Ice-melting rectifier transformer

Abstract

The utility model discloses an ice-melting rectifier transformer, which relates to the technical field of transformers, and comprises an oil tank, an iron core, an ice-melting rectifier transformer and an ice-melting rectifier transformer, the coil winding is located in the oil tank and installed on the outer side of the iron core; the cooling mechanism is mounted outside the oil tank; the high-voltage bushing and the low-voltage bushing are respectively mounted at the outer top of the oil tank, the high-voltage bushing and the low-voltage bushing are respectively positioned at two ends of the oil tank along the length direction, the high-voltage bushing and / or the low-voltage bushing are / is connected with the coil winding, and the width size of one end, corresponding to the low-voltage bushing, of the oil tank is gradually expanded towards the direction far away from the high-voltage bushing. According to the technical scheme, the oil tank in a special shape is arranged, under the condition that the capacity of the ice-melting rectifier transformer is large, the size is small, the weight is light, the sleeve and the cooling mechanism outside the oil tank and the coil winding inside the oil tank can be reasonably arranged, the structure is compact, and the occupied space is small.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to an ice-melting rectifier transformer. Background Art

[0002] Short-distance icing occurred on power transmission lines in many places. Freezing rain attached to the surface of the transmission lines to form uneven ice coverage, changing the external characteristics of the cross-section of the transmission lines. Under the action of stable wind of a certain speed and direction, the conductors produced self-excited vibrations, causing dancing, resulting in line tripping or even shutdown, which seriously threatened the safe and stable operation of the power grid.

[0003] Especially for 500kV and above lines, ice collapse has a huge impact on the power grid. A large-capacity ice-melting rectifier is urgently needed to melt the ice on the lines. However, large-capacity ice-melting rectifier transformers have the defects of large size, large space and heavy weight. On the other hand, there are unreasonable arrangements of high-voltage bushings, low-voltage bushings, cooling mechanisms and coil windings, resulting in a non-compact structure and large space occupation. Utility Model Content

[0004] The main purpose of the utility model is to propose an ice-melting rectifier transformer, which solves the defects of large-capacity ice-melting rectifier transformers, such as large size, large space occupation and heavy weight, and unreasonable arrangement of high-voltage bushings, low-voltage bushings, cooling mechanisms and coil windings, resulting in a non-compact structure and large space occupation.

[0005] To achieve the above-mentioned purpose, the ice-melting rectifier transformer proposed by the utility model comprises:

[0006] An oil tank, wherein an iron core is provided inside the oil tank;

[0007] a coil winding, the coil winding being located in the oil tank and mounted on the outer side of the core;

[0008] A cooling mechanism, wherein the cooling mechanism is installed outside the oil tank;

[0009] A high-voltage bushing and a low-voltage bushing, wherein the high-voltage bushing and the low-voltage bushing are respectively installed on the outer top of the oil tank, and the high-voltage bushing and the low-voltage bushing are respectively located at both ends of the oil tank along the length direction, the high-voltage bushing and / or the low-voltage bushing are connected to the coil winding, and the width dimension of one end of the oil tank corresponding to the low-voltage bushing is gradually expanded in the direction away from the high-voltage bushing.

[0010] In one embodiment, the oil tank includes a first mounting portion, a connecting portion, and a second mounting portion connected in sequence along its length direction, the low-pressure bushing is installed on the top of the first mounting portion, the high-pressure bushing is installed on the top of the second mounting portion, the cooling mechanism is installed on the first mounting portion and / or the second mounting portion, and the width dimension of the first mounting portion is gradually expanded from the connecting portion toward a direction away from the second mounting portion.

[0011] In one embodiment, a side of the first mounting portion away from the connecting portion is a first connecting side, and the oil tank further includes a first extending portion, the first extending portion extends from the first connecting side toward a direction away from the connecting portion, and the width dimension of the first extending portion is equidiametrically arranged, and the width dimension of the first extending portion is consistent with the width dimension of the first connecting side, and the first mounting portion and the first extending portion form a dovetail structure.

