Ferroresonance mitigation method using active filter in Voltage Transformer (VT)

Azhar, Mohamad Azrul Nizar (2017) Ferroresonance mitigation method using active filter in Voltage Transformer (VT). Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Ferroresonance can be defined as a sudden overvoltage and overcurrent at a point of transient in the electrical power system in a short period of time. Ferroresonance in voltage transformer can occur due to lightning strike activities. Ferroresonance is difficult to analyze and the occurrence of ferroresonance phenomenon is unpredictable. Electrical equipment such as voltage transformer and capacitor voltage transformer that deals with ferroresonance phenomenon can cause serious damage to the equipment. The lightning strike can occur for a short period of time and caused ferroresonance happened which change transient character. The increasing level of lightning source cause the increasing of sudden overvoltage and also increase the number of transient cycles on the secondary side of the voltage transformer. The purpose of this research is to investigate and analyze the mitigation method which can be used to reduce the impact of ferroresonance on three-phase voltage transformer. The analysis of ferroresonance mitigation method using active filter in voltage transformer is conducted by using Power System Computer Aided Design (PSCAD) software. To run the simulation, all the factors that can cause the ferroresonance have to be identified first. The simulation is analyzed based on the voltage reading of the transformer. The passive filter and active shunt filter are used as the mitigation method in order to mitigate the ferroresonance effect on the voltage transformer. By using the passive filter on the voltage transformer can reduce the number of ferroresonance cycle, but the sudden voltage still remains higher while the active shunt filter can reduce the number of ferroresonance cycle better than passive filter. Besides that, it is also can decrease the peak transient voltage which can cause damage at the voltage transformer.

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