CN218482096U - Sleeve and voltage divider integrated extra-high voltage direct current valve side outgoing line sleeve - Google Patents

Abstract

The utility model discloses a bushing and voltage divider integrated extra-high voltage direct current valve side outlet bushing, wherein a capacitor core is arranged on the body of a current-carrying tube, and a plurality of layers of voltage-dividing capacitor screens are sequentially and alternately rolled on the capacitor core from inside to outside; a plurality of insulating protective layers are also rolled outside the voltage-dividing capacitive screen, and end screen leads and voltage monitoring leads which penetrate through the insulating protective layers are respectively arranged on the two outermost voltage-dividing capacitive screens; through increasing partial pressure electric capacity screen on the electric capacity core, realize the voltage divider effect, form sleeve pipe, voltage divider integral type structure, the rethread is realized keeping watch on alternating voltage to the monitoring of partial pressure electric capacity screen, has thoroughly avoided the fault defect problem of external voltage divider, promotes valve side sleeve pipe operational reliability.

Description

Sleeve and voltage divider integrated extra-high voltage direct current valve side outgoing line sleeve

Technical Field

The utility model relates to a special high voltage direct current valve side outlet sleeve pipe of sleeve pipe, voltage divider integral type belongs to sleeve pipe technical field.

Background

At present, with the large-scale construction of ultrahigh voltage alternating current and direct current transmission projects in China, high-voltage, long-distance and large-capacity transmission requirements put higher requirements on the reliability of the long-term operation performance of alternating current and direct current equipment. The extra-high voltage direct current valve side outlet sleeve is used as an important high-voltage electrical component for connecting a converter station valve hall with alternating current field and direct current field equipment, and the performance stability of the extra-high voltage direct current valve side outlet sleeve is directly related to the safe and stable operation of an alternating current-direct current hybrid power grid. The extra-high voltage direct current valve side outlet sleeve is used as one of isolation devices of an alternating current-direct current system, and in order to monitor the stability of the long-term operation performance of the system, an alternating current voltage monitoring mode is mainly adopted at present, and an external voltage divider is connected through the end screen of the direct current valve side outlet sleeve to collect voltage signals. An external voltage divider of a direct current valve side outgoing line sleeve is an indispensable part of a converter transformer, and generally the external voltage divider is bridged between a converter transformer valve side sleeve end screen and the ground, and primary voltage on the converter transformer valve side is converted into secondary voltage output required by a system according to a capacitance voltage division principle. However, the external voltage divider connects the end screen of the valve side sleeve with the voltage divider capacitor, and when the voltage divider fails or has defects, the end screen of the valve side sleeve loses grounding, the end screen of the valve side sleeve suspends, and the end screen of the valve side sleeve generates end screen suspension discharge to cause serious faults such as capacitor core discharge breakdown and the like.

SUMMERY OF THE UTILITY MODEL

For thoroughly solving external voltage divider fault defect, improve extra-high voltage direct current valve side outlet sleeve pipe operating stability, the utility model provides a sleeve pipe, voltage divider integral type extra-high voltage direct current valve side outlet sleeve pipe increases the partial pressure electric capacity screen on extra-high voltage direct current valve side outlet sleeve pipe's electric capacity core, realizes the voltage divider effect through the partial pressure electric capacity screen that increases, forms sleeve pipe, voltage divider integral type structure, realizes keeping watch on alternating voltage through the monitoring to the partial pressure electric capacity screen.

The utility model discloses the technical scheme who adopts does:

the utility model provides a sleeve pipe, special high voltage direct current valve side outlet wire sleeve of voltage divider integral type, includes:

the current-carrying tube is characterized in that a capacitor core is arranged on a tube body of the current-carrying tube, a plurality of layers of voltage-dividing capacitor screens are sequentially and alternately rolled on the capacitor core from inside to outside, the number of the layers of the voltage-dividing capacitor screens is n, n is not less than 3 and not more than 6, the voltage-dividing capacitor screens on odd layers are sequentially connected in an equipotential manner from inside to outside, and the voltage-dividing capacitor screens on even layers are sequentially connected in an equipotential manner; a plurality of insulating protective layers are also rolled outside the voltage-dividing capacitive screen, and end screen leads and voltage monitoring leads which penetrate through the insulating protective layers are respectively arranged on the two outermost voltage-dividing capacitive screens; when n =3, the voltage-dividing capacitive screen of the even layer is directly connected with the end screen lead or the voltage monitoring lead;

the capacitor core penetrates through the wall-penetrating flange from top to bottom and is fixedly connected with the wall-penetrating flange, and a tube body of the wall-penetrating flange is provided with a tail screen terminal connected with a tail screen lead and a voltage monitoring terminal connected with a voltage monitoring lead;

