CN113363056B - 110 kV-level resin-cast insulating transformer with C-shaped groove iron core air passage structure - Google Patents
110 kV-level resin-cast insulating transformer with C-shaped groove iron core air passage structure Download PDFInfo
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- CN113363056B CN113363056B CN202110921123.9A CN202110921123A CN113363056B CN 113363056 B CN113363056 B CN 113363056B CN 202110921123 A CN202110921123 A CN 202110921123A CN 113363056 B CN113363056 B CN 113363056B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F2027/348—Preventing eddy currents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
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Abstract
The invention relates to a 110kV resin casting insulation transformer with a C-shaped groove iron core airway structure, which comprises a transformer main body, wherein an installation fixing unit is arranged below the transformer main body, the installation fixing unit comprises a first concave block, a plurality of installation holes are formed in the surface of the first concave block, a second concave block is arranged above the first concave block, a screw rod is fixedly connected to the inner wall of the second concave block, and a heat dissipation protection unit is arranged on the outer side of the main body; through the structure of heat dissipation protection unit, protection casing, hinge, isolating door, fan, louvre and dust screen, realized providing a dustproof function of heat dissipation to this transformer body, solved long-time work and can lead to the during operation temperature rise too high, cause the phenomenon of transformer performance decline to the work efficiency of this transformer has been influenced, the problem of practicality has been reduced, thereby dustproof better guarantee of providing for the heat dissipation of this transformer, strengthened life.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a 110kV resin cast insulation transformer with a C-shaped groove iron core air passage structure.
Background
The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, and the main components are a primary coil, a secondary coil and an iron core, and the transformer has the main functions of voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization and the like.
The transformer is basic equipment of power transmission and distribution, and the wide application in fields such as industry, agriculture, traffic, city community has great energy-conserving potentiality, for accelerating high-efficient energy-saving transformer popularization and application, promote energy resource utilization efficiency, promote green low carbon and high quality development.
But the dustproof effect of the heat dissipation of most of transformers that use at present is not good, produces high temperature easily at the transformer during operation, and long-time work can lead to during operation temperature rise too high, causes the phenomenon of transformer performance decline to the work efficiency of this transformer has been influenced, has reduced the practicality.
In summary, the prior art still lacks a cooling device which can cool the transformer differently according to the winding temperature of the transformer, the oil level of the transformer and the oil temperature of the transformer, and is difficult to improve the cooling effect of the transformer.
Disclosure of Invention
Therefore, the invention provides a 110kV resin-cast insulating transformer with a C-shaped groove iron core air passage structure, which is used for overcoming the problem that the temperature reduction effect of the transformer is difficult to improve because the transformer can be cooled differently according to the winding temperature of the transformer, the oil level and the oil temperature of the transformer in the prior art.
In order to achieve the purpose, the invention provides a 110kV resin casting insulation transformer with a C-shaped groove iron core air passage structure, which comprises,
the transformer comprises a transformer main body, a temperature sensor, a voltage meter and an ammeter, wherein the transformer main body is provided with an environment thermometer for measuring the air temperature of the environment where the transformer main body is located;
the mounting and fixing unit is arranged below the transformer main body and comprises a first concave block, a plurality of mounting holes are formed in the surface of the first concave block, a second concave block is arranged above the first concave block, and a screw rod is fixedly connected to the inner wall of the second concave block;
the heat dissipation protection unit is arranged on the outer side of the transformer main body and comprises a protection cover, one side of the protection cover is fixedly connected with a hinge, the other side of the hinge is fixedly connected with an isolation door, and a fan is arranged on the protection cover;
the ultrasonic distance measuring device comprises a first ultrasonic distance measuring device, a second ultrasonic distance measuring device and a third ultrasonic distance measuring device, wherein the first ultrasonic distance measuring device is arranged on a protective cover corresponding to a first fan and used for detecting the distance between the left side of the position of the transformer main body and the obstacle, the second ultrasonic distance measuring device is arranged on the protective cover corresponding to the second fan and used for detecting the distance between the right side of the position of the transformer main body and the obstacle, and the third ultrasonic distance measuring device is arranged on the protective cover corresponding to a third fan and used for detecting the distance between the upper side of the position of the transformer main body and the obstacle;
the central control unit is connected with the voltmeter and the ammeter and used for receiving the voltage and the current detected by the voltmeter and the ammeter, the central control unit is connected with the environment thermometer and used for receiving the environment temperature measured by the environment thermometer, the central control unit is connected with the transformer top layer oil temperature meter and used for receiving the upper layer temperature of the transformer oil measured by the transformer top layer oil temperature meter, the central control unit is connected with the transformer winding temperature meter and used for receiving the transformer winding temperature measured by the transformer winding temperature meter, the central control unit is connected with the oil level meter and used for receiving the oil level height of the transformer main body, the central control unit is respectively connected with the first ultrasonic range finder, the second ultrasonic range finder and the third ultrasonic range finder and used for receiving obstacles, measured by the first ultrasonic range finder, the second ultrasonic range finder and the third ultrasonic range finder, of which are located at the left side of the transformer main body, The central control unit is connected with the first fan, the second fan and the third fan and used for controlling the running states of the first fan, the second fan and the third fan;
the central control unit calculates an oil temperature reference value according to the oil level height value of the transformer oil and the transformer oil temperature, determines the opened fan according to the real-time oil temperature reference value, and determines the running states of the first fan and the second fan according to data measured by the first ultrasonic distance meter and the second ultrasonic distance meter if the first fan and the second fan are opened;
if the first fan, the second fan and the third fan are turned on, the central control unit compares distance data measured by the third ultrasonic distance meter with a preset distance reference value, determines the running state of the third fan if the distance between the transformer main body and an obstacle above the transformer main body measured in real time is smaller than or equal to the preset distance reference value, and determines the running states of the first fan and the second fan according to the data measured by the first ultrasonic distance meter and the second ultrasonic distance meter;
if the distance between the transformer main body and the obstacle above the transformer main body, which is measured in real time, is larger than a preset distance reference value, the central control unit calculates the difference value between the environment temperature value measured in real time by the environment thermometer and the transformer winding temperature measured by the transformer winding thermometer, compares the difference value with the preset winding temperature difference value, and determines the running states of the first fan, the second fan and the third fan according to the comparison result;
the central control unit calculates the load rate of the transformer main body according to data transmitted by the voltmeter and the ammeter in real time, determines the wind speed of the opened fan according to the load rate, adjusts the determined fan wind speed according to the real-time oil temperature reference value, and operates according to the adjusted fan wind speed.
