CN202678060U

CN202678060U - Coils of resin-insulated dry-type power transformer

Info

Publication number: CN202678060U
Application number: CN 201220362732
Authority: CN
Inventors: 周正琪; 于爱梅; 管金超
Original assignee: TAIZHOU HAITIAN ELECTRICAL MANUFACTURING CO LTD
Current assignee: TAIZHOU HAITIAN ELECTRICAL MANUFACTURING CO LTD
Priority date: 2012-07-20
Filing date: 2012-07-20
Publication date: 2013-01-16
Anticipated expiration: 2022-07-20

Abstract

The utility model provides coils of a resin-insulated dry-type power transformer, and relates to the field of power transformers provided with resin insulating layers in a cast manner. According to the coils of the resin-insulated dry-type power transformer, a high-voltage coil inner heat radiating airway (2) is arranged in a high-voltage coil (1), a low-voltage coil inner heat radiating airway (5) is arranged in a low-voltage coil (4), a cured high-voltage coil-to-low-voltage coil resin insulating layer (3) is cast between an outer side of the low-voltage coil (4) sleeved at the outer part of an iron core (6) of the transformer and an inner side of the high-voltage coil (1) at the outer part, and angle rings (7) are connected to an upper end and a lower end of the cured high-voltage coil-to-low-voltage coil resin insulating layer (3). The coils of the resin-insulated dry-type power transformer provided by the utility model have the characteristics of small volume, low cost and high mechanical strength as the coils of the power transformer are connected by the resin insulating layer to form a whole.

Description

A kind of resin-insulated dry power transformer coil

Technical field

A kind of resin-insulated dry power transformer coil of the utility model relates to the dry-type power transformer coil field on the transformer core of being sleeved on that adds resin insulating barrier in cast between high-voltage coil and low-voltage coil.

Background technology

In the past high-tension coil and the meeting between the end, low-voltage coil two ends at dry-type power transformer produces creepage phenomenon, in order to increase the creepage distance between the end, high-voltage coil and low-voltage coil two ends, then should design a kind of novel resin-insulated dry power transformer coil.

Summary of the invention

The purpose of this utility model provides a kind of resin-insulated dry power transformer coil, be cast with resin insulating barrier between one deck high-voltage coil and low-voltage coil between high-tension coil and the low-voltage coil, and the up and down two ends of resin insulating barrier cast is connected with the annular square ring of evagination between this floor height low-voltage coil, to reach the purpose that increases between high-tension coil and the low-voltage coil two ends creepage distance in the air externally.

A kind of resin-insulated dry power transformer coil, by high-tension coil, resin insulating barrier between high-voltage coil and low-voltage coil, low-voltage coil, transformer core and square ring form, the air flue that dispels the heat in the high-tension coil is arranged in high-tension coil, the air flue that dispels the heat in the low-voltage coil is arranged in low-voltage coil, be cast with resin insulating barrier between the high-voltage coil and low-voltage coil that one deck solidifies between low-voltage coil outside the being sleeved on transformer core outside and the outside high-tension coil inboard, resin insulating barrier is connected with square ring in two ends up and down between high-voltage coil and low-voltage coil, and above structure consists of resin-insulated dry power transformer coil single piece.

The heat that a kind of resin-insulated dry power transformer coil of the utility model is produced by transformer core and high-voltage coil and low-voltage coil when operation, can dissipation of heat be gone out by the air that flows in the heat radiation air flue in heat radiation air flue and the low-voltage coil in high-tension coil, need not by the transformer oil cooling, therefore as dry-type power transformer.

Net leather cloth upper between the low-voltage coil outside and high-tension coil inboard has the poured with epoxy resin thing, forms resin insulating barrier between high-voltage coil and low-voltage coil, the dielectric strength of the transformer that can increase electric power after solidifying; The square ring that is connected with the annular that solidifies vertical evagination is also poured into a mould at the up and down two ends of resin insulating barrier between high-voltage coil and low-voltage coil, can increase the creepage distance between end, high-voltage coil and low-voltage coil two ends place's high-tension coil and low-voltage coil, thereby, can dwindle the spacing between the high-voltage coil and low-voltage coil, because resin insulating barrier intensity between high-voltage coil and low-voltage coil is good, therefore can reduce the thickness of resin insulating barrier between high-voltage coil and low-voltage coil.