the hollow composite insulator is sleeved at the upper ends of the current-carrying tube and the capacitor core, the lower end of the hollow composite insulator is connected with the through-wall flange, the upper end of the hollow composite insulator is provided with a head connecting seat, and the top end of the current-carrying tube penetrates through the head connecting seat and extends to the upper part of the hollow composite insulator;

the wire holder is sleeved at the top end of the current-carrying tube above the hollow composite insulator and is fixedly connected with the head connecting seat;

the pressure equalizing ball is covered on the outer side of the top end of the hollow composite insulator and is fixedly connected with the head connecting seat;

the lower sealing sleeve is inserted into the tail ends of the current-carrying tube and the capacitor core from top to bottom and is abutted against the tail ends of the current-carrying tube and the capacitor core;

the tail connecting seat is inserted into the lower sealing sleeve from top to bottom and extends into the tail end of the current-carrying pipe;

and the oil middle wiring board is arranged at the bottom of the tail connecting seat.

As the utility model discloses a preferred, form the accommodation space between hollow composite insulator and the electric capacity core the accommodation space intussuseption is filled with insulating filling medium.

As an optimization of the utility model the bottom of head connecting seat is provided with the shielding ball, the shielding ball inserts in the hollow composite insulator and the current-carrying pipe alternates the shielding ball.

As a preferred the utility model discloses a hollow composite insulator's both ends all are provided with fixed cover, hollow composite insulator through fixed cover with corresponding wear wall flange, head connecting seat bolted connection.

As the utility model discloses a preferably, still be provided with the seal cover at the top of electric capacity core, go up the seal cover and establish on the current-carrying tube, go up the seal cover insert electric capacity core and current-carrying tube between the clearance and with the tip butt of electric capacity core, still overlap on the current-carrying tube that is located the seal cover top and be equipped with the retainer plate, retainer plate and last seal cover fixed connection.

As the utility model discloses a preferably, the electric capacity core is the definite gradient and extends to both ends, and the lower extreme flange mouth of wearing the wall flange forms the support to the electric capacity core with the ladder groove notch butt of electric capacity core below, and the upper end flange mouth of wearing the wall flange overlaps on the electric capacity core with the ladder groove notch department heavy-calibre section outer wall butt of electric capacity core top and be equipped with the solid fixed ring with the ladder groove notch butt of electric capacity core top, gu fixed ring and the upper end flange mouth fixed connection who wears the wall flange.

As a preferred embodiment of the present invention, the capacitor core includes a coiled pipe, a plurality of groups of insulating corrugated paper layers, a plurality of groups of short capacitor screen layers and a plurality of groups of long capacitor screen layers, the coiled pipe is sleeved outside the current-carrying pipe, the plurality of groups of insulating corrugated paper layers, the plurality of groups of short capacitor screen layers and the plurality of groups of long capacitor screen layers are sequentially and alternately coiled on the outer wall of the coiled pipe from inside to outside and are coiled outside the outermost long capacitor screen layer with one insulating corrugated paper layer, each long capacitor screen layer includes one long capacitor screen, each short capacitor screen layer includes two short capacitor screens coiled in a staggered manner, and one insulating corrugated paper layer is coiled between two adjacent short capacitor screen layers, between two adjacent long capacitor screen layers and between the adjacent short capacitor screen layer and the long capacitor screen layer;

through holes are respectively formed in the long capacitive screen and the short capacitive screen, and after the long capacitive screen and the short capacitive screen are rolled, the through holes in the long capacitive screen and the short capacitive screen are in a spiral shape which outwards diffuses by taking the current-carrying tube as a center;

the number of layers of the insulating corrugated paper layer of each layer set is at least 1, the number of layers of the short capacitive screen of each layer set is 1-3, and the number of layers of the long capacitive screen of each layer set is 1-8.

A manufacturing method of a bushing and voltage divider integrated extra-high voltage direct current valve side outlet wire sleeve comprises the following steps:

the method comprises the following steps: pretreatment: cutting and drying the insulating crepe paper according to the size requirement; punching the long capacitive screen, the short capacitive screen and the voltage-dividing capacitive screen, and controlling the size and the position of the holes by adopting a full-automatic electric Rong Bing punching machine;

step two: and (3) winding the capacitor core: wiping the coiled pipe and then fixing the coiled pipe on a coiling machine, then sequentially coiling the insulating crepe paper, the long capacitance screen and the short capacitance screen on the coiled pipe according to a capacitance core structure, and realizing the staggering of hole positions of the upper screen and the lower screen by controlling the step difference of each screen, the initial angle of coiling the capacitance screen and the punching position on the capacitance screen;

