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
| Overcurrent Protection | 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) |
| Voltage Protection | 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) |
| Frequency Protection | 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) |
| Motor Protection | 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) |
| Additional Protection: | Voltage Memory Programmable Stage: PGx>/< (99) Arc Protection (Optional): IArc>/I0Arc> (50Arc/50NArc) |
| Control | Number of objects to control and monitor: 10 Number of indicators to monitor: 10 Number of setting groups: 8 |
| Measuring and Monitoring | 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) |
| Hardware | 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) |
| Communication Input | 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 61850 (edition 2) IEC 60870-5-101/104 IEC 60870-5-103 Modbus/RTU and Modbus/TCP DNP3 SPA |
AQ-M255 MOTOR PROTECTION DEVICE Application
