Feature of AQ-M255 MOTOR PROTECTION DEVICE
- Powerful motor management with a large I/O capacity.
- Five (5) thermal models (time constant accurate).
- Soft start protection beginning from 6 Hz.
- Wye-delta started motor supervision.
- Two-speed motor protection.
- Optional power and energy measurement accuracy of up to 0.2 %.
- Asynchronous and synchronous motors.
Specification of AQ-M255 MOTOR PROTECTION DEVICE
- 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)
- 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)
- 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)
- Over frequency and under frequency (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)
- Machine thermal overload (TM>; 49M)
- Motor status monitoring
- Motor start/ Locked rotor monitoring (Ist>; 48/14)
- Frequent start (N>; 66)
- Non-directional undercurrent (I<; 37)
- Mechanical jam (Im>; 51M)
- Power factor protection (PF<; 55)
- 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
- 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)
- Running hour counter
- 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)
- Arc protection module (4 sensors + 2 HSO + 1 BI)
- Communication media (see “Communication” below)
- External I/O modules (see “Accessories” below)
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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)
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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
