MVR-T257

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

*) Land based applications only. Not marine approved

Marine approvals
- DNV/GL
- Lloyds Registeres LR
- Bureau Vertias BR
- ABS (USA)
- CCS (China)
- CNK (Japan)
- IEC (Israel)
- KR (Korea)
- UKCA (UK)
- RINA (Italy)