不同故障下特高压换流变压器差动保护动作特性分析
发布时间：2019-08-14 09:58
【摘要】：换流变压器作为高压直流输电系统中重要的电气设备,其继电保护对保障系统安全运行有着非常重要的作用。目前,变压器大多采用基于二次谐波制动的差动保护闭锁方案。特高压直流输电系统中换流器的非线性导致换流变压器和普通电力变压器差动保护存在差异。通过构建相应的短路电流流通路径,研究了换流变压器差动电流在区内单相接地短路故障、区内相间短路故障以及整流侧阀短路故障情况下的特点。研究结果表明,换流变发生区外故障时差动保护不会误动,但换流变发生区内故障时差动保护可能拒动。
[Abstract]:As an important electrical equipment in HVDC transmission system, relay protection of converter transformer plays a very important role in ensuring the safe operation of the system. At present, most transformers use differential protection locking scheme based on second harmonic braking. The nonlinear converter in UHVDC system leads to the difference between converter transformer and ordinary power transformer differential protection. By constructing the corresponding short-circuit current flow path, the characteristics of differential current of converter transformer in the case of single-phase grounding short-circuit fault, interphase short-circuit fault and rectifier side valve short-circuit fault are studied. The results show that the differential protection will not misoperate when the flow change occurs outside the zone, but the differential protection may refuse to move when the flow change occurs in the zone.
【作者单位】： 国网浙江省电力公司;国网浙江省电力公司检修分公司;新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600)~~
【分类号】：TM774
[Abstract]:As an important electrical equipment in HVDC transmission system, relay protection of converter transformer plays a very important role in ensuring the safe operation of the system. At present, most transformers use differential protection locking scheme based on second harmonic braking. The nonlinear converter in UHVDC system leads to the difference between converter transformer and ordinary power transformer differential protection. By constructing the corresponding short-circuit current flow path, the characteristics of differential current of converter transformer in the case of single-phase grounding short-circuit fault, interphase short-circuit fault and rectifier side valve short-circuit fault are studied. The results show that the differential protection will not misoperate when the flow change occurs outside the zone, but the differential protection may refuse to move when the flow change occurs in the zone.
【作者单位】： 国网浙江省电力公司;国网浙江省电力公司检修分公司;新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600)~~
【分类号】：TM774
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