CN114243525B

CN114243525B - All-in-one turns on

Info

Publication number: CN114243525B
Application number: CN202111537769.3A
Authority: CN
Inventors: 陈晓凌; 陈晓鸣; 刘明矿; 李松恩
Original assignee: Jiangsu Ankura Smart Transmission Engineering Technology Co ltd
Current assignee: Jiangsu Ankura Smart Transmission Engineering Technology Co ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2023-07-04
Anticipated expiration: 2041-12-15
Also published as: CN114243525A

Abstract

The application provides a switch all-in-one. This application is through gas insulated bushing with main transformer and GIS equipment with hard tube mode airtight connection as a whole to through turning to the structure with GIS equipment along main transformer side parallel arrangement, not only compressed the insulating distance between the equipment, but also can make full use of main transformer long limit side space, compression GIS equipment area. According to the method, under the premise of ensuring reliable and stable gas insulation, the main transformer and the GIS equipment are compactly installed on the rectangular field through the optimization of the arrangement mode of the GIS equipment, the field area utilization rate is improved, and the power transformation requirement of a large-capacity small field is met. The design is full insulation connection form between main transformer and the GIS equipment of this application, and connecting wire does not expose in the air between the two, consequently, the opening becomes all-in-one of this application does not receive abominable natural climate environment and external animal's influence completely, has high factor of safety, can satisfy the requirement to safe and reliable performance to the customer.

Description

All-in-one turns on

Technical Field

The application relates to the technical field of power transformers, in particular to a switching all-in-one machine.

Background

The transformer substations are divided into indoor, semi-indoor and outdoor transformer substations according to the building form and the arrangement mode of the electrical equipment. The outdoor transformer substation needs to connect primary equipment such as a main transformer, a GIS and the like together according to a preset wiring scheme.

In a typical outdoor high-voltage transformer substation, all outgoing line bushings of a main transformer are usually oil-air bushings, and outgoing line positions of GIS equipment are usually SF 6-air bushings.

The main transformer and the GIS equipment of the existing outdoor high-voltage transformer substation are usually arranged separately and independently. The oil-air bushing at the high-voltage side of the main transformer is connected with the SF 6-air bushing at the interval outlet of the GIS equipment main transformer through a soft overhead line.

The neutral point grounding device of the existing outdoor high-voltage transformer substation needs to be independently installed on a stand column bracket near a main transformer and is connected with a neutral point side oil-air sleeve of the main transformer through a soft overhead line.

The low-voltage side of a main transformer in the existing outdoor high-voltage transformer substation is usually provided with a pure magnetic sleeve. The pure magnetic sleeve is connected with the tubular bus or bus bar, and the low-voltage tubular bus or bus bar is exposed in the air.

In the traditional scheme, all the sleeves and the electrified connection contact parts are exposed in the air, and the connection mode of the sleeves and the outgoing lines is open, so that a larger occupied area is required. In addition, the existing GIS equipment is usually arranged perpendicular to the length direction of the main transformer, so that a sufficient air space is reserved at the side part of the transformer to install and connect the GIS equipment.

Disclosure of Invention

This application provides a division becomes all-in-one to the not enough of prior art, and this application is connected main transformer and GIS equipment as an organic whole through gas insulated sleeve, makes it arrange side by side, has compressed the required insulating distance of soft overhead line, and the cooperation is to the optimization of main transformer structure, can effectively compress the all-in-one to connect the gained division and become all-in-one installation place area. The variable-voltage output device can provide high-capacity and high-reliability variable-voltage output in a small space place. The application specifically adopts the following technical scheme.

First, to achieve the above object, an all-in-one machine is provided, which includes: the main transformer comprises a main structure and high-pressure oil-SF 6 bushings, each high-pressure oil-SF 6 bushing is respectively connected with one phase in a high-pressure outlet of the main transformer, each phase of high-pressure oil-SF 6 bushing is horizontally arranged at the top of one side of the main structure along the length direction of the main structure, and the height of each high-pressure oil-SF 6 bushing is lower than that of the main structure of the main transformer; one end of the gas insulating sleeve is fixedly connected with the high-pressure oil-SF 6 sleeve, and the other end of the gas insulating sleeve is fixedly connected with the GIS equipment; the GIS equipment comprises a plurality of groups of installation underframes which are horizontally arranged on one side of the high-pressure oil-SF 6 sleeve in parallel with the length direction of the main transformer and electrical elements which are arranged on the installation underframes, wherein the installation underframes of the groups are sequentially arranged in parallel along the length direction of the high-pressure oil-SF 6 sleeve, and the electrical elements arranged on the installation underframes of the groups are sequentially connected with the high-pressure oil-SF 6 sleeve in series through a steering structure; the oil storage cabinet is internally provided with insulating oil, is fixedly arranged at the top of the main transformer main body structure, is provided with a main gas pipe arranged between the oil storage cabinet and a main transformer installation gap, and is communicated with a pressure adjusting channel inside the oil storage cabinet, and the pressure adjusting channel horizontally extends from the top of the oil storage cabinet to the edge of the side wall of the main transformer and then bends and extends downwards to the lower part of the side wall of the main transformer; the air cooler is arranged on the end face of the other side of the main transformer main body structure, and insulating oil of the coil is directly introduced into the air cooler through an oil guide pipe of the main transformer so as to reduce the temperature of the insulating oil in the main transformer.

Optionally, the all-in-one switch machine according to any one of the above, wherein each group of installation underframe is provided with electric elements respectively matched with three phases of the main transformer side by side; the steering structure includes: the three-phase converging sleeve body is parallel to the main transformer and the mounting underframe and is arranged between the main transformer and the mounting underframe, three sleeve connecting ports are arranged at the top of the three-phase converging sleeve body, each sleeve connecting port is electrically connected with a corresponding phase of high-pressure oil-SF 6 sleeve through a phase of gas insulating sleeve, conductors which are respectively matched with the three sleeve connecting ports are arranged in the three-phase converging sleeve body in parallel, the conductors are fixedly connected through insulating connectors, and each conductor is electrically connected with a phase of high-pressure oil-SF 6 sleeve; the first end of the steering sleeve is connected with one side of the three-phase converging sleeve body, three groups of 90-degree steering conductors which are parallel to each other are arranged in the steering sleeve at intervals, and each 90-degree steering conductor is electrically connected with one phase of conductor in the three-phase converging sleeve body; the three-phase separation sleeve body is parallel to the high-pressure oil-SF 6 sleeve and connected to the second end of the steering sleeve or arranged on one side of an electric element on the installation underframe, three element connection ports are arranged on the side part of the three-phase separation sleeve body, each element connection port is electrically connected with one phase of electric element on the installation underframe, inner conductors which are respectively matched with the three-phase element connection ports are arranged in parallel in the three-phase separation sleeve body, the inner conductors are fixedly connected through insulating connectors, and each inner conductor is electrically connected with one phase of steering conductor; the inter-group telescopic connecting sleeve is connected between three-phase separating sleeve bodies arranged on the side parts of two adjacent mounting underframes, and each phase of inner conductors in the three-phase separating sleeve bodies are respectively connected in series.

Optionally, the all-in-one switch machine according to any one of the above, wherein the main transformer is provided with: three-phase coils sequentially arranged along the length direction of the main transformer main body structure; the three-phase high-voltage outgoing lines are respectively connected with the three-phase coils, are respectively led out upwards to the top of the same side of the main transformer main body structure, are respectively and horizontally outwards bent at the top of the main transformer and are respectively connected to a phase of high-pressure oil-SF 6 sleeve, and are led out horizontally outwards from the high-pressure oil-SF 6 sleeve.

Optionally, the opening and transformation integrated machine according to any one of the above, wherein each phase of high-pressure oil-SF 6 sleeve is horizontally connected with and matched with the phase of gas insulation sleeve, and support bars supported on the outer side of the main transformer box body are respectively arranged on the lower side of each phase of high-pressure oil-SF 6 sleeve.

