Internal oil guide structure of transformer body of high-capacity power plant

Abstract

The utility model discloses an internal oil guide structure of a transformer body of a high-capacity power plant, which comprises a clamping piece, a step cushion block, a compression ring, a matched cushion block, a high-voltage winding and a low-voltage winding, the clamping piece, the step cushion block, the compression ring and the matched cushion block are sequentially arranged from bottom to top, and the high-voltage winding is arranged on the outer side of the low-voltage winding. The plurality of equally-matched cushion blocks are annularly and uniformly distributed below a bottom end ring of the high-voltage winding, the stepped cushion blocks and the pressing rings are circular ring pieces, a plurality of oil inlet holes are annularly formed in the stepped cushion blocks, a plurality of oil flowing holes are annularly formed in the pressing rings, the oil inlet holes and the oil flowing holes are communicated in a one-to-one correspondence mode, and the oil flowing holes are correspondingly formed between every two adjacent equally-matched cushion blocks; the high-voltage winding and the low-voltage winding are uniformly distributed and effectively buffered by cooling oil by arranging the oil inlet holes and the oil flowing holes which are uniformly distributed and equivalently arranging the cushion blocks, so that the oil flow distribution is more uniform, the electrification of the oil flow is obviously reduced, the resistance and turbulence of the oil flow are reduced, and the high-voltage winding is simple in structure, easy to implement and wide in applicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer heat dissipation technical field, concretely relates to a large capacity power plant transformer body internal oil guide structure. BACKGROUND

[0002] With the development of power system, large capacity power plant transformer is increasingly widely used in power grid. However, in the process of transformer operation, oil flow electrification phenomenon has been one of the important factors affecting the safe and stable operation of transformer. Oil flow electrification not only can cause partial discharge, but also can cause transformer insulation breakdown, and even cause transformer damage. Therefore, optimizing the oil flow distribution in the transformer, reducing the oil flow electrification phenomenon, becomes the key to improve the stability and safety of transformer operation.

[0003] In the traditional design, in order to prevent oil flow electrification, the oil flow channel is usually limited. However, this method has obvious disadvantages: too small opening is easy to cause oil flow speed too fast, increase flow resistance, affect the heat dissipation effect; too large opening may cause insufficient oil flow, also affect the heat dissipation performance of transformer. In addition, with the continuous increase of transformer capacity, its requirement for oil flow distribution is also higher and higher, and the traditional design has been unable to meet the demand of preventing oil flow electrification and ensuring heat dissipation performance in large capacity transformer at the same time.

[0004] In view of the above defects, the utility model creator finally obtains the utility model after long time research and practice. UTILITY MODEL CONTENT

[0005] In order to solve the above technical defects, the utility model adopts the technical scheme that provides a large capacity power plant transformer body internal oil guide structure, which comprises a clamp, a stepped pad, a compression ring, an equal distribution pad, a high voltage winding and a low voltage winding. The clamp, the stepped pad, the compression ring and the equal distribution pad are arranged in sequence from bottom to top. The high voltage winding is arranged outside the low voltage winding. A plurality of equal distribution pads are annularly and uniformly distributed below the bottom end ring of the high voltage winding. The stepped pad is arranged as a circular ring. A plurality of oil inlet holes are annularly arranged on the stepped pad. The compression ring is arranged as a circular ring. A plurality of oil flow holes are annularly arranged on the compression ring. The oil inlet holes and the oil flow holes are one-to-one corresponding and connected. The oil flow holes are arranged between adjacent two equal distribution pads.

[0006] Preferably, the high voltage winding comprises a high voltage inner insulation cylinder and a high voltage outer insulation cylinder. The high voltage inner insulation cylinder is arranged on the bottom end ring of the high voltage winding through a sleeve plate. The high voltage outer insulation cylinder is arranged on the compression ring. The high voltage inner insulation cylinder is arranged in the high voltage outer insulation cylinder. The high voltage inner insulation cylinder and the high voltage outer insulation cylinder are provided with high voltage group coils. The high voltage inner insulation cylinder and the high voltage outer insulation cylinder are both provided with oil blocking corrugated plates at the bottom.

[0007] Preferably, the high-voltage group coil is provided with support bars on both inner and outer sides in the axial direction to contact and abut against the high-voltage inner insulation cylinder and the high-voltage outer insulation cylinder, respectively.

[0008] Preferably, the lower part of the high-voltage winding and the low-voltage winding is provided with a radially extending horizontal oil passage.

