12kv mine solid insulation cabinet

Abstract

This invention relates to a 12kV mining solid-insulated switchgear, comprising an isolation assembly and a mechanism box. The isolation assembly includes a circuit breaker, a disconnector, and an insulating cylinder. Both the circuit breaker and the disconnector are cast inside the insulating cylinder, and the stationary terminal of the circuit breaker is electrically connected to one end of the disconnector. The mechanism box houses the circuit breaker operating mechanism and the disconnector operating mechanism. The outer wall of the insulating cylinder has busbar terminals and load terminals. The busbar terminals are electrically connected to the moving end of the circuit breaker, and the load terminals are electrically connected to the other end of the disconnector. The moving end of the circuit breaker is drive-connected to the circuit breaker operating mechanism, and the operating end of the disconnector is drive-connected to the disconnector operating mechanism. The circuit breaker operating mechanism controls the opening and closing of the circuit breaker, and the disconnector operating mechanism controls the closing, opening, or grounding of the disconnector, thereby controlling the status of the solid-insulated switchgear. The aim is to provide a 12kV mining solid-insulated switchgear with high integration, small size, high protection level, and high measurement accuracy.

Description

Technical Field

[0001] This invention relates to a solid insulation cabinet, and more particularly to a 12kV mining solid insulation cabinet. Background Technology

[0002] Currently, most 12kV mining insulation cabinets on the market adopt the traditional compartmentalized air insulation cabinet structure. The power PT, CT, surge arrester, and temperature measuring device are all external and connected by copper busbars and cables. Each phase has an independent insulation cylinder, and the function is relatively simple. This kind of distributed layout insulation cabinet has a large overall volume, and there are many interfaces and cable holes between the individual components. The sealing design is complicated, resulting in a low overall protection level (IP level) (such as IP4X). It is also susceptible to dust and moisture intrusion, which affects the insulation performance and measurement accuracy. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a 12kV mining solid insulation cabinet with high integration, small size, high protection level and high measurement accuracy.

[0004] This invention discloses a 12kV mine-use solid-insulated switchgear, comprising an isolation assembly and a mechanism box. The isolation assembly includes a circuit breaker, a disconnector, and an insulating cylinder. Both the circuit breaker and the disconnector are cast within the insulating cylinder, with the stationary end of the circuit breaker electrically connected to one end of the disconnector. The mechanism box houses a circuit breaker operating mechanism and a disconnector operating mechanism. The outer wall of the insulating cylinder is provided with spaced busbar terminals and load terminals. The busbar terminals are electrically connected to the moving end of the circuit breaker, and the load terminals are electrically connected to the other end of the disconnector. The moving end of the circuit breaker penetrates the side wall of the mechanism box and is drivenly connected to the circuit breaker operating mechanism, and the operating end of the disconnector penetrates the side wall of the mechanism box and is drivenly connected to the disconnector operating mechanism. The circuit breaker operating mechanism controls the opening and closing of the circuit breaker, and the disconnector operating mechanism controls the closing, opening, or grounding of the disconnector, thereby controlling the state of the solid-insulated switchgear.

[0005] This invention discloses a 12kV mining solid-insulated switch, wherein the disconnecting switch includes a stationary contact, a grounding contact, an isolating blade, and a support base. The stationary contact is cast inside an insulating cylinder and electrically connected to the stationary terminal of the circuit breaker. The grounding contact is fixedly mounted on the side wall of the mechanism box. The support base is fixedly mounted inside the insulating cylinder and electrically connected to the load terminal. The isolating blade is rotatably connected to the support base and is driven by the disconnecting switch operating mechanism. The isolating blade is driven to rotate around the support base by the disconnecting switch operating mechanism. When the isolating blade contacts the stationary contact, a closing operation is achieved; when the isolating blade contacts the grounding contact, a grounding operation is achieved; and when the isolating blade is neither in contact with the stationary contact nor the grounding contact, a opening operation is achieved.

[0006] The present invention provides a 12kV mining solid insulation cabinet, wherein a sealing ring is provided at the mating point between the moving end of the circuit breaker and the side wall of the mechanism box.

[0007] The present invention provides a 12kV mining solid insulation cabinet, wherein a sealing ring is also provided at the interface between the operating end of the disconnecting switch and the side wall of the mechanism box.

