Protection of Impedance-Matching Balance Traction Transformer Based on Transformer Model
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摘要: 为解决励磁涌流的识别问题,将基于变压器模型的保护原理应用于阻抗匹配平衡牵引变压器.根据对该类变压器的电磁特性分析,导出了电压平衡方程,通过分析电压平衡方程等号两边的差值可以确定保护动作.在此基础上,提出了基于变压器模型的阻抗匹配平衡变压器保护的动作特性和动作方程;考虑电流互感器、电压互感器和保护装置自身的误差,提出了相应的整定原则.最后,进行了数值仿真,以验证动作方程和整定原则的正确性.Abstract: To identify inrush currents and short-circuit currents caused by internal faults,the transformer protection principle based on the transformer model was used for impedance-matching balance traction transformers(IMBT).By analyzing the electromagnetic characteristics of IMBT,voltage balance equations were derived.As a result,protective actions can be decided by analyzing the difference between the two sides of the voltage balance equations.The action characteristic and action formula for the protection of IMBT were obtained,and the setting principles were put forward by considering errors from current transformer,voltage transformer and protection sets.Finally,a numerical simulation was carried out to show the validity of the action characteristic and protective principles.
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