Protection relays are an important component of any electrical power system. They act as a safety net by detecting and isolating faults in the system to prevent any damage to equipment and protect the safety of personnel. Regular testing is necessary to ensure that protection relays are functioning correctly. One effective testing method is secondary injection testing. Protection relays are an important component of any electrical power system. They act as a safety net by detecting and isolating faults in the system to prevent any damage to equipment and protect the safety of personnel. Regular testing is necessary to ensure that protection relays are functioning correctly. One effective testing method is secondary injection testing.
Please follow up below directions when performing the test of Protection Relays By Secondary Injection;
1. The Testing Engineer should provide the commissioning manuals and have a detailed understanding of the testing and commissioning procedure.
2. All outputs/indications to be tested.
3. Initial tests of new protective relays must include operating characteristics checks for a representative range of available settings with company-approved computer-operated test equipment running routines developed for the specific relay and test set involved.
4. Relay auxiliary devices such as external resistors, metrosils, etc. to be tested to conform to required ratings and manufacturer's information.
5. Final calibration test of all protective relays must be carried out on approved settings, by secondary
injection at the front panel mounted test facilities.
6. Auxiliary and tripping relay testing shall include,
7. Pickup and dropout voltage, verification of all contacts.
8. Operation timing at 80% and 100% nominal voltage.
9. Time delay relays shall be tested at 0%, set point, and 100% delay.
10. Use of red and green tags for tested relays, meters, etc.
11. All the relays and meters that have been tested and found o.k must have green tags
12. The relays and meters found defective during tests should be tagged red.