Method for detecting stator slot wedge of turbonator

A technology of a steam turbine generator and a detection method, which is applied in the directions of using a stable shear force to test the material strength, using a stable bending force to test the material strength, and a measuring device, etc. Into, coil out of the slot and other issues, to achieve the effect of improving the insurance factor and increasing the difficulty

Inactive Publication Date: 2014-02-12
HARBIN ELECTRIC MASCH CO LTD
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Problems solved by technology

The slot wedge is an important material for fixing the coil in the slot of the turbo-generator. In the past, due to insufficient mechanical strength of the slot wedge, the coil would go out of the slot, or the material in the slot would fall into the rotating generator due to insufficient strength of the slot wedge. Accidents of continuous destruction
However, the existing inspection technology cannot objectively and accurately analyze the reliability of the slot wedge material of the turbogenerator, and the performance strength of the slot wedge after aging at the operating temperature of the generator.

Method used

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  • Method for detecting stator slot wedge of turbonator
  • Method for detecting stator slot wedge of turbonator
  • Method for detecting stator slot wedge of turbonator

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Embodiment Construction

[0008] A turbogenerator stator wedge detection method, the detection method includes: normal bending stress value test, thermal bending stress value test, impact resistance test, shear resistance test, the specific content is as follows: a. normal bending stress value test: Steps: 1. Cut the sample on the stator wedge of the steam turbine generator according to the regulations, and process it into five samples on one side. The sample size is 80mm×10mm×4mm, and the processing error is ±0.2mm; 2. Adjust it well Span; 3. Place the sample symmetrically on the bending fixture support, and apply force at the center of the span until the test breaks. 4. Record and calculate the normal stress value, the formula σ f =3FL / 2bh 2 , where F is the applied force, in N; L is the span, in mm; b is the sample width, in mm; h is the sample thickness, in mm; The value should not be less than 340MPa; b. Hot bending stress value test: steps: 1. The sample is the same as specified in A; 2. Adjust...

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Abstract

The invention discloses a method for detecting a stator slot wedge of a turbonator. The stator slot wedge is an important insulating material and a structural component in a turbonator slot, so the service life of a stator coil of the turbonator directly depends on the performance of the stator slot wedge. The invention discloses a detection method of a stator slot wedge. Related data is acquired through a series of performance analysis tests, and reasonable and scientific performance evaluation on the stator slot wedge is obtained by comparing with a regulated experience value through data processing and mathematical analysis. A detection method is provided by simulating the realistic condition, and the operating stability of the slot wedge in the slot is checked according to the change of the mechanical performance of the stator slot wedge. The detection method mainly aims at the mechanical stress and the strain change of the stator slot wedge so as to guarantee the service life and the safety of the material in the stator slot and guarantee normal operation of the turbonator. A special test clamp for stator slot wedge shear resistance test is developed, so that the test accuracy is guaranteed.

Description

Technical field: [0001] The invention relates to a detection method for a stator slot wedge of a steam turbine generator. Background technique: [0002] Slot wedges are very important insulating materials and structural components in turbogenerator stators. The slot wedge plays the role of fastening, shockproof, vibration reduction, and increasing the discharge distance for the stator coil. Therefore, the performance of the slot wedge directly affects the service life and operation safety of the turbogenerator stator. The slot wedge is an important material for fixing the coil in the slot of the turbo-generator. In the past, due to insufficient mechanical strength of the slot wedge, the coil would go out of the slot, or the material in the slot would fall into the rotating generator due to insufficient strength of the slot wedge. Accidents of continuous damage occurred. However, the existing inspection technology cannot objectively and accurately analyze the reliability o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20G01N3/303G01N3/24
Inventor 倪苗苗张大鹏徐冰石霄峰黄玉青晔刘仁瑞
Owner HARBIN ELECTRIC MASCH CO LTD
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