CN111564767A - Be suitable for switch board of preventing condensation - Google Patents

Abstract

The invention belongs to the field of power distribution equipment, and particularly discloses a power distribution cabinet suitable for preventing condensation. A bus compartment, a cable compartment, a circuit breaker compartment and a control compartment are arranged in the cabinet body. The breaker compartment, the bus compartment, the cable compartment and the condensation removing chamber are communicated in sequence; the input port of the circulating pump is communicated with the output port of the condensation removing chamber, and the output port of the circulating pump is communicated with the input port of the breaker compartment. The condensation removing device consists of a compressor, a condenser, a storage tank, a throttle valve and an evaporator which are sequentially communicated. The evaporator is assembled in the condensation removing chamber, and the storage tank is internally provided with a refrigerant medium. Through the 1 st pipeline intercommunication between evaporimeter and the choke valve, through the 2 nd pipeline intercommunication between evaporimeter and compressor, the 1 st pipeline, the 2 nd pipeline run through respectively except that the lateral wall of condensation room to sealed cooperation. Keep dry environment in the switch board, no condensation forms, increases insulating creepage, avoids taking place the short circuit tripping operation, and the switch board moves steadily safely.

Description

Be suitable for switch board of preventing condensation

Technical Field

The invention relates to a power distribution cabinet, in particular to a power distribution cabinet suitable for preventing condensation, and belongs to the field of power distribution equipment.

Background

The compact narrow and small of inner space of well high voltage distribution cabinet, the interval between electrical elements is less, in humid season, like summer, contains more vapor in the air, can spread in the switch board, air humidity increases in the switch board, easily forms the water film on insulating part, electrified body, the switch board internal surface in the switch board. The production of water film will accelerate the metal body to corrode, leads to the contact surface oxidation, and contact resistance increases for the calorific capacity increase of switch board influences the life of switch board, still reduces the electrical insulation nature between components and parts. If meet cooling weather suddenly, the temperature descends fast in the switch board, leads to the vapor supersaturation in the air in the cabinet, then insulating part, electrified body, the switch board internal surface in the switch board easily forms the condensation, and the drop of water reduces electrical insulation creepage distance between electrical component promptly, and electrical insulation strength descends, causes flashover discharge, alternate short circuit and ground connection short circuit etc. easily arouses switch board fault tripping, brings serious hidden danger for the safety and stability operation of equipment. The current method of eliminating the condensation is to set up the heater in the cabinet, with temperature rising in the cabinet, increase the ability of dissolving water in the air, improve saturated vapor pressure promptly, but the water content does not reduce in the cabinet air, the production of the inevitable water film.

Disclosure of Invention

The invention mainly aims to provide a power distribution cabinet suitable for preventing condensation, and aims to solve the technical problem that the power distribution cabinet in the prior art is easy to generate condensation to cause short-circuit tripping in application. The internal environment of the power distribution cabinet keeps dry, no condensation is formed, the insulation creepage distance is increased, short-circuit tripping is avoided, and the power distribution cabinet stably and safely operates.

In one embodiment, the invention provides a power distribution cabinet suitable for preventing condensation, which comprises a cabinet body 100, wherein the cabinet body 100 is in a closed state; the cabinet 100 is divided into a bus compartment 10 and a cable compartment 20 on the rear side, a breaker compartment 30 and a control compartment 40 on the front side by a metal partition; the busbar compartment 10 is located above the cable compartment 20; the circuit breaker compartment 30 is disposed in the middle of the cabinet 100, with the control compartment 40 located above the circuit breaker compartment 30; the design key points are as follows: further comprising a dewing chamber 60, a circulation pump 70 and a dewing device 80 adapted to remove dews; the circuit breaker compartment 30, the bus compartment 10, the cable compartment 20 and the condensation removing chamber 60 are sequentially communicated, an input port of the circulating pump 70 is communicated with an output port of the condensation removing chamber 60, and an output port of the circulating pump 70 is communicated with an input port of the circuit breaker compartment 30 and is suitable for driving gas in the cabinet to circularly flow; the dewing device 80 is at least composed of a compressor 81, a condenser 82, an evaporator 83, a throttle valve 84 and a storage tank 85, the evaporator 83 is assembled in the dewing chamber 60, and divides the dewing chamber 60 into a wet chamber on the input side and a dry chamber on the output side, and is suitable for removing the moisture in the gas flowing through the dewing chamber; the storage tank 85 is adapted to store a refrigerant medium; the output port of the compressor 81, the condenser 82, the storage tank 85 and the input ports of the throttle valve 84 are sequentially communicated, the output port of the throttle valve 84 is communicated with the input port of the evaporator 83 through a 1 st pipeline, and the output port of the evaporator 83 is communicated with the input port of the compressor 81 through a 2 nd pipeline to form a flow path suitable for the refrigerant medium to circularly flow and remove condensation; the 1 st pipeline and the 2 nd pipeline respectively penetrate through the wall of the condensation removing chamber 60 and are in sealing fit with the wall of the condensation removing chamber 60.

