Transformer protection debugging system and method based on analog quantity self-switching

CN122218359APending Publication Date: 2026-06-16STATE GRID JIBEI ELECTRIC POWER CO LTD TANGSHAN POWER SUPPLY CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID JIBEI ELECTRIC POWER CO LTD TANGSHAN POWER SUPPLY CO
Filing Date
2026-03-31
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

The existing portable relay protection tester has an insufficient number of analog output channels, which cannot meet the access requirements of multiple sides and multiple circuits of the main transformer protection. This leads to frequent manual line replacement, which is inefficient and unsafe. In addition, the existing expansion equipment lacks a hardware interlocking mechanism, which poses a risk of blind switching.

Method used

By introducing an analog output switching device in conjunction with host computer debugging software, one-time wiring and fully automatic testing of analog circuits can be achieved. Through a dual hardware and software interlocking mechanism and a global safety state machine, safe and reliable signal routing switching is ensured.

Benefits of technology

It has achieved automation and safety in the main transformer protection test, shortened the commissioning cycle, reduced the risk of human error, improved test efficiency and accuracy, and met the high safety standards of the power grid.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a main transformer protection debugging system and method based on analog quantity self-switching, and aims to solve the low efficiency and blind cutting safety hazards caused by the insufficient existing test channels and frequent manual line changing. The system comprises host computer debugging software, a portable relay protection tester and an analog quantity output switching device. The host computer debugging software generates a test sequence based on a channel mapping relationship and performs timing anti-collision scheduling; the tester takes over the bottom layer control right and forcibly executes soft and hard double locking before output; the switching device executes physical switching according to the tester instruction and injects a direct current micro-ampere level constant current source into the target path for blind cutting prevention self-checking, and returns a ready signal to the tester to unlock the output after verifying that there is no abnormality. The application realizes one-time wiring, automatic routing and closed-loop verification of main transformer protection multi-side testing, solves the live blind cutting and cross short circuit risk from the bottom layer physical level, and improves the safety and efficiency of the intelligent debugging of the transformer substation.
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