CN214043387U

CN214043387U - Three-phase double-voltage combined type oil-immersed step-up transformer easy to migrate

Info

Publication number: CN214043387U
Application number: CN202023247120.1U
Authority: CN
Inventors: 肖俊承; 王一龙; 赵楠楠; 王路阳
Original assignee: Eaglerise Electric and Electronic China Co Ltd; Foshan Shunde Eaglerise Electric Power Technology Co Ltd; Jian Eaglerise Electric Co Ltd
Current assignee: Eaglerise Electric and Electronic China Co Ltd; Foshan Shunde Eaglerise Electric Power Technology Co Ltd; Jian Eaglerise Electric Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-08-24
Anticipated expiration: 2030-12-28

Abstract

The utility model discloses an easily migrating three-phase double-voltage combined type oil-immersed step-up transformer, the step-up transformer main body comprises an iron core, a high-voltage coil and a low-voltage coil, the iron core is formed into a four-frame five-column plane winding iron core structure by four iron core frames on the same plane, the high-voltage coil of each phase comprises a first basic winding, a second basic winding, a first series parallel winding, a second series parallel winding and an integrated switch, and the integrated switch is provided with a group of change-over switch and two groups of tapping regulating switches; the transformer can realize conversion among different voltage grades and adjustment of tapping voltage under the same voltage grade, has high reliability, small volume, anti-theft and anti-misoperation functions, is convenient to install, and does not need to be replaced by a new transformer after the power station migrates.

Description

Three-phase double-voltage combined type oil-immersed step-up transformer easy to migrate

Technical Field

The utility model relates to a transformer field especially relates to an easily migrating three-phase double-voltage combined type oil-immersed step-up transformer.

Background

In some underdeveloped countries and regions such as southeast Asia, south Asia, Africa and central and south America and partial regions of partial developed countries, the electricity consumption is increased along with the economic development, but the construction of electric power infrastructure is delayed and the demand cannot be met in time. For this reason, several power equipment suppliers at home and abroad have specially developed a combined type transportable natural gas (or diesel) power plant which can be built and installed in a short time and can be rapidly put into use as a main unit. In a leasing mode, the power utilization requirements of the regions are met within a certain period of time, and the leasing expiring power station can integrally migrate to the next country and region with the power utilization requirements.

However, the power grid frequency and the voltage grade of the power transmission line are different between different countries and regions, and a new step-up transformer needs to be replaced when the power station migrates, so that the problems of idle waste and cost increase of the original step-up transformer are caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an oily step up transformer of three-phase dual-voltage combination formula of easily migrating can realize the conversion between different voltage grades and adjust the shunting voltage under the same voltage grade, and the reliability is high, and is small, has the theftproof and prevents the maloperation function, and simple to operate, need not change the transformer of renewal after the power station migrates.

To achieve the purpose, the utility model adopts the following technical proposal:

a three-phase double-voltage combined oil-immersed step-up transformer easy to migrate comprises a step-up transformer main body, a high-voltage coil and a low-voltage coil, wherein the step-up transformer main body comprises an iron core;

the iron core is of a four-frame five-column plane wound iron core structure formed by four iron core frames on the same plane, frame columns of two adjacent iron core frames are combined into one iron core column, and a high-voltage coil and a low-voltage coil of each phase are assembled on the same iron core column in an axial split structure mode;

the high-voltage coil of each phase comprises a first basic winding, a second basic winding, a first series-parallel winding, a second series-parallel winding and an integrated switch, wherein the integrated switch is provided with a group of change-over switches and two groups of tapping regulating switches;

the change-over switch of each phase is provided with five contacts a, b, c, d and e, the high-voltage coil wiring structure of each phase is that one end of the first basic winding and one end of the second basic winding are electrically connected to the input end A of each phase, one end of the first series of parallel windings, the other end of the first basic winding and the other end of the second basic winding are electrically connected to the contact e of the change-over switch, the other end of the first series of parallel windings is electrically connected with the contact c of the change-over switch, one end of the second series of parallel windings is electrically connected with the contact b of the change-over switch, and the other end of the second series of parallel windings is electrically connected with the contact d of the change-over switch; the first series of parallel windings and the second series of parallel windings are also respectively electrically connected with a group of tapping regulating switches;

the connection relation of the first basic winding, the second basic winding, the first series-parallel connection winding and the second series-parallel connection winding is changed by changing the connection relation of five contacts of the change-over switch, and two voltages with different voltage values are formed.

