DEIF MVR-M257 Motor Protection

The MVR-M257 is a motor protection and control solution for large or critical

synchronous and asynchronous motors. It provides voltage and current

based protection functions including differential protection and measurement

of all vital values to be supervised. Furthermore it can connect up to 16 RTD

sensors for thermal alarms and tripping. It comes with 11 avaialable extension

slots to extend the device with additional communication interfaces and I/Os.

10x Current input (configurable 0.2…10A)

4x Voltage input (1.00…480.00V (RMS)

3x Digital input

5x Output relay (4NO, 1CO)

1x IRF output (1CO)

2x Remote com port (1 x RJ45 Ethernet and 1 x RS-485)

- IEC 61850 Ed1. Modbus TCP/RTU, IEC 60870-5-104/103/101. DNP 3.0. SPA protocols

- DT, IEC or ANSI time/overcurrent curves with settable release delays

- 9 extension slots for additional hardware options

- Event recorder (up to 15 000 events)

- Disturbance recorder (up to 100 disturbance records)

- supports 5 thermal models (time constant accurate)

- soft-start protection starts at 6Hz

- Wye-delta started motor supervision

- two-speed motor protection

- Measuring accuracy can be calibrated to Class 0.2

- Differential Protection

- Synchronous or asynchronous motors

Features

Protection Functions:

• Underspeed (ANSI 14)

• (Sensitive) Earth fault protection stages INST, DT or IDMT (ANSI 50N/51N(S))

• Auto-reclose (ANSI 79)

• Breaker failure protection (ANSI 50BF)

• Cable-end differential protection (ANSI 87)

• Current transformer supervision (ANSI 60L)

• Current unbalance/broken conductor protection stages INST, DT or IDMT (ANSI 46 /R/L)

• Directional (sensitive) residual over-current protection stages DT or IDMT (ANSI 67N)

• Directional three-phase over-current protection stages DT or IDMT (ANSI 67)

• Frequency protection stages (ANSI 81O/U)

• Fuse failure (ANSI 60)

• Harmonic over-current protection/inrush blocking stages INST, DT or IDMT (ANSI 50H/51H/68)

• Load jam monitor (ANSI 51M)

• Machine thermal overload protection (ANSI 49M)

• Motor or generator differential protection, 2-winding (ANSI 87M/G)

• Motor start-up supervision element (ANSI 48)

• Overvoltage protection INST, DT or IDMT (ANSI 59)

• Positive/negative sequence under-/over-voltage protection INST, DT or IDMT (ANSI 27P/47/59P)

• Power factor (ANSI 55)

• Programmable stage (ANSI 99)

• Rate of Change of Frequency ROCOF (ANSI 81R)

• Residual voltage protection INST, DT or IDMT (ANSI 59N)

• Restart inhibit/frequent starts (ANSI 66)

• Restricted low-impedance earth fault protection (ANSI 87N)

• Reverse-/under-/over-power protection INDT, DT or IDMT (ANSI 32)

• Three-phase over-current protection INST, DT or IDMT (ANSI 50/51)

• Under-current monitor (ANSI 37)

• Under-voltage protection INST, DT or IDMT (ANSI 27)

• Voltage memory