using the CAP-tool • Display of service values • Display of event records and trip values
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• Continuous self monitoring and diagnostics • Disturbance recording and data storage for presentation on PC • Menu driven front display with key pad and port connector for PC • Remote data communication with up to 2 ports for station control and station monitoring systems • Available for 19 inch rack mounting in a panel, surface or flush mounting
- One analog input module with 8I & 2U inputs - One binary input module, one binary output module and one mA analog input module (4-20 mA) • Hardware options: - Separate Combitest test switch for reliable and safe testing - On/Off switch for dc supply - Mounting details for IP 40 and IP 54
• Hardware:
The numerical transformer terminal RET 521-C1 is designed for fast and selective protection and control of two-winding transformers, auto-transformers, generator-transformer blocks and shunt reactors.
The RET 521-C1 can be applied for 2-winding applications as indicated below in Figure 1 ZLQGLQJDSSOLFDWLRQV
The RET 521-C1 has low requirements on the main Current Transformers and no interposing CTs are necessary. Flexibility is provided to cover for different applications in form of transformer size, vector groups and system neutral earthing. For big and important transformers such as generator-transformer blocks or large auto transformers two RET 521-C1 can be used to obtain redundancy. Using programmable logic provides a very compact design for protection and control. For changes in the programmable logic the CAP-tool is required.
2-winding power transformer 2-winding power transformer with unconnected delta tertiary winding
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Comm.
The RET 521-C1 includes setting adaptation to power transformer rating and instrument transformer ratios to allow protection settings in percent (%), of the power transformer rating, thus facilitating the protection settings.
I/O Trip
Figure 1: An application example
Overtemp. etc.
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The differential protection for two windings is one of the most important functions for fast and selective protection of transformers. The RET 521-C1 is provided with internal adaptation for CT ratio matching and vector group compensation, which allows connection directly to Y-connected main CTs. Zero sequence current elimination is made internally, but can alternatively be turned off. All current inputs are provided with restraint features. The setting facilities cover for application of the differential protection to power transformers with or without tap changer. An adaptive differential feature is included for through-faults. By introducing the tap changer position to RET 521-C1, the differential protection pick-up can be set to optimum sensitivity covering low level internal fault currents.
Two units of the nondirectional time delayed earth fault protection are included. The units can measure either residual or connected or neutral point CT.
Stabilization is included to avoid differential protection tripping for inrush currents and for overexcitation. Stabilization is also included for system recovery inrush and CT saturation for external faults. Crossblocking between phases is normally used, but it can alternatively be turned off.
The earth fault protection is recommended as a backup protection for transformer faults or network faults. The earth fault protection is provided with two settable current levels. The lower level can be selected with definite time or inverse time characteristic, and the higher level has definite time characteristic only. Both levels can also be provided with a 2nd harmonic restraint for inrush currents. The earth fault protection can be connected to a CT in the neutral point of the transformer or to residually connected CTs. Service values for residual current is available. /96LQJOHSKDVHWLPHGHOD\HGRYHUYROWDJH SURWHFWLRQ729
A single-phase time delayed overvoltage protection measuring phase-phase voltage is included.
Service values for differential currents, bias current and tap position are available.
The overvoltage protection is recommended as backup for sustained system overvoltages. The overvoltage protection is provided with two settable voltage levels, and both levels are provided with definite time delay. The low stage can alternatively have an inverse time delay.
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Service values for the measured voltage is available.
Two units of the three-phase nondirectional time delayed overcurrent protection are included.
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A fast high set unrestrained differential current protection is also included for high speed tripping at high internal fault currents.
The overcurrent protection is recommended as a backup protection for transformer faults or network faults. The overcurrent protection is provided with two settable current levels. The lower level can be selected with definite time or inverse time characteristic, and the higher level can be selected with definite time characteristic only. Both levels have separate blocking inputs. Service value for the highest current is available.
