CN115863025A - Oil-immersed generator transformer - Google Patents
Oil-immersed generator transformer Download PDFInfo
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Abstract
The application relates to an oil-immersed generator transformer, including the ware body in oil tank and the oil tank, the ware body includes iron core and voltage regulating winding, and voltage regulating winding includes: the transformer comprises a core, a first lead and a second lead, wherein the first lead and the second lead are wound around the core, each lead is wound into N multiplied by M turns, the output end of the ith multiplied by M turn of the first lead is connected to the input end of the (i-1) multiplied by M +1 turn of the second lead, the output end of the ith multiplied by M turn of the second lead is connected to the input end of the ith multiplied by M +1 turn of the second lead, the output end of the (i + 1) multiplied by M turn of the second lead is connected to the input end of the ith multiplied by M +1 turn of the first lead, the output end of the (i + 1) multiplied by M turn of the first lead is connected to the input end of the (i + 1) multiplied by M +1 turn of the first lead, M, N is a positive integer, N > 1,i is an odd number, i < N, a plurality of cushion blocks are arranged between two adjacent turns, and gaps exist between the two adjacent cushion blocks to achieve the effects of optimizing the heat dissipation and the volume of the transformer.
Description
Technical Field
The present application relates to the field of transformers, and more particularly, to an oil-immersed generator transformer with an improved structure.
Background
The generator transformer is a power transformer for the generator. Typically, to transfer the power generated by the generator, the low voltage or input side of the generator transformer is connected to the generator to receive low voltage power input, while the high voltage or output side of the generator transformer is connected to a transmission line (e.g., a transmission line of a power grid) to output the converted high voltage power. Because the generator of the power plant usually has a large capacity, an oil-immersed generator transformer is usually adopted to adapt to the characteristic of the large capacity. The oil immersed generator transformer is a power transformer using transformer oil as a cooling and insulating medium. The oil immersed generator transformer mainly comprises a transformer body (comprising an iron core, a winding and an insulation structure), an oil tank, a cooling device, a protection device, a voltage regulating device (comprising a tapping switch), a wire outlet device (comprising an insulation sleeve) and the like. The oil tank is used as the shell of the transformer, the transformer body is positioned in the oil tank, and transformer oil is filled between the transformer body and the oil tank.
Because of the operating characteristics of the generator, the generator transformer needs to operate at near full capacity for a long period of time. Therefore, the temperature (i.e., temperature rise) of the generator transformer is a very important factor. The temperature rise affects the insulation material, which ages the insulation material and further affects the life of the generator transformer. In particular, the regulating winding on the high-voltage side of the generator transformer influences the temperature rise of the generator transformer. At present, for a large-capacity oil-immersed generator transformer, a cake winding or a layer winding is adopted for a voltage regulating winding. When a layered winding is used, the voltage regulating winding needs to bear a larger capacity at the highest voltage gear (i.e. when the voltage regulating winding is all connected to the high-voltage side circuit). At this time, the heat dissipation of the voltage regulating winding is poor, which causes the temperature of the transformer to rise. When the cake-type winding is adopted, in order to improve the utilization rate of an iron core window, the occupied height of a single-turn wire is relatively high, but the transverse eddy current loss is large, and the hot point temperature rise of the winding is high. Since the height of the single-turn wire cannot be too high, the radial dimension of the winding needs to be increased to meet the requirements of the wire section, which in turn causes the iron core loss and the iron core cost to rise. Therefore, the current voltage regulating winding cannot well meet the balance of loss, temperature rise and cost. That is, the temperature rise of the current oil-immersed generator transformer needs to be optimized.
In addition, the transformer oil tank needs to provide a sufficient wire outlet space for the low-voltage side large-current lead, so that the current tank cover of the transformer oil tank usually adopts a sloping top tank cover or a flat top tank cover to provide a larger wire outlet space for the low-voltage side large-current lead. Fig. 1 is a schematic structural view of a tank 110' of a conventional transformer using a tank cover 111' of a conventional transformer having an inclined ceiling and a tank 113' of a conventional transformer. As shown in fig. 1, the low-side large-current lead is led out from the slope of the tank cover 111 'of the conventional transformer in the direction indicated by the arrow to enter the low-voltage rising seat 130' of the conventional transformer. In order to provide a sufficient outlet space for the low-voltage side large current lead, the inclined surface of the case cover 111' of the pitched-top conventional transformer is configured to have a large sectional area. Because the larger inclined plane is arranged, the tank body of the oil tank connected with the bottom end of the inclined plane also has larger sectional area (or width), thereby leading the volume of the tank body to be larger. Moreover, the conventional transformer also provides a large space by using a slanted top box cover or a flat top box cover to prevent leakage flux of the winding coil in the transformer body from entering the box cover to cause loss of the box cover. The tank cover structure causes the whole volume of the oil tank to be larger, the space utilization rate to be low and transformer oil to be wasted.
In addition, the flow rate of oil in the transformer body needs to be controlled within a reasonable range. The heat dissipation effect of the body is not good when the oil flow rate is too low, and the oil flow rate is easily electrified when the oil flow rate is too high. The current mode for slowing down the flow velocity of oil in the transformer body is as follows: the flow rate of the transformer oil is slowed down by increasing the space from the bottom of the winding coil to the lower iron yoke. However, such a design may result in a larger distance between the winding and the lower iron yoke, i.e., an increased space for the transformer body, and thus a larger volume of the generator transformer.
