Environment-friendly gas insulation PT cabinet

Abstract

The utility model relates to the technical field of medium-voltage distribution network looped network switch equipment, in particular to an environment-friendly gas insulation PT cabinet, which is characterized in that a mechanism chamber is positioned at the front part of a sealed gas box, an instrument chamber is positioned at the top of the mechanism chamber, a pressure relief chamber is positioned below the sealed gas box, and a cable chamber is positioned below the mechanism chamber; a three-position switch device is arranged in the sealed gas tank and is filled with nitrogen or dry air, and the three-position switch device comprises an isolating switch and a grounding switch; the mechanism chamber is internally provided with an isolation / grounding operation mechanism, and the isolation / grounding operation mechanism is used for triggering the opening and closing of the isolation switch. The ring network switch cabinet has the beneficial effects that the pollution of the ring network switch cabinet to the environment is reduced, and the problem that the inter-phase and relative-to-ground insulation capability of conductive parts is insufficient is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medium-voltage distribution network ring network switch equipment, in particular to an environmentally friendly gas-insulated PT cabinet. Background Art

[0002] The existing ring network switchgear in China is mainly gas-filled cabinets, which mainly use SF6 gas. SF6 gas is defined as a restricted greenhouse gas. SF6 decomposes to form toxic sulfur and low-fluorine compounds during arc discharge. In addition, gas-filled cabinets have problems such as gas leakage and environmental pollution, unstable gas pressure, etc. According to statistics, in 2021, the SF6 consumption of ring network cabinets is about 775 tons, equivalent to 18 million tons of CO2. Therefore, it is imperative to use environmentally friendly gases in ring network switchgear and improve the reliability and safety performance of power equipment. Utility Model Content

[0003] The purpose of the utility model is to provide an environmentally friendly gas-insulated PT cabinet, which avoids the emission of SF6 gas by filling nitrogen or dry air in a sealed stainless steel box, reduces the pollution of the ring network switch cabinet to the environment, and solves the problems of unstable gas pressure and leakage by setting the pressure value of nitrogen to normal pressure. In addition, by adopting a three-position switch device in the sealed stainless steel box, the insulation capacity of the disconnector is improved, and the problem of insufficient insulation capacity between phases and relative to the ground of the conductive parts is solved.

[0004] In order to solve the technical problem, the technical solution adopted by the utility model is:

[0005] An environmentally friendly gas-insulated PT cabinet comprises a cabinet body, wherein a sealed gas box, a mechanism chamber, a pressure relief chamber, a cable chamber and an instrument chamber are arranged in the cabinet body, wherein the mechanism chamber is located at the front of the sealed gas box, the instrument chamber is located at the top of the mechanism chamber, the pressure relief chamber is located below the sealed gas box, and the cable chamber is located below the mechanism chamber; a three-position switch device is arranged in the sealed gas box and is filled with nitrogen or dry air, wherein the three-position switch device comprises an isolating switch and a grounding switch; an isolating / grounding operating mechanism is arranged in the mechanism chamber, and the isolating / grounding operating mechanism is used to trigger the opening and closing of the isolating switch.

[0006] Preferably, the sealed air box is 3MM thick and is made of bent 304 stainless steel plate. The switch housing is a fully sealed welded box structure, in which a three-position isolating switch, a grounding switch, and an environmentally friendly H127 straight bushing are installed, and are electrically connected through the upper busbar system and the lower busbar system. A pressure relief assembly is arranged between the sealed air chamber and the pressure relief chamber. The pressure relief assembly is located at the bottom of the partition of the sealed air box, and the pressure relief port faces downward. A pressure gauge for detecting the air pressure in the sealed air box is arranged inside the mechanism room; a grounding stud with a diameter of M16 is designed at the bottom of the sealed air chamber; a fault indicator and a live display are arranged outside the cabinet.

[0007] Preferably, an interlocking assembly is provided on the isolation / grounding operating mechanism, and the isolation / grounding operating mechanism is interlocked with the lower door panel by using the interlocking assembly.

[0008] Preferably, the instrument room is equipped with a power module, a circuit breaker and a voltmeter, which are electrically connected to the voltage transformer. The door panel is fixed at the front by a door hinge, and the voltmeter and door lock are installed on the door panel. During electrical testing, trial operation or maintenance, the door panel can be opened, and the circuit breaker can be opened and closed to control the power supply of the secondary circuit.

[0009] Preferably, the three-position switch device is electrically connected to the environmental protection 259 type bushing through the lower busbar system, and the lower busbar system is composed of the A-phase lower busbar copper bar, the B-phase lower busbar copper bar, and the C-phase lower busbar copper bar. The voltage transformer installed in the cable room is straightly installed on the environmental protection 259 type bushing through a cable with a diameter of 30mm to realize the process of the voltage transformer taking power from the main bus. The lightning arrester is inserted after the voltage transformer, and the voltage transformer lightning arresters of the same phase are arranged in sequence along the bus conductor.