Further, the central control unit receives the oil level height of the transformer oil measured by the oil level indicator and the upper layer temperature of the transformer oil measured by the transformer top oil temperature gauge in real time, and determines an oil temperature reference value according to the real-time oil level height of the transformer oil and the upper layer temperature of the transformer oil, if the real-time transformer oil level value is set to be Yh, the real-time transformer oil temperature is set to be Yt, and the oil temperature reference value is set to be y,
y=Yh/Yh0+Yt/Yt0
wherein y represents an oil temperature reference value, Yh represents a real-time transformer oil level value, Yh0 represents a preset transformer oil level value, Yt represents a real-time transformer oil temperature, and Yt0 represents a preset transformer oil temperature.
Further, the central control unit compares the oil temperature reference value calculated in real time with a preset oil temperature reference value, determines the turned-on fan, sets a first reference value of the oil temperature as Y1, sets a second reference value of the oil temperature as Y2, sets Y1 < Y2,
if Y is less than or equal to Y1, the central control unit determines not to turn on the fan;
if Y is greater than Y1 and less than or equal to Y2, the central control unit determines to turn on the first fan and the second fan;
if Y > Y2, the central control unit determines to turn on the first fan, the second fan and the third fan.
Further, the central control unit receives data measured by the first ultrasonic distance meter, the second ultrasonic distance meter and the third ultrasonic distance meter to determine the operation of the fan, sets the distance between the transformer body measured by the first ultrasonic distance meter and the left obstacle to be Lz, the distance between the transformer body measured by the second ultrasonic distance meter and the right obstacle to be Ly, the distance between the transformer body measured by the third ultrasonic distance meter and the upper obstacle to be Ls, and the distance reference value to be Lc1, then,
when the first fan and the second fan are turned on, the central control unit determines the operation of the first fan and the second fan according to the data measured by the first ultrasonic distance meter and the second ultrasonic distance meter,
if the Lz is larger than or equal to the Ly, the central control unit controls the first fan to rotate to convey the air in the protective cover to the outside of the protective cover, and controls the second fan to rotate to convey the air outside the protective cover to the inside of the protective cover;
if Lz is less than Ly, the central control unit controls the first fan to rotate so as to convey the air outside the protective cover into the protective cover, and controls the second fan to rotate so as to convey the air inside the protective cover out of the protective cover.
Further, if the first fan, the second fan and the third fan are turned on, the central control unit determines the operation of the first fan, the second fan and the third fan according to the data measured by the first ultrasonic distance meter, the second ultrasonic distance meter and the third ultrasonic distance meter,
if Ls is less than or equal to Lc1 and Lz is greater than or equal to Ly, the central control unit controls the first fan to rotate to convey the air inside the protective cover to the outside of the protective cover, controls the second fan to rotate to convey the air outside the protective cover to the inside of the protective cover, and controls the third fan to rotate to convey the air outside the protective cover to the inside of the protective cover;
if Ls is less than or equal to Lc1 and Lz is less than Ly, the central control unit controls the first fan to rotate to convey the air outside the protective cover into the protective cover, controls the second fan to rotate to convey the air inside the protective cover out of the protective cover, and controls the third fan to rotate to convey the air outside the protective cover into the protective cover.
Further, when Ls is greater than Lc1, the central control unit determines the operation of the first fan, the second fan and the third fan according to the difference between the environment temperature value measured by the environment thermometer in real time and the transformer winding temperature measured by the transformer winding temperature table, sets the real-time environment temperature value as Th, the real-time transformer winding temperature value as Tr, and sets the first winding temperature difference Tr1, then,
if Tr-Th is larger than or equal to Tr1, and Lz is larger than or equal to Ly, the central control unit controls the first fan to rotate to convey the air in the protective cover to the outside of the protective cover, controls the second fan to rotate to convey the air outside the protective cover to the inside of the protective cover, and controls the third fan to rotate to convey the air in the protective cover to the outside of the protective cover;
if Tr-Th is larger than or equal to Tr1 and Lz is smaller than Ly, the central control unit controls the first fan to rotate to convey air outside the protective cover into the protective cover, controls the second fan to rotate to convey air inside the protective cover out of the protective cover, and controls the third fan to rotate to convey air inside the protective cover out of the protective cover;
if Tr-Th is less than Tr1, the central control unit controls the first fan to rotate to convey the air outside the shield into the shield, controls the second fan to rotate to convey the air outside the shield into the shield, and controls the third fan to rotate to convey the air inside the shield out of the shield.
Further, the central control unit calculates the load rate of the transformer main body according to data transmitted by the voltmeter and the ammeter in real time, and determines the wind speed of the fan according to the load rate;
setting the real-time load rate of the transformer body as Zs, setting a first load reference value Z1 of the transformer body, setting a second load reference value Z2 of the transformer body, and setting a third load reference value Z3 of the transformer body, wherein Z1 is more than Z2 and more than Z3;
the first preset wind speed of the fan is set to be V1, the second preset wind speed of the fan is set to be V2, the third preset wind speed of the fan is set to be V3, the fourth preset wind speed of the fan is set to be V4, and V1 is more than V2 and more than V3 and more than V4.
