Primary all-insulation high-voltage loop of mining explosion-proof high-voltage power distribution device

Abstract

The embodiment of the invention relates to a primary all-insulation high-voltage loop of a mining explosion-proof high-voltage power distribution device, and the primary high-voltage loop comprises a plurality of first circuit breakers which are arranged in parallel; the inlet wire buses are connected between two adjacent first circuit breakers, each inlet wire bus comprises a conductive rod and an insulating layer wrapping the outer surface of the conductive rod, the cross joints of the inlet wire buses are connected through T-shaped joints, and the end parts of the inlet wire buses in cross connection respectively extend into the T-shaped joints and are connected; incoming buses among the first circuit breakers are connected in series, and the outer surface of the T-shaped connector is insulated. The incoming bus is connected with the circuit breakers through the wall bushing, the inner side of the wall bushing is provided with a coaxial electric conductor, and a conductive rod is connected with the electric conductor in the wall bushing so as to supply power to the first circuit breaker, so that power can be supplied to a plurality of circuit breakers which are connected in parallel at the same time, and the safety of a high-voltage loop is improved.

Description

Technical Field

[0001] The present application relates to the technical field of high-voltage vacuum power distribution, and more specifically, to a primary fully insulated high-voltage circuit of a mine-used flameproof high-voltage power distribution device. Background Art

[0002] The underground environment of coal mines is harsh, and electrical equipment has special working conditions. First, the air underground contains gas and coal dust. Once it reaches a certain concentration, electrical equipment or lines will produce arcs, sparks and local high temperatures, which can easily cause combustion and explosion; secondly, the space available for installing electrical equipment in underground chambers, tunnels, mining working faces, etc. in coal mines is usually very small, so there are certain restrictions on the size of electrical equipment; the air underground is hot and humid, and the humidity is generally above 90%, and there is often dripping and water in the electromechanical chambers and tunnels, which makes electrical equipment very easy to get damp; due to changes in underground geological conditions, especially in the rainy season, there is a possibility of sudden flooding. With the expansion of the scale of coal mine power grids, the use of high-voltage distribution devices has increased, and the probability of safety accidents has also increased accordingly. Therefore, higher requirements are placed on the installation and reliability of flameproof electrical equipment.

[0003] At present, traditional flameproof high-voltage vacuum distribution devices are widely used in coal mines. Multiple devices are connected through busbar connection tubes to realize one or more sections of power supply system. There are the following problems: ① A single high-voltage distribution device is large in size and occupies too much tunnel area in the underground substation. ② The traditional high-voltage distribution device connection method requires absolute horizontal installation, which has strict requirements on the foundation and shell. Once the floor of the chamber is deformed or there is an error in the shell processing, the horizontality of the distribution device may not be ideal, and even problems such as deformation of the joint surface and excessive gap may occur, increasing the risk of explosion failure. ③ Traditional high-voltage distribution devices usually provide secondary control power supply to the integrated protection device through voltage transformers. However, when a short-circuit fault occurs in the system, the protection action may be unreliable, the fault information cannot be recorded in time, and the busbar cabinet cannot be closed, resulting in a large-scale power outage in the underground power grid. ④ The high-voltage conductive part of the circuit breaker of the traditional high-voltage distribution device is exposed, and it is designed separately from the three-position mechanism, which is less safe and has the risk of internal explosion caused by phase-to-phase short circuit. ⑤ As coal mines develop towards digitalization, informatization and intelligence, the demand for intelligent power supply equipment is increasing, and traditional single high-voltage distribution devices can no longer meet the requirements of modern mines. Summary of the invention

[0004] The present application is provided to solve the above defects in the prior art. A fully insulated primary high-voltage circuit of a flameproof high-voltage distribution device for mining is needed to solve the problems of high installation requirements of traditional high-voltage distribution devices, low safety of distribution devices of circuit breakers, and disadvantages of intelligent control.