[0012] In one embodiment, there are multiple low-pressure bushings, and the multiple low-pressure bushings are installed at intervals along the width direction of the oil tank at the connection between the first installation portion and the first extension portion.

[0013] In one embodiment, a side of the second mounting portion away from the connecting portion is a second connecting side, and the oil tank further includes a second extending portion, the second extending portion extends from the second connecting side toward a direction away from the connecting portion, and the width dimension of the second extending portion is equidiametrically arranged, and the width dimension of the second extending portion is consistent with the width dimension of the second connecting side, and the second mounting portion and the second extending portion are connected to form a dovetail structure.

[0014] In one embodiment, the coil winding includes a low-voltage coil and a high-voltage coil for voltage regulation, and the low-voltage coil and the high-voltage coil are arranged on the outside of the iron core in sequence from the inside to the outside, the low-voltage coil is connected to the low-voltage bushing, and the high-voltage coil is connected to the high-voltage bushing.

[0015] In one embodiment, the low-voltage coil is a layered coil, the number of layers of the low-voltage coil includes at least two layers, and each layer of the low-voltage coil corresponds to a different voltage adjustment gear and a different number of turns of the low-voltage coil.

[0016] In one embodiment, the cooling mechanism includes a fan assembly and a heat sink assembly, wherein the fan assembly includes a first fan and a second fan, the first fan is installed on a side of the oil tank corresponding to the low-pressure bushing, the second fan is installed on a side of the oil tank corresponding to the high-pressure bushing, and the heat sink assembly includes a plurality of heat sinks, and the plurality of heat sinks are spaced apart on the outer peripheral wall of the oil tank.

[0017] In one embodiment, an oil storage cabinet is installed on the top of the oil tank, and the interior of the oil storage cabinet is connected to the interior of the oil tank through a pipeline.

[0018] In one embodiment, casters are provided at the bottom of the oil tank.

[0019] In the technical solution provided by the utility model, an iron core is arranged inside the oil tank of the ice-melting rectifier transformer, and a coil winding is installed outside the iron core. The iron core and the coil winding wound thereon together form a complete electromagnetic induction system, which is the key to the transformer's ability to convert AC voltage, current and impedance. In addition, a cooling mechanism is arranged outside the oil tank, which can quickly dissipate the large amount of heat generated inside the transformer in a timely manner, thereby ensuring that the temperature of the transformer will not be too high and avoiding accidents due to overheating. The high-voltage bushing and the low-voltage bushing are arranged at both ends of the length direction of the oil tank, and the high-voltage bushing and / or the low-voltage bushing are connected to the coil winding to insulate the coil winding from the oil tank and fix the lead-out wire of the coil winding. The width dimension of one end of the oil tank corresponding to the low-pressure bushing is gradually expanded in the direction away from the high-pressure bushing, thereby increasing the installation area of ​​one end of the oil tank corresponding to the low-pressure bushing and facilitating the installation of the low-pressure bushing. On the one hand, the bushing and the cooling mechanism are arranged outside the oil tank, and only the iron core and the coil winding are arranged inside the oil tank. While meeting the demand for large capacity, the volume is small, the space occupied is small, and the weight is light. On the other hand, the low-pressure bushing and the high-pressure bushing are respectively arranged at both ends of the oil tank. Except for the width dimension of the position corresponding to the installation of the low-pressure bushing, the oil tank does not need to be increased. The layout is reasonable, the structure is compact, and the space occupied is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 A schematic top view of an embodiment of an ice-melting rectifier transformer provided by the utility model;

[0022] Figure 2 A front view schematic diagram of an embodiment of an ice-melting rectifier transformer provided by the utility model;

[0023] Figure 3 The utility model is a side view schematic diagram of an embodiment of an ice-melting rectifier transformer provided by the utility model.

