Rishabh Instruments Limited | Rish Relay 256-PLx

Rish Relay 256-PLx - Synchro-check Relay

The Synchro-check relay can be used to assist in the semiautomatic paralleling of two AC power systems. The Rishabh Paralleling protector provides manual/automatic switching of the generator to the busbar without damage or disturbance to the system.

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LED trip indication
Two pole relay contacts (optional)
Adjustable synchronizing set points
Live and Dead bus versions

Principle of operation

MODEL 256 - PLL

The relay continuously monitors the voltage, phase displacement, and frequency of two supplies. A single set point adjustment permits the selection of suitable matching, and a red LED illuminates when the relay is energized, indicating that the two supplies are well matched and it is safe to close the breaker.

MODEL 256 - PLD

This version operates in the same way as model 256-PLL but includes an additional dead bus detection function. If there is a requirement for a continuous supply or emergency power, then the generator can be connected without synchronizing, thus ensuring continuity of supply. The absence of bus voltage will cause the relay to energize.

The relay provides one pair of normally open and one pair of normally closed contacts. An LED indicates a relay-energized state. The synchronizing set point limits are user-adjustable.

Applications

Co-generation
Generator sets
Gen-Bus synchronizing
Bus-Bus synchronizing
Assists in manual synchronizing
Monitors auto-synchronizing systems

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