Preferably, the low voltage coil of each phase consists of a first low voltage winding and a second low voltage winding split into an axial arrangement, said first and second low voltage windings being electrically uncoupled; the first basic winding and the second basic winding of each phase are axially arranged and connected in parallel corresponding to the first low-voltage winding and the second low-voltage winding, and the first series of parallel windings and the second series of parallel windings are axially arranged corresponding to the first basic winding and the second basic winding.

Preferably, the four iron core frames of the iron core are two side opening seam side iron core frames and two bottom opening seam main iron core frames respectively, the two bottom opening seam main iron core frames are arranged adjacently, the two side opening seam side iron core frames are located on two sides of the two bottom opening seam main iron core frames respectively, and the three-phase high-voltage coil connection is a triangular connection.

Preferably, two groups of tapping regulating switches of each phase are provided with a plurality of tapping contacts, the first series of parallel windings and the second series of parallel windings are provided with a plurality of connecting contacts, and the connecting contacts of the first series of parallel windings and the second series of parallel windings are electrically connected with the corresponding tapping contacts of the tapping regulating switches in a one-to-one correspondence manner.

Preferably, still include oil tank and control chamber, the step up transformer main part is located the inside of oil tank, the control chamber includes high tension cable storehouse, low pressure operation storehouse and high pressure operation storehouse, oil tank and control chamber formula structure as an organic whole, the operation end of the integrated switch of step up transformer main part is located high pressure operation storehouse, high tension cable storehouse pass through high-tension bushing with the three-phase port of the high-pressure side of step up transformer main part is connected, low pressure operation storehouse pass through low-tension bushing with the three-phase port of the low pressure side of step up transformer main part is connected.

Preferably, the high-voltage cable storehouse does the three-phase of step-up transformer main part is equipped with corresponding high-voltage fuse, high-voltage arrester, high-voltage sensor, high-voltage load switch and earthing switch respectively, the one end and the high-voltage bushing electricity of high-voltage fuse are connected, the other end and the one end electricity of high-voltage load switch of high-voltage fuse are connected, the other end electricity of high-voltage load switch is connected with high-voltage arrester and high-voltage sensor, earthing switch electricity connect in the other end of high-voltage fuse, the operating ends of high-voltage load switch and earthing switch are located high-voltage operation storehouse.

Preferably, the bin door of the high-voltage cable bin consists of an inner door and an outer door, the outer door is provided with a safety anti-theft lock, and the inner door is provided with an electromagnetic lock with live misoperation prevention; the electromagnetic lock is electrically connected to the other end of the high-voltage load switch.

Preferably, the low-voltage operation cabin is provided with an electromagnetic lock power switch, a high-voltage cabin lighting power switch and two generator power supply ports, and the electromagnetic lock power switch, the high-voltage cabin lighting power switch and the two generator power supply ports are electrically connected with the three-phase port on the low-voltage side of the step-up transformer main body through a low-voltage sleeve.

Preferably, the oil tank is provided with a capsule oil conservator, an oil level gauge is arranged on an oil supply pipeline of the capsule oil conservator, and the oil tank is further provided with a thermometer and a pressure release valve.

Preferably, the first basic winding and the second basic winding have the same number of turns and the same wire specification cross-sectional area, and the first series of parallel windings and the second series of parallel windings have the same number of turns and the same wire specification cross-sectional area.