A time delayed neutral voltage protection is included. The above described overvoltage protection is also suitable as neutral overvoltage protection. The overvoltage protection measures the fundamental frequency component and is therefore insensitive for 3rd and higher harmonics. When used as a neutral overvoltage protection it is typically connected to a VT in the neutral of the transformer or to an open delta connection of the secondary windings of a three-phase set of VTs. As a neutral overvoltage protection it is normally used in high impedance earthed systems, and is given a longer time delay than the feeder earth fault protections.
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The single transformer voltage control function included in RET 521-C1 is used to maintain by the user preset voltage at the low voltage side of the transformer, i.e. at the busbar or at the feeder ends. Constant voltage is obtained by controlling the tap changer position by raise and lower commands. The delay for the regulating command can be of inverse or definite time type. Blocking is included for overcurrent and undervoltage, power system emergencies and tap changer end positions. Line drop compensation is included. A load shedding based on voltage reduction is also included. A built-in power measuring function can be used to create selectivity with other equipment influencing on the system voltage. Number of tap changer operations can be recorded for determining the service intervals. Remote or local command possibilities are included. Alarms from the tap changer auxiliary equipment (binary contacts) can be connected to the voltage control function. The tap changer position is monitored by a 4-20 mA-input to the voltage control function. (17 positions are considered in the configuration). If the number of tap position is other than 17, the tap position number on the MIM block in the configuration has to be changed by use of the CAP-tool. Service values for busbar voltage, compensated voltage, actual set voltage, load voltage adjustment, tap changer position, contact life calculation and no of operation counter are available.
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Configurable logic elements in the form of 40 AND-gates, 40 OR-gates, 20 inverters, 25 timers, 20 pulse elements and 10 SR-gates are available. Some are already used in the configuration and the rest can be combined to suit particular requirements using the CAPtool. 7HUPLQDOGLDJUDP
Terminal diagrams for the connection of the analog inputs, the binary inputs/outputs, the logical circuits and the protection modules, the control modules and the monitoring modules are shown in “Terminal configuration” on page 15 and forward. 3DUDPHWHUVHWWLQJV
RET 521-C1 has wide setting facilities to ensure application flexibility. Factory default settings are chosen to indicate typical setting values or choices. The settings are organized as general settings and settings for each separate function. The main data (ratings) of the protected transformer and ratios of the instrument transformers are entered in the terminal setting and configuration menus. Most of the setting parameters of the particular functions can then be made as per unit (p.u.) or percent (%) values related to the power transformer rating. For some protection functions there also exist a possibility to define the rated value in the setting menu to another value than the power transformer rating. Most timers are set in seconds. There is a possibility to enter one to four complete groups of settings. It is then easy to switch between these groups locally or from remote.
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External contacts, e.g. from transformer overtemperature devices and Buchholz gas detector, can be connected via Binary Inputs. Logic can be arranged for alarm, event logging and tripping. For redundancy reasons it is recommended to route tripping from the Buchholz or overpressure device in parallel to RET 521-C1.
Settings can be changed from the front Human-Machine-Interface (HMI), or by a portable personal computer (PC), with a parameter setting program (PST), included in CAP 540, connected to a fibre-optic connector socket at the front, or from another location over a data communication system.
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Operation indications and time-tagged events are available from the front HMI or a connected PC and from another location over a data communication system. Actual input quantity values, load, differential current and other service values can also be read from the terminal.
The tripping commands are configured to trip logic blocks, which then are configured to the tripping output relays. Each trip logic block (OR gate) has 16 inputs. 3 trip logic blocks are used in the standard configuration. An additional 9 blocks are available using the CAP-tool.
