CN205487707U - On -load voltage -regulating transformer's voltage regulation coil integrated configuration - Google Patents

Abstract

The utility model relates to a combination structure of a voltage regulating coil of an on-load voltage regulating transformer, which comprises a high voltage regulating coil and a medium voltage regulating coil. Between the coil and the lower high voltage regulating coil, the upper high voltage regulating coil and the lower high voltage regulating coil are connected in parallel. Without transposition, the parallel wires in the strands are transposed once at half the height of the respective coils. The inter-strand wires are connected in series. The wires are connected in series. The beneficial effects of the utility model are: the high-voltage voltage-regulating coil is divided into upper and lower parts and connected in parallel with each other, so that the ampere-turn distribution tends to be more balanced when the high-voltage voltage-regulating coil is tapped and switched, the lateral magnetic flux leakage is small, and the electromotive force is also small when short-circuited.

Description

Combination structure of a voltage regulating coil of an on-load voltage regulating transformer

technical field

The utility model relates to a combined structure of a voltage regulating coil of an on-load voltage regulating transformer.

Background technique

Chinese patent document CN201601006U discloses a voltage regulating coil structure of an on-load voltage regulating transformer, including a medium voltage voltage regulating coil and a high voltage voltage regulating coil, the high voltage voltage regulating coil is divided into upper and lower parts, and the upper and lower parts are connected in series; The medium-voltage voltage-regulating coil is arranged between the upper and lower parts of the high-voltage voltage-regulating coil. The high-voltage voltage regulating coil and the medium-voltage voltage regulating coil are respectively wound on the 4mm thick hard insulating cylinder assembly, and the outside is locked by anti-locking stays; the upper part of the high-voltage voltage regulating coil, the medium-voltage voltage regulating coil and the lower part of the high-voltage voltage regulating coil Axial set. Both the upper and lower end faces of the high-voltage voltage regulating coil and the medium-voltage voltage regulating coil are provided with end rings with a thickness of 20 mm. The clear distance between the upper part of the high voltage regulating coil and the head end of the high voltage coil is >160mm, the net distance between the lower part of the high voltage regulating coil and the iron yoke is >120mm, and the clear distance between the high voltage regulating coil and the medium voltage regulating coil is >160mm.

The above-mentioned patented technical solution has the following defects: 1) Since the high-voltage voltage regulating coil is connected in series by the upper and lower parts, and the ±8×1.25% gear voltage regulation is realized through forward and reverse switching, when part or all of the taps of the upper or lower voltage regulating coil are cut off , will form a transverse magnetic flux leakage at the upper or lower part, and will generate a large electromotive force in the axial direction when the external short circuit occurs; 2) The clear distance between the high-voltage voltage regulating coil and the medium-voltage voltage regulating coil is > 160mm and the height of 120mm is composed of spacers , the structure of the entire voltage regulating coil is not compact, and the mechanical stability is poor; 3) The upper and lower parts of the high-voltage voltage regulating coil and the medium-voltage voltage regulating coil are arranged in a set, which increases the complexity of the process; 4) The head and end of the high-voltage coil are drawn out horizontally, so that The insulation distance between the high-voltage coil and the voltage-regulating coil is increased, the height of the center of gravity of the entire body is increased, the structural stability is poor, and the cost of effective materials such as silicon steel, oil and steel plates is increased.

Utility model content

The technical problem to be solved by the utility model is: to provide a voltage regulating coil combination structure of an on-load voltage regulating transformer to solve the problem of flux leakage balance when the upper and lower high voltage voltage regulating coils are tapped and switched.

The technical solution adopted by the utility model to solve the technical problem is: a combination structure of the voltage regulating coil of the on-load voltage regulating transformer, including a high voltage regulating coil and a medium voltage regulating coil, and the high voltage regulating coil is divided into upper and lower parts, They are the upper high voltage regulating coil and the lower high voltage regulating coil, the medium voltage regulating coil is located between the upper high voltage regulating coil and the lower high voltage regulating coil, the upper high voltage regulating coil and the lower high voltage regulating coil are connected in parallel, and the upper high voltage regulating coil is connected in parallel. The voltage regulating coil, the lower high voltage voltage regulating coil and the medium voltage voltage regulating coil are arranged on the same axis, the upper high voltage voltage regulating coil adopts a double helix structure and is wound in the right direction, and the inter-strands are not transposed, and the parallel wires in the strands are in their respective Transpose once at half of the coil height, the inter-strand wires are connected in series, the lower high-voltage voltage regulating coil adopts a double-helix structure and is wound leftward, and the inter-strands are not transposed, and the parallel wires in the strands are transposed at half the coil height of each Once, the inter-strand conductors are connected in series, the medium-voltage voltage regulating coil is wound leftward in a double-helix structure, and the inter-strand conductors are not transposed, and the inter-strand conductors are connected in series.

It is further defined that the upper high voltage voltage regulating coil, the lower high voltage voltage regulating coil and the medium voltage voltage regulating coil are wound on the same insulating cylinder assembly.