Optionally, the switching all-in-one machine according to any one of the preceding claims, wherein the neutral point of the main transformer is grounded through a gas-insulated neutral point grounding device, and the low-voltage bushing of the main transformer is a cable plug-type bushing.

Optionally, the all-in-one switching machine according to any one of the preceding claims, wherein the gas-insulated neutral point grounding device comprises a parallel connection between the main transformer neutral point and ground level: a lightning arrester, a disconnector and/or a discharge gap.

Optionally, the all-in-one switch of any one of the above, wherein the isolating switch includes: the first metal shell is in sealing connection with the gas-insulated shell at the top of the main transformer and is commonly grounded; the static contact is arranged in the gas-insulated tube shell at the top of the main transformer and is electrically connected with the neutral point of the transformer; the upper part of the moving contact is electrically connected with the first metal shell in a sliding way, the bottom end of the moving contact is electrically contacted with the fixed contact when the moving contact slides to the bottom position of the first metal shell, and the bottom end of the moving contact is separated from the fixed contact when the moving contact slides to the top position of the first metal shell; the switch induction coil is arranged on the periphery of the moving contact and is positioned in the first metal shell, and the moving contact penetrates through the switch induction coil to trigger the switch induction coil to induce the grounding current passing through the moving contact.

Optionally, the switching all-in-one machine according to any one of the preceding claims, wherein the discharge gap includes: the second metal shell is in sealing connection with the gas-insulated shell at the top of the main transformer and is commonly grounded; the upper part of the conducting rod is electrically connected with the top of the second metal shell in a sliding way, and the bottom of the conducting rod is fixedly and electrically connected with a movable side ball head; the gap induction coil is arranged on the periphery of the conducting rod and is positioned in the second metal shell, and the conducting rod penetrates through the gap induction coil to trigger the gap induction coil to detect the current in the conducting rod; the static side ball head is fixedly arranged in a gas-insulated tube shell at the top of the main transformer and is electrically connected with a neutral point of the transformer; the movable side ball head is positioned in the second metal shell and above the static side ball head, and insulating gas is filled between the movable side ball head and the static side ball head; when the conducting rod slides to the top position of the second metal shell, insulation is kept between the movable side ball head and the static side ball head; when the conducting rod slides to the bottom of the second metal shell, the electric conduction rod breaks through an insulating gas gap between the movable ball head and the static ball head to discharge.

Optionally, the all-in-one switch machine according to any one of the above, wherein the oil storage cabinet includes: the main oil storage cabinet is provided with a flat polygonal column structure, and capsules are contained in the main oil storage cabinet; the switch oil storage cabinet is arranged on one side end face of the main oil storage cabinet and is independent of the main oil storage cabinet; the main gas pipe is arranged in an installation gap between the main oil storage cabinet and the main transformer, one end of the main gas pipe is connected with the bottom of the main oil storage cabinet, the other end of the main gas pipe is connected with the main transformer, and the main gas pipe has a gradient of not less than 2 degrees from the inclination upward of a main transformer box cover; the capsule lifting seat is arranged at the top end of the main oil storage cabinet, is fixedly connected with the top of the capsule, and forms a gas accommodating cavity in a sealing manner between the top of the capsule and the top end of the capsule lifting seat; the respiration channel is communicated with the inside of the capsule through the capsule lifting seat and extends to the lower part of the side wall of the main transformer from the capsule lifting seat to adjust the respiration state of the capsule; and the vacuumizing channel is communicated with the gas accommodating cavity, extends from the top of the capsule lifting seat to the lower part of the side wall of the main transformer and is used for adjusting the air pressure in the gas accommodating cavity.

Optionally, the opening and transformation integrated machine according to any one of the preceding claims, wherein the capsule lifting seat comprises: the lifting seat main body is connected with the top end of the main oil storage cabinet and is provided with an opening at the top; the capsule lifting seat cover plate is in sealing connection with the lifting seat main body and seals the opening; the top of the capsule connecting flange is in sealing connection with the cover plate of the capsule lifting seat, the bottom of the capsule connecting flange is in sealing connection with the top of the capsule, and a flange channel is arranged in the capsule connecting flange and communicated with the inside of the capsule; the bottom of the respirator pipe joint is connected with the capsule lifting seat cover plate into a whole, and the top of the respirator pipe joint is connected with the breathing channel; the main oil storage cabinet air release plug is arranged on the capsule lifting seat cover plate and is communicated with the vacuumizing channel and the gas accommodating cavity; a first sealing ring is arranged between the capsule lifting seat cover plate and the capsule connecting flange; a second sealing ring is arranged between the capsule lifting seat cover plate and the lifting seat main body; the second sealing ring is arranged outside the first sealing ring in a surrounding mode.

Advantageous effects

This application is with main transformer and GIS equipment through gas insulated bushing with hard tube mode airtight connection as a whole to through turning to the structure with GIS equipment along main transformer side parallel arrangement, not only compressed the insulating distance between the equipment, but also can make full use of main transformer long limit side space, adjust the GIS equipment by the arrangement mode of original perpendicular to main transformer into being on a parallel with main transformer, cooperate in a plurality of groups of electrical component that main transformer length dimension was arranged, can effectively compress the size requirement to installation place length direction, reduce the required installation place area of GIS equipment. According to the hard connection structure, under the premise of guaranteeing reliable and stable gas insulation, the main transformer and GIS equipment are compactly installed on a rectangular field by matching with the optimization of the wiring mode of the high-voltage outgoing lines in the main transformer and the structure and arrangement mode of the external transformer, the installation distance between the compression equipment is increased, the utilization efficiency of a transformer station field is improved, and the power transformation requirement of a large-capacity small field is met. Because the design is the full insulation connection form between main transformer and the GIS equipment of this application, connecting wire does not expose in the air between the two, consequently, the opening becomes all-in-one of this application does not receive adverse nature climate environment and external animal's influence completely, has high factor of safety, can satisfy the customer to the requirement of safe and reliable performance to need not to consider the outside electrical insulation distance requirement when electrified operation, this application can also very big convenient daily electrified inspection and maintenance.

Further, this application is through carrying out a series of optimizations to main transformer oil tank inside design and interior air distance, the cooperation has reduced the overall dimension of high-capacity main transformer by a wide margin to the optimization of oil storage cabinet and cooler appearance and mounted position, in addition to the optimization to GIS equipment pipeline trend, adjust the required length space of installation GIS for the unit structure that cooperates in main transformer length dimension to make total overall dimension after both integration satisfy the requirement of rectangle mounting site's outer limit size, satisfied the high-capacity small-size site demand. In particular, for avoiding the transformer high-voltage outgoing line side to be the bulge structure that reserves the shell insulation distance and produce, compress bulge structure and the installation interval between main transformer and the GIS equipment that high-voltage outgoing line side pipeline bending structure increased, this application is at the inside vertical upwards of leading out earlier of transformer three-phase high-voltage lead-out wire and outwards buckling of level to horizontal mode lug connection is to corresponding high-pressure oil-SF 6 sleeve pipe, thereby directly accomplish the 90 turns to high-voltage outgoing line side in transformer main part structure inside, guarantee that high-pressure oil-SF 6 sleeve pipe top height can not surpass main transformer top height. The high-pressure oil-SF 6 sleeve structure horizontally arranged on one side of the top of the main transformer can cancel the Z-shaped steering pipeline arranged on the outer side of the transformer in the traditional outgoing line mode, so that the installation space required by the pipeline structure of the opening-changing integrated machine is compressed. According to the method, the three-phase high-voltage outgoing line in the main transformer can be directly led out vertically upwards, then horizontally stretches out to directly separate and turn the three-phase line along the width direction of the transformer through the gas insulation sleeve, so that the three-phase line is directly matched with each phase of electric element on the installation underframe, and the electric connection between the main transformer and GIS equipment is realized by arranging the short-pipe arrangement distance. According to the high-voltage lead wire structure, the inner air distance between the high-voltage side of the internal coil and the width direction of the oil tank wall can be compressed, then the high-voltage lead wire is downwards bent and gathered by utilizing the space at the lower side of the main transformer and the high-voltage lead wire structure, 90-degree line steering is realized through the three-phase converging sleeve body and the steering sleeve, and the three-phase high-voltage conductor is respectively electrically connected with all phases of electric elements arranged on the GIS equipment installation underframe through the three-phase separating sleeve body arranged at the outer side of the end part of the installation underframe. Therefore, the high-voltage lead-out wire can compress the height space and the width space required by wiring, limit the long-side distance of the GIS equipment and the pipeline to be consistent with the long-side distance of the main transformer, fully utilize the installation space outside the long side of the main transformer, enable the high-voltage lead-out wire to be connected with each phase of the electrical element arranged on each installation chassis in series, and output a high-voltage signal.