step three: coiling a voltage-dividing capacitive screen: according to the process requirements, a plurality of layers of voltage-dividing capacitor screens are sequentially rolled on a capacitor core in a staggered mode, then the voltage-dividing capacitor screens on odd layers are sequentially connected in an equipotential mode from inside to outside, and the voltage-dividing capacitor screens on even layers are sequentially connected in an equipotential mode;

before the outermost partial pressure capacitive screen is rolled, a fabrication hole is cut at the installation position corresponding to the end screen lead or the voltage monitoring lead, so that the end screen lead or the voltage monitoring lead on the subsequent inner partial pressure capacitive screen can conveniently penetrate out;

step four: rolling an insulating protective layer: winding a plurality of insulating protective layers outside the voltage-dividing capacitive screens, forming process holes in the insulating protective layers to enable the process holes to correspond to positions of end screen leads or voltage monitoring leads arranged on the two outer voltage-dividing capacitive screens, inserting the end screen leads or the voltage monitoring leads through the corresponding process holes and respectively correspondingly welding the end screen leads or the voltage monitoring leads on the two outer voltage-dividing capacitive screens;

step five: and (3) vacuum drying: unloading the rolled core body from the rolling machine, and transferring the core body into a vacuum drying tank for vacuum drying;

step six: vacuum pouring: after the core body is dried, carrying out vacuum epoxy casting and curing molding on the core body;

step seven: the core machine is added with: transferring the cured and molded core body into a machining workshop for machining the outside of the core body;

step eight: assembling: testing the machined core body, and assembling all components of the sleeve according to the product structure after the core body is qualified;

step nine: and (3) post-treatment: and (4) performing finished product test on the assembled sleeve, then sequentially performing inspection-packaging-re-inspection treatment, and warehousing for delivery after the inspection is qualified.

As one optimization of the utility model, the pressure of the upper compression roller of the coiling machine is 10kg, the coiling tension is 30kg, the tension of the uncoiling roller is 5kg, and the heating temperature of the hot roller is 90 +/-5 ℃; the rolling speed is as follows: 0.5-1m/min.

As a preferred embodiment of the present invention, the method of equipotential connection of the partial pressure capacitive screen in step three is:

when the voltage-dividing capacitive screens are sequentially rolled in a staggered mode, equipotential aluminum foils or copper sheets are rolled at the upper end portions of the voltage-dividing capacitive screens of the odd layers positioned on the inner side along with the insulating crepe paper, and the other ends of the equipotential aluminum foils or copper sheets are connected with the voltage-dividing capacitive screens of the odd layers adjacent to the outer layer; rolling equipotential aluminum foils or copper sheets at the lower end parts of the even-numbered partial pressure capacitance screens positioned at the inner side along with the insulating crepe paper, wherein the other ends of the equipotential aluminum foils or copper sheets are connected with the even-numbered partial pressure capacitance screens adjacent to the outer layer; or

After the partial pressure capacitance screens are rolled, holes are punched in the upper ends of the partial pressure capacitance screens on the odd layers, holes are punched in the lower ends of the partial pressure capacitance screens on the even layers, and copper wires are welded between the two corresponding partial pressure capacitance screens on the odd layers and the corresponding partial pressure capacitance screens on the even layers to achieve equipotential connection between the partial pressure capacitance screens.

The beneficial effects of the utility model reside in that:

1. the voltage division voltage screen is arranged on the capacitor core of the sleeve to form an integrated structure of the sleeve and the voltage divider, so that the problem of fault defects of the external voltage divider is thoroughly solved, and the operation reliability of the sleeve on the valve side is improved;

2. the voltage division voltage screens are connected in an equipotential manner, and voltage division inside the sleeve is monitored through the voltage division voltage screens, so that external interference is avoided, and the voltage monitoring reliability is improved;

3. the voltage screen adopts a multilayer screen cross equipotential connection mode, the number of layers of the voltage screen, the thickness of the voltage screen layer and the length of the voltage screen can be designed according to the required voltage division ratio, and the applicability is improved;

4. a voltage monitoring lead or an end screen lead of the partial voltage screen is led out from the partial voltage screen, an end screen terminal and a voltage monitoring terminal are arranged on the wall-penetrating flange, and other online monitoring equipment can be installed, so that real-time monitoring of dielectric loss, capacitance and partial discharge of the sleeve is realized.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the capacitor core;

FIG. 3 is a schematic structural view of the junction between the upper seal ring and the capacitor core;

FIG. 4 is a cross-sectional view of a capacitor core;

FIG. 5 is a top cross-sectional view of a capacitor core;

FIG. 6 is a schematic layout diagram of two long capacitive screens and one short capacitive screen at the top and bottom;

FIG. 7 is an equivalent circuit diagram corresponding to two long capacitive screens and one short capacitive screen above and below the two long capacitive screens;

FIG. 8 is a schematic layout diagram of two long capacitive screens and two short capacitive screens at the top and bottom;

