Current transformer

Abstract

The embodiment of the utility model provides a current transformer, and relates to the technical field of transformers. The current transformer comprises a sleeve, an oil conservator is installed on the surface of the sleeve, a winding component is installed in an inner cavity of the oil conservator, a shielding cover is jointly installed in an inner cavity of the sleeve and an inner cavity of the winding component, and a cooling assembly is arranged at the bottom of the sleeve. The working purpose of circularly recycling cooling liquid for cooling the current transformer is achieved, so that the temperature of the cooling liquid can be continuously reduced, internal parts of the current transformer are cooled, the cooling efficiency of the current transformer is improved, and the service life of the current transformer is prolonged. And a user does not need to replace the cooling liquid for use for a long time, so that time and labor are saved, the workload of the user is reduced, the working efficiency of the current transformer is improved, and the current transformer is convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of mutual inductors, in particular to a current mutual inductor. Background Art

[0002] Current transformers have the function of converting large currents into small currents in power system's energy metering, relay protection, automatic control and other devices. The reliability of their operation is of great significance to the safe operation of the entire power system.

[0003] When the existing current transformer is working, it can only be immersed in cooling liquid for a long time to dissipate heat. As a result, during long-term operation, the heat generated by the internal parts of the current transformer gradually merges with the cooling liquid, causing the temperature of the cooling liquid to gradually increase. Therefore, the working purpose of the cooling liquid to dissipate heat for the internal parts of the current transformer is gradually reduced, so the user needs to constantly replace the cooling liquid to re-immerse the current transformer, which is time-consuming and labor-intensive, increases the user's workload, and increases the load on the current transformer during operation, making it inconvenient to use. Therefore, we propose a current transformer with easy-to-use functions, which is urgently needed to be developed. Utility Model Content

[0004] The utility model aims to provide a current transformer, which can avoid the problem that the existing current transformer can only be immersed in cooling liquid for a long time to dissipate heat during operation, resulting in the heat generated by the internal parts of the current transformer gradually merging with the cooling liquid during long-term operation, causing the temperature of the cooling liquid to gradually increase, thereby gradually reducing the working purpose of the cooling liquid for dissipating the heat of the internal parts of the current transformer, thereby requiring the user to constantly replace the cooling liquid to re-immerse the current transformer, which is time-consuming and labor-intensive, increases the workload of the user, and increases the load on the current transformer during operation, making it inconvenient to use.

[0005] The utility model provides a current transformer, comprising a bushing, an oil conservator is installed on the surface of the bushing, a winding component is installed in the inner cavity of the oil conservator, a shielding cover is installed in the inner cavity of the bushing and the inner cavity of the winding component, and a cooling component is arranged at the bottom of the bushing.

[0006] In a specific implementation, a capacitor screen sleeve is installed in the inner cavity of the shielding cover, an expander is installed on the top of the oil storage cabinet, and two symmetrically arranged terminals are installed on the surface of the oil storage cabinet.

[0007] In a specific embodiment, the cooling assembly includes an oil injection storage box connected to the sleeve, and the bottom of the sleeve is connected to a circulation pump.

[0008] In a specific embodiment, the inner cavity of the oil filling storage box is rotatably connected to a rotating rod, and the surface of the rotating rod is connected to turbine blades.

[0009] In a specific embodiment, the outer surface of the oil filling storage box is connected to a mounting box, and one end of the rotating rod away from the oil filling storage box penetrates into the inner cavity of the mounting box.

[0010] In a specific embodiment, a connecting rod is rotatably connected in the inner cavity of the installation box, and two pulleys are respectively sleeved on the surface of the connecting rod and the surface of the rotating rod.

[0011] In a specific embodiment, a running rod is provided through the bottom of the inner cavity of the oil filling storage box, and two bevel gears are respectively connected to the bottom end of the running rod and the surface of the connecting rod, and the two bevel gears are meshed with each other.

[0012] In a specific embodiment, the surface of the operating rod is connected to a fan blade, and the inner cavity of the oil filling storage box is connected to a heat dissipation component.

[0013] In a specific embodiment, the outer surface of the oil filling storage box is connected to a feed pipe, and the bottom of the oil filling storage box is provided with an air inlet hole.

[0014] In a specific embodiment, the bottom of the sleeve is connected to a base, and the surface of the sleeve is installed with an outlet box.

