|
|
|
| Detection of potential transformer secondary break based on the principle of sequence voltage ratio |
| MA Junling1, LI Zhibo2 |
1. China Resources New Energy Investment Co., Ltd He’nan Branch, Zhengzhou 450018;
2. Run-dian Energy Science and Technology Co., Ltd, Zhengzhou 450018 |
|
|
|
|
Abstract Based on the fault characteristics following the disconnection of the secondary circuit of a potential transformer (PT), a detection method for PT secondary break utilizing the principle of sequence voltage ratio is proposed. This method primarily calculates the ratio of the positive sequence voltage to the negative sequence voltage from the PT’s secondary voltage data to determine the occurrence of a PT break. Simulation results demonstrate that this criterion can accurately assess whether an asymmetric disconnection has occurred in the PT secondary circuit, particularly advantageous when the PT secondary circuit is concurrently connected to both delta and star loads.
|
|
Received: 08 October 2024
|
|
|
|
| Cite this article: |
|
MA Junling,LI Zhibo. Detection of potential transformer secondary break based on the principle of sequence voltage ratio[J]. Electrical Engineering, 2025, 26(4): 44-49.
|
|
|
|
| URL: |
|
https://dqjs.cesmedia.cn/EN/Y2025/V26/I4/44
|
[1] 彭家琦, 冶海平, 戴强, 等. 一起高海拔35kV电容式电压互感器故障浅析[J].电气技术, 2019, 20(2): 111-114.
[2] 刘东超, 李铁仲, 张哲, 等. PT中性线断线的研究[J].电力系统保护与控制, 2010, 38(5): 73-76.
[3] 陈莉, 张瑞明, 宋莉莉. 一起35kV电容式电压互感器二次电压异常分析[J].电气技术, 2021, 22(2): 59-62.
[4] 王祺元, 靳巩磊, 康婧婧, 等. 高压直流输电工程换流变进线电压互感器断线故障分析[J].电气技术, 2023, 24(5): 71-75.
[5] 张建华. 发电机出口电压互感器匝间短路分析及在线监测装置设计[J].电气技术, 2020, 21(2): 110-113, 128.
[6] 沈泽亮, 汪金刚, 王谦, 等. 一种基于低频窄带扫描的电磁式电压互感器杂散电容测量与精确建模方法[J].电工技术学报, 2023, 38(8): 2211-2221.
[7] 张明凯. 220kV母线PT断线告警的案例分析[J].电子技术, 2024, 53(9): 110-111.
[8] 陈琦, 陈福锋, 唐治国, 等. 多间隔信息融合的母线保护电流互感器断线再开放策略[J].电力自动化设备, 2024, 44(5): 151-157.
[9] 林撒迦. 一起110kV电压互感器二次回路N线断线故障分析[J].电气技术与经济, 2024(3): 278-280.
[10] 邓得政, 赵若阳. 电压互感器二次断线对三相三线计量的影响分析[J].电气技术, 2020, 21(5): 98-102.
[11] 张帅, 肖兰, 梁博, 等. 500kV变电站不同电压等级线路PT断线的原理分析及研究[J].电气技术与经济, 2023(1): 32-35, 44.
[12] 张旭俊. 关于三相电压不平衡时负序电压的计算[J].华中电力, 1994(6): 12-16.
[13] 肖楚鹏, 贾秀芳, 邱泽晶, 等. 基于细分迭代法的负序电压责任分摊计算[J].华北电力大学学报(自然科学版), 2017, 44(2): 75-82.
[14] 马建伟, 付同福, 郁金松, 等. 预防合闸事故的PT断线逻辑的分析及改进[J].电工技术, 2023(10): 193-196.
[15] 黄少锋, 李欧, 费彬, 等. 开口三角绕组任意连接的电压互感器断线闭锁新方法[J].电力自动化设备, 2015, 35(7): 59-64. |
|
|
|
2025, Vol. 26 
