WO2017025037A1

WO2017025037A1 - Insulation sleeve and insulation pipe

Info

Publication number: WO2017025037A1
Application number: PCT/CN2016/094407
Authority: WO
Inventors: 马斌; 方江; 朱兴祥; 杨礼斌
Original assignee: 江苏神马电力股份有限公司
Priority date: 2015-08-11
Filing date: 2016-08-10
Publication date: 2017-02-16
Also published as: CN105139979A

Abstract

Disclosed are an insulation sleeve (1000) and an insulation pipe (101). The insulation sleeve (1000) comprises: an insulator (110), which insulator (110) includes an umbrella skirt part (112) in the middle and a lower flange (114) on a lower end of the umbrella skirt part (112); a head part (120), which comprises an oil conservator (121) connected to an upper end of the insulator (110) and a connection terminal (122) connected to the oil conservator (121); and a tail part (100) connected to a lower end of the insulator (110), which tail part (100) has the insulation pipe (101). The insulation pipe (101) is of a glass fibre-reinforced plastic, and the insulation pipe (101) can be made by means of technologies such as filament winding and resin casting. The insulation sleeve (1000) and the insulation pipe (101) have a more convenient connection, solve the difficulty in sealing, have a good sealing effect, and save costs.

Description

Insulating sleeve and insulating tube

Technical field

The invention relates to a power transmission device, in particular to an insulation sleeve and an insulation tube.

Background technique

In the transmission equipment, the insulating sleeve is a connecting component of the power transmission and transformation equipment and the external circuit; the voltage level and operating current of the insulating sleeve are determined by the rated voltage and current value of the power transmission and transformation equipment; The structure should have good electrical performance and sufficient mechanical strength to ensure long-term normal operation of power transmission and transformation equipment.

The insulating sleeve includes an insulator and an insulating tube at the lower end of the insulator. The insulating tube is a porcelain tube. Some transformers are required for the installation of transformers, and the transformer tubes are metal cylinders. The common connection method is spring-tight, and the metal cylinder, the insulating tube and the insulator are pressed together by a strong spring through the electric conductor, and the connection force provided by the spring is between 25 and 70 kN. A sealing groove is formed on the lower end of the insulator and the metal cylinder, and is sealed by an O-ring. The connection structure is characterized by a relatively complicated structure and is manually assembled, and cannot be automated, so the efficiency is not high. And the sealing ring is used for sealing in many places, and there is a hidden danger in sealing.

Summary of the invention

In view of the deficiencies of the prior art, one of the objects of the present invention is to provide an insulating sleeve which can make the connection more convenient and solve the problem of sealing difficulty.

In order to achieve the above object, the technical means adopted by the present invention are as follows: an insulating sleeve comprising: an insulator comprising an intermediate shed portion and a lower flange attached to a lower end of the shed portion; the head including the connection a oil pillow at an upper end of the insulator, and a terminal connected to the oil pillow; a tail portion connected to a lower end of the insulator, the tail portion including an insulating tube; the insulating tube is made of FRP. The insulating tube can be manufactured by a process such as filament winding or resin casting.

The insulating sleeve is made of glass fiber reinforced plastic. When the insulating tube is installed, the insulating tube of FRP can be easily connected with other materials such as metal flanges and metal cylinders. Compared with the porcelain insulating tube of the prior art, the insulating tube of the FRP material of the present invention can be mounted and connected by various means such as plastic binding, and the porcelain insulating tube is very difficult to connect and is not easy to seal. The connection surface of the insulating tube of FRP can be easily processed, and the sealing groove can be conveniently set and the sealing ring can be added. Therefore, compared with the porcelain insulating tube, The insulating tube of the present invention can be conveniently sealed. The insulating tube of the invention has convenient installation and connection, good sealing effect, reduces the difficulty of installation and sealing, and saves cost.

Preferably, the insulating tube is sealingly connected to the lower end of the insulator. The insulating tube may be directly sealed and connected to the lower flange of the insulator, or may be sealed to the metal cylinder connected to the lower end of the insulator if the lower end of the insulator is provided with a metal cylinder. Compared with the prior art vacuum connection method, the insulating tube of the present invention can be directly sealed and connected to the lower end of the insulator without fixing the insulating tube to the lower end of the insulator by means of a spring and an electric conductor, and the connection and installation are convenient. It reduces the difficulty of equipment assembly and saves costs.

