Excitation slip ring bus-bar system and excitation system slip ring polarity adjusting method

Abstract

The invention discloses an excitation slip ring bus-bar system and an excitation system slip ring polarity adjusting method. The system comprises a magnetic blow-out switch, a generator, a shunt, and buses. The system further comprises a triple terminal. The buses include a bus from a power cabinet and an outlet negative bus of the magnetic blow-out switch. The positive electrode of the bus from the power cabinet is connected to the generator through the triple terminal, and the negative electrode of the bus from the power cabinet is directly connected to the input end of the magnetic blow-out switch. The negative bus at the output end of the magnetic blow-out switch is connected to the shunt and the generator through the triple terminal. With the system, by adjusting the short connection between the contacts of the triple terminal, a 300MW generator excitation system can carry out positive and negative electrode exchange, and wear of the two collectors of a slip ring caused by the cathode effect is eliminated.

Description

technical field [0001] The method belongs to the field of generator excitation systems, and in particular relates to a method for adjusting the polarity of slip rings by changing the excitation slip ring busbar system. Background technique [0002] The power supply and its auxiliary equipment that supply the excitation current of the synchronous generator are collectively referred to as the excitation system. The generator excitation system is one of the main equipment of the generator. Its electrical connection method is as follows: figure 1 As shown, the generator slip ring frame, brush holder, and carbon brush are important components of the excitation system, and their performance (especially in terms of slip ring wear) has an important impact on the economy of the power plant. [0003] If the positive and negative polarities of the slip ring are not replaced in time, a cathode effect will occur, which will cause unbalanced wear of the two poles of the slip ring, serious...

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Problems solved by technology

However, after the production of HS11B-4000 / 209 and above (including 4000 type) double-headed switch blades, the actual size is too large, weighing about 1,000 kilograms, and it cannot be placed in the demagnetization cabinet (100mm×120mm×230mm, width×depth×height). ) installed in

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