Natural ester transformer bushing for high altitude low temperature

Abstract

The utility model discloses a natural ester transformer bushing for high altitude low temperature relates to transformer bushing technical field, include: conducting pole, porcelain bush, high voltage wiring copper sheet, voltage -sharing ball, conducting pole sets up in the inside of porcelain bush, and the annular area formed in conducting pole and porcelain bush is provided with oil -immersed paper insulation system, and the inside of oil -immersed paper insulation system is used for filling natural ester insulating oil, and is used for arranging multilayer aluminum foil electrode, the top of conducting pole is connected with high voltage wiring copper sheet, and the bottom is connected with voltage -sharing ball, the bottom of porcelain bush is provided with sealed wiring cavity, and the outside of oil -immersed paper insulation system is wound with electric heating band, and electric heating band leads out to control unit from sealed wiring cavity through electric heating band wire, the outside of oil -immersed paper insulation system is provided with electric heating band in the utility model, and leads out in cooperation sealed wiring cavity, can heat natural ester insulating oil in oil -immersed paper insulation system, has improved the adaptability of transformer bushing under high altitude low temperature.

Description

Technical Field

[0001] This application relates to the field of transformer bushing technology, and in particular to natural ester transformer bushings for high-altitude and low-temperature applications. Background Technology

[0002] In high-altitude areas, low air pressure reduces the dielectric strength of the insulating medium, while drastic diurnal temperature variations can cause thermal expansion and contraction of the bushing material, accelerating seal aging. Simultaneously, low temperatures significantly reduce the fluidity of natural ester insulating oil, even causing a sharp increase in viscosity, weakening the insulation performance and heat dissipation capacity of oil-impregnated paper insulation systems, and potentially leading to partial discharge, insulation breakdown, and other faults in severe cases. Therefore, research is needed on natural ester transformer bushings for high-altitude, low-temperature applications.

[0003] In the prior art, Chinese patent CN222126256U discloses a natural ester insulating oil transformer bushing. The technical solution is as follows: an oil-paper insulation system is provided in the annular area formed by the conductive rod and the porcelain bushing. The oil-paper insulation system is filled with natural ester insulating oil and arranged with multiple layers of aluminum foil electrodes. The top of the conductive rod is connected to the high-voltage terminal copper plate, which is connected to the high-voltage transmission line. The bottom of the conductive rod is connected to the equalizing ball, which is connected to the winding lead-out device. The bottom of the porcelain bushing is provided with a final screen test connection port, which is connected to the testing equipment. The bottom of the porcelain bushing is also provided with a venting bolt.

[0004] However, the aforementioned existing technologies have not considered or solved the above problems, and their adaptability at high altitudes and low temperatures is poor. Utility Model Content

[0005] This application provides natural ester transformer bushings for high-altitude and low-temperature applications, in order to solve the problem of poor adaptability of existing transformer bushing technology at high altitudes and low temperatures.

[0006] On the one hand, this application provides a natural ester transformer bushing for high-altitude low-temperature applications, including: a conductive rod, a porcelain bushing, a high-voltage wiring copper plate, and an equalizing ball.

[0007] The conductive rod is disposed inside the ceramic sleeve, and an oil-impregnated paper insulation system is disposed within the annular area formed by the conductive rod and the ceramic sleeve. The interior of the oil-impregnated paper insulation system is used to fill natural ester insulating oil and to arrange multi-layer aluminum foil electrodes.

[0008] The top end of the conductive rod is connected to the high-voltage wiring copper plate, and the bottom end is connected to the equalizing ball.

[0009] The bottom of the porcelain sleeve is provided with a sealed wiring cavity, and an electric heating tape is wound around the outside of the oil-impregnated paper insulation system. The electric heating tape is led out from the sealed wiring cavity to the control unit through an electric heating tape wire.

