Grounding state detection method, device and equipment of power transmission line, medium and product

By performing harmonic analysis on the steady-state voltage signal of the transmission line and injecting a test current at a preset frequency, the problems of low detection accuracy and misjudgment in the existing technology are solved, realizing high-precision grounding status detection and ensuring the accuracy and safety of the detection results.

CN122218562APending Publication Date: 2026-06-16GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-10
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing methods for detecting the grounding status of transmission lines suffer from low detection accuracy and the risk of misjudgment, failing to meet the safety requirements for high-reliability operation. This is mainly due to the high internal resistance of the voltage transformer and the distributed impedance of the line connected in series in the measurement circuit, which leads to a severe voltage drop in the injected signal and the submersion of the small grounding impedance signal.

Method used

Harmonic analysis is performed by acquiring the steady-state voltage signal on the secondary side of the voltage transformer to obtain the harmonic distortion index. After determining whether the preset conditions are met, a test current signal of a preset frequency is injected. The response current and voltage of the grounding device are acquired, the grounding impedance is calculated and compared with a preset threshold to determine the grounding status.

Benefits of technology

It improves the accuracy of grounding status detection of transmission lines, avoids ineffective or easily interfered active injection under suspended conditions, ensures that the measurement results directly reflect the grounding impedance characteristics, and achieves high-precision grounding status determination.

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Abstract

The application discloses a grounding state detection method, device, equipment, medium and product of a power transmission line, comprising the following steps: collecting a steady-state voltage signal of a secondary side of a voltage transformer connected to a first end of a to-be-detected line; performing harmonic analysis on the steady-state voltage signal to obtain a harmonic distortion index of the steady-state voltage signal; if the harmonic distortion index meets a preset condition, injecting a test current signal under a preset frequency into the first end of the to-be-detected line, collecting a response current flowing through a grounding device and a response voltage across the grounding device, calculating a grounding impedance of the grounding device based on the response voltage and the response current, comparing the grounding impedance with a preset grounding threshold to obtain a comparison result, and determining a grounding state of the to-be-detected line based on the comparison result and a preset grounding rule, wherein the grounding device is connected to an end of the to-be-detected line. The application can improve the accuracy of grounding state detection of the power transmission line.
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