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Sampled data from a disturbance, like a tripping operation, can be stored and made available for oscillographic presentation and evaluation on a front connected PC or from another location over a data communication system, to which the disturbance files are transferred. This function stores continuously sampled data in a cyclic buffer. At
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The physical design of terminal RET 521-C1 is in line with the products in the REx 500series. It is housed in painted sheet steel enclosure suitable for different mounting by use of particular mounting accessories. Wire connections are made at the rear side at terminals of compression type tightened by a screw. Fibre optic wires for data communication are also connected at the rear side. On the front is a HMI-panel and socket with an optic interface for a specific cable to a portable PC. Behind the front there is an interconnection board, a motherboard, to which printed board assemblies (PBAs) are plugged in from the rear side. The input module for analog AC quantities is fixed mounted and the connection terminal for these circuits are also fixed mounted. The connection terminals for the DC contact circuits are of the multipole detachable type so as to facilitate disconnection for exchange of PBAs. The following modules are included in the RET521-C1 terminal: • One analog input module for 8 currents and 2 voltages with galvanic separation and adaptation of the AC signals. The analog input module also contains an analog
selectable trigger conditions the data are stored, so that both prefault and fault data are saved. 'DWDFRPPXQLFDWLRQ
Two remote communication ports for SPA and LON can be included. They enable cooperation with a station monitoring system (SMS) including a remotely located PC, and a station control system (SCS). to digital converter (A/D-converter) which provides the necessary conversion and some filtering. • Processor modules with data processing for the protection as well as other functions and communication. As an option two communication interfaces can be added for connection to a station monitoring system (SMS) including a remotely located PC and a station control system (SCS). • Power supply module with DC/DC converter for the electronic circuits. • One binary input module, BIM, with 16 binary inputs and one binary output module, BOM, with 24 output relay contacts are included. • One mA-analog input board with 6 channels for 4-20 mA is included. • The front HMI panel includes three lightemitting diodes (LEDs), one LCD display with 4 lines times 16 characters. There is also a six button key pad and a fibre-optic connector socket, for connection to the serial port of a portable PC by means of a special interface cable.
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Current Burden
Ir = 1 A or 5 A < 0.25 VA at Ir
(0.2-30) x Ir (0.2-4) x Ir continuously
(0.03 - 100) x Ir 100 x Ir for 1 s*
AC voltage Ph-Ph** Burden
Ur = 100/110/115/120 V < 0.2 VA at Ur
80-120% of Ur
1.5 x Ur continuously 2.5 x Ur for 1 s
Frequency
fr = 50/60 Hz
±2.5 Hz
±5 Hz
Frequency with extended range
fr = 50/60 Hz
(0.7-1.2) x fr
(0.65-1.25) x fr
EL = 24 - 60 V EL = 90 - 250 V
±20% ±20%
±20% ±20%
±20% ±20% ±20% ±20%
±20% ±20% ±20% ±20%
Auxiliary DC voltage EL power consumption (terminal equipped with all IO-modules)
Auxiliary DC power in-rush
Binary input module DC voltage RL
< 35 W
220 VDC, 0,95
Operate time IEC curves Definite time setting
Class 5 and -0/+40 ms ±0.5% of setting -0/+40 ms
Reset time
Typical 35 ms
Transient overreach for DC offset L/R 0.95
Operate time IEC curves Definite time setting
Class 5 and -0/+40ms ±0,5% of setting -0/+40ms
Reset time
Typical 35 ms
Transient overreach for DC offset L/R 0.99
Operate time IEC curves Definite time setting
Class 5 and 0/+40ms ±0,5% of setting 0/+40ms
Reset time
Typical 35 ms
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The Time delayed Overvoltage Protection is used for this application
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Voltage control set voltage, % of Ur2*
Uset
85.0-120.0% acc < 0.5% of Ur
Set voltage deadband, % of Ur2
Udeadband
0.5-9.0%
Set inner deadband, % of Ur2
UdeadbandInner
0.1-9.0%
Upper limit busbar voltage
Umax
80-180% acc < 0.5% of Ur
Lower limit busbar voltage
Umin
70-120% acc < 0.5% of Ur
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Fast step down function activation
FSDMode
Off, Auto, AutoMan
Time characteristic for Time 1 (first command)
t1Use
Const Inverse
