CN204441049U - Gas-insulating type three dimensional wound core power transformer - Google Patents

Abstract

The utility model discloses a gas-insulated three-dimensional wound iron core power transformer, which relates to the technical field of power equipment. The utility model includes an iron core, a high and low voltage coil, a high and low voltage lead wire, a transformer shell, 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 frame for supporting and fixing the core and high and low voltage coils, and the high voltage bushing and low voltage bushing are set on on the transformer housing. The utility model has the advantages of reasonable structure, good heat dissipation effect, less no-load load loss, light weight, small body volume, low manufacturing cost and low noise.

Description

Gas-insulated three-dimensional wound core power transformer

technical field

The utility model relates to the technical field of power equipment, in particular to a gas-insulated three-dimensional wound core power transformer.

Background technique

At present, the domestic S13 three-dimensional wound core transformer is limited to 10kV small-capacity distribution transformer products. Due to the small capacity and low voltage level, the energy-saving effect of a single unit is relatively small. Due to the large loss base of high-voltage and large-capacity transformer products, there is considerable room for energy consumption reduction. The current gas-insulated transformer core form adopts laminated cores. Since the insulating medium is gas, its volume and noise are relatively large.

Utility model content

The technical problem to be solved by the utility model is to provide a gas-insulated three-dimensional wound core power transformer, which has reasonable structure, good heat dissipation effect, less no-load load loss, light weight, low noise and low production cost.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a gas-insulated three-dimensional wound core power transformer, including an iron core, high and low voltage coils, high and low voltage leads, a transformer shell, a high voltage bushing, and a low voltage bushing. The core 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. The sides are pasted and tied together with binding bands to form a core column, and the sides of the vertical frames of the three rectangular iron core frames are bound in pairs to form a three-dimensional triangular coil core structure. The cross section of the iron core is a segmented polygon; The polygonal frame is used to support and fix the iron core and the high and low voltage coils. The double-layer hexagonal frame includes a double-layer upper clamp and a double-layer lower clamp. Between the double-layer upper clamp and the double-layer lower clamp is a The connecting screw is connected; the double-layer hexagonal frame, the iron core and the high and low voltage coils wound on the core column are arranged in the transformer shell; it also includes an on-load tap-changer fixed on the on-load tap-changer bracket, 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 shell, and the transformer shell is filled with SF insulating gas in vacuum.

The high and low voltage leads are arranged in a triangle in space.

The cross-section of the transformer housing is rectangular.

The beneficial effects produced by adopting the above technical solution are: the transformer shell of the utility model is vacuum-filled with SF6 insulating gas, and at the same time, a three-dimensional ring core structure is adopted to reduce noise and simplify the transformer structure.

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 shell; 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; 9. Limit position at the bottom of the transformer shell; 10. On-load tap changer; 11. Transformer; 12. 0-phase bushing; 14. Chip radiator and supporting fan; 15. Terminal box.

Detailed ways

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

In order to solve the problems of high noise and complicated structure of existing gas-insulated transformers, the utility model provides a gas-insulated three-dimensional wound core power transformer as shown in Fig. Lead wire 6, transformer casing 2, high-voltage bushing 1, low-voltage bushing 8, characterized in that the core 4 includes three rectangular core frames made of high-permeability cold-rolled silicon steel sheets with the same structure, and the rectangular core frame The sides of the two horizontal frames are provided with outwardly convex radians, the sides of the vertical frames of two adjacent rectangular iron core frames are pasted together and bound together with binding tapes to form a core column, and the sides of the vertical frames of the three rectangular iron core frames are bound and assembled in pairs. Three-dimensional triangular wound core structure, the cross-section of the core 4 is a segmented polygon; it also includes a double-layer hexagonal frame for supporting and fixing the iron core 4 and the high and low voltage coils 5, and the double-layer hexagonal frame includes The double-layer upper clamp 3 and the double-layer lower clamp 7 are connected by a connecting screw between the double-layer upper clamp 3 and the double-layer lower clamp 7; 4. The high and low voltage coils 5 on the core column are set in the transformer shell 2; it also includes an 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 for connecting with The lead wires drawn from the high-voltage coil are connected; the high-voltage bushing 1 and the low-voltage bushing 8 are arranged on the transformer shell 2, and the inside of the transformer shell 2 is vacuum-filled with SF6 insulating gas; the high-voltage and low-voltage lead wires 6 are arranged in a triangle in space; the transformer shell 2 has a rectangular cross-section.

