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Method for preparing high-resistance corona-prevention belt of high-voltage motor

A high-voltage motor and high-resistance technology, applied in the shape/style/structure of winding insulation, winding insulation materials, etc., can solve problems such as smoke, flashover, and anti-corona layer breakdown, and achieve stable surface electric rate values Effect

Inactive Publication Date: 2009-01-21
王翠苓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the anti-corona tape commonly used in the stator coils of domestic high-voltage motors (rated voltage 6.3kV~27kV) is glass ribbon impregnated with resin or brushed with high-resistance paint, but the above-mentioned anti-corona materials have the following problems: the resistivity of the anti-corona material surface is unstable , resulting in frequent discharge and flashover of the anti-corona layer at the end; after the motor stator is installed, the corona voltage (corona onset voltage) generated by the motor stator winding is low, which may easily cause breakdown of the anti-corona layer along the surface, resulting in flashover, creeping Electricity, smoke and other phenomena will affect the normal and safe operation of the motor

Method used

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Experimental program
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Effect test

specific Embodiment approach 1

[0010] Specific embodiment one: the steps of preparing medium and high resistance anti-halation belts in this embodiment are as follows:

[0011] Step 1. Use 0.10±0.02mm×25mm electrical non-alkali glass fiber braided belt or polyester non-woven fabric belt;

[0012] Step 2, using a single or mixed epoxy, phenolic or polyester resin as 20% to 48% by weight, toluene, alcohol and acetone as a composite solvent of 80 to 52% by weight, the ratio of toluene, alcohol and acetone The ratio is 1:1:1, and it is prepared into a mother liquor, and then according to the percentage of the weight of the mother liquor, add non-linear green or gray silicon carbide with a particle size of 280 mesh to 3000 mesh and different resistance values ​​of 50% to 130%, 2 to 10 % of graphite or carbon black, 3-10% of ferric oxide (Fe 2 o 3 ), 0.5-3% of inorganic suspending agent (fumed silica powder) and 0.5-1.5% of vegetable oil regulator, stirred into a uniform liquid;

[0013] Step 3. Put the 0.10±0...

specific Embodiment approach 2

[0015] Specific embodiment two: the step two of present embodiment is by weight percentage by epoxy, phenolic or polyester resin be 20%, toluene, alcohol and acetone are the composite solvent of 80% by weight percentage, the ratio of toluene, alcohol and acetone is 1:1:1, make mother liquor, then add non-linear green and or gray 50% silicon carbide, 10% graphite, 3% of ferric oxide (Fe 2 o 3 ), 0.5% inorganic suspending agent and 1.5% vegetable oil regulator. The surface resistivity is between 3MΩ and 100000MΩ. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Specific embodiment three: step 2 of the present embodiment is 34% by weight percentage by epoxy, phenolic or polyester resin, and toluene, alcohol and acetone are the composite solvent of 66% by weight percentage, and the ratio of toluene, alcohol and acetone is 1: 1: 1, prepare mother liquor, and then add non-linear green or gray 90% silicon carbide, 6% carbon black, 6 % of ferric oxide (Fe 2 o 3 ), 1.5% inorganic suspending agent and 0.8% vegetable oil regulator. The surface resistivity is between 200MΩ and 300000MΩ. Other steps are the same as in the first embodiment.

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PUM

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Abstract

This invention relates to high voltage motor and low resistance anti-air process method, which comprises the following steps: adopting alkali-free glass band or polyester cloth band; b, single or mixture oxygen, phenol aldehyde or polyester resin, toluene alcohol and acetone to form parent liquid and then adding it with black lead, carbon and plant oil adjusting agent for mixing into even liquid; c, putting the matched liquid into tank for dipping; d, putting the band diped with liquid into gap yoke machine then into drying furnace to process low anti-air band.

Description

technical field [0001] The invention relates to a preparation method of an anti-corona belt for a motor. Background technique [0002] There is a high voltage difference between the end of the low-resistance anti-corona layer of the stator coil in the slot of the high-voltage motor and the end of the copper core guide rod in the coil insulation, so that the electric field at the end of the low-resistance section is concentrated, that is, the potential changes abruptly, thereby generating electric current gosh. At present, the anti-corona tape commonly used in the stator coils of domestic high-voltage motors (rated voltage 6.3kV~27kV) is glass ribbon impregnated with resin or brushed with high-resistance paint, but the above-mentioned anti-corona materials have the following problems: the resistivity of the anti-corona material surface is unstable , resulting in frequent discharge and flashover of the anti-corona layer at the end; after the motor stator is installed, the cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K3/40H02K3/30
Inventor 王翠苓
Owner 王翠苓
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