A generator rotor insulation monitoring brush device

Abstract

A generator rotor insulation monitoring brush device, including a lever device, the lever device is fixed on the casing of the unit through the lever shaft and bearings on both sides, one end of the lever device is slotted into a carbon brush, and the lead wire of the carbon brush passes through the lever device and comes out from the Its lower part is drawn out and finally connected to the aviation plug; the other end of the lever device is connected with an iron core, and the iron core and the lever device are connected flexibly. The iron core passes through the spring and is inserted into the electromagnetic coil. The spring is located between the electromagnetic coil lever device During this period, when the electromagnetic coil is energized, the iron core is subjected to downward electromagnetic attraction, at this time the spring is compressed, the iron core drives the lever device to move downward, and the carbon brush end is lifted.

Description

technical field [0001] The invention relates to the field of electrical control, in particular to a generator rotor insulation monitoring brush device. Background technique [0002] The rotors of existing large generators mostly use injection-type grounding protection devices, and the insulation resistance value of the rotor windings is measured by using an independent brush-lifting device to regularly lift the brushes to contact with the slip ring shaft. At present, there are few types of brush lifting devices on the market as an important part of the protection device, and the existing types of carbon brushes are all open-type structures, which do not have a dustproof function, and the brush lifting force is relatively small. The brush lifting device is generally installed inside the excitation end of the generator. Due to the complex environment of the industrial site, it has been in a high temperature, dusty, electromagnetic and air-cooled circulating environment for a l...

AI Technical Summary

Problems solved by technology

The brush lifting device is generally installed inside the excitation end of the generator. Due to the complex environment of the industrial site, long-term exposure to high temperature, dust, electromagnetic, and air-cooled circulation environment, dust, condensed water and other impurities in the circulating cold air can easily enter the brush lifting device Internally, the inside of the device will be dirty and rusted, which will eventually cause the device to be stuck, directly affect the normal operation of the protection device, and even cause false alarms and cause the generator to trip

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