CN218414155U - Low-voltage 690V/400V double-voltage three-phase oil-immersed distribution transformer - Google Patents

Abstract

The utility model provides a two voltage three-phase oil-immersed distribution transformer of 690V 400V of low pressure belongs to distribution transformer device technical field, including transformer housing, the last termination that is equipped with of transformer housing, termination includes high-pressure termination and low pressure termination, be equipped with primary, secondary and magnetic core in the transformer housing, primary and secondary are 3 groups respectively, the primary coiling is inboard at secondary, primary and high-pressure termination electric connection, secondary and low pressure termination electric connection, secondary includes first secondary and second secondary, first secondary and second secondary series connection, the other end and the neutral row of first secondary are connected. The utility model provides a transformer can provide the problem of double-circuit power supply simultaneously to satisfy convenient to use's function, practiced thrift the fund input.

Description

Low-voltage 690V/400V double-voltage three-phase oil-immersed distribution transformer

Technical Field

The utility model belongs to the technical field of distribution transformer device, concretely relates to two voltage three-phase oil-immersed distribution transformer of low pressure 690V 400V.

Background

The transformer is a power distribution device, is suitable for a three-phase alternating current power supply system with the rated frequency of 50Hz, provides power for a motor and other electrical equipment, and is widely applied to industrial production departments such as chemical industry, mines and the like. At present, no transformer product capable of meeting the requirements of two voltages of 690V and 400V simultaneously and operating at full load exists in a transformer with the voltage of more than 200kVA, and when partial users need the two voltages to output, the common mode adopted is as follows: two transformers are configured, each transformer outputs corresponding different voltages, and the transformers are started and stopped according to voltage requirements. Therefore, it is necessary to design a three-phase oil-immersed distribution transformer capable of satisfying the operation of 690V/400V dual voltage at full load at the same time so as to satisfy the requirement that the low-voltage side of the transformer simultaneously supplies power to two different voltage systems.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model adopts the technical scheme that:

the utility model provides a 690V 400V dual voltage three-phase oil-immersed distribution transformer, includes the transformer casing, be equipped with termination on the transformer casing, termination includes high-pressure termination and low pressure termination, high-pressure termination and low pressure termination establish to a plurality of respectively, be equipped with primary, secondary and magnetic core in the transformer casing, primary and secondary are the coiling respectively on the magnetic core, primary and secondary are 3 groups respectively, the primary coiling is inboard at secondary, primary and high-pressure termination electric connection, secondary and low pressure termination electric connection, secondary includes first secondary and second secondary, first secondary and second secondary series connection, the other end and the neutral row of first secondary are connected.

According to the technical scheme, the wiring device comprises a wiring tube, a wiring rod is arranged in the wiring tube in a penetrating mode, the wiring tube is in threaded connection with the wiring rod, the lower end of the wiring rod is connected with the inner coil of the transformer shell, a nut is arranged on the wiring rod, the nut is abutted to the lower end of the wiring tube, a through groove is transversely formed in the wiring tube, a screw rod is arranged in the wiring tube in a penetrating mode, the screw rod is in threaded connection with the wiring tube, and a square handle is arranged at the top end of the screw rod.

Preferably, the lower end of the screw rod is fixedly provided with a pressing plate, the pressing plate is an arc-shaped plate, and the pressing plate can move up and down in the through groove.

Preferably, the lower end of the through groove is provided with a concave groove.

Preferably, two ends of the first secondary coil are respectively electrically connected with different low-voltage wiring devices.

Preferably, a D-type connection method is adopted among the 3 groups of primary coils.

Preferably, a Y-type connection method is adopted among the 3 groups of secondary coils.

Preferably, the wire barrel is square or cylindrical.

Preferably, the wire connecting pipe is made of aluminum.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model provides a two voltage three-phase oil-immersed distribution transformer of 690V 400V of low pressure, the utility model provides a transformer can provide the problem that the dual-circuit power supply supplied power simultaneously to satisfy convenient to use's function, practiced thrift the fund input.