[0008] The present invention provides a 12kV mining solid insulation cabinet, which further includes an electromagnetic induction current transformer, wherein the electromagnetic induction current transformer is sleeved on the bus terminal.

[0009] The present invention provides a 12kV mining solid insulation cabinet, which further includes a voltage transformer, wherein the voltage transformer is electrically connected to the busbar terminal.

[0010] The present invention provides a 12kV mining solid insulation cabinet, wherein the isolation component further includes a surge arrester, which is detachably plugged into the outer wall of the insulation cylinder near the support base and electrically connected to the support base.

[0011] The present invention provides a 12kV mining solid insulation cabinet, wherein the isolation component further includes a live display device, which is installed on the outer wall of the insulation cylinder near the surge arrester.

[0012] The present invention provides a 12kV mining solid insulation cabinet, wherein the isolation component further includes a passive temperature sensor, and the passive temperature sensor can be detachably installed on the insulation cylinder near the busbar terminal and the load terminal.

[0013] The present invention discloses a 12kV mining solid insulation cabinet, wherein the isolation components are provided in three sets, the circuit breakers corresponding to the three sets of isolation components are synchronously driven and connected to the circuit breaker operating mechanism, and the disconnecting switches corresponding to the three sets of isolation components are synchronously driven and connected to the disconnecting switch operating mechanism.

[0014] The present invention differs from the prior art in that the solid insulation cabinet of the present invention uses solid insulation materials such as epoxy resin to cast circuit breakers, disconnect switches and other components into one piece. The three sets of isolation components are synchronously connected to the circuit breaker operating mechanism and the disconnect switch operating mechanism in the mechanism box. Moreover, it integrates an inductive current transformer, a voltage transformer, a surge arrester and a passive temperature sensor, forming a solid insulation cabinet structure with high integration and high protection level.

[0015] The 12kV mine solid insulation cabinet of the present invention has at least the following beneficial effects: (1) The structure of this solid insulation cabinet has multiple advantages. On the one hand, it integrates all functional units into one unit, which can avoid the scattered assembly of each functional unit, reduce the overall volume of the solid insulation cabinet, and significantly reduce the number of openings in the cabinet. It simplifies the complex wiring of each functional unit while enhancing the protection level. On the other hand, the main functional units (i.e., circuit breakers and disconnect switches) are sealed in an insulating cylinder through the casting process, which minimizes the external interface of the isolation components and further improves the protection level of the solid insulation cabinet (aiming to reach IP65) to meet the usage requirements of various harsh environments and enhance its adaptability.

[0016] (2) The solid insulation cabinet of the present invention has strong protective performance, which can effectively resist the intrusion of dust and moisture, greatly improve the operational reliability in harsh mining environments, and the high integration can bring higher measurement accuracy. Combined with overvoltage protection and key point temperature monitoring, a complete active safety system is constructed.

[0017] The invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a 12kV mine solid insulation cabinet according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a 12kV mine solid insulation cabinet according to the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the internal structure of a 12kV mine solid insulation cabinet according to the present invention; Figure 4 This is a cross-sectional view of the isolation components, current transformer, and voltage transformer in a 12kV mine solid insulation cabinet according to the present invention. Figure 5 This is a schematic diagram of a passive temperature sensor in a 12kV mine solid-insulated cabinet according to the present invention.

[0019] Figure label: 01-Isolation assembly; 11-Circuit breaker; 12-Disconnecting switch; 121-Stationary contact; 122-Grounding contact; 123-Isolating blade; 124-Support base; 13-Insulating cylinder; 131-Busbar terminal; 132-Load terminal; 14-Sealing ring; 15-Surge arrester; 16-Passive temperature sensor; 17-Sealing sleeve; 02-Mechanism box; 21-Circuit breaker operating mechanism; 22-Disconnecting switch operating mechanism; 23-Control panel; 03-Voltage transformer; 04-Electromagnetic induction current transformer. Detailed Implementation