It is further defined that both ends of the upper high-voltage voltage regulating coil, the lower high-voltage voltage regulating coil and the medium-voltage voltage regulating coil are equipped with inner and outer angle rings placed alternately, and the upper end of the upper high-voltage voltage regulating coil, the upper high-voltage voltage regulating coil and the medium-voltage voltage regulating coil Between the pressure coils, between the medium voltage regulator coil and the lower high voltage regulator coil, and at the lower end of the lower high voltage regulator coil, insulating end rings are provided for insulation separation. The voltage regulating coil formed by the pressure coil is wrapped around the locking stay, and the locking stay is wrapped around the screen.

It is further defined that the coil lead-out wires of the upper high-voltage voltage regulating coil, the lower high-voltage voltage regulating coil and the medium-voltage voltage regulating coil are led out in a radial direction.

It is further defined that the insulating cylinder assembly is composed of an insulating cylinder and T-shaped stays, and the T-shaped stays are evenly distributed along the outer circumference of the insulating cylinder.

The beneficial effects of the utility model are: the high-voltage voltage-regulating coil is divided into upper and lower parts and connected in parallel with each other, so that the ampere-turn distribution tends to be more balanced when the high-voltage voltage-regulating coil is tapped and switched, the lateral magnetic flux leakage is small, and the electromotive force is also small when short-circuited; The inner and outer corner rings at the end of the coil reduce the insulation distance between the high voltage voltage regulating coil and the medium voltage voltage regulating coil, making the whole transformer structure more compact and effectively reducing the cost of materials; the high and medium voltage voltage regulating coils are all wound on the same insulating cylinder assembly On the top, insulating end rings are installed at the end of the coil and between the coils, which helps to improve the axial mechanical stability of the coil and improve the mechanical strength of the voltage regulating coil against short circuit; the locking stay and surrounding screen outside the voltage regulating coil serve as oil flow guide Function, the coil heat dissipation effect is good, and the insulation distance between phases can be reduced.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described;

Fig. 1 is the wiring schematic diagram of the high-voltage coil of the present utility model;

Fig. 2 is a structural schematic diagram of a voltage regulating coil of the present invention;

Fig. 3 is a structural schematic diagram of an insulating cylinder assembly of the present invention;

In the figure, 1. Upper high voltage voltage regulating coil, 2. Lower high voltage voltage regulating coil, 3. Medium voltage voltage regulating coil, 4. Insulation cylinder assembly, 4-1. Insulation cylinder, 4-2. T-shaped stay, 5. Inner and outer angle rings, 6. Insulating end rings, 7. Locking stays, 8. Surrounding screens, 9. Coil lead wires, 10. Contacts of voltage regulating switches, 11. High voltage coils.

detailed description

As shown in Figures 1, 2 and 3, a combination structure of a voltage regulating coil of an on-load voltage regulating transformer includes a high-voltage voltage regulating coil and a medium-voltage voltage regulating coil 3. The high-voltage voltage regulating coil is divided into upper and lower parts. The high voltage regulating coil 1 and the lower high voltage regulating coil 2, the medium voltage regulating coil 3 is located between the upper high voltage regulating coil 1 and the lower high voltage regulating coil 2, the upper high voltage regulating coil 1 and the lower high voltage regulating coil 2 are connected in parallel Connection, the upper high-voltage voltage regulating coil 1, the lower high-voltage voltage regulating coil 2 and the medium-voltage voltage regulating coil 3 are arranged on the same axis, and the upper high-voltage voltage regulating coil 1 adopts 8 strands of wires and is divided into two groups according to the double helix structure. The parallel wires in the strands are transposed once at half the height of the respective coils, and the lower high-voltage voltage regulating coil 2 is divided into two groups with 8 strands and wound wires according to the double helix structure. , and the inter-strands are not transposed, the parallel wires in the strands are transposed once at half the height of the respective coils, and the medium-voltage voltage regulating coil 3 is divided into two groups with self-adhesive transposition conductors and wound leftward in a double-helix structure, and the strands There is no transposition between the strands, and the wires between the strands are connected in series. The high-voltage coil 11 is led out in the axial direction. The coil lead wires 9 of the upper high-voltage voltage regulating coil 1 , the lower high-voltage voltage regulating coil 2 and the medium-voltage voltage regulating coil 3 are led out in a radial direction. As shown in FIG. 1 , the coil lead wires 9 of the high-voltage voltage regulating coil are respectively connected to the contacts 10 of the voltage regulating switch.

The upper high voltage voltage regulating coil 1 , the medium voltage voltage regulating coil 3 and the lower high voltage voltage regulating coil 2 are sequentially wound on the same pre-processed insulating cylinder assembly 4 . The insulating cylinder assembly part 4 is made up of insulating cylinder 4-1 and T-shaped stay 4-2, and T-shaped stay 4-2 is equally distributed along the outer circumference of insulating cylinder 4-1, and one end of T-shaped stay 4-2 is connected with The insulation cylinder 4-1 is flush, and the other end protrudes from the insulation cylinder 4-1 by about 200-250 mm. The T-shaped stay 4-2 is cut with a notch along the edge of the insulation cylinder 4-1. ～4mm cardboards are lapped and surrounded. The laps are sloped and bonded with insulating glue, heated and cured to form, and a stay is placed at the laps.

