Low-loss intelligent high-low voltage switchgear assembly
By combining the design of the air guide, air supply unit, exhaust unit and looseness detection unit, the problems of high contact resistance and unstable connection in high and low voltage switchgear are solved, and the equipment operation with low loss and high stability is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NANTONG XINGYU ELECTRICAL
- Filing Date
- 2026-02-04
- Publication Date
- 2026-05-08
AI Technical Summary
In high and low voltage switchgear, cables and terminals are often connected by bolted rigid connections. Microscopic gaps are prone to exist at the contact interface, resulting in high contact resistance, large heat generation, and thermal expansion and contraction effects that lead to unstable connections, increase power loss, and affect the operational stability of the equipment.
The system employs a combined design of a flow guide, an air supply unit, an exhaust unit, and a loosening detection unit. The flow guide provides heat dissipation, the air supply unit accelerates airflow, the exhaust unit performs temperature detection and uses a semiconductor cooler for cooling, and the loosening detection unit monitors the condition of the crimped nuts online to ensure a stable connection.
It effectively reduces losses at terminal wiring points, improves equipment operational stability, reduces maintenance frequency, and ensures connection stability and safety through online detection and automatic adjustment.
Smart Images
Figure CN122000803A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of electrical switchgear technology, and in particular relates to a low-loss intelligent high and low voltage switchgear. Background Technology
[0002] High and low voltage switchgear is a core power distribution device in the power system, which can realize the transmission, distribution, control and protection of electrical energy. It is widely used in power grid substations, industrial plants, high-rise buildings and new energy power stations such as photovoltaic and wind power, providing key support for reliable power supply in various scenarios.
[0003] Currently, high and low voltage switchgear typically includes dedicated incoming and outgoing sides for the input, output, and rational distribution of electrical energy. However, cables and terminals often use rigid bolt connections, which can create microscopic gaps at the contact interface. This results in high resistance at the contact points, leading to significant heat generation. This heat exacerbates oxidation at the contact points, further increasing contact resistance. This creates a vicious cycle of "high heat generation - increased contact resistance - further increased heat generation," significantly increasing energy loss at the cables and terminals. Furthermore, thermal expansion and contraction can cause terminals to loosen, compromising the connection stability between cables and terminals. The concentrated arrangement of the incoming and outgoing sides also facilitates localized heat accumulation, further increasing the probability of these problems and severely impacting the operational stability of high and low voltage switchgear. Summary of the Invention
[0004] The purpose of this invention is to address the above-mentioned problems by providing a low-loss intelligent high and low voltage switchgear.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a low-loss intelligent high and low voltage switchgear, comprising a junction box and a switchgear body mounted on top of the junction box, wherein a plurality of terminal assemblies are mounted on the upper inner sidewall of the junction box, and the terminal assemblies are fitted with crimp nuts, and further comprising:
[0006] Several flow guides are detachably installed on the top inner wall of the junction box, and the terminal assemblies in the same column are all located inside the corresponding flow guides.
[0007] An air supply unit is installed on the back of the junction box. The air outlet of the air supply unit is connected to the inside of the air guide shroud, and the air intake of the air supply unit is connected to the inside of the junction box.
[0008] An exhaust unit is installed on the front side wall of the junction box. The air inlet of the exhaust unit is connected to the air guide shroud, and the air outlet of the exhaust unit is connected to the interior of the junction box.
[0009] A loosening detection unit is installed inside the junction box, and the loosening detection unit detects the tightness of the crimping nut.
[0010] Preferably, the air supply unit includes a sealing cover fixed to the back of the junction box, an air pump fixed inside the sealing cover, an air supply pipe fixed to the output end of the air pump, an air inlet horizontal pipe with sealed ends fixed to the outlet end of the air supply pipe, an air inlet diverter pipe connected to the wall of the air inlet horizontal pipe and communicating with the flow guide cover, an air inlet pipe connected to the suction end of the air pump and communicating with the inside of the junction box, and the air pump is electrically connected to the control terminal of the switch cabinet body.