[0020] like Figure 1 , 2As shown in Figures 3 and 4, the present invention provides a 12kV mine-use solid insulation cabinet, comprising an isolation assembly 01 and a mechanism box 02. The isolation assembly 01 includes a circuit breaker 11, a disconnector 12, and an insulating cylinder 13. Both the circuit breaker 11 and the disconnector 12 are cast inside the insulating cylinder 13, and the stationary end of the circuit breaker 11 is electrically connected to one end of the disconnector 12. The mechanism box 02 is provided with a circuit breaker operating mechanism 21 and a disconnector operating mechanism 22. The outer wall of the insulating cylinder 13 is provided with spaced busbar terminals 131 and load terminals 132. The busbar terminals 131 are electrically connected to the moving end of the circuit breaker 11, and the load terminals 132 are electrically connected to the other end of the disconnector 12. The moving end of the circuit breaker 11 passes through the side wall of the mechanism box 02 and is drivenly connected to the circuit breaker operating mechanism 21, and the operating end of the disconnector 12 passes through the side wall of the mechanism box 02 and is drivenly connected to the disconnector operating mechanism 22. The circuit breaker operating mechanism 21 controls the opening and closing of the circuit breaker 11, and the disconnecting switch operating mechanism 22 controls the closing, opening, or grounding of the disconnecting switch 12, thereby controlling the status of the solid insulation cabinet.

[0021] In this invention, the isolation component 01 in the solid-insulated cabinet integrates the main conductive circuit (i.e., circuit breaker 11, disconnector 12, etc.) with solid insulating materials such as epoxy resin, and is connected to the circuit breaker operating mechanism 21 and disconnector operating mechanism 22 in the mechanism box 02, forming a solid-insulated cabinet structure with high integration and high protection level, as detailed below: The insulating cylinder 13 of this mine solid insulation cabinet is preferably made of epoxy resin. The circuit breaker 11 and the disconnector 12 are integrated into one piece by casting process using this material to form a solid encapsulated isolation component 01 structure with small size and excellent insulation performance. Before casting, the relative positional relationship of each functional unit (such as circuit breaker 11 and disconnector 12) is set, and corresponding operating space and encapsulation space are reserved to ensure that each functional component can work stably and without interference, effectively improving the insulation sealing and stability of the isolation component 01.

[0022] The disconnector switch 12 is a three-position disconnector switch 12. The circuit breaker 11 is arranged horizontally and located directly above the disconnector switch 12. The stationary end (i.e., the left end) of the circuit breaker 11 is electrically connected to the stationary contact 121 (i.e., one end of the disconnector switch 12) of the disconnector switch 12 through a copper strip to realize the current conduction between the two.

[0023] The upper and lower ends of the insulating cylinder 13 are cast with busbar terminals 131 for connecting the busbar and load terminals 132 for supplying power to the outside. The left end of the busbar terminal 131 is located on the outer wall of the insulating cylinder 13, and the right end extends into the insulating cylinder 13 and is flexibly connected to the moving end of the circuit breaker 11 by a copper strip. Similarly, the left end of the load terminal 132 is located on the outer wall of the insulating cylinder 13, and the right end extends into the insulating cylinder 13 and is flexibly connected to the support seat 124 of the disconnecting switch 12 (i.e., the other end of the disconnecting switch 12) by a copper strip, forming a conductive path of busbar terminal 131-circuit breaker 11-disconnecting switch 12-load terminal 132.

[0024] The mechanism box 02 is equipped with a circuit breaker operating mechanism 21 and a disconnector operating mechanism 22 corresponding to the positions of the circuit breaker 11 and the disconnector switch 12. The right side wall of the mechanism box 02 is a control panel 23, which allows operators to operate the two operating mechanisms. The isolation component 01 is detachably installed on the left side wall of the mechanism box 02 with special bolts, facilitating disassembly, assembly, and subsequent maintenance. The left side wall of the mechanism box 02 has through holes that are adapted to the moving end of the circuit breaker 11 and the operating end of the disconnector switch 12, respectively. The operating end of the circuit breaker 11 and the moving end of the disconnector switch 12 pass through the corresponding through holes to the right and are connected to the corresponding operating mechanisms through mechanical transmission components such as chains and gears. By operating the circuit breaker operating mechanism 21, operators can effectively control the opening and closing of the circuit breaker 11, thereby controlling the on / off state of the circuit inside the solid insulation cabinet. By operating the disconnector operating mechanism 22, operators can switch the state of the disconnector switch 12 (i.e., open, closed, and grounded), thereby switching the state of the solid insulation cabinet circuit. In practical applications, operators follow the operating procedures to operate the disconnector switch operating mechanism 22 and the circuit breaker operating mechanism 21, orderly controlling the opening and closing of the circuit breaker 11 and the state switching of the disconnector switch 12, thereby effectively controlling the solid insulation cabinet.