[0024] Description of Figure Numbers:

[0025] 100. Ice-melting rectifier transformer; 1. Oil tank; 11. First mounting portion; 12. Connecting portion; 13. Second mounting portion; 14. First extension portion; 15. Second extension portion; 2. Casters; 3. Cooling mechanism; 31. Heat sink assembly; 32. Fan assembly; 4. High-voltage bushing; 5. Low-voltage bushing; 6. Insulator; 7. Copper busbar; 8. Oil storage cabinet; 9. Gas relay; 10. Insulating bracket.

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0030] Short-distance icing occurred on power transmission lines in many places. Freezing rain attached to the surface of the transmission lines to form uneven ice coverage, changing the external characteristics of the cross-section of the transmission lines. Under the action of stable wind of a certain speed and direction, the conductors produced self-excited vibrations, causing dancing, resulting in line tripping or even shutdown, which seriously threatened the safe and stable operation of the power grid.

[0031] Especially for 500kV and above lines, ice collapse has a huge impact on the power grid. A large-capacity ice-melting rectifier is urgently needed to melt the ice on the lines. However, large-capacity ice-melting rectifier transformers have the defects of large size, large space and heavy weight. On the other hand, there are unreasonable arrangements of high-voltage bushings, low-voltage bushings, cooling mechanisms and coil windings, resulting in a non-compact structure and large space occupation.

[0032] In order to solve this technical problem, the utility model provides an ice-melting rectifier transformer to solve the defects of large-capacity ice-melting rectifier transformers, such as large size, large space occupation and heavy weight, and unreasonable arrangement of high-voltage bushings, low-voltage bushings, cooling mechanisms and coil windings, resulting in a non-compact structure and large space occupation.

[0033] See also Figures 1 to 3 The ice-melting rectifier transformer 100 includes an oil tank 1, a coil winding, a cooling mechanism 3, a high-voltage bushing 4 and a low-voltage bushing 5, wherein an iron core is provided inside the oil tank 1, the coil winding is located in the oil tank 1 and installed on the outside of the iron core, the high-voltage bushing 4 and the low-voltage bushing 5 are respectively installed on the top outside the oil tank 1, and the high-voltage bushing 4 and the low-voltage bushing 5 are respectively located at both ends of the oil tank 1 along the length direction, the high-voltage bushing 4 and / or the low-voltage bushing 5 are connected to the coil winding, and the width dimension of the oil tank 1 corresponding to one end of the low-voltage bushing 5 is gradually expanded in the direction away from the high-voltage bushing 4.

[0034] In the ice melting rectifier transformer 100 of the utility model, and referring to Figures 1 to 3 The oil tank 1 of the ice melting rectifier transformer 100 is provided with an iron core, and a coil winding is installed outside the iron core. The iron core and the coil winding wound thereon together form a complete electromagnetic induction system, which is the key to the transformer's ability to transform AC voltage, current and impedance. In addition, a cooling mechanism 3 is provided outside the oil tank 1, which can quickly dissipate the large amount of heat generated inside the transformer in a timely manner, thereby ensuring that the temperature of the transformer will not be too high, and avoiding accidents caused by overheating.

[0035] It can be understood that the length direction of the fuel tank 1 is Figure 1 In the left and right directions shown, the width direction of the fuel tank 1 is Figure 1The front-to-back direction shown. In one embodiment, the high-voltage bushing 4 and the low-voltage bushing 5 are arranged at both ends of the oil tank 1 in the left and right directions, and the high-voltage bushing 4 and the low-voltage bushing 5 are connected to the coil winding, and the coil winding is insulated from the oil tank 1 and the lead wire of the coil winding is fixed. The width dimension of the oil tank 1 corresponding to one end of the low-voltage bushing 5 is gradually expanded in the direction away from the high-voltage bushing 4, that is, the front-to-back dimension of the left end of the oil tank 1 gradually increases to the left, which increases the installation area of ​​the left end of the oil tank 1 and facilitates the installation of the low-voltage bushing 5. On the one hand, the high-voltage bushing 4, the low-voltage bushing 5 and the cooling mechanism 3 are arranged outside the oil tank 1, and only the iron core and the coil winding are arranged inside the oil tank 1. Under the condition of meeting the large capacity demand, the volume is small, the space occupied is small, and the weight is light. On the other hand, the low-voltage bushing 5 and the high-voltage bushing 4 are respectively arranged at the left and right ends of the oil tank 1, and the width dimension of the oil tank 1 does not need to be increased except for the position corresponding to the installation of the low-voltage bushing 5. The layout is reasonable, the structure is compact, and the space occupied is small.

