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Novel preparation process of surface coating layer of rod electrode in environment-friendly gas

A preparation process and surface coating technology, applied in metal material coating process, device for coating liquid on the surface, coating, etc., can solve potential safety hazards, increase equipment pressure bearing capacity and other problems, and achieve insulation performance improvement , increase thermal stability, improve the effect of dielectric properties

Inactive Publication Date: 2019-08-30
SHANGHAI POWER TRANSMISSION & DISTRIBUTION TESTING CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the gas pressure is increased, this will increase the pressure bearing capacity of the equipment, and at the same time bring hidden dangers to safety; and if the size is increased, this will put forward the opposite appeal for the relatively small footprint
Unfortunately, none of the currently known gases can match the comprehensive properties of SF6 gas in all aspects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] When the insulating layer is a nano-SiO2 / EP coating, the preparation method is as follows:

[0042] a1. Select epoxy resin EP and nano-SiO 2 Particles, curing agent, accelerator, choose SiO with a size of 20–30nm 2 particles;

[0043] b1, using a centrifugal stirrer to mix nano-SiO 2 The particles are evenly mixed in the epoxy resin EP;

[0044] c1. Accurately weigh epoxy resin EP and nano-SiO according to the mass calculated in advance 2 Pellet mixture, hardener, accelerator and pour them into clean containers;

[0045] d1. The above-mentioned container passes through the Thinky ARE-310 centrifugal agitator, first at 1000r·min –1 Stir for 5 minutes, then at 2000r·min –1 Stir for 10 minutes, then ultrasonically vibrate for 20 minutes;

[0046] e1. Put the above container into a vacuum drying oven to remove the air bubbles introduced by centrifugal stirring and material addition;

[0047] f1. The fully mixed epoxy colloid obtained from step e is divided into two ...

Embodiment 2

[0050] When the insulating layer is nano-Al 2 o 3 / EP coating, the preparation method is as follows:

[0051] a2. Weigh EP, curing agent, accelerator and Al in sequence in proportion 2 o 3 , the Al 2 o 3 The particle size is 30–40nm;

[0052] b2, fully centrifuging and ultrasonically oscillating the materials in step a;

[0053] c2, the finished product obtained in step b is transferred to a vacuum drying oven for defoaming treatment;

[0054] d2, after being processed in step c2, divide into two parts, prepare the electrode coating by the pulling coating method respectively, test the thickness of the fully cured coating by a multi-thickness meter, nanometer Al 2 o 3 The thickness of the / EP coating is 75 μm.

Embodiment 3

[0056] When the insulating layer is a ceramic coating, the preparation method is as follows:

[0057] a3. Clean and dry the stainless steel rod electrode substrate with an ultrasonic cleaner, and sandblast the surface of the rod electrode with alumina powder. The surface roughness of the rod electrode after sandblasting is about 6.3 μm;

[0058] b3, using supersonic atmospheric plasma spraying SAPS technology to 14wt%Y 2 o 3 / ZrO 2 (YSZ) spherical particles and 20wt% Al 2 o 3 / ZrO 2 (ASZ) Spherical particles are evenly sprayed on the surface of the rod electrode;

[0059] The 14wt% Y 2 o 3 / ZrO 2 (YSZ) spherical particle size is 500μm, the 20wt% Al 2 o 3 / ZrO 2 (ASZ) spherical particles with a size of 500 μm,

[0060] The SAPS system is equipped with a gun with a Laval nozzle, the length and diameter of the Laval nozzle are 44 mm and 6 mm respectively, the spray powder is injected into the plasma fixture by a syringe with a diameter of 2 mm, and the thickness of t...

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Abstract

The invention discloses a novel preparation process of a surface coating layer of a rod electrode in environment-friendly gas. The environment-friendly gas is N2 gas, the coating layer is an insulating layer, and an insulating layer is one selected from a nano SiO2 / epoxy resin (EP) coating, a nano Al2O3 / EP coating and a ceramic coating. After the surface of the rod electrode is coated with the insulating layer, breakdown strength of the rod electrode is effectively improved. When 3 wt% of the SiO2 / EP and 2 wt% of the Al2O3 / EP are used as the insulating coating, the 50% breakdown voltages (U50)are respectively 90 kV and 92 kV, so that compared with a bare electrode, the coated rod electrode has greatly increased 50% breakdown voltage (U50). According to the invention, the dielectric property of the rod electrode can be effectively improved, and meanwhile, thermal stability of the rod electrode is increased. When the composite ceramic is used as the insulating coating, the rod electrodehas good mechanical stability due to toughness of zirconium oxide.

Description

technical field [0001] The invention belongs to the technical field of novel electrode surface coating materials, and more specifically relates to a preparation process of a novel rod electrode surface coating layer in an environment-friendly gas. Background technique [0002] The power system plays a pivotal role in the city and is an indispensable and important facility for urban construction. Compared with traditional power equipment, power equipment using gas as an insulating medium can greatly reduce the footprint. Among them, gas insulated substation (GIS for short), gas insulated transformer (GIT for short), gas insulated breaker (GIB for short), and gas insulated transmission line (GIS for short) GIL) gas insulated equipment has been widely used. Thanks to SF 6 It has strong electronegativity, excellent arc extinguishing performance, good chemical stability, good thermal conductivity, and no carbon particles will be precipitated. Therefore, in gas-insulated power ...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/25C04B35/10C04B35/48C04B35/505C04B35/622B05D7/14B05D5/12B05D3/02C23C4/134C23C4/11
CPCB05D3/0254B05D5/12B05D7/14B05D2202/15B05D2504/00B05D2601/20B05D2601/22C04B35/10C04B35/48C04B35/505C04B35/62222C08K2003/2227C08K2201/011C09D5/00C09D163/00C23C4/11C23C4/134C08K3/36C08K3/22
Inventor 郭丽萍罗时聪刘剑刘志远孙竹
Owner SHANGHAI POWER TRANSMISSION & DISTRIBUTION TESTING CENT
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