DEIF MVR-T257 Transformer Protection Device

The MVR-T257 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 9 available extension slots. It can be equipped with

a automatic voltage regulation for one or more transformers in parallel.

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 & 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

- 9 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.

- Measuring accuracy can be calibrated to Class 0.2

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)

• 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)

• Over-excitation protection (ANSI 24)

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

• 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)

• Switch onto fault logic (SOTF)

• Synchrocheck (ANSI 25)

• 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)

• Under-impedance protection (ANSI 21)

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

• Voltage memory