CN216849570U - Transformer oil tank - Google Patents

Abstract

The application provides a transformer tank. The transformer oil tank comprises an upper oil tank, a lower oil tank, a high-pressure oil-SF 6 sleeve horizontally arranged on the side part of a main structure of the upper oil tank, and an air cooler arranged on the end face of one side of the upper oil tank. According to the application, on the premise of ensuring reliable and stable gas insulation, the high-pressure oil-SF 6 sleeve is arranged in a horizontal outgoing line mode to be directly connected with the GIS, so that the pipeline structure of the high-pressure outgoing line side of the transformer is simplified, and the arrangement mode of the GIS is optimized conveniently. The high-pressure oil-SF 6 sleeve wire outgoing mode provided by the transformer oil tank can compactly install the transformer and GIS equipment on a rectangular field, the area utilization rate of the field is improved, and the power transformation requirement of a large-capacity small field is met. The high-voltage outgoing line of the transformer adopts a full-insulation connection mode, so that the high-voltage outgoing line is completely free from the influence of severe natural climate environments and external animals, has a high safety factor, and can meet the requirement of customers on safe and reliable performance.

Description

Transformer oil tank

Technical Field

The application relates to the technical field of power transformers, in particular to a transformer oil tank.

Background

The existing transformer oil tank has the following problems:

in a traditional 220kV and 50MVA power transformer, an oil tank generally adopts a bell-type up-and-down connection structure. The box cover adopts a flat top or trapezoidal top structure. The high-voltage bushing is an oil-air bushing, the low-voltage bushing is a pure magnetic bushing, and the high-voltage bushing is arranged on an oil tank cover and led out from the top through a lifting seat. The high-voltage lead is led out and the rising seat is placed, and the fuel tank wall is designed in a bulge mode. The electrical connection mode has higher requirements on the insulation distance between devices, and is easily influenced by external environmental factors, so that the transformer is unstable in work and has maintenance problems.

In addition, for guaranteeing the mechanical strength of the oil tank, the reinforcing ribs of the existing transformer oil tank adopt U-shaped reinforcing ribs. The existing cooling mode of insulating oil in a transformer oil tank generally adopts an ONAN or ONAF mode, and the cooling mode is realized by a plurality of groups of finned radiators or by additionally hanging a plurality of fans on the plurality of groups of finned radiators. These structures require a large installation space and therefore affect the compactness of the overall substation equipment layout.

The oil conservator that current transformer adopted generally sets up to the circular oil conservator of easy processing. The existing circular oil conservator is generally arranged on the low-voltage side of the tank cover in parallel with the long shaft according to the requirement, and the electrical insulation distance between the existing circular oil conservator and the high-voltage and low-voltage sleeve pipes is ensured; or arranged parallel to the short shaft, and is supported by the bracket to be slightly far away from the oil tank body in order to ensure the insulation distance with the high-voltage bushing. Therefore, the conservator in the existing transformer also needs to occupy a large installation space.

The traditional transformer oil tank is designed by adopting national standards or power grid enterprise standards, and the appearance is not optimized, so that the occupied space is larger.

Disclosure of Invention

The utility model provides a transformer tank to prior art's not enough, this application is through the horizontal high-pressure oil-SF 6 sleeve pipe that sets up of level with the gas insulated bushing of transformer high pressure side with transformer and GIS equipment connection as an organic whole to make things convenient for both can be in order to compress transformer installation site area in the compact arrangement of mode side by side. The high-capacity and high-reliability variable-voltage output device can provide high-capacity and high-reliability variable-voltage output in a smaller space place. The technical scheme is specifically adopted in the application.

First, in order to achieve the above object, a transformer tank is provided, which includes: the upper oil-saving tank comprises a main body structure and high-pressure oil-SF 6 sleeves, each high-pressure oil-SF 6 sleeve is connected with one phase of a high-pressure outlet wire of the transformer, each phase of high-pressure oil-SF 6 sleeve is horizontally arranged at the top of one side of the main body structure along the length direction of the main body structure, and the height of each high-pressure oil-SF 6 sleeve is lower than that of the main body structure; the lower oil-saving tank is hermetically connected with the upper oil-saving tank and used for sealing the transformer and the insulating oil; and the air cooler is arranged on one side end face of the main structure of the upper oil saving tank, and insulating oil is directly introduced into the air cooler through an oil guide pipe of the transformer so as to reduce the temperature of the insulating oil in the transformer oil tank.

Optionally, the transformer oil tank as described in any of the above, wherein a top of the main structure of the upper oil tank is a flat-top tank cover, and the bottom of the upper oil tank is welded and sealed with the top of the lower oil tank.

Optionally, as above arbitrary transformer tank, wherein, the top of upper segment oil tank still is provided with stores up the oil tank, and it adopts flat octagonal structure, and inside storage has insulating oil, store up the oil tank and have the main trachea that sets up in the installation clearance between oil tank and major structure to and the inside pressure adjustment passageway of intercommunication oil tank, the pressure adjustment passageway is extended to the lateral wall lower part of upper segment oil tank by the lateral wall edge back bending downward of the top level extension upper segment oil tank of storing up the oil tank.

Optionally, the transformer tank as described in any of the above, wherein the conservator is horizontally installed on the flat top cover on the side close to the high pressure oil-SF 6 casing along the long axis direction of the upper section tank.

Optionally, as for the transformer oil tank described above, a groove-shaped oil tank body is formed in the middle of the lower oil-saving tank, a horizontal welding installation surface is formed on the periphery of the lower oil-saving tank, the horizontal welding installation surface is welded and fixed to the bottom of the upper oil-saving tank, a base connected to the periphery of the groove-shaped oil tank body is further disposed below the horizontal welding installation surface, and both the length and the width of the groove-shaped oil tank body are smaller than those of the main structure of the upper oil-saving tank.

Optionally, as in any above transformer tank, wherein, the upper segment oil tank communicates with the inside of the groove-shaped oil tank body, and is provided with: the three-phase coils are sequentially arranged along the length direction of the upper-section oil tank main body structure; and the three-phase high-voltage outgoing lines are respectively connected with the three-phase coils, are respectively upwards led out to the top of the same side of the upper oil tank, are respectively bent outwards horizontally at the top of the main body structure and are connected to a phase high-pressure oil-SF 6 sleeve, and are led out horizontally outwards by the high-pressure oil-SF 6 sleeve.

Optionally, in the transformer oil tank described in any of the above, each phase of high-pressure oil-SF 6 bushing is horizontally connected to a gas insulation bushing matched with the phase, and a support frame supported outside the transformer oil tank is disposed on a lower side of each phase of high-pressure oil-SF 6 bushing.