Preferably, the tail portion further comprises a metal cylinder, the upper portion of the metal cylinder is connected to the lower flange, and the lower portion is connected to the insulating tube. The metal cylinder is used as a transformer cylinder, and the outer side of the metal cylinder can be sleeved with a transformer coil. The metal cylinder can be bolted to the bottom of the lower flange.

More preferably, the insulating tube is adhesively attached to the metal can. Since the insulating tube is made of FRP, it can be directly joined to the metal cylinder by means of glue. The connection method of the plastic binding only needs to apply the resin glue to the connected parts when the connection is made, and the metal tube and the insulating tube are butted together, and the glue is solidified to complete the binding, and it is not necessary to be fastened by springs, electric conductors, etc. , greatly simplifying the installation and reducing the difficulty of installation. And the connection is made by glue, and the sealing effect is good. In addition, the connection by means of glue can increase the mechanical properties of the connection of the device, avoiding the influence of external forces, and causing problems in the seal due to damage or misalignment at the joint.

More preferably, the metal cylinder is connected to the insulating tube by an interference fit. By heating the metal cylinder, the cylinder diameter of the metal cylinder will increase due to the thermal expansion and contraction effect. At this time, the metal cylinder is sleeved on the insulating tube and cooled, and the metal cylinder diameter is gradually reduced due to the metal. The diameter of the barrel connection and the diameter of the connection of the insulating tube are tightly fitted. When the diameter of the cooling metal cylinder is contracted, the metal cylinder is tightly fixed on the insulating tube. By means of the connection of the interference fit, the metal tube and the insulating tube can be easily connected without fixing the spring and the electric conductor in the prior art. The interference fit is more tightly connected and achieves a very good sealing effect.

Preferably, an inner liner layer is disposed in the insulating tube. The inner liner can effectively prevent the oil in the equipment from corroding the insulating tube, and also prevent the corroded dissolved matter from polluting the oil.

Preferably, the insulating tube is coated with an insulating varnish. The insulating varnish can prevent the outer surface of the insulating tube from coming into contact with the oil in the equipment, causing corrosion and avoiding contamination of the oil by the dissolved dissolved matter.

Preferably, the insulating tube is formed by winding a fiber impregnated resin. The insulating tube is manufactured by the above-mentioned wet winding method, and a FRP insulating tube excellent in mechanical properties can be manufactured, and the insulating tube manufactured by the winding method of the present invention is convenient to manufacture and saves manufacturing cost compared with the prior art ceramic burning technique. . The above fibers may be glass fibers or aramid fibers, and the resin may be an epoxy resin.

In view of the deficiencies of the prior art, the second object of the present invention is to provide an insulating tube which can be more conveniently mounted and connected and which solves the problem of difficulty in sealing.

In order to achieve the above object, the technical means adopted by the present invention are as follows: an insulating tube is applied to an insulating sleeve including an insulator, a head portion and a tail portion, the insulator including an intermediate shed portion and a connection thereto a lower flange at a lower end of the shed skirt, the head including an oil sump coupled to an upper end of the insulator, and a terminal connected to the oil sump, the tail portion being coupled to a lower end of the insulator, the tail portion including the insulating tube, the insulation The tube is made of FRP.

The insulating tube of the present invention is manufactured by using an FRP material to manufacture an insulating tube. When the insulating tube is installed, the insulating tube of FRP material can be conveniently connected with members of other materials such as metal flanges and metal cylinders. Compared with the porcelain insulating tube of the prior art, the insulating tube of the FRP material of the present invention can be mounted and connected by various means such as plastic binding, and the porcelain insulating tube is very difficult to connect and is not easy to seal. The insulating tube connecting surface of the FRP material can be conveniently processed, and the sealing groove can be conveniently arranged and the sealing ring can be added. Therefore, the insulating tube of the present invention can be conveniently sealed and connected with respect to the porcelain insulating tube. The insulating tube of the invention has convenient installation and connection, good sealing effect, reduced difficulty in installation and sealing, simple manufacture and cost saving.

In addition, the above-mentioned insulating tubes of the present invention are generally not used in the industry because of the technical prejudice that the glass reinforced plastics will dissolve into the oil of the equipment and pollute the oil. Through the verification of the structure of the present invention, it was found that the glass fiber reinforced plastic material can be used as the insulating tube, so the present invention has customer service technology bias. In addition, the present invention also provides other measures, such as the setting of the inner liner and the insulating varnish, completely eliminating the hidden dangers in the technical bias.