Further, the wind speed of the fan is determined by the central control unit,
if Zs is less than or equal to Z1, the central control unit determines that the wind speed of the opened fan is V1;
if Z1 is larger than Zs and smaller than or equal to Z2, the central control unit determines that the wind speed of the opened fan is V2;
if Z2 is larger than Zs and smaller than or equal to Z3, the central control unit determines that the wind speed of the opened fan is V3;
if Zs > Z3, the central control unit determines the wind speed of the opened fan to be V4.
Further, the central control unit adjusts the wind speed of the fan according to the real-time oil temperature reference value, sets the real-time wind speed of the fan as Vi, sets i =1, 2, 3, 4,
if Y is less than or equal to Y1, the central control unit does not adjust the wind speed of the fan;
if Y is greater than Y1 and less than or equal to Y2, the central control unit adjusts the wind speed of the fan to be Vx, and Vx = V (i + 1);
if Y is more than Y2, the central control unit adjusts the wind speed of the fan to be V4;
and when the adjusted Vx is larger than V4, taking V4 as the adjusted fan speed.
Furthermore, a resin casting insulating layer is fixedly connected to the surface of the transformer main body, and the size of the resin casting insulating layer is matched with that of the transformer main body;
the mounting holes and the first concave block are of a penetrating structure, and the mounting holes are distributed on the first concave block at equal intervals; the second concave block is movably connected with the first concave block through a screw rod, and the second concave block and the first concave block are vertically distributed.
Compared with the prior art, the invention has the advantages that the invention provides the 110kV resin casting insulation transformer with the C-shaped groove iron core air channel structure, the central control unit calculates the oil temperature reference value according to the oil level height value of transformer oil and the transformer oil temperature, determines the opened fan according to the real-time oil temperature reference value, determines the running states of the first fan, the second fan and the third fan according to the data measured by the ultrasonic distance meter and the difference value between the environmental temperature and the transformer winding temperature, determines the running state of the fan, determines the wind speed of the fan according to the load factor of the transformer, adjusts the determined wind speed of the fan according to the real-time oil temperature reference value, runs according to the determined running state and wind speed of the fan, and adjusts in real time along with the change of the real-time data, so that the running state and the wind speed of fan reach the cooling effect of transformer, combine the fixed unit of installation moreover, can reduce the vortex that transformer working process produced through the setting in C type groove, the setting in C type groove can carry the air volume, and then improves the cooling effect.
Particularly, the opening number of the fans is determined through the oil temperature reference value, the oil temperature reference value is calculated through two parameters of the oil temperature and the oil level, the oil level is raised due to thermal expansion of the transformer oil when the temperature of the transformer oil is high, the temperature rise of the transformer oil can be accurately judged by setting the oil temperature reference value, the working environment of the transformer main body is accurately judged, the opening number of the fans is adjusted, the cooling operation can be performed in a targeted mode, and the cooling effect is improved.
Particularly, in the invention, if three fans are turned on, the running state of the third fan is firstly determined, and according to the distance between the upper part of the transformer main body and the obstacle, if the distance is smaller than a preset value, the upper part of the transformer main body is not suitable for exhausting air, the third fan is rotated to convey the air outside the protective cover into the protective cover, so that the cooling effect of the fans is improved. And then the running states of the first fan and the second fan are determined according to the distance between the left side and the right side of the transformer main body and the obstacle, and the running states of the fans under different conditions are set differently, so that the cooling effect is improved.
Further, if the distance between the upper side of the transformer main body and the obstacle is larger than a preset value, the central control unit preferentially sets the running state of the third fan to enable the third fan to rotate to convey air in the protective cover to the outside of the protective cover, and then the running states of the first fan and the second fan are determined according to the difference value between the real-time measured environmental temperature value and the temperature of the transformer winding and the distance between the left side of the transformer main body and the right side of the transformer main body and the obstacle, so that the cooling effect is improved.
Particularly, the ventilation quantity can be increased by arranging the installation and fixing unit, the heat dissipation effect is improved by combining the installation and fixing unit with the heat dissipation protection unit, the C-shaped groove can be made of stainless steel, eddy current can be effectively reduced by arranging the stainless steel C-shaped groove, the loss of the transformer is reduced, and the conversion effect of the transformer is improved. According to the invention, the installation and fixation unit is arranged, so that the transformer can be conveniently installed and fixed, the problem that the transformer shakes and collapses due to shaking generated in the working process is solved, and the installation effect is enhanced.
Drawings
Fig. 1 is a schematic structural diagram of a 110 kV-class resin-cast insulation transformer of a C-type slot core air passage structure according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a heat dissipation protection unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the mounting and fixing unit according to the embodiment of the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1-3, an embodiment of the present invention provides a 110kV resin cast insulation transformer with a C-type slot core air passage structure, including a transformer main body 1, an installation and fixation unit 3, a heat dissipation protection unit 4, an ultrasonic distance meter, and a central control unit, wherein the installation and fixation unit 3 is disposed below the transformer main body 1, and the heat dissipation protection unit 4 is disposed outside the transformer main body 1.
Specifically, in the embodiment of the present invention, the transformer body 1 is provided with an environment thermometer 5 for measuring an air temperature of an environment in which the transformer body 1 is located, the transformer body 1 is further provided with a transformer top layer oil temperature gauge (not shown) and a transformer winding temperature gauge (not shown) for measuring a top layer oil temperature and a transformer winding temperature of the transformer body 1, respectively, the transformer oil is further provided with an oil level gauge (not shown) for measuring an oil level of the transformer body 1, and the transformer body 1 is further provided with a voltmeter (not shown) and an ammeter (not shown).
