A medium-voltage switchgear cabinet for improving metering accuracy

Abstract

The present invention discloses a medium-voltage switchgear cabinet for improving metering accuracy, comprising: a medium-voltage switchgear cabinet body, in which at least one current transformer, a cooling device and a temperature detection device are arranged; wherein, the current transformer comprises: a transformer body and at least one conductor, a central hole is formed inside the transformer body, and the conductor is arranged through the central hole; the cooling device is used to provide a low-temperature fluid, and the low-temperature fluid is at least used for heat exchange with the conductor; the temperature detection device is used to detect the temperature of the conductor. By applying the present invention, a medium-voltage switchgear cabinet structure capable of effectively improving metering accuracy is provided. Through the cooling design of the current transformer, it can work stably under a constant temperature state; the structure of the present invention is simple, easy to install and has strong stability.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and in particular to a medium-voltage switchgear cabinet for improving metering accuracy. Background Art

[0002] The medium-voltage switchgear cabinet, also known as a metal-clad medium-displacement switchgear, is commonly used in high-voltage distribution systems to achieve control, protection, monitoring, and measurement of power circuits. Generally, the medium-voltage switchgear cabinet is often divided into three-layer structures. A busbar and an instrument room are arranged on the upper side, a circuit breaker is arranged in the middle, and a cable chamber is arranged on the lower side. Among them, a corresponding current transformer is arranged in the circuit breaker.

[0003] However, during the actual working process, the high temperature generated by the current transformer during long-term use will directly affect the working accuracy of the current transformer, making its measurement data unusable and even damaging the current transformer. Summary of the Invention

[0004] In view of this, to solve the above problems, the purpose of the present invention is to provide a medium-voltage switchgear cabinet for improving metering accuracy, including: a medium-voltage switchgear cabinet body, in which at least one current transformer, a cooling device, and a temperature detection device are arranged; wherein, the current transformer includes: a transformer body and at least one conductor, a central hole is formed inside the transformer body, and the conductor passes through the central hole; the cooling device is used to provide a low-temperature fluid, and the low-temperature fluid is at least used for heat exchange with the conductor; the temperature detection device is used to detect the temperature of the conductor.

[0005] In another preferred embodiment, the low-temperature fluid is a low-temperature liquid or a low-temperature gas.

[0006] In another preferred embodiment, when the low-temperature fluid is the low-temperature liquid, the cooling device includes: at least one heat-conducting member, a fluid channel is formed inside the heat-conducting member, the low-temperature liquid flows in the fluid channel, and a heat-conducting surface is formed on the heat-conducting member, and the heat-conducting surface is closely attached to the outer surface of the conductor.

[0007] In another preferred embodiment, the cooling device includes: two heat-conducting members, the two heat-conducting members are respectively closely attached to the upper and lower parts of the conductor, and the two heat-conducting members are respectively arranged above and below the transformer body.

[0008] In another preferred embodiment, when the low-temperature fluid is the low-temperature gas, the cooling device includes: at least one heat-conducting member, a fluid channel is formed inside the heat-conducting member, at least one through hole is opened on the heat-conducting member, the through hole is communicated with the fluid channel, and the through hole is used to release the low-temperature gas towards the conductor.

[0009] In another preferred embodiment, the cooling device further includes: a supply device configured to supply the cryogenic fluid into the fluid passage.

[0010] In another preferred embodiment, it further includes: a snap structure having a card slot formed thereon, and a card head formed on the heat conducting member, with the card slot matching the card head.

[0011] In another preferred embodiment, an elastic body is provided on the snap structure and is abutted against the conductor.

[0012] In another preferred embodiment, it further includes: a bracket, on which both the cooling device and the temperature detection device are disposed.

[0013] In another preferred embodiment, it further includes: a controller, which is respectively connected to the cooling device and the temperature detection device through wires.