DRAWINGS

1 is a half cross-sectional view showing an insulating sleeve 1000 according to Embodiment 1 of the present invention;

Figure 2 is a partial cross-sectional view showing a portion of an insulating sleeve of a second embodiment of the present invention.

among them,

1000——insulating sleeve;

1001 - electrical conductor;

1002——capacitor core;

100, 200 - tail;

101, 201 - insulating tube;

202——metal cylinder;

103, 203 - lower terminal;

104——equal pressure ball;

110, 210 - insulator;

111, 211 - inner core tube;

112, 212 - umbrella skirt;

113 - upper flange;

114, 214 - lower flange;

120——head;

121——oil pillow;

122 - terminal block.

detailed description

Specific embodiments of the invention are disclosed herein as required. However, it should be understood that the embodiments disclosed herein are merely exemplary of the invention and may be embodied in various forms. Therefore, the specific details disclosed herein are not to be construed as limiting, but rather as the basis of the claims, and as a representative basis for teaching the skilled in the art to apply the present invention differently in any suitable manner in practice. This includes the use of various features disclosed herein in conjunction with features that may not be explicitly disclosed herein.

Embodiment 1:

As shown in FIG. 1, the insulating sleeve 1000 of the present embodiment includes an insulator 110, a head 120 connected to the upper end of the insulator, and a tail portion 100 connected to the lower end of the insulator 110.

The insulator 110 includes an inner core barrel 111, a shed portion 112 that covers the outer side of the inner core tube 111, and an upper flange 113 that is coupled to the upper end of the shed portion 112 and a lower flange 114 that is connected to the lower end. Inner core tube 111 It is a hollow tube made of FRP. The inner core barrel 111 may be wound by a glass fiber impregnated epoxy resin to be solidified. In addition, those skilled in the art can also manufacture the inner core tube 111 by molding or other processes, or by using other fibers, such as aramid fibers, with a resin according to actual conditions. The umbrella skirt portion 112 is integrally molded of silicone rubber by vacuum injection. The upper flange 113 and the lower flange 114 are metal flanges. The upper flange 113 and the lower flange 114 in this embodiment are made of aluminum alloy, and may be made of other metal materials such as iron. The insulator 110 of this embodiment is a composite insulator, and those skilled in the art can select porcelain insulators or other types of insulators according to actual needs and the like.

The head 120 includes a oil pillow 121 attached to the upper flange 113, and a terminal 122 connected to the oil pillow 121. The oil level of the oil in the insulating sleeve 1000 reaches the position of the oil pillow 121, and the oil level can be monitored by the oil pillow 121. The terminal block 122 is used to lead the lead wires of the device to be connected to other external devices. The terminal 122 of this embodiment is made of copper.

The tail portion 100 includes an insulating tube 101. The lower end of the insulating tube 101 is connected with a lower terminal 103, and the lower terminal 103 is provided with a pressure equalizing ball 104. The insulating tube 101 is made of FRP. The insulating tube 101 in this embodiment is a glass fiber impregnated epoxy resin wound molding. In addition to this, the insulating tube 101 can also be formed by other suitable molding methods such as die casting. In this embodiment, the lower terminal 103 is made of aluminum alloy, the pressure equalizing ball 104 is made of aluminum alloy, and the pressure equalizing ball 104 is fixed to the lower terminal 103 by internal bolts. The insulating tube 101 is sealingly attached to the lower flange 114 by means of a glue. The lower terminal 103 is attached to the lower end of the insulating tube 101 by means of a glue.

The insulating sleeve 1000 further includes an electrical conductor 1001 and a capacitor core 1002. The conductor 1001 is a columnar conductor, generally made of an aluminum alloy, and may be other metals such as copper. The electrical conductor 1001 may be a solid cylinder or a hollow tube. The upper end of the electrical conductor 1001 is connected to the terminal 122, and the lower end is connected to the lower terminal 103. On the outer side of the conductor 1001, a layered capacitor core 1002 is further disposed in the inner core tube 111 and the insulating tube 101. The lead of the outermost layer of the capacitor core 1002 is grounded. Further, the insulating sleeve 1000 is filled with oil (not shown) in the apparatus to which the insulating sleeve 1000 is applied. The oil level of the oil reaches the oil pillow 121, and both the capacitor core 1002 and the conductor 1001 are immersed in the oil. The insulating sleeve 1000 of the present embodiment can be used as an outlet bushing for a device such as a transformer or a reactor.