[0025] The structure of this solid insulation cabinet has multiple advantages. On the one hand, it integrates all functional units into one unit, which avoids the scattered assembly of each functional unit, reduces the overall volume of the solid insulation cabinet, significantly reduces the number of openings in the cabinet, simplifies the complex wiring of each functional unit, and enhances the protection level. On the other hand, by using a casting process to seal the main functional units (i.e., circuit breaker 11 and disconnector 12) in an insulating cylinder 13, the external interface of the isolation component 01 is minimized, further improving the protection level of the solid insulation cabinet (targeting IP65) to meet the usage requirements of various harsh environments and enhance its adaptability.

[0026] When in use, the solid insulation cabinet is connected to the mine circuit system. At the beginning, the circuit breaker 11 is in the open state and the disconnecting switch 12 is in the grounded state. When power is needed, first operate the disconnecting switch operating mechanism 22 to switch the disconnecting switch 12 to the closed state, and then operate the circuit breaker operating mechanism 21 to close the circuit breaker 11, and the circuit inside the solid insulation cabinet is connected. When power needs to be cut off, first operate the circuit breaker operating mechanism 21 to open the circuit breaker 11, and then operate the disconnecting switch operating mechanism 22 to switch the disconnecting switch 12 to the open position, thus interrupting the circuit inside the solid insulation cabinet.

[0027] If maintenance or repair of the power grid system is required, the disconnector switch 12 can be switched to the grounding position by operating the disconnector switch operating mechanism 22. At this time, the solid insulation cabinet or the power grid system can be maintained or repaired.

[0028] The solid insulation cabinet of this invention uses solid insulation material to encapsulate the conductive functional unit to ensure insulation performance. It has the advantages of compact structure, maintenance-free operation, and strong environmental adaptability. It can replace the traditional air insulation cabinet in mines and has great promotional value.

[0029] It should be noted that the disconnector operating mechanism 22, the circuit breaker operating mechanism 21, and the circuit breaker 11 are all existing technologies well known to those skilled in the art. The disconnector operating mechanism 22 and the circuit breaker operating mechanism 21 in this invention can adopt various models applicable in the prior art to achieve effective control of the disconnector 12 and the circuit breaker 11.

[0030] like Figure 3 , 4 As shown, the disconnector 12 includes a stationary contact 121, a grounding contact 122, an isolating blade 123, and a support base 124. The stationary contact 121 is cast inside an insulating cylinder 13 and electrically connected to the stationary end of the circuit breaker 11. The grounding contact 122 is fixedly mounted on the side wall of the mechanism housing 02. The support base 124 is fixedly mounted inside the insulating cylinder 13 and electrically connected to the load terminal 132. The isolating blade 123 is rotatably connected to the support base 124 and is driven by the disconnector operating mechanism 22. The isolating blade 123 is driven to rotate around the support base 124 by the disconnector operating mechanism 22. When the isolating blade 123 contacts the stationary contact 121, a closing operation is achieved; when the isolating blade 123 contacts the grounding contact 122, a grounding operation is achieved; and when the isolating blade 123 neither contacts the stationary contact 121 nor the grounding contact 122, a opening operation is achieved. A sealing ring 14 is provided at the mating point between the moving end of the circuit breaker 11 and the side wall of the mechanism housing 02. A sealing ring 14 is also provided at the joint between the operating end of the disconnect switch 12 and the side wall of the mechanism box 02.

[0031] The disconnector switch 12 is cast inside the insulating cylinder 13, with reserved operating space. The stationary contact 121 is cast in the insulating cylinder 13 near the stationary end of the circuit breaker 11 and is electrically connected to the stationary end of the circuit breaker 11 through a copper conductive plate or copper strip, so as to transmit the high voltage in the circuit breaker 11 to the disconnector switch 12. This design can effectively shorten the connection distance between the two and achieve the purpose of reducing the volume of the isolation component 01.