In addition, as shown in fig. 1, the low voltage rising base 130 'of the conventional transformer generally employs a protruding flange 131' (i.e., a flange is located on an upper surface of the low voltage rising base 130 'of the conventional transformer), and since the protruding flange 131' of the conventional transformer is not immersed in transformer oil but exposed to air, the flange has low heat dissipation efficiency and is easily overheated. For example, in the patent application with the publication number CN111540568a, although the low-voltage large-current lifting seat adopts a flow guide structure and is internally provided with the reinforcing ribs and the radiating fins, the optimization of an oil flow path in the low-voltage lifting seat is realized, and the cooling effect of the low-voltage lifting seat is improved; however, the above patent application does not address the flange portion of the low pressure rise seat, resulting in a flange exposed to air that is susceptible to local overheating.
Therefore, there is a need for an improved oil immersed generator transformer that can have optimized temperature rise and heat dissipation to slow down insulation aging of the transformer, extend the life of the transformer, and can also have reduced volume to reduce the cost of the transformer.
Disclosure of Invention
The present application is proposed in view of the above problems, and a main object of the present application is to provide an oil-immersed generator transformer with an improved structure, so as to solve at least the technical problems in the prior art that it is difficult to slow down insulation aging of the oil-immersed generator transformer, to reduce the volume of the oil-immersed generator, and to reduce the cost of the oil-immersed generator.
In order to achieve the above object, according to one aspect of the present application, there is provided an oil-immersed generator transformer, including an oil tank and a transformer body located in the oil tank, the transformer body including an iron core and a voltage regulating winding, wherein the voltage regulating winding includes: first and second wires wound around the core in a parallel-wound manner, each wire being wound into a coil of N × M turns, wherein an output end of the coil of the i × M turn of the first wire is connected to an input end of the coil of the (i-1) × M +1 turn of the second wire, an output end of the coil of the i × M turn of the second wire is connected to an input end of the coil of the i × M +1 turn of the second wire, an output end of the coil of the (i + 1) × M turn of the second wire is connected to an input end of the coil of the i × M +1 turn of the first wire, an output end of the coil of the (i + 1) × M +1 turn of the first wire is connected to an input end of the coil of the (i + 1) × M +1 turn of the first wire, M, N is a positive integer, N > 1,i is an odd number and i < N, and wherein a plurality of turns are arranged between any adjacent two turns, and a spacer is provided between the adjacent two.
In this way, the limited connection mode of the voltage regulating windings can reduce the eddy current loss of the voltage regulating windings, and the interval formed by the plurality of cushion blocks enables the adjacent coils of the voltage regulating windings to be not required to be tightly arranged, so that the heat dissipation efficiency of the coils of the voltage regulating windings is improved. Further, the gap existing between the two adjacent cushion blocks enables the transformer oil to be injected into the gap. Through the transformer oil injected into the gaps, the heat dissipation efficiency of the coil can be further improved, and further the heat dissipation efficiency of the voltage regulating winding is improved, so that the temperature rise of the transformer is improved, the insulation aging of the transformer is slowed down, and the service life of the transformer is prolonged.
Further, according to an embodiment of the present application, the spacer is made of an insulating material and has a rectangular parallelepiped shape.
In this way, the spacers can support a sufficient space for adjacent coils while ensuring insulation between winding coils.
Further, according to one embodiment of the present application, M corresponds to the preset adjustment fineness of the voltage of the regulating winding, and 2N +1 corresponds to the number of stages of voltage adjustment that the regulating winding can perform.
In this way, it is possible to set the number of winding turns of the wire and the number of taps (which is equal to the number of stages of voltage adjustment) according to the required fineness of adjustment of the voltage of the regulator winding and the number of stages of voltage adjustment that the regulator winding can perform.
Further, according to an embodiment of the present application, an output end of the i × M turn coil of the first wire and an input end of the (i-1) × M +1 turn coil of the second wire are connected to the first tap, an output end of the i × M turn coil of the second wire and an input end of the i × M +1 turn coil of the second wire are connected to the second tap, an output end of the (i + 1) × M turn coil of the second wire and an input end of the i × M +1 turn coil of the first wire are connected to the third tap, and an output end of the (i + 1) × M turn coil of the first wire and an input end of the (i + 1) × M +1 turn coil of the first wire are connected to the fourth tap.
In this way, the voltage regulating winding coil adopts a staggered lead-out tap mode, so that a tap is led out every M turns of the coil, and the adjustment fineness of M corresponding to the preset voltage of the voltage regulating winding is realized.
Further, according to an embodiment of the present application, the oil tank includes a tank cover and a tank body, a first magnetic shield is provided on an inner wall of the tank body and a second magnetic shield is provided on an inner wall of the tank cover, wherein the second magnetic shield is disposed on the inner wall of the tank cover at a position adjacent to the first magnetic shield and extends in a direction in which the cores in the body are arranged, and the second magnetic shield extends over a length of the body in the direction.
In this way, the arranged second magnetic shield can absorb leakage flux generated from the winding coil of the transformer, which is not absorbed by the first magnetic shield. Moreover, since the length of the second magnetic shield exceeds the length of the body of the transformer (thereby covering the leakage flux region), the presence of the second magnetic shield can close the leakage flux of the coil, i.e., avoid leakage of the leakage flux.
Further, according to an embodiment of the present application, the number of the second magnetic shields is two, and the two second magnetic shields are arranged symmetrically with respect to the center axis of the fuel tank.
In this way, the two second magnetic shields arranged can absorb leakage flux generated from the winding coil of the transformer from both the left and right sides.
Further, according to an embodiment of the present application, the cover of the fuel tank has a mushroom head shape formed by cutting four corners from a rectangle, the mushroom head shape being such that the second magnetic shield on the inner wall of the cover is arranged at an obtuse angle to the first magnetic shield on the inner wall of the case body.