A lining (not shown) is also disposed in the insulating tube 101. The lining is a polyester lining for preventing corrosion of the insulating tube 101 of the FRP material, and at the same time avoiding contamination of the oil by the dissolved product of the FRP. . An insulating varnish (not shown) is also coated on the outside of the insulating tube 101, and the insulating varnish is Epoxy paint or polyurethane can also avoid corrosion of the insulating tube 101 of the FRP material and prevent the oil from being contaminated by the dissolved product of the FRP.

In the insulating sleeve 1000 of the present embodiment, the insulating tube 101 is made of a glass fiber reinforced plastic material. When the insulating tube 101 is mounted on the lower flange 114 and the lower terminal 103 is mounted on the insulating tube 101, it can be directly connected by glue. And the sealing effect is good. Compared with the porcelain insulating tube of the prior art, the insulating tube 101 made of glass fiber reinforced plastic of the invention has convenient connection and good sealing effect. The insulating tube 101 of the present embodiment can be provided with a sealing groove at the connection surface with the lower flange 114 and the lower terminal 103, and a sealing ring is disposed in the sealing groove, which is more advantageous for improving the sealing property of the connection. The insulating sleeve 1000 of the present embodiment is directly fixed by means of glue when the insulating tube 101 and the lower terminal 103 are mounted, instead of being fixed by spring and electric conductor in the prior art, so that the insulating sleeve is assembled. 1000 is convenient and saves costs.

Embodiment 2:

As shown in FIG. 2, the insulating sleeve of the present embodiment, in which only the structure of the lower portion is shown in FIG. 2, the upper portion and the capacitor core in the insulating sleeve are not shown, and the structure not shown in the embodiment and the present invention The corresponding structures of the first embodiment are the same.

The insulating sleeve of this embodiment includes an insulator 210, a head (not shown) connected to the upper end of the insulator 210, and a tail portion 200 connected to the lower end of the insulator 210.

The insulator 210 includes an inner core barrel 211, a shed portion 212 that covers the outer core tube 211, and an upper flange (not shown) attached to the upper end of the shed portion 212 and a lower flange 214 at the lower end. The inner core barrel 211 is a hollow tube made of glass fiber reinforced plastic. The inner core barrel 211 may be wound by a glass fiber impregnated epoxy resin to be solidified. In addition, those skilled in the art can also woven the inner core tube 211 with a resin by molding or other processes, or by using other fibers, such as aramid fibers, according to actual conditions. The umbrella skirt 212 is integrally molded of silicone rubber by vacuum injection. The upper flange and the lower flange 214 are metal flanges. The upper flange 213 and the lower flange 214 of the embodiment are made of iron, and may be made of other metal materials such as aluminum alloy. The insulator 210 of this embodiment is a composite insulator, and those skilled in the art can select porcelain insulators or other types of insulators according to actual needs and the like.

The tail portion 200 includes an insulating tube 201 and a metal cylinder 202 connected to the upper end of the insulating tube 201, and a lower terminal 203 is connected to the lower end of the insulating tube 201. The insulating sleeve of this embodiment is used for a low voltage class of equipment, so that a pressure equalizing ball is not placed outside the lower terminal 203. Of course, the insulating sleeve of this embodiment is also suitable for equipment of high voltage level, and is used for adding a pressure equalizing ball according to actual conditions when used for a high voltage level. And other components. The insulating tube 201 is made of FRP. Insulating tube 201 in this embodiment is formed by glass fiber impregnated epoxy resin winding. In addition to this, the insulating tube 201 can also be formed by other suitable molding methods such as die casting. In this embodiment, the lower terminal 203 is made of an aluminum alloy. The upper end of the metal cylinder 202 is fixedly coupled to the lower flange 214 by bolts. A sealing ring (not shown) is provided at a portion where the metal cylinder 202 is connected to the lower flange 214 to seal the metal cylinder 202 and the lower flange 214. The outer portion of the metal cylinder 202 is used to sleeve the transformer coil, and the metal cylinder 202 is grounded through the lower flange 214. The lower terminal 203 is attached to the lower end of the insulating tube 201 by means of a glue. The metal tube 202 and the insulating tube 201 can be sealedly connected by means of glue or interference fit.

