电流回路多点接地对变压器差动保护的影响

The Influence of Multiple Earthing of Current Circuit on Differential Protection of Transformers

通过现场具体实例,以大量的实测数据作佐证,详细地论证了主变差动电流回路多点接地形成的原因,并对其造成变压器差动保护误动的过程做出分析,辅以试验验证,提出解决问题的措施,并强调了差动保护TA回路1点接地及接地点选择的重要意义,对现场工作具有现实指导价值。

By instantiation and a large amout of measured data, this paper illustrates the formation of the multiple earthing of the difference current circuit of the main transformer and also analyses its consequent result-the malfunction process of transformer＇s differential protection. It also provides proof tests and suggestive solvements. Finally, it stresses the importance of single point earthing of the differential protection TA circuit and so is the site selection of earthing contact, which is of great practial guiding value to the on the spot work, multiple earthing of the differential protection TA circuit;malfunction of differential protection; analysis