[0015] The beneficial effect of the present application is that: through the setting of the cooling component, the cooling liquid for dissipating heat from the current transformer is circulated and recovered for cooling and heat dissipation, so that the cooling liquid can continuously lower its own temperature, thereby dissipating heat from the internal parts of the current transformer, improving the heat dissipation efficiency of the current transformer, and eliminating the need for the user to replace the cooling liquid for a long time, thereby saving time and effort, reducing the user's workload, improving the working efficiency of the current transformer, and facilitating use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a three-dimensional schematic diagram of the overall structure of an embodiment of the utility model;

[0018] Figure 2It is a perspective schematic diagram of the side cross-sectional structure of the oil storage cabinet according to an embodiment of the utility model;

[0019] Figure 3 This is a three-dimensional schematic diagram of the casing structure when viewed from the bottom in an embodiment of the utility model;

[0020] Figure 4 A three-dimensional schematic diagram of the circulation pump structure of an embodiment of the utility model;

[0021] Figure 5 It is a perspective schematic diagram of the side cross-sectional structure of the oil filling storage box according to an embodiment of the utility model;

[0022] Figure 6 It is a three-dimensional schematic diagram of the air intake hole structure of an embodiment of the utility model.

[0023] Icons: 1. Bushing; 2. Oil storage cabinet; 3. Winding components; 4. Shielding cover; 5. Capacitor screen bushing; 6. Expander; 7. Terminal; 8. Base; 9. Terminal box; 10. Cooling assembly; 101. Oil filling storage box; 102. Circulating pump; 103. Rotating rod; 104. Turbine blades; 105. Mounting box; 106. Connecting rod; 107. Running rod; 108. Bevel gear; 109. Fan blade; 110. Heat dissipation component; 111. Feed pipe; 112. Air inlet; 113. Pulley. DETAILED DESCRIPTION

[0024] It can avoid the problem that the existing current transformer can only be immersed in cooling liquid for a long time to dissipate heat during operation, resulting in the heat generated by the internal parts of the current transformer gradually merging with the cooling liquid during long-term operation, causing the temperature of the cooling liquid to gradually increase, thereby gradually reducing the working purpose of the cooling liquid to dissipate the internal parts of the current transformer, so that the user needs to constantly replace the cooling liquid to re-immerse the current transformer, which is time-consuming and labor-intensive, increases the user's workload, and increases the load of the current transformer during operation, making it inconvenient to use. Therefore, the inventor provides a current transformer after research, which, through the setting of a cooling component, plays the working purpose of recycling and cooling the cooling liquid for the heat dissipation of the current transformer, so that the cooling liquid can continuously reduce its own temperature, thereby dissipating the heat of the internal parts of the current transformer, improving the heat dissipation efficiency of the current transformer, and eliminating the need for the user to replace the cooling liquid for a long time, saving time and labor, reducing the user's workload, improving the working efficiency of the current transformer, and facilitating use, thereby solving the above-mentioned defects.

[0025] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] Please refer to Figures 1 to 6 The embodiment of the utility model provides a current transformer, including a bushing 1, an oil conservator 2 is installed on the surface of the bushing 1, a winding component 3 is installed in the inner cavity of the oil conservator 2, wherein the winding component 3 is preferably a secondary winding part, and the function of the secondary winding is to supply the winding of the current loop power supply of the measuring instrument, meter, relay or other similar electrical appliances, and a shielding cover 4 is installed in the inner cavity of the bushing 1 and the inner cavity of the winding component 3, wherein the function of the shielding cover 4 is a tool for shielding electronic signals, and the function of the shielding cover 4 is to shield the influence of external electromagnetic waves on the internal circuit and the electromagnetic waves generated inside from radiating outward;

[0027] Please refer to Figures 1 to 5 , a capacitor screen sleeve 5 is installed in the inner cavity of the shielding cover 4, wherein the capacitor screen sleeve 5 is a special sleeve structure used for insulating high-voltage electrical appliances such as transformers, circuit breakers, current transformers, etc., which uses the capacitor screen principle to improve the electric field distribution outside the equipment, improve the insulation performance and operation safety, and an expander 6 is installed on the top of the oil storage cabinet 2, wherein the expander 6 can be selected as a metal expander, which is a device specially designed to compensate for the volume change of a medium such as transformer oil caused by temperature changes, and is commonly found in power equipment, especially oil-immersed mutual inductors, transformers, etc. This type of expander is usually made of metal material, has good pressure resistance, temperature resistance and elasticity, can ensure the stability of the internal pressure of the equipment, and prevent problems such as sealing failure or excessive internal pressure caused by oil volume expansion;