FIG. 9 is an equivalent circuit diagram corresponding to two long capacitive screens and two short capacitive screens at the top and bottom;

FIG. 10 is a schematic diagram of the arrangement of the voltage dividing screen when the outermost voltage dividing capacitive screen is connected to the tail screen lead;

FIG. 11 is an equivalent circuit diagram of a voltage-dividing shield corresponding to the outermost voltage-dividing capacitive shield connected to the tail shield lead;

FIG. 12 is a simplified equivalent circuit diagram of the corresponding voltage dividing screen when the outermost voltage dividing capacitive screen is connected to the tail screen lead;

FIG. 13 is a schematic diagram of arrangement of corresponding voltage-dividing screens when an outermost voltage-dividing capacitive screen is connected to a voltage-monitoring lead;

FIG. 14 is an equivalent circuit diagram of the voltage dividing screen when the outermost voltage dividing capacitive screen is connected to the voltage monitoring lead;

FIG. 15 is a simplified equivalent circuit diagram of the voltage dividing screen when the outermost voltage dividing capacitive screen is connected to the voltage monitoring lead;

FIG. 16 is a schematic diagram of capacitive voltage division;

the main reference numerals in the figures have the following meanings:

1. the capacitor comprises a current-carrying tube, 2, a capacitor core, 3, a voltage-dividing capacitor screen, 4, an insulating protective layer, 5, an end screen lead, 6, a voltage monitoring lead, 7, a wall-penetrating flange, 8, an end screen terminal, 9, a voltage monitoring terminal, 10, a hollow composite insulator, 11, a head connecting seat, 12, an insulating filling medium, 13, a fixing sleeve, 14, a wire holder, 15, a voltage-equalizing ball, 16, a shielding ball, 17, a lower sealing sleeve, 18, a tail connecting seat, 19, an oil middle wiring board, 20, an upper sealing sleeve, 21, a fixing ring, 22, a fixing ring, 23, a coiled tube, 24, an insulating corrugated paper layer, 25, a long capacitor screen, 26 and a short capacitor screen.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

As shown in fig. 1-16: the embodiment is a bushing and voltage divider integrated extra-high voltage direct current valve side outlet bushing, which comprises a current-carrying pipe 1, a wall-penetrating flange 7, a hollow composite insulator 10, a wire holder 14, a pressure-equalizing ball 15, a lower sealing sleeve 17, a tail connecting seat 18 and an oil middle wiring board 19.

Referring to fig. 1-5, a capacitor core 2 is arranged on a tube body of a current-carrying tube 1, a plurality of layers of voltage-dividing capacitor screens 3 are sequentially rolled on the capacitor core 2 from inside to outside in a staggered manner, the number of the voltage-dividing capacitor screens 3 is n, n is not less than 3 and not more than 6, the voltage-dividing capacitor screens 3 on odd layers are sequentially connected in an equipotential manner from inside to outside, and the voltage-dividing capacitor screens 3 on even layers are sequentially connected in an equipotential manner; a plurality of insulating protective layers 4 are also rolled outside the voltage-dividing capacitive screen 3, and end screen leads 5 and voltage monitoring leads 6 which penetrate through the insulating protective layers 4 are respectively arranged on the two outermost voltage-dividing capacitive screens 3; when n =3, the voltage-dividing capacitive screen 3 of the even layer is directly connected with the end screen lead 5 or the voltage monitoring lead 6.

The capacitor core 2 penetrates through the wall-penetrating flange 7 from top to bottom and is fixedly connected with the wall-penetrating flange 7, and a tail screen terminal 8 connected with the tail screen lead 5 and a voltage monitoring terminal 9 connected with the voltage monitoring lead 6 are arranged on a tube body of the wall-penetrating flange 7.

Hollow composite insulator 10 cover is established in current-carrying pipe 1 and 2 upper ends of electric capacity core, the lower extreme and the wall flange 7 of hollow composite insulator 10 are connected, the upper end of hollow composite insulator 10 is provided with head connecting seat 11, current-carrying pipe 1's top interlude head connecting seat 11 and extend to hollow composite insulator 10 top, form the accommodation space between hollow composite insulator 10 and the electric capacity core 2, it is filled with insulating filling medium 12 to pack in the accommodation space, and all be provided with fixed cover 13 at the both ends of hollow composite insulator 10, hollow composite insulator 10 is through fixed cover 13 and the wall flange 7 that wears that corresponds, head connecting seat 11 bolted connection.