[0014] Due to the adoption of the above technical solutions, the present invention has the following positive effects compared with the prior art: By applying the present invention, a medium-voltage switchgear structure capable of effectively improving the metering accuracy is provided. Through the cooling design of the current transformer, it can stably operate under a constant temperature state; the structure of the present invention is simple, easy to install, and has strong stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an overall schematic diagram of a medium-voltage switchgear for improving metering accuracy according to the present invention;

[0016] Figure 2 is a schematic diagram of the snap structure of a medium-voltage switchgear for improving metering accuracy according to the present invention.

[0017] In the drawings:

[0018] 1, medium-voltage switchgear body; 2, current transformer; 3, cooling device; 4, temperature detection device; 5, transformer body; 6, conductor; 7, central hole; 8, heat conducting member; 9, heat conducting surface; 10, supply device; 11, snap structure; 12, card slot; 13, card head; 14, elastic body; 15, bracket; 16, controller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be further described below in conjunction with the drawings and specific embodiments, but it is not intended to limit the present invention.

[0020] As Figure 1As shown in the figure, a medium-voltage switchgear cabinet for improving metering accuracy in a preferred embodiment is disclosed, which includes: a medium-voltage switchgear cabinet body 1, in which at least one current transformer 2, a cooling device 3 and a temperature detection device 4 are arranged; wherein, the current transformer 2 includes: a transformer body 5 and at least one conductor 6, a central hole 7 is formed inside the transformer body 5, and the conductor 6 is arranged through the central hole 7; the cooling device 3 is used to provide low-temperature fluid, and the low-temperature fluid is at least used for heat exchange with the conductor 6; the temperature detection device 4 is used to detect the temperature of the conductor 6. Further, through the cooling device 3, heat exchange is carried out on the current transformer 2, especially on the surface of the conductor 6, so that the entire current transformer 2 can be in a working state with a stable temperature.

[0021] Further, as a preferred embodiment, the current transformer 2 is preferably arranged inside the circuit breaker.

[0022] Further, as a preferred embodiment, the low-temperature fluid is a low-temperature liquid or a low-temperature gas. Further, the temperature of the fluid is preferably slightly lower than the optimal working temperature of the current transformer 2.

[0023] Further, as a preferred embodiment, when the low-temperature fluid is a low-temperature liquid, the cooling device 3 includes: at least one heat-conducting member 8, a fluid channel is formed inside the heat-conducting member 8, a low-temperature liquid flows in the fluid channel, and a heat-conducting surface 9 is formed on the heat-conducting member 8, and the heat-conducting surface 9 is in close contact with the outer surface of the conductor 6. Further, by flowing the low-temperature liquid inside the heat-conducting surface 9, the conductor 6 outside the heat-conducting surface 9 can exchange heat.

[0024] Further, as a preferred embodiment, the heat-conducting surface 9 is preferably arranged as a plane or an arc surface to increase the contact with the outer surface of the conductor 6 as much as possible, and the heat-conducting surface 9 is preferably tangent to the outer wall of the conductor 6.

[0025] Further, as a preferred embodiment, the fluid channel at least includes a first part and a second part, and both the first part and the second part are arranged in an arc shape.

[0026] Further, as a preferred embodiment, the heat-conducting member 8 includes: an extension part and an arc part, the middle part on the outside of the arc part is connected to one end of the extension part, and a heat-conducting surface 9 is formed inside the arc part.

[0027] Further, as a preferred embodiment, the heat-conducting surface 9 preferably includes: a first surface and a second surface, the first surface and the second surface together are arranged in a V shape, and both the first surface and the second surface are in contact with the outside of the conductor 6.

[0028] Further, as a preferred embodiment, the connection part of the first surface and the second surface is deformable so that the included angle between the first surface and the second surface can be deformed to allow the radial deformation of the conductor 6 under the change of heat and cold.

[0029] Further, as a preferred embodiment, the heat conducting member 8 is made of a material with strong heat conducting ability and insulating ability.

