A residual current monitoring method and device for a low-voltage AC power supply system of a station

By setting a rotating positioning frame with moving and fixed contacts on the connecting plate, multiple current transformers can be connected to the negative pole together and the positive pole can be switched independently one by one. This solves the problems of signal crosstalk and hardware cost, improves monitoring accuracy and anti-interference ability, and ensures equipment safety and automated reliability of detection.

CN122410106APending Publication Date: 2026-07-17JIANGXI HONGTAI ELECTRIC POWER IND & TRADE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGXI HONGTAI ELECTRIC POWER IND & TRADE CO LTD
Filing Date
2026-05-12
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In the existing technology, the parallel connection of multiple current transformers causes signal crosstalk, which reduces the accuracy of monitoring results and anti-interference ability, and increases hardware cost and wiring complexity. It cannot effectively solve the problem of interference-free switching between the short circuit of the positive terminal of the current transformer in the non-monitoring state and the independent lead-out structure in the monitoring state.

Method used

By setting a rotating positioning frame with moving and fixed contacts on the connecting plate, multiple current transformers can be connected to the negative pole together and the positive pole can be switched independently one by one. The unidirectional meshing of the multi-tooth ratchet and the ratchet locks the position of the connecting shaft. Combined with the automatic reset mechanism of the tension spring and the locking pin, the stability and safety of the detection process are ensured.

Benefits of technology

It enables time-division sequential monitoring of multiple current transformers, avoids signal crosstalk, improves the accuracy and anti-interference capability of residual current monitoring, reduces hardware costs and operational complexity, and ensures equipment safety and automated reliability of detection.

✦ Generated by Eureka AI based on patent content.

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    Figure CN122410106A_ABST
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Abstract

The application relates to power system safety monitoring technology and discloses a residual current monitoring device for a station low-voltage alternating current power supply system, which comprises a mounting table, transformers, a connecting shaft and a connecting ring. A sliding groove is arranged on the mounting table, a plurality of transformers are arranged in sliding mode along the sliding groove, the connecting ring is fixedly arranged on the rear side of the mounting table, the connecting shaft is rotatably arranged in the middle part of the mounting table, the end part of the connecting shaft is provided with a connecting disc, the connecting disc is provided with a normally closed contact, a short-circuit sliding ring is coaxially arranged on one side of the connecting ring, the normally closed contact is in sliding contact and electric connection with the short-circuit sliding ring, the negative poles of the transformers are all in electric connection with the short-circuit sliding ring, and a movable contact piece is further arranged on the connecting disc. The movable contact piece is used for sequentially actuating the fixed contact pieces, the positioning frame is forced to rotate, the positive pole of the transformer is separated from the fixed pole piece of the common short circuit, and is simultaneously in close contact and electric connection with the movable contact piece, the function of the common connection of the negative poles of the multiple transformers and the independent switching of the positive poles is realized, and one set of detection circuit can be used for sequentially monitoring multiple circuits.
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