Modularized electronic tripping device for low-voltage breaker

Abstract

The invention discloses a modularized electronic tripping device for a low-voltage breaker. A mutual inductor is arranged in a groove of an mutual inductor bracket; the groove is opened on the upper wall of the mutual inductor bracket; the side wall of the mutual inductor bracket is provided with a positioning hole which is communicated with the groove; an insulating piece is positioned in the positioning hole and passes through the mutual inductor; a circuit board and an executing element are respectively arranged on a circuit board and executing element bracket; and the circuit board and executing element bracket is buckled to the upper part of the mutual inductor bracket to form a modularized overall structure. By using the modularized electronic tripping device, the overall assembly and the overall detection of the electronic tripping device are realized; and during assembly, an electronic tripping device module is integrally arranged in a base of the breaker and the base saves a plurality of limiting characteristics which are matched with the mutual inductor, so that the base has a simple structure, the assembly is simple, the detection is convenient, and production efficiency and economic benefit are improved. Connecting lines in the electronic tripping device are ordered and positioning is reliable, so that the electronic tripping device can ensure no potential safety hazard after the assembly, and ensure the safety and the reliability of equipment.

Description

technical field [0001] The invention relates to an electronic release used in a low-voltage circuit breaker. Background technique [0002] Commonly used low-voltage circuit breakers include power distribution type, motor protection type, residual current protection type and electronic type. The electronic low-voltage circuit breaker has the functions of overload long-time delay, short-circuit short-time delay, short-circuit instantaneous and undervoltage protection, etc., and plays a reliable role in protecting power distribution lines and electrical equipment. The various functions of the electronic circuit breaker are realized by the electronic trip unit, and the electronic trip unit is mainly composed of transformers, circuit boards and actuators. Each pole of the low-voltage circuit breaker is equipped with a transformer to detect the current status flowing through the circuit breaker in real time. The transformer converts the large current into a small current signal a...

AI Technical Summary

Problems solved by technology

[0003] In the existing electronic release, the transformer, circuit board and actuator are mutually independent structures and need to be installed separately one by one. The defect is: in the production process, each component needs to be installed in the low-voltage circuit breaker before it can be released. To test the electronic trip unit, the electronic trip unit cannot be tested as a whole before installation, resulting in complicated assembly procedures and low production efficiency

[0004] The transformers of existing electronic circuit breakers are generally positioned directly on the base of the low-voltage circuit breaker, and many limit features that cooperate with the transformers need to be set on the base, which makes the structure of the base complex

[0005] In the existing electronic release installation method, each transformer has a lead wire connected to the circuit board, and there is also a connecting wire between the circuit board and the actuator. The wiring is messy and the connecting wire is not positioned, which is easy to be damaged and easy to touch to the main circuit of the circuit breaker, causing a safety hazard

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