Time delay for first command
t1
1-300 s
Time characteristic for Time 2 (consecutive command)
t2Use
Const Inverse
Time delay for consecutive command
t2
1-300 s
Minimum operating time in sec
tMin
1.0-30.0 s
Operation line voltage drop compensation
OperationLDC
Off/On
Regulation for capacitive load
OperCapaLDC
Off/On
Line resistance, primary values
Rline
0.0-150.0 ohm
Line reactance, primary values
Xline
-150.0 to 150.0 ohm
Constant load voltage adjust factor 1
LVAConst1
-9.0 to 9.0%
Constant load voltage adjust factor 2
LVAConst2
-9.0 to 9.0%
Constant load voltage adjust factor 3
LVAConst3
-9.0 to 9.0%
Constant load voltage adjust factor 4
LVAConst4
-9.0 to 9.0%
Load current dependent automatic voltage reduction factor
VRAuto
-4.0 to 4.0%
Undervoltage blocking, % of Ur2
Ublock
50-90%
Operation OLTC reversed action blocking
OperationRA
Off/On
Power system emergency blocking time
tRevAct
30-360 s
Tap changer low limit position Setting 0 is for special configuration of auto block feature
LowVoltTap
0 and 1-64
Tap changer high limit position Setting 0 is for special configuration of auto block feature
HighVoltTap
0 and 1-64
Overcurrent blocking, % of object Ir1
Iblock
0-250%
Output pulse duration
tPulseDur
0.5-5.0 s
Tap changer constant timeout time
tTCTimeout
1-60 s
Operate level for Active Power in forward direction of Power monitoring function
Pforw
-9999.99-9999.99 MW
Operate level for Active Power in reverse direction of Power monitoring function
Prev
-9999.99-9999.99 MW
Operate level for Reactive Power in forward direction of Power monitoring function
Qforw
-9999.99-9999.99 MvAr
Operate level for Reactive Power in reverse direction of Power monitoring function
Qrev
-9999.99-9999.99 MVAr
Power monitoring function time delay
tPower
1-60 s
Hunting detection alarm, max operation/day
DayHuntDetect
0-100
Hunting detection alarm, max operation/hour
HourHuntDetect
0-30
Time sliding window hunting detection
tHuntDetect
1-120 min.
Hunting detection alarm, max operation/wind
NoOpWindow
3-30
Contact life counter factor
CLFactor
1.0 -3.0
Initial value tap changer life counter
InitCLCounter
0-9999999
External MMI operation priority mode
ExtMMIPrio
Priority/No Priority
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Total block of the voltage control function
TotalBlock
Off/On
Automatic mode block of the voltage control
AutoBlock
Off/On
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Event Recorder for 48 binary signals TOC1
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Figure 2: RET 521-C1 terminal function configuration
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The numbers (50, 87 etc.) used in Figure 2 are in accordance with the standard IEEE C 37.2 - 1991. Table 25 gives a short
overview about used numbers and the particular functions within RET 521 which fulfills that functionality.
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Three-phase overcurrent protection with two stages. First stage with inverse or definite time delay. Second stage definite time delay only. Time delay can be set to zero. Functions with this functionality in RET 521 terminal are TOC1 & TOC2. These functions can be used as HV and LV overcurrent protection.
50N/51N 50G/51G
Single-phase overcurrent protection with two stages. First stage with inverse or definite time delay. Second stage definite time delay only. Time delay can be set to zero. Functions with this functionality in RET 521 terminal are TEF1 & TEF2. These functions can be used as HV and LV residual or neutral point earth fault (ground fault) protection.
59 59N
Overvoltage protection with two stages. First stage with inverse or definite time delay. Second stage definite time delay only. Time delay can be set to zero. Functions with this functionality in RET 521 terminal are TOV1 & TOV2. These functions can be used as LV overvoltage or open delta overvoltage protection.
87T/87H
Transformer differential protection with two operating stages. First stage is restrained against inrush currents and transformer overexcitation. Second stage is unrestrained (instantaneous). Function with this functionality in RET 521 terminal is DIFP. This function can be used as transformer, autotransformer or reactor differential protection.
90
Automatic power transformer voltage (on-load tap-changer) control. Function with this functionality in RET 521 terminal is VCTR for single transformer. This function can be used for automatic transformer OLTC position regulation. Function includes line drop compensation, overcurrent blocking, undervoltage blocking, etc.
