AQ-V251 Voltage protection device
Home Protection relays Voltage protection AQ-V251 Voltage protection device
Description
The AQ-V251x voltage protection device offers a modular voltage protection solution for substations. The relay includes both voltage and frequency protections as well as powerful logic programming, and you can add up to eleven (11) I/O or communication cards. All this makes AQ-V251x optimal for demanding load shedding and automatic transfer applications that require a large I/O capacity. AQ-V251x voltage protection device communicates using various protocols, including the IEC 61850 substation communication standard.
The AQ-V251x comes in two variants: AQ-V251A has all the I/O capacity and protections, while AQ-V251B also includes the synchronizer control function.
Highlights:
A large I/O capacity.
Eight (8) frequency stages and eight (8) setting groups for load shedding.
Synchrocheck for up to three (3) circuit breakers.
Anti-islanding protection.
Technical data
Circuit breaker failure protection (CBFP; 50BF/52BF)
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) - 8 stages (INST or DT)
Resistance temperature detectors (RTD)
Voltage memory
Programmable stage (PGx>/<; 99)
Number of objects to control and monitor: 10
Number of indicators to monitor: 10
Number of setting groups: 8
Switch-on-to-fault
Vector jump (Δφ; 78)
Synchrocheck (ΔV/Δa/Δf; 25)
Number of objects to control and monitor: 10
Number of indicators to monitor: 10
Number of setting groups: 8
Switch-on-to-fault
Vector jump (Δφ; 78)
Synchrocheck (ΔV/Δa/Δf; 25)
Synchronizer (ΔV/Δa/Δf; 25)
Phase, sequence and residual voltages (UL1, UL2, UL3, UL12, UL23, UL31, U0)
Frequency (f)
Voltage transformer supervision (60)
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)
Voltage inputs: 4
Digital inputs (fixed): 3
Digital outputs (fixed): 5
Number of empty slots: 13
Digital inputs: +8/16/24/32/40/48/56/64/72/80/88 (optional)
Digital outputs: +5/10/15/20/25/30 (optional)
High-speed high-current output module (optional)
Milliampere I/O module (4 mA inputs + 1 mA output) (optional)
Milliampere I/O module (4 mA outputs + 1 mA input) (optional)
RTD input module (8 RTD inputs) (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 SFP Ethernet & IRIG-B communication module (optional)
Double LC (HSR/PRP) Ethernet communication module (optional)
Double RJ-45 (HSR/PRP) Ethernet communication module (optional)
RS-232 & serial fiber communication module (optional)
Communication protocols
IEC 61850 (edition 1)
IEC 61850 (edition 2)
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
