Analysis of Abnormal Secondary Voltage Phenomenon in Electromagnetic Voltage Transformers
There are a large number of electromagnetic voltage transformers operating in ungrounded systems of power plants and substations below 35 kV.When the electrical parameters of the primary system are asymmetric and the characteristics of the voltage transformers are inconsistent,it can lead to significant voltage imbalance on the secondary side of the voltage transformers.The unreasonable grounding method of the primary neutral point of the voltage transformer can also have a direct impact on the secondary voltage,and there may be high-order harmonic components.These abnormal voltage levels will have an impact on the implementation of secondary side user equipment protection,voltage regulation,etc.This article focuses on discussing the impact of these factors on the secondary side voltage of voltage transformers.
electromagnetic voltage transformervoltage imbalancethird harmonic
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