Optionally, as for the transformer oil tank, a mounting bottom plate is arranged at the bottom of the support frame, a crisscross slotted hole is formed in the mounting bottom plate, a countersunk screw is installed in the crisscross slotted hole, and the countersunk screw is fixedly connected with a stud welded to the side wall of the upper oil tank to fix the support frame.

Optionally, in the transformer oil tank as described in any of the above, the outer periphery of the upper oil tank is further provided with a plurality of flat reinforcing irons, and the upper and lower sides of each flat reinforcing iron are respectively provided with lug holes.

Advantageous effects

The transformer oil tank provided by the application comprises an upper oil-saving tank, a lower oil-saving tank, a high-pressure oil-SF 6 sleeve horizontally arranged on the side part of the main structure of the upper oil-saving tank, and an air cooler arranged on the end face of one side of the upper oil-saving tank. According to the application, on the premise of ensuring reliable and stable gas insulation, the high-pressure oil-SF 6 sleeve is arranged in a horizontal outgoing line mode to be directly connected with the GIS, so that the pipeline structure of the high-pressure outgoing line side of the transformer is simplified, and the arrangement mode of the GIS is optimized conveniently. The high-pressure oil-SF 6 sleeve outgoing mode provided by the transformer oil tank can compactly install the transformer and GIS equipment on a rectangular field, improves the field area utilization rate, and meets the power transformation requirements of a large-capacity small field. The high-voltage outgoing line of the transformer adopts a full-insulation connection mode, so that the high-voltage outgoing line is completely free from the influence of severe natural climate environments and external animals, has a high safety factor, and can meet the requirement of customers on safe and reliable performance.

Further, this application is through carrying out a series of optimizations to transformer tank internal design and interior empty distance, and the cooperation is to the optimization of oil conservator and cooler appearance and mounted position, has reduced large capacity transformer's overall dimension by a wide margin, and to the optimization of GIS equipment pipeline trend, will install the required length space adjustment of GIS for cooperating in transformer length dimension's cell structure to make both total overall dimensions satisfy the requirement of the outer limit size in rectangle installation place after the integration, satisfied the little place demand of large capacity. In particular, in order to avoid the bulge structure generated by reserving the insulation distance of the tube shell on the high-voltage outgoing line side of the transformer, and the installation distance between the transformer and the GIS equipment increased by the bulge structure and the high-voltage outgoing line side pipeline bending structure, the three-phase high-voltage outgoing line of the transformer is fixed by an upper clamp of the transformer and extends to the top of the same side of the main body structure of the transformer along the horizontal direction in the transformer, then the three-phase high-voltage outgoing line is respectively bent outwards horizontally on the top of the transformer and is directly connected to the corresponding high-voltage oil-SF 6 sleeve in the horizontal mode, so that the 90-degree steering to the high-voltage outgoing line side is directly completed in the main body structure of the transformer, and the top height of the high-voltage oil-SF 6 sleeve cannot exceed the top height of the transformer. The high-pressure oil-SF 6 sleeve structure horizontally arranged on one side of the top of the transformer can cancel a Z-shaped steering pipeline arranged on the outer side of the transformer in the traditional outgoing line mode, so that the required installation space of the transformer pipeline structure is reduced. This application can be directly upwards draw forth earlier three-phase high-voltage lead-out wire in the transformer to the same one side top of upper oil tank, then make it turn to stretch out with direct through gas insulation sleeve pipe along transformer width direction with three-phase line along the transformer horizontally and separate and turn to, make it directly match each looks electrical component on the installation chassis to the electric connection between transformer and the GIS equipment is realized to short pipeline arrangement distance. According to the transformer high-voltage lead-out wire winding device, the internal space 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-out wire is bent downwards and gathered by utilizing the space under the high-voltage oil-SF 6 sleeve structure on the long side of the transformer, 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 electrically connected with each phase of electrical element arranged on the GIS equipment installation underframe through the three-phase separating sleeve body arranged on the outer side of the end part of the installation underframe. Therefore, the height space and the width space required by wiring can be compressed, the distance of the long edge of the GIS equipment and the pipeline is limited to be consistent with the distance of the long edge of the transformer, and therefore the installation space of the outer side of the long edge of the transformer can be fully utilized, the high-voltage outgoing lines can be connected with the electric elements arranged on the installation underframe in series to output high-voltage signals.

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 the 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 embodiments of the application and together with the description serve to explain the principles of the application and not limit the application. In the drawings:

FIG. 1 is a schematic view of an integral connection structure between a transformer tank and substation equipment according to the present application;

FIG. 2 is a block diagram of a side view of a transformer tank according to the present application;

FIG. 3 is a schematic view of the internal high voltage lead-out wire of the transformer in the present application from a lateral perspective;

FIG. 4 is a schematic diagram of a transformer according to the present application from a top view;

FIG. 5 is a schematic structural diagram of a high-pressure side view of a transformer tank in the present application;

FIG. 6 is a schematic view of the structure of the conservator of the present application;

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

FIG. 8 is a schematic view of the capsule structure hanging in the conservator of FIG. 6;

FIG. 9 is a schematic view of the side switch conservator configuration of the conservator shown in FIG. 6;

FIG. 10 is a side view of the hand hole cover in the conservator of FIG. 6;

fig. 11 is a cross-sectional view of a disconnector employed in the transformer of the present application;

FIG. 12 is a cross-sectional view of a discharge gap employed in the transformer of the present application;

FIG. 13 is a side cross-sectional view of a wind cooler inlet tube arrangement of the transformer of the present application;

FIG. 14 is a transverse cross-sectional view of a wind cooler inlet tube arrangement of the transformer of the present application;

