CT/VT Interface 560CVT10 The fault current is measured up to 20 times nominal current. Therefore the current inputs withstand 50 times nominal current for 1 s. The CT/VT interface is equipped with one binary output which can be used to indicate e.g. alarm for over current. All CT/VT interfaces are mounted in the RTU cabinet. Current and voltage inputs are connected via transformer only (see Figure 1). The CT/VT interfaces are designed for mounting on DIN rails 35 mm. Application The Current/Voltage Transducer Interface (CT/VT interface) is used for measuring analog AC input signals from three independent phases with 3 or 4 wire connections. For each phase voltage, current and power are measured directly, and a number of other parameters derived from these in software. The results are transmitted to the RTU560. There are several versions available: Auxiliary Voltage (LO): 3 current-, 3 voltage inputs (I n 1A) 3 current-, 3 voltage inputs (I n 5A) 4 current-, 4 voltage inputs (I n 1A) 4 current-, 4 voltage inputs (I n 5A) Auxiliary Voltage (HI): 4 current-, 4 voltage inputs (I n 1A) 4 current-, 4 voltage inputs (I n 5A) Characteristics The CT/VT interface is a microprocessorbased Intelligent Electronic Device (IED) intended for current, voltage, power and energy measurement. Distorted input waveforms with harmonics to the 15th are therefore detected accurately. Additional functionality to provide functions as fault current detection, minimum and maximum logging and analog high and low limit supervision is available. Meter Operation The following metered parameters are available: Instantaneous Meter Values Measured by true RMS conversion and transmission to the RTU560 of following values: Phase - Neutral Voltage 1N, 2N, 3N, Average Phase -Phase Voltage 1-2, 2-3, 3-1, Average Current Phase 1, 2, 3 Fault Current Phase 1, 2, 3, N Active Power, Phase 1, 2, 3, Total Reactive Power, Phase 1, 2, 3, Total Apparent Power, Phase 1, 2, 3, Total Power Factor, Phase 1, 2, 3, Average Frequency, Phase Rotation Voltage / Current Harmonic Distortion (THD, current and voltage phase 1,2 and 3) Derived Meter Values calculation of Active, Apparent and Reactive Energy accumulated values (intermediate and end of period readings, delivery and consumption) calculation of Ampere Hours accumulated values (intermediate and end of period readings, delivery and consumption) Neutral current (with 3 wire connection) Doc-No.: 1KGT 150 623 V001 1 1
Functionalities With a powerful diagnostic tool the operator is able to fulfil below described tasks. As option the related date can be transferred over the communication link to the RTU and the control system. Harmonic analysis for power quality analysis (up to 15th harmonic): Communications over RS485 port with Modbus RTU Protocol User Mapping to speed up communication Logging of Minimum and Maximum Values Relay output for configurable alarm Configurable alarms for over voltage, over frequency, over current and so on Fault current detection (Option) - configurable flexcurve for overcurrent alarm (in the same as IEC, ANSI curves) Event Logging Trend logging (option) Waveform Capturing and phaser analysis: - 2 Doc.-No.: 1KGT 150 623 V001 1
Wiring Fig. 1: 3 phase with 3 wire connection Fig. 2: 3 phase with 4 wire connection Doc-No.: 1KGT 150 623 V001 1 3
Technical Data In addition to the RTU560 general data, the following applies: Input Channels Voltage U 1, U 2, U 3, U 4 Current I 1, I 2, I 3, I 4 Frequency Samples Range: 10... 300V AC 3 Phase, 3 or 4 Wire Load : <0.15 VA at 300V U n : - R001x: 3 voltages (U 1, U 2, U 3 ) - R002x, R004x: 4 voltages (U 1, U 2, U 3, U 4 ) R00x5: 5A, max. 6A R00x1: 1A, max. 1.2A Fault current: 20 x In Load: <0.2VA per phase Overload withstand: -2 x In continuous -25 x In 2 s -50 x In 1 s I n : - R001x: 3 current (I 1, I 2, I 3 ) - R002x, R004x: 4 current (I 1, I 2, I 3, I 4 ) 40... 70Hz 32 samples per cycle Stability Stability Serial Ports Modbus RTU protocol Diagnostic Port Baud Rate Test Voltage Dielectric Strength IEC 255-5 Immunity Test ANSI / IEEE C37.90.1-1989 IEC 61000-4-12 Fast Transient / Burst IEC 61000-4-4 max. 100ppm/ C (Temperature range -10 to +50 C) RS485 RS232 1.2k, 2.4k, 4.8k, 9.6k, 19.2k bps 2kV AC rms, 1 minute 3 kv SWC Class III SWC Class IV SWC Accuracy Phase I 0.2 % Surge Immunity Test IEC 61000-4-5 Class IV Impulse Neutral I 0.5 % Phase I, fault current 1 % Phase U 0.2% Auxiliary voltage Auxiliary Voltage (LO) 24/ 48 V DC ±15% Ph-Ph U 0.2% Watts 0.5 % VA 0.5 % Vars 0.5 % PF 0.5 % Auxiliary Voltage (HI) 80 260 V AC 80 330 V DC Frequency AD converting 0.05 % rd 12 bit + sign bit 4 Doc.-No.: 1KGT 150 623 V001 1
Mechanical Layout Ordering information Width Height Depth Height Enclosure 134.8 mm 70.3 mm 149.5 mm 70.3 mm for DIN Rail 35 mm Environmental Conditions Tempera- Operating ture -25 to +60 ºC Storage Temperature -40 to +80 ºC Relative humidity 10 95 % non condensing 560CVT10 R00011 In = 1A, 3 voltage, 3 560CVT10 R00015 In = 5A, 3 voltage, 3 560 CVT10 R0021 I n = 1A, 4 voltage, 4 560 CVT10 R0025 I n = 5A, 4 voltage, 4 560 CVT10 R0041 I n = 1A, 4 voltage, 4 current, Version HI 560 CVT10 R0045 I n = 5A, 4 voltage, 4 current, Version HI R0011 R0015 R0021 R0025 R0041 R0045 Doc-No.: 1KGT 150 623 V001 1 5
Note: We reserve the right to make technical changes or modify the con-tents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB AG 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 AG. Copyright 2011 ABB All rights reserved 6 Doc.-No.: 1KGT 150 623 V001 1