[0030] Further, as a preferred embodiment, the cooling device 3 includes: two heat conducting members 8, the two heat conducting members 8 are respectively in close contact with the upper and lower parts of the conductor 6, and the two heat conducting members 8 are respectively arranged above and below the transformer body 5. Further, the transformer body 5 is arranged in a ring shape, the conductor 6 passes through the transformer body 5 and has portions exposed in the radial direction at both the upper and lower parts, and the two heat conducting members 8 respectively extend radially and are in contact with the corresponding exposed portions.

[0031] Further, as a preferred embodiment, when the low-temperature fluid is a low-temperature gas, the cooling device 3 includes: at least one heat conducting member 8, a fluid channel is formed inside the heat conducting member 8, at least one through hole is formed on the heat conducting member 8, the through hole is communicated with the fluid channel, and the through hole is used for releasing the low-temperature gas towards the conductor 6. Further, the low-temperature gas passes through the fluid channel and is blown out from the through hole to the surface of the conductor 6, thereby realizing air-cooled temperature reduction.

[0032] Further, as a preferred embodiment, the heat conducting member 8 has an arc-shaped surface close to the conductor 6, a plurality of through holes are formed on the arc-shaped surface, the axial direction of the through holes is preferably arranged along the radial direction of the conductor 6, and the plurality of through holes are arranged in sequence along the length direction of the arc-shaped surface.

[0033] Further, as a preferred embodiment, the cooling device 3 further includes: a supply device 10, and the supply device 10 is used for supplying the low-temperature fluid into the fluid channel.

[0034] Further, as a preferred embodiment, the supply device 10 is a liquid supply device 10 or a gas supply device 10. Further, when it is a liquid supply device 10, it is preferably a circulating pump, and when it is a gas supply device 10, it is preferably a fan.

[0035] Further, as a preferred embodiment, the circulating pump is preferably communicated with a coolant tank.

[0036] Further, as a preferred embodiment, the low-temperature gas is preferably the air outside the medium-voltage switchgear body 1, then the medium-voltage switchgear body 1 is provided with a first opening and a second opening, a corresponding fan is arranged on the first opening, and the second opening is used for discharging the internal gas.

[0037] Further, as a preferred embodiment, the first opening is preferably arranged at the upper part of the medium-voltage switchgear body 1, and the second opening is preferably arranged at the lower part of the medium-voltage switchgear body 1.

[0038] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention accordingly.

[0039] On the basis described above, the present invention also has the following implementation manners:

[0040] In a further embodiment of the present invention, when the heat conducting member 8 is preferably in a C-shaped structure, a notch portion is formed on the C-shaped structure, and the inner contour of the notch portion is preferably smaller than the radial outer contour of the conductor 6. Then, when it is necessary to install the conductor 6 and the heat conducting member 8, the conductor 6 can be radially forced to be squeezed into the inner side of the heat conducting member 8, and the notch portion of the heat conducting member 8 preferably can undergo a certain recoverable dimensional deformation.

[0041] As Figure 2 shown, in a further embodiment of the present invention, it further includes: a buckle structure 11, a clamping groove 12 is formed on the buckle structure 11, and a clamping head 13 is formed on the heat conducting member 8, and the clamping groove 12 and the clamping head 13 are matched with each other. Further, when the heat conducting member 8 is preferably in a C-shaped structure, the notch portion of the C-shaped structure is relatively closed through the buckle structure 11, thereby preventing the conductor 6 from accidentally coming out of the inner side of the heat conducting member 8 and causing cooling failure.

[0042] In a further embodiment of the present invention, the rigidity of the buckle structure 11 is greater than that of the heat conducting member 8, so that during the installation process of the buckle structure 11, both ends of the buckle structure 11 will apply a certain squeezing force to move the two ends of the notch portion of the heat conducting member 8 inwards, so that the arc inner surface of the C-shaped structure still completely fits on the outer wall of the conductor 6.

[0043] In a further embodiment of the present invention, the buckle structure 11 is made of an insulating material.