According to the method, an oil-SF 6 bushing is adopted on the neutral point side of the main transformer, and the neutral point grounding is realized by using a closed gas insulation neutral point grounding device. The gas-insulated neutral point grounding device can be directly arranged on the neutral point lifting seat and integrated with the main transformer. The live connection parts such as high-voltage and neutral point bushings and wiring terminals are completely sealed in the GIL pipeline, the low-voltage bushings adopt cable plug head bushings to lead out cables, all bushings and outgoing line connections between the main transformer and GIS equipment are all in an all-insulated connection mode, and all the bushings, the wiring terminals and the outgoing lines are insulated or reliably grounded through the GIL shell pipeline when in live operation. Can meet the requirements of clients with extremely high requirements on safety and reliability.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and explain the application and do not limit it. In the drawings:

FIG. 1 is a schematic view of the overall structure of the all-in-one machine of the present application;

FIG. 2 is a block diagram of a side view of the integrated switch of the present application;

FIG. 3 is a schematic diagram of the internal high voltage outlet of the main transformer in the present application at a lateral viewing angle;

FIG. 4 is a schematic view of the instant application in a top view of the all-in-one machine;

FIG. 5 is a schematic diagram of a steering structure between a main transformer and GIS equipment in the present application;

FIG. 6 is a schematic illustration of a main oil reservoir configuration of the present application;

FIG. 7 is a schematic cross-sectional view of a capsule lifting seat in the main oil reservoir of FIG. 6;

FIG. 8 is a schematic view of a suspension of the capsule structure in the main tank of FIG. 6;

FIG. 9 is a schematic illustration of the side switch cabinet configuration of the main cabinet of FIG. 6;

FIG. 10 is a side view of a hand hole cover plate in the main oil reservoir of FIG. 6;

FIG. 11 is a cross-sectional view of a disconnecting switch employed in the switch-on and switch-off all-in-one machine of the present application;

FIG. 12 is a cross-sectional view of a discharge gap employed in the opening and transformation all-in-one machine of the present application;

FIG. 13 is a side cross-sectional view of an air cooler oil inlet pipe arrangement in an all-in-one machine of the present application;

FIG. 14 is a transverse cross-sectional view of an air cooler oil inlet pipe arrangement in an all-in-one machine of the present application;

FIG. 15 is a diagram comparing natural oil circulation cooling mode with forced oil circulation cooling mode in the present application;

Fig. 16 is a schematic diagram of the overall structure of the GIS device used in the present application.

In the figure, 1 represents a main oil reservoir; 10 denotes a capsule; 12 denotes a hook; 2 represents a capsule lifting seat; 20 denotes a capsule connecting flange; 21 denotes a respirator tube fitting; 22 denotes a capsule lifting seat cover plate; 23 denotes a main reservoir venting plug; 201 denotes a first seal ring; 202 denotes a second seal ring; 31 denotes a hand hole; 32 denotes a manhole; 33 represents an electrical laminate; 4 represents a gas relay; 41 denotes a butterfly valve at the end of the oil storage tank; 42 denotes a bellows; 43 denotes a box cover end butterfly valve; 44 denotes a cover connecting elbow; 5 represents a main oil tank respirator; 6, a breather of a switch oil storage cabinet is shown; 7, a switch oil storage cabinet; 70 denotes an oil level gauge; 701 denotes a rain cover; 71 denotes a switch oil tank venting plug; 72 denotes a respirator connection tube; 8 represents a valve; 9 represents a main transformer; 91 denotes a neutral point grounding device; 9111 denotes a first metal case; 9112 denotes a stationary contact; 9113 represents a moving contact; 9114 represents a switching induction coil; 9121 represents a second metal housing; 9122 represents a conductive rod; 9123 denotes a dynamic-side ball head; 9124 represents a gap induction coil; 9125 denotes a static ball head; 92 denotes an air cooler; 921 denotes an air cooler oil inlet pipe; 922 denotes a lower clip oil drain pipe; 923 shows a lower clamping piece U-shaped oil guide pipe; 93 denotes a high pressure oil-SF 6 bushing; 94 denotes a gas-insulated bushing; 9511 represents a three-phase junction box; 9512 represents a three-phase split sleeve body; 9513 represents an inter-group telescopic connection sleeve; 952 represents a telescopic joint; 953 represents a current transformer; 954 represents a circuit breaker; 955 denotes a circuit breaker operating mechanism; 956 represents an arrester; 957 represents a voltage transformer; 958 represents an isolator assembly; 9582 represents a ground switch; 959 shows a mounting chassis.

Detailed Description

In order to make the objects and technical solutions of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the present application based on the described embodiments.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The meaning of "and/or" as referred to in this application means that each exists alone or both.

The meaning of 'inside and outside' in the application refers to that the direction from the shell of the main oil storage cabinet to the inside of the capsule is inside, and vice versa; and not as a specific limitation on the device mechanisms of the present application.

As used herein, "connected" means either a direct connection between elements or an indirect connection between elements via other elements.

The meaning of "up and down" as used herein refers to the direction from the ground to the top of the capsule lifting seat being up when the user is facing the transformer, and vice versa, rather than specifically limiting the device mechanism of the present application.

Fig. 1 and 2 show a switching all-in-one machine according to the present application, which includes:

the main transformer 9, the high-voltage outlet terminal of which is directly connected to the GIS device through a gas-insulated GIL line, and the high-voltage oil-SF 6 bushing connected to the GIL line is generally led out from one side of the main transformer oil tank. Considering that the main transformer body structure is rectangular, the length dimension of the main transformer body structure is generally matched with the width dimension of the installation site, therefore, the main transformer 9 is preferably arranged on one side of the site by attaching the narrow side of the installation site, and the arrangement and installation of GIS equipment are realized by utilizing the whole rectangular space left in the long side direction of the installation site. In order to be matched with the arrangement mode, the high-voltage outgoing line can be arranged on the long side of the main transformer main body structure, so that the high-voltage outgoing line can be directly and outwards connected with GIS equipment arranged on the side part of the main transformer, the height of the high-voltage outgoing line end of the main transformer is reduced, and the arrangement distance of GIL pipelines is shortened;

The high-pressure oil-SF 6 sleeve 93 is respectively connected with one phase in the high-pressure outgoing line of the main transformer, the high-pressure oil-SF 6 sleeve 93 of each phase is respectively horizontally arranged at the top of one side of the transformer box along the length direction of the main transformer structure, and the height of the high-pressure oil-SF 6 sleeve 93 is lower than that of the main transformer 9 main structure; the neutral point of the main transformer 9 may also be grounded by a gas-insulated neutral point grounding device filled with SF 6; the low-voltage sleeve of the main transformer 9 can be realized by adopting a cable plug sleeve;

a gas insulating sleeve 94, which is a closed GIL hard pipe shown in fig. 5, one end of which is fixedly connected with a high-pressure oil-SF 6 sleeve 93 and the other end of which is fixedly connected with a GIS device, generally, a high-pressure oil-SF 6 sleeve 93 wire structure matched with the transformer of the present application, the gas insulating sleeve 94 may be arranged at the lower side of the high-pressure oil-SF 6 sleeve 93 wire structure, and connected between the transformer and the GIS device by using the lower space of the high-pressure oil-SF 6 sleeve 93;