[0028] Please refer to Figures 2 to 5 The surface of the oil storage cabinet 2 is equipped with two symmetrically arranged terminals 7, wherein the terminal 7 can be selected as a primary terminal, which refers to a terminal directly connected to a primary circuit in a power system, and is usually used for primary electrical connection of high-voltage equipment such as transformers, circuit breakers, current transformers, voltage transformers, etc., and the function of the primary terminal is to connect or lead out a dedicated interface for the primary high-voltage side power supply or load current inside or outside the power equipment, and is usually made of metal materials such as copper, aluminum or their alloys, and has good conductivity and mechanical strength. The bottom of the bushing 1 is connected to a base 8, and the surface of the bushing 1 is equipped with an outlet box 9, wherein the outlet box 9 is preferably It is a junction box or terminal box, and its function is to include a primary terminal in the outlet box 9. These terminals are the electrical connection points between the primary winding of the transformer and the external high-voltage line such as overhead line and cable. Through these terminals, the high-voltage current can flow into the primary winding of the transformer safely and reliably. This is the primary side connection. Then, similarly, the outlet box 9 is provided with a secondary terminal, which is used to connect the secondary winding of the transformer with external measuring instruments, protection devices, automatic control systems and other low-voltage equipment. The low-voltage signal provided by the secondary terminal reflects the size of the primary side high-voltage current, which is convenient for the secondary equipment to perform functions such as power metering, relay protection, and remote monitoring, thereby completing the secondary side connection;

[0029] Please refer to Figures 3 to 6A cooling assembly 10 is provided at the bottom of the sleeve 1, and the cooling assembly 10 includes an oil injection storage box 101 connected to the sleeve 1. A circulating pump 102 is connected to the bottom of the sleeve 1. A rotating rod 103 is rotatably connected to the inner cavity of the oil injection storage box 101, and a turbine blade 104 is connected to the surface of the rotating rod 103. The discharge port of the circulating pump 102 penetrates into the inner cavity of the sleeve 1, and then the feed port of the circulating pump 102 is aligned with the turbine blade 104. The outer surface of the oil injection storage box 101 is connected to a mounting box 105;

[0030] Please refer to Figures 4 to 6 The end of the rotating rod 103 away from the oil filling storage box 101 penetrates into the inner cavity of the installation box 105, and the shape of the installation box 105 is L-shaped. A connecting rod 106 is rotatably connected in the inner cavity of the installation box 105. The surface of the connecting rod 106 and the surface of the rotating rod 103 are respectively provided with two pulleys 113. The bottom of the inner cavity of the oil filling storage box 101 is penetrated by a running rod 107, and the bottom end of the running rod 107 penetrates the inner side of the installation box 105. The bottom end of the running rod 107 and the surface of the connecting rod 106 are respectively provided with a plurality of pulleys 113. The oil filling storage box 101 is connected to two bevel gears 108, and the two bevel gears 108 are meshed with each other. The surface of the running rod 107 is connected to a fan blade 109. The inner cavity of the oil filling storage box 101 is connected to a heat dissipation component 110, wherein the heat dissipation component 110 is made by integrally forming a sealing block and a heat dissipation fin. The outer surface of the oil filling storage box 101 is connected to a feed pipe 111, wherein a valve is installed on the surface of the feed pipe 111. The bottom of the oil filling storage box 101 is provided with an air inlet 112, and the inner cavity of the air inlet 112 is installed with a dustproof net.