[0036] In one embodiment, the core is a three-phase three-column structure, and the core material can be made of amorphous alloy strip, which has high hardness and corrosion resistance, thereby preventing local discharge and internal corrosion caused by excessive voltage.

[0037] In one embodiment, the oil tank 1 includes a first mounting portion 11, a connecting portion 12 and a second mounting portion 13 which are connected in sequence along its length direction. A low-pressure bushing 5 is installed on the top of the first mounting portion 11, and a high-pressure bushing 4 is installed on the top of the second mounting portion 13. The cooling mechanism 3 is installed on the first mounting portion 11, and the width dimension of the first mounting portion 11 is gradually expanded from the connecting portion 12 toward a direction away from the second mounting portion 13.

[0038] For details, please refer to Figure 1 The oil tank 1 includes a first mounting portion 11, a connecting portion 12 and a second mounting portion 13. The first mounting portion 11, the connecting portion 12 and the second mounting portion 13 are sequentially connected along the left and right directions of the oil tank 1, and can be a split type or an integrated type. A low-pressure bushing 5 is installed on the top of the first mounting portion 11, and a high-pressure bushing 4 is installed on the top of the second mounting portion 13. The cooling mechanism 3 can be installed on the first mounting portion 11. The width dimension of the first mounting portion 11 is gradually expanded from the connecting portion 12 toward the direction away from the second mounting portion 13, that is, the front-to-back dimension of the right end of the oil tank 1 gradually increases toward the right, which increases the installation area of ​​the right end of the oil tank 1, and is convenient for installing the high-pressure bushing 4. The width dimension of the oil tank 1 does not need to be increased except for the position corresponding to the installation of the low-pressure bushing 5, and the overall occupied space is small.

[0039] In one embodiment, the cooling mechanism 3 may also be installed on the second installation portion 13 , and the installation position of the cooling mechanism 3 may be reasonably selected according to needs.

[0040] In one embodiment, the total length of the ice-melting rectifier transformer 100 shall not exceed 18 meters, the total width shall not exceed 2.5 meters, and the total height shall not exceed 4 meters from the ground under the road transportation regulations. Therefore, the size of the ice-melting rectifier transformer 100 in this embodiment is limited to 6 meters in length, 2.5 meters in width, and 3.5 meters in height, so that the ice-melting rectifier transformer 100 can be placed on a 13-meter flatbed truck.

[0041] In one embodiment, a side of the first mounting portion 11 away from the connecting portion 12 is a first connecting side, and the fuel tank 1 further includes a first extending portion 14, which extends from the first connecting side toward a direction away from the connecting portion 12, and a width dimension of the first extending portion 14 is equidiametrically arranged, and a width dimension of the first extending portion 14 is consistent with a width dimension of the first connecting side, and the first mounting portion 11 and the first extending portion 14 form a dovetail structure.

[0042] Please also read Figure 1 The left side of the first mounting portion 11 is the first connecting side, the first extension portion 14 extends leftward from the first connecting side, and the width dimension of the first extension portion 14 is set to be equal in diameter, and the width dimension of the first extension portion 14 is consistent with the dimension of the first connecting side. The first mounting portion 11 and the first extension portion 14 form a dovetail structure, which increases the installation area of ​​the left end of the oil tank 1 and facilitates the installation of the low-pressure bushing 5. The width dimension of the oil tank 1 does not need to be increased except for the position corresponding to the installation of the low-pressure bushing 5, and the overall occupied space is small.

