A physical simulation method for PT / CT secondary circuit insulation anomaly monitoring

By combining physical simulation methods with high-precision sensors, the problem of detecting insulation anomalies in the secondary circuit of PT/CT was solved, enabling efficient and accurate judgment of insulation faults, reducing manpower and material consumption, and improving detection efficiency.

CN119986288BActive Publication Date: 2026-05-01YUNNAN POWER GRID CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
YUNNAN POWER GRID CO LTD
Filing Date
2025-04-17
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

In existing technologies, the secondary AC circuit of PT/CT suffers from an increase in defects such as multiple grounding, short circuits, and open circuits due to insulation issues, leading to a higher probability of incorrect relay protection operation. Furthermore, existing methods are difficult to effectively detect insulation abnormalities during operation, consume a lot of manpower and resources, and lack an effective physical simulation platform.

Method used

Using physical simulation, a high-precision current transformer and load regulation are set up to simulate the insulation fault of the N-phase secondary side of the PT. The waveform similarity analysis of the Hausdorff distance is used to determine the grounding situation. Combined with high-precision sensors, data feature analysis is performed to achieve accurate location of insulation anomalies.

Benefits of technology

It achieves efficient detection of insulation abnormalities in the secondary circuit of PT/CT, reduces manpower and material consumption, improves detection efficiency, and can accurately identify insulation faults during operation, thus reducing the problem of inaccurate fault branch location in traditional methods.

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Abstract

The application discloses a kind of physical simulation methods for PT / CT secondary circuit insulation anomaly monitoring, it is related to electric variable measurement technical field, including, setting two groups PT, and setting test point and the measurement system of high-precision current transformer, the insulation fault of two points ground of PT secondary side N phase is analyzed;Through distribution area to power supply simulation system and connect load, make system load operation;Load is adjusted into three-phase unbalanced mode, so that the secondary side of double-winding transformer T2 ABC three-phase current is unbalanced, and measurement and judgment are carried out;Output final judgment result.The application adopts waveform similarity analysis method based on Hausdorff distance when carrying out current measurement and data feature analysis, can accurately locate the fault branch when PT / CT secondary ac circuit occurs multiple points.
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Citation Information

Patent Citations

  • Substation domain current transformer secondary circuit fault detection method and device

    CN113093085A

  • Voltage transformer secondary circuit fault on-line monitoring method and fault positioning device

    CN118151050A