[0010] In one possible implementation, a plurality of temperature sensors are embedded inside the oil-impregnated paper insulation system, and the temperature sensors are led out from the sealed wiring cavity to the control unit via temperature sensor wires.

[0011] In one possible implementation, the interior of the sealed wiring cavity is filled with a low-temperature sealant.

[0012] In one possible implementation, the bottom of the ceramic sleeve is provided with a terminal screen test connection port, which is connected to a gas concentration detection device.

[0013] The bottom of the ceramic sleeve is also equipped with a venting bolt.

[0014] In one possible implementation, an oil cushion is provided on the top of the ceramic sleeve.

[0015] In one possible implementation, an insulating oil sampling valve is provided at the bottom of the ceramic sleeve.

[0016] In one possible implementation, the outer side of the ceramic sleeve is covered with a layer of insulating material.

[0017] In one possible implementation, the outer side of the insulation material layer is covered with a hydrophobic anti-icing coating.

[0018] The natural ester transformer bushing for high-altitude, low-temperature applications in this application has the following advantages: By installing an electric heating strip on the outside of the oil-impregnated paper insulation system and leading it out from the sealed wiring cavity, the natural ester insulating oil in the oil-impregnated paper insulation system can be heated, improving the adaptability of the transformer bushing at high altitudes and low temperatures.

[0019] The proposed oil-impregnated paper insulation system has several temperature sensors embedded inside. The temperature sensors are led out from the sealed wiring cavity to the control unit through temperature sensor wires, providing temperature information for heating the natural ester insulating oil and improving heating reliability.

[0020] The proposed sealed wiring cavity is filled with low-temperature sealant, which enhances the sealing performance and prevents low-temperature and humid air from entering the porcelain sleeve through the sealed wiring cavity.

[0021] The outer side of the ceramic sleeve is covered with a layer of heat-insulating material, which reduces the loss of internal heat to the outside.

[0022] The outer side of the proposed insulation material layer is covered with a hydrophobic anti-icing coating, which can prevent external ice and snow from adhering to the surface and avoid ice and snow covering from affecting the insulation effect or increasing the load on the ceramic sleeve. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the cross-sectional structure of a natural ester transformer bushing for high-altitude low-temperature applications provided in this application embodiment; Figure 2 This is a schematic diagram of the main structure of a natural ester transformer bushing for high-altitude low-temperature applications provided in an embodiment of this application. Figure 3 This is an enlarged cross-sectional structural diagram of the ceramic sleeve provided in the embodiments of this application; Explanation of reference numerals in the attached figures: 1-Conductive rod, 2-Porcelain sleeve, 3-High voltage wiring copper plate, 4-Equalizing ball, 5-Oil conservator, 6-Sealed wiring cavity, 61-Electric heating band, 62-Temperature sensor, 611-Electric heating band wire, 621-Temperature sensor wire, 7-End screen test connection port, 8-Vent bolt, 9-Insulating oil sampling valve, 21-Insulation material layer, 22-Hydrophobic anti-icing coating. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] like Figure 1 and Figure 2 As shown in the embodiment of this application, a natural ester transformer bushing for high-altitude low-temperature applications is provided, comprising: a conductive rod 1, a porcelain bushing 2, a high-voltage wiring copper plate 3, and an equalizing ball 4.

[0027] The conductive rod 1 is disposed inside the ceramic sleeve 2. An oil-impregnated paper insulation system is disposed within the annular area formed by the conductive rod 1 and the ceramic sleeve 2. The interior of the oil-impregnated paper insulation system is used to fill natural ester insulating oil and to arrange multi-layer aluminum foil electrodes.

[0028] The top end of the conductive rod 1 is connected to the high-voltage wiring copper plate 3, and the bottom end is connected to the equalizing ball 4.

[0029] The bottom of the porcelain sleeve 2 is provided with a sealed wiring cavity 6, and an electric heating tape 61 is wound around the outside of the oil-impregnated paper insulation system. The electric heating tape 61 is led out from the sealed wiring cavity 6 to the control unit through an electric heating tape wire 611.