The three-phase double-voltage combined oil-immersed step-up transformer easy to migrate can be used in two main frequency power grid systems of 50Hz and 60Hz in the world, and is mainly characterized in that the two voltage levels commonly used in some countries and regions of a migratable power station with main requirements can be switched, and when the three-phase double-voltage combined oil-immersed step-up transformer is used in a 50Hz power grid system, the three-phase double-voltage combined oil-immersed step-up transformer can be connected to a 33kV line with a 35kV voltage level for step-up power transmission and can be connected to a 22kV or 21kV or 20kV line with a 20kV voltage level for step-up power transmission; when the power station is used for a 60Hz power grid system, the power station can be accessed to a 34.5kV line with a voltage level of 35kV for boosting transmission, and can be accessed to a 23kV or 22kV or 21kV line with a voltage level of 20kV for boosting transmission, the conversion is very convenient, and a new transformer is not required to be replaced after the power station migrates.

Drawings

The accompanying drawings are provided to further illustrate the present invention, but the content in the accompanying drawings does not constitute any limitation to the present invention.

Fig. 1 is a wiring structure diagram of a first switching state of a step-up transformer main body according to one embodiment of the present invention;

fig. 2 is a wiring structure diagram of the second switching state of the main body of the step-up transformer according to one embodiment of the present invention;

fig. 3 is a main structure diagram of a step-up transformer according to one embodiment of the present invention;

fig. 4 is a diagram of an arrangement structure of the main coil of the step-up transformer according to one embodiment of the present invention;

FIG. 5 is a front view of the fuel tank and operator compartment of one embodiment of the present invention;

FIG. 6 is a top view of the fuel tank and operator compartment of one embodiment of the present invention;

fig. 7 is an electrical wiring diagram of the fuel tank and the operation room according to one embodiment of the present invention.

Wherein: a booster transformer main body 10; an iron core 1; a high-voltage coil 2; a low-voltage coil 3; a first primary winding 21; a second primary winding 22; a first series of parallel windings 23; a second series-parallel winding 24; an integrated switch 25; a changeover switch 251; a tap changer 252; the first low-voltage winding 31; a second low voltage winding 32; a core frame 11 beside the side opening seam; the bottom opening joins the main core frame 12; an oil tank 4; an operation chamber 5; a high voltage cable compartment 51; a low-pressure operating cabin 52; a high-pressure operation chamber 53; a high-voltage bushing 6; a low-pressure bushing 7; a high-voltage fuse 511; a high voltage surge arrester 512; a high voltage load switch 513; a ground switch 514; an electromagnetic lock 515; an electromagnetic lock power switch 521; a high voltage compartment lighting power switch 522; a generator power supply port 523; a capsule type oil conservator 41; an oil level gauge 42; a thermometer 43; a pressure relief valve 44.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 4, the three-phase dual-voltage combined oil-immersed step-up transformer body 10 of the embodiment includes an iron core 1, a high-voltage coil 2, and a low-voltage coil 3;

the iron core 1 is of a four-frame five-column plane wound iron core structure formed by four iron core frames on the same plane, frame columns of two adjacent iron core frames are combined into one iron core column, and a high-voltage coil 2 and a low-voltage coil 3 of each phase are assembled on the same iron core column in an axial split structure mode;

the high-voltage coil 2 of each phase comprises a first basic winding 21, a second basic winding 22, a first series-parallel winding 23, a second series-parallel winding 24 and an integrated switch 25, wherein the integrated switch 25 is provided with a group of change-over switches 251 and two groups of tap-changing switches 252;

the change-over switch 251 of each phase is provided with five contacts a, b, c, d, e, the high-voltage coil 2 of each phase is connected in a wiring structure that one end of the first basic winding 21 and one end of the second basic winding 22 are electrically connected to the input end a of each phase, one end of the first series of parallel windings 23, the other end of the first basic winding 21 and the other end of the second basic winding 22 are electrically connected to the contact e of the change-over switch 251, the other end of the first series of parallel windings 23 is electrically connected to the contact c of the change-over switch 251, one end of the second series of parallel windings 24 is electrically connected to the contact b of the change-over switch 251, and the other end of the second series of parallel windings 24 is electrically connected to the contact d of the change-over switch 251; the first series-parallel winding 23 and the second series-parallel winding 24 are also electrically connected with a group of tap-changing switches 252;

the connection relationship of the first basic winding 21, the second basic winding 22, the first series-parallel winding 23 and the second series-parallel winding 24 is changed by changing the connection relationship of the five contacts of the changeover switch 251, so that two voltages with different voltage values are formed.

