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.
马俊岭, 厉志波. 基于序电压比值原理的电压互感器断线检测[J]. 电气技术, 2025, 26(4): 44-49.
MA Junling, LI Zhibo. Detection of potential transformer secondary break based on the principle of sequence voltage ratio. Electrical Engineering, 2025, 26(4): 44-49.