Bell jar type disk-type composite insulator

Abstract

The invention discloses a bell jar type disk-type composite insulator, which is characterized by comprising a fitting seat, a binder, a toughened glass core, a coupling agent, a silicon rubber composite layer and silicon rubber extension umbrella skirt, downward-extending silicon rubber umbrella skirts composited on an inner umbrella skirt of toughened glass, a metal rod and a silicon rubber non-composited area around the metal rod. According to the invention, the silicon rubber non-composited area around the metal rod plays a role in preventing the zero-value crushing characteristic of the toughened glass from being blocked, and is favorable for routing inspection personnel of a line to find out fault points of the line immediately. Compared with the glass (ceramic) insulator of the same specification, the bell jar type disk-type composite insulator disclosed by the invention is light in weight and strong in self-cleaning capability, ensures that a power grid is free from maintenance during operation, has the advantage of reducing the operation cost of the power grid and is safe and reliable. Meanwhile, because of the large creepage distance of the single insulator, the bell jar type disk-type composite insulator is stronger in over-voltage resistance under the condition of not increasing the number of the insulator for a power transmission line, can be widely applied to 35KW-1000KW power transmission lines and has better economic benefits and social benefits.

Description

technical field [0001] The invention relates to power transmission circuits, substations and power plants, in particular to high-voltage, ultra-high-voltage and ultra-high-voltage suspension insulators, in particular to a bell-type disc-type composite insulator. Background technique [0002] Suspension insulators are important equipment for power transmission and transformation systems. Suspension insulators currently used include ceramic and glass suspension insulators, rod composite insulators and disc composite insulators. [0003] (1) Ceramic and glass suspension insulators are made of hydrophilic materials. During the operation of power lines, the surface of the insulators is prone to accumulate dirt, especially in areas with heavy environmental pollution, and the safe operation of power transmission lines will be seriously affected. There are many cases of large-scale power outages caused by pollution flashover accidents in the power grid caused by pollution in my cou...

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Problems solved by technology

(2) Rod-shaped synthetic insulators improve the anti-pollution flashover capability of power transmission systems and power generation and transformation systems, but the length of each product is relatively long, such as the synthetic insulators of 220KV transmission lines, each string is longer than two meters, and 500KV power transmission The composite insulators of the line, each string is longer than four meters, and the UHV is longer, which brings a lot of inconvenience to transportation and on-site construction

The greater risk is that the rod-shaped composite insulator string depends entirely on the glass fiber rods in it to withstand the mechanical tensile strength of 70KV-300KV. Once the glass fiber rods are damaged during transportation and construction, it will inevitably bury the safety of the power grid. Hidden dangers have also caused many accidents to the power grid due to such hidden dangers. (3) Disc-shaped composite insulators, which are new products developed and released a few years ago. The advantage is that the silicone rubber used in composite insulators is applied to ceramics or glass. On suspension insulators, it overcomes the problem of hydrophilicity of ceramic or glass insulators and improves the anti-pollution flashover capability. Pull force, wind force, etc., resulting in "zero value", which is a common accident on transmission lines. The insulator can only be detected, screened and eliminated one by one by people climbing up the tower under the power failure state. Insulators have buried potential safety hazards for the power grid for a long time

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