特高压变压器励磁涌流鉴别原理的研究

Study on Principle of Exciting Surge Current of UHV Transformer

变压器差动保护一直存在区分励磁涌流与内部故障电流的难题,1000kV特高压变压器保护也不例外。对特高压变压器进行的电磁暂态仿真及分析表明,最为传统的二次谐波制动方式在特高压变压器差动保护中的应用存在一定阻碍,而基于波形对称性的制动原理则可以在特高压变压器保护中较好的发挥作用。

There has been a problem of distinguishes exciting surge current and internal fault current in transformer differential protection,So does UHV transformer protection of 1000kV. Electromagnetic transient simulation and analysis for UHV transformer show that the most traditional second harmonic brake way has some block in UHV differental transformer protection. However, the brake principle based on waveform symmetry can be done well in the transformer.