FIG. 15 is a graph comparing a natural oil circulation cooling pattern with a forced oil circulation cooling pattern 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 drawings, 1 denotes an oil conservator; 10 denotes a capsule; 12 denotes a hook; 2 denotes a capsule lifting seat; 20 denotes a capsule attachment flange; 21 denotes a respirator pipe joint; 22 denotes a capsule lifting seat cover plate; 23 denotes a tank vent 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 laminated wood; 4 denotes a gas relay; 41 denotes an oil tank end butterfly valve; 42 denotes a bellows; 43 denotes a case cover end butterfly valve; 44 denotes a tank lid connection elbow; 5 denotes a conservator breather; 6, a switch oil conservator respirator; 7 denotes a switch conservator; 70 denotes an oil level gauge; 701 denotes a rain cover; 71 denotes a switch conservator bleeder cock; 72 denotes a respirator connection tube; 8 denotes a valve; 9 denotes a transformer; 91 denotes a neutral point grounding device; 9111 denotes a first metal case; 9112 denotes a stationary contact; 9113 denotes a movable contact; 9114 denotes a switching induction coil; 9121 denotes a second metal housing; 9122 denotes a conductive rod; 9123 denotes a movable-side ball head; 9124 denotes a gap induction coil; 9125 denotes a dead-side ball head; 92 denotes a wind cooler; 921 represents an air cooler oil inlet pipe; 922, lower clip manifold; 923 represents a U-shaped oil guide pipe of the lower clamping piece; 93 denotes a high pressure oil-SF 6 casing; 931 denotes a supporting frame; 932 denotes a mounting baseplate; 94 denotes a gas-insulated bushing; 9511 denotes a three-phase confluence casing body; 9512 denotes a three-phase separation sleeve body; 9513 denotes inter-group telescopic joint pipes; 952 denotes a telescopic joint; 953 denotes a current transformer; 954 denotes a circuit breaker; 955 denotes a circuit breaker operating mechanism; 956 denotes a lightning arrester; 957 denotes a voltage transformer; 958 denotes a disconnector assembly; 9582 denotes a ground switch; 959 shows a mounting chassis; 96 denotes an upper oil tank; 961, a flat plate type reinforcing iron; 962 denotes a ear dragging hole; 97, a lower oil-saving tank; 971 denotes a tank body; 972 denotes a horizontal welding installation surface; 973 denotes a base foundation.

Detailed Description

In order to make the purpose and technical solutions of the embodiments of the present application clearer, 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 should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.

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 used herein is intended to include both the individual components or both.

The meaning of "inside and outside" in this application means that the direction from the outer shell of the oil conservator to the inside of the capsule is inside, and vice versa, the transformer itself is inside; and not as a specific limitation on the mechanism of the device of the present application.

The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.

The meaning of "up and down" in this application means that the direction from the ground towards the top of the capsule lifting seat is up, whereas down, when the user is facing the transformer, and is not a specific limitation of the device mechanism of the present application.

Fig. 1 and fig. 2 show a switchback machine according to the present application, which includes:

and the transformer 9 comprises a transformer oil tank, a three-phase coil arranged in the oil tank, and an air cooler and an oil conservator which are connected with the transformer oil tank. Wherein, the transformer oil tank is formed by combining an upper oil-saving tank 96 and a lower oil-saving tank. The upper oil saving tank comprises a main body structure and high-pressure oil-SF 6 sleeves 93, each high-pressure oil-SF 6 sleeve 93 is connected with one phase of a high-pressure outgoing line of the transformer respectively, each phase of high-pressure oil-SF 6 sleeves 93 are horizontally arranged at the top of one side of the main body structure respectively along the length direction of the main body structure, and the height of each high-pressure oil-SF 6 sleeve 93 is lower than that of the main body structure. The lower oil saving groove 97 is hermetically connected with the upper oil saving tank 96 to seal the transformer and the insulating oil;

the high-voltage outlet end of the transformer needs to be directly connected with GIS equipment through a gas insulated GIL pipeline, and a high-voltage oil-SF 6 sleeve connected with the GIL pipeline generally needs to be led out from one side of the transformer oil conservator. Consider that transformer major structure is the rectangle, its length dimension generally matches in the width dimension of installation site, consequently, this application is preferred to be arranged 9 laminating installation site narrow sides in place one side to utilize remaining complete rectangle space realization in the long limit direction of installation site to GIS equipment arrange and install. In order to match the arrangement mode, a high-voltage outgoing line can be arranged on the long side of the main structure of the transformer, so that the high-voltage outgoing line can be directly connected with GIS equipment arranged on the side part of the transformer outwards, the height of a high-voltage outgoing line end of the transformer is reduced, and the arrangement distance of GIL pipelines is shortened;

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

a gas insulation sleeve 94, which can be selected to adopt a closed GIL hard pipeline, 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 GIS equipment, generally, in order to be matched with the outlet structure of the high-pressure oil-SF 6 sleeve 93 of the transformer of the application, the gas insulation sleeve 94 can be arranged at the lower side of the outlet structure of the high-pressure oil-SF 6 sleeve 93, and is connected between the transformer and the GIS equipment by utilizing the lower space of the high-pressure oil-SF 6 sleeve 93;

the GIS device is arranged to comprise the following components shown in FIG. 16: GIL line 94, circuit breaker 954(CB), disconnecting ground switch assembly DES, quick ground switch (FES), voltage transformer 957(PT), current transformer 953(CT), surge arrester 956(LA), etc., which are organically combined by a plurality of sets of mounting chassis 959 and gas-insulated bushings connecting the various electrical components. The GIS equipment described above can be horizontally arranged on the side of the high pressure oil-SF 6 casing 93 parallel to the length direction of the main transformer 9 by means of several sets of mounting undercarriages 959. The electrical components on each group of mounting underframe 959 are connected in series by GIL hard tubes and arranged in parallel along the length direction of the high-pressure oil-SF 6 casing 93. And the electrical elements arranged in each group of mounting underframe 959 are sequentially connected in series with the high-pressure oil-SF 6 sleeve 93 through the steering structure. The electrical components arranged on each set of mounting chassis 959 do not have fixed arrangement requirements and can be arranged in any manner as long as GIS device functions can be achieved. Under some implementations, in order to compress the space, the application can arrange the circuit breaker horizontally to move towards and the installation place phase-match with the GIS pipeline on the installation chassis 959. For example, GIS equipment can set up the trend of its pipeline and main transformer and the outer limit size phase-match in installation place, with main transformer integrated design, prefabricated formula production of mill and modularization installation, overall appearance arranges compacter reasonable. When the inner central conductor of the GIS equipment is directly connected with a high-pressure oil-SF 6 sleeve of a 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 on the surface of the conductors at the joint. Displacement adjusting devices are arranged at the external pipeline connection positions in the corresponding directions of the 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 specifically realized by the structure shown in fig. 16: firstly, a high-voltage 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 box of the gas insulation sleeve 94 is utilized to convert a transformer high-voltage signal into a horizontal direction through a gas-insulated three-phase converging sleeve body 94 and lead the signal out to the front side of the oil tank to a GIS circuit. The top 90-degree turning position of the three-phase converging casing 9511 can be connected with a horizontally arranged sealed corrugated pipe shell to be used as a displacement adjusting device to realize the adjustment of horizontal displacement, the tail end of the horizontally arranged displacement adjusting device is connected with an isolating switch assembly 958, and the tail end of the isolating switch assembly 958 is further connected with another sealed corrugated pipe shell in a vertical mode to be used as a vertical displacement adjusting device, so that a high-voltage signal output by the transformer main body is transmitted to a horizontal circuit breaker operating mechanism 955 to control the on-off of the high-voltage signal. The circuit breaker actuator 955 is horizontally fixed at the bottom of the installation chassis 959, the space above the circuit breaker actuator 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, the tail end of the grounding switch is horizontally led out backwards and connected with another horizontally arranged three-phase converging sleeve body 9511, and the three-phase converging sleeve body 9511 is connected with a three-phase separating sleeve body 9512 at the side part of the next installation chassis, so that reliable electric connection of electric elements on different chassis is realized. On the next chassis, a breaker 954, a disconnector assembly 958, a telescopic joint 952, etc. may be correspondingly disposed, and finally, an overcurrent protection may be achieved through the disconnector assembly 958, the voltage transformer 957, the lightning arrester 956, etc. vertically disposed at the bottom of the gas insulated bushing 94 at the end of the chassis. From this, the direction of the pipeline of the whole GIS equipment can be matched with the outer limit size of main transformer and installation site, and the installation and transportation are convenient.