[0032] The grounding contact 122 is fixedly installed on the left side wall of the mechanism box 02 by special bolts and is connected to the external grounding bar by cable or copper strip. It is used to safely ground the solid insulation cabinet and facilitate the disassembly and maintenance of the grounding cable.

[0033] The support base 124 is fixed to the insulating cylinder 13 by special bolts and is located below the stationary contact 121, which facilitates assembly and subsequent maintenance. The isolating blade 123 is preferably a long strip double blade structure with the two blades spaced apart. Its lower end is rotatably connected to the support base 124 by a special locking pin, which also enables the two to conduct. The middle part is provided with an operating rod (which is the operating end of the aforementioned isolating switch 12) rotatably connected by the locking pin. The operating rod passes through the corresponding through hole of the mechanism box 02 and is connected to the isolating switch operating mechanism 22. The upper end of the isolating blade 123 has opposite protrusions on opposite side walls for tightly engaging the stationary contact 121 or the grounding contact 122, ensuring the smoothness and stability of the isolating switch 12 state switching. This structure greatly compresses the installation space and facilitates the miniaturization of the isolating component 01.

[0034] The moving end of circuit breaker 11 is equipped with an insulating pull rod. This insulating pull rod passes through the corresponding through hole on the left side wall of mechanism box 02 and is connected to the circuit breaker operating mechanism 21 to realize the control of circuit breaker 11 opening and closing. In order to enhance the insulation and sealing performance of solid insulation cabinet, a special rubber sealing ring 14 is installed on the mating surface of insulating cylinder 13 and mechanism box 02. A matching special rubber sealing ring 14 is also installed at the through hole on the left side wall of mechanism box 02 (there are two through holes, which are used to pass through the insulating pull rod on the moving end of circuit breaker 11 and the operating rod on disconnect switch 12 respectively), forming a static seal to ensure that the static seal between the two meets the IP65 standard.

[0035] It should be noted that the stationary contact 121 and the grounding contact 122 are located on the circular motion trajectory of the upper end of the isolating blade 123 to ensure the accuracy and stability of the state switching of the isolating switch 12; the spacing between the two blades of the isolating blade 123 is adapted to the thickness of the stationary contact 121 and the grounding contact 122, and can be flexibly set according to actual needs.

[0036] During the switching of the disconnector switch 12's state, the disconnector switch operating mechanism 22 is operated, and the operating lever drives the disconnector blade 123 to rotate around the support base 124, completing the state switching. The initial state of the disconnector switch 12 is grounded, that is, the upper end of the disconnector blade 123 is engaged with the grounding contact 122. When the disconnector blade 123 rotates counterclockwise and is not in contact with either the stationary contact 121 or the grounding contact 122, it switches to the open state. When it continues to rotate counterclockwise and is engaged with the stationary contact 121, it switches to the closed state. Then, when it rotates clockwise and is not in contact with either the stationary contact 121 or the grounding contact 122, it switches back to the open state. When it continues to rotate clockwise and is engaged with the grounding contact 122, it switches back to the grounded state.

[0037] like Figure 1 , 2 As shown in Figures 3 and 4, the solid insulation cabinet also includes an electromagnetic induction current transformer 04, which is mounted on the bus terminal 131. The solid insulation cabinet also includes a voltage transformer 03, which is electrically connected to the bus terminal 131.

[0038] Current transformers are used to proportionally transform the large current on the primary side (i.e., busbar terminal 131) into a smaller current on the secondary side for real-time measurement, protection, or control of solid-insulated cabinets. Traditional cabinet-type insulation systems consist of multiple cabinets working together, meaning the current transformer has its own independent cabinet. Similarly, voltage transformer 03 is mainly used for measuring and real-time monitoring of the high-voltage current in the main circuit (i.e., busbar terminal 131) and providing safe power supply to the secondary circuit. Traditional cabinet-type insulation systems also have voltage transformer 03 in an independent cabinet. This results in a large cabinet size, numerous openings, and complex wiring, leading to a lower protection level (e.g., IP4X), making it difficult to cope with the harsh environment of underground mines.

[0039] To overcome the above problems, this solid insulation cabinet adopts an electromagnetic induction current transformer 04, and the bus terminal 131 of the insulation cylinder 13 has an installation space that is compatible with the electromagnetic induction current transformer 04. The current transformer is firmly installed at the bus terminal 131, and the main circuit current can be sensed by the law of electromagnetic induction to complete the corresponding detection.