The wire holder 14 is sleeved at the top end of the current-carrying tube 1 above the hollow composite insulator 10 and is fixedly connected with the head connecting holder 11; the pressure equalizing ball 15 is covered on the outer side of the top end of the hollow composite insulator 10 and is fixedly connected with the head connecting seat 11, the bottom of the head connecting seat 11 is provided with a shielding ball 16, the shielding ball 16 is inserted into the hollow composite insulator 10, and the current-carrying pipe 1 is inserted through the shielding ball 16; the lower sealing sleeve 17 is inserted into the tail ends of the current-carrying tube 1 and the capacitor core 2 from top to bottom and is abutted against the tail ends of the current-carrying tube 1 and the capacitor core 2; the tail connecting seat 18 is inserted into the lower sealing sleeve 17 from top to bottom and extends into the tail end of the current-carrying tube 1; an in-oil terminal plate 19 is provided at the bottom of the tail connector socket 18.

Still be provided with upper gland 20 at the top of electric capacity core 2, upper gland 20 cover is established on current-carrying tube 1, upper gland 20 insert electric capacity core 2 and the current-carrying tube 1 between the clearance and with electric capacity core 2's tip butt, still overlap on the current-carrying tube 1 that is located upper gland 20 top and be equipped with retainer plate 21, retainer plate 21 and upper gland 20 fixed connection.

The capacitor core 2 is extended to two ends in a certain gradient, a lower end flange opening of the through-wall flange 7 is abutted to the notch of the stepped groove below the capacitor core 2 to support the capacitor core 2, an upper end flange opening of the through-wall flange 7 is abutted to the outer wall of the large-caliber section of the notch of the stepped groove above the capacitor core 2, the capacitor core 2 is sleeved with a fixing ring 22 abutted to the notch of the stepped groove above the capacitor core 2, and the fixing ring 22 is fixedly connected with the upper end flange opening of the through-wall flange 7.

The capacitor core 2 comprises a coiled pipe 23, a plurality of groups of insulating corrugated paper layers 24, a plurality of groups of short capacitor screen layers and a plurality of groups of long capacitor screen layers, wherein the coiled pipe 23 is sleeved outside a pipe body of the current-carrying pipe 1, the plurality of groups of insulating corrugated paper layers 24, the plurality of groups of short capacitor screen layers and the plurality of groups of long capacitor screen layers are sequentially and alternately coiled on the outer wall of the coiled pipe 23 from inside to outside and are coiled with one insulating corrugated paper layer 24 outside the outermost long capacitor screen layer, each layer of long capacitor screen layer comprises one long capacitor screen 25, each layer of short capacitor screen layer comprises two short capacitor screens 26 which are coiled in a staggered mode, and one insulating corrugated paper layer 24 is coiled between the two adjacent short capacitor screen layers, between the two adjacent long capacitor screen layers and between the adjacent short capacitor screen layer and the long capacitor screen layer.

Through holes are respectively formed in the long capacitive screen 25 and the short capacitive screen 26, and after the long capacitive screen 25 and the short capacitive screen 26 are rolled, the through holes on the long capacitive screen 25 and the short capacitive screen 26 are in a spiral shape which outwards diffuses by taking the current-carrying tube 1 as a center; the number of the insulating corrugated paper layers 24 of each group is at least 1, the number of the short capacitive screens 26 of each group is 1-3, and the number of the long capacitive screens of each group is 1-8.

When practical application, insulating wrinkle paper layer 24, short electric capacity screen layer and long electric capacity screen layer can directly roll up and make on current-carrying pipe 1, can save roll up pipe 23, realize the current-carrying effect and roll up the system effect through current-carrying pipe 1, the discharge phenomenon that appears when can effectually avoiding adopting double conduit reaches the purpose of simplifying the structure simultaneously, promotes the equipment ease and reduction in production cost.

Referring to fig. 6 to 9, the capacitor core 2 in this embodiment is designed by using the concept of long and short capacitor screens and equal margin, and the design concept is as follows (the upper and lower portions of the letters defined in fig. 6 to 9 have no practical meaning, and are only used to distinguish the capacitor screens at the upper and lower ends):

two long capacitive screens 25, one short capacitive screen 26 above and below, the schematic layout and equivalent circuit diagram of the capacitive screens are shown in fig. 6 and 7;

two long capacitive screens 25, two short capacitive screens 26 respectively at the upper and lower sides, the schematic layout diagram and the equivalent circuit diagram of the capacitive screens are shown in fig. 8 and 9;

wherein the content of the first and second substances,

the length of the capacitive screen is defined as L _n ；

The step difference between the capacitive screens is defined as λ _n ；

The radius of the capacitive screen is defined as r _n ；

The capacitance between the two capacitive screens is calculated as:

in the formula of _r Is a relative dielectric constant,. Epsilon ₀ Is a vacuum dielectric constant;

the radial electric field between the two capacitive screens is calculated as:

in the formula, U is the partial pressure of each layer of capacitive screen;

the partial pressure of each layer can be calculated according to the capacitance partial pressure principle through an equivalent circuit diagram;

the axial electric field between the two capacitive screens is calculated as:

the partial discharge starting voltage at the edge of each layer of capacitive screen is calculated as:

the local discharge initial voltage margin of each layer of capacitive screen is as follows:

by adjusting the thickness of the layer, the step difference and the length of the capacitive screen, the margin of the partial discharge starting voltage of each layer of the capacitive screen is equal, and the equal-margin capacitive core can be obtained.