A kind of resin-insulated dry power transformer coil of the utility model advantage is: the power transformer volume is little, can reduce cost, the resin insulating barrier that high-voltage coil and low-voltage coil is poured into a mould is connected, and has increased mechanical strength, and having improved transformer body can anti-sudden short circuit ability.

Description of drawings

Fig. 1: a kind of resin-insulated dry power transformer coil master looks partial schematic sectional view.

Fig. 2: a kind of resin-insulated dry power transformer coil is overlooked partial schematic sectional view.

Embodiment:

Referring to Fig. 1 and Fig. 2, a kind of resin-insulated dry power transformer coil, by high-tension coil 1, resin insulating barrier 3 between high-voltage coil and low-voltage coil, low-voltage coil 4, transformer core 6 and square ring 7 form, heat radiation air flue 2 in the high-tension coil is arranged in high-tension coil 1, heat radiation air flue 5 in the low-voltage coil is arranged in low-voltage coil 4, be cast with resin insulating barrier 3 between the high-voltage coil and low-voltage coil that one deck solidifies between low-voltage coil 4 outsides outside being sleeved on transformer core 6 and outside high-tension coil 1 inboard, resin insulating barrier is connected with square ring 7 in two ends about in the of 3 between high-voltage coil and low-voltage coil, and above structure consists of resin-insulated dry power transformer coil single piece.

As shown in Figure 1, the cast of the upper/lower terminal of resin insulating barrier 3 is connected with the square ring 7 of the vertical evagination of curing between high-voltage coil and low-voltage coil, according to the different line magnitude of voltage that in high-tension coil 1, applies, the square ring of annular about in the of 7 two ends stretch out the height d be respectively line voltage: under 10 kilovolts, the d=15 millimeter; Under 20 kilovolts, the d=35 millimeter; Under 35 kilovolts, the d=55 millimeter.

Under the different high-voltage line astragal magnitudes of voltage between high-voltage coil and low-voltage coil the thickness of resin insulating barrier 3 be respectively: under 10 kilovolts, be 8 millimeters; Under 20 kilovolts, it is 12 millimeters; Under 35 kilovolts, it is 18 millimeters.

If at the resin insulating barrier between high-voltage coil and low-voltage coil of not annotating between high-voltage coil and low-voltage coil, then the air clearance between high-tension coil and the low-voltage coil is large, high-voltage line astragal voltage is respectively: under 10 kilovolts, above-mentioned air clearance is from being: 35～40 millimeters; Under 20 kilovolts, air clearance is: 55～60 millimeters, under 35 kilovolts, air clearance is: 80～85 millimeters.

Apply in high-tension coil 1 under 10 kilovolts to 35 kilovolts the line magnitude of voltage, the range of values of thickness of resin insulating barrier 3 is between high-voltage coil and low-voltage coil: 8 millimeters to 18 millimeters.

Claims

1. resin-insulated dry power transformer coil, by high-tension coil (1), resin insulating barrier between high-voltage coil and low-voltage coil (3), low-voltage coil (4), transformer core (6) and square ring (7) form, it is characterized in that in high-tension coil (1), having heat radiation air flue (2) in the high-tension coil, heat radiation air flue (5) in the low-voltage coil is arranged in low-voltage coil (4), be cast with resin insulating barrier (3) between the high-voltage coil and low-voltage coil of one deck curing between low-voltage coil (4) outside being sleeved on transformer core (6) outside and outside high-tension coil (1) inboard, resin insulating barrier between high-voltage coil and low-voltage coil (3) up and down two ends is connected with square ring (7), and above structure consists of resin-insulated dry power transformer coil single piece.

2. a kind of resin-insulated dry power transformer coil according to claim 1, it is characterized in that the upper/lower terminal cast of resin insulating barrier between high-voltage coil and low-voltage coil (3) is connected with the square ring (7) of the vertical evagination of curing, according to the different line magnitude of voltage that in high-tension coil (1), applies, the square ring of annular (7) up and down two ends stretch out the height d be respectively line voltage: under 10 kilovolts, the d=15 millimeter; Under 20 kilovolts, the d=35 millimeter; Under 35 kilovolts, the d=55 millimeter.

3. a kind of resin-insulated dry power transformer coil according to claim 1, it is characterized in that applying in high-tension coil (1) under 10 kilovolts to 35 kilovolts the line magnitude of voltage, the range of values of thickness of resin insulating barrier between high-voltage coil and low-voltage coil (3) is: 8 millimeters to 18 millimeters.