[0009] Preferably, the high-voltage winding is provided with an oil baffle, which is in contact with the high-voltage outer insulation cylinder and not in contact with the high-voltage inner insulation cylinder.

[0010] Preferably, the oil inlet hole, the oil outlet hole, the equal-distribution pad and the horizontal oil passage end edge are all provided with a circular arc chamfer.

[0011] Preferably, the oil inlet hole comprises an oil inlet section, an oil passage section and an oil outlet section, the oil inlet section is communicated through the oil passage section and the oil outlet section, the oil outlet section is provided corresponding to the oil outlet hole, and the cross-sectional diameter of the oil inlet section is smaller than that of the oil outlet section.

[0012] Preferably, the oil passage section is provided in a horn type structure with the cross-sectional diameter gradually increasing from the oil inlet section to the oil outlet section.

[0013] Preferably, the stepped pad comprises a plurality of pad layers stacked from bottom to top, at least one of the pad layers is provided with the oil inlet section, at least one of the pad layers is provided with the oil passage section, and at least one of the pad layers is provided with the oil outlet section.

[0014] Preferably, the oil passage section extends obliquely from the oil inlet section to the oil outlet section.

[0015] Compared with the prior art, the utility model has the beneficial effects that: the utility model discloses through setting the oil inlet hole and the oil outlet hole, and through the equal-distribution pad, the uniform distribution and effective buffering of the cooling oil to the high-voltage winding and the low-voltage winding are realized, the oil flow distribution is more uniform, the oil flow electrification is reduced significantly, the oil flow resistance and turbulence are reduced, and the utility model has simple structure, easy implementation and wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the connection structure schematic view of the clamp, the stepped pad and the compression ring;

[0017] Figure 2 It is the connection structure schematic view of the compression ring, the equal-distribution pad, the high-voltage winding and the low-voltage winding;

[0018] Figure 3 It is the structure top view of the compression ring and the equal-distribution pad.

[0019] Figures show:

[0020] 1-clip; 2-step pad; 3-press ring; 4-equal pad; 5-high voltage winding; 6-low voltage winding; 21-oil inlet hole; 31-oil flow hole; 51-bottom end ring; 52-high voltage inner insulation cylinder; 53-high voltage outer insulation cylinder; 54-sleeve plate; 55-oil blocking corrugation; 56-supporting strut; 57-horizontal oil path; 58-oil blocking plate; 211-oil inlet section; 212-oil passing section; 213-oil outlet section; 214-cushion layer. DETAILED DESCRIPTION

[0021] The above and other technical features and advantages of the present application will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.

[0022] Example One

[0023] As shown in Figure 1 , Figure 2 and Figure 3 , Figure 1 is a schematic view of the connection structure of the clip, the step pad and the press ring; Figure 2 is a schematic view of the connection structure of the press ring, the equal pad, the high voltage winding and the low voltage winding; Figure 3 is a top view of the structure of the press ring and the equal pad.

[0024] The internal oil guiding structure of the large-capacity power plant transformer body comprises a clip 1, a step pad 2, a press ring 3, an equal pad 4, a high voltage winding 5 and a low voltage winding 6, wherein the clip 1, the step pad 2, the press ring 3 and the equal pad 4 are sequentially arranged from bottom to top, the clip 1 realizes clamping and fixing of the internal components, the high voltage winding 5 is arranged on the outer side of the low voltage winding 6, a plurality of equal pads 4 are annularly and uniformly arranged below the bottom end ring 51 of the high voltage winding 5 to support the high voltage winding 5, the step pad 2 is arranged as a circular ring, a plurality of oil inlet holes 21 are annularly arranged on the step pad 2, correspondingly, the press ring 3 is arranged as a circular ring, a plurality of oil flow holes 31 are annularly arranged on the press ring 3, the oil inlet holes 21 and the oil flow holes 31 are one-to-one correspondingly arranged and communicated, and the oil flow holes 31 are correspondingly arranged between adjacent two equal pads 4.

[0025] The cooling oil flows from the oil inlet holes 21 to the bottom of the high voltage winding 5 through the oil flow holes 31, a radial extension shunt channel is formed between adjacent two equal pads 4, the cooling oil flows to the low voltage winding 6 in the radial inward direction to cool the low voltage winding 6, and flows to the high voltage winding 5 in the radial outward direction to cool the high voltage winding 5.