Specifically, in the embodiment of the present invention, the transformer top-layer oil temperature gauge may be configured with a temperature measuring groove inserted into the transformer oil at the top of the transformer case, and the temperature measuring element is disposed therein to measure the transformer oil temperature, so as to measure the top-layer oil temperature of the transformer body 1. The invention measures the temperature of the transformer winding through the transformer winding thermometer. The oil level indicator can adopt a glass tube oil level indicator or a magnetic needle oil level indicator, and the invention does not limit the specific temperature measuring mode and the type of the oil level indicator, and the specific implementation is subject to the standard.
Specifically, in the embodiment of the present invention, the mounting and fixing unit 3 is disposed below the transformer main body 1, the mounting and fixing unit 3 includes a first concave block 301, a plurality of mounting holes 302 are formed on a surface of the first concave block 301, a second concave block 303 is disposed above the first concave block 301, and a screw 304 is fixedly connected to an inner wall of the second concave block 303. A rubber pad 305 is fixedly connected to the surface of the second concave block 303, and the size of the rubber pad 305 is matched with that of the second concave block 303. Through the setting of rubber pad 305, can carry out a guard action to pressing from both sides the transformer of pressing from both sides tight in second concave piece 303 inside, the effectual condition of causing the damage of transformer of pressing from both sides tight for a long time of having avoided. The mounting holes 302 and the first concave blocks 301 are in a penetrating structure, and the mounting holes 302 are distributed on the first concave blocks 301 at equal intervals. Through the arrangement of the mounting hole 302, the first concave block 301 can be fixedly mounted, and the mounting efficiency of the transformer is improved. Second concave piece 303 passes through screw rod 304 and first concave piece 301 swing joint, and second concave piece 303 and first concave piece 301 be vertical distribution, through the setting of second concave piece 303, can carry out a fixed chucking's effect for the transformer, has promoted the stability of transformer.
Specifically, the ventilation quantity can be increased by arranging the installation fixing unit 3, the heat dissipation effect is improved by combining the installation fixing unit with the heat dissipation protection unit 4, the C-shaped groove can be made of stainless steel, eddy current can be effectively reduced by arranging the stainless steel C-shaped groove, loss of the transformer is reduced, and the conversion effect of the transformer is improved.
Specifically, in the embodiment of the present invention, the heat dissipation protection unit 4 is disposed outside the transformer body 1, the heat dissipation protection unit 4 includes a protection cover 401, one side of the protection cover 401 is fixedly connected with a hinge 402, the other side of the hinge 402 is fixedly connected with an isolation door 403, the protection cover 401 is provided with a fan, wherein one side of the protection cover 401 is provided with a first fan 404, the other side of the protection cover 401 is provided with a second fan 407, the top of the protection cover 401 is provided with a third fan 408, two sides and the top of the protection cover 401, where the first fan 404 and the second fan 407 are installed, are both provided with a plurality of heat dissipation holes 405, and the inner wall of the protection cover 401 is fixedly provided with a dust screen 406. It can be understood by those skilled in the art that the central control unit is connected to the motors of the first fan 404, the second fan 407, and the third fan 408, respectively, to control the operating states of the first fan 404, the second fan 407, and the third fan 408, where the operating states in this embodiment include the operating direction and the operating speed of the fans, and the rotation of the motors drives the blades of the fans to rotate, so as to dissipate heat inside the transformer, thereby providing a better guarantee for heat dissipation of the transformer.
Specifically, in the embodiment of the present invention, the isolation door 403 is movably connected to the shield 401 through the hinge 402, and the hinge 402 is disposed on a vertical central axis of the isolation door 403, so as to provide a protection and isolation function for the transformer through the shield 401, and the heat dissipation holes 405 and the shield 401 are in a penetrating structure, and the dust-proof mesh 406 is tightly attached to the shield 401, so as to effectively prevent dust from penetrating into the inside through the heat dissipation holes 405 to cause a working failure through the arrangement of the dust-proof mesh 406.
Specifically, in the embodiment of the present invention, the ultrasonic distance meter includes a first ultrasonic distance meter 701, a second ultrasonic distance meter (not shown in the figure), and a third ultrasonic distance meter 703, the first ultrasonic distance meter 701 is disposed on the protection cover 401 corresponding to the first fan 404 for detecting the distance from the left side of the position of the transformer body 1 to the obstacle, the second ultrasonic distance meter is disposed on the protection cover 401 corresponding to the second fan 407 for detecting the distance from the right side of the position of the transformer body 1 to the obstacle, and the third ultrasonic distance meter 703 is disposed on the protection cover 401 corresponding to the third fan 408 for detecting the distance from the obstacle above the position of the transformer body 1. Through the detection to transformer body 1 position distance around, set up the different fortune states of fan through different distances to improve the cooling effect. The person skilled in the art can know that, if the ultrasonic range finder does not detect an obstacle, the central control unit controls the ultrasonic range finder to perform repeated ranging, if neither of the two measurement results detects an obstacle, the central control unit determines that the position of the transformer body 1 is far away from the obstacle in the direction, and the value of the position is Lx which is larger than Lc1, if data are collected in the other directions, the central control unit sets that the data Lx in the direction in which the data are not collected is larger than the data in the direction in which the data are collected, that is, if data are not collected above the transformer body 1, the distance above the transformer body is Lx, the distance between the left side of the transformer body 1 and the obstacle is Lz, and if data are not collected on the right side of the transformer, the distance above the transformer body is equal to the distance on the right side which is larger than the distance on the left side.