the GIS device is configured to include the GIS device shown in fig. 16: GIL line 94, circuit breaker 954 (CB), isolation grounding switch assembly DES, fast grounding switch (FES), voltage transformer 957 (PT), current transformer 953 (CT), lightning arrester 956 (LA), etc., which are organically combined by several sets of mounting chassis 959 and gas insulated bushings connecting between the electrical components. The GIS device may be horizontally disposed on one side of the high-pressure oil-SF 6 bushing 93 parallel to the length direction of the main transformer 9 through a plurality of sets of installation underframes 959. The electrical components of each group of installation underframe 959 are connected in series by GIL hard tubes in sequence and are arranged in parallel and side by side along the length direction of the high-pressure oil-SF 6 sleeve 93. And the electrical components provided in each set of mounting chassis 959 are connected in series with the high pressure oil-SF 6 bushing 93 in turn by a steering arrangement. The electrical components arranged on each group of mounting underframe 959 have no fixed arrangement mode requirement, and can be arranged in any mode as long as the GIS equipment function can be realized. In some implementations, to compress space, the present application may lay the circuit breaker horizontally and match the GIS line run on the installation chassis 959 to the installation site. For example, the GIS equipment can be provided with the trend of pipelines matched with the outer limit sizes of the main transformer and the installation site, is designed integrally with the main transformer, is prefabricated in a factory and installed in a modularized manner, and has more compact and reasonable overall appearance arrangement. When the inner central conductor of the GIS equipment is directly connected with the high-pressure oil-SF 6 sleeve of the main transformer, a displacement adjusting device can be designed at the joint of the inner central conductor so as to facilitate installation and prevent displacement damage in the transportation process, and a shielding ring is arranged at the joint of the conductors so as to reduce the electric field intensity of the surface of the conductor at the joint. The external pipeline connection is provided with displacement adjusting devices in corresponding directions at two ends of the three-phase separation sleeve body 9512 so as to facilitate installation and prevent damage caused by displacement in the transportation process. It can be realized specifically by the structure shown in fig. 16: firstly, a high-pressure oil-SF 6 sleeve 93 at the rear end of the transformer main body is connected with a horizontally arranged gas insulation sleeve 94, and a space below the outer side of the oil tank through the gas insulation three-phase junction sleeve body 94 converts a high-pressure signal of the transformer into a horizontal direction and leads out the signal to the front side of the oil tank by utilizing the gas insulation sleeve 94 to be led out into a GIS circuit. The 90-degree steering position at the top of the three-phase converging sleeve body 9511 can be connected with a sealing bellows shell which is horizontally arranged as a displacement adjusting device to realize the adjustment of horizontal displacement, the tail end of the displacement adjusting device which is horizontally arranged is connected with a disconnecting switch assembly 958, and the tail end of the disconnecting switch assembly 958 is vertically connected with another sealing bellows shell as a displacement adjusting device in the vertical direction, so that a high-voltage signal output by the transformer main body is sent to a horizontal breaker operating mechanism 955 to control the on-off of the horizontal breaker operating mechanism. The breaker operating mechanism 955 is horizontally fixed at the bottom of the installation chassis 959, and the space above the breaker operating mechanism can be further utilized for installing a vertically arranged current transformer 953, and a grounding switch 9582 or a disconnecting switch assembly 958 horizontally connected to the top end of the current transformer 953, wherein the tail end of the grounding switch is horizontally led out backwards and is connected with another horizontally arranged three-phase junction sleeve 9511, and the three-phase junction sleeve 9511 is connected with a three-phase separation sleeve 9512 at the side part of the next installation chassis, so that reliable electric connection of electric elements on different chassis is realized. The next chassis can be correspondingly provided with a breaker 954, a disconnecting switch assembly 958, an expansion joint 952 and other devices, and finally, the overvoltage protection is realized through the disconnecting switch assembly 958, the voltage transformer 957, the lightning arrester 956 and the like which are vertically arranged at the bottom of the gas insulation sleeve 94 at the tail end of the chassis. From this, this application can multiplexing GIS part headspace is compressed into altitude space with longitudinal distance around the pipeline and is arranged, from this makes the trend of the pipeline of whole GIS equipment can with main transformer and installation place's outer limit size assorted, easy to assemble transportation.

Generally, in order to further ensure reliable connection between the main transformer and the GIS equipment, damage caused by displacement deviation in the transportation process is avoided, a displacement adjusting device realized by a telescopic bellows tube shell can be arranged between the connection parts of the main transformer and the GIS equipment, so that a longitudinal or transverse deflection and steering space is provided.

The oil storage cabinet is characterized in that the shell is arranged to have a flat octagonal cross-section shape and is transversely arranged on the main transformer to further reduce the height of the main transformer main structure, insulating oil is stored in the flat octagonal shell, the top of the insulating oil is sealed by a capsule, the oil storage cabinet can be arranged at the top of the main transformer 9 main structure through a fixed mounting frame, a main gas pipe can be arranged between the oil storage cabinet and a main transformer 9 mounting gap, and a pressure adjusting channel communicated with the interior of the oil storage cabinet can be matched with the main transformer outer box to extend horizontally from the top of the oil storage cabinet to the edge of the side wall of the main transformer 9 and then bend downwards to the lower part of the side wall of the main transformer 9;

and an air cooler 92 arranged on the other side end surface of the main transformer 9 main body structure and used for reducing the temperature of the insulating oil in the main transformer 9, wherein the connecting pipe at the upper part of the air cooler is horizontally led out so as to reduce the height space. The air cooler 92 of the present application eliminates the header pipe normally used for external connection of the cooler to reduce the width space, and the external header pipe is replaced by a lower clip header pipe 922 at the lower clip inside the oil tank in the manner shown in fig. 13 and 14, which is connected to the air cooler inlet pipe 921 from the bottom of the oil tank, without occupying the entire space. Compared with the conventional cooling mode of hanging fin type radiator on the tank wall, which is shown on the left side of fig. 15, the conventional cooling mode either needs to occupy a large width space or needs to be led out in a split manner and occupies a large length space, and cannot meet the limit requirement of the high-voltage transformer vehicle on the transportation size. This application cancels the radiator with the mode of fig. 15 right side and through the inside lower folder department U type lead oil pipe 923 of oil tank with the lower folder collect insulating oil in the oil pipe direct introduction air cooler 92 cooling back, the outside available space of oil tank is more spacious in this application, is favorable to the installation of external component.

Therefore, the main transformer of the all-in-one machine can adjust proper copper-iron proportion and body size when calculating an electromagnetic scheme, the air size in an oil tank and a GIS hard tube connecting structure are strictly controlled when being matched with structural arrangement, the trend of a pipeline is optimized by GIS, the total overall dimension of the main transformer and the GIS after installation and connection can be controlled in a rectangular installation field range, the gap between equipment can be small, the internal space of the whole installation field can be fully utilized for compact arrangement, transformer equipment can be installed, and high-capacity and high-reliability variable-voltage output can be realized in a small installation space.

Referring specifically to fig. 2 and 3, in order to reduce the total width of the oil tank and shorten the space between the high-voltage side of the coil and the wall of the oil tank, the present application may be provided with: the three-phase coil and the three-phase high-voltage outgoing line matched with the three-phase coil. The three-phase coils can be sequentially arranged along the length direction of the main body structure of the main transformer 9; and the three-phase high-voltage outgoing lines are respectively connected with the three-phase coils, and are vertically and upwards led out and then horizontally and outwards bent and connected to each phase of high-pressure oil-SF 6 sleeve 93, and are horizontally and outwards led out by the high-pressure oil-SF 6 sleeve 93, so that the fixed connection ends of the high-pressure oil-SF 6 sleeve 93 and the main transformer are horizontally and outwards connected. From this, main transformer can shorten its inside coil high pressure side and the epaxial sky distance of oil tank wall width, and the high pressure head is first vertical upwards to be drawn forth, and the wiring mode of directly outwards drawing forth to high pressure oil-SF 6 sheathed tube binding post department after leading the oil tank lateral wall after horizontal buckling again can guarantee inside electric distance, and cooperation high pressure oil-SF 6 sheathed tube arrangement position can further guarantee this application transformer steady operation.

