CN116206834A - Lightning arrester based on Parylene coating and coating processing method - Google Patents

Abstract

The invention discloses a arrester based on a Parylene coating and a coating processing method, wherein the arrester based on the Parylene coating comprises an arrester and the Parylene coating, wherein the Parylene coating is coated on a valve core column and a composite jacket of the arrester, and the electric field distribution of the arrester during operation is improved and the insulation performance of the arrester is improved through the advantages of water resistance, corrosion resistance, good electrical performance and the like of the Parylene coating.

Description

A kind of arrester and coating processing method based on Parylene coating

technical field

The invention relates to the technical field of lightning arresters, in particular to a Parylene coating-based lightning arrester and a coating processing method.

Background technique

Surge arresters, sometimes called overvoltage protectors, are used to protect various electrical equipment in power systems from overvoltage damage. Surge arresters are usually connected between wires and ground wires, and lead the high transient overvoltage of the circuit to the ground during operation, so as to prevent electrical equipment from being damaged by the impact of overvoltage.

The arrester works outdoors for a long time. Although it is protected by a synthetic jacket, the synthetic jacket is easily affected by the environment, including high temperature, rain, snow or saline-alkali coverage. When the surface of the arrester jacket is seriously polluted, the voltage distribution will be very uneven. , may burn out the parallel resistance and cause failure, seriously affecting the insulation performance of the arrester.

During the potting process of the arrester, the gap between the spool post and the composite casing is potted with low molecular weight silicone rubber. The purpose of using silicone rubber potting is to better fix the spool column and increase the insulation resistance value. Although silicone rubber has good waterproof and sealing properties, it cannot effectively insulate steam or oil with relatively small molecular weight. And silicone rubber does not adhere well to other materials.

Contents of the invention

In order to overcome the above-mentioned problems in the prior art, the object of the present invention is to propose a Parylene-based arrester and coating processing method, which can improve the insulation performance of the arrester and prolong the service life of the arrester.

In order to solve the above problems, the present invention adopts the following technical solutions:

A kind of lightning arrester based on Parylene coating, comprising lightning arrester and Parylene coating; Said lightning arrester is a metal oxide surge arrester with composite jacket, and said Parylene coating is HT type Parylene coating; Described Parylene coating is coated on lightning arrester composite jacket The surface and the surface of the spool post, the Parylene coating coated on the surface of the spool post fills the gaps in the resistor stack and makes the silicone rubber and the spool post better adhered, the Parylene coating connects the spool post to the interior of the arrester Existing water molecules or stain molecules are isolated; the Parylene coating coated on the surface of the arrester's composite jacket improves the electrical performance of the arrester.

The raw material for preparing the HT type Parylene coating is 1,1,2,2,9,9,10,10-octafluoro-p-xylene ring dimer.

The thickness of the HT type Parylene coating is 10-50 μm.

A kind of coating processing method based on the lightning arrester of Parylene coating, comprises the steps:

The first step is surface pretreatment of arrester parts: first, sandblasting pretreatment is performed on the surface of arrester parts, and polishing and deburring are performed on the surface;

The second step, ultrasonic cleaning: Soak the pretreated arrester parts, perform ultrasonic cleaning, rinse with clean water, dehydrate, and then dry; then activate the surface of the dried arrester parts with a coupling agent ;

The third step is to coat the valve core column: use the vapor deposition method to coat the Parylene film on the valve core column. The specific method is: the Parylene raw material is heated to sublimation in the sublimation furnace, and the sublimated gas enters the cracking furnace and is cracked into monomers. Then the generated monomer is sent to the vacuum deposition chamber below 0°C for polymerization and deposition on the valve core column, and the remaining gas is recovered through the cold trap;

The fourth step, potting after assembly: Assemble the parts of the arrester, fix the resistance piece with epoxy resin on the spool column of the arrester, put the low molecular weight silicone rubber into the vacuum tank to evacuate, and wait for the bubbles in the rubber liquid After completely escaping, pour the rubber liquid into the cavity between the spool column and the composite jacket of the arrester in time to form the rubber;

The fifth step, the coating of the composite jacket of the arrester: use the gas phase deposition method to coat the Parylene film on the composite jacket of the arrester. The specific method is: the Parylene raw material is heated to sublimation in the evaporation chamber of the sublimation furnace, and the sublimated gas enters the cracking chamber of the cracking furnace for cracking The resulting monomer is then sent to a vacuum deposition chamber at room temperature for polymerization deposition on the composite jacket of the arrester, and the remaining gas is recovered through a cold trap.