[0010] The beneficial effects of the utility model are as follows: by filling nitrogen or dry air in the sealed gas box instead of SF6 gas as the insulating gas, the emission of SF6 gas is avoided, the pollution of the ring network switch cabinet to the environment is reduced, and by setting the pressure value of the nitrogen to normal pressure, the problem of unstable gas pressure and leakage is solved, and by using a three-position switch device in the sealed stainless steel box, the insulation capacity of the disconnector is improved, and the problem of insufficient insulation capacity between the conductive parts and relative to the ground is solved. This structure has the advantages of safety, environmental protection, compact structure, reliable performance, long service life and convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the main view of an environmentally friendly gas-insulated PT cabinet of the utility model;

[0012] Figure 2 is a structural schematic diagram of the three-position switch device;

[0013] Figure 3 This is a schematic diagram of the internal structure of an environmentally friendly gas-insulated PT cabinet of the utility model;

[0014] Figure 4 It is a side view schematic diagram of an environmentally friendly gas-insulated PT cabinet of the utility model;

[0015] Figure 5 This is a schematic back view of an environmentally friendly gas-insulated PT cabinet of the utility model;

[0016] In the figure: 1. cabinet, 2. gas box, 3. mechanism room, 4. pressure relief room, 5. cable room, 6. instrument room, 7. three-position switch device, 8. isolating switch, 9. grounding switch, 10. isolating / grounding operating mechanism, 11. environmental protection H127 straight bushing, 12. upper busbar system, 13. lower busbar system, 14. pressure relief assembly, 15. barometer, 16. grounding stud, 17. grounding busbar, 18. fault indicator, 19. live display, 20. interlock assembly, 21. lower door panel, 22. power module, 23. air switch, 24. voltmeter, 25. voltage transformer, 26. door panel, 27. door hinge, 28. door lock, 29. environmental protection 259 bushing, 30. A phase lower busbar copper bar, 31. B phase lower busbar copper bar, 32. C Busbar copper bar under the phase, 33, cable, 34, lightning arrester, 35, cable front connector. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] An environmentally friendly gas-insulated PT cabinet comprises a cabinet body 1, wherein a sealed gas box 2, a mechanism chamber 3, a pressure relief chamber 4, a cable chamber 5 and an instrument chamber 6 are arranged in the cabinet body, wherein the mechanism chamber 3 is located at the front of the sealed gas box 2, the instrument chamber 6 is located at the top of the mechanism chamber 3, the pressure relief chamber 4 is located below the sealed gas box 2, and the cable chamber 5 is located below the mechanism chamber 3; a three-position switch device 7 is arranged in the sealed gas box 2 and is filled with nitrogen or dry air, wherein the three-position switch device 7 comprises an isolating switch 8 and a grounding switch 9; an isolating / grounding operating mechanism 10 is arranged in the mechanism chamber 3, and the isolating / grounding operating mechanism 10 is used to trigger the opening and closing of the isolating switch 8.

[0019] By filling the sealed gas box 2 with nitrogen or dry air instead of SF6 gas as the insulating gas, the emission of SF6 gas is avoided, the pollution of the ring network switch cabinet to the environment is reduced, and the pressure value of the nitrogen is set to normal pressure to solve the problems of unstable air pressure and leakage. In addition, by using a three-position switch device 7 in the sealed stainless steel box 2, the insulation capacity of the disconnector is improved, and the problem of insufficient insulation capacity between phases and relative to the ground of the conductive parts is solved.

[0020] Specifically, the sealed air box 2 is 3MM thick and made of 304 stainless steel plate. The switch housing is a fully sealed welded box structure, in which a three-position isolating switch 8, a grounding switch 9, and an environmentally friendly H127 straight bushing 11 are installed, and are electrically connected through an upper busbar system 12 and a lower busbar system 13. A pressure relief component 14 is provided between the sealed air chamber 2 and the pressure relief chamber 4. The pressure relief component 14 is located at the bottom of the interval of the sealed air box 2, and the pressure relief port faces downward, so as to facilitate monitoring of the air pressure strength in the sealed air pressure chamber at any time. A barometer 15 for detecting the air pressure in the sealed air box is provided in the mechanism chamber 3. A grounding stud 16 with a diameter of M16 is designed at the bottom of the sealed air chamber 2. Through the connection between the grounding busbar 17 and the grounding stud 16, protective grounding is done to prevent accidents caused by leakage of electrical equipment. A fault indicator 18 and a live display 19 are provided outside the cabinet, so as to facilitate monitoring of the occurrence of faults at any time.