[0040] The insulating cylinder 13 has a mounting cavity for installing the voltage transformer 03. The primary side (i.e., the left end) of the voltage transformer 03 is connected to the bus terminal 131 through a special connector. The mounting cavity is filled with epoxy resin sealant to achieve an integrated seal between the voltage transformer 03 and the insulating cylinder 13, eliminating the risk of moisture intrusion and high-voltage discharge, and improving safety.

[0041] This design offers numerous advantages. The solid insulation cabinet eliminates the unnecessary openings of traditional independent cabinets. Combined with the sealing design of the insulation cylinder 13, the overall protection level of the cabinet can be upgraded to IP65, meeting the stringent environmental requirements of dusty and humid mines. At the same time, it enables high-precision measurement of parameters such as current, voltage, and power in the main circuit.

[0042] It should be noted that both the electromagnetic induction current transformer 04 and the voltage transformer 03 are existing technologies known in the field, and will not be described in detail here.

[0043] like Figure 2 , 3 As shown in Figure 4, the isolation assembly 01 also includes a surge arrester 15, which is detachably inserted into the outer wall of the insulating cylinder 13 near the support base 124 and is electrically connected to the support base 124.

[0044] Surge arrester 15 is a "voltage guardian" for electrical equipment. On the one hand, it is used to discharge the surge current generated by lightning overvoltage to prevent the solid insulation cabinet from being damaged by overvoltage breakdown. On the other hand, it is used to protect against operational overvoltage (such as the instantaneous high voltage generated by the start-up and shutdown of large motors and the opening and closing of switches) to prevent related equipment from being damaged.

[0045] The insulating cylinder 13 of this solid insulation cabinet is provided with a dedicated cavity for installing the surge arrester 15. This cavity is located below the disconnecting switch 12 near the load terminal 132, and the left end of the cavity is provided with a copper conductive sleeve that is electrically connected to the support base 124. After the surge arrester 15 is embedded in the dedicated cavity, it is connected to the copper conductive sleeve. This arrangement minimizes the discharge path of the surge arrester 15, which not only improves the discharge speed and reduces the overall size, but also significantly suppresses the problem of residual voltage rise caused by lead inductance (which cannot be achieved in a box-type structure), thereby improving safety and facilitating the later maintenance and replacement of the surge arrester 15.

[0046] To further improve the efficiency of disassembly and assembly of surge arrester 15, the special cavity is inclined, and surge arrester 15 is inserted into the special cavity at an incline, which facilitates disassembly and assembly operations by operators and improves work efficiency.

[0047] During the operation of the solid insulation cabinet, when an abnormally high voltage occurs in the circuit, the surge arrester 15 will quickly guide the huge overvoltage and current to the ground for release, thereby limiting the voltage on the protected line to a safe level. After the overvoltage disappears, it will return to its original state, thus achieving the purpose of protecting the downstream equipment.

[0048] like Figure 3 As shown, the isolation assembly 01 also includes a live indicator device 18, which is installed on the outer wall of the insulating cylinder 13 near the surge arrester 15.

[0049] The high-voltage live display device 18 is a core secondary device that ensures the safe operation of the solid-insulated cabinet. Its core function is to visually indicate the energized status of the circuit, as detailed below: Due to the special nature of the mine environment, the live electrical display device 18 is preferably an inductive live electrical display device 18 that does not require wire connection. It has a sensor inside and a display unit (i.e., indicator light and display screen) outside. The sensor has a built-in high-sensitivity capacitive probe. Based on the electric field coupling effect, it can sense the alternating electric field signal around the high-voltage conductor. The sensor converts the weak electric field signal into an electrical signal and transmits it to the display unit through a shielded wire. The circuit conduction status is displayed through the indicator light and display screen, thereby realizing non-contact detection and improving safety.

[0050] The left side of the surge arrester-specific cavity of the insulating cylinder 13 is provided with a plug-in cavity, and the inductive live display device 18 is plugged into the plug-in cavity, maintaining a safe detection distance (safe detection distance ≥125mm) from the support base 124, so that the sensor can sense the alternating electric field signal around the support base 124. This setting is convenient for operators to observe and for later maintenance. At the same time, it improves the space utilization of the isolation component 01 and reduces its overall volume.

