Study On Reliablity Of Residual Current Device

Being a type of new low-voltage safe apparatus, the residual current device(RCD) is used to avoid the electric shock and the fire accident. For the residual current protector that is related to the people's life and estate, the study on the reliability of RCD is very important for the people and sociality.The study of reliability of RCD was introduced in this paper. The reliability of RCD mainly check on its work characteristic and the mode of the failure. The RCD belongs to the protector that operates infrequently. The RCD has three failure modes the reject-operation, the wrong-operation and the malfunction of handle. The reliability check should consider this characteristic and these failure modes. The success ratio R and the failure ratio A are applied as reliability criterion of RCD. And their estimate methods were put forward. According to the sample theory, applied the time terminated test plan, the reliability compliance test plan was brought forward. The reliability compliance test plan was divided into two parts, residual current protection test and operation reliability test. In this paper, the test plan, the failure criterion and the program of reliability test were introduced.In order to do the reliability compliance test, the reliability test equipment was designed. Using this equipment, the residual current protection test and operation reliability test can be done.This project has relation with "The Reliability Test Device of RCD" of ChangShu switch factory and Suzhou New & Hi-tech Industrial Development Zone Inspection & Test Institute for Electrical Equipment.