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A high arc-resistant epoxy insulating material and its preparation method, insulator

A technology of epoxy insulation and arc resistance, which is applied in the direction of organic insulators, inorganic insulators, plastic/resin/wax insulators, etc., can solve the problems of arc resistance, low voltage operation times, and easy flashover, etc. Excellent strength and arc resistance, increased number of pressurized operations, and excellent electric strength

Active Publication Date: 2018-08-28
PINGGAO GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-arc-resistant epoxy insulating material, so as to solve the problems in the prior art that the arc-resistant performance of the epoxy casting insulating parts inside the circuit breaker and the number of times of voltage operation are low, and flashover is prone to occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The high arc-resistant epoxy insulating material of this embodiment is made from the following raw materials in parts by mass: 1 part of composite epoxy resin, 0.51 part of curing agent methyltetrahydrophthalic anhydride, and 3.25 parts of alumina; composite epoxy resin is HE -A mixture of 4776 type bisphenol A epoxy resin, ER104 type bisphenol A epoxy resin, CT200M type bisphenol A epoxy resin in a mass ratio of 3.5:3.5:1.5; alumina is 10~18μm electrical α-Al 2 O 3 (A-F-3 type) and 200~400nm electrical α-Al 2 O 3 (XC-3 type) A mixture composed of a mass ratio of 1.6:1.

[0034] The preparation method of the high arc resistance epoxy insulating coating of the present embodiment comprises the following steps:

[0035] 1) Preheat the composite epoxy resin at 135°C for 0.5h, preheat the mold at 135°C for 1.5h, and preheat the curing agent at a vacuum of 2mbar and 70°C for 0.5h; after preheating, put the composite epoxy resin Mix with alumina for 0.5h at 140℃, degas at ...

Embodiment 2

[0040] The high arc-resistant epoxy insulating material of this embodiment is made of the following raw materials in parts by mass: 1 part of composite epoxy resin, 0.53 parts of curing agent methyltetrahydrophthalic anhydride, and 3.35 parts of alumina; composite epoxy resin is HE -A mixture of 4776 type bisphenol A epoxy resin, ER104 type bisphenol A epoxy resin, CT200M type bisphenol A epoxy resin in a mass ratio of 4:4:1.8; alumina is 10~18μm electrical α-Al 2 O 3 (A-F-3 type) and 200~400nm electrical α-Al 2 O 3 (XC-3 type) A mixture composed of a mass ratio of 1.8:1.

[0041] The preparation method of the high arc resistance epoxy insulating coating of the present embodiment comprises the following steps:

[0042] 1) Preheat the composite epoxy resin at 145°C for 1.5h, the mold at 145°C for 2.5h, and the curing agent at a vacuum of 5mbar and 80°C for 0.5h; after preheating, the composite epoxy resin Mix with alumina for 0.5h at 150℃, degas at 7mbar vacuum and 150℃ for...

Embodiment 3

[0047] The high arc-resistant epoxy insulating material of this embodiment is made of the following raw materials by mass: 1 part of composite epoxy resin, 0.55 part of curing agent methyltetrahydrophthalic anhydride, and 3.45 parts of alumina; composite epoxy resin is HE -A mixture of 4776 type bisphenol A epoxy resin, ER104 type bisphenol A epoxy resin, CT200M type bisphenol A epoxy resin in a mass ratio of 4.5:5:2; alumina is 10~18μm electrical α-Al 2 O 3 (A-F-3 type) and 200~400nm electrical α-Al 2 O 3 (XC-3 type) A mixture composed of a mass ratio of 2:1.

[0048] The preparation method of the high arc resistance epoxy insulating coating of the present embodiment comprises the following steps:

[0049] 1) Preheat the composite epoxy resin at 140°C for 1h, the mold at 140°C for 2h, and the curing agent at 3mbar vacuum and 75°C for 0.5h; after preheating, the composite epoxy resin and oxidized Aluminum was mixed at 145°C for 0.5h, and then degassed at a vacuum of 5mbar ...

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Abstract

The invention discloses a high-arc resistance epoxy insulating material and a preparation method thereof and an insulator. The epoxy insulating material is prepared from the following raw materials in parts by mass: 1 part of composite epoxy resin, 0.51-0.55 part of curing agent methyl tetrahydrophthalic anhydride and 3.25-3.45 parts of aluminum oxide, wherein the composite epoxy resin is a mixture of phenolic aldehyde modified bisphenol A epoxy resin, polyethylene glycol modified bisphenol A epoxy resin and diphenolic acid modified bisphenol A epoxy resin. The epoxy insulating material is equivalent to traditional materials in glass-transition temperature, tensile strength and electric strength, the arc resistance reaches 237s, and after a 252kV circuit breaker is switched on / off under voltage for over 3243 times, flashover appears behind; and the epoxy insulating material has excellent arc resistance, the operation times of a high-voltage circuit breaker under voltage is remarkably increased, the service lives of internal epoxy insulating components are prolonged and reliability of the internal epoxy insulating components is improved, and the maintenance and overhauling cost of a power station is reduced.

Description

technical field [0001] The invention belongs to the technical field of electrical insulating materials, and in particular relates to a high-arc-resistant epoxy insulating material, a preparation method thereof, and an insulator. Background technique [0002] Epoxy cast insulating parts in AC high-voltage circuit breakers are generally used outside the arc extinguishing chamber and inside the circuit breaker. They are generally used as isolation parts between the arc extinguishing chamber and the two ends of the circuit breaker cylinder, and mainly play an important role in insulation and support. During the breaking process of the arc extinguishing chamber of the circuit breaker, a small amount of arc overflows to the area outside the arc extinguishing chamber and inside the circuit breaker, resulting in the rapid decline of the insulation performance of the epoxy cast parts exposed to the overflow arc for a long time after repeated breaking, and then Plus SF 6 Due to the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08K3/22H01B3/40H01B3/10
CPCC08K2201/003C08K2201/011C08L63/00C08L2205/02H01B3/10H01B3/40C08K2003/2227
Inventor 田浩李继承袁端鹏林生军吴明清杨保利侯亚峰
Owner PINGGAO GRP
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