MAIN PROCEDURES AND METHOD TO ANALYZE MALOPERATION OF PROTECTIVE RELAYING

On the actual experience from protective relaying testing, the problem that whether the testing results of protective relayings for 220kV and above power system are believable is researched. The steps and methods to analyze the incorrect action of protective relayings after the failures occurred, the items to be prepared before the tests are conducted and the contents which should pay special attention to during the tests are expounded.