An anti-siphon method for generator stator cooling water system

Abstract

The invention discloses a generator stator cooling water system anti-siphon method, and belongs to the field of generator cooling. The method comprises the following steps of a, a water inlet pipe ofan anti-siphon device is connected to an inlet of a generator stator coil, and a water outlet pipe is connected to an outlet of the generator stator coil; b, a volume expansion device is placed in a place higher than the generator stator coil outlet, and is connected to the space between the generator stator coil outlet and a water tank through a pipeline to form a cooling water flowing channel; and c, the volume expansion device is communicated with the upper part of the water tank through a vent pipe to form an air flowing channel from the upper part of the water tank to the interior of thevolume expansion device, so that air in the upper part of the water tank is guided into the volume expansion device through the air flowing channel, and the interior of the generator stator coil is full of water. According to the method, the anti-siphon device is connected to the generator stator coil, so that the risk of wire rod electric flashover and insulation loss can be avoided, a high anti-siphon effect is achieved, and the operation reliability of the generator set can be effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of generator cooling, in particular to an anti-siphon method for a generator stator cooling water system. Background technique [0002] The stator coil of a large-capacity water-cooled hidden pole generator usually uses water medium to cool the stator coil. The generator enters the stator coil through the inlet of the generator stator coil. After cooling the water medium of the generator stator coil, it flows back from the outlet of the generator stator coil to the lower water tank, and repeats itself to form a closed circulating water system. When all the water pumps fail, the negative pressure of the water medium in the return pipe of the stator coil due to gravity will draw out the water medium in the stator coil, resulting in an anhydrous or mixed state of water and air in the stator bar of the generator, and there may be water in the coil Risk of electrical flashover, insulation damage or reduced lifet...

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Problems solved by technology

[0004] The stator cooling water system of the thermal power plant generator disclosed in this patent document can automatically start the stator cooling water system when the stator cooling water system is completely stopped; when the stator cooling water system is running, it can realize the stator cooling water system. However, when the water pump of the stator cooling water system suddenly fails and the cooling water system stops running, it cannot effectively avoid the risk of electric flashover of the wire rod and insulation damage due to the siphon effect of pumping out the water in the stator coil. Affect the reliability of generator set operation

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