2. The utility model provides a two voltage three-phase oil-immersed distribution transformer of 690V 400V of low pressure, the utility model discloses in adopt can one kind can connect the termination of line changing fast, very big improvement the work efficiency of installation and maintenance transformer.

Drawings

FIG. 1 is a schematic view of the appearance structure of the device of the present invention;

FIG. 2 is a schematic top view of the present invention;

fig. 3 is a schematic diagram of the winding structure of the present invention;

fig. 4 is a schematic structural view of the wiring device of the present invention.

In the figure: 1. the transformer comprises a transformer shell, 2, a wiring device, 3, a primary coil, 4, a secondary coil, 5, a first secondary coil, 6, a second secondary coil, 8, a high-voltage wiring device, 9, a low-voltage wiring device, 10, a wiring pipe, 11, a wiring rod, 12, a nut, 13, a through groove, 14, a screw rod, 15, a square handle, 16, a pressing plate, 17 and a concave groove.

Detailed Description

The following embodiments are described in detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the components or elements of the present disclosure, and do not refer to any components or elements in the present disclosure, and are not to be construed as limiting the present disclosure.

Example 1

As shown in fig. 1-4, the utility model provides a 690V 400V dual voltage three-phase oil-immersed distribution transformer of low pressure, including transformer housing 1, be equipped with termination 2 on transformer housing 1, termination 2 includes high-pressure termination 8 and low pressure termination 9, establish respectively to a plurality of for high-pressure termination 8 and low pressure termination 9, be equipped with primary 3, secondary 4 in the transformer housing 1, primary 3 and secondary 4 coil wind respectively on the magnetic core, primary 3 and secondary 4 are 3 groups respectively, primary 3 coiling is inboard at secondary 4, primary 3 and high-pressure termination 8 electric connection, secondary 4 and low pressure termination 9 electric connection, secondary 4 includes first secondary 5 and second secondary 6, first secondary 5 and second secondary 6 series connection, the other end and the neutral row of first secondary 5 are connected. The embodiment of the utility model provides an in, the coil wire cross-section is confirmed according to rated current to transformer secondary coil winding. The lower electric current of general voltage is big more, and the wire cross-section of use is big more, the utility model discloses what make is 690V and 400V double voltage transformer, calculates respectively according to 690V and 400V coil wire and confirms the specification, can compromise economic nature, reduce cost when satisfying 690V and 400V full load operation. And determining the number of coil turns according to the rated voltage, wherein the number of 400V winding turns is contained in the 690V winding turns. When the secondary coil winding is wound, the 400V winding is wound to the designed number of turns, then tapping is carried out, the wire is changed, the remaining 290V turns are wound, and the taps are welded in series to achieve the total number of turns of 690V. The secondary winding thus comprises two voltage taps, each connected to a low-voltage connection device 9, for supplying the electrical power at different voltages simultaneously. The embodiment of the utility model provides an in, 3 low pressure termination 9 in low pressure left side are 690V, and 3 low pressure termination 9 in right side are 400V, and sharing zero line low pressure termination 9 is on the rightmost side. When a user performs wiring, the 690V wiring device and the 400V wiring device can be directly wired respectively, the 690V control cabinet and the 400V control cabinet are respectively led in, the control cabinet can be used for switching the use voltage conveniently, and wiring is convenient. The utility model discloses low pressure 690V 400V double-voltage three-phase oil-immersed distribution transformer can replace 2 ordinary distribution transformer of single voltage, and area is little, and light in weight is favorable to sparingly investing in, the transportation of being convenient for. The investment cost can be saved by more than 30% by using one low-voltage 690V/400V double-voltage three-phase oil-immersed distribution transformer. The low-voltage 690V/400V double-voltage three-phase oil-immersed distribution transformer can be operated simultaneously or independently between different voltages, and is convenient for users to use.

