CN204441048U - Rewinding material railway traction transformer - Google Patents

Abstract

The utility model discloses a wound core railway traction transformer, which relates to the technical field of electric power equipment. The utility model includes an iron core, a high and low voltage coil, a high and low voltage lead wire, a transformer oil tank, a high voltage bushing, and a low voltage bushing. The two horizontal frame sides of the iron core frame are provided with outwardly convex radians, the vertical frame sides of two adjacent rectangular iron core frames are pasted together and bound together with binding bands to form a core column, and the vertical frame sides of the three rectangular iron core frames are two-by-two Bundled and assembled into a three-dimensional triangular wound core structure, the cross-section of the core is a segmented polygon; it also includes a double-layer hexagonal integral web structure for supporting and fixing the core and high and low voltage coils, high voltage bushings and The low-voltage bushing is arranged on the transformer oil tank. The utility model has the advantages of reasonable structure, good heat dissipation effect, less no-load load loss, light weight, small body volume and low production cost.

Description

Wound Core Railway Traction Transformers

technical field

The utility model relates to the technical field of electric power equipment, in particular to a wound core railway traction transformer.

Background technique

The current S13 three-dimensional wound core transformer is limited to 10kV small-capacity distribution transformer products. Due to small capacity, low voltage level, large no-load loss and large noise. It is not suitable for the power supply needs of railways, locomotives, etc.

Utility model content

The technical problem to be solved by the utility model is to provide a wound core railway traction transformer, which can reduce no-load loss, no-load current and noise level.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a wound core railway traction transformer, including iron core, high and low voltage coils, high and low voltage lead wires, transformer oil tank, high voltage bushing, low voltage bushing, the iron core includes Three rectangular iron core frames with the same structure are made of high magnetic permeability cold-rolled silicon steel sheets. Bind together with binding bands to form a core column, and the sides of the mullions of the three rectangular iron core frames are bound in pairs to form a three-dimensional triangular coiled iron core structure, and the cross section of the iron core is a segmented polygon;

It also includes a double-layer hexagonal one-piece integral web structure for supporting and fixing the iron core and high and low voltage coils;

It also includes the on-load tap-changer, which is fixed on the support of the on-load tap-changer. There are several terminals on the on-load tap-changer, which are used to connect with the lead wires drawn from the high-voltage coil;

The high-voltage bushing and the low-voltage bushing are arranged on the transformer oil tank.

Further, the double-layer hexagonal integral web structure includes a double-layer upper clamp and a double-layer lower clamp, and the double-layer upper clamp and the double-layer lower clamp are connected by connecting screws.

Further, the double-layer hexagonal integral web structure, the iron core and the high and low voltage coils wound on the core legs are arranged in the transformer oil tank.

Further, the cross section of the transformer oil tank is rectangular.

The beneficial effect produced by adopting the above-mentioned technical scheme is that: the double-layer upper and lower clamp structure in the utility model fully fixes the iron core and the winding, which ensures the overall stability of the device body and the strength of hoisting. The distance between the lead wires is guaranteed to ensure the balance of the lead wire resistance; the three iron core frames are assembled to shorten the distance between the iron yokes, the volume and weight of the iron core are reduced, and the no-load loss can be greatly reduced after the iron core is annealed. Traction transformers are widely used in power supply for railways and locomotives.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Figure 2 is a schematic diagram of the overall external structure of the transformer;

Fig. 3 is a schematic structural view of one side of Fig. 1;

Fig. 4 is a structural schematic diagram of an iron core;

Fig. 5 is a schematic diagram of the limit installation position at the bottom of the fuel tank;

In the figure: 1. High voltage bushing; 2. Transformer oil tank; 3. Double-layer upper clamp; 4. Iron core; 5. High and low voltage coil; 6. High and low voltage lead; 7. Double-layer lower clamp; Tube; 9. Oil tank bottom limit; 10. On-load tap changer; 11. Transformer; 12. 0-phase bushing; 13. Oil conservator; 14. Chip radiator; 15. Terminal box.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Referring to Fig. 1, the utility model comprises iron core 4, high and low voltage coil 5, high and low voltage lead wire 6, transformer oil tank 2, high voltage bushing 1, low voltage bushing 8, on-load tap changer, radiator, and described iron core 4 It includes three rectangular core frames made of high magnetic permeability cold-rolled silicon steel sheets with the same structure. The two horizontal frame sides of the rectangular core frame are provided with outwardly convex arcs. Bind them together with binding bands to form a core column. The sides of the mullions of the three rectangular core frames are bound in pairs to form a three-dimensional triangular coiled core structure. The cross section of the core 4 is a segmented polygon, as shown in FIG. 2 .

It also includes a double-layer hexagonal integral web structure for supporting and fixing the iron core 4 and the high and low voltage coils 5. The double-layer hexagonal frame includes a double-layer upper clamp 3 and a double-layer lower clamp 7, The double-layer upper clamping part 3 and the double-layer lower clamping part 7 are connected by connecting screws.