In this way, the second magnetic shield can collect to the maximum extent the leakage flux generated by the winding coil of the transformer which is not absorbed by the first magnetic shield.
Further, according to an embodiment of this application, the bottom of ware body is provided with the entry of oil-immersed generator transformer's transformer oil, wherein, is provided with the unhurried current structure apart from entry predetermined height department in the ware body, and the unhurried current structure includes first unhurried current portion and the second unhurried current portion that is located first unhurried current portion top, and first unhurried current portion is the U-shaped, and the opening of U-shaped faces the entry of transformer oil, and second unhurried current portion includes tubulose oil circuit and the oil-retaining return circuit above the tubulose oil circuit.
In this way, by using the combination of the first U-shaped flow slowing portion and the second flow slowing portion comprising the tubular oil passage thereon, the flow speed of the transformer oil entering the transformer body can be slowed down to a proper range, so that the electrification of the oil flow caused by the over-high oil flow speed is avoided while the heat dissipation efficiency of the transformer oil on the winding coil is ensured.
Further, according to an embodiment of the present application, the number of the first relief portions is plural, the plural first relief portions are arranged one at a predetermined distance in a direction surrounding the core, and wherein the second relief portions are continuous in the direction surrounding the core.
In this way, a part of the transformer oil entering the vessel body is blocked by the first flow delaying portions to slow down the flow rate, and the remaining part of the transformer oil flowing upward through the gaps between the plurality of first flow delaying portions, which is not blocked by the first flow delaying portions, is slowed down by the second flow delaying portions, whereby the flow rate of the transformer oil can be slowed down to an appropriate range.
Further, according to an embodiment of the present application, the body further includes a low voltage winding, a high voltage winding, and an insulation structure between adjacent windings, and the slow current structure is located at a bottom of the insulation structure between the low voltage winding and the high voltage winding.
In this way, the arrangement of the current-slowing structure does not increase the volume of the transformer body, and thus does not increase the volume of the transformer.
Further, according to an embodiment of the present application, the oil-immersed generator transformer further includes a low-voltage rising seat for leading out a low-voltage side lead, a sinking flange for connecting a low-voltage bushing is arranged in the low-voltage rising seat, and the sinking flange is located below an upper surface of the low-voltage rising seat, so that the sinking flange can be immersed in transformer oil of the oil-immersed generator transformer.
In this way, the flange can be immersed in the transformer oil of the oil-immersed generator transformer, thereby improving the heat dissipation of the flange and avoiding local overheating of the low-voltage rising base.
In this application embodiment, provide an oil-immersed generator transformer, include the oil tank and be located the ware body of oil tank, the ware body includes iron core and voltage regulating winding, and voltage regulating winding includes: the insulation transformer comprises a first lead and a second lead, wherein the first lead and the second lead are wound around an iron core in a parallel winding mode, each lead is wound into a coil with N multiplied by M turns, the output end of the coil with the ith multiplied by M turns of the first lead is connected to the input end of the coil with the (i-1) multiplied by M +1 turns of the second lead, the output end of the coil with the ith multiplied by M +1 turns of the second lead is connected to the input end of the coil with the ith multiplied by M +1 turns of the second lead, the output end of the coil with the (i + 1) multiplied by M +1 turns of the second lead is connected to the input end of the coil with the (i + 1) multiplied by M +1 turns of the first lead, M, N is a positive integer, the coil with N > 1,i is an odd number and i < N, a plurality of spacers are arranged between any two adjacent coils, and gaps exist between the two adjacent spacers, so that the problems that the insulation transformer in the prior art is difficult to reduce the temperature rise of the insulation transformer, the volume of the insulation transformer, the generator, the volume of the insulation transformer, the generator and the volume of the insulation transformer are difficult to reduce the cost of the transformer, and the aging of the insulation transformer are reduced, and the aging of the transformer are reduced, and the volume of the insulation transformer is difficult to reduce the cost of the transformer.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application, and the description of the exemplary embodiments and illustrations of the application are intended to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic view of a tank of a conventional transformer using a pitched-roof tank cap;
fig. 2 is a schematic diagram of an overall structure of an oil-immersed generator transformer according to an embodiment of the application;
fig. 3 is a connection schematic diagram of a regulating winding of an oil-immersed generator transformer according to an embodiment of the application;
fig. 4 is a partial cross-sectional view of a body of an oil filled generator transformer according to an embodiment of the present application; and
fig. 5 is an enlarged view of a partial region X of the oil filled generator transformer according to the embodiment of the application shown in fig. 2.
Wherein the figures include the following reference numerals:
110': oil tank of traditional transformer
111': case cover of traditional transformer
113': box body of traditional transformer
130': low-voltage rising seat of traditional transformer
131': protruded flange of traditional transformer
100: oil-immersed generator transformer
110: oil tank
111: box cover
113: box body
115: first magnetic shield
117: second magnetic shield
120: body of transformer
121: voltage regulating winding
123: flow slowing structure
1231: the first flow slowing part
1233: second flow slowing part
125: low-voltage winding
127: high-voltage winding
130: low-pressure lifting seat
131: sinking type flange
140: cushion block
A: first conductive line
B: second conductive line
CO: iron core
Detailed Description
In order to avoid conflict, the embodiments and features of the embodiments of the present application may be combined with each other. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In this application, where the contrary is not intended, directional words such as "upper, lower, top and bottom" are generally used with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, vertical or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the application.
An object of the application is to provide an oil-immersed generator transformer with improved structure to make the transformer have optimized temperature rise and heat dissipation, volume that reduces, thereby slow down the insulating ageing of transformer, prolong the life-span of transformer, reduce the cost of transformer simultaneously.