In this application, compared with the vertical wire-out mode shown in the left side of fig. 3, the high-pressure oil-SF 6 sleeve 93 can avoid the bulge structure marked by the virtual coil formed at the bottom of the high-pressure oil-SF 6 sleeve 93 to ensure the insulation distance inside the device in the vertical wire-out mode. Under the scheme that each high-pressure oil-SF 6 sleeve 93 is horizontally led out from the top of the connecting platform, the high-pressure outgoing line of the main transformer can be directly bent in the main transformer structure box body so as to realize the pipeline butt joint in the direction directly matched with the GIL pipeline, thereby simplifying the steering matching structure between equipment. The lower side of the high-pressure oil-SF 6 sleeve 93 which horizontally extends out can be provided with a supporting bar which is connected with the outer side of the main transformer box body, and the supporting bar structure which is obliquely arranged provides auxiliary support to ensure the stability of the connecting part between the devices.

Therefore, the switching all-in-one machine can directly connect the high-voltage outgoing line of the main transformer with the GIS equipment through the GIL pipeline, and integrate the high-voltage outgoing line with the GIS equipment into a whole, so that the main transformer and the GIS equipment are organically combined into a whole. Three-phase oil-SF 6 sleeve pipe that draws through main transformer internal circuit, the optimization overall arrangement cooperation high-pressure side of outside box structure, the oil-SF 6 sleeve pipe that the neutral point side drawn forth, the cable plug head formula sleeve pipe that draws in the low pressure side to and the special short octagon or long circular oil storage cabinet that matches in main transformer box, and parts such as cooler that the side was arranged, GIS equipment, main transformer and the GIL pipeline of connecting both of this application can cooperate in the size of installation place and arrange to reduce cost of transportation and the requirement to the installation place.

Under other realization modes, the opening and transformation all-in-one machine can also utilize a plurality of groups of installation underframes, horizontally arrange various electric elements required by GIS equipment on each group of installation underframes according to installation size requirements, and then realize the connection between the transformer main body and each group of electric elements in a mode of fig. 2 or fig. 4 through the GIL pipeline with a steering structure, thereby forming the complete opening and transformation all-in-one machine. Wherein, each group of installation underframe is provided with electric elements which are respectively matched with three phases of the main transformer 9 in parallel; the steering structure connected between the main transformer and each group of GIS equipment comprises:

a three-phase junction bushing body 9511, which is disposed parallel to the main transformer 9 and the installation chassis 959, is installed therebetween by using a space on the lower side of the high-pressure oil-SF 6 bushing 93. Three sleeve connection ports are arranged at the top of the three-phase converging sleeve body 9511, each sleeve connection port is electrically connected with a corresponding phase of high-pressure oil-SF 6 sleeve 93 through a phase of gas insulation sleeve 94, conductors which are respectively matched with the three sleeve connection ports are arranged in parallel in the three-phase converging sleeve body 9511 in a mode shown in fig. 5, the conductors are fixedly connected through insulation connectors, and each conductor is electrically connected with a phase of high-pressure oil-SF 6 sleeve 93;

The steering sleeve is structured as shown on the right side of fig. 5, a first end of the sleeve is connected with one side of a three-phase converging sleeve body 9511, and is abutted with each phase conductor of the three-phase converging sleeve body 9511, three groups of 90-degree steering conductors which are parallel to each other are arranged in the steering sleeve at intervals, and each 90-degree steering conductor is electrically connected with one phase conductor of the three-phase converging sleeve body 9511;

a three-phase separation sleeve body 9512 parallel to the high-pressure oil-SF 6 sleeve 93 and connected to the second end of the steering sleeve or arranged at one side of the electrical component on the mounting chassis 959, wherein three component connection ports are arranged at the side of the three-phase separation sleeve body 9512, each component connection port is electrically connected with a phase of the electrical component on the mounting chassis 959, inner conductors respectively matched with the three-phase component connection ports are arranged in parallel inside the three-phase separation sleeve body 9512, each inner conductor is fixedly connected by an insulating connector, and each inner conductor is electrically connected with a phase of the steering conductor;

an inter-group telescopic connection sleeve 9513 connected between three-phase separation sleeve bodies 9512 provided at the side portions of adjacent two mounting underframes 959, and each phase of inner conductors in the three-phase separation sleeve bodies 9512 are connected in series, respectively.

Thus, the high-voltage signal output by the high-voltage oil-SF 6 bushing 93 is transmitted to one side of the mounting chassis 959 along the length direction of the transformer main body through the three-phase junction bushing body 9511, and then is turned to the connection direction of the electrical components on the mounting chassis 959 through the turning bushing, and the three-phase separation bushing body 9512 is used for respectively butting the electrical components of each phase, so that the regulation and control of the high-voltage output signal are realized. The second set of mounting chassis 959 also provides electrical connection to electrical components within the last set of mounting chassis 959 through a three-phase splitter sleeve 9512 such that high voltage signals are transmitted and controlled between the electrical components provided by each set of mounting chassis 959 in a zig-zag fashion.

Compared with the conventional GIS equipment, the GIS equipment is optimized in the following aspects:

1. SF 6-air sleeve which is led out from the main transformer interval of the original GIS equipment and is connected with the high-voltage outlet of the main transformer is eliminated.

2. The soft overhead line for connecting the main transformer and the GIS equipment is replaced by a closed GIL hard pipeline, the GIL pipeline is controlled to be connected with the GIS equipment main transformer at intervals, the pipeline shell 942 in fig. 4 is arranged, the sizes of the inner central conductor 941 and the disc insulator at the pipeline connection position are matched with the GIS size, the displacement adjusting device can be designed at the connection position of the inner central conductor 941 so as to facilitate the installation on site, and the shielding ring can be also optionally designed at the connection position of the conductor so as to reduce the electric field intensity at the connection position. Thus, after the connection is completed, the GIL pipeline can be integrated with the GIS device.

3. The connection interface of the integrated design main transformer and the GIS equipment is characterized in that displacement adjustment compensation devices are designed on the connection structure of the central conductor in the GIL and the external pipeline, bellows are respectively arranged on the external pipeline at the direct connection position of the shell of the external pipeline of the GIS equipment and the high-pressure oil-SF 6 sleeve of the main transformer in the height direction and the horizontal direction to serve as the displacement adjustment devices, the connection position is adjusted on site conveniently, and the installation connection of the main transformer and the GIS equipment is safer and more reliable.

4. When the main transformer and the GIS equipment are integrally designed and arranged, the trend of the GIS equipment pipeline is integrally designed and planned, so that the GIS equipment and the main transformer are more coordinated and matched, the overall appearance arrangement is more compact and reasonable, and the inspection maintenance is more convenient.

The GIS equipment obtained by the method can be matched with a main transformer with the following improved wire outlet mode, so that the compression of the whole assembly space of the switching-on and switching-off integrated machine is realized:

1. the outgoing line connection mode of the low-voltage side is changed from the connection of a conventional pure magnetic sleeve and a cable, and the connection of the outgoing line on the low-voltage side is changed into the connection of the cable through a cable plug head sleeve.

2. The outgoing line connection mode of the high-voltage side is changed from the conventional overhead line to be enclosed in the GIL pipeline.

3. The neutral point side outlet connection mode is changed from a conventional overhead line outlet into a closed neutral point grounding device in a pipeline, original open-connection neutral point grounding equipment is changed into a closed neutral point grounding device shown in fig. 11 and/or 12, the closed neutral point grounding device is directly arranged on a neutral point lifting seat of a main transformer horizontally led out from the upper part of a switch side box wall, the closed neutral point grounding device is directly arranged on the neutral point lifting seat by taking a horizontally arranged oil-SF 6 sleeve as a neutral point sleeve, and an inner central conductor of the closed neutral point grounding device is directly connected with the neutral point oil-SF 6 sleeve and is fused with the main transformer into a whole to effectively save the length space.