[0021] Specifically, the isolation / grounding operating mechanism 10 is provided with an interlocking assembly 20, and the isolation / grounding operating mechanism 10 uses the interlocking assembly 20 to interlock with the lower door panel 21 to improve the safety performance of the ring network cabinet. When the upper and lower door panels 21 are closed, the isolation / grounding operating mechanism 10 opens the grounding switch 9, and the lower door panel is locked by the interlocking assembly 20. At this time, the lower door panel 21 cannot be opened. The isolation / grounding operating mechanism 10 continues to turn the isolation switch 8 to the closed position. At this time, the cable chamber 5 is energized, and the energized display 18 works with power, which improves the safety of personnel and equipment.

[0022] Specifically, the instrument room 6 is equipped with a power module 22, a circuit breaker 23 and a voltmeter 24, which are electrically connected to a voltage transformer 25, and take secondary power from it. The intelligent control electrical components of the load switch cabinet provide electrical energy. A door panel 26 is fixed at the front by a door hinge 27. A voltmeter 24 is installed on the door panel 26, which can display the load voltage of the PT cabinet. A door lock 28 is installed on the door panel 26. The door panel can be opened during electrical testing, trial operation or maintenance, and the circuit breaker 23 can be opened and closed to control the power supply of the secondary circuit.

[0023] Specifically, the three-position switch device 7 is electrically connected to the environmental protection 259 type bushing 29 through the lower busbar system 13, and the lower busbar system is composed of the A-phase lower busbar copper bar 30, the B-phase lower busbar copper bar 31, and the C-phase lower busbar copper bar 32. The voltage transformer 25 installed in the cable room installs the cable 33 with a diameter of 30mm straightly on the environmental protection 259 type bushing 29 through the cable front connector 35 to realize the process of the voltage transformer 25 taking power from the main busbar, realizing the seamless connection between the PT cabinet and the load switch ring network cabinet and the direct electrical continuity on the main busbar, reducing the conversion of the intermediate links, saving a lot of cost and space, and reducing electrical fault points and leakage points, and improving the electrical performance and stability of the equipment. The voltage transformer 25 is inserted with a lightning arrester 34, and the voltage transformer lightning arresters 34 of the same phase are arranged in sequence along the bus conductor. The three-position switch device 7 in this embodiment relies on nitrogen or dry air for insulation, thereby truly replacing SF6 gas and causing no pollution to the environment. This structure has the advantages of safety, environmental protection, compact structure, reliable performance, long service life and convenient maintenance.

Claims

1. An environmentally friendly gas-insulated PT cabinet, comprising a cabinet body, wherein the cabinet body is provided with a sealed gas box, a mechanism room, a pressure relief room, a cable room and an instrument room, characterized in that: The mechanism room is located at the front of the sealed gas box, the instrument room is located at the top of the mechanism room, the pressure relief chamber is located below the sealed gas box, and the cable room is located below the mechanism room; a three-position switch device is arranged in the sealed gas box and is filled with nitrogen or dry air, and the three-position switch device includes an isolating switch and a grounding switch; an isolating / grounding operating mechanism is arranged in the mechanism room, and the isolating / grounding operating mechanism is used to trigger the opening and closing of the isolating switch. The sealed gas box is 3MM thick and made of 304 stainless steel plate. The switch housing is a box-type structure with fully sealed welding, in which a three-position isolating switch, a grounding switch, and an environmentally friendly H127 straight bushing are installed, and are electrically connected through the upper busbar system and the lower busbar system. A pressure relief assembly is arranged between the sealed gas box and the pressure relief chamber, and the pressure relief assembly is located at the bottom of the interval of the sealed gas box, with the pressure relief port facing downward, and a pressure gauge for detecting the air pressure in the sealed gas box is arranged in the mechanism room; the bottom of the sealed gas box is designed to have a diameter of M16 grounding stud; a fault indicator and a live display are arranged outside the cabinet; the three-position switch device is electrically connected to the environmental protection 259 type bushing through the lower busbar system; the lower busbar system consists of the A-phase lower busbar copper bar, the B-phase lower busbar copper bar and the C-phase lower busbar copper bar; the voltage transformer installed in the cable room is installed on the environmental protection 259 type bushing in a straight line through a cable with a diameter of 30mm to realize the process of the voltage transformer taking power from the main busbar; the arrester is inserted after the voltage transformer, and the voltage transformer arresters of the same phase are arranged in sequence along the bus conductor.

2. An environmentally friendly gas-insulated PT cabinet according to claim 1, characterized in that: An interlocking assembly is provided on the isolation / grounding operating mechanism, and the isolation / grounding operating mechanism is interlocked with the lower door panel by using the interlocking assembly.

3. The environmentally friendly gas-insulated PT cabinet according to claim 1, characterized in that: The instrument room is equipped with a power module, a circuit breaker and a voltmeter, which are electrically connected to the voltage transformer. The door panel is fixed at the front by a door hinge, and the voltmeter and door lock are installed on the door panel. During electrical testing, trial operation or maintenance, the door panel can be opened to open and close the circuit breaker to control the power supply of the secondary circuit.

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