WO2007058564A1 - High-voltage pin-type insulator - Google Patents

Abstract

The invention relates to electrotechnical engineering. The inventive insulator is characterised in that the electro-insulating part thereof is made of a prestressed tracking-resistant organosilicon rubber.

Description

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HIGH VOLTAGE PIN INSULATOR

The invention relates to electrical engineering. In particular, to high voltage

voltage insulators for overhead power lines

mainly 6-35 kV.

Known high-voltage insulators, consisting of a metal cap,

firmly bonded with hardened cement-sand ligaments

glass part, and a dielectric rod located in a rigid

connection with a glass part (SU 1529296, CL. H01B17 / 20).

The closest analogue is the insulator according to the patent of the Russian Federation 2113741,

consisting of a metal cap, an insulating part made of

tempered glass, and a metal pin rigidly fixed in

insulating parts.

A significant drawback of these analogues (SU1529296, 2113741)

is the use of hardened insulating parts as material

glass as the most mechanically durable known commonly used

electrical insulating materials. Quenching provides increased

heat resistance of the glass part, resistance to compression and bending. But with

hardness and static strength of the insulator acquires properties

characteristic of any glass: fragility, low impact dynamic

strength. In addition, due to different thermal coefficient

one

Replacement sheet expansion of metal and glass, it is necessary to compensate for different values

expansion at the junction of the glass with a metal cap and

with a pin. This is done by placing damping pads, grease and

etc. Insulators with a glass part are heavy, which creates

inconvenience during installation, and also have a large percentage of battle during

transportation to the installation site, subject to vandalism.

The aim of the invention is to increase operational reliability

insulators, simplified design and reduced cost.

This result is achieved due to the fact that the high-voltage insulator

contains a metal pin (pipe), a metal cap with tools

wire fasteners, and electrical insulating part with head and ring

ribs. The insulator is characterized in that the insulating part is made

not from mechanically strong material, but rather from elastic: from

Tracking resistant silicone rubber. In this case, the head

electrical parts pressed between the pin and the metal

cap.

Highly stressed, compressed (compressed) state of rubber under

metal cap provides the necessary solid mechanical

properties of the insulating body of the insulator. Mechanical load from

metal cap downward and bending to the sides perceives

metal pin through a layer of compressed rubber. Compression achieved

imputing sheet in the following ways: 1) in the manufacture of crude rubber is injected under

pressure between cap and pin followed by vulcanization; 2)

uniform compression of vulcanized rubber through metal

cap. The second option can be applied after the first for additional

compression of vulcanized rubber under the cap of the insulator.

The insulator can be made by connecting a metal cap,

the insulating silicone part and the metal pin with these two

methods in the factory and subsequently attached directly to

transmission line support. This can be applied on newly built lines.

power transmission.

The insulator can be manufactured in the field by connecting

metal cap, silicone insulating parts made

in advance, and the metal pin existing on the support by compression

cap with a manual or mobile press used for mounting wires

Power line.

In a compressed state, rubber transfers loads downward and lateral bending

loads on the metal pin, as these loads are also directed

inside rubber for compression. Long-term efforts at the insulator directed

vertically upwards in practice do not occur. Random dance loads

wires after ice discharge are small and offset by shear

stresses in the pressed rubber. Compression of rubber in the cap creates

(imputing sheet sufficiently strong sealing of the cap on a metal pin and allows not

apply an additional retaining ring or other devices.

An insulating part made of such rubber is

a fine dielectric between the cap and the pin. Thermal resistance

such an insulator is more than 350 degrees, and is limited only

heat resistance of silicone rubber and the melting point of the cap metal

and a pin. The insulating part itself becomes damping

a gasket compensating for possible different temperature coefficients

own expansion, as well as the expansion of the material of the cap and pin.

As a result, the insulator can withstand sudden changes in temperature up to

300 degrees (thermal shock), which is an order of magnitude more than all existing

insulators. The elastic properties of the insulator and the absence of fragile parts allow

transport insulators without a fight. The absence of a glass part eliminates

vandalism against insulators and reduces the risk of execution of insulators from

weapons. Reducing the weight of the insulator saves on transportation costs.

Ring ribs (concentric plates) that are part of

electrical parts that are on the pin below the cap,

increase the creepage distance along the surface of the insulator. They may be

made at the same time with the head of the insulating part or put on

on the pin (pipe) and attached to the head of the insulating part by gluing

or vulcanization after placement and rubber under a metal cap.

Replacement sheet Use of silicone rubber c. as tracking resistant

coatings or sheaths are used in many insulators to reduce currents

leakage, hydrophobicity of the surface, but as the main only

material of the insulating part of the receptive, including mechanical

load applied for the first time.

In fig. 1 shows a General view of the device, where 1 - pin, 2 - metal

cap, 3 - electrical insulating part made of rubber, 4 - head

electrical parts pressed between the pin and the cap.

Replacement sheet

Claims

FORMULA

1. A high voltage insulator containing a pin, a metal cap with

wire fasteners and an electrical insulating part with a head and

ribs, characterized in that the insulating part is made of

Track-resistant silicone rubber, and its head is pressed between

a pin and a metal cap.

2. The insulator according to claim 1, characterized in that the electrical insulating part

made integral, its head and ring ribs are separate

elements interconnected into one.

3. The insulator according to claim 1 or claim 2, characterized in that the pin is made in the form

pipes, with a plugged hole in the direction of the head of the insulator

change sheet