[0005] In a first aspect of the present application, a fully insulated high-voltage primary circuit of a flameproof high-voltage power distribution device for a mine is provided, wherein the fully insulated high-voltage primary circuit comprises: a first circuit breaker, a plurality of which are arranged and are placed in parallel; an incoming busbar, wherein the incoming busbar is connected between two adjacent first circuit breakers, the incoming busbar comprises a conductive rod and an insulating layer coated on the outer surface of the conductive rod, the cross-connections of the incoming busbars are connected by a T-joint, the ends of the cross-connected incoming busbars are respectively extended into the T-joints and connected, so that the incoming busbars between the plurality of first circuit breakers are connected in series, and the outer surface of the T-joints is insulated; a wall bushing, wherein the busbar is connected to the circuit breaker through the wall bushing, a coaxial conductor is provided on the inner side of the wall bushing, and the conductive rod is connected to the conductor in the wall bushing to supply power to the first circuit breaker.

[0006] The fully insulated primary high-voltage circuit of the explosion-proof high-voltage distribution device for mining provided in each embodiment of the present application can supply power to multiple parallel circuit breakers at the same time, solving the problem that the existing single high-voltage distribution device occupies a large area and has high installation requirements for multiple circuit breakers; the busbar and wall bushing of the power supply equipment achieve full insulation and full shielding effects, and the cross-connections of the busbar are also connected by insulated T-joints, which improves safety; and is conducive to the intelligent control of multiple circuit breakers at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments applied for. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0008] Figure 1 A top view showing the overall structure of a primary fully insulated high-voltage circuit of a mine flameproof high-voltage power distribution device according to an embodiment of the present application; Figure 2 A right view showing the overall structure of a primary fully insulated high-voltage circuit of a mine flameproof high-voltage power distribution device according to an embodiment of the present application; Figure 3 A schematic diagram showing the overall structure of the incoming busbar of a primary fully insulated high-voltage circuit of a mine flameproof high-voltage power distribution device according to an embodiment of the present application; Figure 4 A partial structural schematic diagram of a primary fully insulated high-voltage circuit of a mine flameproof high-voltage power distribution device according to an embodiment of the present application is shown; Figure 5 A schematic diagram showing the disassembled state of the internal structure of the device-side busbar and the circuit breaker connection in an embodiment of the present application; Figure 6 A schematic structural diagram of a wall bushing according to an embodiment of the present application is shown.

[0009] Among them, 1-the first circuit breaker; 2-the incoming busbar; 3-the wall bushing; 4-the T-joint; 5-the second circuit breaker; 6-the first busbar section; 7-the second busbar section; 8-the third busbar section; 9-the cross joint; 10-the plug; 11-the middle busbar; 12-the equipment end busbar; 13-the double-headed screw; 14-the plug; 15-the double-headed bolt; 16-the fixing plate; 17-the conductive rod. DETAILED DESCRIPTION

[0010] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific implementation examples. The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific implementation examples, but are not intended to limit the present application.

[0011] The words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0012] like Figure 1 As shown, according to an embodiment of the present application, a primary fully insulated high-voltage circuit of a mine flameproof high-voltage power distribution device is provided, and the primary fully insulated high-voltage circuit includes: a first circuit breaker 1, which is provided in plurality, and the plurality of first circuit breakers 1 are placed in parallel; an incoming busbar 2, the incoming busbar 2 is connected between two adjacent first circuit breakers 1, the incoming busbar 2 includes a conductive rod and an insulating layer coated on the outer surface of the conductive rod, and the cross-connection of the incoming busbar 2 is connected by a T-joint 4, and the ends of the cross-connected incoming busbars 2 are respectively extended into the T-joint 4 and connected, so that the incoming busbars 2 between the plurality of first circuit breakers 1 are connected in series, and the outer surface of the T-joint 4 is insulated; a wall bushing 3, the incoming busbar 2 is connected to the circuit breaker through the wall bushing 3, a coaxial conductor is provided on the inner side of the wall bushing 3, and the conductive rod is connected to the conductor in the wall bushing 3 to supply power to the first circuit breaker 1.

[0013] Taking five first circuit breakers 1 as an example, the external high-voltage power supply is connected to multiple first circuit breakers 1 through the incoming busbar 2, so that the power consumption of each first circuit breaker 1 is not affected by each other. There are fewer restrictions on the positions of multiple first circuit breakers 1, and multiple first circuit breakers 1 can be independently controlled. It can solve the problem that a single high-voltage power distribution device is bulky and occupies too much lane area. Adjacent first circuit breakers 1 are connected through the incoming busbar 2, and the incoming busbar 2 is coated with an insulating layer. The material of the insulating layer can be silicone, etc., to avoid exposure of high-voltage conductors and ensure the insulation of the incoming busbar 2. The cross-connection of the incoming busbar 2 is connected by a T-joint 4, so that it can be realized in an overall circuit. Power supply to the first circuit breaker 1, improve the insulation performance of the cross-connection, etc., and improve the safety of the entire circuit.