[0011] Preferably, the exhaust unit includes a horizontal exhaust pipe sealed at both ends, the horizontal exhaust pipe is located on the outside of the junction box, a plurality of exhaust diversion pipes are fixedly inserted into the pipe wall of the horizontal exhaust pipe, the exhaust diversion pipes are equipped with temperature measuring components, and the exhaust diversion pipes are connected to the flow guide shroud through the temperature measuring components, and the exhaust pipes are fixedly inserted into the pipe wall of the horizontal exhaust pipes and connected to the inside of the junction box.
[0012] Preferably, the temperature measuring component includes a temperature measuring box fixed to the outer wall of the junction box, the air guide shroud is connected to the air outlet pipe through the temperature measuring box, a temperature measuring probe is fixed on the top of the temperature measuring box, and the temperature measuring end of the temperature measuring probe is located inside the temperature measuring box. The control terminal of the switch cabinet body controls the loosening detection unit to work according to the electrical signal fed back by the temperature measuring probe.
[0013] Preferably, the loosening detection unit includes an insulating top cover fixed to the inner side wall of the top of the junction box. A fixed conductive head and an insulating cylinder are fixed to the bottom of the insulating top cover, and the fixed conductive head is located inside the insulating cylinder. An insulating slide rod is slidably inserted into the bottom of the insulating cylinder, and a movable conductive head is fixed to the top of the insulating slide rod. A hemispherical block is fixed to the bottom of the insulating slide rod, and a positioning top pressure block is fixed to the bottom of the crimping nut. When the positioning top pressure block contacts the lowest point of the hemispherical block, the top of the movable conductive head contacts the top of the fixed conductive head. The switch cabinet body detects the conduction status between the movable conductive head and the fixed conductive head based on the electrical signal fed back by the temperature probe.
[0014] Preferably, a semiconductor cooler is fixed to the side wall of the sealing cover, and the cooling end of the semiconductor cooler is located inside the sealing cover. The control terminal of the switch cabinet body controls the semiconductor cooler to work according to the electrical signal fed back by the temperature probe.
[0015] Preferably, the bottom of the flow guide is provided with a plurality of through holes, and a rubber sealing ring is fixed inside the through holes.
[0016] Preferably, an indicator light is fixed to the outer wall of the insulating cylinder, and the indicator light is connected in series with the movable conductive head and the fixed conductive head.
[0017] Compared with existing technologies, the advantages of a low-loss intelligent high and low voltage switchgear are:
[0018] 1. Through the cooperation of the wiring cabinet, switch cabinet body, terminal assembly and crimping nut, the incoming and outgoing lines of high and low voltage switchgear can be connected. Through the cooperation of the flow guide, air supply unit and exhaust unit, the terminal assembly can be cooled down in a targeted manner, so as to avoid the vicious cycle of "heating-increased contact resistance-increased heat generation" at the terminal connection, reduce the loss at the terminal connection, improve the working stability of high and low voltage switchgear and reduce the frequency of maintenance.
[0019] 2. The loosening detection unit can detect the loosening status of each crimp nut online and remind the staff when a loose crimp nut is detected so that timely maintenance can be carried out to avoid unstable contact at the terminal for a long time. In addition, the loosening detection unit can assist in positioning the crimp nut during wiring to ensure that the crimp nut is tightened in place.
[0020] 3. The temperature sensing component can automatically activate the looseness detection unit based on the heat generated at each terminal component. In addition, the semiconductor cooler can automatically adjust the temperature of the heat dissipation airflow to the terminal components based on the heat, so as to meet the heat dissipation requirements. Attached Figure Description
[0021] Figure 1 This is a three-dimensional structural diagram of a low-loss intelligent high and low voltage switchgear provided by the present invention.
[0022] Figure 2 This is a three-dimensional structural diagram of the junction box of a low-loss intelligent high and low voltage switchgear provided by the present invention.
[0023] Figure 3 This is a schematic diagram of the internal structure of the junction box of a low-loss intelligent high and low voltage switchgear provided by the present invention.
[0024] Figure 4 This invention provides a low-loss intelligent high and low voltage switchgear. Figure 3 Enlarged view of the structure of section A;
[0025] Figure 5 This is a schematic diagram of the terminal assembly of a low-loss intelligent high and low voltage switchgear provided by the present invention.
[0026] Figure 6 This is a schematic diagram of the loosening detection unit of a low-loss intelligent high and low voltage switchgear provided by the present invention.
[0027] Figure 7 This is a schematic diagram of the structure of the flow guide cover of a low-loss intelligent high and low voltage switchgear provided by the present invention.
