CN203481020U - Rubber impregnated paper capacitive transformer bushing - Google Patents

Abstract

The utility model discloses a rubber-impregnated paper capacitive transformer bushing, which comprises an outer conduit, and the outer circumference of the outer conduit is coaxially provided with a capacitor core and an insulating sleeve; The tail connector; the current-carrying terminal is fixed by the pull rod structure; the current-carrying is carried out in the form of a spring and a strap contact; the insulating sleeve includes an epoxy glass fiber tube and an organic composite silicone rubber sleeve wrapped around the epoxy glass fiber tube; the capacitor core Epoxy resin glue impregnated paper insulation structure; SF ₆ gas is filled between the capacitor core and the insulating sleeve. The utility model fills the gap in the development of domestic 550kV glue-impregnated paper capacitive transformer bushings; reduces the country's dependence on imported dry-type bushing products; solves the sealing and current-carrying problems of UHV epoxy-impregnated bushings, and meets The requirements for the localization of rubber-impregnated paper capacitive transformer bushings are met.

Description

A rubber-impregnated paper capacitive transformer sleeve

technical field

The utility model relates to the field of transformers and fully enclosed combined electrical appliances, in particular to a rubber-impregnated paper capacitive transformer sleeve.

Background technique

The rubber-impregnated paper capacitive transformer bushing made of epoxy resin impregnated insulating paper technology has the advantages of free maintenance, no pollution, small size, light weight, and convenient use. It is welcomed by more and more users, making it a bushing The highlights of the tube market are favored by users. With the development of the power grid, the use of rubber-impregnated paper dry-type capacitive transformer bushings can achieve low noise, no pollution, fire prevention, explosion protection, and small combination. According to the development trend of oil-free power system, dry bushing has a good market prospect.

However, the sealing and current-carrying problems of UHV epoxy-impregnated bushings have always plagued the development of rubber-impregnated paper capacitive transformer bushings. With the rapid application of dry-type bushings in China in recent years, the price of imported dry-type bushings Expensive, and the development of ultra-high voltage dry-type transformer bushings has become an urgent responsibility for domestic dry-type bushing manufacturers. The country is now carrying out UHV power grid construction, but the research and development of 550kV rubber-impregnated paper capacitive transformer bushings has been blank in China.

Utility model content

The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art and provide a rubber-impregnated paper capacitive transformer sleeve, which can effectively solve the sealing and current-carrying problems of the UHV transformer sleeve.

In order to achieve the above purpose, the rubber-impregnated paper capacitive transformer sleeve described in the utility model is provided with an inner conduit, an outer conduit, a capacitor core and an insulating sleeve sequentially from the inside to the outside, and the two ends of the inner conduit are respectively equipped with head connectors Head and tail connectors;

The head connector includes a cover plate that is sealed and connected to the end face of one end of the insulating sleeve, and a terminal fixed on the cover plate. The cover plate is sealed and connected to the end face of one end of the capacitor core. One end passes through the through hole, the terminal is in contact with the inner conduit, the other end of the insulating sleeve is connected with a middle structure used to seal the cavity between the insulating sleeve and the capacitor core, the middle structure is clamped on the capacitor core, and the insulating sleeve The cavity between the capacitor core and the capacitor core is filled with insulating gas, and the middle structure is provided with an upper flange for connecting the transformer;

The tail connector includes a base connected to the other end of the capacitor core, and a current-carrying terminal fixed on the base, the current-carrying terminal is in contact with the other end of the inner conduit.

The insulating gas is SF ₆ gas.

The capacitor core is made of paper impregnated with epoxy resin.

The capacitor core is provided with a protrusion, the middle structure is provided with a connecting sleeve, and an upper flange and a lower flange arranged at both ends of the connecting sleeve, and the upper flange and the lower flange are respectively clamped on the raised sides;

The insulating sleeve and the upper flange, the upper flange and the connecting sleeve, and the connecting sleeve and the lower flange are all connected by means of end face sealing;

The lower end of the lower flange is fixed with a first pressure plate, and the capacitor core is sealed and connected with the first pressure plate and the connecting sleeve;

The connecting sleeve is provided with measuring devices for measuring dielectric loss, partial discharge and capacitance of the bushing.