Fig. 2 is an overall structural schematic diagram of an oil-immersed generator transformer according to an embodiment of the present application. As shown in fig. 2, an oil-immersed generator transformer 100 according to the present application includes an oil tank 110 and a body 120 located in the oil tank, where the body 120 includes an iron core CO, and a low-voltage winding, a high-voltage winding, a voltage regulating winding and an insulation structure between adjacent windings wound on the iron core CO.
The oil-immersed generator transformer 100 according to the application has an improved structure of a voltage regulating winding, an improved structure of an oil tank 110, an improved structure of a slow flow of transformer oil in a body 120, and an improved structure of a low-pressure lifting seat connected with a tank cover of the oil tank 110. The following description will be made one by one with reference to fig. 2 to 5.
The voltage regulating winding according to the embodiment of the application comprises: first and second wires a and B wound around the core CO in a parallel-wound manner, each wire being wound into N × M turns, wherein an output end of an i × M turn of the first wire a is connected to an input end of an (i-1) × M +1 turn of the second wire B, an output end of an i × M turn of the second wire B is connected to an input end of an i × M +1 turn of the second wire B, an output end of an (i + 1) × M turn of the second wire B is connected to an input end of an i × M +1 turn of the first wire a, an output end of an (i + 1) × M turn of the first wire a is connected to an input end of an (i + 1) × M +1 turn of the first wire a, M, N are positive integers, N > 1,i is odd and i < N, and wherein a plurality of spacers are disposed between any two adjacent coils and a plurality of spacers exist between adjacent two spacers.
The parallel winding means that the first conductor a and the second conductor B are simultaneously wound around the iron core CO in parallel, and the coils of the wound first conductor a and the wound second conductor B are parallel to each other and do not cross each other. That is, the first wire a and the second wire B are wound as a single-layer winding as a whole, the adjacent coil of any one turn coil of the first wire a is the coil of the second wire B, the adjacent coil of any one turn coil of the second wire B is the coil of the first wire a, and the coil of the first wire a and the coil of the second wire B do not overlap.
Further, an output terminal of an i × M turn coil of the first wire a and an input terminal of an (i-1) × M +1 turn coil of the second wire B are connected to the first tap, an output terminal of an i × M turn coil of the second wire B and an input terminal of an i × M +1 turn coil of the second wire B are connected to the second tap, an output terminal of an (i + 1) × M turn coil of the second wire B and an input terminal of an i × M +1 turn coil of the first wire a are connected to the third tap, and an output terminal of an (i + 1) × M turn coil of the first wire a and an input terminal of an (i + 1) × M +1 turn coil of the first wire a are connected to the fourth tap.
For the first conductive wire a and the second conductive wire B, N denotes the number of segments into which each conductive wire is divided in order to connect taps, i.e., each conductive wire is divided into N segments, and both ends of each segment of conductive wire are connected to taps. M represents the number of turns of the coil included in each segment of wire. In the total of 2 × N × M turns of the coil around which the first and second conductive wires a and B are wound, one minimum cycle unit with respect to the above-described electrical connection manner is represented from the input end of the (i-1) × M +1 turn of the coil of the first conductive wire a until the output end of the (i + 1) × M turn of the coil of the first conductive wire a in the electrical connection manner as described above. i is associated with the current minimum cycle unit being the several minimum cycle units in the total coil of the regulating winding. Specifically, the (i + 1)/2 th minimum cycle unit in the total coil of the regulator winding is represented from the input end of the (i-1) × M +1 th turn coil of the first wire a until the output end of the (i + 1) × M turn coil of the first wire a. This means that the number of values that i can take represents the number of minimum cyclic units in a 2 × N × M turn coil.
Fig. 3 is a schematic connection diagram of the voltage regulating winding 121 of the oil-immersed generator transformer 100 according to the embodiment of the present application. The regulating winding 121 is located on the high voltage side of the transformer 100 and is connected in series with the high voltage winding. Specifically, (a) of fig. 3 shows a mechanical connection schematic of the wires of the voltage regulating winding 121, and (b) of fig. 3 shows a corresponding electrical connection schematic of the wires of the voltage regulating winding 121.
As shown in fig. 3 (a), the voltage regulating winding 121 is formed by winding a parallel first conductor a and a parallel second conductor B together in a parallel manner around the core CO in a predetermined direction (clockwise or counterclockwise). Each wire is wound with the same number of turns nxm, and M, N is a positive integer, so that the voltage regulating winding 121 is composed of 2 xnxm turns of coils. In the present application, the 1 st to Nth XM-turn coils of the first wire A are denoted as A 1 ~A N×M And 1 st to Nth M-th turns of the second wire B are represented as B 1 ~B N×M . Further, in the present application, M corresponds to the preset adjustment fineness of the regulating winding 121 (i.e., the minimum adjustment voltage u0, u0 may be in a predetermined proportion to the total voltage of the transformer), and 2n +1 corresponds to the number of voltage adjustment stages that the regulating winding 121 can perform (i.e., tap)The number of (d) corresponds. That is, M, N may be set so that coil A is wound 1 ~A 1×M 、A 1×M+1 ~A 2×M 、... A (N-1)×M +1 ~A N×M 、B 1 ~B 1×M 、B 1×M+1 ~B 2×M 、... B (N-1)×M +1 ~B N×M The voltage span over is u0.
In the present application, fig. 3 shows an embodiment with M =6 and N =3, but the value of M, N is not limited thereto.
