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Oil-immersed current transformer insulation discharge pulse detection device

A current transformer and discharge pulse technology, which is applied in the field of power transmission and transformation, can solve the problems of hidden safety hazards and high operational risks, and achieve the effects of improved accuracy, excellent insulation performance, and not easy to crack

Active Publication Date: 2019-11-05
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the long-term use, it was found that the discharge detection device has potential safety hazards in the operation process: when the existing detection device needs to be suspended on the cable for detection, it is necessary for the staff to directly open and close the current sensor by hand before hanging on the cable. In the meantime, the current sensor needs to be closed and locked manually, which is a dangerous operation

Method used

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  • Oil-immersed current transformer insulation discharge pulse detection device
  • Oil-immersed current transformer insulation discharge pulse detection device
  • Oil-immersed current transformer insulation discharge pulse detection device

Examples

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preparation example Construction

[0023] The present invention also includes the preparation method of insulating paint, comprises the following steps:

[0024] Mix phenol and basic catalyst, raise the temperature to 100-110°C, and reflux for 20-40 minutes to obtain a mixed solution; the mass ratio of phenol and basic catalyst is 100:5-10;

[0025] To step Furfural is added dropwise to the obtained mixed solution, and the reflux reaction is continued at 100~110°C for 2~3 hours after the dropwise addition to obtain a phenolic resin; the mass ratio of the 3,5-xylenol to furfural is 100:120~150;

[0026] ③Combine polyisocyanate, isopropanol and step The obtained phenolic resin is mixed evenly to obtain a polyurethane modified phenolic resin; the polyisocyanate is toluene diisocyanate, hexamethylene diisocyanate or isophorone diisocyanate; the polyisocyanate, isopropanol and step The mass ratio of gained phenolic resin is 1~5:2~4:40~50;

[0027] ④ Add 3~8 parts of hydroxymethylcellulose sodium, 5~15 part...

Embodiment 1

[0034] An insulating coating consisting of the following raw materials: 55 kg of polyurethane modified phenolic resin, 3 kg of sodium hydroxymethyl cellulose, 5 kg of polyvinyl alcohol, 10 kg of butanol, 4 kg of methyl oleate, 5 kg of isooctanoic acid, 1 kg of magnesium hydroxide, organic Solvent toluene 50kg, film-forming aid propylene glycol methyl ether acetate 5kg, aluminum metaphosphate 2kg and pentaerythritol 2kg;

[0035] Described polyurethane modified phenolic resin obtains according to the following steps:

[0036] Mix 100kg of phenol and 5kg of sodium hydroxide, heat up to 100°C, and reflux for 20 minutes to obtain a mixed solution;

[0037] To step 126kg of furfural was added dropwise to the resulting mixed solution, and after the dropwise addition, the reflux reaction was continued at 100°C for 2 hours to obtain a phenolic resin;

[0038]③ Mix 5.775kg toluene diisocyanate, 11.55kg isopropanol and step The obtained phenolic resin is mixed evenly to obtain ...

Embodiment 2

[0040] An insulating coating consisting of the following raw materials: 65 kg of polyurethane modified phenolic resin, 8 kg of sodium hydroxymethyl cellulose, 15 kg of polyvinyl alcohol, 15 kg of butanol, 7 kg of methyl oleate, 8 kg of isooctanoic acid, 3 kg of magnesium hydroxide, organic Solvent xylene 60kg, film-forming aid ethylene glycol monobutyl ether 10kg, aluminum metaphosphate 4kg and pentaerythritol 5kg;

[0041] Described polyurethane modified phenolic resin obtains according to the following steps:

[0042] Mix 100kg of phenol and 10kg of triethylamine, heat up to 110°C, and reflux for 40 minutes to obtain a mixed solution;

[0043] To step 165kg of furfural was added dropwise to the resulting mixed solution, and after the dropwise addition, the reflux reaction was continued at 110°C for 3 hours to obtain a phenolic resin;

[0044] ③ Mix 35kg hexamethylene diisocyanate, 105kg isopropanol and step The obtained phenolic resin is mixed evenly to obtain the p...

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Abstract

The invention relates to an oil-immersed current transformer insulation discharge pulse detection device. The device comprises an opening cross-core type current sensor, the opening cross-core type current sensor is connected with a processor through signal wire, the processor is connected with a photoelectric converter through optical fiber, the photoelectric converter is connected with a USB (universal serial bus) interface, two semicircular parts are hinged to form the opening cross-core type current sensor, wherein one semicircular part is connected with the processor through a Z-shaped fixing part, and the other semicircular part can be freely opened and closed. The insulating paint has good adhesive force, the surface drying speed is fast, the peeling and seasoning crack are difficult, the impact resistance is strong, the high and low temperature resistance and water resistance are good, the insulating property is excellent and cannot be weakened as time goes by, the insulating paint has the advantages that the safety factor is high and the service life is long, and the detection device can be conveniently used for maintaining an insulated protective layer in the process of long-term use. The oil-immersed current transformer insulation discharge pulse detection device further has the advantages that the structure is simple, and the overhauling and maintenance are convenient.

Description

technical field [0001] The invention belongs to the field of power transmission and transformation, and specifically relates to an insulation discharge pulse detection device for an oil-immersed current transformer. Background technique [0002] The quality of the insulation of oil-immersed current transformers directly determines the safe and stable operation of the power grid. When almost all electrical equipment fails or has hidden dangers, the main characteristic parameters reflecting the nature of the failure, such as partial discharge, chromatogram, and temperature rise, will occur correspondingly. Among them, the most sensitive indicator is partial discharge, so detecting the partial discharge pulse of oil-paper insulation becomes an effective means to judge and evaluate its state. However, during the long-term use, it was found that the discharge detection device has potential safety hazards in the operation process: when the existing detection device needs to be sus...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R35/02
CPCG01R31/12G01R35/02
Inventor 孟庆阵徐学伟韩宝国李静鹏马驰李琦王洪富赵祥龙
Owner STATE GRID CORP OF CHINA
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