The inside of the inner conduit is provided with a spring tensioning device, a pull rod and a connecting sleeve, the spring tensioning device is connected to the inner wall of the inner conduit, one end of the pull rod is connected to the spring tensioning device through the connecting sleeve, and the other end is connected to the current-carrying terminal connected.

The head connector also includes a positioning seat for axially positioning the inner conduit, the positioning seat is sleeved on the inner conduit, the inner conduit and the positioning seat are axially sealed, and the positioning seat is fixedly connected with the cover plate.

Axial sealing between the cover plate and the inner conduit;

The end face between the terminal and the cover plate is sealed;

The end face between the insulating sleeve and the cover plate is sealed.

The inner conduit is in contact with the terminal through a current-carrying spring;

The inner conduit is in contact with the current carrying terminals through the strap contacts.

The tail connector also includes a second pressure plate, a pressure equalizing ball and a positioning cone socketed on the pull rod, the pressure equalizing ball is clamped on the base, and the outer conduit and the inner conduit are connected through the second pressure plate and the base;

The sealed connection between the capacitor core and the base;

Sealed connection between the base and the second pressure plate;

There is a sealed connection between the base and the current-carrying terminal.

The utility model has the following beneficial effects:

The rubber-impregnated paper capacitive transformer tube sleeve described in the utility model is provided with an inner conduit and an outer conduit, thereby effectively reducing the influence of the heating of the conductive tube of the sleeve on the performance of the insulating core; in addition, between the capacitor core and the connecting sleeve It is designed with a double sealing structure, which can effectively prevent the filling gas from leaking into the transformer. In addition, the two ends of the inner conduit are respectively connected to the terminal and the current-carrying terminal, which effectively solves the problem of the inner conduit carrying current. The new type fills the gap in the development of domestic 550kV rubber-impregnated paper capacitive transformer bushings; reduces the country's dependence on imported dry-type bushing products; solves the sealing and current-carrying problems of UHV epoxy-impregnated bushings, and meets the requirements of glue Requirements for localization of paper-impregnated capacitive transformer bushings.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural schematic diagram of the head connector 100 in the utility model;

Fig. 3 is the structure schematic diagram of middle structure 101 in the utility model;

FIG. 4 is a schematic structural diagram of the tail connector 102 in the present invention.

Among them, 1 is a pressure equalizing ring, 2 is a terminal, 3 is a current-carrying spring, 4 is a positioning seat, 5, a spring tensioning device, 6 is an inner conduit, 7 is a cover plate, 8 is an insulating sleeve, and 9 is a connecting sleeve , 10 is the tie rod, 11 is the upper flange, 12 is the measuring device, 13 is the connecting sleeve, 14 is the first pressure plate, 15 is the lower flange, 16 is the positioning cone, 17 is the outer conduit, 18 is the watch strap contact , 19 is the second pressure plate, 20 is the pressure ring, 21 is the positioning sleeve, 22 is the pressure equalizing ball, 23 is the current carrying terminal, 24 is the base, 25 is the capacitor core, 100 is the head connector, 101 is the middle structure , 102 is the tail connector.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail:

Referring to Fig. 1 and Fig. 2, the rubber-impregnated paper capacitive transformer tube sleeve described in the utility model is provided with an inner conduit 6, an outer conduit 17, a capacitor core 25 and an insulating sleeve 8 sequentially from the inside to the outside. A head connector 100 and a tail connector 102 are installed at the ends respectively, and the inner conduit 6, the outer conduit 17 and the capacitor core 25 are sealed and socketed, and the cavity between the capacitor core 25 and the insulating sleeve 8 is filled with SF ₆ For gas, the capacitor core 25 adopts an insulating structure impregnated with epoxy resin glue, and the insulating sleeve 8 is an organic composite silicon rubber sleeve coated with an epoxy glass fiber tube.

