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.
Read more about this topic: Static Relay
Famous quotes containing the word structure:
“Who says that fictions only and false hair
Become a verse? Is there in truth no beauty?
Is all good structure in a winding stair?
May no lines pass, except they do their duty
Not to a true, but painted chair?”
—George Herbert (1593–1633)
“Agnosticism is a perfectly respectable and tenable philosophical position; it is not dogmatic and makes no pronouncements about the ultimate truths of the universe. It remains open to evidence and persuasion; lacking faith, it nevertheless does not deride faith. Atheism, on the other hand, is as unyielding and dogmatic about religious belief as true believers are about heathens. It tries to use reason to demolish a structure that is not built upon reason.”
—Sydney J. Harris (1917–1986)
“Women over fifty already form one of the largest groups in the population structure of the western world. As long as they like themselves, they will not be an oppressed minority. In order to like themselves they must reject trivialization by others of who and what they are. A grown woman should not have to masquerade as a girl in order to remain in the land of the living.”
—Germaine Greer (b. 1939)