Electric leakage test circuit, electric leakage protection circuit and electric leakage circuit breaker
By introducing diode D15 into the test circuit and optimizing the leakage signal processing circuit, the leakage current problem caused by high voltage was solved, the accuracy of leakage detection and the safety of the circuit were improved, and the design of the current transformer was simplified.
Patent Information
- Application Number
- CN202520130907.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-03-27
- Estimated Expiration
- 2035-01-20
AI Technical Summary
In the prior art, the high voltage on the test circuit detection winding TA2 causes leakage current, which affects the accuracy of the residual current detection winding TA1 in detecting leakage current, and increases the size of the transformer and the difficulty of the manufacturing process.
A diode D15 is introduced into the test circuit of the residual current transformer to prevent current backflow. Combined with the design of the leakage current signal processing circuit and the windings TA1 and TA2 of the residual current transformer, the current is ensured to flow in the predetermined direction to avoid the generation of leakage current.
It achieves accuracy and safety in leakage current detection, avoids unnecessary leakage current, ensures the reliability of test results and circuit safety, and reduces the size and manufacturing complexity of current transformers.