The head connector 100 includes a pressure equalizing ring 1, a terminal post 2, a current-carrying spring 3, a positioning seat 4, a spring tensioning device 5, a pull rod 10, a connecting sleeve 9 and a cover plate 7, and one end of the insulating sleeve 8 is provided with The connection flange, the cover plate 7 is fixedly connected with the connection flange at one end of the insulating sleeve 8, a through hole is opened on the cover plate 7, and the inner conduit 6 passes through the through hole; the positioning seat 4 is sleeved on the outer wall of the inner conduit 6 , and fixed on the cover plate 7 by fixing screws, the positioning seat 4 positions the inner conduit 6 by pressing the sealing rubber; Contact with the inner conduit 6 to realize the current-carrying function; the spring tensioning device 5 is fixed inside the inner conduit 6, and the current-carrying terminal 23 is tightened on the second pressure plate 19 through the pull rod 10 and the connecting sleeve 9, so that the inner conduit The current on 6 is transmitted to the terminal 2 through the current-carrying spring 3, and the equalizing ring 1 is socketed with the insulating sleeve 8.

The cover plate 7 is respectively connected to the positioning seat 4 and the inner conduit 6 by axial sealing; between the terminal post 2 and the cover plate 7, and between the cover plate 7 and the insulating sleeve 8 are connected by end face sealing; all the sealing Limiting measures are taken to avoid excessive compression of the sealing ring and to ensure reliable sealing performance. The cavity between the capacitor core 25 and the insulating sleeve 8 is filled with 0.35MPa SF ₆ gas. The sealing technology of SF ₆ gas requires high requirements. The roughness of all sealing surfaces has been increased from 6.3 to 3.2.

Referring to Fig. 4, the casing tail end connector 102 comprises a pull rod 10, a positioning cone 16, a strap contact 18, a base 24, a second pressure plate 19, a current-carrying terminal 23 and a pressure equalizing ball 22; Two sealing gaskets are arranged between the base 24 of the lower part, a sealing gasket is arranged between the base 24 and the second pressing plate 19 arranged at its lower part, and a sealing gasket is arranged between the second pressing plate 19 and the current-carrying terminal 23; The pressure ball 22 is mounted on the base 24 through the clamping ring 20 and the positioning sleeve 21 in the form of clamping. The current-carrying terminal 23 is pulled upward through the pull rod 10 and the positioning cone 16, and is connected to the inner conduit 6 through the strap contact 18 to carry the current. , the inner conduit 6 and the outer conduit 17 are connected and fixed through the second pressure plate 19 and the base 24 .

Referring to Fig. 3, the capacitor core 25 is provided with protrusions, the middle structure 101 is provided with a connecting sleeve 13, and an upper flange 11 and a lower flange 15 arranged at both ends of the connecting sleeve 13, the upper flange 11 and the lower flange 15 are clamped on both sides of the protrusion respectively; between the insulating sleeve 8 and the upper flange 11, between the upper flange 11 and the connecting sleeve 13, and between the connecting sleeve 13 and the lower flange 15 are connected by means of end face sealing; the lower end of the lower flange 15 is fixed with a first pressure plate 14, and the capacitor core 25 is sealed and connected with the first pressure plate 14 and the connecting sleeve 13; the connecting sleeve 13 A measuring device 12 for measuring the dielectric loss, partial discharge and capacitance of the capacitor core 25 is provided on it. It can ensure the safe and reliable operation of the bushing, and at the same time ensure the reliable electrical performance of the bushing. The upper flange 11 is provided with a flange hole for connecting a transformer.

The technical performance indicators of the glue-impregnated paper capacitive transformer bushing described in the utility model are as follows:

Claims (10)