Generally, in order to further ensure that the transformer and the GIS equipment are reliably connected and cannot be damaged due to displacement deviation in the transportation process, a displacement adjusting device realized by a telescopic corrugated pipe shell can be generally placed between the connection part of the transformer and the GIS equipment so as to provide longitudinal or transverse deviation and steering space.

According to the transformer oil tank, the top of the main structure of the upper oil-saving tank 96 adopts a flat-top tank cover, and the bottom of the upper oil-saving tank 96 is welded and sealed with the top of the lower oil-saving tank 97. Therefore, the oil conservator can be conveniently installed at the flat top of the upper oil tank. The oil conservator can adopt a flat octagonal structure shell, and insulating oil is stored in the oil conservator. Which further reduces the height of the transformer body structure by arranging the housing having a flat octagonal sectional shape with insulating oil stored inside, the top of which is sealed by a capsule, laterally on the transformer, and the conservator horizontally mounted on the top of the flat top cap on the side close to the high pressure oil-SF 6 bushing 93 in the direction of the long axis of the upper-section oil tank 96 by means of a fixed mounting. A main air guide pipe can be arranged between the oil conservator and the installation gap of the transformer 9, and a pressure adjusting channel communicated with the inside of the oil conservator can be matched with an outer box of the transformer, horizontally extends from the top of the oil conservator to the edge of the side wall of the transformer 9 and then bends and extends downwards to the lower part of the side wall of the transformer 9;

and an air cooler 92 provided at the other side end face of the main body structure of the transformer 9 for reducing the temperature of the insulating oil in the transformer 9, the upper connection pipe of which is led out horizontally to reduce the height space. The air cooler 92 of the present application eliminates the manifold commonly used for external connection of the cooler to reduce the width space, the external manifold is replaced by a lower clip manifold pipe 922 at the lower clip inside the oil tank in the manner shown in fig. 13 and 14, and the lower clip manifold pipe is connected to the air cooler oil inlet pipe 921 from the bottom of the oil tank, and does not occupy the whole space. In the mode shown in the lower side of fig. 5, the middle of the lower oil-saving tank 97 at the bottom of the oil tank is arranged to be concave, a tank-shaped oil tank body 971 is formed, the periphery of the lower oil-saving tank 97 forms a horizontal welding installation surface 972, the lower oil-saving tank and the bottom of the upper oil tank 96 are welded and fixed by the horizontal welding installation surface 972, and a base 973 connected with the periphery of the tank-shaped oil tank body 971 is arranged below the horizontal welding installation surface 972 to provide support. The length and width of the groove-shaped oil tank body 971 are both smaller than those of the main structure of the upper oil tank 96. The lower clip oil trap pipe 922 and the air cooler oil inlet pipe 921 may be provided at one side of the tank body 971 to utilize a space below the horizontal welding installation surface 972.

In addition, the lower oil-saving groove 97 may further have ground plates welded symmetrically around the bottom thereof. The lower oil tank can further arrange the foundation base into symmetrically welded and fixed jack bases along the periphery of the bottom plate, the jack bases are circular plate-shaped and welded at the supporting positions of the upper reinforcing ribs to enhance the mechanical strength.

A plurality of thermometer seats are welded at two ends of the tank cover so that a user can conveniently measure the oil temperature on two sides of the oil tank by using the thermometers.

Compared with the conventional cooling mode of suspending the plate radiator on the tank wall as shown on the left side of fig. 15, the conventional cooling mode needs to occupy a larger width space or needs to be led out in a split manner to occupy a larger length space, and cannot meet the requirement of the high-voltage power transformation vehicle on the limitation of the transportation size. This application cancels the radiator with figure 15 right side mode and leads oil pipe 923 through the inside lower folder department U type of oil tank and will descend the folder to gather the insulating oil direct introduction air cooler 92 in the oil pipe after cooling down, and the outside usable space of oil tank is more spacious in this application, is favorable to the installation of outside subassembly.

From this, transformer through above-mentioned mode realization, its transformer is adjustable suitable copper iron proportion and ware body size when calculating the electromagnetism scheme, close control oil tank empty size and GIS hard tube connection structure in the time of cooperation structural arrangement, GIS optimizes the pipeline trend, can guarantee that the total overall dimension control after transformer and the GIS erection joint that this scheme provided is in rectangle installation site within range, the inside space compact layout of the whole installation site of clearance make full use of between equipment that can be less, installation substation equipment, realize the large capacity with less installation space, high reliability transformation output.

Referring specifically to fig. 2 and 3, in order to reduce the total width of the tank and shorten the internal space between the high-voltage side of the coil and the tank wall, the present application may include: three-phase coil, and the three-phase high voltage lead-out wire that matches with three-phase coil. The three-phase coils can be sequentially arranged along the length direction of the main body structure of the transformer 9; and the three-phase high-voltage leading-out wires are respectively connected with three-phase coils, are respectively led out upwards to the top of the same side of the upper oil tank, are respectively bent outwards horizontally at the top of the transformer and are connected to a phase high-pressure oil-SF 6 sleeve 93, and are led out horizontally by the high-pressure oil-SF 6 sleeve 93, so that the high-pressure oil-SF 6 sleeves 93 and the fixed connecting end of the transformer are connected outwards horizontally. Therefore, the transformer can shorten the internal space distance between the high-voltage side of the coil in the transformer and the width direction of the oil tank wall, the high-voltage lead is led out at the phase, the three-phase lead of the high-voltage lead is led to the side wall of the oil tank together in a matching manner, and then the three-phase lead is directly led out to the wiring terminal of the high-voltage oil-SF 6 sleeve pipe in the main structure of the transformer in a horizontal direction by bending 90 degrees outwards, so that the internal electric distance can be ensured, and the stable operation of the transformer can be further ensured by matching with the arrangement position of the high-voltage oil-SF 6 sleeve pipe.