[0030] Specifically, in this embodiment, the interior of the oil-impregnated paper insulation system is filled with natural ester insulating oil, which serves to insulate and cool the conductive rod 1. Multiple layers of aluminum foil electrodes are arranged inside the oil-impregnated paper insulation system to form a series capacitor, which is used to dominate the overall voltage division and balance the electric field distribution. The high-voltage connecting copper plate 3 is connected to the high-voltage transmission line. The equalizing ball 4 is connected to the winding lead-out device to form a current path, used to smooth the electric field distribution at the ends.

[0031] In this embodiment, the control unit is a microcontroller, which can control the heating of the electric heating strip 61 through circuitry. The specific model of the control unit is a conventional choice in the art and is not limited here. In other possible embodiments, an integrated circuit capable of implementing heating control functions can also be used.

[0032] For example, a plurality of temperature sensors 62 are embedded inside the oil-impregnated paper insulation system, and the temperature sensors 62 are led out from the sealed wiring cavity 6 to the control unit through temperature sensor wires 621.

[0033] Specifically, in this embodiment, the temperature sensor 62 is a PT100 platinum resistance temperature sensor, and three sets are set up, located at the upper, middle, and lower parts of the oil-impregnated paper insulation system, respectively. In this embodiment, when the control unit detects through the temperature sensor 62 that the temperature at any location is lower than a preset heating temperature threshold, the control unit controls the electric heating belt 61 to heat the oil-impregnated paper insulation system until the temperature at each location is higher than the preset heating temperature threshold, and then stops heating. In another possible embodiment, when the control unit detects through the temperature sensor 62 that the average temperature collected by all temperature sensors 62 is lower than the preset heating temperature threshold, the control unit controls the electric heating belt 61 to heat the oil-impregnated paper insulation system until the average temperature is higher than the preset heating temperature threshold, and then stops heating. In other possible embodiments, the control unit can also be configured to control the heating in other ways.

[0034] For example, the interior of the sealed wiring cavity 6 is filled with low-temperature sealant.

[0035] Specifically, in this embodiment, silicone sealant is used as the low-temperature sealant. In other possible embodiments, other low-temperature sealant materials may also be used.

[0036] For example, the bottom of the ceramic sleeve 2 is provided with a terminal screen test connection port 7, and the terminal screen test connection port 7 is connected to a gas concentration detection device.

[0037] The bottom of the ceramic sleeve 2 is also provided with a venting bolt 8.

[0038] Specifically, in this embodiment, the gas concentration detection device adopts existing detection equipment in the art, which can detect the gas concentration inside the ceramic sleeve 2. When the gas concentration inside the ceramic sleeve 2 is detected to be greater than the preset concentration threshold, the gas concentration detection device will send a signal, at which time the gas can be discharged through the vent bolt 8.

[0039] For example, an oil pillow 5 is provided on the top of the ceramic sleeve 2.

[0040] Specifically, the oil conservator 5 is used to control the oil level of the natural ester insulating oil in the porcelain bushing 2, ensuring sufficient oil and providing a reliable insulation and cooling environment.

[0041] For example, an insulating oil sampling valve 9 is provided at the bottom of the porcelain sleeve 2.

[0042] Specifically, in this embodiment, an insulating oil sampling valve 9 is provided to facilitate the sampling of a small amount of natural ester insulating oil for testing during inspections and in the event of a fault, in order to help determine the cause of the fault.

[0043] like Figure 3 As shown, exemplarily, the outer side of the ceramic sleeve 2 is covered with a thermal insulation material layer 21.

[0044] Specifically, in this embodiment, the insulation material layer 21 is made of aerogel felt, which reduces the loss of internal heat from the ceramic sleeve 2 to the outside.