The iron core 1 can operate in two main frequency power grid systems of 50Hz and 60Hz, and the iron core 1 is a silicon steel sheet three-phase novel four-frame five-column plane wound iron core; compared with a silicon steel sheet three-phase laminated iron core, the iron core 1 of the embodiment can reduce the material and manufacturing cost, and has the advantages of low loss, low noise, small no-load current and the like due to few joints and high stacking coefficient in performance.

The high-voltage coil 2 and the low-voltage coil 3 of each phase are assembled on the same iron core column by adopting an axial split structure, after the high-voltage coil 2 is formed by connecting a first basic winding 21, a second basic winding 22, a first series parallel winding 23 and a second series parallel winding 2, the first basic winding 21 and the second basic winding 22 are firstly connected in parallel and then connected in series with the first series-parallel winding 23 and the second series-parallel winding 2, an integrated switch 25 is arranged on the connection between the first series-parallel winding 23 and the second series-parallel winding 2, the high-voltage phase lead wire and the tapping lead wire are connected with a group of change-over switches 251 and two groups of tapping regulating switches 252 of the integrated switch 25, and finally combined into a triangular connection, the conversion of the transformer working between two different voltages can be realized, the design innovation of high-voltage tapping voltage regulation adopts the series-parallel connection winding double-group voltage regulation, and the accuracy of the voltage regulation of the transformer working under two different voltages is ensured.

Taking one of three phases as an example, the dual-voltage working principle is explained: as shown in fig. 1, when the contacts b and c of the switch 251 are electrically connected and the contacts d and e are electrically connected, the switch 251 is in the parallel position, the first series-parallel winding 23 and the second series-parallel winding 2 are in the parallel state, and the transformer operates at a voltage level of 20 kV. As shown in fig. 2, when the contacts a and b of the switch 251 are electrically connected and the contacts c and d are electrically connected, the switch 251 is in the series position, the first series-parallel winding 23 and the second series-parallel winding 2 are in the series state, and the transformer operates at a voltage level of 35 kV. So that the conversion of the transformer operating voltage between 35kV and 20kV is achieved by the switching of the change-over switch 251.

Specifically, the low-voltage coil 3 of each phase is composed of a first low-voltage winding 31 and a second low-voltage winding 32 split into an axial arrangement, the first low-voltage winding 31 and the second low-voltage winding 32 being electrically unconnected; the first basic winding 21 and the second basic winding 22 of each phase are axially arranged and connected in parallel corresponding to the first low-voltage winding 31 and the second low-voltage winding 32, and the first series-parallel winding 23 and the second series-parallel winding 24 are axially arranged corresponding to the first basic winding 21 and the second basic winding 22.

Four iron core frames of the iron core 1 are respectively two side opening seam side iron core frames 11 and two bottom opening seam main iron core frames 12, the two bottom opening seam main iron core frames 12 are arranged adjacently, the two side opening seam side iron core frames 11 are respectively positioned at two sides of the two bottom opening seam main iron core frames 12, and the three-phase high-voltage coils 2 are connected in a triangular mode.

Four iron core frames of iron core 1 are two side opening seam other iron core frames 11 and two end opening seam main iron core frames 12 respectively, and two main iron core frames adopt the end opening promptly, and two other iron core frames adopt the side opening, compare with current iron core under the condition that the performance level is equivalent, this embodiment the manufacturing process of the inserted sheet of iron core 1, suit coil and transformer ware body is more simple high-efficient, more do benefit to the advantage of scale production.

