Ground fault identification method and electronic device suitable for direct current transmission line

By combining multi-dimensional information analysis, the problem of ground fault identification in flexible DC transmission systems has been solved, enabling rapid and accurate identification of ground faults and ensuring the safe and stable operation of the power grid.

CN122109907APending Publication Date: 2026-05-29CYG SUNRI CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CYG SUNRI CO LTD
Filing Date
2026-01-22
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In existing flexible DC transmission systems, traditional protection methods struggle to quickly and accurately identify grounding faults via transition resistors during grounding faults, increasing the risk of damage to power electronic devices.

Method used

By combining multi-dimensional information such as initial fault initiation, current surge characteristic analysis, fault impedance and voltage drop mode analysis, a comprehensive discrimination result is generated to identify ground faults, including current surge characteristic analysis, fault impedance calculation and voltage drop mode analysis.

Benefits of technology

It improves the ability to identify and accurately determine ground faults, ensuring the safe and stable operation of the power grid under fault conditions and avoiding damage to power electronic devices.

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Abstract

The application relates to the technical field of power system relay protection, in particular to a grounding fault identification method suitable for a DC transmission line and an electronic device. The method comprises the following steps: when an initial fault starting condition is met, a current time is recorded as a starting time. Based on the DC line current collected from the starting time, current mutation characteristic analysis is carried out to generate a first type of discrimination result. Fault impedance calculation is carried out to generate a second type of discrimination result, and the second type of discrimination result at least comprises a first sub-result representing whether a grounding fault condition is met and a second sub-result representing whether a low-impedance grounding fault condition is met. Voltage drop pattern analysis is carried out to generate a third type of discrimination result. According to the first type of discrimination result and the first sub-result, in combination with at least one of the second sub-result and the third type of discrimination result, a grounding fault identification result is output. The application can improve the identification ability of grounding faults and complex faults and improve the accuracy of fault discrimination.
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