CN2058269U

CN2058269U - High pressure socketed tube

Info

Publication number: CN2058269U
Application number: CN 89219052
Authority: CN
Inventors: 黄维枢; 王如璋; 谢一帆
Original assignee: Electric Power Research Institute Of Ministry Of Energy
Current assignee: Electric Power Research Institute Of Ministry Of Energy
Priority date: 1989-12-30
Filing date: 1989-12-30
Publication date: 1990-06-13

Abstract

The utility model relates to a novel high pressure casing pipe, which is suitable for the leading-out terminals of electric facilities whose voltage level is 35 kV and above 35 kV, such as wall casing pipes, cable terminals, transformers, mutual inductors, etc. Compared with the existing high pressure casing pipe, the novel high pressure casing pipe has uniform voltage distribution along the surface, light structure, simple maintenance, convenient transportation, and low cost, and the flashover is not easy to happen and the novel high pressure casing pipe is not easy to be damaged. A 110 kV casing pipe costs about 30 hundreds RMB, and the weight of one casing pipe is about 40 kg.

Description

High pressure socketed tube

The utility model relates to a kind of bushing, belongs to high voltage electric appliance.

At present, the bushing on the domestic and international market is porcelain bushing, generally is made up of several parts such as leading core, insulator, insulating oil, conservator.Diametral voltage mainly by leading core insulation and insulating oil is born, is axially mainly born by insulator along face voltage.Because the influence of electrode shape, it is very inhomogeneous to distribute along face voltage, and common 40%～50% voltage is distributed in head and root, and often easy flashover causes the accident.For this reason, manufacturing firm all addresses this problem by increasing creep distance both at home and abroad, brings very big difficulty but increase creep distance to manufacturing.In addition, present bushing price is expensive, and weight is big.As every about 7～8,000 yuan of the bushings of 110kv, heavily about 200～300kg, this kind sleeve pipe, insulator easily damages, transportation difficulty, leakage of oil easily, operation maintenance inconvenience.

The purpose of this invention is to provide and a kind ofly be evenly distributed along face voltage, cost is low, weight is little, flexible for installation, operation maintenance simple, the bushing of convenient transportation.

The profile of novel high-pressure sleeve pipe and structure are as shown in Figure 1, leading core (1-2), solid insulating layer (1-3), capacitance plate layer (1-4), crust (1-5) etc. by terminals (1-1), metal forms, metal is led core and is surrounded by solid insulating layer outward, at solid insulating layer external application insulating material fixing metal capacitance plate layer, metal capacitance screen layer is by n (n=1,2,3 ...) successively with the fixing composition of insulating material, the parameters relationship relevant with capacitance plate is as follows vertically for capacitance plate:

A. the insulation thickness of capacitance plate is d, and this thickness is relevant with the number of electric pressure, the insulating material of selecting for use and capacitance plate.

B. maintain a certain distance l between capacitance plate vertically, this distance is relevant with the number along face characteristic and capacitance plate of electric pressure, selected solid insulating material.

C. lead core near the 1st capacitance plate of terminal portions with metal and link to each other, all within one meter, the length of other each capacitance plate increases progressively according to the conic section of the 2nd screen length by n the length of the 1st screen and the 2nd screen.

D. draw an earth terminal from the n screen, and can use for monitoring.

The crust of bushing is made with anti-aging, uvioresistant, arc resisting hydrophobicity insulating material.

The bushing of said structure because all pressures effect of capacitance plate and the hydrophobicity of skin material make insulation and anti-soil characteristic good, because of having used the good insulation material, make insulation level height between screen, and anti-corona ability is strong.Compare with existing bushing and to have saved insulator, and make structure light and handy, not fragile, operation maintenance is simple, convenient transportation, and low price, as every about 3,000 yuan of 110kv sleeve pipes, heavily about 40kg.

This novel high-pressure sleeve pipe can be used as the leading-out terminal of electric equipments such as the terminal, transformer, instrument transformer of wall bushing, the cable of 35kv and above electric pressure.

Fig. 1 illustrates the wall bushing embodiment that is the 63kv that leads core of cable core.Its main manufacture method is as follows:

Select for use the cable core of interlinkage Polyethylene insulated cable to do metal and lead core, the insulating barrier of this cable is done solid insulating layer, and the aluminium pool is done capacitance plate, teflin tape is done the insulating material between capacitance plate.This kind of is the A type, if the insulating material of making between capacitance plate of mica paper tape then is a Type B.

Intercept the interlinkage Polyethylene insulated cable of certain-length as required, peel off crust and semiconductor layer, expose insulating barrier.One section insulating barrier is respectively removed at the cable two ends again, exposes cable core, and cable core is pressed into copper tip.With the 1st screen with lead core and be connected, other each screen number is processed into the aluminium pool and number corresponding length according to each screen in the table 1, thickness d according to insulating material between position of shielding in the table and capacitance plate is 0.8 millimeter, vertically distance is 60 millimeters a relation between capacitance plate, after the cable insulation laminar surface was coated with silicone grease, round each number of the looping capacitance plate of teflin tape (or mica paper tape) of smearing silicone grease (or silicone oil) with the surface shielded until the end.5～10 circles are twined with the multiply bare copper wire in Bao Zhimo screen middle part, wear plastic tube and draw earth terminal and can be for monitoring usefulness, and last appearance is with the thermoplastic tube one deck that contracts.

Ln is the effective length of capacitance plate.

The type approval test of the said goods, scrubbing tolerance performance does not have outside the national standard, and all other indexs all can reach the IEC request of national standard, see Table 2.

Fig. 2 illustrates the embodiment that bushing is done cable terminal, chooses suitable length at cable end, peels off crust and semiconductor layer, other method for production and last same.

Reference numeral:

Fig. 1 .1-1 terminals; 1-2 leads core; The 1-3 solid insulating layer;

The 1-4 capacitance plate; The 1-5 crust.

Fig. 2 .2-1 cable; The 2-2 bushing.

Table 1

Table 2

Claims

1, a kind of novel high-pressure sleeve pipe, leading core (1-2), insulating barrier, crust (1-5) etc. by terminals (1-1), metal forms, it is characterized in that metal leads core outsourcing solid insulating layer (1-3), outside solid insulating layer, use insulating material fixing metal capacitance plate layer (1-4) vertically.

2, bushing according to claim 1 is characterized in that metal capacitance screen layer is by n (n=1,2,3 ...) successively with the fixing composition of insulating material, the parameters relationship relevant with capacitance plate is as follows vertically for capacitance plate:

A. the insulation thickness between capacitance plate is d, and this thickness is relevant with the number of electric pressure, the insulating material of selecting for use and capacitance plate;

B. maintain a certain distance l between capacitance plate vertically, this distance is relevant with the number along face characteristic and capacitance plate of electric pressure, selected solid insulating material;

C. lead core near the 1st screen of terminal portions with metal and link to each other, all within one meter, the length of other each capacitance plate increases progressively according to the conic section of the 2nd screen length by n the length of the 1st screen and the 2nd screen;

D. draw an earth terminal from the n screen, and can use for monitoring.

3,, it is characterized in that the crust of bushing makes with anti-aging, uvioresistant, arc resisting hydrophobicity insulating material according to claim 1,2 described bushings.