In particular, the gas-insulated neutral point grounding device in which the transformer neutral point is connected may include a gas-insulated neutral point grounding device connected in parallel to each other between the main transformer neutral point and the ground level: a lightning arrester, a disconnector or a discharge gap, or a combination of the above.

As shown in fig. 11, the isolating switch 911 may be further specifically configured to include:

a first metal housing 9111, which realizes a discharge path closely and commonly grounded with a gas-insulated shell at the top of the main transformer through flange structures at both ends of the top and the bottom and a metal cylinder or a conductive socket electrically connected between the two flange structures;

the static contact 9112 is arranged in a gas-insulated tube shell at the top of the main transformer and is electrically connected with the neutral point of the transformer through a common end conductor inner core;

the upper part of the moving contact 9113 is slidingly and electrically connected with the first metal housing 9111 through a moving contact seat made of conductive materials, the bottom end of the moving contact 9111 is electrically contacted with the fixed contact when the moving contact 9111 slides to the bottom position of the first metal housing 9111, and the bottom end of the moving contact 9111 is separated from the fixed contact when the moving contact 9111 slides to the top position of the first metal housing 9111, so that a grounding current path is formed in the moving contact;

the switch induction coil 9114 is disposed on the outer periphery of the moving contact 9113 and is located inside the first metal housing 9111, the center of the switch induction coil 9114 passes through the moving contact, the fixed structure on the inner side of the switch induction coil 9114 can block the current path turned back downwards by the flange or the moving contact seat through the insulating connector, an insulating air chamber surrounding the moving contact and the fixed contact is formed on the inner side of the switch induction coil 9114, the insulating distance is shortened by using the insulating air chamber, and the grounding current in the moving contact 9113 is unidirectionally guided to the outside of the coil through the outer periphery of the first metal housing 9111 to form a backflow path through the first metal housing. Thus, the induction coil can sense only the unidirectional ground current passing through the movable contact 9113 in the induction coil, and accurately detect the ground current.

In close proximity, as shown with reference to fig. 12, the discharge gap 912 of the present application may also be configured to include:

a second metal housing 9121 formed by upper and lower flanges, sleeves or power strip, which is hermetically connected to the gas-insulated casing at the top of the main transformer and is commonly grounded, and at least part of the area inside which is filled with SF6 to provide gas insulation for the central point of the transformer;

the upper part of the conductive rod 9122 is electrically connected with the top of the second metal shell in a sliding way through a mounting seat and is positioned in a gas-insulated tube shell filled with SF6 gas, and the bottom of the conductive rod 9123 is fixedly and electrically connected with a movable-side ball head;

the gap induction coil 9124 is disposed on the outer periphery of the conductive rod 9122 and located inside the second metal casing, and is connected to the ground through a ground return circuit path formed by a flange, a sleeve, a socket and a mounting seat and located on the outer periphery of the coil, so as to avoid the influence of reverse phase of return signals on the accuracy of the coil. The grounding current which is unidirectionally passed through the conductive rod 9122 and is discharged by bulb breakdown can be detected by electromagnetic induction of the coil;

therefore, in the discharge gap 912, the static-side bulb 9125, which is matched with the dynamic-side bulb to realize gap discharge, can be only fixedly arranged in the gas-insulated tube shell at the top of the main transformer and is electrically connected with the neutral point of the transformer, so that the gap distance between the two bulbs can be changed through the movement of the dynamic-side bulb, and when the gap distance between the two bulbs reaches the breakdown distance in the SF6 gas environment, the SF6 gas medium is broken down, and the two bulbs are discharged and pass through the grounding current;

The dynamic ball 9123 needs to be disposed in the second metal housing and is kept above the static ball 9125, and the space between the dynamic ball 9123 and the static ball 9125 can be filled with insulating gas by sealing the second metal housing or by sealing an insulating shielding structure inside the housing;

when the conductive rod 9122 slides to the top position of the second metal housing, insulation is maintained between the dynamic ball 9123 and the static ball 9125;

when the conductive rod slides to the bottom of the second metal casing, the electric gap between the dynamic ball 9123 and the static ball 9125 breaks through to discharge.

Referring to fig. 6 to 10, the oil storage cabinet can be further arranged in the following manner to save materials required by the switch oil storage cabinet, ensure that the internal structure of the main oil storage cabinet is regular, and facilitate sealing of capsules. For making things convenient for the operator to maintain the oil storage cabinet, this application still can further extend the breathing passageway of main oil storage cabinet, evacuation passageway and the switch cabinet breathing passageway of switch oil storage cabinet to its lateral wall lower part along the transformer main part outside, guarantees that terminal each respirator of passageway and valve structure are in the high position that is close maintainer. From this, this application can separate independent design with transformer oil storage cabinet and switch oil storage cabinet, makes things convenient for maintainer operation and compresses the shared volume of oil storage cabinet, with transformer integration to accord with the installation space requirement:

The main oil tank 1 is in a flat polygonal column structure, an inflatable capsule 10 is suspended at the top of the main oil tank through a hook structure shown in fig. 8, a hand hole can be further formed at the top of the main oil tank near the hook for convenient installation, sealing is realized through a hand hole cover plate with electrician laminated wood 33 shown in fig. 10, and air pockets are avoided through the electrician laminated wood on the back of the cover plate;

the switch oil storage cabinet 7 is arranged on one side end surface of the main oil storage cabinet 1 and is independent of the main oil storage cabinet 1;

the main gas pipe is arranged in an installation gap between the main oil storage cabinet 1 and the main transformer 9, one end of the main gas pipe is connected with the bottom of the main oil storage cabinet 1, the other end of the main gas pipe is connected with the main transformer 9, and the main gas pipe is provided with a gradient which is not smaller than 2 degrees upwards by the inclination of the main transformer main body box cover 9, so that gas escaping upwards from the oil tank is easy to accumulate in the gas relay through the main gas pipe;

the capsule lifting seat 2 is arranged at the top end of the main oil storage cabinet 1, is fixedly connected with the top of the capsule 10, and forms a gas accommodating cavity in a sealing manner between the top of the capsule and the top end of the capsule lifting seat 2;

a respiration channel which communicates with the inside of the capsule 10 through the capsule lifting seat 2 and extends from the capsule lifting seat 2 to the lower part of the side wall of the main transformer 9 to adjust the respiration state of the capsule 10;

And a vacuumizing channel communicated with the gas accommodating cavity, and extending from the top of the capsule lifting seat 2 to the lower part of the side wall of the main transformer 9, wherein the vacuumizing channel is used for adjusting the air pressure in the gas accommodating cavity.

The capsule lifting seat 2 at the middle position of the top of the oil tank structure can be further provided in the manner of fig. 7 to comprise:

the lifting seat main body is connected with the top end of the main oil storage cabinet 1 and is provided with an opening at the top;

a capsule lifting seat cover plate 22 which is connected with the lifting seat main body in a sealing way and seals the opening;

the capsule connecting flange 20, the top of which is in sealing connection with the capsule lifting seat cover plate 22, is provided with the bottom of which is in sealing connection with the top of the capsule 10, and is provided with a flange channel inside which communicates with the inside of the capsule 10.

Thus, the bottom of the respirator tube joint 21 can be connected with the capsule lifting seat cover plate 22 into a whole, and the top is connected with the breathing channel; the main oil storage cabinet air release plug 23 can be arranged on the capsule lifting seat cover plate 22 and is communicated with the vacuumizing channel and the gas accommodating cavity; and between the capsule rising seat cover plate 22 and the capsule connecting flange 20, a first sealing ring 201 and a second sealing ring 202 are respectively arranged between the capsule rising seat cover plate 22 and the rising seat main body, and the sealing property of the capsule during respiration is enhanced by surrounding the second sealing ring 202 with a double-layer sealing structure formed outside the first sealing ring 201, so that the gas entering the oil storage cabinet is not easy to accumulate at the capsule rising seat due to loose sealing.