Specifically, in the embodiment of the present invention, the central control unit is connected to the voltmeter and the ammeter, and is configured to receive the voltage and the current detected by the voltmeter and the ammeter, the central control unit is connected to the environmental thermometer 5, and is configured to receive the environmental temperature measured by the environmental thermometer 5, the central control unit is connected to the transformer top-layer oil temperature gauge, and is configured to receive the upper-layer temperature of the transformer oil measured by the transformer top-layer oil temperature gauge, the central control unit is connected to the transformer winding temperature gauge, and is configured to receive the transformer winding temperature measured by the transformer winding temperature gauge, the central control unit is connected to the oil level gauge, and is configured to receive the oil level of the transformer body 1, and the central control unit is respectively connected to the first ultrasonic distance meter 701, the second ultrasonic distance meter, and the third ultrasonic distance meter 703, and is configured to receive the first ultrasonic distance meter 701, the second ultrasonic distance meter, the third ultrasonic distance meter 703, the third ultrasonic distance meter, The central control unit is connected to the first fan 404, the second fan 407 and the third fan 408, and is configured to control the operation states of the first fan 404, the second fan 407 and the third fan 408, where the distances from the left obstacle, the right obstacle and the upper obstacle to the transformer body 1, which are measured by the second ultrasonic distance meter and the third ultrasonic distance meter 703.
Specifically, in the embodiment of the present invention, the resin cast insulation layer 2 is fixedly connected to the surface of the transformer body 1, and the size of the resin cast insulation layer 2 is matched with the size of the transformer body 1. Through the arrangement of the resin casting insulating layer 2, a leakage-proof condition can be provided for the transformer body 1.
Specifically, in the embodiment of the present invention, the central control unit calculates an oil temperature reference value according to an oil level height value of the transformer oil and the transformer oil temperature, determines the turned-on fan according to the real-time oil temperature reference value, and determines the operation states of the first fan 404 and the second fan 407 according to data measured by the first ultrasonic range finder 701 and the second ultrasonic range finder if the first fan 404 and the second fan 407 are turned on.
Specifically, in the embodiment of the present invention, if the first fan 404, the second fan 407, and the third fan 408 are turned on, the central control unit compares the distance data measured by the third ultrasonic distance meter 703 with a preset distance reference value, determines the operating state of the third fan 408 if the distance between the transformer body 1 and the obstacle above the transformer body measured in real time is less than or equal to the preset distance reference value, and determines the operating states of the first fan 404 and the second fan 407 according to the data measured by the first ultrasonic distance meter 701 and the second ultrasonic distance meter.
Specifically, in the embodiment of the present invention, if the distance between the transformer body 1 and the obstacle above the transformer body measured in real time is greater than the preset distance reference value, the central control unit calculates the difference between the ambient temperature value measured in real time by the ambient thermometer 5 and the transformer winding temperature measured by the transformer winding temperature table, compares the difference with the preset winding temperature difference, and determines the operating states of the first fan 404, the second fan 407, and the third fan 408 according to the comparison result.
Specifically, in the embodiment of the present invention, the central control unit calculates the load factor of the transformer main body 1 according to data transmitted by the voltmeter and the ammeter in real time, determines the wind speed of the turned-on fan according to the load factor, and adjusts the determined fan wind speed according to the real-time oil temperature reference value, and operates at the adjusted fan wind speed.
Specifically, in the embodiment of the present invention, the central control unit receives the oil level height of the transformer oil measured by the oil level indicator and the upper layer temperature of the transformer oil measured by the transformer top layer oil temperature gauge in real time, and determines the oil temperature reference value according to the real-time oil level height of the transformer oil and the real-time upper layer temperature of the transformer oil, and sets the real-time transformer oil value Yh, the real-time transformer oil temperature Yt, and the oil temperature reference value y, then,
y=Yh/Yh0+Yt/Yt0
wherein y represents an oil temperature reference value, Yh represents a real-time transformer oil level value, Yh0 represents a preset transformer oil level value, Yt represents a real-time transformer oil temperature, and Yt0 represents a preset transformer oil temperature.
Specifically, in the embodiment of the present invention, the preset transformer oil level value Yh0 is set as the highest oil level line of the transformer oil level, and may also be directly set to 20 tons based on the specific type of the transformer, and in the embodiment, the preset transformer oil temperature Yt0 is set to 30 ℃.
Specifically, in the embodiment of the present invention, the central control unit determines the turned-on fan according to the comparison between the oil temperature reference value calculated in real time and the preset oil temperature reference value, sets the first reference value of the oil temperature as Y1, sets the second reference value of the oil temperature as Y2, sets Y1 < Y2,
if Y is less than or equal to Y1, the central control unit determines not to turn on the fan;
if Y is greater than Y1 and less than or equal to Y2, the central control unit determines to turn on the first fan and the second fan;
if Y > Y2, the central control unit determines to turn on the first fan, the second fan and the third fan.
Specifically, in the embodiment of the invention, the opening number of the fans is determined through the oil temperature reference value, the oil temperature reference value is calculated by adopting two parameters of the oil temperature and the oil level, the oil temperature can rise due to thermal expansion when the temperature of the oil is higher, the temperature rise of the transformer oil can be accurately judged by setting the oil temperature reference value, the working environment of the transformer main body can be accurately judged, the opening number of the fans is adjusted, the cooling operation can be specifically carried out, and the cooling effect is improved.
Specifically, in the embodiment of the present invention, the central control unit receives data measured by the first ultrasonic ranging device, the second ultrasonic ranging device, and the third ultrasonic ranging device to determine the operation of the fan, sets the distance between the transformer body measured by the first ultrasonic ranging device and the left obstacle to Lz, the distance between the transformer body measured by the second ultrasonic ranging device and the right obstacle to Ly, the distance between the transformer body measured by the third ultrasonic ranging device and the upper obstacle to Ls, and the distance reference value to Lc1,
when the first fan and the second fan are turned on, the central control unit determines the operation of the first fan and the second fan according to the data measured by the first ultrasonic distance meter and the second ultrasonic distance meter,
if the Lz is larger than or equal to the Ly, the central control unit controls the first fan to rotate to convey the air in the protective cover to the outside of the protective cover, and controls the second fan to rotate to convey the air outside the protective cover to the inside of the protective cover;
if Lz is less than Ly, the central control unit controls the first fan to rotate so as to convey the air outside the protective cover into the protective cover, and controls the second fan to rotate so as to convey the air inside the protective cover out of the protective cover.