When the metal cylinder 202 and the insulating tube 201 are connected by means of glue, only the portion where the metal cylinder 202 and the insulating tube 201 are combined is coated with a resin glue, and the two are cured after the resin resin is cured. Further, a sealing ring may be added to a portion where the metal cylinder 202 and the insulating tube 201 are combined to improve the sealing effect. Compared with the prior art, the fixing is performed by means of spring tightening, and fixing the metal cylinder 202 and the insulating tube 201 by means of glue mounting greatly simplifies the installation process, reduces the installation difficulty, and has a good sealing effect. In addition, the connection by means of glue mounting increases the bonding strength of the insulating tube 201 and the metal cylinder 202, improves the mechanical properties of the joint, and can effectively prevent the joint from being damaged or misplaced at the joint when the joint is affected by the external force, so that the seal appears. problem.

When the metal cylinder 202 and the insulating tube 201 are connected by an interference fit, the inner diameter of the joint portion of the metal cylinder 202 and the insulating tube 201 and the outer diameter of the portion where the insulating tube 201 is connected to the metal cylinder 202 are tightly fitted. First, the portion where the metal tube 202 is connected to the insulating tube 201 is heated, and the heated portion is thermally expanded. The metal tube 202 is sleeved on the insulating tube 201 and cooled, and the diameter of the connecting portion of the metal tube 202 and the insulating tube 201 is set. It is cooled down and tightly fixed to the insulating tube 201. The method of connecting the fixed insulating tube 201 and the metal cylinder 202 by means of interference fit is simple and the connection is tight, and the sealing effect can be achieved very well. Compared with the prior art, it is not required to be fixed by spring tightening, thereby saving Installation time and cost.

The insulating sleeve of the present embodiment has the advantages of the insulating sleeve 1000 of the first embodiment of the present invention. In addition, the insulating sleeve of the present embodiment can be jacketed in the metal cylinder 202 by providing the metal cylinder 202 at the tail portion 200. A transformer coil is provided for detecting parameters such as current or voltage in the insulating sleeve. The metal cylinder 202 and the insulating tube 201 are connected by means of glue or interference fit, and are prevented from being fixed by spring tightening, which simplifies the installation step, enhances the joint strength, and improves the sealing performance. The insulating sleeve of this embodiment can be used as a transformer or circuit breaker of a low voltage level. For the outlet bushing, the insulating sleeve of the embodiment can be used as a high voltage class device by adding a pressure equalizing ball or the like.

In the embodiment of the invention, the oil pillow and the upper flange are separately arranged. It is worth noting that the oil pillow and the upper flange can also be integrated, and the upper end of the umbrella skirt is directly connected with the oil pillow.

Although only the composite insulator is described in the embodiment of the present invention, it should be noted that those skilled in the art can naturally think that the insulator of the present invention can also be a porcelain insulator or other material insulator according to the description of the embodiments of the present invention.

The technical contents and technical features of the present invention have been disclosed above, however, it will be understood that those skilled in the art can make various changes and modifications to the above-described structures and materials, including separately disclosed or claimed herein. Combinations of technical features obviously include other combinations of these features. These variations and/or combinations are all within the technical scope of the present invention and fall within the scope of the claims of the present invention.

Claims

An insulating sleeve comprising:

An insulator comprising an intermediate shed skirt and a lower flange attached to a lower end of the shed skirt;

a head comprising an oil pillow connected to an upper end of the insulator, and a terminal connected to the oil pillow;

a tail portion connected to a lower end of the insulator, the tail portion including an insulating tube;

The utility model is characterized in that: the insulating tube is made of glass fiber reinforced plastic.
The insulating bushing according to claim 1, wherein said insulating tube is sealingly connected to a lower end of said insulator.
The bushing according to claim 1, wherein said tail portion further comprises a metal cylinder, said metal cylinder upper portion being coupled to said lower flange and said lower portion being coupled to said insulating tube.
The insulating sleeve according to claim 3, wherein said insulating tube is adhesively coupled to said metal can.
The bushing according to claim 3, wherein said metal cylinder is coupled to said insulating tube by an interference fit.
The insulating sleeve according to claim 1, wherein an inner liner is disposed in said insulating tube.
The insulating sleeve according to claim 1, wherein said insulating tube is coated with an insulating varnish.
The insulating sleeve according to claim 1, wherein said insulating tube is formed by winding a fiber impregnated resin.
An insulating tube is applied to an insulating sleeve, the insulating sleeve including an insulator, a head portion and a tail portion, the insulator including an intermediate shed portion and a lower flange connected to a lower end of the shed portion, the head portion An oil pillow connected to an upper end of the insulator, and a terminal connected to the oil pillow, the tail portion being connected to a lower end of the insulator, the tail portion including the insulating tube, wherein the insulating tube Made of FRP.