[0028] In the diagram: 1. Wiring cabinet; 2. Switch cabinet body; 3. Terminal assembly; 4. Crimp nut; 5. Flow guide; 6. Air supply unit; 61. Sealing cover; 62. Air pump; 63. Air delivery pipe; 64. Inlet horizontal pipe; 65. Inlet diverter pipe; 66. Suction pipe; 7. Exhaust unit; 71. Outlet horizontal pipe; 72. Outlet diverter pipe; 73. Return pipe; 8. Loosening detection unit; 81. Insulating top cover; 82. Fixed conductive head; 83. Insulating cylinder; 84. Insulating slide bar; 85. Movable conductive head; 86. Hemispherical block; 87. Positioning top pressure block; 9. Temperature measuring component; 91. Temperature measuring box; 92. Temperature measuring probe; 10. Semiconductor cooler; 11. Rubber sealing ring; 12. Indicator light. Detailed Implementation
[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0030] like Figures 1-7 As shown, a low-loss intelligent high and low voltage switchgear includes a junction box 1 and a switchgear body 2 mounted on top of the junction box 1. Several terminal assemblies 3 are mounted on the upper inner wall of the junction box 1, and each terminal assembly 3 is fitted with a crimping nut 4. The switchgear also includes several air guides 5, which are detachably mounted on the upper inner wall of the junction box 1. Terminal assemblies 3 in the same column are all located inside the corresponding air guide 5. An air supply unit 6 is mounted on the back of the junction box 1, and the outlet of the air supply unit 6 is connected to the interior of the air guide 5. The air intake end of the air supply unit 6 is connected to the interior of the junction box 1. The air supply unit 6 includes a sealing cover 61 fixed to the back of the junction box 1. An air pump 62 is fixed inside the sealing cover 61. An air supply pipe 63 is fixed to the output end of the air pump 62. An air inlet horizontal pipe 64 with sealed ends is fixedly connected to the outlet end of the air supply pipe 63. An air inlet diverter pipe 65 connected to the guide cover 5 is fixedly inserted into the pipe wall of the air inlet horizontal pipe 64. An air intake pipe 66 connected to the interior of the junction box 1 is fixedly connected to the air intake end of the air pump 62. The air pump 62 is electrically connected to the control end of the switch cabinet body 2.
[0031] The exhaust unit 7 is installed on the front wall of the junction box 1. The air inlet of the exhaust unit 7 is connected to the air guide shroud 5, and the air outlet of the exhaust unit 7 is connected to the interior of the junction box 1. The exhaust unit 7 includes a horizontal exhaust pipe 71 sealed at both ends. The horizontal exhaust pipe 71 is located on the outside of the junction box 1. Several exhaust branch pipes 72 are fixedly inserted into the wall of the horizontal exhaust pipe 71. Temperature measuring components 9 are installed on the exhaust branch pipes 72, and the exhaust branch pipes 72 are connected to the air guide shroud 5 through the temperature measuring components 9. The wall of the horizontal exhaust pipe 71 is fixedly inserted into the air guide shroud 5. The internally connected return pipe 73 and the temperature measuring component 9 include a temperature measuring box 91 fixed on the outer wall of the junction box 1. The flow guide shroud 5 is connected to the exhaust pipe 72 through the temperature measuring box 91. A temperature measuring probe 92 is fixed on the top of the temperature measuring box 91, and the temperature measuring end of the temperature measuring probe 92 is located inside the temperature measuring box 91. The control terminal of the switch cabinet body 2 controls the loosening detection unit 8 to work according to the electrical signal fed back by the temperature measuring probe 92. The temperature measuring probe 92 can detect the temperature and feed back an electrical signal to the control terminal of the switch cabinet body 2 after detecting that the temperature reaches the threshold.