Termination 2 includes wiring pipe 10, wear to be equipped with terminal pole 11 in the wiring pipe 10, wiring pipe 10 and 11 threaded connection of wiring pole, 11 lower extremes of wiring pole are connected with the coil in the transformer housing 1, be equipped with nut 12 on the wiring pole 11, nut 12 and the butt of wiring pipe 10 lower extreme, logical groove 13 has transversely been seted up to wiring pipe 10, wear to be equipped with screw rod 14 in the wiring pipe 10, screw rod 14 and wiring pipe 10 threaded connection, the 14 tops of screw rod are equipped with square handle 15. In the embodiment of the utility model provides an in, the terminal pole 11 is used for being connected through coil winding in insulating part and the transformer casing 1 the utility model discloses when the device was implemented, can adopt general ordinary transformer structure, install the terminal of ordinary transformer to terminal pipe 10 on, fasten terminal pipe 10 with the nut. The embodiment of the utility model provides a during the device wiring, place logical groove 13 after peeling the outer insulation to high-pressure side or low pressure side cable, screw through screw rod 14 for fixed high pressure or low tension cable. The utility model discloses need not when the transformer wiring at crimping binding post, directly compress tightly at screw rod 14 and lead to groove 13 directly, the utility model discloses install and overhaul the wiring fast convenient, improved work efficiency. In the embodiment of the present invention, the top end of the screw rod 14 is set to be square handle shape, and also can be set to be hexagonal, so that the screw rod 14 can be operated when the cable is compressed, and meanwhile, the top end of the screw rod 14 can also be set to be a horizontal force applying rod, so as to enhance the pressing force of the screw rod 14 on the cable.

Two ends of the first secondary coil 5 are respectively electrically connected with different low-voltage wiring devices 9.

In the embodiment of the utility model, 3 group adopt the D type to connect between the primary coil 3. And the 3 groups of secondary coils 4 are connected in a Y-shaped mode. The transformer winding is arranged to be a high-voltage winding on the inner side and a low-voltage winding on the outer side, so that low-voltage tapping is facilitated. The high-voltage winding adopts a D connection mode, the anti-harmonic capability is enhanced, 5 gears are arranged, and gear tapping leads are led out from the high-voltage oil passage and the low-voltage oil passage to the tapping switch after being wrapped and insulated. The low voltage adopts a Y connection mode, the head part connects three phases by a zero line bar, the tail part is used as a tap, and the head part is led to the position of the box cover after being welded by a copper bar to be connected with the conducting rod, so that the connection is convenient.

The transformer connection group is Dyyn11.

The wire barrel 10 is square or cylindrical. The wire connecting tube 10 is made of aluminum. In the embodiment of the present invention, the wire connecting tube 10 can be made of copper, aluminum, or copper-aluminum. Transformer terminal 11 is mostly the copper pole material, and the cable is generally mostly aluminium core, therefore the material of junction box 10 can be selected to the aluminium material, prevents to form oxide layer increase contact resistance when the cable contacts. As a further preference, a copper plating may be applied to the thread on the inner wall of the barrel 10 to prevent the formation of an oxide layer between the barrel 10 and the terminal rod 11, which is more advantageous in enhancing the electrical conductivity.

Example 2

As shown in fig. 1-4, the utility model provides a 690V 400V dual voltage three-phase oil-immersed distribution transformer of low pressure, including transformer housing 1, be equipped with termination 2 on transformer housing 1, termination 2 includes high-pressure termination 8 and low pressure termination 9, establish respectively to a plurality of for high-pressure termination 8 and low pressure termination 9, be equipped with primary 3, secondary 4 in the transformer housing 1, primary 3 and secondary 4 coil wind respectively on the magnetic core, primary 3 and secondary 4 are 3 groups respectively, primary 3 coiling is inboard at secondary 4, primary 3 and high-pressure termination 8 electric connection, secondary 4 and low pressure termination 9 electric connection, secondary 4 includes first secondary 5 and second secondary 6, first secondary 5 and second secondary 6 series connection, the other end and the neutral row of first secondary 5 are connected. The difference between this embodiment and embodiment 1 is that a pressing plate 16 is fixed at the lower end of the screw 14, the pressing plate 16 is an arc-shaped plate, and the pressing plate 16 can move up and down in the through slot 13. The lower end of the through groove 13 is provided with a concave groove 17. The embodiment of the utility model provides an in, be clamp plate 16 and concave groove 17 for compressing tightly high pressure or low tension cable, clamp plate 16 and concave groove 17 set up respectively to relative arc plate structure, can protect the cable not damaged when compressing tightly the cable, and the cable compresses tightly more firmly when two arc plate structures simultaneously. The embodiment of the utility model provides an in, clamp plate 16 can adopt articulated mode with the fixed connection mode of screw rod 14, when processing clamp plate 16, sets up the pipe in clamp plate 16's upper end, and the pipe transversely sets up the through-hole, and screw rod 14 is pegged graft in the pipe on clamp plate 16, also is provided with the through-hole at screw rod 14's tip simultaneously, after screw rod 14 precession junction box 10, links together clamp plate 16 and screw rod 14 through the fixed pin.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions and substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.