As shown in fig. 3 (B), which shows a corresponding electrical connection diagram of the first and second conductive lines a and B. Reference numeral 3~9 in fig. 3 (b) denotes 2 xn +1=7 taps of the voltage regulating winding 121, and any one of 7 taps may be used as an output terminal of the voltage regulating winding 121, which may be connected to a neutral point of a high voltage side of the transformer. The tap 3 may also serve as an input for a regulating winding 121, which may be connected to the tail end of the high voltage winding of the transformer, while the head end of the high voltage winding is connected to the grid. When the tap 3 of the regulating winding 121 serves as both the input terminal and the output terminal, the regulating winding 121 is not connected to the high voltage side of the transformer. When the tap 3 of the voltage regulating winding 121 is used as the input end and the tap 9 is used as the output end, the voltage regulating winding 121 is completely connected to the high-voltage side of the transformer, which represents the worst heat dissipation condition of the voltage regulating winding.
As shown in (a) and (B) of fig. 3, it is assumed that the tap 3 is located at the uppermost side of the voltage regulating winding, and the first and second wires a and B are wound around the core CO from top to bottom in the clockwise direction to form a total of 36 turns of the coil a 1 、B 1 、A 2 、B 2 、... A 17 、B 17 、A 18 、B 18 . Tap 3 is connected to coil A 1 Input end of, coil A 6 Is connected to the coil B 1 Input end of, coil B 6 Is connected to the coil B 7 Input end of, coil B 12 Is connected to the coil a 7 Input end of, coil A 12 Is connected to the coil a 13 Input terminal of (2), coil A 18 Is connected to the coil B 13 Input end of, coil B 18 Is connected to tap 9. In addition, the slave coil A 6 Output terminal of (2) and coil B 1 Between the input ends of which a tap 4 leads from the coil B 6 Output terminal of and coil B 7 Between the input ends of which a tap 5 leads from the coil B 12 Output terminal of (1) and coil (A) 7 Leads out a tap 6 from the coil a 12 Output terminal of (1) and coil (A) 13 Leads out a tap 7 from the input end of the coil a 18 Output terminal of (2) and coil B 13 Between the input ends of which taps 8 lead out.
In this way, coil A 1 ~A 6 Connected between taps 3 and 4, coil B 1 ~B 6 Connected between taps 4 and 5, coil B 7 ~B 12 Connected between taps 5 and 6, coil A 7 ~A 12 Connected between taps 6 and 7, coil A 13 ~A 18 Connected between taps 7 and 8, coil B 13 ~B 18 Connected between taps 8 and 9.
That is, when the tap 3 serves as an input terminal and an output terminal of the regulating winding 121, the regulating winding 121 is not inserted into the high-voltage side circuit; when the tap 3 is used as an input terminal of the voltage regulating winding 121 and the tap 4 is used as an output terminal of the voltage regulating winding 121, the coil A of the voltage regulating winding 121 1 ~A 6 The high-voltage side circuit is connected; when tap 3 is used as the input terminal of the voltage regulating winding 121 and tap 5 is used as the output terminal of the voltage regulating winding 121, the coil A of the voltage regulating winding 121 1 ~A 6 And B 1 ~B 6 The high-voltage side circuit is connected; by analogy, when tap 3 is the input of the regulator winding 121 and tap 9 is the output of the regulator winding 121, the regulator winding 121 is fully connected into the high side circuit.
In this connection, the voltage regulating winding can greatly reduce eddy current loss.
Further, as shown in fig. 3 (a), a space exists between two adjacent coils of the voltage regulating winding, and the space is supported by a spacer 140 disposed between the adjacent coils. In other words, in the voltage regulating winding, a plurality of spacers 140 are arranged between any two adjacent turns of the coil, so that a space exists between the two adjacent turns of the coil. Further, the plurality of spacers 140 are arranged along the winding direction of the coil, and a gap exists between two adjacent spacers 140. For example, the plurality of spacers 140 may be arranged one at a time at a predetermined distance (i.e., a predetermined gap) in a winding direction of the coil. In the embodiment of the present application, the spacers 140 are made of an insulating material, and each spacer 140 may have a rectangular parallelepiped shape.
In this way, the spacing formed by the plurality of spacers makes it unnecessary for two adjacent coils of the voltage regulating winding to be closely arranged, thus improving the heat dissipation efficiency of the coils of the voltage regulating winding. Further, the gap existing between the two adjacent cushion blocks enables the transformer oil to be injected into the gap. Through the transformer oil injected into the gap, the heat dissipation efficiency of the coil can be further improved, and the heat dissipation efficiency of the voltage regulating winding is further improved.
That is, with the voltage regulating winding 121 as described in fig. 3 of the present application, it is possible to increase the heat dissipation efficiency of the voltage regulating winding while reducing the eddy current loss of the voltage regulating winding, thereby reducing the temperature rise of the transformer 100 caused by the voltage regulating winding 121. The temperature rise is reduced, so that the insulation aging of the transformer is slowed down, the service life of the transformer is prolonged, and the transformer can run more safely and reliably.
Referring back to fig. 2, fig. 2 illustrates a structure of an oil tank 110 of the oil-filled generator transformer 100 according to an embodiment of the present application. As shown in fig. 2, an oil tank 110 of the transformer 100 according to an embodiment of the present application, which is a housing of the transformer 100, includes a tank cover 111 and a tank body 113. The vessel body 120 is located at the middle of the tank 113, and transformer oil serving as an insulation and cooling medium is filled between the vessel body 120 and the oil tank 110. Three-phase cores CO (i.e., three cores CO, not shown) are located in the body 120 and are arranged in a direction perpendicular to the paper.