Specifically, in the embodiment of the invention, the air intake and exhaust effect of the fan is judged by considering the distance between the left side and the right side of the transformer main body, so that the cooling effect is improved.
Specifically, in the embodiment of the present invention, if the central control unit determines the operation of the first fan, the second fan, and the third fan based on the data measured by the first ultrasonic distance meter, the second ultrasonic distance meter, and the third ultrasonic distance meter when the first fan, the second fan, and the third fan are turned on,
if Ls is less than or equal to Lc1 and Lz is greater than or equal to Ly, the central control unit controls the first fan to rotate to convey the air inside the protective cover to the outside of the protective cover, controls the second fan to rotate to convey the air outside the protective cover to the inside of the protective cover, and controls the third fan to rotate to convey the air outside the protective cover to the inside of the protective cover;
if Ls is less than or equal to Lc1 and Lz is less than Ly, the central control unit controls the first fan to rotate to convey the air outside the protective cover into the protective cover, controls the second fan to rotate to convey the air inside the protective cover out of the protective cover, and controls the third fan to rotate to convey the air outside the protective cover into the protective cover.
Specifically, in the embodiment of the present invention, if three fans are turned on, the operating state of the third fan is determined first, and if the distance from the obstacle above the transformer main body is smaller than a preset value, which indicates that the air is not suitable for exhausting above the transformer main body, the third fan is rotated to convey the air outside the shield into the shield, thereby improving the cooling effect of the fans. And determining the running states of the first fan and the second fan according to the distances between the left side and the right side of the transformer main body and the obstacle.
Specifically, in the embodiment of the present invention, when Ls > Lc1, the central control unit determines operations of the first fan, the second fan, and the third fan according to a difference between an ambient temperature value measured by an ambient thermometer in real time and a transformer winding temperature value measured by a transformer winding temperature table, sets a real-time ambient temperature value to Th, sets a real-time transformer winding temperature value to Tr, sets a first winding temperature difference Tr1, and then,
if Tr-Th is larger than or equal to Tr1, and Lz is larger than or equal to Ly, the central control unit controls the first fan to rotate to convey the air in the protective cover to the outside of the protective cover, controls the second fan to rotate to convey the air outside the protective cover to the inside of the protective cover, and controls the third fan to rotate to convey the air in the protective cover to the outside of the protective cover;
if Tr-Th is larger than or equal to Tr1 and Lz is smaller than Ly, the central control unit controls the first fan to rotate to convey air outside the protective cover into the protective cover, controls the second fan to rotate to convey air inside the protective cover out of the protective cover, and controls the third fan to rotate to convey air inside the protective cover out of the protective cover;
if Tr-Th is less than Tr1, the central control unit controls the first fan to rotate to convey the air outside the shield into the shield, controls the second fan to rotate to convey the air outside the shield into the shield, and controls the third fan to rotate to convey the air inside the shield out of the shield.
Specifically, in the embodiment of the present invention, if the distance from the obstacle above the transformer main body is greater than the preset value, the central control unit preferentially sets the operating state of the third fan to be that the third fan rotates to convey the air in the protective cover to the outside of the protective cover, and then determines the operating states of the first fan and the second fan according to the difference between the real-time measured ambient temperature value and the temperature of the transformer winding and the distance from the left side and the right side of the transformer main body to the obstacle.
Specifically, in the embodiment of the present invention, the central control unit calculates the load factor of the transformer main body according to the data transmitted by the voltmeter and the ammeter in real time, and determines the wind speed of the fan according to the load factor. Setting the real-time load rate of the transformer body to be Zs, setting a first load reference value Z1 of the transformer body, setting a second load reference value Z2 of the transformer body, and setting a third load reference value Z3 of the transformer body, wherein Z1 < Z2 < Z3. The first preset wind speed of the fan is set to be V1, the second preset wind speed of the fan is set to be V2, the third preset wind speed of the fan is set to be V3, the fourth preset wind speed of the fan is set to be V4, and V1 is more than V2 and more than V3 and more than V4.
Specifically, in the embodiment of the present invention, the wind speed of the fan is determined by the central control unit,
if Zs is less than or equal to Z1, the central control unit determines that the wind speed of the opened fan is V1;
if Z1 is larger than Zs and smaller than or equal to Z2, the central control unit determines that the wind speed of the opened fan is V2;
if Z2 is larger than Zs and smaller than or equal to Z3, the central control unit determines that the wind speed of the opened fan is V3;
if Zs > Z3, the central control unit determines the wind speed of the opened fan to be V4.
Specifically, in the embodiment of the present invention, the wind speed of the fan is determined by the height of the load factor of the transformer main body, and as will be known to those skilled in the art, the higher the load factor is, the higher the degree of the requirement of the transformer main body for cooling is, in the present embodiment, the load reference value may be determined according to an actual situation, in the present embodiment, the value of Z1 is set to be 30%, the value of Z2 is set to be 60%, the value of Z3 is set to be 90%, and the wind speed of the fan may be determined according to the performance of the fan.
Specifically, in the embodiment of the present invention, the central control unit adjusts the wind speed of the fan according to the real-time oil temperature reference value, sets the real-time wind speed of the fan Vi, sets i =1, 2, 3, 4,
if Y is less than or equal to Y1, the central control unit does not adjust the wind speed of the fan;
if Y is greater than Y1 and less than or equal to Y2, the central control unit adjusts the wind speed of the fan to be Vx, and Vx = V (i + 1);
if Y is more than Y2, the central control unit adjusts the wind speed of the fan to be V4.