In this embodiment, the electrical parameters corresponding to the voltage-dividing capacitive screen 3 also satisfy the above-mentioned formulas.

In practical applications, the number of the voltage dividing capacitive screen 3 may be 3, 4, 5, or 6, and the following description will take 4 voltage dividing capacitive screens 3 as an example.

The arrangement schematic diagram, the equivalent circuit diagram and the simplified equivalent circuit diagram of the voltage-dividing capacitive screen 3 of the 4 layers of screens are shown in fig. 10-15, and the two modes are divided into two modes that the outermost voltage-dividing capacitive screen 3 is connected with a tail screen lead 5 and the outermost voltage-dividing capacitive screen 3 is connected with a voltage monitoring lead 6, wherein a C sleeve is an equivalent capacitor corresponding to a main capacitive screen consisting of long and short capacitive screens, C1, C2, C3 and C4 are equivalent capacitors corresponding to the voltage-dividing capacitive screens 3 from inside to outside respectively, and C5 is an equivalent capacitor between the secondary inner voltage-dividing capacitor 3 and the main capacitive screen.

Referring to fig. 10-12, the outermost partial pressure capacitive screen 3 is connected to the end screen lead 5: the voltage division capacitors C2, C3 and C4 are connected in parallel and then connected in series with the capacitor C1, and then connected in parallel with the capacitor C5 and then connected in series with the capacitor C.

Referring to fig. 12 to 15, the outermost voltage-dividing capacitive screen 3 is connected to a voltage monitoring lead 6: the voltage division capacitors C2, C3 and C4 are connected in parallel and then connected in series with the capacitor C5, and then connected in parallel with the capacitor C1 and then connected in series with the capacitor C.

Due to the voltage division of the series capacitor; the equivalent capacitance of the parallel capacitor is equal to the sum of the capacitances of the capacitors; the voltage dividing process of the voltage dividing capacitive screen 3 can be summarized as follows: c1 and C5 of the voltage division capacitive screen 3 are connected in parallel and then connected in series with an equivalent capacitor C sleeve of a main capacitive screen consisting of long and short capacitive screens for voltage division, and then the sum of the voltage division capacitors C2, C3 and C4 connected in parallel is connected in series with C1 or C5 for voltage division.

Basic principle of capacitive voltage division:

the primary ac voltage is defined as U1, and the divided output voltage is defined as U2, which is schematically shown in fig. 16,

in fig. 16, C6 is the bushing capacitance, C7 is the voltage divider equivalent capacitance, and according to kirchhoff's voltage law, the following can be obtained:

U2＝U1*C6/(C6+C7)。

by combining the structure and the principle, the voltage division voltage screen is arranged on the capacitor core of the sleeve to form an integrated structure of the sleeve and the voltage divider, so that the problem of fault defects of the external voltage divider is thoroughly solved, and the running reliability of the sleeve on the valve side is improved; adopt equipotential connection between the partial pressure voltage screen, through the inside partial pressure of partial pressure voltage screen monitoring casing, avoided outside interference, promote voltage monitoring reliability.

And the voltage screen adopts a multilayer screen cross equipotential connection mode, the number of layers of the voltage screen, the thickness of the voltage screen layer and the length of the voltage screen can be designed according to the required voltage division ratio, and the applicability is improved.

In addition, in practical application, a voltage monitoring lead or a tail screen lead of the voltage dividing screen is led out from the voltage dividing screen, a tail screen terminal and a voltage monitoring terminal are arranged on the wall-penetrating flange, and other online monitoring equipment can be installed to realize real-time monitoring of dielectric loss, capacitance and partial discharge of the sleeve

