A method for detecting the looseness of the laminations of the stator core of a hydro-generator

Abstract

The invention provides a method for detecting the looseness of the laminations of the stator iron core of a hydro-generator, which includes: setting the normal temperature value of the stator iron core of the generator set, the highest temperature alarm value, the normal vertical extreme frequency vibration amplitude of the stator iron core, and the alarm value. ; Obtain the temperature value of the stator core of the generator set, the active power of the generator, the excitation current of the generator, and the vertical pole frequency vibration amplitude of the stator core; establish a mathematical model to obtain the combined value and average value of the highest temperature value, the vertical pole frequency vibration amplitude ; Calculate the maximum temperature of the stator core, the slow variable of vertical polar frequency vibration and the predicted values ​​of the first and second alarms, determine the loose position of the stator core laminations, and finally detect the looseness of the stator core laminations, and formulate maintenance, treatment plans and Measures to deal with the stator core laminations of the generator. Accurate detection of the loose fault of the laminations of the stator iron core of the hydro-generator is realized.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for detecting a loose fault of a generator stator iron core lamination, and belongs to the technical field of generator fault detection. Background technique [0002] The looseness of stator core laminations is one of the important reasons for generator failure. The main reasons for the looseness of generator stator laminations are: 1) Defects in generator structure design, lamination material and manufacturing; 2) Stator iron During the installation of the core laminations, the tension or compactness is not enough, etc., which do not meet the installation requirements; 3) The stator core laminations of the generator are polluted due to oil leakage from the guide bearing oil basin. When the laminations of the stator core of the generator are loose, it will cause the hysteresis loss of the stator core to increase, the local temperature to increase and the vibration of the core to inc...

AI Technical Summary

Problems solved by technology

[0003] Existing techniques for detection of generator stator core lamination loose faults include: 1) Analyze the stator core lamination looseness by tightening the screw tightness of the generator stator core. When the sheet is loose, it will be carried out after shutdown, and the real-time performance is insufficient; 2) Through the noise detection and analysis of the stator core lamination looseness in the running state of the generator, it is easily affected by the operating conditions of the generator and restricted by the technical level of the inspector; 3) Through the power generation The stator core temperature detection and analysis of the stator core laminations are loose. Because there are many temperature detection points, the temperature change may not be found in time. At the same time, there are many factors causing the core temperature change, which need to be manually analyzed and eliminated; 4) Through the generator Stator core vibration data detection and analysis The stator core laminations are loose. Since there are many influencing factors that cause core vibration, manual analysis and elimination are required; 5) Iron loss test or magnetization test is performed on the stator core during maintenance to analyze the The core lamination is loose, the process is complicated, the investment of manpower is large, and it takes a long time

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