Gas generator set rotor shaft voltage on-line monitoring device

Abstract

The invention relates to the technical field of generator monitoring, in particular to a gas generator set rotor shaft voltage on-line monitoring device which comprises two monitoring device bodies and a set control cabinet, wherein each monitoring device body comprises a conductive carbon brush and an electric brush support, the conductive carbon brushes are tightly attached to a rotor shaft, the electric brush support is provided with a brush holder, the conductive carbon brush is fixed on the electric brush support through the brush holder, the electric brush support is provided with a metal end part, one end of the metal end part is connected with the conductive carbon brush through a lead, and the other end of the metal end part is connected with a high internal resistance voltmeter in the unit control cabinet through a cable. The generator excitation end large shaft leads out the shaft voltage through the conductive carbon brush device, the shaft voltage is connected into the set control cabinet, in the working process of the generator, the numerical value of the shaft voltage can be monitored in real time, the damage risk of main equipment of the generator is reduced, and meanwhile the safety risk caused by manual measurement is avoided.

Description

technical field [0001] The invention relates to the technical field of generator monitoring, in particular to an online monitoring device for the rotor shaft voltage of a gas generator set. Background technique [0002] During the rotation of the generator, as long as there is an unbalanced magnetic flux linked to the shaft, an induced potential will be generated at both ends of the shaft of the generator. This induced potential is called the shaft voltage. In order to eliminate the current loop formed by the shaft voltage passing through the bearing, the base and the foundation, etc., and prevent the shaft current from burning the tile surface, the bearing seat should be insulated from the ground. In order to prevent the rotating shaft from forming a floating potential, the rotating shaft must also be grounded through the brush. When the insulating pad of the bearing base loses its insulating performance due to oil pollution, damage or aging, the shaft voltage is sufficie...

AI Technical Summary

Problems solved by technology

The main reason is that the 9F heavy-duty gas-fired generator sets are all imported control systems, which only monitor the shaft voltage frequency. Because there is no requirement for direct monitoring of the shaft voltage in foreign design and manufacturing specifications, the monitoring system is not designed, which does not meet the national standard "Invisible Pole". Synchronous Generator Technical Requirements "GB / T7064-2017 Requirements for Shaft Voltage Data Monitoring

At the same time, the value of the shaft voltage cannot be obtained in real time, which will increase the risk of damage to the main equipment of the generator

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