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On-the-spot Repair Method of Stator Rod Insulation of Large Generator

A generator stator and wire rod insulation technology, which is applied in the manufacture of motor generators, stator/rotor bodies, electrical components, etc., can solve the problem of ensuring the electrical strength and long-term insulation performance of the main insulation on site, and the curing temperature of epoxy glue. Difficult to fully solidify, damage to the main insulation of the stator bar, etc., to achieve the effects of shortening the repair period, good mechanical strength and process performance, and saving repair costs

Active Publication Date: 2018-08-21
HARBIN ELECTRIC MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Defects in the design and manufacture, problems in the installation process, and errors in operation and maintenance may cause damage to the main insulation of the stator bar during the operation of large generators. The conventional repair method is to use multi-adhesive mica tape and room temperature curing epoxy resin , fill up the damaged part and then bandage and cure it. Due to the low mica content in the multi-glue mica tape and the high curing temperature of the epoxy glue, it is difficult to fully cure on site, so it is difficult to ensure the electrical strength of the main insulation on site after repair. and long-term insulation performance, so the damaged stator bar can only be lifted out of the stator core slot, and the less damaged stator bar is repaired with multi-glue mica tape, while the slightly damaged stator bar is often It can only be scrapped and replaced with new wire rods. This repair method leads to problems such as poor repair quality, long repair period, and high repair cost in the on-site repair of stator wire rods.

Method used

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  • On-the-spot Repair Method of Stator Rod Insulation of Large Generator
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  • On-the-spot Repair Method of Stator Rod Insulation of Large Generator

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Embodiment Construction

[0032] The invention is a field repair method for the insulation of a large generator stator bar, which includes the following process steps:

[0033] a. Clean up the damaged part of the stator bar: the damage of the bar is as follows: figure 1 As shown, the part shown in the serial number 1 is the anti-corona layer of the stator bar, and the part shown in the serial number 2 is the damaged part of the stator bar. The damaged part 2 of the stator bar is cleaned comprehensively and carefully, and the damaged bar is first cleaned with a vacuum cleaner. Clean up near point 2, then wipe it carefully with a white cloth dipped in absolute ethanol, and proceed to the next step after confirming that the absolute ethanol has completely evaporated;

[0034] b. Grind off the anti-corona layer 1 of the damaged part 2 of the wire rod and clean it up: figure 2 As shown, use fine sandpaper to polish off the anti-corona layer 1 on the circumference of the damaged part 2. The part shown in s...

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Abstract

The invention discloses a stator wire rod insulation onsite repairing method for a large generator. The stator wire rod insulation onsite repairing method uses materials of a mica tape with low dosage of adhesive, a mica tape with high dosage of adhesive, room-temperature cured epoxy resin adhesive, a pre-impregnated glass tape (PG band) and the like; a main insulation damaged part of the stator wire rod is repaired on the site of accident of the generator; through a reasonable and reliable repairing process, the main insulation repairing of the wire rod is completed within a short time; it is ensured that the repaired stator winding can satisfy long-term, stable and reliable operational requirements of a machine set; meanwhile, a technological process of stator wire rod insulation onsite repairing for the large generator is specified; all repaired machine sets are re-input into operation; the repaired winding is excellent and reliable in insulation performance; and compared with a former generator accident treatment method, the stator wire rod insulation onsite repairing method can ensure the repairing quality, avoid disassembling and replacing of the stator wire rod, save a huge repairing cost, greatly shorten the rush repairing period, and has great economic benefit and social benefit.

Description

Technical field: [0001] The invention relates to a field repair method for the insulation of a large-scale generator stator wire rod. Background technique: [0002] Defects in the design and manufacture, problems in the installation process, and errors in operation and maintenance may cause damage to the main insulation of the stator bar during the operation of large generators. The conventional repair method is to use multi-adhesive mica tape and room temperature curing epoxy resin , fill up the damaged part and then bandage and cure it. Due to the low mica content in the multi-glue mica tape and the high curing temperature of the epoxy glue, it is difficult to fully cure on site, so it is difficult to ensure the electrical strength of the main insulation on site after repair. and long-term insulation performance, so the damaged stator bar can only be lifted out of the stator core slot, and the less damaged stator bar is repaired with multi-glue mica tape, while the slightl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K15/00H02K15/02
CPCH02K15/0006H02K15/02
Inventor 杨洲潘延明满宇光孙永鑫胡春秀杨涛张洋施伟利宋涛
Owner HARBIN ELECTRIC MASCH CO LTD
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