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1A 5A
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1A 5A
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1A 5A
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1A 5A
AI 8(I)
1A 5A
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30
X121:10 X121:11 MI.13 X121:12 X121:13 MI.14 X121:14 X121:15 MI.15 X121:16 X121:17 MI.16 X121:18
1a) COMMUNICATION PORT TO SCS OR SMS WHEN INCLUDED. 1b) OPTICAL PORT FROM LOCAL HMI CONNECTION MADE WITH A SPECIAL INTERFACE CABLE. 2)
COMMUNICATION PORT TO SCS WHEN LON IS INCLUDED.
3)
INTERNAL FAIL.
4)
EL.
5)
mA FOR TAP POSITION.
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Figure 3: 2 Winding Transformer Protection Terminal Diagram
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RET 521-C1 terminals are intended for two-winding transformer applications. The analog transformer input module type AIM has 10 input transformers. RET 521-C1 occupies 3/4 of a 6U 19 inch rack. 6RIWZDUHEDVLFIXQFWLRQV
Frequency measurement function, FRME Service value reading, SVR Event recording and trip value recording (in disturbance report), ER Custom logic programming (40 AND, 40 OR, 20 inverters, 25 timers, 20 pulse timers, 10 SRgates and 3 MOVE blocks) is included and available using the CAP-tool, CL1 Trip logic with 12 blocks is included and available using the CAP-tool, TL Binary converter, BC Event function (single and double indications), EV Command function (single and multiple), CD and CM
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%DVLFGDWD Nominal frequency:
50/60 Hz
Rated VT input voltage (across each individual input)
100/√3, 110/√3, 115/√3, 120/√3, 100, 110, 115, 120 V
Rated CT input current
1/5 A
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5(7& 1MRK 504 040-BEN Page 21
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Transformer differential protection for two windings Transformer differential protection ',)3
Three-phase nondirectional time delayed overcurrent protection First time delayed overcurrent protection 72&
Second time delayed overcurrent protection 72&
Nondirectional time delayed earth fault protection First earth fault time current protection 7()
Second earth fault time current protection 7()
Single-phase time delayed overvoltage protection or time delayed neutral voltage protection First time delayed overvoltage protection 729
Second time delayed overvoltage protection 729)
Single transformer voltage control (On-load tap changer control) Voltage control 9&75
Disturbance recorder
Disturbance recorder '5
+DUGZDUHLQFOXGHGLQ5(7& One AIM 8I+2U in position
One Binary In module in position
One Binary Out module in position
One mA input module in position
Intended for transformer with
Power Supply Module
P3
P9
P10
P12
2 windings
P14
BIM = 16 Optocoupler Inputs. Please specify rated voltage of optocoupler inputs below BOM = 24 Contact Outputs MIM = 6 analog (i.e. mA) inputs
Please specify with “X” mark the selected alternative 3600RGXOH Auxiliary dc voltage EL
24-60 V
1MRK 002 239-AA
90-250 V
1MRK 002 239-BA
$YDLODEOHUDWHG9ROWDJHVIRU2SWRFRXSOHU,QSXWVRQ%,00RGXOH Input Module 1 (Located in Slot P9)
24/30 V dc
48/60 V dc
110/125 V dc
220/250 V dc
1MRK 000 508-DB
1MRK 000 508-AB
1MRK 000 508-BB
1MRK 000 508-CB
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5(7& 1MRK 504 040-BEN Page 22
6&6DQG606FRPPXQLFDWLRQFDSDELOLWLHV
$YDLODEOHRSWLRQV SPA = Plastic LON = Plastic
SPA = Plastic LON = Glass
SPA = Glass LON = Glass
1MRK 001 608 -AA
1MRK 001 608-BA
1MRK 001 608-CA
Rear communication via SPA & LON bus
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7HVWVZLWFK COMBITEST test switch module RTXP
1MRK 000 371-EA
Current circuits connected for rated current
1A
On/Off switch for the dc-supply
RK 795 017-AA
5A
NOTE! The test switch have internal star point connection for three-phase CT groups The test switch module RTXP 24 will be mounted with the transformer protection terminal in RHGS 6 case with window door forming a full 19” case Rated current (1 or 5 A) to be specified for the connection between test switch and terminal. The terminal is reconnectable and can at any time be altered between 1 or 5 A, but the terminal will be delivered with all current channels connected to either 1 A or to 5 A.