1. A glue-impregnated paper capacitive transformer sleeve is characterized in that, from the inside to the outside, an inner conduit (6), an outer conduit (17), a capacitor core (25) and an insulating sleeve (8) are arranged successively, and the inner conduit (6) and the outer conduit (17) are arranged successively. Both ends of the conduit (6) are respectively equipped with a head connector (100) and a tail connector (102); The head connector (100) includes a cover plate (7) sealingly connected to the end face of one end of the insulating sleeve (8), and a terminal post (2) fixed on the cover plate (7), the cover plate (7) It is sealed and connected with the end face of one end of the capacitor core (25), the cover plate (7) is provided with a through hole for the inner conduit (6) to pass through, the terminal (2) is in contact with the inner conduit (6), and the insulating sleeve The other end of (8) is connected with the middle structure (101) that is used to seal the cavity between the insulating sleeve (8) and the capacitor core (25), the middle structure (101) is socketed on the capacitor core (25), insulated The cavity between the sleeve (8) and the capacitor core (25) is filled with insulating gas, and the middle structure (101) is provided with an upper flange (11) for connecting a transformer; The tail connector (102) includes a base (24) connected to the other end of the capacitor core (25), and a current-carrying terminal (23) fixed on the base (24), the current-carrying terminal (23) is connected to the inner The other end of the conduit (6) is in contact. 2. The rubber-impregnated paper capacitive transformer bushing according to claim 1, wherein the insulating gas is SF ₆ gas. 3. The glue-impregnated paper capacitive transformer sleeve according to claim 1, characterized in that, the capacitor core (25) is made of epoxy resin glue-impregnated paper. 4. The rubber-impregnated paper capacitive transformer tube sleeve according to claim 1, characterized in that, the capacitor core (25) is provided with a protrusion, and the middle structure (101) is provided with a connecting sleeve (13 ), and the upper flange (11) and the lower flange (15) arranged at both ends of the connecting sleeve (13), the upper flange (11) and the lower flange (15) are respectively clamped on the two raised side; Between the insulating sleeve (8) and the upper flange (11), between the upper flange (11) and the connecting sleeve (13), and between the connecting sleeve (13) and the lower flange (15) Connected by means of end face sealing; The lower end of the lower flange (15) is fixed with a first pressure plate (14), and the capacitor core (25) is in sealing connection with the first pressure plate (14) and the connecting sleeve (13). 5. The glue-impregnated paper capacitive transformer tube sleeve according to claim 4, characterized in that, the connecting sleeve (13) is provided with a device for measuring dielectric loss, partial discharge and capacitance of the capacitor core (25). Measuring device (12). 6. The rubber-impregnated paper capacitive transformer tube sleeve according to claim 1, characterized in that, the inside of the inner conduit (6) is provided with a spring tensioning device (5), a pull rod (10) and a connecting sleeve (9 ), the spring tensioning device (5) is connected to the inner wall of the inner conduit (6), one end of the pull rod (10) is connected to the spring tensioning device (5) through the connecting sleeve (9), and the other end is connected to the current-carrying terminal ( 23) Connected. 7. The rubber-impregnated paper capacitive transformer tube sleeve according to claim 1, characterized in that, the head connector (100) also includes a positioning seat (4) for axially positioning the inner conduit (6), The positioning seat (4) is sleeved on the inner conduit (6), the axial seal between the inner conduit (6) and the positioning seat (4), and the positioning seat (4) is fixedly connected with the cover plate (7). 8. The glue-impregnated paper capacitive transformer bushing according to claim 7, characterized in that, Axial sealing between the cover plate (7) and the inner conduit (6); The end surface between the terminal (2) and the cover plate (7) is sealed; The end face between the insulating sleeve (8) and the cover plate (7) is sealed. 9. The glue-impregnated paper capacitive transformer sleeve according to claim 1, characterized in that, The inner conduit (6) is in contact with the terminal post (2) through a current-carrying spring (3); The inner conduit (6) is in contact with the current-carrying terminal (23) through the strap contact (18). 10. The glue-impregnated paper capacitive transformer bushing according to claim 1, characterized in that, The tail connector (102) also includes a second pressure plate (19), a pressure equalizing ball (22) and a positioning cone (16) sleeved on the pull rod (10), and the pressure equalizing ball (22) is clamped on the base ( 24), the outer conduit (17) is connected to the inner conduit (6) through the second pressure plate (19) and the base (24); Sealed connection between the capacitor core (25) and the base (24); Sealed connection between the base (24) and the second pressure plate (19); The base (24) is sealed and connected to the current-carrying terminal (23).

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