Hydro-generator set air gap measuring method and measuring device

Abstract

The invention discloses a hydro-generator set air gap measuring method. The measuring method includes the following steps: 1) a measuring device is prepared, which includes a round nut, a stud in mutual threaded connection with the round nut, and a handle fixedly connected on an outer side face of the round nut, wherein the round nut and the stud form a screw pair; 2) a wooden wedge is utilized to predict a gap value; 3) the total length of the screw pair is adjusted according to the predicted gap value; and 4) the screw pair is inserted between a magnetic pole and an iron core from a side face of a magnetic pole surface vertical center line, then the screw pair is moved transversely to pass through a gap between the magnetic pole and the iron core, the length of the screw pair is adjusted again according to the degree of tightness of the screw pair between the magnetic pole and the iron core, when the degree of tightness is appropriate, a vernier caliper is utilized to measure the length of the screw pair, and a measured value is an air gap value of a certain measuring point. The measuring method is easy and convenient to operate, data are accurate when air gap measurement is performed, and the measuring device that is used is simple in structure and low in manufacturing cost.

Description

technical field [0001] The invention relates to a method and a device for measuring the gap between objects, in particular to a method and a device for measuring the air gap of a water turbine generator set. Background technique [0002] The air gap between the rotor magnetic pole and the stator core must be measured and adjusted during maintenance or installation of the hydro turbine generator set in a hydropower plant to ensure that the air gap is as evenly distributed as possible. Such as image 3 The schematic diagrams of rotor poles and stator cores are shown, which mainly include magnetic poles 100 , magnetic end pressure plates 200 , iron cores 300 , iron core pressure plates 400 , and air gaps 500 . Whether the measurement result of the air gap 500 is accurate or not directly affects the stable operation of the whole unit. [0003] At present, the air gap of the hydro-generator is generally measured by the wooden wedge pressing method. This measurement method can on...

AI Technical Summary

Problems solved by technology

If the air gap is adjusted according to these data, the air gap distribution is asymmetrical and uniform, and the magnetic flux density is not symmetrical and uniform. The direct consequence is that the unit vibrates greatly during operation, and the transverse differential current and split phase differential current of the generator stator will also increase. The most serious consequence is that the unit will not be put into operation when the transverse differential current and split phase differential current exceed the specified values.

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