In the present application, compared to the vertical wire-out mode shown in the left side of fig. 3, the high-pressure oil-SF 6 bushing 93 can avoid the bulge structure marked by the virtual coil formed at the bottom of the high-pressure oil-SF 6 bushing 93 for ensuring the insulation distance inside the device in the vertical wire-out mode. Under the scheme that the high-pressure oil-SF 6 sleeves 93 are led out horizontally and outwards from the top of the connecting platform, the high-pressure outgoing line of the transformer can be directly bent in the transformer main body structure box body, so that the pipeline butt joint is realized in the direction directly matched with the GIL pipeline, and the steering matching structure between equipment is simplified. The lower side of the high-pressure oil-SF 6 casing 93 which horizontally extends out can be provided with a support 931 which is connected with the outside of the transformer box, and the obliquely arranged support 931 structure provides auxiliary support to ensure the stability of the connection part between the devices. Mounting plate 932 is connected to the bottom accessible of support frame 931 the mode shown on the left of figure 5, set up the cross slotted hole on mounting plate 932, install countersunk screw in the cross slotted hole, countersunk screw and the double-screw bolt fixed connection who welds in upper segment oil tank 96 lateral wall are fixed the support bar.

Therefore, the transformer can directly connect the high-voltage outgoing line of the transformer with the GIS equipment through the GIL pipeline and integrate the high-voltage outgoing line of the transformer with the GIS equipment, so that the transformer and the GIS equipment are organically combined into a whole. Through the optimized layout of transformer internal circuit, outside box structure cooperation high pressure side lead out three-phase oil-SF 6 sleeve pipe, the oil-SF 6 sleeve pipe that neutral point side was drawn out, the sleeve pipe of cable plug hair style that the low pressure side was drawn out, and match in the special short octagon or long circular oil conservator of transformer box, and parts such as cooler that the side was arranged, the GIS equipment of this application, transformer and the GIL pipeline of connecting both can cooperate the size of installation place to arrange to reduce cost of transportation and to the requirement of installation place.

In order to move the transformer oil tank structure during installation, a plurality of flat plate type reinforcing irons 961 are further arranged on the periphery of the upper oil tank 96, and lug pulling holes 962 are respectively formed in the upper side and the lower side of each flat plate type reinforcing iron 961.

In other implementation manners, the transformer can also utilize a plurality of groups of mounting chassis to horizontally arrange various electrical elements required by the GIS equipment on each group of mounting chassis according to the mounting size requirement, and then the transformer main body and each group of electrical elements are connected in a manner of fig. 2 or fig. 4 through the GIL pipeline with the steering structure, so that a complete transformer is formed. Wherein, each group of the installation underframe is provided with electric elements which are respectively matched with three phases of the transformer 9 in parallel; the steering structure connected between the transformer and each set of GIS equipment comprises:

the three-phase confluence bushing body 9511, which is parallel to the transformer 9 and the mounting chassis 959, is installed between them by using a space under the bushing 93 of high pressure oil-SF 6. The top of the three-phase converging casing body 9511 is provided with three casing connection ports, each casing connection port is electrically connected with a high-voltage oil-SF 6 casing 93 of a corresponding phase through a phase gas insulation casing 94, conductors respectively matched with the three casing connection ports are arranged in parallel inside the three-phase converging casing body 9511, the conductors are fixedly connected through insulation connecting pieces, and each conductor is electrically connected with a phase high-voltage oil-SF 6 casing 93;

the steering sleeve connects the first end of the sleeve with one side of the three-phase converging sleeve body 9511 and is in butt joint with each phase of electric 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 of electric conductor in the three-phase converging sleeve body 9511;

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

and the inter-group telescopic connecting sleeves 9513 are connected between three-phase separating sleeve bodies 9512 arranged at the side parts of the two adjacent mounting underframe 959 and are respectively connected with the inner conductors of each phase in the three-phase separating sleeve bodies 9512 in series.

Therefore, a high-voltage signal output by the high-pressure oil-SF 6 bushing 93 is transmitted to one side of the mounting base frame 959 along the length direction of the transformer body through the three-phase converging bushing body 9511, then is turned to the connecting direction of the electrical elements on the mounting base frame 959 through the turning bushing, and is respectively butted with the electrical elements of each phase through the three-phase separating bushing body 9512, so that the regulation and control of the high-voltage output signal are realized. The second set of mounting chassis 959 also provides electrical connections to the electrical components within the upper set of mounting chassis 959 through the three-phase split sleeve 9512 so that high voltage signals are transmitted and controlled in a zig-zag fashion between the electrical components provided by each set of mounting chassis 959.

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

1. an SF 6-air sleeve which is led out at intervals from a main transformer of the original GIS equipment and is connected with a high-voltage outgoing line of a transformer is eliminated.

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

3. The connecting interface of the transformer and the GIS equipment is designed integrally, displacement adjusting and compensating devices are designed on the connecting structure of the central conductor and the external pipeline in the GIL, and corrugated pipes are arranged on the external pipeline at the position where the shell of the external pipeline of the GIS equipment is directly connected with the high-pressure oil-SF 6 sleeve of the transformer in the height direction and the horizontal direction respectively to serve as the displacement adjusting devices, so that the connecting position can be adjusted on the site conveniently, and the installation and the connection of the transformer and the GIS equipment are safer and more reliable.

4. When the transformer and the GIS equipment are integrally designed and arranged, the GIS equipment and the transformer are more coordinately matched by integrally designing and planning the trend of a GIS equipment pipeline, the overall appearance arrangement is more compact and reasonable, and the inspection and maintenance are more convenient.

Therefore, the obtained GIS equipment can be matched with a transformer with the following improved wire outgoing mode to realize the compression of the whole assembly space of the transformer:

1. the low-voltage side wire outlet connection mode is changed from the connection of a conventional pure magnetic sleeve and a cable into the mode of leading out the cable through a cable plug type sleeve.

2. The outlet connection mode of the high-voltage side is changed from the conventional overhead line leading-out to be sealed in the GIL pipeline.

