变压器油温加速的反时限过电流保护方法  

Inverse Time Over-current Protection Method for Transformer Oil Temperature Acceleration

作　　者：黄景光[1] 梅诺男 李浙栋 赵珩 孙佳航 HUANG Jingguang;MEI Nuonan;LI Zhedong;ZHAO Heng;SUN Jiahang(College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,China;Shaoxing Power Supply Company,State Grid Zhejiang Electric Power Co.,Ltd.,Shaoxing 312000,China)

机构地区：[1]三峡大学电气与新能源学院,宜昌443002 [2]国网浙江省电力有限公司绍兴供电公司,绍兴312000

出　　处：《电力系统及其自动化学报》2024年第10期33-39,48,共8页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(52107095)。

摘　　要：针对当变压器处于重负荷且变压器油温达到报警温度其内部发生轻微故障时,传统反时限过电流保护不动作或动作时间过长的情况,提出一种变压器油温加速反时限过电流保护的新原理及其优化整定方法。首先,引入变压器油温因子和加速指数对反时限特性曲线进行修正;然后,根据反时限保护动作时限配合关系建立数学模型进行优化整定。最后,基于现有理论分析和仿真验证结果,得出所提新方案能够在保证选择性和可靠性的前提下有效提高保护的速动性和灵敏性。When a transformer is under heavy load and its oil temperature reaches the alarm value,the traditional inverse time over-current protection does not operate or the action time is too long under a minor internal fault of the transformer.To solve this problem,a novel principle of inverse time over-current protection for transformer oil temperature acceleration and the corresponding optimization and setting method are proposed.Firstly,the transformer oil temperature factor and acceleration index are introduced to modify the inverse time characteristic curve.Secondly,a mathematical model based on the coordination relationship of the inverse time protection action time limit is established for optimization and setting.Finally,based on the existing theoretical analysis and simulation verification results,it is shown that the proposed novel scheme can effectively improve the rapidity and sensitivity of protection based on the promise that the selectivity and reliability are ensured.

关 键 词：变压器轻微故障 反时限过电流保护 变压器油温因子 油温加速指数 参数优化整定 

分 类 号：TM771[电气工程—电力系统及自动化]