The transformer body of the utility model adopts an integral double-layer hexagonal frame clamp structure, and the upper and lower double-layer clamps are tightened by pulling screws, and the upper and lower double-layer clamps are respectively provided with pressure plates and supporting plates to form a whole , 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 inflation ---Test.

Among them, the iron core adopts a closed three-dimensional triangular wound core structure, and the core column is a segmented polygonal type, which is assembled from three iron core frames. It can greatly reduce the no-load loss.

Each section of iron core of each iron core frame is wound by winding equipment on the mandrel piece by piece. The three core frames are respectively annealed in the annealing furnace. After annealing, the stress can be completely eliminated, and there is no high magnetic resistance in the magnetic circuit. The characteristics of the high magnetic permeability cold-rolled silicon steel sheet are fully utilized, and the three-phase magnetic circuit is completely symmetrical. The three iron core frames are bound and assembled into one body by binding bands to form a three-dimensional triangular iron core.

In the coil winding process, the iron core is fixed by special winding equipment, and the winding is directly wound on the iron core column by using 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 windings is completely consistent, eliminating the gap between the conventional transformer windings, and greatly improving the overall ability of the body to resist sudden short circuits.

The body uses a double-layer hexagonal overall frame structure to fully fix the iron core and windings, ensuring the overall stability of the body and the strength of hoisting.

The high and low voltage leads are arranged in a triangular space, which shortens the lead distance and ensures the balance of the lead resistance.

The body and the shell are positioned at 10 points up and down, and the plane of the positioning points is arranged in a triangle, and the positioning is uniform and reliable.

The utility model reduces the no-load loss of the transformer core. Compared with the current S11 type, the no-load consumption is reduced by more than 30%, the load loss is reduced by more than 10%, the no-load current is reduced by more than 70%, and the noise is reduced by more than 10dB. The utilization rate of core raw materials is increased by 5-6%, and the material utilization rate is close to 100%. Compared with the same type of products, the core weight and body volume are reduced, and the material cost is reduced.

Claims (3)

1. A gas-insulated three-dimensional wound core power transformer, including iron core (4), high and low voltage coils (5), high and low voltage leads (6), transformer shell (2), high voltage bushing (1), low voltage bushing ( 8), characterized in that the iron core (4) includes three rectangular iron core frames made of high magnetic permeability cold-rolled silicon steel sheets with the same structure, and the two horizontal frame sides of the rectangular iron core frame are provided with outwardly convex arcs , the mullion sides of two adjacent rectangular iron core frames are pasted together and bound together with binding bands to form a core column, and the mullion sides of three rectangular iron core frames are bound two by two to form a three-dimensional triangular coil core structure, and the iron core (4) The cross-section is a segmented polygon; it also includes a double-layer hexagonal frame for supporting and fixing the iron core (4) and high and low voltage coils (5), and the double-layer hexagonal frame includes a double-layer upper clamp ( 3) and the double-layer lower clamp (7), the double-layer upper clamp (3) and the double-layer lower clamp (7) are connected by connecting screws; the double-layer hexagonal frame, iron core (4) and The high-voltage and low-voltage coils (5) wound on the core (4) of the core are set in the transformer casing (2); the on-load tap-changer is also included, fixed on the on-load tap-changer bracket, on the on-load tap-changer A number of terminals are provided for connecting with the leads drawn from the high-voltage coil; the high-voltage bushing (1) and the low-voltage bushing (8) are arranged on the transformer casing (2), and the inside of the transformer casing (2) is vacuum-filled with SF6 insulating gas. 2. The gas-insulated three-dimensional wound core power transformer according to claim 1, characterized in that the high and low voltage lead wires (6) are arranged in a triangular shape in space. 3. The gas-insulated three-dimensional wound core power transformer according to claim 2, characterized in that the cross-section of the transformer casing (2) is rectangular.