[0031] Specifically, when the user pours the cooling liquid into the oil filling storage box 101 through the feed pipe 111 from the outside of the sleeve 1, the circulating pump 102 can be started to suck the cooling liquid into the inner cavity of the sleeve 1, so that the sleeve 1 and the parts installed in the oil storage cabinet 2 can be heat-dissipated. When the cooling liquid is overheated, the circulating pump 102 can be started to discharge the internal liquid into the oil filling storage box 101, and then the liquid falls into the turbine blades 104 and drives the turbine blades 104 to rotate. The turbine blades 104 drive the rotating rod 103 to rotate, so that the turbine blades 104 stir the poured cooling liquid. Liquid, thereby accelerating the flow rate of the cooling liquid, and utilizing the heat dissipation component 110 for contact heat dissipation, then the rotating rod 103 drives the pulley 113 to rotate, the pulley 113 drives the connecting rod 106 to rotate, the connecting rod 106 drives the bevel gear 108 to rotate in meshing, the bevel gear 108 drives the running rod 107 to rotate, the running rod 107 drives the fan blades 109 to rotate, the fan blades 109 dissipate heat for the heat dissipation component 110, thereby improving the heat dissipation efficiency, when the heat dissipation is completed, the circulating pump 102 can be started to suck the cooling liquid after the heat dissipation back to its original place, thereby achieving the working purpose of improving the heat dissipation efficiency.

[0032] In summary, the working principle of a current transformer of an embodiment of the utility model is: first, the user connects the external electrical equipment or high-voltage wire to the outlet box 9 through the terminal 7, and then contacts the winding component 3 and the capacitor screen bushing 5 inside the bushing 1 through the outlet box 9, so as to convert the external power into a small current in proportion, so as to facilitate the purposes of measurement, protection and control, and after being used for a long time, and through the cooperation of the above-mentioned parts, the measuring and metering coil core and the protection coil core can be separated to use different types of cores, and the measuring and metering coil is fixedly connected without a tap. At this time, the cooling liquid can be poured into the winding component 3 through the cooling component 10 for immersion and heat dissipation, and the expander 6 can be used to detect the cooling liquid level, and the cooling component 10 can be used to circulate and cool the cooling liquid, so as to improve the heat dissipation efficiency of the winding component 3.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A current transformer, comprising a bushing (1), characterized in that: An oil storage cabinet (2) is installed on the surface of the sleeve (1), a winding component (3) is installed in the inner cavity of the oil storage cabinet (2), a shielding cover (4) is installed in the inner cavity of the sleeve (1) and the inner cavity of the winding component (3), and a cooling component (10) is arranged at the bottom of the sleeve (1).

2. A current transformer according to claim 1, characterized in that: A capacitor screen sleeve (5) is installed in the inner cavity of the shielding cover (4), an expander (6) is installed on the top of the oil storage cabinet (2), and two symmetrically arranged terminals (7) are installed on the surface of the oil storage cabinet (2).

3. A current transformer according to claim 1, characterized in that: The cooling assembly (10) comprises an oil injection storage box (101) connected to the sleeve (1), and the bottom of the sleeve (1) is connected to a circulation pump (102).

4. A current transformer according to claim 3, characterized in that: The inner cavity of the oil filling storage box (101) is rotatably connected to a rotating rod (103), and the surface of the rotating rod (103) is connected to turbine blades (104).

5. A current transformer according to claim 4, characterized in that: The outer surface of the oil filling storage box (101) is connected to a mounting box (105), and one end of the rotating rod (103) away from the oil filling storage box (101) penetrates into the inner cavity of the mounting box (105).

6. A current transformer according to claim 5, characterized in that: A connecting rod (106) is rotatably connected in the inner cavity of the installation box (105), and two pulleys (113) are respectively sleeved on the surface of the connecting rod (106) and the surface of the rotating rod (103).

7. A current transformer according to claim 6, characterized in that: A running rod (107) is provided through the bottom of the inner cavity of the oil filling storage box (101), and two bevel gears (108) are respectively connected to the bottom end of the running rod (107) and the surface of the connecting rod (106), and the two bevel gears (108) are meshed with each other.

8. A current transformer according to claim 7, characterized in that: The surface of the operating rod (107) is connected to a fan blade (109), and the inner cavity of the oil filling storage box (101) is connected to a heat dissipation component (110).

9. A current transformer according to claim 8, characterized in that: The outer surface of the oil injection storage box (101) is connected to a feed pipe (111), and the bottom of the oil injection storage box (101) is provided with an air inlet hole (112).

10. A current transformer according to claim 2, characterized in that: The bottom of the sleeve (1) is connected to a base (8), and the surface of the sleeve (1) is installed with an outlet box (9).

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