[0045] For example, the outer side of the thermal insulation material layer 21 is covered with a hydrophobic anti-icing coating 22.

[0046] Specifically, in this embodiment, the hydrophobic anti-icing coating 22 is a nano-silica modified fluorocarbon coating, which can block external ice and snow from adhering to the surface, and avoid ice and snow covering from affecting the heat preservation effect or increasing the load on the ceramic sleeve 2.

[0047] This embodiment of the application provides an electric heating band 61 on the outside of the oil-impregnated paper insulation system, which is led out in conjunction with the sealed wiring cavity 6. This allows for the heating of the natural ester insulating oil in the oil-impregnated paper insulation system, thereby improving the adaptability of the transformer bushing at high altitudes and low temperatures.

[0048] The proposed oil-impregnated paper insulation system has several temperature sensors 62 embedded inside. The temperature sensors 62 are led out from the sealed wiring cavity 6 to the control unit through temperature sensor wires 621, providing temperature information for heating the natural ester insulating oil and improving heating reliability.

[0049] The proposed sealed wiring cavity 6 is filled with low-temperature sealant, which enhances the sealing performance and prevents low-temperature and humid air from entering the porcelain sleeve through the sealed wiring cavity 6.

[0050] The outer side of the ceramic sleeve 2 is covered with a thermal insulation material layer 21, which reduces the loss of internal heat from the ceramic sleeve 2 to the outside.

[0051] The outer side of the proposed insulation material layer 21 is covered with a hydrophobic anti-icing coating 22, which can prevent external ice and snow from adhering to the surface and avoid ice and snow covering from affecting the insulation effect or increasing the load on the ceramic sleeve 2.

[0052] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0053] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A natural ester transformer bushing for high-altitude, low-temperature applications, characterized in that, include: Conductive rod, porcelain sleeve, high-voltage wiring copper plate, equalizing ball; The conductive rod is disposed inside the ceramic sleeve, and an oil-impregnated paper insulation system is disposed within the annular area formed by the conductive rod and the ceramic sleeve. The interior of the oil-impregnated paper insulation system is used to fill natural ester insulating oil and to arrange multi-layer aluminum foil electrodes. The top end of the conductive rod is connected to the high-voltage wiring copper plate, and the bottom end is connected to the equalizing ball; The bottom of the porcelain sleeve is provided with a sealed wiring cavity, and an electric heating tape is wound around the outside of the oil-impregnated paper insulation system. The electric heating tape is led out from the sealed wiring cavity to the control unit through an electric heating tape wire.

2. The natural ester transformer bushing for high-altitude low-temperature applications according to claim 1, characterized in that, The oil-impregnated paper insulation system has several temperature sensors embedded inside, and the temperature sensors are led out from the sealed wiring cavity to the control unit through temperature sensor wires.

3. The natural ester transformer bushing for high-altitude low-temperature applications according to claim 1, characterized in that, The interior of the sealed wiring cavity is filled with low-temperature sealant.

4. The natural ester transformer bushing for high-altitude low-temperature applications according to claim 1, characterized in that, The bottom of the ceramic sleeve is provided with a terminal screen test connection port, which is connected to a gas concentration detection device. The bottom of the ceramic sleeve is also equipped with a venting bolt.

5. The natural ester transformer bushing for high-altitude low-temperature applications according to claim 1, characterized in that, An oil cushion is provided at the top of the ceramic sleeve.

6. The natural ester transformer bushing for high-altitude low-temperature applications according to claim 1, characterized in that, An insulating oil sampling valve is provided at the bottom of the porcelain bushing.

7. The natural ester transformer bushing for high-altitude low-temperature applications according to claim 1, characterized in that, The outer side of the ceramic sleeve is covered with a layer of thermal insulation material.

8. The natural ester transformer bushing for high-altitude low-temperature applications according to claim 7, characterized in that, The outer side of the insulation material layer is covered with a hydrophobic anti-icing coating.

Images