DEIF MVR-G257 Generator Differential Protection
MVR-G257
Generator Differential Protection
The MVR-G257 is a generator differential protectionrelay for large or critical synchronous generators. 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 9 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)
– Measuring accuracy can be calibrated to Class 0.2
– Differential Protection
Available Extension Cards:
– 8x digital inputs (programmable threshold voltage)
– 5x output relays
– Arc-Flash Protection – 4x sensor channels, 2x HSO1. 1x BI *)
– 8x RTD input
– 2x RJ45 100Mb Ethernet & IRIG-B *)
– 2x ST 100Mb Ethernet & IRIG-B *)
– 4x mA outputs – 1 x mA input
– 2x LC 100MB Ethernet (HSR, PRP redundant protocols)
– 2x RJ45 100MB Ethernet (HSR, PRP redundant protocols) *)
– RS-232 – Serial Fiber
Features
Protection Functions:
Sensitive) Earth fault protection stages INST, DT or IDMT (ANSI 50N/51N(S))
100% Stator Earth fault protection (ANSI 64F3)
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)
Inadvertent energizing (ANSI 50/27)
Loss of field (ANSI 40)
Machine thermal overload protection (ANSI 49M)
Motor or generator differential protection, 2-winding (ANSI 87M/G)
Over-excitation protection (ANSI 24)
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)
Restricted low-impedance earth fault protection (ANSI 87N)
Reverse-/under-/over-power protection INDT, DT or IDMT (ANSI 32)
Synchrocheck (ANSI 25)
Three-phase over-current protection INST, DT or IDMT (ANSI 50/51)
Under-impedance protection (ANSI 21)
Under-voltage protection INST, DT or IDMT (ANSI 27)
Vector jump/surge (ANSI 78)
Voltage controlled/dependent over-current protection (ANSI 51V)
Voltage memory