RTU500 series
500CVD21 Data sheet
Application The Multimeter 500CVD21 is used for measuring analog AC input signals from three independent phases with optional inputs for neutral current and voltage. The module can measure currents from 6 or 8 feeders (3 phase systems) depending on the current input configuration. For each phase voltage and current are measured directly and a number of calculated values are generated by the module. In addition the module detects the fault current and the over current direction. The module supports configurations with 2, 3 or 4 voltage transformers. There are several versions available: Versions
Type
LO
HI
500CVD21 R0121
4U24I
x
500CVD21 R0125
4U24I
x
500CVD21 R0141
4U24I
x
500CVD21 R0145
4U24I
x
1A
5A
x x x x
Figure 1: 500CVD21 Application
Characteristics The Multimeter is a microprocessor-based Intelligent Electronic Device (IED) intended for current, voltage, power and energy measurement. In addition fault current detection and over current direction are available. Current and voltage inputs are connected via transformer only (see Wiring). The module has a measurement interface supporting voltage measurement for one 3 phase system with 2, 3 or 4 voltage transformers. The device has 24 current inputs supporting measurement configurations for 6 or 8 three phase systems (feeders). Calculated values are scaled by user programmed constants for current and voltage transformers. All values are updated after 320 ms. The fault current is measured up to 20 times nominal current. The current inputs withstand 50 times nominal current for 1 s. The first binary output of the multimeter can be used for indicating an overall trip and pickup event.
Wiring
Figure 2: Voltage input with 2 voltage transformers (3P3W3U)
Figure 3: Voltage input with 3 voltage transformers (3P4W3U)
Figure 6: Current inputs with 3 CT per feeder, 3I (Ia, Ib, Ic)
Figure 4: Voltage input with 4 voltage transformers (3P4W4U)
Figure 7: Current inputs with 4 CT per feeder, 4I (Ia, Ib, Ic, I0)
Figure 5: Current inputs with 2 CT per feeder, 2I (Ia, Ic)
Figure 8: Current inputs with 3 CT per feeder, 3I (Ia, I0, Ic)
Meter Operation The following measured or calculated values are available from the module.
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Instantaneous Meter Values
Voltage / Current Distortion (THD)
Following values are measured by true RMS conversion
The 500CVD21 provides a measure of the total harmonic distortion (THD), in each phase voltage and current waveform, as a percentage deviation from pure 50Hz or 60Hz sine waves. THD is calculated by Fast Fourier Transform algorithm (FFT).
Measurement
Measuring Path
Neutral voltage
Phase 1-N, 2-N, 3-N Voltage N, Voltage line unbalance
– U1, U2, U3, UN
Phase voltage
Phase 1-2, 2-3, 1-3
– I1, I2, I3, IN
Current
Phase 1, 2, 3, N, Unbalance
Fault current
Phase 1, 2, 3, N
Active power (Watt)
Phase 1, 2, 3, total
Reactive power (Var)
Phase 1, 2, 3, total
Apparent power (VA)
Phase 1, 2, 3, total
Power factor (PF)
Phase 1, 2, 3, total
Phase angle
Phase 1, 2, 3, total
Frequency
System
Phase rotation
Positive/ negative sequence
The Multimeter supports 4 quadrant power values.
Fault current detection The devices are with three phases and one neutral for over current detection. The programming of the time current characteristics is identical in all application to require establishing the control variables: trip time delayed curve, curve multiplier, pickup current and reset timing. The curve reference follows ANSI, IEEE, IEC standards (ANSI C37.90, IEEE C37.112-1996, IEC 255-4, BF412).
Directional overcurrent Detection Directional overcurrent detection is for the protection of multiple source feeders to distinguish between faults in different directions. The device incorporates for three phase and neutral overcurrent detection with a secure 90° as quadrant coordination in phase directional polarization. Thus, a selected polarizing voltage should have a function to keep reasonable constant, no matter what operating status in a non-faulted or faulted system. Phase directional overcurrent Phase directional detection, it requires operating current to determine whether current flow in each phase is in forward or reverse direction, as determined by the connection of the phase source, selected MTA angle, voltage and current phasors.