[0014] The wall bushing 3 can realize the electrical connection between the conductor and the first circuit breaker 1. The wall bushing 3 is made of insulating material, which can protect the conductor, avoid the exposure of the high-voltage conductor, and improve the insulation performance. The wall bushing 3 can be obtained by casting a conductor and a modified epoxy resin. The safety of the connection point of the circuit breaker is improved, and the danger of high-voltage conductors being exposed in harsh environments is avoided. Each circuit breaker can have its own grounding function to achieve full grounding of the high-voltage primary circuit.

[0015] Each circuit breaker is connected to an insulated outgoing cable. The high-voltage circuit is: incoming busbar → incoming side of wall terminal → incoming port of circuit breaker → outgoing side of wall terminal → outgoing insulated cable. Each circuit breaker forms a complete high-voltage circuit, and each circuit breaker receives and outputs power separately. Therefore, the entire power distribution device can achieve full shielding and full insulation of the entire high-voltage circuit, which has higher reliability than semi-insulation and / or air insulation.

[0016] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the primary fully insulated high-voltage circuit further includes a plurality of transversely arranged second circuit breakers 5, and the plurality of the second circuit breakers 5 are connected in parallel. Along the current direction of the incoming bus 2, the first bus section 6 connected between the two first circuit breakers 1 at the downstream end is connected to the second bus section 7 connected between the two second circuit breakers 5 at the upstream front end through the third bus section 8. The second circuit breaker 5 does not need to be arranged side by side with the first circuit breaker 1, which solves the problems of large footprint of the existing high-voltage power distribution device, high installation requirements of multiple circuit breakers, and intelligent control of the mine.

[0017] like Figure 3 As shown, the arrow in the figure indicates the direction of the current. Along the direction of the current, the first upstream circuit breaker can be the location for introducing high voltage electricity, and the second upper circuit breaker is connected to the lower circuit breaker through the third bus section 8 to introduce high voltage electricity.

[0018] like Figure 2 and Figure 3 As shown, in some embodiments, the third bus-segment 8 is connected to the first bus-segment 6 and the second bus-segment 7 respectively through a cross joint 9, and the ends of the third bus-segment 8, the first bus-segment 6 and the second bus-segment 7 respectively extend into the cross joint 9 and are connected, and the cross joint 9 is made of insulating material.

[0019] A plurality of first circuit breakers 1 are arranged horizontally or vertically. When there is a second circuit breaker 5 that is not in the same row as the first circuit breaker 1, the second circuit breaker 5 can be introduced through the third busbar section 8. This can solve the problem that the traditional power distribution needs to be installed absolutely horizontally, and can also facilitate power supply to circuit breakers at different positions.

[0020] The insulation of the cross connection can be improved by the cross connector 9. Each circuit breaker is connected to the main power supply. The second circuit breaker 5 is connected in parallel with the first circuit breaker 1. The uses of each circuit breaker may be different, for example, they can be connected to fans, compressors, etc. to ensure the independent use of each circuit breaker.

[0021] like Figure 3 As shown, in some embodiments, the cross connector 9 includes four connected connectors, three of which are respectively connected to the incoming busbar 2 , and one connector is provided with a plug 10 .

[0022] like Figure 3 and Figure 4 As shown, in some embodiments, the busbar includes an intermediate busbar 11 between two adjacent first circuit breakers 1 and an equipment-end busbar 12 between the joint and the first circuit breaker 1, and the T-joint 4 includes four joints, one of which is connected to the intermediate busbar 11, one joint is vertically connected to the equipment-end busbar 12, the equipment-end busbar 12 is perpendicular to the T-joint 4, one joint is provided with a plug 10, and one joint is connected to the intermediate busbar 11 or is a closed structure. In this way, the equipment-end busbar 12 is a separate busbar for each circuit breaker, which is connected to an external power supply through the intermediate busbar 11 to realize parallel connection of multiple circuit breakers. Along the flow direction of the current, the circuit breakers from upstream to downstream are connected in parallel. An external power supply can be introduced at the position of the circuit breaker located at the front end of the upstream.