[0043] In one embodiment, there are multiple low-pressure bushings 5 ​​, and the multiple low-pressure bushings 5 ​​are installed at intervals along the width direction of the oil tank 1 at the connection between the first installation portion 11 and the first extension portion 14 .

[0044] For details, please refer to Figure 1 There are six low-pressure bushings 5, which are installed at intervals along the width direction of the oil tank 1 at the connection between the first installation portion 11 and the first extension portion 14, and the six low-pressure bushings 5 ​​are arranged at equal distances, with a reasonable layout to avoid interference.

[0045] In one embodiment, a side of the second mounting portion 13 away from the connecting portion 12 is a second connecting side, and the fuel tank 1 further includes a second extending portion 15, which extends from the second connecting side toward a direction away from the connecting portion 12, and a width dimension of the second extending portion 15 is equidiametrically arranged, and a width dimension of the second extending portion 15 is consistent with a width dimension of the second connecting side, and the second mounting portion 13 and the second extension portion 15 are connected to form a dovetail structure.

[0046] For details, please refer to Figure 1The right side of the second mounting portion 13 is the second connecting side, the second extending portion 15 extends rightward from the second connecting side, and the width dimension of the second extending portion 15 is set to be equal in diameter, and the width dimension of the second extending portion 15 is consistent with the dimension of the second connecting side. The second mounting portion 13 and the second extending portion 15 form a dovetail structure, which increases the installation area of ​​the right end of the oil tank 1 and facilitates the installation of the high-voltage bushing 4. The width dimension of the oil tank 1 does not need to be increased except for the position corresponding to the installation of the high-voltage bushing 4, and the overall occupied space is small.

[0047] In one embodiment, the coil winding includes a low-voltage coil and a high-voltage coil for voltage regulation. The low-voltage coil and the high-voltage coil are arranged on the outside of the iron core from the inside to the outside. The low-voltage coil is connected to the low-voltage bushing 5, and the high-voltage coil is connected to the high-voltage bushing 4.

[0048] The coil winding includes a low-voltage coil and a high-voltage coil, which are arranged on the outside of the iron core from the inside to the outside. The low-voltage coil is connected to the low-voltage bushing 5, and the high-voltage coil is connected to the high-voltage bushing 4. The low-voltage coil is used for voltage regulation, thereby eliminating the voltage regulating coil and saving costs.

[0049] In one embodiment, the low-voltage coil is a layered coil, and the number of layers of the low-voltage coil includes at least two layers, and each layer of the low-voltage coil corresponds to a different voltage adjustment gear and a different number of turns of the low-voltage coil.

[0050] The low-voltage coil is a layered coil. The number of layers of the low-voltage coil can be 5. Each layer corresponds to a different voltage adjustment gear and a different number of turns of the low-voltage coil. The leakage magnetic area and the number of turns of the low-voltage coil are controlled to reduce the change in the product of the leakage magnetic area and the number of turns of the low-voltage coil, thereby reducing the impedance voltage. The high-voltage coil adopts a pancake coil.

[0051] In one embodiment, the capacity of the ice-melting rectifier transformer 100 is 17100kVA with a high-voltage 35kV input and a low-voltage output of 5 voltage levels ranging from 1000V to 4000V, and it ensures that the current of each level is a constant current 1372A AC output, and the output pulse number is 12 pulses, which meets the operating function of the ice-melting rectifier transformer 100.

