Protection relays
DEIF manufactures a comprehensive range of tested Multiple protection & single-function protection relays. The microprocessor-based, protection integrate maximum protection functionalities as standard and confirms to various global standards..
Protection relays
Medium Voltage Relay MVR-200 series
- Three phase overcurrent protection stages INST, DT or IDMT
- (Sensitive) Earth-fault protection stages INST, DT or IDMT
- Harmonic overcurrent protection / inrush blocking stages INST, DT or IDMT
- Cold-load pick-up block
- Current unbalance / broken conductor protection stages INST, DT or IDMT
- Thermal overload protection (line)
- Restricted earth fault protection (low-imp)
- Cable-end differential protection
- Directional three-phase overcurrent protection stages DT or IDMT
- Directional (sensitive) residual overcurrent protection stages DT or IDMT
- Intermittent earth fault
- Fault locator
- Overvoltage protection stages INST, DT or IDMT
- Undervoltage protection stages INST, DT or IDMT
- Positive sequence under/overvoltage protection stages INST, DT or IDMT
- Residual voltage protection stages INST, DT or IDMT
- Frequency protection stages
- Rate of change of frequency
- Vector Jump / surge
- Reverse/under/over power protection stages INST, DT or IDMT
- Synchrocheck
- Auto-reclose
- Fuse failure
- Current transformer supervision
- Switch onto fault logic
- Breaker failure protection
- Programmable stage
Loss of mains relay LMR-122D
- Vector shift and df/dt (ROCOF)
- Detection of vector shift
- ANSI code 78
- Mains disconnection on mains failure
- Ensures no asynchronous reconnection
- LED indication of fault condition
- LED indication for activated relay
- 35 mm DIN rail or base mounting
Current relay RMC-131D
- Differential current relay
- ANSI code 87
- Measurement of 3-phase currents
- Non-stabilised measurement
- LED indication of fault condition
- Timer-controlled tripping
- LED indication for activated relay
- Extra change-over relay contact for signalling
- 35 mm DIN rail or base mounting
Voltage relay RMV-112D
- Under- and over-voltage.
- U>: 100 to 120 %, U<: 80 to 100 %.
- Under-voltage/over-voltage (U< + U>)
- ANSI code 27 and 59
- 3-phase measurement
- LED indication of fault condition
- Timer-controlled tripping
- LED indication for activated relay
- 35 mm DIN rail or base mounting
Voltage relay RMV-122D
- Over-voltage (double).
- U>: 100 to 120 %,U>: 100 to 120 %.
- Under-voltage/over-voltage (U< + U>)
- ANSI code 27 and 59
- 3-phase measurement
- LED indication of fault condition
- Timer-controlled tripping
- LED indication for activated relay
- 35 mm DIN rail or base mounting
Voltage relay RMV-132D
- Under-voltage (double).
- U<: 80 to 100 %, U<: 80 to 100 %.
- Under-voltage/over-voltage (U< + U>)
- ANSI code 27 and 59
- 3-phase measurement
- LED indication of fault condition
- Timer-controlled tripping
- LED indication for activated relay
- 35 mm DIN rail or base mounting
Voltage relay RMV-142D
- Under- and Over-voltage.
- U>: 100 to 120 %, U<: 80 to 100 %.
- Single phase measurement.
- Under-voltage/over-voltage (U< + U>)
- ANSI code 27 and 59
- 3-phase measurement
- LED indication of fault condition
- Timer-controlled tripping
- LED indication for activated relay
- 35 mm DIN rail or base mounting
Multi-differential relay MDR-2
- Short response time (70 ms)
- 3-phase current detection on both generator sides
- Active adjustment of non-balanced current measurements
- Measuring accuracy 1 %
- Display indicator for all measurements
- DIN rail or base mounting with remote mountable display