method of maettning foer detection of stroemtransformatorer and detector foer genomfoerande of naemnda method

摘要

A Method and a detector for detecting saturation in current transformers (1) based on the following criteria: ¦I(t)¦ K1, ¦d(I(t))/dt¦ K2, ¦I(t- tau )¦ K3, I(t) is the low-pass filtered current of the current transformer and K1, K2, K3 and tau are constants of predetermined values. If all three conditions are fulfilled, the current transformer is saturated. IMAGE