Specifically, in the embodiment of the present invention, when the adjusted Vx is greater than V4, the adjusted fan speed is V4. In the embodiment, the determined wind speed is adjusted through the oil temperature reference value, and the wind speed of the fan is adjusted through the oil temperature reference value obtained by combining the oil temperature and the oil level which are about to be real-time. In this embodiment, the minimum wind speed of the fan is set to be V1, the maximum wind speed of the fan is set to be V4, the fan referred to herein refers to the first fan, the second fan and the third fan, and in this embodiment, the first fan, the second fan and the third fan are all fans of the same model.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A110 kV resin casting insulation transformer with a C-shaped groove iron core air passage structure is characterized by comprising,
the transformer comprises a transformer main body, a temperature sensor, a voltage meter and an ammeter, wherein the transformer main body is provided with an environment thermometer for measuring the air temperature of the environment where the transformer main body is located;
the mounting and fixing unit is arranged below the transformer main body and comprises a first concave block, a plurality of mounting holes are formed in the surface of the first concave block, a second concave block is arranged above the first concave block, and a screw rod is fixedly connected to the inner wall of the second concave block;
the heat dissipation protection unit is arranged on the outer side of the transformer main body and comprises a protection cover, one side of the protection cover is fixedly connected with a hinge, the other side of the hinge is fixedly connected with an isolation door, and a fan is arranged on the protection cover;
the ultrasonic distance measuring device comprises a first ultrasonic distance measuring device, a second ultrasonic distance measuring device and a third ultrasonic distance measuring device, wherein the first ultrasonic distance measuring device is arranged on a protective cover corresponding to a first fan and used for detecting the distance between the left side of the position of the transformer main body and the obstacle, the second ultrasonic distance measuring device is arranged on the protective cover corresponding to the second fan and used for detecting the distance between the right side of the position of the transformer main body and the obstacle, and the third ultrasonic distance measuring device is arranged on the protective cover corresponding to a third fan and used for detecting the distance between the upper side of the position of the transformer main body and the obstacle;
the central control unit is connected with the voltmeter and the ammeter and used for receiving the voltage and the current detected by the voltmeter and the ammeter, the central control unit is connected with the environment thermometer and used for receiving the environment temperature measured by the environment thermometer, the central control unit is connected with the transformer top layer oil temperature meter and used for receiving the upper layer temperature of the transformer oil measured by the transformer top layer oil temperature meter, the central control unit is connected with the transformer winding temperature meter and used for receiving the transformer winding temperature measured by the transformer winding temperature meter, the central control unit is connected with the oil level meter and used for receiving the oil level height of the transformer main body, the central control unit is respectively connected with the first ultrasonic range finder, the second ultrasonic range finder and the third ultrasonic range finder and used for receiving obstacles, measured by the first ultrasonic range finder, the second ultrasonic range finder and the third ultrasonic range finder, of which are located at the left side of the transformer main body, The central control unit is connected with the first fan, the second fan and the third fan and used for controlling the running states of the first fan, the second fan and the third fan;
the central control unit calculates an oil temperature reference value according to the oil level height value of the transformer oil and the transformer oil temperature, determines the opened fan according to the real-time oil temperature reference value, and determines the running states of the first fan and the second fan according to data measured by the first ultrasonic distance meter and the second ultrasonic distance meter if the first fan and the second fan are opened;
if the first fan, the second fan and the third fan are turned on, the central control unit compares distance data measured by the third ultrasonic distance meter with a preset distance reference value, determines the running state of the third fan if the distance between the transformer main body and an obstacle above the transformer main body measured in real time is smaller than or equal to the preset distance reference value, and determines the running states of the first fan and the second fan according to the data measured by the first ultrasonic distance meter and the second ultrasonic distance meter;
if the distance between the transformer main body and the obstacle above the transformer main body, which is measured in real time, is larger than a preset distance reference value, the central control unit calculates the difference value between the environment temperature value measured in real time by the environment thermometer and the transformer winding temperature measured by the transformer winding thermometer, compares the difference value with the preset winding temperature difference value, and determines the running states of the first fan, the second fan and the third fan according to the comparison result;
the central control unit calculates the load rate of the transformer main body according to data transmitted by the voltmeter and the ammeter in real time, determines the wind speed of the opened fan according to the load rate, adjusts the determined fan wind speed according to the real-time oil temperature reference value, and operates according to the adjusted fan wind speed.
2. The 110kV resin-cast insulation transformer with a C-type slot core air channel structure according to claim 1, wherein the central control unit receives the oil level height of the transformer oil measured by the oil level indicator and the upper layer temperature of the transformer oil measured by the transformer top oil temperature gauge in real time, and determines an oil temperature reference value according to the real oil level height of the transformer oil and the upper layer temperature of the transformer oil, and sets a real-time transformer oil level value Yh, a real-time transformer oil temperature Yt, and an oil temperature reference value y,
y=Yh/Yh0+Yt/Yt0
wherein y represents an oil temperature reference value, Yh represents a real-time transformer oil level value, Yh0 represents a preset transformer oil level value, Yt represents a real-time transformer oil temperature, and Yt0 represents a preset transformer oil temperature.
3. The 110kV resin-cast insulation transformer of a C-type slot core air channel structure as claimed in claim 2, wherein the central control unit determines the fan to be turned on by comparing a reference value of oil temperature calculated in real time with a preset reference value of oil temperature, setting a first reference value of oil temperature to Y1, setting a second reference value of oil temperature to Y2, setting Y1 < Y2,
if Y is less than or equal to Y1, the central control unit determines not to turn on the fan;
if Y is greater than Y1 and less than or equal to Y2, the central control unit determines to turn on the first fan and the second fan;
if Y > Y2, the central control unit determines to turn on the first fan, the second fan and the third fan.