Three groups of high-voltage coils 2 and low-voltage coils 3 of the three-phase transformer are sleeved with four core frames to complete closed open joints by firstly inserting a main core frame 12 of a bottom open joint, then inserting a core frame 11 beside a side open joint, and then assembling the high-voltage coils 2 and the low-voltage coils 3 on the same combined core column.

The connection of the high-voltage coil 2 is triangular connection, which can improve the unbalanced load carrying capacity and lightning protection performance of the transformer and the self-protection capacity when a phase-loss accident occurs

Furthermore, two groups of tapping regulating switches 252 of each phase are respectively provided with a plurality of tapping contacts, the first series of parallel windings 23 and the second series of parallel windings 24 are respectively provided with a plurality of connecting contacts, and the connecting contacts of the first series of parallel windings 23 and the second series of parallel windings 24 are respectively and correspondingly electrically connected with the tapping contacts of the corresponding tapping regulating switches 252.

One group of tap adjusting switches 252 of each phase is provided with tap contacts X2, X3, X4, X5, X6 and X7, the first series of parallel windings 23 are correspondingly provided with 6 connecting contacts, and the tap contacts X2, X3, X4, X5, X6 and X7 are respectively and correspondingly electrically connected with the 6 connecting contacts of the first series of parallel windings 23; the other group of tap adjusting switches 252 is provided with tap contacts X2 ', X3', X4 ', X5', X6 'and X7', the second series-parallel winding 24 is correspondingly provided with 6 connecting contacts, and the tap contacts X2 ', X3', X4 ', X5', X6 'and X7' are respectively and correspondingly electrically connected with the 6 connecting contacts of the second series-parallel winding 24.

Taking one of three phases as an example, the tapping voltage-regulating working principle is explained as follows: the first series of parallel windings 23 and the second series of parallel windings 24 of each phase are completely consistent in structure, when the change-over switch 251 is in a series position, the first series of parallel windings 23 and the second series of parallel windings 24 are in a series state, two groups of tapping connections are also in a series state, and the tapping position of the tapping adjusting switch 252 is adjusted, so that accurate adjustment of each tapping voltage of the transformer working at a 35kV voltage level can be realized; when the transfer switch 251 is in the parallel position, the first series-parallel winding 23 and the second series-parallel winding 24 are in the parallel state, and then the two groups of tapping connections are also in the parallel state, and the tapping position of the tapping adjusting switch 252 is adjusted, so that accurate adjustment of each tapping voltage of the transformer working at the voltage level of 20kV can be realized.

Further, still include oil tank 4 and control chamber 5, step-up transformer main part 10 is located the inside of oil tank 4, control chamber 5 includes high-voltage cable storehouse 51, low pressure operation storehouse 52 and high pressure operation storehouse 53, oil tank 4 and control chamber 5 formula structure as an organic whole, the operation end of the integrated switch 25 of step-up transformer main part 10 is located high pressure operation storehouse 53, high-voltage cable storehouse 51 through high-voltage bushing 6 with the three-phase port of the high pressure side of step-up transformer main part 10 is connected, low pressure operation storehouse 52 through low-voltage bushing 7 with the three-phase port of the low pressure side of step-up transformer main part 10 is connected.

The three-phase double-voltage combined type oil-immersed step-up transformer easy to migrate has the capacity range of 2500-6000 kVA, flexible capacity and good applicability, can be used in countries and regions with power shortage, and is mainly applied to step-up power transmission of a migratable power station which runs in a leasing mode and takes a natural gas (or diesel) generator as a main unit. The oil tank 4 and the operation chamber 5 are of an integrated structure, are fully sealed, and are compact in structure, high in reliability, small in size and convenient to install.

The oil tank 4 is made of 6-12 mm steel plates, and the operation chamber 5 is made of 2.5mm cold-rolled steel plates through splicing and special process treatment; the surfaces of the oil tank 4 and the operation room 5 are subjected to multi-channel rust prevention and paint spraying treatment, so that the paint box is attractive in appearance, has good corrosion resistance, can effectively prevent erosion of sand blown by wind and salt mist, and has strong solar ultraviolet resistance.

