Affect Of Current Transducer Saturation To Differential Protection And Its Solution

Current transformer(CT) is an important current measure element in power systerm,especially in relay protection,which need accurate current measurement in fault state.But because of the saturation of ct,relay always cannot act correctly,especially in differential protection.This passage analyze an in correct action of differential protection,then found the reason of the in correct action is ct saturation.then,the passage analyze the factor s lead to ct saturation.and give some solution to solve the problem.Optical current transducer is brand new kind of current transformer.it has a lot of merit which traditonal ct cannot compare with.the passage describe the development of OCT and its principle.then give an method which use OCT to replace traditional ct to solve the problem of ct saturation .