In the present application, a first magnetic shield 115 is provided on the inner wall of the case 113 and a second magnetic shield 117 is provided on the inner wall of the case cover 111. The first magnetic shield 115 is disposed vertically along a vertical inner wall of the case 113, and the second magnetic shield 117 is disposed obliquely along an oblique inner wall of the case cover 111.
Specifically, the second magnetic shield 117 is disposed on the inner wall of the cover 111 at a position immediately adjacent to the first magnetic shield 115 and extends in the direction in which the cores CO are aligned. The second magnetic shield 117 extends over a length exceeding the length of the body 120 in this direction.
In the embodiment of the present application, the number of the first magnetic shield 115 and the second magnetic shield 117 is two each. The two first magnetic shields 115 are symmetrically arranged with respect to the central axis of the oil tank 110, and the two second magnetic shields 117 are symmetrically arranged with respect to the central axis of the oil tank 110. Since the body 120 is located at the center in the oil tank 110, that is, two first magnetic shields 115 are symmetrically arranged with respect to the body, and two second magnetic shields 117 are also symmetrically arranged with respect to the body.
That is, the oil-filled generator transformer 100 according to the present application adds two second magnetic shields 117 provided on the inner wall of the tank cover 111, compared to the conventional transformer in which only two first magnetic shields are provided on the inner wall of the tank body 113. The newly added two second magnetic shields 117 can absorb leakage flux generated from the winding coil in the body 120.
More specifically, since the length of the second magnetic shield 117 covers the leakage flux region of the coil of the transformer 100 (the three-phase coil of the transformer when the transformer 100 is a three-phase transformer), the presence of the second magnetic shield 117 can close the leakage flux of the coil (i.e., the second magnetic shield 117 absorbs the leakage flux).
The first magnetic shield 115 and the second magnetic shield 117 are each composed of a magnetic material. The magnetic material is, for example, a silicon steel sheet.
In addition, the cover 111 has a mushroom head shape (or a mushroom head shape formed by cutting two oblique corners from a pentroof cover) formed by cutting four corners from a rectangle, and the mushroom head shape makes the second magnetic shield 117 located on the inner wall of the cover 111 arranged at an obtuse angle with the first magnetic shield 115 located on the inner wall of the case 113 next to it. Since the first magnetic shield 115 is arranged in close proximity to the second magnetic shield 117 and is obtuse-angled, such second magnetic shield 117 can maximally function to collect leakage magnetic flux. Since the second magnetic shield 117 can collect the leakage flux to the maximum extent, there is no fear that the leakage flux of the winding coil in the body enters the case cover. That is, it is not necessary to provide a case cover having a large space to prevent leakage flux from entering therein. Therefore, the oil tank 110 provided with the second magnetic shield 117 can reduce the space of the tank cover 111, thereby reducing the volume of the oil tank 110.
In addition, the two inclined surfaces of the mushroom-headed case cover 111 facing upward have a large area, and therefore the mushroom-headed shape allows a sufficient wire outlet space to be reserved for the low-voltage large-current lead while reducing the width of the case cover 111 (the mushroom-headed shape corresponds to cutting off the two inclined surfaces of the pentroof case cover, thereby reducing the width compared to the pentroof case cover). Therefore, the oil tank 110 of the oil-immersed generator transformer 100 according to the embodiment of the present application adopts a structural improvement of "a combination of the mushroom-head-shaped tank cover 111 and the newly added second magnetic shield 117". By utilizing the improvement, compared with the traditional transformer using the inclined top box cover, the transformer tank maximally absorbs magnetic leakage and reduces the size of the box cover while keeping enough lead outgoing space on the low-voltage side, and further can reduce the width/size of the box body connected with the box cover, thereby reducing the whole volume of the oil tank and further reducing the using amount of transformer oil. Therefore, the space utilization rate of the transformer oil tank can be improved, and the cost can be saved.
Fig. 4 is a partial sectional view of the body 120 of the oil-immersed generator transformer 100 according to the embodiment of the present application, along the radial direction of the core CO. Fig. 4 shows a low voltage winding 125 located at the left side of the body 120, a high voltage winding 127 located at the center of the body 120, a regulator winding 121 located at the right side of the body 120, and an insulation structure located between adjacent windings. A ferrite core CO (not shown) is located on the left side of the low voltage winding 125. The insulating structure is made of an insulating material to achieve insulation between adjacent windings. A flow slowing structure 123 for transformer oil is also arranged in the body 120.
As shown in fig. 4, the bottom of the body 120 of the transformer 100 is provided with two inlets for transformer oil (as indicated by the two bottom arrows). The transformer oil enters the body 120 through the inlet and may flow upward and then left-right to reach the winding area and cool the winding coil.
When the flow rate of the transformer oil in the transformer body 120 is too low, the heat dissipation effect of the windings in the transformer body is poor; when the flow rate of the transformer oil in the body 120 is too high, the oil is easily electrified, thereby causing danger. Generally, the transformer oil entering the vessel body 120 from the inlet has a high initial flow rate. Therefore, a flow slowing structure is required to be provided in the vessel body 120 to slow down the flow rate of the transformer oil in the vessel body 120.
According to the oil-immersed generator transformer 100 of the embodiment of the application, a current-slowing structure 123 is arranged at a position, with a preset height, away from an oil inlet of the transformer, in the body 120. The predetermined height may be expressed as the current slowing structure 123 is disposed at a lower portion of the insulation structure between the low voltage winding 125 and the high voltage winding 127, and a bottom end of the current slowing structure 123 is substantially flush with a bottom end of the low voltage winding 125. The flow delaying structure 123 includes a first flow delaying portion 1231 having a U-shape and a second flow delaying portion 1233 located above the first flow delaying portion 1231 and supported by the first flow delaying portion 1231.
