Undervoltage tripper with low power consumption and applicable to three-phase supply

A technology of undervoltage release and three-phase power supply, which is applied in the direction of protection switch operation/release mechanism, etc., which can solve problems such as undervoltage release misoperation, circuit breaker false opening, imperfection, etc., to overcome the starting torque Small, to avoid harmonic interference, to broaden the effect of the use of occasions
CN102768924AInactive Publication Date: 2012-11-07CHANGZHOU INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGZHOU INST OF TECH
Publication Date
2012-11-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an undervoltage tripper with low power consumption and applicable to a three-phase supply. The undervoltage tripper comprises an electromagnet coil, an armature, a rectification circuit, a buck circuit, a relay, line voltage detection modules, a sampling circuit and a main control module, wherein the main control module stores a rated voltage Ue and a strong start voltage value and is used for collecting an output voltage and a voltage period of each line voltage detection module, so that an effective value of each line voltage of the three-phase supply is calculated; when the effective value of each line voltage of the three-phase supply reaches to 80% of the rated voltage Ue and a sampling voltage of the sampling circuit reaches to the strong start voltage value, a normally opened contact is closed firstly, and a switch circuit is turned on, after the armature is closed, the normally open contact is disconnected; and when the effective value of any one line voltage is less than 50% of the rated voltage Ue, the switch circuit is turned off.
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Description

technical field

[0001] The invention relates to an undervoltage release device with low power consumption and suitable for three-phase power supply. Background technique

[0002] The undervoltage release is one of the important components of circuit breakers, especially frame circuit breakers. The undervoltage release is a release that makes the circuit breaker disconnect with or without delay when its terminal voltage drops to a certain range. When the power supply voltage drops (even slowly) to the rated operating Within the range of 70% to 35% of the voltage, the undervoltage release should act (the coil of the release is de-energized, and the movable armature in the coil is pushed out by the return spring—tripping), and the undervoltage release will trip when the power supply voltage is equal to When the rated operating voltage of the undervoltage release is 35% of the rated operating voltage, the undervoltage release should be able to prevent the circuit breaker from c...

Claims

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