The third step and the fifth step should be carried out in special deposition equipment, which includes a sublimation furnace, a cracking furnace, a deposition chamber, a cold trap and a vacuum pump arranged in sequence.

Compared with the prior art, the present invention has the following beneficial technical effects:

After the composite jacket of the arrester is coated with Parylene coating, the electrical performance of the arrester is improved, such as the dielectric constant and dielectric loss factor are reduced. Thermal stability and weather resistance are significantly improved, and the composite jacket has low gas permeability and low moisture absorption, as well as chemical stability.

After the surface of the spool post formed by stacking resistance sheets is coated with Parylene coating, the gaps in the stack of resistance sheets are filled, and the silicone rubber and the spool post can be better adhered. The coating isolates the spool column from the water molecules or other dirt molecules inside the arrester, preventing the resistors from being burned due to water or dirt affecting the voltage distribution.

Metal oxide surge arresters with insulating composite jackets work in outdoor environments for a long time and are greatly affected by the environment. Although the surge arrester is regularly inspected and the surface of the composite jacket is cleaned, after the coating is applied, the arrester can maintain better performance in the period of approaching inspection and cleaning, and even extend the cycle of inspection and cleaning.

Description of drawings

FIG. 1 is a schematic structural diagram of a Parylene coating-based arrester provided by the present invention.

Fig. 2 is a flow chart of the coating processing method of the arrester based on the Parylene coating.

Figure 3 is a schematic diagram of coating processing equipment.

Detailed ways

In order to understand the technical solutions provided by the present invention more clearly, further description will be given below in conjunction with the accompanying drawings and specific implementation cases.

A Parylene coating-based lightning arrester comprises a lightning arrester and a Parylene coating.

The arrester is a metal oxide arrester with a composite jacket, and the Parylene coating is coated on the surface of the arrester composite jacket and the surface of the spool post to improve the insulation performance of the arrester and increase the service life of the arrester.

The Parylene coating is HT type Parylene.

The raw material for the preparation of the HT type Parylene is 1,1,2,2,9,9,10,10-octafluoro-p-xylene ring dimer (AF4).

The thickness of the HT type Parylene coating is 10-50 μm.

As shown in Figure 1, the arrester coated with Parylene coating in this embodiment includes a spool post 1 formed by stacking resistance plates, a Parylene coating 2 on the spool post, and a composite casing 3 of the arrester covering the spool post 1 , Parylene coating on the arrester composite jacket 4.

Example:

As shown in Figure 2, the above-mentioned lightning arrester based on Parylene coating and the coating processing method are as follows, including the following steps:

The first step, surface pretreatment of arrester parts: first, sandblasting pretreatment is carried out on the surface of arrester parts, and pre-operations such as polishing and deburring are carried out on the surface. After passing the acceptance, the next step is processed;

The second step, ultrasonic cleaning: heat-dip the parts after the pretreatment in the previous step to soften, separate and dissolve the pollutants on the parts. Put the parts into the ultrasonic cleaning machine for 3-5 minutes, then rinse with flowing water and dehydrate, then dry with hot air or steam; then activate the surface of the dried arrester parts with a silane coupling agent Processing; after passing the acceptance, proceed to the next step of processing;

The third step is to coat the valve core column: the valve core column is coated with Parylene film by vapor deposition method. The specific method is: 1, 1, 2 , 2,9,9,10,10-octafluoro-p-xylene ring dimer raw materials are gasified in a sublimation furnace. The raw material after gasification enters a cracking furnace with a temperature of 630-670°C and a pressure of 50-67Pa, and is cracked at high temperature to become a gaseous active intermediate. The gaseous active intermediate enters a deposition chamber with a valve core column at a temperature below 0°C and a pressure of 10-13.3Pa for polymerization reaction, thereby forming a Parylene film on the surface of the valve core column. The deposition rate is 0.1-5 μm/h. Finally, the cold trap is used to collect the unreacted gas and protect the vacuum pump during the reaction.

The fourth step, potting after assembly: Assemble the parts of the arrester, fix the spool column of the arrester with epoxy resin, put the low molecular weight silicone rubber into a vacuum tank for vacuuming, and wait until the bubbles in the rubber liquid completely escape , Immediately perfusion to make it shape.