[0023] The equipment-side busbar 12 is perpendicular to the T-joint 4, so as to guide the electricity to the circuit breaker, thereby facilitating the parallel connection of each circuit breaker and the separate control of each circuit breaker.

[0024] One joint of the T-joint 4 connecting the first circuit breaker 1 at the front end upstream and the first circuit breaker 1 at the end downstream is closed, and only one joint is required to be connected to the intermediate bus 11 and one joint is vertically connected to the equipment end bus 12.

[0025] The cross-connection is covered by the cross connector 9 and the T-connector 4, which does not affect the conduction of the line and can ensure the insulation performance of the cross-connection position.

[0026] In some embodiments, the primary fully insulated high-voltage circuit further includes an explosion-proof partition, and the wall bushing is installed through the explosion-proof partition. In order to improve the safety performance of one end of the circuit breaker, in the environment under the mine, there is gas and coal dust in the air outside the circuit breaker, and the explosion-proof partition is used to reduce the impact of the danger outside the circuit breaker on the circuit breaker.

[0027] like Figure 5 As shown, in some embodiments, the primary fully insulated high-voltage circuit further includes a double-headed screw 13 and a plug 14, the plug 10 is provided with a through hole, the two ends of the double-headed screw 13 are respectively connected to the through hole and the conductive rod 17 of the equipment-end busbar 12, and the plug 14 blocks the through hole. Through the double-headed screw 13, the plug 14 can be connected to the conductive rod 17, and the plug 14 is used for sealing and insulation. The T-joint 4 and the cross joint 9 can be made of silicone or the like. This connection method can make the connection between the circuit breaker and the busbar easier.

[0028] like Figure 5 As shown, in some embodiments, the insulation layer of the equipment-end busbar 12 is sleeved on the outside of the wall bushing 3, and the power distribution device further includes a stud bolt 15, one end of which is connected to the conductor of the wall bushing 3, and the other end is connected to the conductive rod 17. The stud bolt 15 can stabilize the connection between the conductor and the conductive rod 17, making it easier to introduce power to the circuit breaker. The insulation layer of the equipment-end busbar 12 is sleeved on the outside of the wall bushing 3, which can improve the insulation of the connection position.

[0029] In some embodiments, a wireless temperature measuring device is provided in the plug 10. The cross connection is a location with a higher temperature; a wireless temperature measuring device is provided to sense the temperature of the cross connection so as to monitor the temperature change in real time, facilitate the control of the overall power supply circuit, and avoid danger caused by excessive temperature.

[0030] In some embodiments, the thickness of the side wall of the T-joint 4 and / or the cross joint 9 gradually increases from the end to the middle of the T-joint 4 and / or the cross joint 9. The middle position of the T-joint 4 and the cross joint 9 involves the intersection position, so setting the middle thickness larger can improve the insulation performance.

[0031] like Figure 6As shown, in some embodiments, the primary fully insulated high-voltage circuit further includes a fixing plate 16, the busbar includes an A-phase busbar, a B-phase busbar, and a C-phase busbar, the wall bushing 3 includes an A-phase wall bushing 3, a B-phase wall bushing 3, and a C-phase wall bushing 3 respectively connected to the A-phase busbar, the B-phase busbar, and the C-phase busbar, and the A-phase wall bushing 3, the B-phase wall bushing 3, and the C-phase wall bushing 3 are respectively penetrated through the fixing plate 16. Each circuit breaker has independent A-phase, B-phase, and C-phase interfaces, respectively. The fixing plate 16 facilitates the relative positions of the A-phase wall bushing 3, the B-phase wall bushing 3, and the C-phase wall bushing 3 to be more stable.

[0032] like Figure 6 As shown, the wall bushing includes a bushing part connected to the circuit breaker and a bushing part connected to the busbar at the equipment end, thereby improving shielding and insulation performance.