The U-shaped first buffer portion 1231 may be provided in plurality. Specifically, the U-shaped first moderate flow portions 1231 may be arranged one at a time at a predetermined distance in a direction surrounding the core CO (i.e., the plurality of first moderate flow portions 1231 may be arranged in a ring shape surrounding the core CO). The U-shaped opening of the first flow slowing portion 1231 faces the inlet of the transformer oil, so that a portion of the transformer oil entering through the inlet flows back again after impacting the bottom of the U-shape, thereby slowing down the flow velocity of the transformer oil. The first slow flow portion 1231 is formed of an insulating material (e.g., corrugated cardboard).
The second buffer portion 1233 includes a plurality of parallel tubular oil passages and a corresponding plurality of annular oil-blocking circuits above the tubular oil passages. The second moderate flow portion 1233 is formed of an insulating material (e.g., corrugated cardboard). The second flow alleviation portions 1233 are continuous in a direction around the core CO. Therefore, another portion of the transformer oil that does not enter the plurality of first buffer portions 1231 may flow upward via the gaps between the plurality of first buffer portions 1231 and then enter the tubular oil passage of the second buffer portion 1233. The tubular oil passage may allow a reduced flow rate of transformer oil entering therein. The transformer oil continuing to flow up through the tubular oil passage will be blocked by the oil-catch circuit and flow back down to further reduce the flow rate.
The transformer oil that flows back downward from the first and second buffer portions 1231 and 1233 has an appropriate flow rate and can flow into the corresponding winding region via the paths on the left and right sides below the first buffer portion 1231 to cool the coil.
The difference that the structure of slowing current that oil-immersed generator transformer 100 adopted compares traditional transformer according to this application embodiment lies in: the second flow slowing part 1233 is not directly arranged at the bottom of the insulation structure like the traditional transformer, and the space from the bottom of the winding coil to the lower iron yoke is increased (namely, the distance h) to slow down the flow speed of the transformer oil; instead, the U-shaped first buffering portion 1231 is added to the bottom of the insulation structure, and the second buffering portion 1233 is placed above the first buffering portion 1231, so that the flow rate of the transformer oil is slowed down to a reasonable range by the combination of the first and second buffering portions 1231 and 1233, without increasing the volume of the body 120.
In this way, the problem that the flow speed of transformer oil is too low due to the fact that the length of the second slow flow part is directly increased in a traditional transformer or the volume of a transformer body is increased due to the fact that the space from the bottom of a winding coil to a lower iron yoke is increased can be avoided.
Fig. 4 shows an example where a current slowing structure 123 is embedded in the insulation between the low voltage winding 125 and the high voltage winding 127. It will be appreciated that a current slowing structure may also be provided below the insulation between the high voltage winding 127 and the regulating winding 121 as desired. It will be appreciated that when the transformer is a three-phase transformer, there will be one buffer structure 123 around each phase core CO.
Fig. 5 is an enlarged view of a partial region X of the oil-filled generator transformer 100 according to the embodiment of the present application shown in fig. 2. In the local region X, one end of the low-voltage boost base 130 is connected to the tank cover 111 of the oil tank of the oil-immersed generator transformer 100, and the other end is connected to the low-voltage closed bus (or the low-voltage bushing), for leading out a low-voltage large-current lead of the low-voltage winding of the transformer 100.
As shown in fig. 5, a sunken flange 131 for connection with the low-pressure bushing is provided in the low-pressure boost seat 130. The sink flange 131 is annular. Fig. 5 shows two symmetrical flange regions of the annular drop flange 131 in vertical section. The main difference between the sunken flange 131 and the protruding flange 131 'of the conventional transformer on the low voltage raising seat 130' of the conventional transformer shown in fig. 1 is that: the sink flange 131 is not located on the upper surface of the low pressure rise block 130 but below the upper surface of the low pressure rise block 130; the thickness of the sunken flange 131 in the vertical direction is about one third of the protruded flange 131' of the conventional transformer.
Since the sink flange 131 is embedded in the low-pressure rising base 130, not externally installed, the sink flange 131 can be immersed in the transformer oil when the low-pressure rising base 130 is filled with the transformer oil. In this way, the heat dissipation of the sink flange 131 can be improved.
In addition, since the thickness of the sunken flange 131 is reduced to one third of that of the protruded flange 131' of the conventional transformer, the eddy current loss of the flange is reduced, thereby reducing the heat generation of the flange. That is, compared with the conventional transformer, the low-voltage rising base 130 of the oil-immersed generator transformer 100 according to the embodiment of the present application employs the improved sink-type flange 131, so that the heat dissipation of the flange and the low-voltage rising base including the flange is improved, and the low-voltage rising base is prevented from being locally overheated.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (11)
1. Oil-immersed generator transformer, include oil tank (110) and be located ware body (120) in the oil tank, the ware body includes iron Core (CO) and regulating winding (121), its characterized in that, regulating winding (121) include:
a first conductor (A) and a second conductor (B) wound around the Core (CO) in a parallel winding manner, each of the conductors being wound into a coil of NxM turns,
wherein an output terminal of the i × M turn coil of the first wire is connected to an input terminal of the (i-1) × M +1 turn coil of the second wire, an output terminal of the i × M turn coil of the second wire is connected to an input terminal of the i × M +1 turn coil of the second wire, an output terminal of the (i + 1) × M turn coil of the second wire is connected to an input terminal of the i × M +1 turn coil of the first wire, an output terminal of the (i + 1) × M turn coil of the first wire is connected to an input terminal of the (i + 1) × M +1 turn coil of the first wire, M, N is a positive integer, N > 1,i is an odd number and i < N, and
wherein a plurality of cushion blocks (140) are arranged between any two adjacent turns of coils, and a gap exists between two adjacent cushion blocks (140).
