Current transformer secondary circuit electrification warning unit and device

By designing a live warning unit for the secondary circuit of a current transformer, the current is collected by a clamp-on current transformer and converted into DC for alarm purposes. This solves the problem of misoperation during maintenance of the secondary circuit of the current transformer, ensuring the safety of equipment and personnel.

CN224399498UActive Publication Date: 2026-06-23THREE GORGES JINSHAJIANG CHUANYUN HYDROPOWER DEV CO LTD
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Patent Information

Application Number
CN202521580945.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-07-28
Publication Date
2026-06-23
Estimated Expiration
2035-07-28

AI Technical Summary

Technical Problem

In existing technologies, the insulating tape on the secondary circuit of current transformers is prone to falling off or has an ineffective warning effect during maintenance, leading to misoperation by maintenance personnel and causing equipment burnout or personal injury accidents.

Method used

Design a live warning unit for the secondary circuit of a current transformer, including an AC current acquisition unit, a load resistor, a rectifier and filter unit, and an alarm unit. The current is acquired through a clamp-on current transformer, converted into DC current, and then the alarm unit provides an audible and visual alarm to ensure that maintenance personnel are aware of the live status.

Benefits of technology

This effectively reminds maintenance personnel that the secondary side of the current transformer is energized, preventing misoperation and ensuring equipment and personal safety.

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Abstract

The utility model discloses a current transformer secondary circuit electrification warning unit and device. The current transformer secondary circuit electrification warning unit comprises an alternating current collection part, a load resistor, a rectification filtering part and an alarm part. The alternating current acquisition part is connected with the load resistor, two ends of the load resistor are connected with the rectification filtering part, and the rectification filtering part is connected with the alarm part; according to the scheme, the split core type current transformer is clamped on the secondary lead of the current transformer, the output end of the split core type current transformer is connected to the two ends of the load resistor respectively, the two ends of the load resistor are connected to the rectification filtering module respectively, and the output end of the rectification filtering module is connected to the LED driving module, so that a red LED lamp and / or a buzzer can be lightened under the condition that the secondary circuit of the current transformer is electrified; and therefore, an electrified warning and reminding effect can be achieved.
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