The effect of short circuit fault on one winding to other windings in FRA

Abstract

Monitoring and diagnosis of power transformer in power systems have been examined and debated significantly in last few decades. Recently, more researchers have expressed their interest in these issues as the utilities and network operators operating under a rising cost-effecting pressure. Especially, in studying to monitor winding faults which is found to be the most common fault within transformers. This paper addresses the issue of the effect of inter-windings short circuit fault in a Dyn11 connected transformer. The specific aim is to study the effect of fault at winding of other phases to the response of measured phase. Frequency Response Analysis (FRA) which is discovered to be a powerful and sensitive method to examine and evaluate the condition, including the mechanical reliability of the transformer windings is used.

The effect of short circuit fault in three-phase core-typed transformer

“…Similar trend can be seen on the second transformer as shown in Figure 12(b). These results verify the initial finding in [1]. Table 3 shows the summary of the results obtained.…”

“…Frequency response analysis (FRA) is found to be the best method to monitor the transformer reliability. This paper presents a continuation of study presented in previous paper [1]. The study performed a laboratory test to show that the response of a normal winding phase A can be affected by short circuit fault which occurred at LV winding phase a, b, and c. To further investigate, current paper performed FRA measurement and applied fault on all phases.…”

“…Equation (1) shows that the amount of flux, is directly proportional to the product of the number of turns, N and the current flow in the winding, I. In general, the internal SC leads to reduction of the electrical length of the winding, meaning reduction of N [20].…”

An Interpretable AI Approach for Machine Fault DiagnosisUsing Dynamic Gradient LRP and Guided Grad-CAM withThermography

“…12: Sample Dataset Induction Motor [29] Fig. 13: Similar transformer used for experiment prone to faults according to studies [50], as illustrated in Figure 7. The transformer can be short-circuited under load conditions, as shown in Figure 14, as observed from study [52].…”

Comparative study of electrical test methods on detecting transformer faults

“…Transformers are subjected to thermal, mechanical, and electrical stresses throughout their lifetime. Studies have identified that transformer failures frequently occur in windings (49.4%), tap changers (23%), bushings (13%), lead exits (6.4%), cores (3.7%), and others (3.9%) [1], [2]. Failure of a transformer component will result in significant financial losses because the transformer will be out of service for extended periods, and this includes the cost of repair or replacement.…”