2. Oil filled generator transformer according to claim 1, characterized in that the spacer (140) is made of an insulating material and has the shape of a cuboid.
3. Oil filled generator transformer according to claim 1, characterized in that M corresponds to the preset adjustment fineness of the voltage of the regulating winding (121) and 2n +1 corresponds to the number of stages of voltage adjustment that the regulating winding (121) can make.
4. The oil filled generator transformer of any one of claims 1 to 3, wherein an output end of an i x M turn coil of the first wire and an input end of an (i-1) x M +1 turn coil of the second wire are connected to a first tap, an output end of an i x M turn coil of the second wire and an input end of an i x M +1 turn coil of the second wire are connected to a second tap, an output end of an (i + 1) x M turn coil of the second wire and an input end of an i x M +1 turn coil of the first wire are connected to a third tap, and an output end of an (i + 1) x M turn coil of the first wire and an input end of an (i + 1) x M +1 turn coil of the first wire are connected to a fourth tap.
5. Oil filled generator transformer according to claim 1, characterized in that the oil tank (110) comprises a tank cover (111) and a tank body (113), a first magnetic shield (115) is provided on the inner wall of the tank body (113) and a second magnetic shield (117) is provided on the inner wall of the tank cover (111),
wherein the second magnetic shield (117) is arranged on the inner wall of the case cover (111) at a position immediately adjacent to the first magnetic shield (115) and extends in a direction in which the Cores (CO) within the body (120) are aligned, the second magnetic shield (117) extending over a length exceeding the length of the body (120) in the direction.
6. Oil filled generator transformer according to claim 5, characterized in that the number of second magnetic shields (117) is two and that the two second magnetic shields (117) are arranged symmetrically with respect to the central axis of the oil tank (110).
7. Oil filled generator transformer according to claim 5 or 6, characterized in that the cover (111) of the oil tank (110) is in the shape of a mushroom head with four corners cut out of a rectangle, the mushroom head shape being such that the second magnetic shield (117) on the inner wall of the cover (111) is arranged at an obtuse angle to the first magnetic shield (115) on the inner wall of the box (113).
8. Oil filled generator transformer according to claim 1, characterized in that the bottom of the body (120) is provided with an inlet for transformer oil of the oil filled generator transformer (100),
wherein a flow slowing structure (123) is arranged in the body (120) at a preset height from the inlet, the flow slowing structure (123) comprises a first flow slowing part (1231) and a second flow slowing part (1233) positioned above the first flow slowing part, the first flow slowing part (1231) is U-shaped, the opening of the U-shaped part faces the inlet of the transformer oil, and the second flow slowing part (1233) comprises a tubular oil path and an oil blocking loop above the tubular oil path.
9. Oil filled generator transformer according to claim 8, characterized in that the number of the first snubbing parts (1231) is multiple, the first snubbing parts (1231) are arranged at predetermined distance intervals along the direction around the Core (CO), and
wherein the second flow slowing portion (1233) is continuous in a direction around the iron Core (CO).
10. Oil filled generator transformer according to claim 8 or 9, characterized in that the body (120) further comprises a low voltage winding (125), a high voltage winding (127) and an insulation between adjacent windings, the current slowing structure (123) being located at the bottom of the insulation between the low voltage winding (125) and the high voltage winding (127).
11. Oil filled generator transformer according to claim 1, characterized in that the oil filled generator transformer (100) further comprises a low voltage rising base (130) for leading out a low voltage side lead, a sinking flange (131) for connecting a low voltage bushing is arranged in the low voltage rising base (130), and the sinking flange (131) is located below the upper surface of the low voltage rising base (130) so that the sinking flange (131) can be immersed in transformer oil of the oil filled generator transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310173984.2A CN115863025B (en) | 2023-02-28 | 2023-02-28 | Transformer of oil immersed generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310173984.2A CN115863025B (en) | 2023-02-28 | 2023-02-28 | Transformer of oil immersed generator |
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| CN115863025A true CN115863025A (en) | 2023-03-28 |
| CN115863025B CN115863025B (en) | 2023-05-23 |
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| CN208796788U (en) * | 2018-06-04 | 2019-04-26 | 三变科技股份有限公司 | Four layer screw type loop constructions |
| CN212461356U (en) * | 2020-05-29 | 2021-02-02 | 广州西门子变压器有限公司 | Step-up seat assembly for power transformer and power transformer |
| CN215933343U (en) * | 2021-08-31 | 2022-03-01 | 济南西门子变压器有限公司 | Voltage regulating assembly for power transformer |
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| GB928072A (en) * | 1958-09-30 | 1963-06-06 | English Electric Co Ltd | Improvements in and relating to inductive apparatus including an oil-immersed winding |
| WO1997029494A1 (en) * | 1996-02-06 | 1997-08-14 | Yueliang Yu | A parallel winding voltage-regulating apparatus |
| CN201829319U (en) * | 2010-09-15 | 2011-05-11 | 特变电工沈阳变压器集团有限公司 | Low-voltage wire lead and outlet structure for transformer |
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| CN215933343U (en) * | 2021-08-31 | 2022-03-01 | 济南西门子变压器有限公司 | Voltage regulating assembly for power transformer |
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|---|---|
| CN115863025B (en) | 2023-05-23 |
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