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Upper joint welding and joint box pouring plugging method for power generator stator winding

A technology of generator stator and welding method, which is applied in the manufacture of motor generators, electric components, electromechanical devices, etc., can solve the problems affecting the efficiency of maintenance, the difficulty of plugging and leakage, and the difficulty of plugging, so as to improve the quality and efficiency , high safety and stability, and good maintenance quality

Inactive Publication Date: 2016-07-06
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The welding of the upper end used to use asbestos nest to wrap the end and the headgear. After the headgear was heated to a certain temperature, rosin and solder were added to make the inside of the headgear filled with solder. During welding, the leakage at the bottom of the asbestos nest should be checked at any time and blocked in time. Leakage prevents molten tin from flowing into the gap at the end. Due to the heavy solder during welding, no matter how well the asbestos nest is made, tin leakage is very easy to occur
For the welding of the upper end and the filling of the insulating box, there is no forming technology in the "Guidelines for On-site Assembly Process of Hydrogenerator Stator" and "Regulations for Primary Maintenance of Electrical Equipment". The difficulty in maintenance lies in the difficulty of plugging, welding and filling Tin leakage and glue leakage occur from time to time, which not only affects the efficiency of maintenance, but also affects the quality of maintenance
In the past, the filling of the insulation box at the upper end was to insert the insulation box and then adjust the position, and then use epoxy putty to seal the lower opening of the insulation box. Due to the small gap between the stator end joint boxes and the large gap between the upper and lower wire rods , plus many reasons such as the inability to see the blockage when blocking, it is very difficult to block without leaking

Method used

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  • Upper joint welding and joint box pouring plugging method for power generator stator winding
  • Upper joint welding and joint box pouring plugging method for power generator stator winding
  • Upper joint welding and joint box pouring plugging method for power generator stator winding

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Welding method of upper joint of generator stator winding

[0050] 1. The upper end is sealed before welding

[0051] 1) Preparation:

[0052] 1. Clean the ends and gaps of the stator.

[0053] 2. Carefully clean the joints of the wire rods with acetone. The remaining glue, oxide layer and other dirt on the surface of the joints must be thoroughly removed. Use 0# sandpaper and a copper wire brush to polish the wire rod joints to see the original color, and clean them with alcohol.

[0054] 3. Use a shaping tool to correct and align the upper and lower layer wire rod leads, and the left and right tolerances should not exceed 5mm.

[0055] 4. After the calibration is qualified, put on the headgear and put in the copper wedge. The gap between the copper wire and the headgear is generally not greater than 0.3mm.

[0056] 5. Use the special tool pliers to tightly combine the baler and the strands of the wire rod, and then use the head cutting tool to cut off the excess co...

Embodiment 2

[0069] A method for filling and sealing the joint box of the upper part of the stator winding of the generator.

[0070] see Figure 5 , The plugging of the upper joint box before glue filling.

[0071] a) Preparation:

[0072] 1. Check that the insulation box should have no cracks, air bubbles, and the wall thickness is consistent and not less than 3mm. Clean the inner wall of the insulation box thoroughly with alcohol.

[0073] 2. Use alcohol to thoroughly clean the dirty parts of the joints and the cotton mud and sundries during headgear welding.

[0074] 2) Blocking:

[0075] 1. Put a rag at the notch of the upper and lower wire rods to cover all the gaps, so that the perfusion glue can be cleaned after leakage.

[0076] 2. Use a 1mm thick epoxy board to make an E-shaped insert. The size is suitable for inserting the crotch fork of the upper and lower wire rods under the headgear. Use two E-type inserts to insert the upper and lower wire rods under the headgear. Betwe...

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Abstract

The invention relates to the field of a power generator, and particularly to an upper joint welding and joint box pouring and plugging method for a power generator stator winding. The upper joint welding and joint box pouring and plugging method comprises the steps of plugging before upper end welding, performing preparation operation, plugging and end welding. The upper joint welding and joint box pouring plugging method effectively prevent tin leakage in welding and glue leakage in pouring. The upper joint welding and joint box pouring plugging method has advantages of high maintenance quality, high efficiency, high safety, high stability, concise technology, high practicability, effective cost reduction and remarkable economic benefit improvement.

Description

Technical field [0001] The invention involves the field of generators, that is, the upper joint welding of the generator stator winding and the connection box irrigation and blocking method. Background technique [0002] In the existing technology, the stator winding of the generator is composed of multiple wire rods through welding. These welding heads should be affected by various mechanical vibration during the operation of the generator.The effect of the electric power generated by the current may increase the resistance of some welding heads and cause heat. In order to ensure that the temperature of each connector of the generator stator winding during the operation of the unit is in a normal range, preventing the occurrence of welding accidents, power generation needs to be measured regularly.The DC resistance of the machine stator winding, and a large part of the DC resistance exceeds the standard and the welding quality of the stator joints is not good. For example, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K15/00H02K15/12
CPCH02K15/0068H02K15/12
Inventor 冯朝波王利强王光辉张永君孙成库刘大雷
Owner STATE GRID CORP OF CHINA