Review on Common Faults of Electromagnetic Potential Transformers and the Countermeasures

As a widely used equipment in power systems, potential transformers are closely correlated with the security and stability of power systems. It is of great significance to study the effective measures to deal with the faults of potential transformers to ensure the normal operation of power systems. In this paper, the electromagnetic potential transformers commonly used in power systems were selected as the research object. First, the fault mechanism and harm of ferroresonance, secondary multi-grounding, wire broken and wrong wiring of potential transformers were analyzed in detail. Then, the basic principle of the ferroresonance elimination measures which has been widely used in practice was introduced in detail, and their advantages and disadvantages were deeply analyzed. And on this basis, this paper introduces that how to improve the traditional measures and the flexible ferroresonance elimination methods to adapt the complex situation better. Finally, the countermeasures of multi-grounding, wire broken and wrong wiring were briefly introduced. Through the detailed review of various solutions at the present stage, it can provide some reference for the future research on countermeasures to the faults of potential transformer.