0RXQWLQJGHWDLOV Mounting details with IP40 degree of protection for the front of the protection terminal case.
19” rack mounting of 3/4 of 19” terminal casing
1MRK 000 020-BA
19” rack mounting (applicable for terminal together with test switch)
1MRK 000 020-CA
Wall mounting
1MRK 000 020-DA
Flush mounting
1MRK 000 020-Y
Flush mounting with IP54 (applicable for terminal only)
1MKC 980 001-2
)URQWFRQQHFWLRQFDEOH Front connection cable between LCD-HMI and PC for terminal handling (Opto/9-pole D-sub connectors)
Quantity:
1MKC 950 001-2
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0DQXDOV One User Documentation CD-ROM with all 500 series manuals is always delivered with each terminal
5XOH 6SHFLI\WKHQXPEHURIH[WUD&'¶VUHTXHVWHG
Quantity:
1MRK 002 270-AA
5XOH 6SHFLI\WKHQXPEHURISULQWHGPDQXDOVUHTXHVWHG Operator´s manual
Quantity:
1MRK 504 039-UEN
Technical reference manual
Quantity:
1MRK 504 036-UEN
Installation and commissioning manual
Quantity:
1MRK 504 038-UEN
Application manual
Quantity:
1MRK 504 037-UEN
&XVWRPHUIHHGEDFN For our reference and statistics we would be pleased if we are provided with the following application data:
5HODWHG GRFXPHQWV
Country:
End user:
Station name:
Voltage level:
kV
Transformer Rated Power:
MVA
7HFKQLFDORYHUYLHZEURFKXUH CAP 540*1.3, terminal tool box
6DPSOH 6SHFLILFDWLRQ
1MRK 511 142-BEN
Accessories for REx 5xx
1MRK 514 009-BEN
COMBITEST Test system
1MRK 512 001-BEN
Auxiliary relays
1MRK 508 015-BEN
Numerical transformer protection and control terminal type RET 521-C1 with continuous self monitoring and analogue/digital conversion of all input quantities. The terminal is suitable for protection, control and monitoring of two-winding transformers, auto-transformers, generatortransformer block units and shunt reactors. The numerical transformer terminal is designed to operate correctly over a wide frequency range to accommodate for system frequency variations during generator start-up or shut-down. The differential protection for two windings is provided with adaptive 2nd harmonic and waveblock restraint features to avoid tripping
at magnetizing inrush and 5th harmonic restraint to avoid tripping at overexcitation. The differential function is stable for external faults followed by heavy CT saturation and recovery inrush currents. The differential protection has a settable restraint characteristic. Tap-changer position indication is used to provide maximum sensitivity for the differential protection. A high-set unrestrained differential current protection is included. Two tree-phase nondirectional time delayed overcurrent protections, two nondirectional time delayed earth fault protections, a singlephase time delayed overvoltage protection and a time delayed neutral voltage protection are included in the RET521-C1.
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Voltage regulation for single transformer with On-Load-Tap-Changer is also included in the RET 521-C1 numerical transformer terminal. The terminal is provided with a preconfigured and type tested programmable logic for trip and indications and configuration of the included protection, control and monitoring functions. Modules for binary inputs and binary outputs to facilitate user adaptation and a mA transducer input module are included.
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$%%$XWRPDWLRQ7HFKQRORJLHV$% Substation Automation SE-721 59 Västerås Sweden Telephone: +46 (0) 21 34 20 00 Facsimile: +46 (0) 21 14 69 18 Internet: www.abb.com/substationautomation
The terminal is provided with a front mounted menu driven human-machine-interface and a front port optical connector for a personal computer. Service value display of voltage, currents, frequency, event recording with 150 events and 10 recordings, and disturbance recording with 10 analogue signals and 48 digital signals for 40 s, and local data storage are available. Communication with the terminal is provided with two ports for LON and SPA in the rear for station control and station monitoring purpose.
