CN202797804U

CN202797804U - Low-cost shielded casing tube with function of oil leakage prevention

Info

Publication number: CN202797804U
Application number: CN 201220373939
Authority: CN
Inventors: 何俊凌
Original assignee: SHANGHAI XIONGRUN RESIN CO Ltd
Current assignee: SHANGHAI XIONGRUN RESIN CO Ltd
Priority date: 2012-07-31
Filing date: 2012-07-31
Publication date: 2013-03-13
Anticipated expiration: 2022-07-31

Abstract

Disclosed in the utility model is a low-cost shielded casing tube with the function of oil leakage prevention. The casing tube is composed of a casing tube body and semiconductive varnish; and the semiconductive varnish is covered on the outer wall of the middle section of the casing tube body. At least one annular groove is arranged on the inner wall of the casing tube body, so that the oil leakage from the inner wall of the tube body in the transformer can be effectively prevented. Besides, the surface resistivity of the semiconductive varnish is between 103 ohmm to 1011 ohmm, so that partial discharging can be effectively prevented. According to the utility model, the shielded casing tube is used to replace a traditional induction type casing tube, thereby effectively reducing the manufacturing cost; and good shielding effects for partial discharging and point discharging can be realized. Meanwhile, the groove processing is carried out on the inner wall of the tube body, thereby effectively preventing the oil leakage of the transformer and thus realizing security and environment protection performances.

Description

Low-cost anti-oil leakage protected type sleeve pipe

Technical field

The utility model relates to a kind of high pressure resistant structure, is specially the anti-oil leakage protected type sleeve pipe of a kind of low cost for the wind power generation mask voltage.

Background technology

[0002] to (isolated conductor) when conductive surface has electric charge accumulation, charge density is relevant with the shape of conductive surface, approaches zero in recessed position charge density, and is little at mild position, maximum at the position of point; After charge density reaches certain value, the electric field of charge generation can be very large, to such an extent as to air breakdown (ionization), airborne and the charged opposite ion of conductor can with the charging neutrality of conductor, discharge spark appears, and can hear discharging sound, and such as high-voltage line the place of profile being arranged, point discharge will appear, owing to receive on the power supply, its edge discharge, Yi Bian the electric charge that ceaselessly provides discharge to need, this discharge can continue.

Copper bar claims again copper bus-bar or copper bus-bar, made by copper material, the cross section is the long conductor of rectangle or chamfering (fillet) rectangle, in circuit, play a part to carry electric current and be connected electric equipment, copper bar puts in the contact position out-of-flatness of transformer, can cause point discharge, and be accompanied by noise.

Traditional copper bar sleeve pipe has the induction type sleeve pipe, outside at the copper bar sleeve pipe is provided with metal shell usually, when the staff operates the copper bar of sleeve pipe and inside pipe casing, will open this metal shell first, and this metal-back cognition is charged, abnormally dangerous because of the point discharge of inner copper bar.

Therefore, design a kind of device that can shield the point discharge of this copper bar, do not seem extremely important so that outside metal shell is charged.

Existing sleeve pipe mainly is by insert wire netting in body, as shown in Figure 1, with the ground hole ground connection on the wire netting, to solve the partial discharge problem, China Patent No. is embedded with wire netting for a kind of protected type sleeve pipe that ZL200820155546.4 provides in the casing pipe body wall, this wire netting is copper mesh, be provided with earth terminal, the electric field that occurs in the junction of copper bar and transformer can cover by this grounding copper screen, and has eliminated the tip; But this structure is so that the manufacturing cost of sleeve pipe improves greatly, and internal surface of sleeve pipe is smooth inner wall simultaneously, has the problem of transformation oil leakage.

Summary of the invention

In order to solve problems of the prior art and deficiency, the utility model provides a kind of low cost to prevent oil leakage protected type sleeve pipe, has the advantages such as anti-partial discharge, anti-oil leakage, has reduced simultaneously the sleeve pipe manufacturing cost.

The purpose of this utility model realizes by the following technical solutions:

Low-cost anti-oil leakage protected type sleeve pipe is made of sleeve pipe body, semiconductive varnish, and the semiconductive painting brush is provided with annular groove on the sleeve pipe inboard wall of tube body on the outer wall of sleeve pipe body middle part.

Described sleeve pipe body has annular groove on its inwall, and annular groove has one at least, can prevent effectively that oil body spills along inboard wall of tube body in the transformer.

Described semiconductive varnish, its surface resistivity can effectively prevent partial discharge between 103～1011 Europe rice, can reduce simultaneously to generate 10%.

The utility model adopts the protected type sleeve pipe to replace traditional induction type sleeve pipe, can effectively reduce manufacturing cost, and partial discharge and point discharge shielding are good, simultaneously inboard wall of tube body is done groove and processes, and can effectively prevent the oil leakage of transformer, safety and environmental protection.

Description of drawings

Fig. 1 is existing sleeve structure schematic diagram;

Fig. 2 is adopted protected type sleeve pipe one example structure schematic diagram by the utility model.

Among the figure: 1-sleeve pipe body, 2-semiconductive varnish, 3-groove, 4-wire netting, 10-inboard wall of tube body, 31-ground hole.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described.

As shown in Figure 1, low-cost anti-oil leakage protected type sleeve pipe is made of sleeve pipe body, semiconductive varnish, and the semiconductive painting brush is provided with annular groove on the sleeve pipe inboard wall of tube body on the outer wall of sleeve pipe body middle part.

Further, described sleeve pipe body has annular groove on its inwall, annular groove has one at least, and preferably, annular groove is two or more, distance between groove is preferably equidistantly, can prevent effectively that oil body spills along inboard wall of tube body in the transformer.

Further, described semiconductive varnish, its surface resistivity can effectively prevent partial discharge between 103～1011 Europe rice, can reduce simultaneously to generate 10%.

Claims

1. low-cost anti-oil leakage protected type sleeve pipe comprises the sleeve pipe body, it is characterized in that, also comprises semiconductive varnish, and the semiconductive painting brush is provided with annular groove on the sleeve pipe inboard wall of tube body on the outer wall of sleeve pipe body middle part.

2. the anti-oil leakage protected type sleeve pipe of low cost according to claim 1 is characterized in that described annular groove has one at least.

3. the anti-oil leakage protected type sleeve pipe of low cost according to claim 1 is characterized in that, described semiconductive varnish, and its surface resistivity is between 103～1011 Europe rice.