The switch oil storage cabinet which is independently arranged on the outer side of the main oil storage cabinet can be connected with the switch cabinet breathing channel which is independent of the main oil storage cabinet 1 through the structure shown in fig. 9, and the switch oil storage cabinet air release plug 71 is connected with the switch oil storage cabinet which is independently arranged through the cylinder structure, so that the consumption of oil tank materials is reduced, the volume space occupied by the switch oil storage cabinet is reduced, the position of the switch oil storage cabinet is moved according to the position of the on-load switch head cover, and the overhaul and maintenance of the on-load switch are facilitated. In fig. 6, the connection mode of the switch oil storage cabinet on the end cover plate by direct welding can also strengthen the structural strength of the end cover plate of the main oil storage cabinet.

The corresponding switchgear breathing passages in the present application may be specifically configured to include those shown in fig. 9:

a breather connecting pipe 72 extending from the bottom of the switch oil tank 7 up to the inner top end of the switch oil tank 7;

the switch oil storage cabinet breather 8 is connected with the tail end of the breather connecting pipe 72, and is arranged outside the lower part of the main transformer 9 together with the breather and the valve of the main transformer, so that the maintenance of operators is facilitated;

the switch oil storage cabinet air release plug 71 can be directly arranged at the top end of the switch oil storage cabinet 7 and positioned above the breather connecting pipe 72, so that air can be conveniently exhausted;

And the breathing channel of the switch cabinet is connected with the breathing channel and the vacuumizing channel which are connected with the main oil storage cabinet through the pressure balance valve which is horizontally arranged, so that the synchronous vacuumizing is realized, and the load switch and the transformer main body which are connected with the switch oil storage cabinet 7 are kept in a pressure balance state in the vacuumizing process.

In addition, the utility model discloses an inside of opening the all-in-one that becomes, sleeve pipe and the wire between main transformer and the GIS equipment all adopt GIL hard tube insulating mode to realize, and accessible GIL shell pipeline reliable ground can not receive natural environment's influence completely, for making daily electrified inspection and maintenance provide the safety guarantee, and it is convenient.

The trend of the GIS equipment pipeline adopted by the method can be set to be matched with the appearance of the main transformer, the appearance of the main transformer and the trend of the GIS pipeline are designed and planned through the integrity, so that the main appearance of the transformer substation is more compactly and reasonably arranged, occupied geographic space is reduced, land area is saved, civil construction engineering quantity is correspondingly reduced, actual construction cost can be reduced, the problem that land resources are scarce when some transformer substations are constructed at present is solved, and the development trend of a resource-saving society for sustainable development of current construction is met.

The integrated design of the main transformer and the GIS equipment, the integrated design of the connection interface of the main transformer and the GIS equipment, the connection of the internal central conductor and the external pipeline are all provided with the displacement compensation device, and the factory prefabricated production ensures that the connection of the main transformer and the GIS equipment is simpler, the site modular installation is realized, the installation process can be simplified, and the overall appearance arrangement of the opening and transformation integrated machine is more compact, reasonable and reliable.

To sum up, the present application provides a method for manufacturing a device by combining two kinds of primary devices: the main transformer and the GIS are integrated into a whole, the appearance of the main transformer and the trend of GIS equipment pipelines are integrally designed and planned, the main transformer high voltage and the GIS equipment are directly connected through a closed gas insulated bushing (GIL pipeline) hard pipeline, the GIS equipment and the main transformer are more coordinated and matched through the optimization measures, the overall appearance arrangement of the main transformer is more compact and reasonable, the requirement of external electrical insulation distance during electrified operation is not needed to be considered, and the daily installation, inspection and maintenance are more convenient. Therefore, the switching all-in-one machine is higher in total integration degree, can be flexibly and reliably connected into a power grid, and can be used for compactly installing the main transformer and GIS equipment in an arrangement field in a mode shown in fig. 4. When the main transformer high voltage and the GIS equipment are directly connected in a closed mode, each phase only needs to lead out one oil-SF 6 sleeve pipe from the main transformer high voltage lifting seat, and the sleeve pipe is not needed to be led out from the connection outgoing line position of the main transformer interval and the main transformer of the GIS equipment. In the traditional soft overhead line connection mode, an oil-air sleeve is required to be installed on each phase of a high-voltage lifting seat of the main transformer, and an SF 6-air sleeve is required to be installed on each phase of a connection outlet of a GIS equipment main transformer interval and the main transformer. Compared with the traditional soft overhead line connection mode, the direct closed connection mode of the main transformers and the GIS equipment enables the three-phase sleeve number of each main transformer to be changed from 6 to 3 when the main transformers of the GIS equipment are connected at intervals, the total sleeve number and cost can be saved, and particularly, when the number of the main transformers of the transformer substation is more, better economic benefits are compared with the traditional technology, the novel technology has the following advantages:

Main transformer and GIS equipment integrated design, mill's prefabricated formula production, on-the-spot modularization installation, the overall appearance is arranged compactly rationally. In this application, all sleeve pipes and binding post, the lead-out wire that set up between main transformer and GIS equipment all set up outside insulation when electrified operation or through GIL shell pipeline reliable ground, the connection form of full insulation can not receive natural climate environment's influence completely, very big increase the factor of safety when transformer substation's operation, can satisfy the demand to the customer that safe reliability requires extremely high, need not to consider the outside electrical insulation distance requirement when electrified operation, daily electrified inspection and maintenance are safer convenient and fast.

According to the method, a series of optimization is carried out on the internal design and the internal air distance of the main transformer oil tank, the appearance and the installation position of the oil storage cabinet and the cooler are optimized, the appearance size of the large-capacity main transformer is greatly reduced, the trend of GIS equipment pipelines is optimized, the length space of GIS equipment can be further compressed, the appearance of the main transformer and the trend of the GIS equipment pipelines can be designed and planned integrally when the main transformer and the GIS equipment are integrally designed and arranged, the GIS equipment and the main transformer are more in coordination and matched through the optimization measures, the overall appearance arrangement is more compact and reasonable, the overall appearance size after the two are integrated meets the project requirement of intensive installation of the open-side integrated machine by using a long-side short rectangular field, and the occupied space of the high-voltage outdoor transformer substation is greatly reduced.

The foregoing is merely exemplary of embodiments of the present application and is thus not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application.

Claims

1. The utility model provides a change all-in-one, which characterized in that includes:

the main transformer (9) comprises a main structure and high-pressure oil-SF 6 bushings (93), each high-pressure oil-SF 6 bushing (93) is respectively connected with one phase in a high-pressure outlet of the main transformer, each phase of high-pressure oil-SF 6 bushing (93) is horizontally arranged at the top of one side of the main structure along the length direction of the main structure, and the height of each high-pressure oil-SF 6 bushing (93) is lower than that of the main structure of the main transformer (9);

one end of the gas insulating sleeve (94) is fixedly connected with the high-pressure oil-SF 6 sleeve (93), and the other end of the gas insulating sleeve is fixedly connected with GIS equipment;

the GIS equipment comprises a plurality of groups of installation underframes (959) which are horizontally arranged on one side of a high-pressure oil-SF 6 sleeve (93) in parallel with the length direction of the main transformer (9) and electric elements which are arranged on the installation underframes (959), wherein the installation underframes (959) of each group are sequentially arranged in parallel along the length direction of the high-pressure oil-SF 6 sleeve (93), and the electric elements arranged on the installation underframes (959) of each group are sequentially connected with the high-pressure oil-SF 6 sleeve (93) in series by a steering structure;

The oil storage cabinet is internally provided with insulating oil, is fixedly arranged at the top of a main body structure of the main transformer (9), and is provided with a main gas pipe arranged between the oil storage cabinet and an installation gap of the main transformer (9) and a pressure adjusting channel communicated with the interior of the oil storage cabinet, wherein the pressure adjusting channel horizontally extends to the edge of the side wall of the main transformer (9) from the top of the oil storage cabinet and then bends and extends downwards to the lower part of the side wall of the main transformer (9);

and the air cooler (92) is arranged on the end face of the other side of the main body structure of the main transformer (9), and insulating oil of the coil is directly introduced into the air cooler (92) through an oil guide pipe of the main transformer so as to reduce the temperature of the insulating oil in the main transformer (9).