[0026] Preferably, the high-voltage winding 5 comprises a high-voltage inner insulation cylinder 52 and a high-voltage outer insulation cylinder 53, the high-voltage inner insulation cylinder 52 is arranged on the bottom end ring 51 of the high-voltage winding 5 through a sleeve plate 54, the high-voltage outer insulation cylinder 53 is arranged on the pressure ring 3, the high-voltage inner insulation cylinder 52 is arranged in the high-voltage outer insulation cylinder 53, and the high-voltage inner insulation cylinder 52 and the high-voltage outer insulation cylinder 53 are provided with high-voltage group coils, and the bottom of the high-voltage inner insulation cylinder 52 and the high-voltage outer insulation cylinder 53 is provided with an oil blocking corrugated plate 55.

[0027] The high-voltage group coils are axially provided with support struts 56 on the inner and outer sides to respectively contact and abut against the high-voltage inner insulation cylinder 52 and the high-voltage outer insulation cylinder 53 to ensure the structural stability of the high-voltage group coils, and meanwhile, the axially extending support struts 56 form an axial oil flow channel to realize the downward-to-upward flow of the cooling oil.

[0028] The lower part of the high-voltage winding 5 and the low-voltage winding 6 is provided with a radially extending horizontal oil passage 57, and the cooling oil can flow from the outer side to the corresponding inner side of the high-voltage winding 5 or the low-voltage winding 6 through the horizontal oil passage 57 to realize the uniform distribution of oil flow and avoid the problems of too fast or too slow local oil flow, thereby improving the heat dissipation efficiency.

[0029] Specifically, in the high-voltage winding 5, the cooling oil flows radially outward after flowing out of the oil flow hole 31, flows upward to the gap between the high-voltage outer insulation cylinder 53 and the high-voltage group coil through the blocking of the oil blocking corrugated plate 55, and flows to the gap between the high-voltage inner insulation cylinder 52 and the high-voltage group coil through the horizontal oil passage 57, and the flow rate control effectively prevents the occurrence of oil flow electrification, thereby improving the insulation performance and operation safety of the transformer.

[0030] Preferably, the high-voltage winding 5 is provided with an oil blocking plate 58, the oil blocking plate 58 is arranged in contact with the high-voltage outer insulation cylinder 53 and does not contact the high-voltage inner insulation cylinder 52, so that the cooling oil can be blocked in the gap between the high-voltage outer insulation cylinder 53 and the high-voltage group coil, and the cooling oil flows to the horizontal oil passage 57, thereby also buffering the oil flow and preventing oil flow electrification.

[0031] Generally, the oil inlet hole 21, the oil flow hole 31, the equalizing pad 4, and the end edge of the horizontal oil passage 57 are all provided with a circular arc chamfer to reduce the oil flow resistance and turbulence phenomenon.

[0032] The utility model discloses a uniform distribution of the oil inlet hole 21 and the oil flow hole 31 is set up, and the equal distribution pad 4 is used to realize the uniform distribution and effective buffering of the cooling oil to the high voltage winding 5 and the low voltage winding 6, make oil flow distribution more uniform, significantly reduce oil flow electrification, reduce oil flow resistance and turbulence, and the structure is simple, easy to implement, and has wide applicability.

[0033] Example two

[0034] The oil inlet hole 21 includes an oil inlet section 211, an oil passing section 212 and an oil outlet section 213, the oil inlet section 211 is communicated through the oil passing section 212 and the oil outlet section 213, the oil outlet section 213 is set corresponding to the oil flow hole 31, the cross section diameter of the oil inlet section 211 is less than the cross section diameter of the oil outlet section 213, thereby forming the structure that the oil inlet diameter is small and the oil outlet diameter is large, to reduce the oil flow velocity.

[0035] Preferably, the oil passing section 212 is set as the horn type structure that the cross section diameter gradually increases from the oil inlet section 211 to the oil outlet section 213, thereby realizing the smooth transition from the oil inlet section 211 to the oil outlet section 213.

[0036] In specific embodiments, the stepped pad 2 includes a plurality of pad layers 214 stacked from bottom to top, the inner wall of the bottom pad layer 214 needs to abut against the parts of the transformer to ensure the overall position stability of the stepped pad 2, thereby ensuring the position correspondence accuracy of the oil inlet hole 21 and the oil flow hole 31, and the upper pad layer 214 needs to avoid the parts of the transformer to provide installation space for the parts of the transformer, so the stepped pad 2 as a whole has a stepped structure, in this case, the oil passing section 212 can be inclined to realize the transition from the oil inlet section 211 to the oil outlet section 213.

