Reliability compliance test of over-load protective relay

Over-load protective relay is widely applied in electric control system.Its reliability directly affects running of system.Reliability compliance test is an important approach for improving reliability of products.On the basis of adopting protective success ratio as reliability characteristic value,limited timing or limited number truncated test is chosen.Sampling and checking plan is designed.The test contents,the failure criterion and test program of reliability compliance test are determined.In addition,the reliability compliance test for typical products is carried out.