Both ends of the upper high voltage regulating coil 1, the lower high voltage regulating coil 2 and the medium voltage regulating coil 3 are equipped with inner and outer angle rings 5 which are staggered and formed by corrugating 0.5 mm thick cardboard and then bent. More specifically, the inner and outer corner rings 5 are placed at the first and last turns of the wires at the two ends of the upper high voltage voltage regulating coil 1 , the lower high voltage voltage regulating coil 2 and the medium voltage voltage regulating coil 3 .

Set at the upper end of the upper high voltage regulating coil 1, between the upper high voltage regulating coil 1 and the medium voltage regulating coil 3, between the medium voltage regulating coil 3 and the lower high voltage regulating coil 2, and at the lower end of the lower high voltage regulating coil 2 The insulating end ring 6 formed by rolling and forming a number of cardboards is insulated and separated, and the leading edge of the insulating end ring 6 is rounded, and the distance between the high-voltage voltage regulating coil and the medium-voltage voltage regulating coil 3 is ≤150mm.

The voltage regulating coil composed of the upper high-voltage voltage regulating coil 1, the lower high-voltage voltage regulating coil 2 and the medium-voltage voltage regulating coil 3 is wrapped around the locking stay 7, and the locking stay 7 is wrapped around the surrounding screen 8, and the surrounding screen 8 consists of two 3mm Cardboard lapped. The surrounding screen 8 has a rectangular outlet at the lead-out line 9, and the rectangular outlet is chamfered.

The implementation of the technical proposal can further simplify the processing procedure and improve the production efficiency, economy and reliability on the basis of the current technology.

Claims (5)

1. a voltage regulation coil combinative structure for ULTC, is characterized in that: include high pressure line pressure regulator Circle and middle pressure voltage regulation coil (3), high pressure voltage regulation coil is divided into upper and lower two parts, is top high pressure pressure regulation respectively Coil (1) and bottom high pressure voltage regulation coil (2), middle pressure voltage regulation coil (3) is positioned at top high pressure line pressure regulator Between circle (1) and bottom high pressure voltage regulation coil (2), top high pressure voltage regulation coil (1) and bottom high pressure are adjusted Line ball circle (2) is connected in parallel, top high pressure voltage regulation coil (1), bottom high pressure voltage regulation coil (2) and in Pressure voltage regulation coil (3) is arranged on the same axis,

Top high pressure voltage regulation coil (1) uses double-screw type structure right around to coiling, and does not replaces between stock, In stock, parallel conducting wire replaces once at respective coil height half, and between stock, wire uses and is connected in series,

Bottom high pressure voltage regulation coil (2) uses double-screw type structure left around to coiling, and does not replaces between stock, In stock, parallel conducting wire replaces once at respective coil height half, and between stock, wire uses and is connected in series,

Middle pressure voltage regulation coil (3) uses double-screw type structure left around to coiling, and does not replaces between stock, between stock Use between wire and be connected in series.

The voltage regulation coil combinative structure of ULTC the most according to claim 1, is characterized in that: Described top high pressure voltage regulation coil (1), bottom high pressure voltage regulation coil (2) and middle pressure voltage regulation coil (3) It is wound on same insulating cylinder assembly parts (4).

The voltage regulation coil combinative structure of ULTC the most according to claim 1, is characterized in that: Described top high pressure voltage regulation coil (1), bottom high pressure voltage regulation coil (2) and middle pressure voltage regulation coil (3) Two ends be mounted on the inside and outside square ring (5) that is staggeredly placed,

In high pressure voltage regulation coil (1) upper end, top, top high pressure voltage regulation coil (1) and middle pressure voltage regulation coil (3) between, between middle pressure voltage regulation coil (3) and bottom high pressure voltage regulation coil (2) and the high pressure of bottom Voltage regulation coil (2) lower end arranges insulating end ring (6) and carries out dielectric separation,

On top high pressure voltage regulation coil (1), bottom high pressure voltage regulation coil (2) and middle pressure voltage regulation coil (3) Voltage regulation coil outer wrap locking stay (7) constituted, locking stay (7) outer wrapping screen (8).

The voltage regulation coil combinative structure of ULTC the most according to claim 1, is characterized in that: Described top high pressure voltage regulation coil (1), bottom high pressure voltage regulation coil (2) and middle pressure voltage regulation coil (3) Lead-out wires of coil (9) use the mode of radial extraction to draw.

The voltage regulation coil combinative structure of ULTC the most according to claim 2, is characterized in that: Described insulating cylinder assembly parts (4) are made up of insulating cylinder (4-1) and T-shaped stay (4-2), T-shaped stay (4-2) uniform along insulating cylinder (4-1) outer circumference decile.