It should be noted that, the high-voltage cable cabin 51 is that three phases of the step-up transformer main body 10 are respectively provided with a corresponding high-voltage fuse 511, a corresponding high-voltage arrester 512, a corresponding high-voltage sensor, a corresponding high-voltage load switch 513 and a corresponding ground switch 514, one end of the high-voltage fuse 511 is electrically connected with the high-voltage bushing 6, the other end of the high-voltage fuse 511 is electrically connected with one end of the high-voltage load switch 513, the other end of the high-voltage load switch 513 is electrically connected with the high-voltage arrester 512 and the corresponding high-voltage sensor, the ground switch 514 is electrically connected with the other end of the high-voltage fuse 511, and the operating ends of the high-voltage load switch 513 and the ground switch 514 are arranged in the high-voltage operating cabin 53.

The high-voltage cable bin 51 is provided with the high-voltage fuse 511 and the high-voltage arrester 512 which are easy to replace and have different voltage levels, so that the protection of a power supply line and a transformer is enhanced, and the power supply reliability and the power supply quality of a power station are greatly improved.

More specifically, the bin door of the high-voltage cable bin 51 is composed of an inner door and an outer door, the outer door is provided with a safety anti-theft lock, and the inner door is provided with an electromagnetic lock 515 capable of preventing misoperation in a live state; the electromagnetic lock 515 is electrically connected to the other end of the high voltage load switch 513. The high-voltage cable storehouse 51 sets up inside and outside two doors, and the outer door is equipped with safe pickproof lock, and the inner door is equipped with electrified electromagnetic lock 515 of preventing maloperation, has effectively improved the reliability of the safe operation of transformer.

Preferably, the low-voltage operating cabin 52 is provided with an electromagnetic lock power switch 521, a high-voltage cabin lighting power switch 522 and two generator power supply ports 523, and the electromagnetic lock power switch 521, the high-voltage cabin lighting power switch 522 and the two generator power supply ports 523 are all electrically connected with the low-voltage side three-phase port of the step-up transformer main body 10 through a low-voltage bushing 7.

Two generator power supply ports 523 are provided, so that the first low-voltage winding 31 and the second low-voltage winding 32 are respectively connected to form three phases and then can be respectively connected with one generator in a matching way, and the generators can be operated independently, simultaneously or in parallel during use.

Further, the oil tank 4 is provided with a capsule type oil conservator 41, an oil level gauge 42 is arranged on an oil supply pipeline of the capsule type oil conservator 41, and the oil tank 4 is also provided with a thermometer 43 and a pressure relief valve 44. The oil level of the capsule type oil conservator 41 can be monitored by the oil level gauge 42, the temperature of the oil tank 4 can be monitored by the thermometer 43, and the internal pressure can be released by the pressure release valve 44 when the pressure of the oil tank 4 is overhigh, so that the use safety and reliability of the transformer are improved.

It should be noted that the first basic winding 21 and the second basic winding 22 have the same number of turns and the same wire gauge cross-sectional area, and the first series-parallel winding 23 and the second series-parallel winding 24 have the same number of turns and the same wire gauge cross-sectional area, so as to facilitate accurate switching and tapping of the operating voltage of the regulating transformer.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. The utility model provides an easy migration's oily step-up transformer of three-phase double-voltage combination formula, step-up transformer main part includes iron core, high-voltage coil and low-voltage coil, its characterized in that:

2. The migrating-prone three-phase dual-voltage combined oil-immersed step-up transformer of claim 1, characterized in that:

the low-voltage coil of each phase is composed of a first low-voltage winding and a second low-voltage winding which are split into axial arrangement, and the first low-voltage winding and the second low-voltage winding are not electrically connected; the first basic winding and the second basic winding of each phase are axially arranged and connected in parallel corresponding to the first low-voltage winding and the second low-voltage winding, and the first series of parallel windings and the second series of parallel windings are axially arranged corresponding to the first basic winding and the second basic winding.

