Low-speed Rotating Electric Heating Technology for Turbine Generator Rotor Dynamic Balance Test

Abstract

The invention relates to a low-speed rotating electric heating technology for a steam-turbine generator rotor in a dynamic balance test. By adopting the technology, the target of finishing a thermal aging test by heating a rotor is achieved by feeding exciting current into a low-speed rotation rotor, the effect of rotor deflection is overcome by rotation of the rotor, the effect on test equipment and the like caused by a rotary magnetic field is neglected by controlling the rotation speed, heating of the rotor by a simple and practical method is finally achieved, and the condition that the effect of heating the rotor meets all requirements is ensured.

Description

Technical field: [0001] The invention relates to a low-speed rotating electric heating process during a dynamic balance test of a steam turbine generator rotor. Background technique: [0002] During the dynamic balance test of the turbogenerator rotor (1), a thermal aging test of the turbogenerator rotor (1) is required. The aim is to ensure that the turbogenerator rotor (1) rotates for a period of time to achieve aging under the condition that the temperature and rotational speed of the turbogenerator rotor (1) meet the requirements. In order to achieve the purpose of thermal aging of the turbogenerator rotor (1), there are two types of process methods, one is to heat the turbogenerator rotor (1) to the required temperature and then increase the speed to the rated speed, and the other is to heat the turbogenerator rotor (1) to the rated speed; After the generator rotor (1) speeds up to the rated speed, the turbine generator rotor (1) is heated to the required temperature. ...

AI Technical Summary

Problems solved by technology

[0004] 1) Static electric heating process, the turbogenerator rotor (1) is heated with excitation current at rest until the temperature reaches the requirement, then the turbogenerator rotor (1) is turned off and started up to the rated speed, and the thermal aging test is carried out. This process method is relatively backward, mainly due to the influence of the deflection of the turbine generator rotor (1) on starting and speed-up, which makes the speed-up time relatively long and brings serious temperature loss;

[0005] 2) Wind mill heating process, the turbogenerator rotor (1) body is wrapped in a box-type heating cover, the speed is increased to the rated speed, and the surface of the turbogenerator rotor (1) is heated by friction with the air (8) until the steam The temperature of the turbine generator rotor (1) meets the requirements, and thermal aging test is carried out. This process method is relatively popular, but it needs to manufacture a heating mantle, which is not suitable for the dynamic balance test room with relatively small space;

[0006] 3) High-speed rotating electric heating process, the turbogenerator rotor (1) body is wrapped in a cage-type shield, and the speed is increased to the rated speed, and the turbogenerator rotor (1) is electrically heated by exciting current. The role of the shield reduces the influence of the rotating magnetic field of the turbogenerator rotor (1) on the dynamic balance test room, and high-speed rotating electric heating can be realized. After the temperature of the turbogenerator rotor (1) reaches the required temperature, the excitation current is cut off and the test is carried out. Heat sensitivity test, although this process is a method of heating the turbine generator rotor (1), the purpose of the test is not thermal aging, the test cost is high, difficult, and has certain risks;

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