Remote Terminal Units - Data sheet Multimeter 500CVD21 RTU500 series CT/VT interface with 4 voltage and 24 current inputs for direct monitoring of 3/4 wire 0 300 V AC (line to earth), 0...500 V AC (phase to phase) 1A / 5A from AC transformers Serial interface to RTU500 (RS-485) Fault current detection (FCD), directional information, 20 In LO power supply: 24...60 V DC HI power supply: 80...330 V AC, 80...260 V DC 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 500CVD21 R0125 500CVD21 R0141 500CVD21 R0145 1A 5A 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 6: Current inputs with 3 CT per feeder, 3I (Ia, Ib, Ic) Figure 2: Voltage input with 2 voltage transformers (3P3W3U) Figure 3: Voltage input with 3 voltage transformers (3P4W3U) Figure 7: Current inputs with 4 CT per feeder, 4I (Ia, Ib, Ic, I0) Figure 4: Voltage input with 4 voltage transformers (3P4W4U) 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. Instantaneous Meter Values Following values are measured by true RMS conversion Figure 5: Current inputs with 2 CT per feeder, 2I (Ia, Ic) Measurement Measuring Path Neutral voltage Phase 1-N, 2-N, 3-N Voltage N, Voltage line unbalance Phase voltage Phase 1-2, 2-3, 1-3 Current Phase 1, 2, 3, N, Unbalance Fault current Phase 1, 2, 3, N Active power (Watt)
Measurement Measuring Path Reactive power (Var) Apparent power (VA) Power factor (PF) PF = cos phi + high bit set for leading load (high bit 0 for lagging load) Phase angle Frequency System Phase rotation Positive/ negative sequence The Multimeter supports 4 quadrant power values. Directional overcurrent Detection Directional overcurrent detection is for the protection of multiple source feeders to distinguish between faults in different directions. The function is required to detect fault locations in networks with multiple feeders and for closed ring structures. 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 overcurrent detection discriminates faults in forward or reverse direction. Parameter name Phase time overcurrent torque angle Default Parameter location 30 (for inductive faulted load) CVD device parameter General value range: -45, -30, -15, 0, 15, 30, 45, 60, 75, 90 Characteristic angle of maimum torque (MTA) between operating current and polarizing voltage in the non-faulted system. 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 Voltage / Current Distortion (THD) 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) for: U1, U2, U3, UN I1, I2, I3, IN Figure 10: Phases directional overcurrent polarization Neutral directional detection The neutral directional detection feature discriminates faults in forward or reverse direction. Parameter name Fault current detection The device supports over current detection with three phases and one neutral line. The configuration of the time current characteristics requires following control variables: trip time delay curve, curve multiplier, pickup current and reset timing. The trip curve reference follows ANSI, IEEE, IEC standards (ANSI C37.90, IEEE C37.112-1996, IEC 255-4, BF412). Default Neutral time overcurrent 30 torque angle Parameter location CVD device parameter General value range: -45, -30, -15, 0, 15, 30, 45, 60, 75, 90 Characteristic angle of maimum torque (MTA) between operating current I0 and polarizing voltage V0 in the non-faulted system. Mostly the setting adopts -45 (45 lag) in neutral ground, -15 ~ 0 ~ 15 for impedance or compensated ground, 75 ~ 90 for isolated ground.
Figure 11: Neutral directional voltage polarization
Technical data In addition to the RTU500 series general technical data, the following applies: Stability Stability 50 ppm/ C (Temperature range: -10 to +50 C) Input channels Voltage U1, U2, U3, UN Measurement range: 0... 300 V AC phase to neutral Input impedance: > 1 MΩ Current I1, I2, I3, IN Current input channels: 24 Measurement range: 5 A version: ma. 6 A 1 A version: ma. 1.2 A Fault current inputs: 20 IN Power supply input Power supply voltage R012 (LO) 20... 60 VDC Power supply voltage R014 (HI) 80 260 V AC Power consumption 10 VA AC 5 W DC Load: < 0.1 VA per phase Signaling by LEDs Overload withstand: Run 3 IN continuous 25 IN 2 sec 50 IN 1 sec 80 330 V DC Normal operation: Flashing with 1 Hz Error: not flashing with 1 Hz R/T Receiving/Transmission from/to the I/O bus Frequency 45... 65 Hz Samples 36 samples per cycle Harmonics Up to 17th harmonic for 50/60 Hz Serial Ports Data update interval 320 ms Modbus RTU protocol RS485 Distance: < 150 m Diagnostic Port RS232 Baud Rate Always configure 19.2 kbps Load Up to 32 units loads Binary outputs Supported binary output channels 1 Output technology MOSFET Mechanical Layout Switching voltage 200 V DC or AC Dimensions Maimum load < 50 ma 250 mm 160 mm 65 (Width Height Depth) Housing type Metal housing Mounting DIN rail mounting EN 50022 TS35: 35 mm 15 mm or 35 mm 7.5 mm 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) Immunity test Apparent power (VA) IEC 61000-4-2 Reactive power (Var) IEC 61000-4-3 Power factor (PF) Frequency 0.05 % Fast Transient / Burst IEC 61000-4-4 AD converting 16 bit Insulation tests Dielectric Strength IEC 60255-5 2 kv AC rms, 1 minute Surge Immunity Test IEC 61000-4-5 IEC 61000-4-12
Environmental conditions Nominal operating temperature range Start up Ma. operating temperature, ma. 96h -25 C... 70 C -40 C +85 C EN 60068-2-1, -2-2, -2-14 Relative humidity EN 60068-2-30 5... 95 % (non condensing) Ordering information 500CVD21 R0121 1KGT030300R0121 1A, LO 500CVD21 R0125 1KGT030300R0125 5A, LO 500CVD21 R0141 1KGT030300R0141 1A, HI 500CVD21 R0145 1KGT030300R0145 5A, HI Additional material Configuration kit for 560CVD (Tool CD, cable) 1KGT030800R0001 ABB AG Power Grids P.O. Bo 10 03 51 68128 Mannheim, Germany Tel. +49 621 381-3000 www.abb.com/remote-terminal-units We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB AB does not accept any responsibility whatsoever for potential errors or possible lack of information in this document. We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or utilization of its contents in whole or in parts is forbidden without prior written consent of ABB AB. Copyright 2018 ABB All rights reserved 1KGT 150 912 V001 1 560KCA01 R0001