3. The migrating-prone three-phase dual-voltage combined oil-immersed step-up transformer of claim 1, characterized in that: the four iron core frames of the iron core are respectively two side opening seam side iron core frames and two bottom opening seam main iron core frames, the two bottom opening seam main iron core frames are arranged adjacently, the two side opening seam side iron core frames are respectively positioned on two sides of the two bottom opening seam main iron core frames, and the three-phase high-voltage coil connection is triangular connection.

4. The migrating-prone three-phase dual-voltage combined oil-immersed step-up transformer of claim 1, characterized in that: and the two groups of tapping regulating switches of each phase are provided with a plurality of tapping contacts, the first series-parallel winding and the second series-parallel winding are provided with a plurality of connecting contacts, and the connecting contacts of the first series-parallel winding and the second series-parallel winding are electrically connected with the corresponding tapping contacts of the tapping regulating switches in a one-to-one correspondence manner.

5. The migrating-prone three-phase dual-voltage combined oil-immersed step-up transformer of claim 1, characterized in that: still include oil tank and control chamber, the step up transformer main part is located the inside of oil tank, the control chamber includes high tension cable storehouse, low pressure operation storehouse and high pressure operation storehouse, oil tank and control chamber formula structure as an organic whole, the operation end of the integrated switch of step up transformer main part is located high pressure operation storehouse, the high tension cable storehouse pass through high-tension bushing with the three-phase port of the high-pressure side of step up transformer main part is connected, low pressure operation storehouse pass through low-tension bushing with the three-phase port of the low pressure side of step up transformer main part is connected.

6. The migrating-prone three-phase dual-voltage combined oil-immersed step-up transformer of claim 5, characterized in that: the high-voltage cable storehouse does the three-phase of step-up transformer main part is equipped with corresponding high-voltage fuse, high-voltage arrester, high pressure sensor, high-voltage load switch and earthing switch respectively, the one end and the high-voltage bushing electricity of high-voltage fuse are connected, the other end of high-voltage fuse and the one end electricity of high-voltage load switch are connected, the other end electricity of high-voltage load switch is connected with high-voltage arrester and high pressure sensor, earthing switch electricity connect in the other end of high-voltage fuse, the operating end of high-voltage load switch and earthing switch is located high-voltage operation storehouse.

7. The migrating-prone three-phase dual-voltage combined oil-immersed step-up transformer of claim 6, further comprising: the bin door of the high-voltage cable bin consists of an inner door and an outer door, the outer door is provided with a safety anti-theft lock, and the inner door is provided with an electromagnetic lock with electric misoperation prevention; the electromagnetic lock is electrically connected to the other end of the high-voltage load switch.

8. The migrating-prone three-phase dual-voltage combined oil-immersed step-up transformer of claim 7, further comprising: the low pressure operation storehouse is equipped with electromagnetic lock switch, high-pressure storehouse lighting power switch and two generator power supply ports, electromagnetic lock switch, high-pressure storehouse lighting power switch and two generator power supply ports all through the low pressure sleeve pipe with the three-phase port electricity of the low pressure side of step-up transformer main part is connected.

9. The migrating-prone three-phase dual-voltage combined oil-immersed step-up transformer of claim 5, characterized in that: the oil tank is provided with a capsule oil storage cabinet, an oil level gauge is arranged on an oil supply pipeline of the capsule oil storage cabinet, and the oil tank is further provided with a thermometer and a pressure release valve.

10. The migrating-prone three-phase dual-voltage combined oil-immersed step-up transformer of claim 1, characterized in that: the first basic winding and the second basic winding have the same number of turns and the same specification cross-sectional area of the conducting wire, and the first series-parallel winding and the second series-parallel winding have the same number of turns and the same specification cross-sectional area of the conducting wire.