Claims (9)

1. The utility model provides a low pressure 690V 400V dual voltage three-phase oil-immersed distribution transformer, includes transformer housing (1), its characterized in that:

be equipped with termination (2) on transformer casing (1), termination (2) include high-voltage wiring device (8) and low pressure wiring device (9), establish respectively into a plurality of high-voltage wiring device (8) and low pressure wiring device (9), be equipped with primary coil (3), secondary coil (4) in transformer casing (1), primary coil (3) and secondary coil (4) are the coiling respectively on the magnetic core, primary coil (3) and secondary coil (4) are 3 groups respectively, primary coil (3) coiling is inboard at secondary coil (4), primary coil (3) and high-voltage wiring device (8) electric connection, secondary coil (4) and low pressure wiring device (9) electric connection, secondary coil (4) include first secondary coil (5) and second secondary coil (6), first secondary coil (5) and second secondary coil (6) series connection, the other end and the neutral bank of first secondary coil (5) are connected.

2. The low-voltage 690V/400V dual-voltage three-phase oil-immersed distribution transformer of claim 1, wherein:

junction device (2) include junction box (10), junction pole (11) wear to be equipped with in junction box (10), junction box (10) and junction pole (11) threaded connection, coil connection in junction pole (11) lower extreme and transformer casing (1), be equipped with nut (12) on junction pole (11), nut (12) and junction box (10) lower extreme butt, logical groove (13) have transversely been seted up in junction box (10), wear to be equipped with screw rod (14) in junction box (10), screw rod (14) and junction box (10) threaded connection, screw rod (14) top is equipped with square handle (15).

3. The low-voltage 690V/400V dual-voltage three-phase oil-immersed distribution transformer of claim 2, wherein:

the lower end of the screw rod (14) is fixedly provided with a pressing plate (16), the pressing plate (16) is an arc-shaped plate, and the pressing plate (16) can move up and down in the through groove (13).

4. The low-voltage 690V/400V dual-voltage three-phase oil-immersed distribution transformer of claim 2, wherein:

the lower end of the through groove (13) is provided with a concave groove (17).

5. The low-voltage 690V/400V dual-voltage three-phase oil-immersed distribution transformer of claim 1, wherein:

and two ends of the first secondary coil (5) are respectively electrically connected with different low-voltage wiring devices (9).

6. The low-voltage 690V/400V dual-voltage three-phase oil-immersed distribution transformer of claim 1, wherein:

and D-type connection is adopted among the 3 groups of primary coils (3).

7. The low-voltage 690V/400V dual-voltage three-phase oil-immersed distribution transformer of claim 1, wherein:

and Y-type connection is adopted among the 3 groups of secondary coils (4).

8. The low-voltage 690V/400V dual-voltage three-phase oil-immersed distribution transformer of claim 2, wherein:

the wire connecting pipe (10) is square or cylindrical.

9. The low-voltage 690V/400V dual-voltage three-phase oil-immersed distribution transformer of claim 2, characterized in that:

the wiring tube (10) is made of aluminum.

Images