Bushing Replace, High Voltage Transmission in Substation Gis Bushing

Power GIS bushing description-

ChinSun  RIP add fiber GIS bushing technical scope:


# Technical background


At present, most of the outlet bushings commonly used in 66kV~500kV combination electrical appliances are filled with SF6 gas type casing. It is composed of a conductor, a grounding electrode, an air end porcelain sleeve, SF6 gas, and a flange. Since the structural products have been put into the market, according to the on-site operation, the following problems exist:

1. There are many parts and components in this kind of casing, and the process is complicated. The product is filled with high-pressure SF6 gas. If there is internal SF6 gas leakage during operation, the pressure of SF6 gas will decrease. The pressure level of SF6 determines the level of insulation. The pressure drop will lead to the electrical insulation level of the product. Lower, resulting in a fault condition;

2. The operating pressure of SF6 gas inside such casing is generally around 0.4Mpa. In cold regions, equipment will operate in low-temperature environment. When the ambient temperature drops below _45 °C, the SF6 gas inside the casing will be liquefied at a low temperature. At this time, the internal SF6 gas pressure inside the casing is reduced, the insulation level is lowered, and internal electrical faults may occur, which may affect the operation of the line. Safety. Even if the grounding part is electrically heated, the heat conduction efficiency is low, and the problem of low-temperature liquefaction of SF6 gas inside the casing cannot be effectively solved;

3. When using such casing, it is necessary to assemble and fill the internal SF6 gas in the casing. The process is difficult and affected by the site environment. If any process details are not handled properly, the electrical performance of the product will be stabilized and sealed. reliability.


ChinSun Utility model GIS bushing details:

The technical problem to be solved by the utility model is to provide a fiber dry type GIS casing. The manufacturing process of the device is simple, the electrical performance of the product is stable, and the sealing performance is very good.

In order to solve the above problems, the utility model adopts the following technical solutions:
1- a glued fiber dry GIS sleeve comprising a conductor, an inner insulator coated on the outside of the conductor, and an outer insulator wrapped on the outside of the inner insulator, the inner insulator having a length greater than the outer insulator a length of the inner insulator extending to an outer portion of the outer insulator, a flange provided on an outer ring of the portion of the inner insulator extending to the outside of the outer insulator, the outer ring of the flange being disposed a ground terminal, a seal is formed between the flange and the outer insulator, and a pressure equalizing ball for fixing the inner insulator and the outer insulator is disposed at a position near a top of the conductor, and the inner insulator is glued RIP fiber form.

2- As a preferred technical solution, the conductor runs through the pressure equalizing ball.

3- As a preferred technical solution, the outer insulator is a composite outer insulator or a porcelain outer insulator.



ChinSun is a professional High Voltage Bushing manufacturer from China.

Strict technical standards (IEC 60137) and the shortest delivery time (20days) to win more good customers for ChinSun.

ChinSun® products range is : Dry type RIP bushings, from 12kV 36kV 66kV 72.5kV 126kV 132kV 170kV 220kV 252kV 363kV up to 400kV :Transformer bushing, Wall bushing, Current Transformer, GIS bushing.

Whether you are a transformer manufacturer or a power project or power products importer, send to us your demand specifications, we will offer it's design drawings to you with most valuable feedback.

website:  www.sdchinsun.com

What is GIS bushing?


In the power system, the outgoing sleeve used in GIS substation, the outdoor part is the porcelain bushing filled with SF6 gas. The leakage of air during operation makes the internal gas pressure drop, resulting in insulation failure and porcelain bushing explosion. In recent years, the use of composite hollow insulator instead of porcelain bushing increased year by year. Although the explosion hazard was avoided, there was still an air leakage problem, which brought a lot of maintenance work of detection machine.

Also due to the GIS for casing indoor SF6 gas performance is affected by pressure, when the environment temperature is very low, gas concentration (below 40 ºC liquefy), depress insulation performance, so in the environment temperature is low, can't use this kind of casing.

ChinSun FGRG reinforced dry GIS outgoing busing uses capacitive uniform pressure structure glass fiber impregnated with epoxy resin to enhance the wrapped solid insulation. There is no SF6 gas in the outdoor part of the bushing and there is no risk of air leakage. There is no need to test and maintain it during operation. Gas at the same time, due to the flanges and then the gas pressure station is mutually, and the plant installed in temperature control indoor, so the gas temperature within the flange is controlled, the casing can be lower than to 40 ºC under the environment of running. This product meets GB/T 4109-2008, IEC60137 ED6.0 version, MOD and other latest standards, and has the following remarkable advantages:

A. This product is a gas-free, pure solid main insulation structure product, so there is no special test and maintenance;

B. The insulation design of the sleeve has a large margin. The semiconductor material is used as the capacitive screen, which greatly increases the starting voltage of the sleeve so that there is no local discharge in operation;

C. flame retardant insulation materials, no decomposition, stable electrical properties, no combustion and explosion hazards;

D. The mechanism is compact, small in size, light in weight, easy to transport, and can be installed at any Angle;

E. glass fiber reinforced winding to optimize mechanical layering design. High bending strength and excellent mechanical performance, especially suitable for use in the severe earthquake area.

F. excellent high and low-temperature resistance, the highest temperature tolerance + 135 ºC, the minimum heat resistance - 200 ºC;

G. The silicone rubber composite coat has excellent antifouling performance and can be used in heavy pollution area;

H. Long service life and low long-term operation cost;

I. the product has a short production cycle and can be specially designed according to user requirements.