The fifth step, coating the composite jacket of the arrester: use the vapor deposition method to coat the composite jacket of the arrester with Parylene film. The 1, 1, 2, 2, 9, 9, 10, 10-octafluoro-p-xylene ring dimer raw material is gasified in a sublimation furnace under a vacuum condition with a temperature of 130-170°C and an air pressure of 100-133Pa. The raw material after gasification enters a cracking furnace with a temperature of 630-670°C and a pressure of 50-67Pa, and then cracks at a high temperature to become an active intermediate. The gaseous active intermediate enters into a deposition chamber with a temperature below 0°C and an air pressure of 10-13.3Pa where the lightning arrester composite jacket is placed for polymerization reaction, thereby forming a Parylene film on the surface of the composite jacket. The deposition rate is 0.1-5 μm/h. Finally, the cold trap is used to collect the unreacted gas and protect the vacuum pump during the reaction.

The third and fifth steps are to be carried out in dedicated deposition equipment. The schematic diagram of the equipment is shown in Figure 3, including a sublimation furnace, a cracking furnace, a deposition chamber, a cold trap and a vacuum pump arranged in sequence. This process needs to be carried out under vacuum conditions, so the equipment needs to be evacuated with a vacuum pump.

Claims (5)

1. A lightning arrester based on Parylene coating, characterized in that: comprise lightning arrester and Parylene coating; Described lightning arrester is a compound jacket metal oxide lightning arrester, and described Parylene coating is HT type Parylene coating; Described Parylene coating Coated on the surface of the surge arrester composite jacket and the surface of the spool post, the Parylene coating coated on the surface of the spool post fills the gaps in the stack of resistors and makes the silicone rubber and the spool post better adhered to. The Parylene coating will The spool column is isolated from the water molecules or dirt molecules existing inside the arrester; The Parylene coating coated on the surface of the arrester's composite jacket improves the electrical performance of the arrester. 2. The lightning arrester based on Parylene coating according to claim 1, characterized in that: the preparation raw materials of the HT-type Parylene coating are 1, 1, 2, 2, 9, 9, 10, 10-8 Fluoro-p-xylene ring dimer. 3. The arrester based on Parylene coating according to claim 1, characterized in that: the thickness of the HT-type Parylene coating is 10-50 μm. 4. the coating processing method of a kind of arrester based on Parylene coating described in any one of claim 1 to 3, it is characterized in that: comprise the steps: The first step is surface pretreatment of arrester parts: first, sandblasting pretreatment is performed on the surface of arrester parts, and polishing and deburring are performed on the surface; The second step, ultrasonic cleaning: Soak the pretreated arrester parts, perform ultrasonic cleaning, rinse with clean water, dehydrate, and then dry; then activate the surface of the dried arrester parts with a coupling agent ; The third step is to coat the valve core column: use the vapor deposition method to coat the Parylene film on the valve core column. The specific method is: the Parylene raw material is heated to sublimation in the sublimation furnace, and the sublimated gas enters the cracking furnace and is cracked into monomers. Then the generated monomer is sent to the vacuum deposition chamber below 0°C for polymerization and deposition on the valve core column, and the remaining gas is recovered through the cold trap; The fourth step, potting after assembly: Assemble the parts of the arrester, fix the resistance piece with epoxy resin on the spool column of the arrester, put the low molecular weight silicone rubber into the vacuum tank to evacuate, and wait for the bubbles in the rubber liquid After completely escaping, pour the rubber liquid into the cavity between the spool post and the composite jacket of the arrester in time to form the rubber. The fifth step, the coating of the composite jacket of the arrester: use the gas phase deposition method to coat the Parylene film on the composite jacket of the arrester. The specific method is: the Parylene raw material is heated to sublimation in the evaporation chamber of the sublimation furnace, and the sublimated gas enters the cracking chamber of the cracking furnace for cracking The resulting monomer is then sent to a vacuum deposition chamber at room temperature for polymerization deposition on the composite jacket of the arrester, and the remaining gas is recovered through a cold trap. 5. The coating processing method according to claim 4, characterized in that: the third step and the fifth step will be carried out in a dedicated deposition equipment, and the dedicated deposition equipment includes a sublimation furnace, a cracking furnace, and a deposition chamber arranged in sequence chamber, cold trap and vacuum pump.

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