Excitation system

Abstract

The invention discloses an excitation system. The excitation system comprises a supporting base, a rotor rotatably arranged on the supporting base, and a brush holder arranged on the supporting base in a penetration manner and abutted with the rotor. The brush holder comprises a carbon brush rack, an insulated carbon brush, an elastic part and a handle, wherein the insulated carbon brush comprises a carbon brush main body, a lead wire and an insulated layer. The carbon brush main body comprises a first end surface, a second end surface and a side surface serving as a polishing layer; the lead wire is arranged on the first end surface in a penetration manner and electrically connected with the carbon brush body; the insulated layer is used for partially wrapping the side surface. An accommodating slot is formed in the carbon brush rack, and the insulated carbon brush is accommodated in the accommodating slot in a sliding manner; the elastic part is elastically connected with the insulated carbon brush; the handle is connected with the carbon brush rack, a retaining screw is arranged on the handle, and the lead wire and the retaining screw are connected or disconnected. By manufacturing the insulated carbon brush for the rotor of the excitation system, an excitation connecting busbar on the supporting base is prevented from being dismounted, so that the accuracy of test results of relevant tests when a power generator rotor is in a cold (hot) state is guaranteed, the grid-connection time of the power generator is moved up, the working efficiency is improved and the stability of generator operation is improved.

Description

technical field [0001] The invention relates to an excitation system. Background technique [0002] In a power plant, in order to monitor the insulation of the generator rotor in the generator stator bore, etc., it is necessary to test the dynamic (static) state of the generator rotor under the cold (hot) state, such as: dynamic waveform method, Repeated pulse method, DC resistance method, AC resistance method, AC impedance and power loss test in hot (cold) state, etc. [0003] The traditional experience and practice is that the connecting busbar at the support of the excitation carbon brush needs to be removed first, and then the test can be carried out. When removing and installing the connecting busbar, on the one hand, it takes a long time; on the other hand, repeated dismantling and assembling of the busbar is not conducive to the conduction of the hard connection between the busbar and the support. As a result, the work efficiency is reduced, the time for grid connec...

AI Technical Summary

Problems solved by technology

When dismantling and installing the connecting busbar, on the one hand, it takes a long time; on the other hand, repeated disassembly and installation of the busbar is not conducive to the conduction of the hard connection between the busbar and the support

As a result, the work efficiency is reduced, the time for grid connection is increased, and the reliability of the busbar connection is also reduced, which makes the operation stability of the unit decrease.

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