Example 2: based on the bushing and voltage divider integrated extra-high voltage direct current valve side outlet bushing structure disclosed in embodiment 1, the embodiment discloses a manufacturing method based on the bushing and voltage divider integrated extra-high voltage direct current valve side outlet bushing, which comprises the following steps:

the method comprises the following steps: pretreatment: cutting and drying the insulating crepe paper according to the size requirement; punching the long capacitive screen 25, the short capacitive screen 26 and the voltage-dividing capacitive screen 3 by using a full-automatic electric Rong Bing punching machine to control the size and the position of the holes;

step two: and (3) rolling the capacitor core 2: wiping the coiled pipe 23 and then fixing the coiled pipe on a coiling machine, sequentially coiling insulating crepe paper, a long capacitance screen 25 and a short capacitance screen 26 on the coiled pipe 23 according to the structure of the capacitance core 2, and realizing hole position staggering of an upper screen and a lower screen by controlling the step difference of each screen, the initial angle of coiling the capacitance screen and the punching position on the capacitance screen;

step three: coiling a voltage-dividing capacitive screen 3: according to the process requirements, a plurality of layers of voltage-dividing capacitive screens 3 are sequentially rolled on the capacitive cores 2 in a staggered manner, then from inside to outside, the voltage-dividing capacitive screens 3 of odd layers are sequentially connected in an equipotential manner, and the voltage-dividing capacitive screens 3 of even layers are sequentially connected in an equipotential manner;

before the outermost partial pressure capacitive screen 3 is rolled, a fabrication hole is cut at the installation position corresponding to the end screen lead 5 or the voltage monitoring lead 6, so that the end screen lead 5 or the voltage monitoring lead 6 on the subsequent inner partial pressure capacitive screen 3 can conveniently penetrate out;

step four: rolling the insulating protective layer 4: a plurality of insulating protective layers 4 are rolled outside the voltage-dividing capacitive screens 3, process holes are formed in the insulating protective layers 4 to enable the insulating protective layers to correspond to positions of two voltage-dividing capacitive screens 3 positioned on the outer layer, wherein tail screen leads 5 or voltage monitoring leads 6 are arranged on the two voltage-dividing capacitive screens 3, and the tail screen leads 5 or the voltage monitoring leads 6 penetrate through the corresponding process holes and are respectively welded on the two voltage-dividing capacitive screens 3 on the outer layer correspondingly;

step five: and (3) vacuum drying: unloading the rolled core body from the rolling machine, and transferring the core body into a vacuum drying tank for vacuum drying;

step six: vacuum pouring: after the core body is dried, carrying out vacuum epoxy casting and curing molding on the core body;

step seven: the core machine is added with: transferring the cured and molded core body into a machining workshop for machining the outside of the core body;

step eight: assembling: testing the machined core body, and assembling all components of the sleeve according to the product structure after the core body is qualified;

step nine: and (3) post-treatment: and (4) performing finished product test on the assembled sleeve, then sequentially performing inspection-packaging-re-inspection treatment, and warehousing for delivery after the inspection is qualified.

The pressure of an upper compression roller of the rolling machine is 10kg, the rolling tension is 30kg, the tension of an unwinding roller is 5kg, and the heating temperature of a hot roller is 90 +/-5 ℃; the rolling speed is as follows: 0.5-1m/min.

The equipotential connection method of the voltage-dividing capacitive screen 3 in the third step is as follows:

when the voltage-dividing capacitive screens 3 are rolled in a staggered mode in sequence, the upper end portions of the voltage-dividing capacitive screens 3 of the odd layers positioned on the inner side are rolled with insulating crepe paper to form equipotential aluminum foils or copper sheets, and the other ends of the equipotential aluminum foils or copper sheets are connected with the voltage-dividing capacitive screens 3 of the odd layers adjacent to the outer layer; the lower end part of the even-numbered layer of the voltage-dividing capacitive screen 3 positioned at the inner side is coiled with the insulating crepe paper to form an equipotential aluminum foil or copper sheet, and the other end of the equipotential aluminum foil or copper sheet is connected with the even-numbered layer of the voltage-dividing capacitive screen 3 adjacent to the outer layer; or

After the partial pressure capacitive screen 3 is rolled, holes are formed in the upper end of the partial pressure capacitive screen 3 on the odd-numbered layer, holes are formed in the lower end of the partial pressure capacitive screen 3 on the even-numbered layer, and equal potential connection between the partial pressure capacitive screens 3 is achieved by welding copper wires between the two partial pressure capacitive screens 3 on the corresponding odd-numbered layer and the corresponding partial pressure capacitive screens 3 on the even-numbered layer.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (7)

1. The utility model provides a sleeve pipe, special high voltage direct current valve side outlet wire sleeve of voltage divider integral type which characterized in that includes:

the current-carrying tube is characterized in that a capacitor core is arranged on a tube body of the current-carrying tube, a plurality of layers of voltage-dividing capacitor screens are sequentially and alternately rolled on the capacitor core from inside to outside, the number of the layers of the voltage-dividing capacitor screens is n, n is not less than 3 and not more than 6, the voltage-dividing capacitor screens on odd layers are sequentially connected in an equipotential manner from inside to outside, and the voltage-dividing capacitor screens on even layers are sequentially connected in an equipotential manner; a plurality of insulating protective layers are also rolled outside the voltage-dividing capacitive screen, and end screen leads and voltage monitoring leads which penetrate through the insulating protective layers are respectively arranged on the two outermost voltage-dividing capacitive screens;