[0044] In a further embodiment of the present invention, the buckle structure 11 includes: an upper buckle portion, a connecting portion and a lower buckle portion, and the upper end and the lower end of the connecting portion are fixedly connected to the middle of the upper buckle portion and the lower buckle portion respectively. The upper buckle portion and the lower buckle portion both extend in the horizontal direction to form two end portions, and a clamping groove 12 is provided on each end portion.

[0045] In a further embodiment of the present invention, a plastic nameplate is provided on the outer side of the connecting portion, and information about the current transformer 2 and the conductor 6 can be provided on the plastic nameplate.

[0046] In a further embodiment of the present invention, the upper buckle portion, the connecting portion and the lower buckle portion are arranged in an integral structure.

[0047] In a further embodiment of the present invention, an elastomer 14 is provided on the snap structure 11, and the elastomer 14 is abutted against the conductor 6. Further, the elastomer 14 abuts against the surface of the conductor 6 so that the conductor 6 is in a stable state without movement. Even when the medium-voltage switchgear vibrates unexpectedly or under other circumstances, the center of the conductor 6 is always coaxially arranged with the center of the central hole 7 to ensure that the current transformer 2 maintains an accurate metering state; and when the conductor 6 deforms radially due to temperature changes, the elastomer 14 can be extruded to allow such deformation, rather than directly bouncing off the snap structure 11 or being extruded and deformed against the inner wall of the heat-conducting member 8.

[0048] In a further embodiment of the present invention, an annular gap is formed between the outer side of the conductor 6 and the inner side of the heat-conducting member 8.

[0049] In a further embodiment of the present invention, the elastomer 14 has a deformable thickness arranged radially along the conductor 6.

[0050] In a further embodiment of the present invention, both the snap structure 11 and the elastomer 14 are made of insulating materials.

[0051] In a further embodiment of the present invention, a through additional channel is formed inside the snap structure 11. When the snap structure 11 is snap-connected to the heat-conducting member 8, both ends of the additional channel are respectively communicated with the fluid channels inside the heat-conducting member 8 to form an annular channel surrounding the conductor 6, so as to further enhance the heat exchange effect.

[0052] In a further embodiment of the present invention, when the above-mentioned annular channel is formed and when a low-temperature gas is used, through holes are provided on the inner side of the snap structure 11.

[0053] In a further embodiment of the present invention, when the above-mentioned annular channel is formed and when a low-temperature liquid is used, a radially inwardly protruding contact surface is provided on the inner side of the snap structure 11 to form an annular surrounding contact with the conductor 6.

[0054] In a further embodiment of the present invention, when the above-mentioned annular channel is formed, the card slot 12 has an additional space in the tangential direction along the outer edge of the heat-conducting member 8. The additional space is formed inside the card slot 12. The additional space allows the card head 13 to be kept inside the card slot 12 while allowing the card head 13 to undergo a certain tangential movement to adapt to the deformation of the conductor 6.

[0055] In a further embodiment of the present invention, it further includes: a bracket 15, and both the cooling device 3 and the temperature detection device 4 are arranged on the bracket 15.

[0056] In a further embodiment of the present invention, the bracket 15 is arranged in the vertical direction, and a connection channel is provided inside the bracket 15. The connection channel is used to connect the supply device 10 and the fluid channel.

[0057] In a further embodiment of the present invention, the temperature detection device 4 includes a plurality of infrared temperature sensors, and at least two infrared temperature sensors are respectively arranged facing the upper and lower parts of the conductor 6.

[0058] In a further embodiment of the present invention, two jacks are provided on the bracket 15, and the two jacks are used for the plug-in installation of the two infrared temperature sensors.

[0059] In a further embodiment of the present invention, the heat conducting member 8 is fixedly connected to the bracket 15, and the heat conducting member 8 extends radially outward relative to the bracket 15.

[0060] In a further embodiment of the present invention, the heat conducting member 8 and the bracket 15 are preferably of an integral structure.

