Thyristor contactor current detection device

Abstract

Disclosed is a thyristor contactor current detection device, which comprises a display panel and a mainboard connected with each other, wherein the mainboard is provided with a microprocessor; the microprocessor is connected with modules including a thyristor driving circuit, a thyristor status detection circuit, a current detection circuit, a power supply circuit, a fan driving circuit, a starting control signal detection circuit, a silicon controlled rectifier status indicating lamp, a temperature detection circuit, an overtemperature fault indicating lamp, a starting DO output and a fault DO output; the current detection circuit is connected with a current detection device for detecting a current of a rotor coil; the thyristor driving circuit and the thyristor status detection circuit are connected with a thyristor module for controlling the switching on and off of the rotor coil; the current detection device comprises an outer shell which is internally provided with a hollow coil wound on an insulating support; and the coil is used for being threaded by a conductor, and the coil comprises a connector which is used for being connected with a circuit board for outputting an induced voltage.

Description

technical field [0001] The invention belongs to the technical field of contactors, in particular to a thyristor contactor current detection device. Background technique [0002] The document whose application number is 200410081710.8 discloses "a power supply device (1) for supplying power to an electronic protection device used in a low-voltage circuit breaker. The power supply device mainly includes a primary conductor (11), a secondary coil (12), a first A magnetic circuit (10) and at least one second magnetic circuit (20). The first magnetic circuit (10) surrounds the primary conductor (11), and the phase line protection is provided for the primary conductor (11) by a protective device; meanwhile, The first magnetic circuit (10) constitutes the core of said secondary coil (12) for powering the protective device. The second magnetic circuit (20) is structurally separated from the first magnetic circuit (10), but operationally It is connected to it for subtracting a part ...

AI Technical Summary

Problems solved by technology

However, iron-core transformers have a problem of magnetic saturation, which is due to the limited characteristics of the ferromagnetic materials that make up the transformer, resulting in a serious deterioration of the linearity of the readings with the range of current in the measured conductor

Other problems come from the size and weight of the iron core transformer, the high cost of winding and the heat generation of the iron core material due to iron loss, which will lead to the deterioration of the detection accuracy

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