[0032] The loosening detection unit 8 is installed inside the junction box 1 and detects the tightness of the crimp nut 4. The loosening detection unit 8 includes an insulating top cover 81 fixed to the inner side wall of the top of the junction box 1. The bottom of the insulating top cover 81 is fixed with a fixed conductive head 82 and an insulating cylinder 83. The fixed conductive head 82 is located inside the insulating cylinder 83. An insulating slide rod 84 is slidably inserted into the bottom of the insulating cylinder 83. A movable conductive head 85 is fixed to the top of the insulating slide rod 84. A hemispherical block 86 is fixed to the bottom of the insulating slide rod 84. A positioning top pressure block 87 is fixed to the bottom of the crimp nut 4. When the positioning top pressure block 87 contacts the lowest point of the hemispherical block 86, the top of the movable conductive head 85 contacts the top of the fixed conductive head 82. The switch cabinet body 2 detects the conduction status of the movable conductive head 85 and the fixed conductive head 82 according to the electrical signal fed back by the temperature probe 92. A limiter is provided at the insulating slide rod 84 to prevent the insulating slide rod 84 from detaching from the insulating cylinder 83 when it moves down.
[0033] A thermoelectric cooler 10 is fixed to the side wall of the sealing cover 61, and the cooling end of the thermoelectric cooler 10 is located inside the sealing cover 61. The control terminal of the switch cabinet body 2 controls the operation of the thermoelectric cooler 10 according to the electrical signal fed back by the temperature probe 92. The thermoelectric cooler 10 is based on the Peltier effect. Its core is a thermopile composed of multiple sets of N-type and P-type semiconductor thermocouples connected in series. The two ends of the thermopile form a cold end and a hot end, respectively. When DC current is applied to the thermopile, the charge carriers will migrate directionally under the action of the electric field. Heat is absorbed at the end from the N-type semiconductor to the P-type semiconductor, which lowers the temperature of that end and forms a cold end. Heat is released at the end from the P-type semiconductor to the N-type semiconductor. The thermoelectric cooler 10 is equipped with a fan at the hot end to assist in heat dissipation and cooling.
[0034] The bottom of the flow guide shroud 5 has several through holes, and a rubber sealing ring 11 is fixed inside the through holes. The rubber sealing ring 11 can ensure the sealing between the through holes and the cable, and prevent airflow from flowing through the through holes.
[0035] An indicator light 12 is fixed on the outer wall of the insulating cylinder 83, and the indicator light 12 is connected in series with the movable conductive head 85 and the fixed conductive head 82. The indicator light 12 can help the staff to quickly locate the faulty terminal assembly 3.
[0036] The operating principle of the present invention is explained as follows: The switch cabinet body 2 is wired using a bottom-in, bottom-out method. The cable enters from the bottom of the junction box 1 and then passes through the rubber sealing rings 11 at the bottom of the corresponding flow guide 5 in sequence (the inner diameter of the rubber sealing ring 11 can be preset according to the diameter of the cable passing through). Then the cable end is connected to the corresponding terminal assembly 3, and the cable end is fixed at the terminal assembly 3 by tightening the crimp nut 4. After the cables in the same column are connected, the corresponding flow guide 5 is installed on the top inner wall of the junction box 1 until all the cables are wired and all the flow guide 5 are installed.
[0037] During normal operation, the control terminal of the switch cabinet body 2 starts the air pump 62. The air pump 62 draws out the gas in the junction box 1 and delivers the gas to each guide shroud 5 through the air supply pipe 63, the air inlet horizontal pipe 64, and the air inlet diversion pipe 65. Finally, the gas is discharged back into the junction box 1 through the air outlet diversion pipe 72, the temperature measuring box 91, the air outlet horizontal pipe 71, and the return pipe 73. Since the air pump 62 concentrates the airflow to flow through each terminal assembly 3, it can fully accelerate the airflow around the terminal assembly 3 to accelerate the heat dissipation at the terminal assembly 3.
[0038] When the temperature at terminal assembly 3 rises (e.g., due to increased load), the temperature of the gas flowing out from inside the flow guide shroud 5 also rises. At this time, the gas temperature inside the temperature measuring box 91 rises, and the corresponding temperature measuring probe 92 will detect the rise in gas temperature. When the temperature exceeds 45°C, the main body 2 of the switch cabinet will start the semiconductor cooler 10. The semiconductor cooler 10 forms a hot and cold end by being energized. The cold end is attached to the heat dissipation substrate inside the sealing cover 61 to absorb heat, and the hot end dissipates the heat to the outside of the cabinet through the cooling fan (the hot end of the semiconductor cooler 10 is equipped with a fan for heat dissipation). This can cool down the inside of the sealing cover 61, making the temperature of the gas flowing through the sealing cover 61 lower, thereby accelerating the heat dissipation and cooling efficiency of the terminal assembly 3, so as to avoid excessive temperature rise at the terminal assembly 3.
