Anti-condensation method and device for enclosed busbar of hydrogen-cooled generator

Abstract

The invention discloses an anti-condensation method and device for an enclosed busbar of a hydrogen-cooled generator. The method comprises the following steps of: measuring pressure distribution in a housing of the enclosed busbar, comparing the measurement result with pressure calibration distribution in the housing of the enclosed busbar and determining whether the pressure distribution in the housing of the enclosed busbar is abnormal or not according to the comparison result; if so, carrying out coarse filtration on a to-be-treated gas source from a gas compensating and supply system through a gas source pipeline filter, and obtaining a target micro-positive pressure gas through a frozen micro-positive pressure device; and keeping the pressure of the target micro-positive pressure gas fed into the enclosed busbar in a micro-positive pressure state and simultaneously pulling out a sampling pipe on the frozen micro-positive pressure device, thereby discharging a wet gas in the enclosed bus through the sampling pipe. According to the anti-condensation method for the enclosed busbar of the hydrogen-cooled generator, the abnormal phenomena of insulation deterioration, condensation, flashover, hydrogen leakage and the like of the enclosed bus can be avoided.

Description

technical field [0001] The invention relates to the technical field of power generation, in particular to an anti-condensation method and device for a closed busbar of a hydrogen-cooled generator. Background technique [0002] At present, most 200MW and above generators and main transformers use phase-isolated closed bus bars, and support insulators are used to keep the distance between the bus bar conductors and the metal shell to prevent deformation. In order to maintain the insulation performance of the insulator and avoid accidents caused by partial "discharge" and "flashover", the air in the closed busbar must be dried and cleaned, and at the same time, it is necessary to prevent external moist air from entering the closed busbar. This is the phase-isolated type. The main reasons and basis for the slightly positive operation of the closed busbar. [0003] Most of the existing micro-positive pressure devices used to close the bus adopt the principle of adsorption molecu...

AI Technical Summary

Problems solved by technology

Since molecular sieve regeneration needs to divert 20% of the dry gas, which is an energy-consuming product, the equipment cannot meet the requirements of clean and dry air for the compressed gas charged into the busbar during operation.

Coupled with seasonal climate changes, weather changes, rainy seasons, and temperature differences between day and night, when the generator set load fluctuates and the phenomenon of "breathing" is serious, it is easy to generate condensation when the busbar is closed under a certain ambient humidity, which may cause a grounding short circuit accident at the generator outlet Security risks

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