Rishabh Instruments Limited | Rish Relay 252-PSx

Rish Relay 252-PSx - Phase Balance Relay

The protector de-energizes a relay should any one of the above faults occur. It is fitted with an adjustable time delay to eliminate premature operation on short-duration supply fluctuations. A red LED indicates that the supply is within limits & that the output relay is energized.

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Adjustable set point
Adjustable time delay
LED trip indication
2 pole relay contacts
Internal Differential
Auto Reset

Principle of Operation

The protector comprises monitoring circuits for voltage phase reversal and phase unbalance. Outputs from these circuits are fed to a comparator, which changes state under fault conditions.

When the comparator trips, the output relay will de-energize after a preset time delay, & the red LED will then no longer be lit.

The relay and LED will automatically energize again when all the supply parameters have returned to safe and acceptable limits.

Applications

The phase unbalance feature will protect motors of any size against:

Excessive temperature rise due to unbalanced supplies ( e.g. a 10% unbalanced supply can increase the temperature rise by 150%)

The regenerated voltage is generated during a single-phase failure when running at a low load.

Portable pumps

Portable compressors

Motors - Single Phasing

Gensets - correct engine rotation

All portable equipment

All rotating machines

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