[0052] In one embodiment, the low-voltage coil includes an upper winding and a lower winding arranged along the axial direction of the iron core, the upper winding of the low-voltage coil is connected in a D-connection manner, and the lower winding is connected in a Y-connection manner, and each layer of the low-voltage coil has a tap in the upper winding and the lower winding, and the two taps tapped in the same layer of the low-voltage coil correspond to the same voltage adjustment gear; the closer the distance between the taps tapped from the upper winding and the lower winding of the low-voltage coil and the iron core, the lower the voltage adjustment gear corresponding to the two taps tapped in the same layer of the low-voltage coil, the lower the low voltage, and the fewer the number of layers connected to the low-voltage coil; the farther the distance between the taps tapped from the upper winding and the lower winding of the low-voltage coil and the iron core, the higher the voltage adjustment gear corresponding to the two taps tapped in the same layer of the low-voltage coil, the higher the low voltage, and the more the number of layers connected to the low-voltage coil.

[0053] Specifically, the low-voltage coil may be a multi-layer cylindrical coil. The multi-layer cylindrical coil makes the selection of the conductor more flexible and extensive, and the distance between two adjacent layers of coils can be adjusted more flexibly and conveniently.

[0054] In one embodiment, the insulator 6 and the low-voltage bushing 5 may be connected via a copper busbar 7 to facilitate installation and disassembly.

[0055] In one embodiment, the ice-melting rectifier transformer 100 also includes an insulating bracket 10, which is installed outside the oil tank 1. There are multiple insulators 6, and the multiple insulators 6 are installed on the insulating bracket 10 at intervals along the front and rear direction of the oil tank 1. The multiple insulators 6 are arranged parallel to each other, and the number of the multiple insulators 6 and the multiple low-voltage bushings 5 ​​are consistent and arranged one-to-one, thereby improving safety.

[0056] In one embodiment, the cooling mechanism 3 includes a fan assembly 32 and a heat sink assembly 31, the fan assembly 32 includes a first fan and a second fan, the first fan is installed on the side of the oil tank 1 corresponding to the low-pressure bushing 5, and the second fan is installed on the side of the oil tank 1 corresponding to the high-pressure bushing 4, and the heat sink assembly 31 includes a plurality of heat sinks, and the plurality of heat sinks are spaced apart on the outer peripheral wall of the oil tank 1.

[0057] For details, please refer to Figure 1 The cooling mechanism 3 includes a fan assembly 32 and a heat sink assembly 31. The fan assembly 32 includes a first fan and a second fan. The first fan is installed on the left side of the oil tank 1 corresponding to the low-voltage bushing 5, and the second fan is installed on the right side of the oil tank 1 corresponding to the high-voltage bushing 4. The first fan and the second fan can operate simultaneously or separately, and can dissipate the heat generated inside the transformer in time. The heat sink assembly 31 includes a plurality of heat sinks, which are arranged on the outer wall of the oil tank 1 at intervals to improve the heat dissipation efficiency.

[0058] Furthermore, an oil storage cabinet 8 is installed on the top of the oil tank 1, and the interior of the oil storage cabinet 8 is connected to the interior of the oil tank 1 through a pipeline.

[0059] An oil storage cabinet 8 is installed on the top of the oil tank 1. The oil storage cabinet 8 is connected to the oil tank 1 through a pipeline, which is convenient for timely delivery of oil to the oil tank 1. The oil, as an insulating medium, can effectively isolate the coil windings and other conductors to prevent accidents such as electric arcs and electric shocks.

[0060] In one embodiment, a gas relay 9 is further provided on the pipeline between the oil storage cabinet 8 and the oil tank 1 to prevent a large amount of gas generated from damaging the transformer when a serious fault occurs inside the oil tank 1 .

[0061] In one embodiment, casters 2 are provided at the bottom of the oil tank 1, which are easy to move while meeting the large capacity requirement, and can cover any ice-covered point of the entire cable line, thereby improving the efficiency of ice melting.

[0062] In one embodiment, a locking member is installed on the caster 2 , and the locking member belongs to the prior art and can lock the position of the ice-melting rectifier transformer 100 .