[0039] When the temperature probe 92 detects a temperature exceeding 55°C, it indicates an abnormal temperature rise in the terminal assembly 3 inside the flow guide shroud 5 (for example, a short circuit or other fault at the connection between the cable and the terminal assembly 3 causes an increase in the microscopic gap, leading to increased contact resistance and subsequent continuous temperature rise at the connection). At this time, the temperature probe 92 will send an electrical signal back to the control terminal of the switch cabinet body 2 (when the temperature reaches 45°C, the temperature probe 92 will send an electrical signal back to the control terminal of the switch cabinet body 2 once; when the temperature reaches 55°C, the temperature probe 92 will send a second electrical signal back to the control terminal of the switch cabinet body 2 after sending the first electrical signal; after receiving the first electrical signal, the control terminal of the switch cabinet body 2 will only execute the activation of the semiconductor cooler 1). Upon receiving a secondary electrical signal, the switch cabinet body 2 will not only activate the semiconductor cooler 10 but also perform an action to detect the continuity status of the connection circuit between the fixed conductive head 82 and the movable conductive head 83. The control terminal of the switch cabinet body 2 will then detect the continuity status of each fixed conductive head 82 and movable conductive head 85 inside the flow guide shroud 5. If the crimping nut 4 is not loose, it indicates a stable connection between the cable and the terminal assembly 3. At this time, due to the pushing and supporting effect of the positioning top pressure block 87 on the hemispherical block 86 at the crimping nut 4, the movable conductive head 85 will be in stable contact with the fixed conductive head 82. Therefore, the control terminal of the switch cabinet body 2 will detect that the connection circuit between the movable conductive head 85 and the fixed conductive head 82 remains continuous. Conversely, if the crimping nut 4 becomes loose... The crimping nut 4 causes the positioning top pressure block 87 to deflect to one side. At this time, the positioning top pressure block 87 and the hemispherical block 86 are misaligned. Under the action of gravity, the hemispherical block 86 will move downward, thereby driving the movable conductive head 85 to move downward through the insulating slide rod 84 and disengage from the fixed conductive head 82. At this time, the control terminal of the switch cabinet body 2 detects that the connection circuit between the movable conductive head 85 and the fixed conductive head 82 is broken. The switch cabinet body 2 will immediately issue an alarm message through its own alarm module (for example, send a prompt message to the monitoring terminal through the communication module). The alarm message includes the corresponding number of the flow guide 5 (each flow guide 5 is numbered. When the connection circuit between the movable conductive head 85 and the fixed conductive head 82 inside is broken, the switch cabinet body 2 will issue an alarm message). (The information of the numbered flow guide 5 is sent to the remote terminal). After receiving the alarm information, the staff should promptly inspect the equipment. During the inspection, the flow guide 5 with the corresponding number should be removed first, and the inspection procedure should be started separately through the control terminal of the switch cabinet body 2. The control terminal of the switch cabinet body 2 supplies power to the connection circuit between the fixed conductive head 82 and the movable conductive head 85. When the fixed conductive head 82 and the movable conductive head 85 are separated, the connection circuit between the fixed conductive head 82, the movable conductive head 85 and the indicator light 12 is also disconnected, so the corresponding indicator light 12 does not light up. Conversely, when the fixed conductive head 82 and the movable conductive head 85 are in normal contact, the corresponding indicator light 12 lights up, which makes it easier for the staff to quickly locate the faulty terminal assembly 3.
[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A low-loss intelligent high and low voltage switchgear, comprising a junction box (1) and a switchgear body (2) mounted on the top of the junction box (1), wherein a plurality of terminal assemblies (3) are mounted on the upper inner sidewall of the junction box (1), and the terminal assemblies (3) are fitted with crimp nuts (4), characterized in that, Also includes: Several flow guides (5) are detachably installed on the top inner side wall of the junction box (1), and the terminal assemblies (3) in the same column are all arranged inside the corresponding flow guides (5); An air supply unit (6) is installed on the back of the junction box (1). The air outlet of the air supply unit (6) is connected to the inside of the guide shroud (5), and the air intake of the air supply unit (6) is connected to the inside of the junction box (1). An exhaust unit (7) is installed on the front side wall of the junction box (1). The air inlet of the exhaust unit (7) is connected to the air guide (5), and the air outlet of the exhaust unit (7) is connected to the interior of the junction box (1). A loosening detection unit (8) is installed inside the junction box (1), and the loosening detection unit (8) detects the tightness of the crimp nut (4).
