AQ-V211 Voltage protection device


The AQ-V211 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 five (5) I/O or communication cards. All this makes AQ-V211 optimal for demanding load shedding and automatic transfer applications. AQ-V211 communicates using various protocols, including the IEC 61850 substation communication standard.

The AQ-V211 voltage protection device comes in two variants: the “A” variant (AQ-V211A) includes the standard functionalities for voltage protection, while the “B” variant (AQ-V211B) also includes the synchronizer function.


  • Eight (8) frequency stages and eight (8) setting groups for load shedding.
  • Synchrocheck for up to three (3) circuit breakers.
  • Optional synchronizer function.
  • 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, DT or IDMT)
  • Resistance temperature detectors (RTD)
  • Voltage memory
  • Programmable stage (PGx>/<; 99)

  • Number of objects to control and monitor: 5
  • Number of indicators to monitor: 5
  • Number of setting groups: 8
  • Switch-on-to-fault
  • Vector jump (Δφ; 78)
  • Synchrocheck (ΔV/Δa/Δf; 25)
  • AQ-V211B – Synchronizer (ΔV/Δa/Δf; 25)

  • Phase, sequence and residual voltages (UL1, UL2, UL3, U12, U23, U31, U0)
  • 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: 5
  • Digital inputs: +8/16/24/32/40 (optional)
  • Digital outputs: +5/10 (optional)
  • Milliampere I/O module (4 mA outputs + 1 mA input)
  • 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)
  • 2 x RJ-45 100 Mbps Ethernet with an IRIG-B input (optional)
  • 2 x ST 100 Mbps Ethernet with an IRIG-B input (optional)
  • 2 x LC 100 Mbps Ethernet (PRP/HSR) (optional)
  • RS-232 serial fiber (PP/PG/GP/GG) (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)
  • AX009 Raising frame (87 mm)
  • AX010 Raising frame (40 mm)
  • AX011 Combiflex frame
  • AX012 Wall mounting bracket

Additional material

Application Drawing

An application image for AQ-V211 voltage protection device, with one version drawn according to IEC standard symbols and the other according to IEEE/ANSI standard symbols.

Device Rear Image

Device rear image_AQ-211-AAAAA

Device and Cut-out Image

AQ-210 dimensions and cut-out

Order Code

Order code_V211x

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