4. The 110kV resin-cast insulation transformer of a C-type slot core air channel structure as claimed in claim 3, wherein the central control unit receives data measured by the first, second and third ultrasonic distance meters to determine the operation of the fan, sets the distance between the transformer body measured by the first ultrasonic distance meter and the left-side obstacle as Lz, the distance between the transformer body measured by the second ultrasonic distance meter and the right-side obstacle as Ly, the distance between the transformer body measured by the third ultrasonic distance meter and the upper obstacle as Ls, and the distance reference value as Lc1, then,
when the first fan and the second fan are turned on, the central control unit determines the operation of the first fan and the second fan according to the data measured by the first ultrasonic distance meter and the second ultrasonic distance meter,
if the Lz is larger than or equal to the Ly, the central control unit controls the first fan to rotate to convey the air in the protective cover to the outside of the protective cover, and controls the second fan to rotate to convey the air outside the protective cover to the inside of the protective cover;
if Lz is less than Ly, the central control unit controls the first fan to rotate so as to convey the air outside the protective cover into the protective cover, and controls the second fan to rotate so as to convey the air inside the protective cover out of the protective cover.
5. The 110kV resin-cast insulation transformer with a C-type slot core air channel structure according to claim 4, wherein if the first fan, the second fan and the third fan are turned on, the central control unit determines the operation of the first fan, the second fan and the third fan according to the data measured by the first ultrasonic distance meter, the second ultrasonic distance meter and the third ultrasonic distance meter,
if Ls is less than or equal to Lc1 and Lz is greater than or equal to Ly, the central control unit controls the first fan to rotate to convey the air inside the protective cover to the outside of the protective cover, controls the second fan to rotate to convey the air outside the protective cover to the inside of the protective cover, and controls the third fan to rotate to convey the air outside the protective cover to the inside of the protective cover;
if Ls is less than or equal to Lc1 and Lz is less than Ly, the central control unit controls the first fan to rotate to convey the air outside the protective cover into the protective cover, controls the second fan to rotate to convey the air inside the protective cover out of the protective cover, and controls the third fan to rotate to convey the air outside the protective cover into the protective cover.
6. The 110kV resin-cast insulation transformer of a C-type slot core airway structure according to claim 5, wherein when Ls > Lc1, the central control unit determines the operation of the first fan, the second fan and the third fan according to the difference between the ambient temperature value measured by an ambient thermometer in real time and the transformer winding temperature measured by a transformer winding temperature table, sets the real-time ambient temperature value as Th, sets the real-time transformer winding temperature value as Tr, sets the first winding temperature difference Tr1,
if Tr-Th is larger than or equal to Tr1, and Lz is larger than or equal to Ly, the central control unit controls the first fan to rotate to convey the air in the protective cover to the outside of the protective cover, controls the second fan to rotate to convey the air outside the protective cover to the inside of the protective cover, and controls the third fan to rotate to convey the air in the protective cover to the outside of the protective cover;
if Tr-Th is larger than or equal to Tr1 and Lz is smaller than Ly, the central control unit controls the first fan to rotate to convey air outside the protective cover into the protective cover, controls the second fan to rotate to convey air inside the protective cover out of the protective cover, and controls the third fan to rotate to convey air inside the protective cover out of the protective cover;
if Tr-Th is less than Tr1, the central control unit controls the first fan to rotate to convey the air outside the shield into the shield, controls the second fan to rotate to convey the air outside the shield into the shield, and controls the third fan to rotate to convey the air inside the shield out of the shield.
7. The 110 kV-level resin-cast insulation transformer with the C-shaped groove core air flue structure as claimed in claim 6, wherein the central control unit calculates the load rate of the transformer main body according to data transmitted by a voltmeter and an ammeter in real time, and determines the wind speed of the fan according to the load rate;
setting the real-time load rate of the transformer body as Zs, setting a first load reference value Z1 of the transformer body, setting a second load reference value Z2 of the transformer body, and setting a third load reference value Z3 of the transformer body, wherein Z1 is more than Z2 and more than Z3;
the first preset wind speed of the fan is set to be V1, the second preset wind speed of the fan is set to be V2, the third preset wind speed of the fan is set to be V3, the fourth preset wind speed of the fan is set to be V4, and V1 is more than V2 and more than V3 and more than V4.
8. The 110kV resin-cast insulation transformer with a C-type slot core air channel structure as claimed in claim 7, wherein the wind speed of the fan is determined by the central control unit,
if Zs is less than or equal to Z1, the central control unit determines that the wind speed of the opened fan is V1;
if Z1 is larger than Zs and smaller than or equal to Z2, the central control unit determines that the wind speed of the opened fan is V2;
if Z2 is larger than Zs and smaller than or equal to Z3, the central control unit determines that the wind speed of the opened fan is V3;
if Zs > Z3, the central control unit determines the wind speed of the opened fan to be V4.
9. The 110kV resin-cast insulation transformer with a C-shaped groove core air flue structure as claimed in claim 8, wherein the central control unit adjusts the wind speed of the fan according to a real-time oil temperature reference value, the real-time wind speed of the fan is set to Vi, i =1, 2, 3, 4 is set,
if Y is less than or equal to Y1, the central control unit does not adjust the wind speed of the fan;
if Y is greater than Y1 and less than or equal to Y2, the central control unit adjusts the wind speed of the fan to be Vx, and Vx = V (i + 1);
if Y is more than Y2, the central control unit adjusts the wind speed of the fan to be V4;
and when the adjusted Vx is larger than V4, taking V4 as the adjusted fan speed.
10. The 110 kV-level resin-cast insulation transformer with the C-shaped groove core airway structure according to claim 1, wherein a resin-cast insulation layer is fixedly connected to the surface of the transformer main body, and the size of the resin-cast insulation layer is matched with that of the transformer main body;
the mounting holes and the first concave block are of a penetrating structure, and the mounting holes are distributed on the first concave block at equal intervals; the second concave block is movably connected with the first concave block through a screw rod, and the second concave block and the first concave block are vertically distributed.
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| CN110797167A (en) * | 2019-10-28 | 2020-02-14 | 江苏蜀铭电气设备有限公司 | Oil-immersed transformer based on cooling protection device |
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