Leak repairing method of phase connection lines of stator winding in turbonator

Abstract

The invention discloses a leak repairing method of phase connection lines of a stator winding in a turbonator. The leak repairing method includes the steps that leak points are heated through two welding guns with the 180-degree inclined angle, meanwhile, the temperature is detected through a silver solder, when the silver solder is melting, the leak points are evenly coated with the silver welding powder, the silver solder is placed on the silver welding powder, welding-all-around is conducted on the leak points on the phase connection lines, and the surfaces of the welded parts are coated with the silver welding powder again 1-2 minutes after welding is completed, then the portions where plated silver is exfoliated are grinded through abrasive cloth to be smooth, the two welding guns with the 180-degree inclined angle heat the tin-enameled portions while the temperature is detected through tin bars, when the tin bars are melting, the tin-enameled portions are evenly coated with soldering paste so that immunities can be removed, and then the tin bars are boned onto the soldering paste. The leak repairing method is simple in operation, the workload of inspectors is lowered, and working efficiency is improved.

Description

technical field [0001] The invention relates to an air tightness and electric leakage detection method of a steam turbine. More specifically, the present invention relates to a method for trapping the connecting wires of stator windings in turbogenerators. Background technique [0002] The No. 2 generator of Datang Guiguan Heshan Power Generation Co., Ltd. is a T225-460 turbogenerator. The generator is composed of a stator and end structural parts, a rotor, and a generator excitation device. The stator winding of the generator is directly cooled by deionized water with a pressure of 0.25MPa. The stator core and rotor winding are cooled by hydrogen gas with a pressure of 0.30MPa. The lubrication of the generator bearing is provided by the lubrication system of the steam turbine bearing. [0003] The stator of the generator is composed of a machine base, an outlet cover, a hydrogen cooler, a stator core, a stator winding, and a stator lead wire. Deionized water flows in the ...

AI Technical Summary

Problems solved by technology

[0004] Since the hydrogen pressure in the generator chamber is greater than the pressure of the stator cooling water, the hydrogen content in the generator stator cooling water tank often exceeds 2% and an alarm signal is issued during operation. Therefore, it is necessary to check and repair the connected wiring. It does not react with metals and is also insoluble in metals. The welding process is basically a simple process of metal melting and crystallization, so a relatively pure and high-quality weld can be obtained, and it has a good welding effect on tiny gaps on the phase connection line, but Since the connecting wires of the stator windings in this generator are made of copper tubes, and the copper tubes dissipate heat too quickly, the use of argon arc welding cannot achieve good results.

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