[0061] In a further embodiment of the present invention, a heat exchange surface is formed on one side of the bracket 15 close to the transformer body 5, and the heat exchange surface is connected to the outer wall of the transformer body 5 to simultaneously cool the transformer body 5.

[0062] In a further embodiment of the present invention, a groove is provided along the circumferential direction on the outer wall of the transformer body 5, and an additional heat exchange tube is provided. The two ends of the heat exchange tube are respectively connected to the connection channels, and the heat exchange tube is installed in the groove.

[0063] In a further embodiment of the present invention, it further includes: a controller 16, and the controller 16 is respectively connected to the cooling device 3 and the temperature detection device 4 through lines. Further, through the controller 16, when the temperature detection device 4 monitors that the temperature on the conductor 6 is too high, the cooling device 3 can be controlled to operate to cool the conductor 6 until the conductor 6 returns to the normal temperature.

[0064] In a further embodiment of the present invention, a control panel is provided on the outer side of the medium-voltage switchgear body 1, and the control panel is communicatively connected to the controller.

[0065] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. A medium-voltage switchgear cabinet for improving metering accuracy, characterized in that, it includes: A medium-voltage switchgear cabinet body, in which at least one current transformer, a cooling device and a temperature detection device are arranged; wherein, the current transformer includes: a transformer body and at least one conductor, a central hole is formed inside the transformer body, and the conductor is arranged through the central hole; the cooling device is used to provide a low-temperature fluid, and the low-temperature fluid is at least used for heat exchange with the conductor; the temperature detection device is used to detect the temperature of the conductor; The low-temperature fluid is a low-temperature liquid or a low-temperature gas; When the low-temperature fluid is the low-temperature liquid, the cooling device includes: at least one heat-conducting member, a fluid channel is formed inside the heat-conducting member, the low-temperature liquid flows in the fluid channel, and a heat-conducting surface is formed on the heat-conducting member, and the heat-conducting surface is in close contact with the outer surface of the conductor; when the low-temperature fluid is the low-temperature gas, the cooling device includes: at least one heat-conducting member, a fluid channel is formed inside the heat-conducting member, at least one through hole is formed on the heat-conducting member, the through hole is communicated with the fluid channel, and the through hole is used to release the low-temperature gas towards the conductor; it further includes: a buckle structure, a clamping groove is formed on the buckle structure, and a clamping head is formed on the heat-conducting member, and the clamping groove matches the clamping head; Wherein, an additional channel is formed inside the buckle structure, and when the buckle structure is clamped with the heat-conducting member, both ends of the additional channel are communicated with the fluid channel respectively; The heat-conducting member is of a C-shaped structure, and the buckle structure is used to close the notch part of the C-shaped structure; the rigidity of the buckle structure is greater than that of the heat-conducting member, and during the installation process of the buckle structure, a certain extrusion force is applied to both ends of the buckle structure to make the two ends of the notch part of the heat-conducting member move inwards.

2. The medium-voltage switchgear cabinet for improving metering accuracy according to claim 1, characterized in that, The cooling device includes: two heat-conducting members, the two heat-conducting members are respectively in close contact with the upper part and the lower part of the conductor, and the two heat-conducting members are respectively arranged above and below the transformer body.

3. The medium-voltage switchgear cabinet for improving metering accuracy according to claim 1, characterized in that, The cooling device further includes: a supply device, and the supply device is used to supply the low-temperature fluid into the fluid channel.

4. The medium-voltage switchgear cabinet for improving metering accuracy according to claim 1, characterized in that, An elastic body is arranged on the buckle structure, and the elastic body abuts against the conductor.

5. The medium-voltage switchgear cabinet for improving metering accuracy according to claim 1, characterized in that, It further includes: A bracket, and both the cooling device and the temperature detection device are arranged on the bracket.

6. The medium-voltage switchgear cabinet for improving metering accuracy according to claim 1, characterized in that, It further includes: A controller, and the controller is respectively connected to the cooling device and the temperature detection device through wires.

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