Ground fault monitoring method, monitoring device and fault indicator for power distribution lines
By analyzing the historical and current transient signals of power distribution lines using the Proni algorithm, the changing trends of the main harmonic frequency and attenuation factor are extracted. This solves the problems of insufficient ground fault monitoring accuracy and poor anti-interference in existing technologies, and achieves high-precision ground fault type identification.
CN116559724BActive Publication Date: 2026-06-09QUJING POWER SUPPLY BUREAU YUNNAN POWER GRID CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- QUJING POWER SUPPLY BUREAU YUNNAN POWER GRID CO LTD
- Filing Date
- 2023-05-31
- Publication Date
- 2026-06-09
AI Technical Summary
Technical Problem
Existing ground fault monitoring methods lack accuracy and have poor anti-interference capabilities, making it impossible to effectively determine the insulation status of power distribution lines to ground.
Method used
The Proni algorithm is used to analyze historical and current fault transient signals, extract the changing trends of the main harmonic frequency and attenuation factor, and determine the ground fault type by matching the characteristic parameters of historical and current signals.
Benefits of technology
It achieves high-precision and anti-interference grounding fault monitoring, can accurately determine changes in the insulation status of power distribution lines, and improves the reliability and economy of the power system.
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Smart Images
Figure CN116559724B_ABST
Abstract
The application provides a power distribution line ground fault monitoring method, a monitoring device and a fault indicator. The method comprises the following steps: acquiring a plurality of historical fault transient signals; calculating a plurality of first change trends by using the Prony algorithm according to the historical fault transient signals, wherein the first change trend comprises the change trend of the main harmonic frequency and the attenuation factor of the power distribution line in a historical time period; acquiring a current fault transient signal, wherein the current fault transient signal is a current signal recorded by the fault indicator in a target time period; calculating a second change trend by using the Prony algorithm according to the current fault transient signal, wherein the second change trend comprises the change trend of the main harmonic frequency and the attenuation factor of the power distribution line in the target time period; and determining the ground fault type of the power distribution line according to the first change trend and the second change trend. The method solves the problems of insufficient accuracy and poor anti-interference performance of the ground fault monitoring method in the prior art.
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