[0051] It should be noted that the inductive live display device 18 is a mature technology in this field. The inductive live display device 18 in this invention can adopt various models applicable in the prior art to realize real-time detection of the circuit status.

[0052] like Figure 4 , 5 As shown, the isolation assembly 01 also includes a passive temperature sensor 16. The passive temperature sensor 16 can be detachably installed on the insulating cylinder 13 near the bus terminal 131 and the load terminal 132.

[0053] The core components, such as the circuit breaker 11 and the disconnector 12, are all encased in a solid insulating cylinder 13 within the solid insulation cabinet, forming a sealed structure. Faulty heating points (such as poor contact) cannot be directly observed and require real-time monitoring via temperature sensors to ensure their temperature remains within safe limits. Because mines contain explosive mixtures of gas and dust, electrical equipment must meet explosion-proof safety requirements, strictly prohibiting the generation of electrical sparks or leakage. Active temperature sensors require external power supplies, posing risks of short circuits and leakage that could generate sparks, thus failing to meet mining explosion-proof standards and safety requirements.

[0054] To overcome the aforementioned problems, this solid insulation cabinet employs a passive temperature sensor 16. This sensor is small in size, can be directly mounted or pre-embedded on the surface of heat-generating components (such as the insulating cylinder 13), and requires no external power supply. It acquires signals through electromagnetic induction, fiber optic transmission, etc., to monitor the internal temperature of the insulation layer, solving the temperature measurement problem of enclosed structures. In addition, the passive temperature sensor 16 can achieve online health status assessment, eliminating the need for regular maintenance by operators and saving costs.

[0055] Installation method: Gaps are left at the mating points of the insulating cylinder 13 with the busbar terminal 131 and the load terminal 132. A detachable sealing sleeve 17 is fitted into each gap. The sealing sleeve 17 has a mounting groove. The passive temperature sensor 16 is installed in the mounting groove. The opening of the mounting groove is sealed with an insulating plug to ensure that the overall airtightness of the insulating cylinder 13 is not damaged after the sensor is installed. The protection level is consistent with the cabinet (IP65). This setting has two advantages. On the one hand, the passive temperature sensor 16 is closely fitted with the two terminals that are prone to heat, which can effectively improve the detection efficiency. On the other hand, the passive temperature sensor 16 is hidden in the insulating sleeve, which does not require additional installation space and helps to improve space utilization.

[0056] like Figure 1 , 3 As shown, the isolation assembly 01 is provided in three sets. The circuit breaker 11 corresponding to the three sets of isolation assemblies 01 is synchronously connected to the circuit breaker operating mechanism 21, and the disconnecting switch 12 corresponding to the three sets of isolation assemblies 01 is synchronously connected to the disconnecting switch operating mechanism 22.

[0057] The 12kV circuit system is a three-phase circuit. Three sets of isolation components 01 are arranged longitudinally at intervals, each corresponding to one phase. The isolation blades 123 in the three sets of disconnecting switches 12 are connected to the disconnecting switch operating mechanism 22 via operating rods to achieve synchronous state switching. Similarly, the moving terminals of the three sets of circuit breakers 11 are also connected to the circuit breaker operating mechanism 21 to achieve synchronous opening or closing.

[0058] The electromagnetic induction current transformer 04 is an integrated three-phase type, such as a through-hole electromagnetic induction current transformer. It integrates three independent through-holes, which are respectively sleeved on the outside of the main body of the bus terminal 131 of the corresponding phase.

[0059] The voltage transformer 03 is preferably a three-phase five-limb type. This voltage transformer 03 is connected to three busbar terminals 131 via connecting cables or copper conductive plates, and is sealed with insulating gaskets. This design not only reduces the overall size of the solid insulation cabinet but also facilitates later inspection and maintenance. Both the voltage transformer 03 and the current transformer described above are prior art known in the art and will not be described in detail here.

[0060] During operation, operators only need to operate the circuit breaker operating mechanism 21 and the disconnecting switch operating mechanism 22 on the control panel 23 according to actual needs to control the status of the three-phase circuit system.