[0033] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present application with equivalent elements, modifications, omissions, combinations (e.g., various embodiments intersecting schemes), adaptations or changes. The elements in the claims are to be interpreted broadly based on the language adopted in the claims, and are not limited to the examples described in this specification or during the practice of this application, and the examples are to be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered as examples only, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0034] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more schemes thereof) may be used in combination with each other. For example, a person of ordinary skill in the art may use other embodiments when reading the above description. In addition, in the above-mentioned specific embodiments, various features may be grouped together to simplify the present application. This should not be interpreted as an intention that a feature of an application that does not require protection is necessary for any claim. On the contrary, the subject matter of the present application may be less than all the features of an embodiment of a particular application. Thus, the following claims are incorporated herein in the specific embodiments as examples or embodiments, wherein each claim is independently a separate embodiment, and it is considered that these embodiments may be combined with each other in various combinations or arrangements. The scope of the present invention should be determined with reference to the appended claims and the full scope of equivalent forms granted by these claims.

[0035] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A fully insulated primary high-voltage circuit of a mine flameproof high-voltage power distribution device, characterized in that: The primary fully insulated high-voltage circuit comprises: A first circuit breaker is provided in plurality, and the plurality of first circuit breakers are placed in parallel; An incoming busbar, the incoming busbar is connected between two adjacent first circuit breakers, the incoming busbar comprises a conductive rod and an insulating layer covering the outer surface of the conductive rod, the cross-connection of the incoming busbar is connected by a T-joint, the ends of the cross-connected incoming busbars are respectively extended into the T-joint and connected, so that the incoming busbars between the multiple first circuit breakers are connected in series, and the outer surface of the T-joint is insulated; A wall bushing, the busbar is connected to the circuit breaker through the wall bushing, a coaxial conductor is provided on the inner side of the wall bushing, and the conductive rod is connected to the conductor in the wall bushing to supply power to the first circuit breaker.

2. The fully insulated primary high-voltage circuit according to claim 1, characterized in that: The primary fully insulated high-voltage circuit also includes a plurality of transversely arranged second circuit breakers, which are connected in parallel. Along the current direction of the incoming bus, the first bus section connected between the two first circuit breakers at the downstream end is connected to the second bus section connected between the two second circuit breakers at the upstream front end through a third bus section.

3. The fully insulated primary high-voltage circuit according to claim 2, characterized in that: The third busbar section and the first busbar section are respectively connected to the second busbar section via a cross joint, and the ends of the third busbar section, the first busbar section and the second busbar section respectively extend into the cross joint and are connected, and the cross joint is made of insulating material.

4. The fully insulated primary high-voltage circuit according to claim 3, characterized in that: The cross joint comprises four connected joints, three of which are respectively connected to the incoming busbars, and one joint is provided with a plug.

5. The fully insulated primary high-voltage circuit according to claim 1, characterized in that: The incoming busbar includes an intermediate busbar between two adjacent first circuit breakers and an equipment-end busbar between the joint and the first circuit breaker. The T-joint includes four joints, one of which is connected to the intermediate busbar, one joint is vertically connected to the equipment-end busbar, the equipment-end busbar is perpendicular to the T-joint, one joint is provided with a plug, and one joint is connected to the intermediate busbar or is a closed structure.

6. The fully insulated primary high-voltage circuit according to claim 4 or 5, characterized in that: The primary fully insulated high-voltage circuit also includes a double-headed screw and a plug. The plug is provided with a through hole. Both ends of the double-headed screw are respectively connected to the through hole and the conductive rod, and the plug seals the through hole.

7. The fully insulated primary high-voltage circuit according to claim 6, characterized in that: The insulating layer of the equipment-end busbar is sleeved on the outside of the wall bushing. The power distribution device also includes a cable bushing and a stud bolt. One end of the stud bolt is connected to the conductor of the wall bushing, and the other end is connected to the conductive rod.

8. The fully insulated primary high-voltage circuit according to claim 4 or 5, characterized in that: A wireless temperature measuring device is preset in the plug.

9. The fully insulated primary high-voltage circuit according to claim 1, characterized in that: Along the direction from the end to the middle of the T-joint and / or the cross joint, the thickness of the side wall of the T-joint and / or the cross joint gradually increases.

10. The fully insulated primary high-voltage circuit according to claim 1, characterized in that: The primary fully insulated high-voltage circuit also includes a fixed plate, the busbar includes an A-phase busbar, a B-phase busbar and a C-phase busbar, the wall bushing includes an A-phase wall bushing, a B-phase wall bushing and a C-phase wall bushing respectively connected to the A-phase busbar, and the A-phase wall bushing, the B-phase wall bushing and the C-phase wall bushing are respectively inserted into the fixed plate.

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