The power distribution cabinet of the embodiment comprises a closed cabinet body, a condensation removing chamber, a circulating pump and a condensation removing device. The interior of the cabinet is divided by a metal partition into a bus compartment, a cable compartment, a circuit breaker compartment and a control compartment. The circuit breaker compartment, the bus compartment, the cable compartment and the condensation removing chamber are sequentially communicated, an input port of the circulating pump is communicated with an output port of the condensation removing chamber, an output port of the circulating pump is communicated with an input port of the circuit breaker compartment, and a circulating flow path for gas flowing in the power distribution cabinet is formed. The condensation removing device consists of a compressor, a condenser, a storage tank, a throttle valve and an evaporator which are sequentially communicated. The storage tank is filled with refrigerant medium. The evaporator is assembled in the condensation removing chamber, the evaporator is communicated with the throttle valve through a 1 st pipeline, and the evaporator is communicated with the compressor through a 2 nd pipeline to form a circulating flow path suitable for flowing of refrigerant media. The 1 st pipeline and the 2 nd pipeline respectively penetrate through the side wall of the condensation removing chamber and are in sealing fit with each other. The compressor is operated and started to drive the refrigerant medium to flow, the heat in the condensation removing chamber is carried out, and the condensation removing chamber is cooled. The circulating pump is controlled and is started, the gas flow in the drive switch board, the gas that flows into except that the condensation room is cooled down, the dissolved quantity of water reduces in the gas, gas and evaporimeter surface action, produce the condensate water on the evaporimeter surface, then the moisture that flows through in removing the condensation room gas is got rid of, form drier gas, this drier gas is sent into in the switch board by the circulating pump, realize reducing the water content of gas in the switch board, keep dry environment in the switch board, avoid the interior component surface of switch board to form water film and condensation, the favourable increase is electric insulation creepage distance, avoid taking place the flashover discharge, cause switch board fault tripping operation such as interphase short circuit and ground connection short circuit, make the switch board operate steadily and safely in humid environment, furthermore, can also reduce the inside temperature of switch board.

Compared with the prior art, the implementation mode has the beneficial technical effects that: through configuration circulating pump and removing the condensation device, get rid of the water content of gas in the switch board, make and keep dry environment in the switch board, avoid the interior component surface of switch board to form water film and condensation, favourable increase electric insulation creepage distance avoids flashover discharge, alternate short circuit and ground connection short circuit etc. to arouse switch board trouble tripping operation, ensures that the switch board operates steadily safely in humid environment.

In another embodiment, the main difference from the above embodiment is that the breaker compartment 30 houses a breaker 32, and the breaker 32 is composed of at least a vacuum bulb 310, an insulating cylinder 320, an electromagnetic driver 330, and a bulletproof device 340, which are connected in sequence in the axial direction; the bulletproof device 340 comprises a closed cylinder 3410, a piston 3421, a piston rod 3422, a drainage device 3430, a check device 3440 and a drainage channel 3450; one end of piston rod 3422 penetrates through end cap 3412 of cylinder 3410 1, and piston 3421 provided in cylinder 3410 is sealingly fixed, piston 3421 dividing the inner space of cylinder 3410 into a rod chamber and a rodless chamber; the drainage device 3430 is disposed in the side wall of the cylinder 3411 of the cylinder 3410 and comprises a drainage valve core 3433, a drainage rod 34332 of the drainage valve core 3433 extends into a rod cavity through the side wall of the cylinder 3411, the surface of the drainage rod 34332 extending into the rod cavity is smooth and cambered, and the side wall of the piston 3421 presses the drainage rod 34332 to trigger drainage of the drainage device 3430; the reverse blocking device 3440 is disposed in the side wall of the cylinder 3411 at the lower end of the cylinder 3411; a 1 st discharge port 3451 is provided in the side wall of the cylinder 3411 for communicating the discharge means 3430 with the check means 3440, the check means 3440 communicating with the rodless chamber through a 2 nd discharge port 3452; the reverse blocking device 3440 prevents the damping medium in the rodless cavity from draining to the rod cavity through the drainage device 3430, and is suitable for inhibiting the reverse bounce generated after the movable contact of the vacuum bubble 310 is switched on.