[0061] The solid insulation cabinet of this invention has strong protective performance, effectively resisting the intrusion of dust and moisture, and greatly improving the operational reliability in harsh mining environments. Moreover, its high integration can bring higher measurement accuracy, and together with overvoltage protection and key point temperature monitoring, it can build a complete active safety system.

[0062] It should be noted that the disconnector operating mechanism 22, the circuit breaker operating mechanism 21, and the circuit breaker 11 are all existing technologies well known to those skilled in the art. The disconnector operating mechanism 22 and the circuit breaker operating mechanism 21 in this invention can adopt various models applicable in the prior art to achieve effective control of the disconnector 12 and the circuit breaker 11.

[0063] It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0064] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0065] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A 12kV mining solid-insulation switchgear, characterized in that: The device includes an isolation assembly and a mechanism housing. The isolation assembly includes a circuit breaker, a disconnecting switch, and an insulating cylinder. Both the circuit breaker and the disconnecting switch are cast inside the insulating cylinder, and the stationary end of the circuit breaker is electrically connected to one end of the disconnecting switch. The mechanism housing contains a circuit breaker operating mechanism and a disconnecting switch operating mechanism. The outer wall of the insulating cylinder is provided with spaced busbar terminals and load terminals. The busbar terminals are electrically connected to the moving end of the circuit breaker, and the load terminals are electrically connected to the other end of the disconnecting switch. The moving end of the circuit breaker passes through the side wall of the mechanism box and is connected to the circuit breaker operating mechanism for transmission; the operating end of the disconnecting switch passes through the side wall of the mechanism box and is connected to the disconnecting switch operating mechanism for transmission. The circuit breaker operating mechanism controls the opening and closing of the circuit breaker, and the disconnecting switch operating mechanism controls the closing, opening, or grounding of the disconnecting switch, thereby controlling the status of the solid insulation cabinet.

2. A 12kV mine solid insulation switchboard according to claim 1, characterized in that: The disconnecting switch includes a stationary contact, a grounding contact, an isolating blade, and a support base; The stationary contact is cast into the insulating cylinder and electrically connected to the stationary end of the circuit breaker; the grounding contact is fixedly mounted on the side wall of the mechanism box; the support base is fixedly mounted inside the insulating cylinder and electrically connected to the load terminal; the isolating blade is rotatably connected to the support base and is drively connected to the isolating switch operating mechanism. The isolating switch operating mechanism drives the isolating blade to rotate around the support base. When the isolating blade contacts the stationary contact, a closing operation is achieved. When the isolating blade contacts the grounding contact, a grounding operation is achieved. When the isolating blade is neither in contact with the stationary contact nor with the grounding contact, a opening operation is achieved.

3. A 12kV mine solid insulation switchboard according to claim 2, characterized in that: A sealing ring is provided at the mating point between the moving end of the circuit breaker and the side wall of the mechanism box.

4. A 12kV mine solid insulation switchboard according to claim 3, characterized in that: A sealing ring is also provided at the interface between the operating end of the disconnect switch and the side wall of the mechanism box.

5. A 12kV mine solid insulation switchboard according to claim 4, characterized in that: It also includes an electromagnetic induction current transformer, which is mounted on the bus terminal.

6. A 12kV mine solid insulation switchboard according to claim 5, characterized in that: It also includes a voltage transformer, which is electrically connected to the bus terminal.

7. A 12kV mine solid insulation switchboard according to claim 6, characterized in that: The isolation assembly also includes a surge arrester, which is detachably plugged into the outer wall of the insulating cylinder near the support base and is electrically connected to the support base.

8. A 12kV mining solid-insulation switchboard according to claim 7, characterized in that: The isolation assembly also includes a live indicator device, which is installed on the outer wall of the insulating cylinder near the surge arrester.

9. A 12kV mine solid insulation switchboard according to claim 8, characterized in that: The isolation assembly also includes a passive temperature sensor, which can be detachably installed on the insulating cylinder near both the busbar terminal and the load terminal.

10. A 12kV mine solid insulation switchboard according to claim 9, characterized in that: The isolation components are provided in three sets. The circuit breakers in the three sets of isolation components are synchronously connected to the circuit breaker operating mechanism, and the disconnecting switches in the three sets of isolation components are synchronously connected to the disconnecting switch operating mechanism.

Images