The double-layer hexagonal integral web structure, the iron core 4 and the high and low voltage coils 5 wound on the core of the iron core 4 are arranged in the fuel tank.

The transformer adopts the on-load voltage regulation method, and the on-load tap-changer is fixed on the on-load tap-changer bracket. There are several terminals on the on-load tap-changer for connecting with the lead wires drawn from the high-voltage coil.

The high-voltage bushing 1 and the low-pressure bushing 8 are arranged on the oil tank.

An oil channel is provided between the high voltage coil and the low voltage coil of the high and low voltage coil 5 .

The cross section of the fuel tank is rectangular.

As shown in Fig. 5, there is an oil tank bottom limit between the transformer oil tank and the double-layer lower clamp.

The transformer body of the utility model adopts a double-layer hexagonal integral web structure, and the upper and lower clamps of the double layers are tightened by pulling screws, and the upper and lower clamps of the double layers are respectively provided with a pressure plate and a supporting plate to form a whole with the clamps. , There is a limit at the bottom of the double-layer lower clamp, which fully fixes the core and windings, ensuring the overall stability of the body and the strength of the hoisting. Both sides of the high and low voltage coils are provided with split backing plates, pressure plates, and end rings, which are fixed by pull screws and clip limit round steel.

The assembly process of the utility model is as follows: iron core production (core blanking, curve cutting, winding, annealing, assembly, painting and binding) --- core turning installation --- coil winding on the iron core --- body turning ---Installing the web ---Preparation of high-voltage and low-voltage lead switches, etc. ---Production of the fuel tank shell ---Assembly of the body and the fuel tank shell ---Assembly of components ---Vacuum oil filling ---Test.

The utility model adopts a closed-ended wound iron core structure, the core column is a segmented polygonal type, and the iron core is composed of a closed iron core frame.

Each segment of the core frame is continuously wound on the core block by the winding equipment segment by segment, without seams. The core frame is annealed in an annealing furnace, and the stress can be completely eliminated after annealing, giving full play to the characteristics of high magnetic permeability cold-rolled silicon steel sheets. No-load loss and no-load current are greatly reduced.

The iron core is fixed by special winding equipment, and the winding is directly wound on the iron core column by means of gear abrasives and winding steel cylinders. The reverse winding method is used to ensure that the end face of the bottom of the winding is kept horizontal. Since each winding is wound together in turn, the insulation between the windings can be closely matched to form a whole, so that the concentricity of the winding stays, air passages, etc. ability to short circuit.

The body uses a polygonal integral web structure to fully fix the iron core and windings, ensuring the overall stability of the body and the strength of hoisting.

The body and shell adopt multi-point positioning up and down, and the positioning is uniform and reliable.

This product reduces the no-load loss of the transformer core by more than 30% compared with the current S11 type, the load loss is reduced by more than 10%, the no-load current is reduced by more than 70% and the noise is more than 10dB. The utilization rate of core raw materials is increased by 5-6%, and the material utilization rate is approximately 100%. The same type of products reduces the weight of the core, the volume of the body, and reduces the cost of materials.

Claims (4)

1. a rewinding material railway traction transformer, comprise iron core (4), high-voltage coil and low-voltage coil (5), high-low voltage leads (6), oil tank of transformer (2), bushing (1), low-tension bushing (8), it is characterized in that, described iron core (4) comprises the identical rectangular core frame be made up of high magnetic conduction cold-reduced silicon sheet of three structures, two transverse frame edges of rectangular core frame are provided with cambered outwards radian, fit and use binding strap colligation to form stem together in the munnion limit of adjacent two rectangular core frames, the munnion limit colligation between two of three rectangular core frames is assemblied into stereo-triangular wound core structure, the cross section of described iron core (4) is segmented polygon,

Also comprise the overall web structure of double-deck hexagon integral type, for supporting and fixed iron core (4) and high-voltage coil and low-voltage coil (5);

Also include on-load shunting switch, be fixed on on load tap changer support, on load tap changer is provided with some binding posts, for connecting with the lead-in wire of drawing from high-tension coil;

Bushing (1) and low-tension bushing (8) are arranged on oil tank of transformer (2).

2. rewinding material railway traction transformer according to claim 1, it is characterized in that, the overall web structure of described double-deck hexagon integral type comprises double-deck upper clamping piece (3) and double-deck lower clamping piece (7), adopts connecting screw rod to connect between double-deck upper clamping piece (3) and double-deck lower clamping piece (7).

3. rewinding material railway traction transformer according to claim 1, it is characterized in that, described double-deck hexagon integral type overall web structure, iron core (4) and the high-voltage coil and low-voltage coil (5) be wound on iron core (4) stem are arranged in oil tank of transformer (2).

4. rewinding material railway traction transformer according to claim 1, is characterized in that, the cross section of described oil tank of transformer (2) is rectangle.