DEIF MVR-T256 Transformer Differential Protection

The MVR-T256 transformer protection device is an easy-to-use differential protection

relay with high I/O capacity.

The MVR-T256 transformer protection device is an easy-to-use differential protection

relay providing overcurrent protection for both low-voltage and high-voltage side of

the transformer, earth fault protection, negative sequence overcurrent protection

as well as two independent instances of restricted earth fault protection.

The I/O capacity can be customized to the applications needs by 10 available

extension slots.

10x Current input (configurable 0.2…10A)

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 & Ed2. 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

- 10 extension slots for additional hardware options

- Event recorder (up to 15 000 events)

- Disturbance recorder (up to 100 disturbance records)

- 2nd and 5th harmonic blocking.

- Automatic verification for the connection group and nominal value settings.

- Overloading and through fault statistics for preventive maintenance.

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))

• 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)

• Harmonic over-current protection/inrush blocking stages INST, DT or IDMT (ANSI

50H/51H/68)

• Programmable stage (ANSI 99)

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

• Switch onto fault logic (SOTF)

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

• Transformer thermal overload protection (ANSI 49T)

• Transformer, motor or generator differential protection, 2 winding (ANSI 87T/G/M)