[0063] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An ice-melting rectifier transformer, characterized in that: The ice-melting rectifier transformer comprises: An oil tank, wherein an iron core is provided inside the oil tank; A coil winding, the coil winding is located in the oil tank and installed on the outside of the core; A cooling mechanism, wherein the cooling mechanism is installed outside the oil tank; A high-voltage bushing and a low-voltage bushing, wherein the high-voltage bushing and the low-voltage bushing are respectively installed on the outer top of the oil tank, and the high-voltage bushing and the low-voltage bushing are respectively located at both ends of the oil tank along the length direction, the high-voltage bushing and / or the low-voltage bushing are connected to the coil winding, and the width dimension of one end of the oil tank corresponding to the low-voltage bushing is gradually expanded in the direction away from the high-voltage bushing.

2. The ice-melting rectifier transformer according to claim 1, characterized in that: The oil tank includes a first mounting portion, a connecting portion, and a second mounting portion that are connected in sequence along its length direction. The low-pressure bushing is installed on the top of the first mounting portion, and the high-pressure bushing is installed on the top of the second mounting portion. The cooling mechanism is installed on the first mounting portion and / or the second mounting portion, and the width dimension of the first mounting portion is gradually expanded from the connecting portion toward a direction away from the second mounting portion.

3. The ice-melting rectifier transformer according to claim 2, characterized in that: The side of the first mounting portion away from the connecting portion is a first connecting side, and the oil tank also includes a first extending portion, which extends from the first connecting side toward a direction away from the connecting portion, and the width dimension of the first extending portion is equidiametrically set, and the width dimension of the first extending portion is consistent with the width dimension of the first connecting side, and the first mounting portion and the first extending portion form a dovetail structure.

4. The ice-melting rectifier transformer according to claim 3, characterized in that: There are multiple low-pressure bushings, and the multiple low-pressure bushings are installed at intervals along the width direction of the oil tank at the connection between the first installation part and the first extension part.

5. The ice-melting rectifier transformer according to claim 3, characterized in that: The side of the second mounting portion away from the connecting portion is a second connecting side. The oil tank also includes a second extending portion, which extends from the second connecting side in a direction away from the connecting portion, and the width dimension of the second extending portion is equidiametrically set, and the width dimension of the second extending portion is consistent with the width dimension of the second connecting side. The second mounting portion and the second extending portion are connected to form a dovetail structure.

6. The ice-melting rectifier transformer according to claim 1, characterized in that: The coil winding includes a low-voltage coil and a high-voltage coil for voltage regulation. The low-voltage coil and the high-voltage coil are arranged on the outside of the iron core in sequence from the inside to the outside. The low-voltage coil is connected to the low-voltage bushing, and the high-voltage coil is connected to the high-voltage bushing.

7. The ice-melting rectifier transformer according to claim 6, characterized in that: The low-voltage coil is a layered coil, and the number of layers of the low-voltage coil includes at least two layers, and each layer of the low-voltage coil corresponds to a different voltage adjustment gear and a different number of turns of the low-voltage coil.

8. The ice-melting rectifier transformer according to any one of claims 1 to 7, characterized in that: The cooling mechanism includes a fan assembly and a heat sink assembly, the fan assembly includes a first fan and a second fan, the first fan is installed on a side of the oil tank corresponding to the low-pressure bushing, the second fan is installed on a side of the oil tank corresponding to the high-pressure bushing, and the heat sink assembly includes a plurality of heat sinks, and the plurality of heat sinks are spaced apart on the outer peripheral wall of the oil tank.

9. The ice-melting rectifier transformer according to any one of claims 1 to 7, characterized in that: An oil storage cabinet is installed on the top of the oil tank, and the interior of the oil storage cabinet is connected with the interior of the oil tank through a pipeline.

10. The ice-melting rectifier transformer according to any one of claims 1 to 7, characterized in that: Casters are arranged at the bottom of the oil tank.

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