AQ-C255A Capacitor bank protection device
Home Protection relays Capacitor bank protection AQ-C255A Capacitor bank protection device
Description
The AQ-C255A capacitor bank protection device has been specifically designed for the protection of capacitor banks. It includes capacitor bank current unbalance, capacitor bank neutral unbalance, and overload protections in addition to the standard overcurrent, earth fault and voltage protections. AQ-C255A offers a modular protection and control solution for applications that require a large I/O capacity. You can add up to eleven (11) I/O or communication modules into the device for extensive monitoring and control applications. The AQ-C255A capacitor bank protection device communicates using various protocols, including the IEC 61850 substation communication standard.
Highlights:
Double busbar control.
A large I/O capacity.
Capacitor bank module with capacitor bank-specific protection functions.
Current- and voltage-based protections.
Cable-end differential protection.
Low-impedance restricted earth fault protection.
Harmonics protection and control.
Power and energy measurement accuracy of up to 0.2 %.
Up to 100 disturbance records.
See all AQ-C255 variants
Technical data
Capacitor bank module (CBP)
Capacitor bank current unbalance (Iuc>; 46C)
Capacitor bank neutral unbalance protection (Cnu>; 50UB)
Capacitor bank overload protection (Icol>; 49OL)
Non-directional overcurrent (I>; 50/51) - 4 stages (INST, DT or IDMT)
Non-directional earth fault (I0>; 50N/51N) - 4 stages (INST, DT or IDMT)
Directional overcurrent (Idir>; 67) - 4 stages (INST, DT or IDMT)
Directional earth fault (I0dir>; 67N/32N) - 4 stages (INST, DT or IDMT)
Intermittent earth fault (I0int>; 67NT)
Negative sequence overcurrent/ Phase current reversal/ Current unbalance (I2>; 46/46R/46L) - 4 stages (INST, DT or IDMT)
Harmonic overcurrent (Ih>; 50H/51H/68H) - 4 stages (INST, DT or IDMT)
Non-directional undercurrent (I<; 37)
Circuit breaker failure protection (CBFP; 50BF/52BF)
High-impedance or low-impedance restricted earth fault/ Cable end differential (I0d>; 87N)
Overvoltage (U>; 59) - 4 stages (INST, DT or IDMT)
Undervoltage (U<; 27) - 4 stages (INST, DT or IDMT)
Neutral overvoltage (U0>; 59N) - 4 stages (INST, DT or IDMT)
Sequence voltage (U1/U2>/<; 47/27P/59PN) - 4 stages (INST, DT or IDMT)
Overfrequency and underfrequency (f>/<; 81O/81U) - 8 stages (INST or DT)
Rate-of-change of frequency (df/dt>/<; 81R) - 1 stage (DT)
Power protection (P, Q, S>/<; 32) - 4 stages (DT)
Resistance temperature detectors (RTD)
Line thermal overload (TF>; 49F)
Voltage memory
Programmable stage (PGx>/<; 99)
Arc protection (IArc>/I0Arc>; 50Arc/50NArc) (optional)
Number of objects to control and monitor: 10
Number of indicators to monitor: 10
Number of setting groups: 8
Cold load pick-up
Switch-on-to-fault
Phase, sequence and residual currents (IL1, IL2, IL3, I01, I02)
Phase, sequence and residual voltages (UL1, UL2, UL3, U12, U23, U31, U0)
Frequency (f)
Power (P, Q, S, pf) and Energy (E+, E-, Eq+, Eq-)
Power and energy class 0.5
Power and energy measurement accuracy of up to 0.2 % (optional)
Current transformer supervision
Voltage transformer supervision (60)
Circuit breaker wear monitoring
Total harmonic distortion (current)
Total harmonic distortion (voltage)
Measurement recorder
Measurement value recorder
Event recorder (max. 15 000 permanent event records)
Disturbance recorder (max. 100 records á 5 seconds at 3.2 kHz sampling)
Current inputs: 5
Voltage inputs: 4
Digital inputs (fixed): 3
Digital outputs (fixed): 5
Number of empty slots: 11
Digital inputs: +8/16/24/32/40/48/56/64/72/80/88 (optional)
Digital outputs: +5/10/15/20/25/30 (optional)
Milliampere I/O module (4 mA outputs + 1 mA input) (optional)
Arc protection module (4 sensors + 2 HSO + 1 BI) (optional)
Communication media (see "Communication" below)
External I/O modules (see "Accessories" below)
Communication inputs
RJ-45 100 Mbps Ethernet (front panel, fixed)
RJ-45 100 Mbps Ethernet and RS-485 (rear panel, fixed)
Double RJ-45 Ethernet & IRIG-B communication module (optional)
Double ST Ethernet & IRIG-B communication module (optional)
Double LC (HSR/PRP) Ethernet communication module (optional)
RS-232 & serial fiber communication module (optional)
Communication protocols
IEC 61850 (edition 1)
IEC 60870-5-101/104
IEC 60870-5-103
Modbus/RTU and Modbus/TCP
DNP3
SPA
AX007 External 6-channel 2-/3-wire RTD input module (pre-configured)
AX008 External 8-channel thermocouple and mA input module (pre-configured)
AX013 Raising frame (120 mm)
AX014 Raising frame (40 mm)
AX015 Wall mounting bracket
Download
AQ 200 series flyer, v2.01 (English)
AQ 200 series flyer, v2.01 (Finnish)
AQ 200 series flyer, v2.01 (Swedish)
AQ 200 series product catalog (ANSI, v2.03, EN, September 2024)
AQ 200 series product catalog (IEC, v2.03, EN, September 2024)
AQtivate PRO flyer, v1.00 (English)
AQtivate PRO flyer, v1.00 (Finnish)
