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作 者:田湘贵 张鹏 罗义晖 欧俊延 夏武 Tian Xianggui;Zhang Peng;Luo Yihui;Ou Junyan;Xia Wu(China Southern Power Grid Co.LTD.Ultra high voltage transmission Company Liuzhou Bureau,Liuzhou Guangxi,545000)
机构地区:[1]中国南方电网有限责任公司超高压输电公司柳州局,广西柳州545000
出 处:《电子测试》2022年第14期111-113,共3页Electronic Test
摘 要:某变电站开展线路融冰试验时,阻抗保护误动,致融冰装置移相闭锁。通过分析融冰控保系统阻抗保护动作逻辑及故障录波波形,判断阻抗保护误动原因为阻抗保护定值整定不合理。此后根据阻抗保护原理分析计算得为避免在极端工况下阻抗保护误动,阻抗保护定值k2的取值范围应在1.3-1.7之间。由于阻抗保护功能主要是对线路出现断线进行保护,而对于线路断线以直流过压为主保护,并考虑到阻抗保护定值设定相对复杂,容易受到环境影响导致保护误动,因此建议可选择将阻抗保护退出。During the line ice melting test in a substation,the impedance protection misacted,causing phase shift blocking of the ice melting device.By analyzing the action logic of the impedance protection of the melting ice control protection system and the fault record wave form,the reason of the misoperation of the impedance protection is judged to be the unreasonable setting of the constant value of the impedance protection.After that,according to the analysis and calculation of impedance protection principle,in order to avoid the misoperation of impedance protection under extreme conditions,the constant value K2 of impedance protection should be within the range of 1.3-1.7.Since the function of impedance protection is mainly to protect the line when it breaks,and dc overvoltage is the main protection for the line break,and considering that the setting value of impedance protection is relatively complex,which is easy to be affected by the environment and lead to protection misoperation,it is suggested that the impedance protection can be quit.
分 类 号:TM75[电气工程—电力系统及自动化]
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