3. The connection mode of the outgoing line at the neutral point side is changed from the conventional overhead line leading-out into the mode of being closed in a pipeline of a neutral point grounding device, the original open-type connected neutral point grounding device is changed into the mode of being closed in the neutral point grounding device shown in the figure 11 and/or 12, the closed neutral point grounding device is directly installed on a neutral point lifting seat of a transformer horizontally led out from the upper part of the box wall at the switch side, an oil-SF 6 sleeve which is horizontally installed serves as a neutral point sleeve, the closed neutral point grounding device is directly installed on the neutral point lifting seat, an inner center conductor of the closed neutral point grounding device is directly connected with a neutral point oil-SF 6 sleeve, and the closed neutral point grounding device and the transformer are integrated to efficiently save length space.

Specifically, the gas-insulated neutral grounding device in which the transformer neutral is connected may include: 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 case 9111, which realizes a discharge path closely and commonly grounded with a gas-insulated tube at the top of the transformer through flange structures at both ends of the top and bottom and a metal cylinder or a conductive socket electrically connected between the two flange structures;

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

the upper part of the moving contact 9113 is in sliding electrical connection with the first metal shell 9111 through a moving contact base made of a conductive material, the bottom end of the moving contact 9111 is in electrical contact with the fixed contact when the moving contact 9111 slides to the bottom of the first metal shell 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 of the first metal shell 9111, so that a grounding current path is formed in the moving contact;

switch induction coil 9114, it sets up in the periphery of moving contact 9113 and is located the inside of first metal casing 9111, the moving contact is passed in switch induction coil 9114 center department, the inboard fixed knot of switch induction coil 9114 constructs the accessible insulated connecting piece and blocks the current path of turning back downwards by flange or moving contact seat and forms the insulating air chamber that surrounds the moving, the static contact at switch induction coil 9114 inboard, utilize insulating air chamber to shorten insulation distance, and form the backward flow route through first metal casing 9111 periphery with the one-way guide of grounding current in the moving contact 9113 to the coil outside. Therefore, the induction coil can only induce the one-way grounding current passing through the internal moving contact 9113, and can accurately detect the grounding current.

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

a second metal shell 9121 formed by upper and lower flanges, sleeves or socket bars, which is hermetically connected with the gas-insulated tube shell at the top of the transformer and is commonly grounded, and at least part of the inner area of the second metal shell is filled with SF6 to provide gas insulation for the central point of the transformer;

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

gap induction coil 9124, its setting is in conducting rod 9122's periphery and is located the inside of second metal casing, and it passes through flange, sleeve, inserts the ground connection backward flow electric path drainage ground connection backward flow that is located the coil periphery that row and mount pad constitute, avoids backward flow signal anti-phase to pass through the inside influence coil degree of accuracy of coil. The grounding current which is discharged through breakdown of the ball head and passes through the conducting rod 9122 in a single direction can be detected through the electromagnetic induction of the coil;

therefore, in the discharge gap 912, the static-side ball head 9125 which is matched with the moving-side ball head to realize gap discharge can be only fixedly arranged in a gas insulation tube shell at the top of the transformer and is electrically connected with a neutral point of the transformer, namely, the gap distance between the two ball heads can be changed through the movement of the moving-side ball head, an SF6 gas medium is punctured when the gap distance between the two ball heads reaches the puncture distance in an SF6 gas environment, and discharge is carried out between the two ball heads and a grounding current passes through the two ball heads;

the moving-side ball head 9123 needs to be arranged in the second metal shell and is kept above the static-side ball head 9125, and insulating gas can be filled between the moving-side ball head 9123 and the static-side ball head 9125 through the sealing of the second metal shell or through the sealing of an insulating and shielding structure in the shell;

when the conducting rod 9122 slides to the top position of the second metal shell, the movable-side ball head 9123 and the static-side ball head 9125 are insulated;

when the conducting rod slides to the bottom of the second metal shell, an insulating gas gap is punctured between the movable-side ball head 9123 and the static-side ball head 9125 for discharging.

Referring to fig. 6 to 10, the oil conservator may be further configured as follows to save the material required by the switch oil conservator, ensure the internal structure of the oil conservator is regular, and facilitate the sealing of the capsule. In order to facilitate the maintenance of the oil conservator by an operator, the breathing channel, the vacuumizing channel and the switch cabinet breathing channel of the switch oil conservator of the oil conservator can be further extended to the lower part of the side wall of the transformer along the outer side of the main body of the transformer, so that the breathing devices and the valve structures at the tail end of the channel are ensured to be positioned at the height position close to the maintenance personnel. From this, this application can separate independent design with transformer oil conservator and switch oil conservator, makes things convenient for the maintainer to operate and compress the shared volume of oil conservator, with transformer integration to accord with the installation space requirement:

the oil conservator 1 is a flat polygon prism structure, an inflatable capsule 10 is hung on the top of the oil conservator through a hook structure shown in fig. 8, for the convenience of installation, a hand hole can be further opened on the top of the oil conservator near the hook, sealing is realized through a hand hole cover plate with an electric laminated wood 33 shown in fig. 10, and air pocket is avoided through the electric laminated wood on the back of the cover plate;

the switch oil conservator 7 is arranged on one side end face of the oil conservator 1 and is independent of the oil conservator 1;

the main air pipe is arranged in an installation gap between the oil conservator 1 and the transformer 9, one end of the main air pipe is connected with the bottom of the oil conservator 1, the other end of the main air pipe is connected with the transformer 9, the main air pipe has a slope which is inclined upwards from a cover 9 of a main transformer body box by no less than 2 degrees, so that gas escaping upwards from the oil tank is easy to accumulate into the gas relay through the main air pipe, the main air pipe is only connected with a corrugated pipe and the gas relay, butterfly valves are arranged at two ends of the gas relay, and then the main air pipe is directly led to the box cover in a downward slope of 3 percent, the length of the whole main air pipe is small, and the gas relay is exposed outside the oil conservator and is easy to overhaul and maintain;

the capsule lifting seat 2 is arranged at the top end of the oil conservator 1, is fixedly connected with the top of the capsule 10, and forms a gas containing cavity between the top of the capsule and the top end of the capsule lifting seat 2 in a sealing way;

a breathing passage which is communicated 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 transformer 9 to adjust the breathing state of the capsule 10;

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

The capsule elevation seat 2 at the middle position of the top of the conservator structure can be further arranged in the way of fig. 7 to comprise:

a lifting seat main body which is connected with the top end of the oil conservator 1 and is provided with an opening at the top;

a capsule elevation seat cover plate 22, hermetically connected with the elevation seat body, closing the opening;

the capsule connecting flange 20 is connected with the capsule lifting seat cover plate 22 in a sealing mode at the top, is arranged at the bottom and is connected with the top of the capsule 10 in a sealing mode, and is internally provided with a flange channel communicated with the inside of the capsule 10.

