Online monitor for generator carbon brush wear

Abstract

The invention discloses an online monitor for generator carbon brush wear. Pre-embedded wires, the front end of which is embedded inside a carbon brush, are arranged on the carbon brushes; the distance from the front end of the pre-embedded wires to the front end of the carbon brushes is less than the distance from the front end of brush cords to the front end of the carbon brushes; the embedded wires are connected to signal collection devices via signal wires, and the signal collection devices are connected to an alarm device by way of wired connection or wireless transmission; and the signalwhich is processed and sent is collected by the signal collection devices, so as to control the alarm device to issue an alarm signal. The online monitor for generator carbon brush wear of the invention can continuously monitor the wear condition of the carbon brushes during the use of the generator; when the carbon brushes are worn to a certain value, an electric signal is generated and is promptly issued; and thereby the damage of the collector ring, caused by the direct contact of the copper conductive brushes and the surface of the collector ring, is effectively prevented, and the temperature rise caused by the rise of contact resistance formed by the surface damage of the collector ring is further prevented.

Description

technical field [0001] The invention relates to an accessory part of a generator carbon brush, in particular to an on-line monitoring instrument for generator carbon brush wear. Background technique [0002] The carbon brush of the generator is set on the brush holder, and the front end of the carbon brush is in contact with the collector ring, and its function is to connect the external power supply of the generator (usually DC Excitation current ), through the slip ring on the Collecting ring , Provided to the winding of the rotor (excitation winding), due to the high-speed rotation of the collector ring, the front end of the carbon brush has been worn, so the length of the carbon brush will gradually shorten. [0003] Generator carbon brushes are always worn out during operation and are consumables. They need to be replaced every six months to one year on average depending on the working conditions. However, the wear condition of the carbon brushes is currently observe...

AI Technical Summary

Problems solved by technology

However, the wear condition of the carbon brushes is currently observed by the inspectors with the naked eye, which increases the workload of the inspectors on the one hand, and on the other hand, if the inspectors do not observe carefully, they may miss the worn carbon brushes. Since the conductive brush braids are pre-buried at the tail of the carbon brush, if the carbon brush wears to the position of the brush braids, the direct contact of the copper conductive brush braids with the surface of the collector ring will cause loss of the collector ring, and the loss of the collector ring surface will cause The contact resistance with the carbon brush increases, which causes the temperature to rise. After the temperature rises, it will cause further loss of the collector ring, which will form a vicious circle.

Images