[0037] Generally, the oil inlet section 211 is arranged on at least one pad layer 214, the oil passing section 212 is arranged on at least one pad layer 214, and the oil outlet section 213 is arranged on at least one pad layer 214, thereby facilitating the machining of the oil inlet hole 21 on the stepped pad 2.

[0038] It is worth pointing out that the stepped pad 2 can also be set as an integral structure, and the oil inlet hole 21 is machined as a whole on the stepped pad 2.

[0039] The above only describes the preferred embodiments of the utility model, which is only illustrative but not limiting for the utility model. The skilled person understands that many changes, modifications and even equivalents can be made to the utility model within the spirit and scope defined by the claims of the utility model, but all will fall within the protection scope of the utility model.

Claims

1. A large-capacity power plant transformer body internal oil guiding structure, characterized by, The device comprises a clamp, a stepped spacer, a compression ring, an equal-distribution spacer, a high-voltage winding and a low-voltage winding, the clamp, the stepped spacer and the compression ring are sequentially arranged from bottom to top, the high-voltage winding is arranged outside the low-voltage winding, a plurality of equal-distribution spacers are annularly and uniformly arranged below the bottom end ring of the high-voltage winding, the stepped spacer is arranged as a circular ring, a plurality of oil inlet holes are annularly arranged on the stepped spacer, the compression ring is arranged as a circular ring, a plurality of oil flow holes are annularly arranged on the compression ring, the oil inlet holes and the oil flow holes are one-to-one correspondingly arranged and communicated, and the oil flow holes are correspondingly arranged between two adjacent equal-distribution spacers.

2. The oil guide structure inside the transformer body of a large capacity power plant according to claim 1, wherein The high-voltage winding comprises a high-voltage inner insulation cylinder and a high-voltage outer insulation cylinder, the high-voltage inner insulation cylinder is arranged on the bottom end ring of the high-voltage winding through a sleeve plate, the high-voltage outer insulation cylinder is arranged on the compression ring, the high-voltage inner insulation cylinder is arranged in the high-voltage outer insulation cylinder, the high-voltage inner insulation cylinder and the high-voltage outer insulation cylinder are provided with high-voltage group coils, and the high-voltage inner insulation cylinder and the high-voltage outer insulation cylinder are both provided with oil blocking corrugations at the bottom.

3. The oil guide structure inside the transformer body of a large capacity power plant according to claim 2, wherein Supporting struts are axially arranged on the inner and outer sides of the high-voltage group coils to respectively contact and abut against the high-voltage inner insulation cylinder and the high-voltage outer insulation cylinder.

4. The oil guide structure inside the transformer body of a large capacity power plant according to claim 3, wherein The lower parts of the high-voltage winding and the low-voltage winding are both provided with radially extending horizontal oil channels.

5. The oil guide structure inside the transformer body of a large capacity power plant according to claim 4, wherein An oil blocking plate is arranged in the high-voltage winding, the oil blocking plate is arranged in contact with the high-voltage outer insulation cylinder and not in contact with the high-voltage inner insulation cylinder.

6. The oil guide structure inside the transformer body of a large capacity power plant according to claim 5, wherein The end edges of the oil inlet holes, the oil flow holes, the equal-distribution spacers and the horizontal oil channels are all arranged as circular arc chamfers.

7. The oil guide structure inside the transformer body of a large capacity power plant according to claim 1, wherein The oil inlet hole comprises an oil inlet section, an oil passing section and an oil outlet section, the oil inlet section is communicated through the oil passing section and the oil outlet section, the oil outlet section is arranged corresponding to the oil flow hole, and the cross-sectional diameter of the oil inlet section is smaller than that of the oil outlet section.

8. The oil guide structure inside the transformer body of a large capacity power plant according to claim 7, wherein The oil passing section is arranged as a horn-shaped structure with the cross-sectional diameter gradually increasing from the oil inlet section to the oil outlet section.

9. The oil guide structure inside the transformer body of a large capacity power plant according to claim 7, wherein The stepped spacer comprises a plurality of spacer layers stacked from bottom to top, at least one of the spacer layers is provided with the oil inlet section, at least one of the spacer layers is provided with the oil passing section, and at least one of the spacer layers is provided with the oil outlet section.

10. The oil guide structure inside the transformer body of a large capacity power plant according to claim 9, wherein The oil passing section is inclinedly extended from the oil inlet section to the oil outlet section.

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