2. The low-loss intelligent high and low voltage switchgear according to claim 1, characterized in that, The gas supply unit (6) includes a sealing cover (61) fixed on the back of the junction box (1). An air pump (62) is fixed inside the sealing cover (61). An air supply pipe (63) is fixed at the output end of the air pump (62). An air inlet horizontal pipe (64) with sealed ends is fixedly connected to the outlet end of the air supply pipe (63). An air inlet diversion pipe (65) connected to the guide cover (5) is fixedly inserted into the pipe wall of the air inlet horizontal pipe (64). An air inlet pipe (66) connected to the inside of the junction box (1) is fixedly connected to the suction end of the air pump (62). The air pump (62) is electrically connected to the control end of the switch cabinet body (2).
3. The low-loss intelligent high and low voltage switchgear according to claim 2, characterized in that, The exhaust unit (7) includes an exhaust horizontal pipe (71) sealed at both ends. The exhaust horizontal pipe (71) is located on the outside of the junction box (1). Several exhaust diversion pipes (72) are fixedly inserted into the pipe wall of the exhaust horizontal pipe (71). Temperature measuring components (9) are installed on the exhaust diversion pipes (72), and the exhaust diversion pipes (72) are connected to the flow guide (5) through the temperature measuring components (9). A return pipe (73) connected to the inside of the junction box (1) is fixedly inserted into the pipe wall of the exhaust horizontal pipe (71).
4. The low-loss intelligent high and low voltage switchgear according to claim 3, characterized in that, The temperature measuring component (9) includes a temperature measuring box (91) fixed on the outer wall of the junction box (1). The air guide (5) is connected to the air outlet pipe (72) through the temperature measuring box (91). A temperature measuring probe (92) is fixed on the top of the temperature measuring box (91), and the temperature measuring end of the temperature measuring probe (92) is located inside the temperature measuring box (91). The control terminal of the switch cabinet body (2) controls the loose detection unit (8) to work according to the electrical signal fed back by the temperature measuring probe (92).
5. A low-loss intelligent high and low voltage switchgear according to claim 4, characterized in that, The loosening detection unit (8) includes an insulating top cover (81) fixed to the inner side wall of the top of the junction box (1). The bottom of the insulating top cover (81) is fixed with a fixed conductive head (82) and an insulating cylinder (83). The fixed conductive head (82) is located inside the insulating cylinder (83). The bottom of the insulating cylinder (83) is slidably connected with an insulating slide rod (84). The top of the insulating slide rod (84) is fixed with a movable conductive head (85). The bottom of the insulating slide rod (84) is fixed with a hemispherical block (86). The bottom of the crimping nut (4) is fixed with a positioning top pressure block (87). When the positioning top pressure block (87) contacts the lowest point of the hemispherical block (86), the top of the movable conductive head (85) contacts the top of the fixed conductive head (82). The switch cabinet body (2) detects the conduction status of the movable conductive head (85) and the fixed conductive head (82) according to the electrical signal fed back by the temperature probe (92).
6. A low-loss intelligent high and low voltage switchgear according to claim 4, characterized in that, A semiconductor cooler (10) is fixed to the side wall of the sealing cover (61), and the cooling end of the semiconductor cooler (10) is located inside the sealing cover (61). The control end of the switch cabinet body (2) controls the semiconductor cooler (10) to work according to the electrical signal fed back by the temperature probe (92).
7. A low-loss intelligent high and low voltage switchgear according to claim 1, characterized in that, The bottom of the flow guide (5) is provided with several through holes, and a rubber sealing ring (11) is fixed inside the through holes.
8. A low-loss intelligent high and low voltage switchgear according to claim 5, characterized in that, An indicator light (12) is fixed on the outer wall of the insulating cylinder (83), and the indicator light (12) is connected in series with the movable conductive head (85) and the fixed conductive head (82).