Therefore, the bottom of the respirator pipe joint 21 can be connected with the capsule lifting seat cover plate 22 into a whole, and the top of the respirator pipe joint is connected with a breathing channel; an air release plug 23 of the oil conservator can be arranged on the capsule lifting seat cover plate 22 and is communicated with the vacuumizing channel and the gas containing cavity; and a first sealing ring 201 and a second sealing ring 202 are respectively arranged between the capsule lifting seat cover plate 22 and the capsule connecting flange 20 and between the capsule lifting seat cover plate 22 and the lifting seat main body, and the second sealing ring 202 surrounds the double-layer sealing structure formed outside the first sealing ring 201 to strengthen the sealing performance of the capsule during breathing, so that the capsule lifting seat is not easy to accumulate gas entering the oil conservator due to untight sealing.

The switch oil conservator independently arranged outside the oil conservator can be connected with a switch breathing channel independent of the oil conservator 1 and a switch oil conservator air release plug 71 through the structure shown in figure 9, so that the oil conservator independently arranged through a cylinder structure reduces the material consumption of an oil tank, reduces the volume space occupied by the switch oil conservator, moves the position of the switch oil conservator according to the position of a switch head cover, and is convenient to overhaul and maintain a load switch. In fig. 6, the connection mode that the switch oil conservator is directly welded on the end cover plate can also enhance the structural strength of the end cover plate of the oil conservator.

Correspondingly, the breathing passage of the switch cabinet in the present application may be specifically configured to include the following components as shown in fig. 9:

a breather connecting pipe 72 which extends upwards from the bottom of the switch oil conservator 7 to the top end of the interior of the switch oil conservator 7;

the switch oil conservator breather 8 is connected with the tail end of the breather connecting pipe 72, and is arranged on the outer side of the lower part of the transformer 9 together with the breather and the valve of the transformer so as to be convenient for the maintenance of operators;

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

and the switch cabinet breathing channel, the breathing channel connected with the oil storage cabinet and the vacuumizing channel are mutually connected and communicated through a horizontally arranged pressure balance valve, the vacuumizing is synchronously performed, and the load switch connected with the switch oil storage cabinet 7 and the transformer main body are kept in a pressure balance state in the vacuumizing process.

The upper, middle and lower oil sampling valve of this application transformer tank concentrates at the oil tank outside and is a slash and arranges at the oil tank middle part to do benefit to the convenient oil sampling of user. The internal lower oil sampling valve is led to the lower part of the oil tank along the inner wall of the oil tank in the oil tank through a connecting pipe of DN 15; the internal upper oil sampling valve is led to the upper part of the oil tank along the inner wall of the oil tank from a connecting pipe of DN15 in the oil tank. The oil tank lifting bar adopts a round steel structure, mechanical strength is enhanced through tank wall reinforcing ribs and tank wall reinforcing plates, and the sealing plates are welded outside to block movement of lifting ropes.

In addition, inside this application transformer, the sleeve pipe between transformer and the GIS equipment all adopts the insulating mode of GIL hard tube to realize with being qualified for the next round of competitions, and accessible GIL shell pipeline reliably grounds, can not receive natural environment's influence completely, patrols and examines and maintains for making daily electrified and provide the safety guarantee, and convenient.

The trend of the GIS equipment pipeline that this application adopted can set up to the appearance phase-match with the transformer, the appearance of wholeness design and planning transformer and the trend of GIS pipeline, make both more coordinate the matching, it is compacter reasonable to make the overall appearance of transformer substation arrange, the geographical space who has reduced occupation, the land area has been practiced thrift, and corresponding reduction civil engineering work volume, the actual construction cost can reduce, not only can solve the difficult problem that the land resource is scarce when some transformer substation construct now, also accord with the development trend of the resource-conserving type society of current construction sustainable development.

The transformer and the GIS equipment are integrally designed, the connection interface of the transformer and the GIS equipment is integrally designed, the displacement compensation device is designed for the connection of the inner central conductor and the outer pipeline, the transformer and the GIS equipment are simpler to connect through prefabricated production in a factory, the transformer and the GIS equipment are installed in a modularized mode on site, the installation process can be simplified, and the overall appearance of the transformer is more compact, reasonable and reliable.

To sum up, this application is according to the overall structure overall arrangement and the in-service use demand of opening and become all-in-one, and whole transformer tank of redesign reduces whole overall dimension by a wide margin to satisfy the less special demand in compact intelligent transformer substation occupation of land space. And the oil tank has simple and beautiful appearance, easy manufacture and installation, and quick and convenient use and maintenance. The transformer oil tank of this application has following characteristics:

1. the transformer adopts a flat-top box cover, the oil tank adopts a barrel type and upper and lower bolt type connecting structure, the lower oil tank is designed into a groove type structure with a smaller inner space size than the upper oil tank, the lower oil tank is of a U-shaped bending structure, the mechanical strength is good, commonly used box bottom reinforcing ribs can be omitted, and in addition, a part of transformer oil can also be saved. The lower oil saving tank and the upper oil saving tank are directly welded together through the lower tank edge, and the reinforcing ribs are made of flat plate type reinforcing iron. The reinforcing ribs are provided with lug holes for bidirectional dragging of the oil tank. The whole oil tank main body is designed into a square structure, is simple and attractive in design, is simple and convenient to process and manufacture, and is beneficial to installation of various groups of components on site and subsequent use and maintenance of customers.

2. The cooling mode is changed from a natural oil circulation cooling mode ONAN or ONAF into a forced oil circulation cooling mode ODAF, the fan of the finned radiator is replaced by an air cooler, the cooling capacity of the air cooler is large, the cooling requirement of the whole transformer can be met only by 1 group of coolers, and in addition, 1 group of standby coolers are arranged on the side, 2 groups of coolers are arranged on the side, the length size of the transformer is only increased, the width size of the whole transformer is greatly reduced, and the occupied space of the 2 groups of coolers is far smaller than that of the finned radiator during natural oil circulation cooling. And when the cooler is arranged on the side, the length size of the transformer is only increased, the width size of the whole transformer is greatly reduced, and the overall appearance size and the occupied space of the transformer are greatly reduced. And the space occupied by the finned radiator on the two long shaft sides is not available, the installation space of the assembly is wider, the layout of the assembly can be more humanized, and the subsequent use and maintenance of a client are facilitated.