the capacitor core penetrates through the wall-penetrating flange from top to bottom and is fixedly connected with the wall-penetrating flange, and a tube body of the wall-penetrating flange is provided with a tail screen terminal connected with a tail screen lead and a voltage monitoring terminal connected with a voltage monitoring lead;

the hollow composite insulator is sleeved at the upper ends of the current-carrying tube and the capacitor core, the lower end of the hollow composite insulator is connected with the through-wall flange, the upper end of the hollow composite insulator is provided with a head connecting seat, and the top end of the current-carrying tube penetrates through the head connecting seat and extends to the upper part of the hollow composite insulator;

the wire holder is sleeved at the top end of the current-carrying tube above the hollow composite insulator and is fixedly connected with the head connecting seat;

the pressure equalizing ball is covered on the outer side of the top end of the hollow composite insulator and is fixedly connected with the head connecting seat;

the lower sealing sleeve is inserted into the tail ends of the current-carrying tube and the capacitor core from top to bottom and is abutted against the tail ends of the current-carrying tube and the capacitor core;

the tail connecting seat is inserted into the lower sealing sleeve from top to bottom and extends into the tail end of the current-carrying pipe;

and the oil middle wiring board is arranged at the bottom of the tail connecting seat.

2. The bushing and voltage divider integrated extra-high voltage direct current valve side outlet bushing according to claim 1, wherein an accommodating space is formed between the hollow composite insulator and the capacitor core, and insulating filling media are filled in the accommodating space.

3. The bushing and voltage divider integrated extra-high voltage direct current valve side outlet bushing according to claim 1, wherein a shielding ball is arranged at the bottom of the head connecting seat, the shielding ball is inserted into the hollow composite insulator, and a current-carrying pipe is inserted through the shielding ball.

4. The bushing and voltage divider integrated extra-high voltage direct current valve side outgoing line bushing as claimed in claim 1, wherein fixing sleeves are arranged at both ends of the hollow composite insulator, and the hollow composite insulator is connected with the corresponding wall-through flange and the head connecting seat through bolts.

5. The bushing and voltage divider integrated extra-high voltage direct current valve side outlet bushing according to claim 1, wherein an upper sealing sleeve is further arranged at the top of the capacitor core, the upper sealing sleeve is sleeved on the current-carrying tube, the upper sealing sleeve is inserted into a gap between the capacitor core and the current-carrying tube and abutted against the end of the capacitor core, a fixing ring is further sleeved on the current-carrying tube above the upper sealing sleeve, and the fixing ring is fixedly connected with the upper sealing sleeve.

6. The bushing and voltage divider integrated extra-high voltage direct current valve side outgoing line bushing according to claim 1, wherein the capacitor core extends towards two ends in a certain gradient, a lower end flange opening of the through-wall flange is abutted with a stepped groove notch below the capacitor core to support the capacitor core, an upper end flange opening of the through-wall flange is abutted with an outer wall of a large-caliber section at the stepped groove notch above the capacitor core, a fixing ring is sleeved on the capacitor core and abutted with the stepped groove notch above the capacitor core, and the fixing ring is fixedly connected with the upper end flange opening of the through-wall flange.

7. The bushing and voltage divider integrated extra-high voltage direct current valve side outgoing line bushing as claimed in claim 1 or 6, wherein the capacitor core comprises a rolled pipe, a plurality of groups of insulating corrugated paper layers, a plurality of groups of short capacitor screen layers and a plurality of groups of long capacitor screen layers, the rolled pipe is sleeved outside the current-carrying pipe body, the plurality of groups of insulating corrugated paper layers, the plurality of groups of short capacitor screen layers and the plurality of groups of long capacitor screen layers are wound on the outer wall of the rolled pipe from inside to outside alternately and sequentially, and one insulating corrugated paper layer is wound outside the long capacitor screen layer positioned at the outermost layer, each long capacitor screen layer comprises one long capacitor screen, each short capacitor screen layer comprises two short capacitor screens wound in a staggered manner, and one corrugated paper layer is wound between two adjacent short capacitor screen layers, between two adjacent long capacitor screen layers and between the adjacent short capacitor screen layer and the long capacitor screen layer;

through holes are respectively formed in the long capacitive screen and the short capacitive screen, and after the long capacitive screen and the short capacitive screen are rolled, the through holes in the long capacitive screen and the short capacitive screen are in a spiral shape which outwards diffuses by taking the current-carrying tube as a center;

the number of layers of the insulating corrugated paper layer of each layer set is at least 1, the number of layers of the short capacitive screen of each layer set is 1-3, and the number of layers of the long capacitive screen of each layer set is 1-8.

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