Figure 9: Power measurement convention
Energy values Integrated total (intermediate and end of period readings) are calculated for: – – – –
active energy negative active energy positive reactive energy capacitive reactive energy inductive
500CVD21 - 1KGT 150 912 V000 1 | 3
Figure 10: Phases directional overcurrent polarization
Neutral directional detection The neutral directional detection features control as phase element to discriminate faults between forward or reverse. This detection is also to select operation current (Io) to polarizing voltage (Vo) for the directional control factors.
Figure 11: Neutral directional voltage polarization
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Technical data
Stability
In addition to the RTU500 series general technical data, the following applies: Input channels
Stability
≤ 50 ppm/°C (Temperature range: -10 to +50°C)
Power supply input
Voltage
Measurement range: 0 ... 300 V AC
U1, U2, U3, UN
phase to neutral Input impedance: > 1 MΩ
Current
Current input channels: 24
I1, I2, I3, IN
Measurement range: –
5 A version: max. 6 A
–
1 A version: max. 1.2 A
–
Fault current inputs: 20 x IN
Load: < 0.1 VA per phase
Power supply voltage R012x (LO)
20... 60 VDC
Power supply voltage R014x (HI)
80… 260 V AC 80… 330 V DC
Power consumption
10 VA AC 5 W DC
Serial Ports Modbus RTU protocol
RS485 Distance: < 1.2 km
Overload withstand: –
3 x IN continuous
Diagnostic Port
RS232
–
25 x IN 2 sec
Baud Rate
Always configure 19.2 kbps
–
50 x IN 1 sec
Load
Up to 32 units loads
Frequency
45... 65 Hz
Samples
36 samples per cycle
Mechanical Layout
Harmonics
Up to 17th harmonic for 50/60 Hz
Dimensions
Data update interval
320 ms
250 mm x 160 mm x 65 (Width x Hight x Depth)
Housing type
Metal housing
Mounting
DIN rail mounting EN 50022 TS35: 35 mm x 15 mm or 35 mm x 7.5 mm
Binary outputs Supported binary output channels
1
Output technology
MOSFET
Switching voltage
200 V DC or AC
Maximum load
< 50 mA
Insulation tests Dielectric Strength IEC 60255-5
Accuracy Phase current I
0.2 %
Neutral current I
0.2 %
Phase current I, fault current
2%
Phase voltage U
0.2%
Phase to phase voltage U
0.2%
Active power (Watt)
0.5 %
Apparent power (VA)
0.5 %
Reactive power (Var)
0.5 %
Power factor (PF)
0.5 %
Frequency
0.05 %
AD converting
16 bit
2 kV AC rms, 1 minute
Immunity test IEC 61000-4-2
class III
IEC 61000-4-3
class III
Fast Transient / Burst IEC 61000-4-4
class III
Surge Immunity Test IEC 61000-4-5
class III
IEC 61000-4-12
class III
Environmental conditions Nominal operating temperature range:
-25 ... +70 °C
Start up:
-40 °C
Max. operating temperature, max.
+85 °C
96h: EN 60068-2-1, -2-2, -2-14 Relative humidity
5 ... 95 %
EN 60068-2-30
(non condensing)
Ordering information 500CVD21 R0121
1KGT030300R0121
500CVD21 - 1KGT 150 912 V000 1 | 5
Ordering information 500CVD21 R0125
1KGT030300R0125
500CVD21 R0141
1KGT030300R0141
500CVD21 R0145
1KGT030300R0145
Additional material Configuration kit for 560CVDxxx (Tool CD, cable) 560KCA01 R0001
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1KGT030800R0001
ABB AG Power Systems Division P.O. Box 10 03 51 68128 Mannheim, Germany
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