Fault Detection of Electrical Equipment. ...

This paper presents an application's experience of Low voltage impulse testing (LVI-testing), some results of the use of Frequency Response Analysis (FRA) to check the condition of transformer windings and infra-red control (IR-control) results of electrical equipment. The LVI method and short-circuit inductive reactance measurements are sensitive for detecting such faults as radial, axial winding deformations, a twisting of low-voltage or regulating windings, a losing of winding's pressing and other. IR-control was used for detection of overheating of disconnector contacts, bushing condition of power transformers, condition of circuit breakers, arresters and limiters of overvoltages, coupling transformers, measuring current transformers, measuring voltage transformers and other. Information-measuring systems (IMS), which described in this paper, were proposed to use together with rapid digital protection against short-circuit regimes in transformer windings.