中国电力 ›› 2014, Vol. 47 ›› Issue (7): 67-70.DOI: 10.11930/j.issn.1004-9649.2014.7.67.3

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变压器复合电压闭锁过流保护灵敏度问题研究

李子峰   

  1. 神华国能宝清煤电化有限公司,黑龙江 宝清 155600
  • 收稿日期:2014-03-13 出版日期:2014-07-18 发布日期:2015-12-10
  • 作者简介:李子峰(1968—),男,硕士,高级工程师,高级技师,从事继电保护整定计算及试验研究工作。E-mail: zifengli1968@126.com

Study on the Sensitivity Problem of Transformer’s Over Current Protection Interlocked by Compound Voltage

LI Zi-feng   

  1. Shenhua Guoneng Energy Group Baoqing Coal Electricity Chemical Co., Ltd., 155600, China
  • Received:2014-03-13 Online:2014-07-18 Published:2015-12-10

摘要: 针对变压器复合电压闭锁过流保护灵敏度不足的问题,采用综合比较的分析方法,模拟不同参数变压器的运行状态、计算多种不同故障的短路电流、并结合变压器运行方式变化的因素,找出变压器复合电压闭锁过流保护灵敏度不足的若干原因,并提出在变压器高、中压侧加装相间阻抗保护 ,动作电流按躲过三相不平衡电流整定,采用不完全差动保护的解决方案。

关键词: 变压器, 短路阻抗, 过流保护, 短路计算, 灵敏度不足, 运行方式

Abstract: Based on the sensitivity problem of transformer’s over current protection interlocked by compound voltage, a comprehensive comparison analytical method is used to simulated the operating conditions of transformers with various parameters, to calculate the short currents of different types of power faults, and to find out the causes for the insufficient sensitivity of transformer’s over current protection interlocked by compound voltage according to the changes of transformer’s running mode, and some solutions are proposed. The method is proved to be comprehensive and practical.

Key words: transformer, short current resistance, over current protection, short current calculation, insufficient sensitivity, running mode

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