3. The outgoing mode of the high-voltage side sleeve and the low-voltage side sleeve of the transformer is not led out from the top of an oil tank cover like a conventional transformer, but is led out from the walls of the high-voltage side and the low-voltage side of the oil tank, the high voltage is not a conventional oil-air sleeve, but an oil-SF 6 sleeve, and the high-voltage side sleeve is directly connected with GIS equipment through a closed GIL pipeline. The low-voltage sleeve does not adopt a conventional pure magnetic sleeve, but adopts a cable plug type sleeve, and is led out downwards through a cable. The connection form of the high-voltage sleeve and the low-voltage sleeve is a full insulation form, and the external electrical insulation distance does not need to be considered. The high-pressure lifting seat is heavy in weight due to the fact that transformer oil is contained in the high-pressure lifting seat, and the lower portion of the high-pressure lifting seat is provided with an inclined support frame for strengthening mechanical strength.

4. The conservator is of a flat octagonal configuration rather than the conventional drum-type configuration. The flat structure has reduced the overall height of oil conservator compared with cask formula structure. In addition, the external electrical insulation distance of the high-low pressure sleeve pipe is not required to be considered, the oil conservator is directly arranged on the high-voltage side of the tank cover in parallel with the long shaft, the height of a tank foot of the oil conservator is greatly reduced, and only the disassembly and assembly height of a gas relay on the main gas guide pipe is required to be reserved. The height of the entire transformer is thus greatly reduced.

5. All flange mounting holes welded on the tank cover and the tank wall of the oil tank are designed to be blind holes, a concave sealing groove is designed between the central hole of the flange and the mounting hole, and an O-shaped sealing ring is installed to enhance the sealing effect and prevent oil leakage of the transformer.

6. The machining precision of the sealing surface, the slotting size of the sealing groove and the chamfer size of the periphery are reasonably designed, the compression amount of the O-shaped sealing ring is ensured to be between 30 and 35 percent, different materials are selected according to the actual use environment and conditions of the transformer, and oil-resistant sealing gaskets with different temperatures are endured, so that the sealing effect is enhanced, and oil leakage of the transformer is prevented.

7. All mounting base plate trompils all design for the slotted hole of cross to reserve and adjust installation margin, make things convenient for subsequent installation of each part.

8. During design, a welding operation space and a painting operation space of the steel structural part are fully reserved, cross welding seams are avoided, and notches are added at the intersection of all the welding seams. The welding operation is simpler, the welding quality is improved, and the quality of the welding seam is inspected by means of nondestructive inspection and the like.

9. A large amount of mounting plate designs to detachable bottom plate, can directly change when design or processing mistake, has avoided the secondary to fire the cutting and destroy the surface paint on the oil tank, has improved installation effectiveness and product quality.

10. When all bigger steel structure spare interconnect, the junction welding ground connection double-screw bolt to install the short circuit of ground connection, the case is followed and is covered on the high low pressure side both sides of edge major axis direction totally 4 departments of installing the short circuit copper bar, with the security when improving electrified maintenance.

11. The surface of the box cover is coated with anti-skid paint, and a safety belt hook bottom plate is welded on the box cover so as to increase the safety during field installation and subsequent maintenance.

12. All instruments can be clearly seen by human eyes standing around the transformer. All valves, oil sampling valves, moisture absorbers, gas collecting boxes and the like are arranged at places which are 1-1.3 meters away from the ground and can be conveniently operated by people.

13. The top end of the ladder stand is right opposite to the gas relay, so that the observation and the maintenance of personnel are facilitated. The whole appearance of the transformer is compact, simple and attractive, the occupied space is greatly reduced, and the special requirement that the occupied space of the compact intelligent transformer substation is small is met.

The above are merely embodiments of the present application, and the description is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the protection scope of the present application.

Claims (9)

1. A transformer tank, comprising:

the upper oil-saving tank comprises a main body structure and high-pressure oil-SF 6 sleeves (93), each high-pressure oil-SF 6 sleeve (93) is connected with one phase of a high-pressure outgoing line of the transformer, each phase of high-pressure oil-SF 6 sleeve (93) is horizontally arranged at the top of one side of the main body structure along the length direction of the main body structure, and the height of each high-pressure oil-SF 6 sleeve (93) is lower than that of the main body structure;

the lower oil-saving tank is hermetically connected with the upper oil-saving tank and used for sealing the transformer and the insulating oil;

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

2. The transformer tank of claim 1, wherein the top of the main structure of the upper tank adopts a flat-top cover, and the bottom of the upper tank is welded and sealed with the top of the lower tank.

3. The transformer tank of claim 2, wherein the top of the upper tank is further provided with a conservator which is of a flat octagonal structure and stores insulating oil therein, the conservator is provided with a main air pipe arranged in a mounting gap between the conservator and the main structure, and a pressure adjusting channel communicated with the interior of the conservator, and the pressure adjusting channel extends from the top of the conservator to the lower part of the side wall of the upper tank after horizontally extending to the edge of the side wall of the upper tank and then bending and extending downwards.

4. A transformer tank according to claim 3, characterized in that the conservator is mounted horizontally on the flat top cover on the side close to the high pressure oil-SF 6 bushing (93) in the direction of the long axis of the upper tank.

5. The transformer tank of claim 2, wherein the lower oil-saving tank is recessed in the middle to form a tank body, the outer periphery of the lower oil-saving tank forms a horizontal welding installation surface, the horizontal welding installation surface is welded and fixed with the bottom of the upper oil-saving tank, a base seat connected with the outer periphery of the tank body is further arranged below the horizontal welding installation surface, and the length and the width of the tank body are smaller than those of the main structure of the upper oil-saving tank.

6. The transformer tank of claim 5, wherein the upper tank communicates with the inside of the tank body, and is provided with:

the three-phase coils are sequentially arranged along the length direction of the upper-section oil tank main body structure;

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

7. The transformer tank of claim 6, characterized in that the high pressure oil-SF 6 bushings (93) of each phase are horizontally connected to the gas-insulated bushings (94) matching the phase, and the lower side of each high pressure oil-SF 6 bushing (93) of each phase is provided with a support bracket supported outside the transformer (9) tank.

8. The transformer tank of claim 7, wherein a mounting bottom plate is arranged at the bottom of the support frame, a criss-cross slotted hole is formed in the mounting bottom plate, a countersunk screw is arranged in the criss-cross slotted hole, and the countersunk screw is fixedly connected with a stud welded on the side wall of the upper tank to fix the support frame.

9. The transformer tank of any one of claims 1 to 8, wherein the upper tank is further provided with a plurality of flat plate-type reinforcing irons at the periphery, and the upper and lower sides of the flat plate-type reinforcing irons are respectively provided with lug holes.

Images