Structure
Static relay consists of following units for operation:
- Auxiliary Voltage Supply:24 V DC supply is required for energizing the circuitry of the static relay. This is obtained by converting 230 V AC to 24 V DC and in some cases station battery voltage of 110 V to 24 V DC.
- Comprator:It compares the actual quantity with the pre-set quantity. For example in an over-current relay it will compare the actual current supplied by CT with the pre-determined set current over which tripping is required.
- Time delay Elements:The required operation time is achieved here by adjusting the values of R and C.
- Logic Circuit:By using the gate circuits conditions of operation of relays are set and relay can only be operated when these conditions are satisfied.
- Output Device:The actual tripping of relay can be achieved by firing the SCR or operating the attracted armature type relay by feeding the signal coming from logic circuit output.
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