2. The all-in-one switch as claimed in claim 1, wherein each group of mounting underframe is provided with electric elements which are respectively matched with three phases of the main transformer (9) side by side;

the steering structure includes:

the three-phase converging sleeve body (9511) is parallel to the main transformer (9) and the mounting underframe (959) and is arranged between the main transformer and the mounting underframe, three sleeve connecting ports are arranged at the top of the three-phase converging sleeve body (9511), each sleeve connecting port is electrically connected with a corresponding phase high-pressure oil-SF 6 sleeve (93) through a phase gas insulating sleeve (94), conductors which are respectively matched with the three sleeve connecting ports are arranged in the three-phase converging sleeve body (9511) in parallel, the conductors are fixedly connected through insulating connectors, and each conductor is electrically connected with a phase high-pressure oil-SF 6 sleeve (93);

The steering sleeve is characterized in that a first end of the steering sleeve is connected with one side of a three-phase converging sleeve body (9511), three groups of 90-degree steering conductors which are parallel to each other are arranged in the steering sleeve at intervals, and each 90-degree steering conductor is electrically connected with one phase of electric conductor in the three-phase converging sleeve body (9511);

a three-phase separation sleeve body (9512) parallel to the high-pressure oil-SF 6 sleeve (93) and connected to the second end of the steering sleeve, wherein the three-phase separation sleeve body (9512) is provided with three element connection ports at the side part of the installation underframe (9512), each element connection port is electrically connected with one phase of electric element on the installation underframe (959), the three-phase separation sleeve body (9512) is internally provided with inner conductors which are respectively matched with the three-phase element connection ports in parallel, the inner conductors are fixedly connected by an insulating connecting piece, and each inner conductor is respectively electrically connected with one phase of steering conductor;

and an inter-group telescopic connecting sleeve (9513) connected between three-phase separating sleeve bodies (9512) arranged on the side parts of two adjacent mounting underframes (959), wherein each phase of inner conductors in the three-phase separating sleeve bodies (9512) are respectively connected in series.

3. The switching all-in-one machine according to claim 1, wherein the main transformer (9) is internally provided with: three-phase coils which are sequentially arranged along the length direction of the main transformer (9) main body structure;

The three-phase high-voltage outgoing lines are respectively connected with the three-phase coils, are respectively led out upwards to the top of the same side of the main transformer main body structure, are respectively and horizontally outwards bent and connected to a phase high-pressure oil-SF 6 sleeve (93) at the top of the main transformer, and are led out horizontally outwards from the high-pressure oil-SF 6 sleeve (93).

4. The switching all-in-one machine according to claim 2, wherein each phase of high-pressure oil-SF 6 bushing (93) is horizontally connected with a gas-insulated bushing (94) matched with the phase, and support bars supported on the outer side of the main transformer (9) box body are respectively arranged on the lower side of each phase of high-pressure oil-SF 6 bushing (93).

5. The all-in-one machine according to claim 2, wherein the neutral point of the main transformer (9) is grounded through a gas-insulated neutral point grounding device, and the low-voltage bushing of the main transformer (9) is a cable plug bushing.

6. The all-in-one switching machine of claim 5, wherein the gas-insulated neutral point grounding means comprises a parallel connection between a main transformer neutral point and ground level: a lightning arrester, a disconnector and/or a discharge gap.

7. The all-in-one switch as claimed in claim 6, wherein the isolation switch (911) includes: a first metal housing (9111) sealingly connected to the gas-insulated enclosure at the top of the main transformer and commonly grounded;

The static contact (9112) is arranged in the gas-insulated tube shell at the top of the main transformer and is electrically connected with the neutral point of the transformer;

the upper part of the moving contact (9113) is in sliding electric connection with the first metal shell (9111), the bottom end of the moving contact (9113) is in electric contact with the static contact when the moving contact (9113) slides to the bottom position of the first metal shell (9111), and the bottom end of the moving contact (9113) is separated from the static contact when the moving contact slides to the top position of the first metal shell (9111);

and the switch induction coil (9114) is arranged on the periphery of the moving contact (9113) and is positioned in the first metal shell (9111), and the moving contact penetrates through the switch induction coil (9114) so as to trigger the switch induction coil (9114) to induce the grounding current passing through the moving contact (9113).

8. The all-in-one switching machine of claim 7, wherein the discharge gap (912) comprises: a second metal housing (9121) sealingly connected to the gas-insulated enclosure at the top of the main transformer and commonly grounded;

the upper part of the conducting rod (9122) is in sliding electric connection with the top of the second metal shell, and the bottom of the conducting rod is fixedly and electrically connected with a movable side ball head (9123);

A gap induction coil (9124) disposed on the outer periphery of the conductive rod (9122) and inside the second metal case, the conductive rod (9122) penetrating the gap induction coil (9124) to trigger the gap induction coil (9124) to detect the current in the conductive rod (9122);

the static-side bulb (9125) is fixedly arranged in a gas-insulated tube shell at the top of the main transformer and is electrically connected with a neutral point of the transformer;

the movable side ball head (9123) is positioned in the second metal shell and above the static side ball head (9125), and insulating gas is filled between the movable side ball head (9123) and the static side ball head (9125);

when the conductive rod (9122) slides to the top position of the second metal shell, insulation is kept between the dynamic side bulb (9123) and the static side bulb (9125);

when the conducting rod slides to the bottom of the second metal shell, an insulation gas gap is broken down between the dynamic side bulb (9123) and the static side bulb (9125) to discharge.

9. The switch-in all-in-one machine of claim 1, wherein the oil reservoir comprises:

a main oil reservoir (1) provided in a flat polygonal column structure, inside which a capsule (10) is accommodated;

The switch oil storage cabinet (7) is arranged on one side end surface of the main oil storage cabinet (1) and is independent of the main oil storage cabinet (1);

the main air pipe is arranged in an installation gap between the main oil storage cabinet (1) and the main transformer (9), one end of the main air pipe is connected with the bottom of the main oil storage cabinet (1), the other end of the main air pipe is connected with the main transformer (9), and the main air pipe has a gradient of not less than 2 degrees from the inclination upward of the main transformer main body box cover (9);

the capsule lifting seat (2) is arranged at the top end of the main oil storage cabinet (1), is fixedly connected with the top of the capsule (10), and forms a gas accommodating cavity in a sealing manner between the top of the capsule and the top end of the capsule lifting seat (2);

the breathing channel is communicated with the inside of the capsule (10) through the capsule lifting seat (2), and extends to the lower part of the side wall of the main transformer (9) from the capsule lifting seat (2) to adjust the breathing state of the capsule (10);

and the vacuumizing channel is communicated with the gas accommodating cavity, extends to the lower part of the side wall of the main transformer (9) from the top of the capsule lifting seat (2) and is used for adjusting the air pressure in the gas accommodating cavity.

10. The switch-in all-in-one machine according to claim 9, wherein said capsule-raising seat (2) 959 comprises: the lifting seat main body is connected with the top end of the main oil storage cabinet (1) and is provided with an opening at the top;

A capsule lifting seat cover plate (22) which is connected with the lifting seat main body in a sealing way and seals the opening;

the top of the capsule connecting flange (20) is in sealing connection with the capsule lifting seat cover plate (22), the bottom of the capsule connecting flange is in sealing connection with the top of the capsule (10), and a flange channel is arranged in the capsule connecting flange and communicated with the inside of the capsule (10);

the bottom of the respirator pipe joint (21) is connected with the capsule lifting seat cover plate (22) into a whole, and the top of the respirator pipe joint is connected with the breathing channel;

the main oil storage cabinet air release plug (23) is arranged on the capsule lifting seat cover plate (22) and is communicated with the vacuumizing channel and the gas accommodating cavity;

wherein a first sealing ring (201) is arranged between the capsule lifting seat cover plate (22) and the capsule connecting flange (20);

a second sealing ring (202) is arranged between the capsule lifting seat cover plate (22) and the lifting seat main body;

the second sealing ring (202) is arranged outside the first sealing ring (201) in a surrounding mode.