When the power distribution cabinet is switched on, a piston of the bulletproof device moves towards the direction of the rod cavity, damping media in the rod cavity flow into the rodless cavity through a damping hole in the piston to generate damping force, partial energy of a moving contact of the circuit breaker before switching on is absorbed, the switching-on instantaneous speed of the moving contact is reduced, and the switching-on bounce of the moving contact of the circuit breaker is inhibited; when the piston of the bulletproof device is at the tail end of the stroke, the side wall of the piston presses the end part of the drainage valve core, the drainage valve core moves towards the direction far away from the drainage valve seat, the drainage device is triggered to drain, a damping medium in the rod cavity flows into the rodless cavity through the drainage device, the drainage pore channel and the reverse blocking device, the energy stored by the bulletproof device at the tail end of the stroke is released, the driving force of bouncing after the bulletproof device drives the moving contact of the circuit breaker to be closed is eliminated, and the moving contact of the circuit breaker is further inhibited from generating closing bouncing; after the circuit breaker is switched on, when a moving contact of the circuit breaker generates reverse bounce, the piston of the bulletproof device is driven to move towards the rodless cavity, the drainage device cannot be reset immediately to block circulation, the reverse blocking device is reset immediately to block circulation, damping media of the rodless cavity are prevented from flowing towards the rod cavity through the drainage device, the damping media in the rodless cavity can only flow into the rod cavity through a damping hole in the piston to generate damping force, the energy of reverse bounce of the moving contact is absorbed, and the moving contact is further inhibited from generating reverse bounce.

Compared with the above embodiment, the present embodiment achieves further advantageous technical effects: the bulletproof device absorbs partial energy of the moving contact of the breaker before switching on, eliminates the promoting force of the bulletproof device generated at the stroke end for promoting the reverse bounce of the moving contact, absorbs the energy of the reverse bounce of the moving contact after switching on, and inhibits the moving contact of the breaker from switching on and bouncing, thereby effectively avoiding the moving contact of the breaker from switching on and bouncing and arcing, avoiding the breaker from exploding caused by arcing, and improving the switching-on performance and safety of the power distribution cabinet.

Drawings

Fig. 1 is a left side view schematically illustrating a structure of a power distribution cabinet in an embodiment.

Fig. 2 is a left side view of the gas flow path in the cabinet of fig. 1.

Fig. 3 is a schematic block diagram of the gas flow path in the switch board.

Fig. 4 is a schematic block diagram of a dewing device.

Fig. 5 is a schematic structural diagram of the circuit breaker.

Fig. 6 is a schematic structural diagram of the electromagnetic actuator.

Fig. 7 is a schematic structural view of the bulletproof apparatus.

Fig. 8 is an exploded view of the drainage device and the reverse blocking device.

Wherein, 100-cabinet body, 101-1 st input port, 102-2 nd circulation port, 103-3 rd circulation port, 104-4 th output port, 10-bus compartment, 11-bus copper bar, 12-insulating sleeve, 13-main bus copper bar, 20-cable compartment, 21-current transformer, 22-voltage transformer, 23-grounding knife switch, 24-lightning arrester, 25-outlet copper bar, 26-zero sequence current transformer, 27-outlet cable, 30-breaker compartment, 31-1 st handcart, 32-breaker, 33-inlet contact box, 34-outlet contact box, 40-control compartment, 41-controller, 42-touch screen, 43-terminal bar, 310-vacuum bubble, 320-insulating cylinder, 330-electromagnetic drive, 340-bulletproof, 3410-cylinder, 3411-cylinder, 3412-end cap 1, 3413-end cap 2, 3414-shaft sleeve, 3415-seal ring 1, 3416-seal ring 2, 3420-piston mechanism, 3421-piston, 3422-piston rod, 3423-damping orifice, 3424-seal ring 3, 3425-seal ring 4, 3430-drainage device, 3431-drainage chamber, 3432-drainage valve seat, 3433-drainage valve core, 34331-valve core, 34332-drainage rod, 3434-return spring 1, 3435-end cap, 3440-check device, 3441-check chamber, 3442-check valve seat, 3443-check valve core, 3444-return spring 2, 3445-end cap, 3446-hole, 3450-drainage channel, 3451-discharge channel 1, 3452-discharge channel 2, 50-power chamber, 60-condensation removing chamber, 70-circulating pump, 80-condensation removing device, 81-compressor, 82-condenser, 83-evaporator, 84-throttle valve and 85-storage tank.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

The side face of the power distribution cabinet with the operation panel, namely the side face facing the power distribution cabinet operated by a user, is the front side of the power distribution cabinet, and referring to fig. 1, fig. 1 is a left side view of the power distribution cabinet, the left side of fig. 1 is the rear side of the power distribution cabinet, and the right side is the front side of the power distribution cabinet, namely the side where the operation panel is located; the outward direction of the paper surface of fig. 1 is the left side of the power distribution cabinet, and the inward direction of the paper surface is the right side of the power distribution cabinet. References herein to the medial or lateral sides are made with reference to the center of the described component as being medial.

As an embodiment of the present invention, a power distribution cabinet suitable for preventing condensation is proposed, as shown in fig. 1 to 4, the power distribution cabinet includes a cabinet body 100, a condensation removing chamber 60, a circulation pump 70 and a condensation removing device 80. The cabinet 100 includes a framework and a metal plate, which are used for supporting the structure, and the metal plate and the framework are fixed to form a closed structure. A metal partition fixed to the framework is provided in the cabinet 100, and the internal space of the cabinet 100 is partitioned into a bus compartment 10, a cable compartment 20, a breaker compartment 30, and a control compartment 40 by the metal partition. The bus bar compartment 10 and the cable compartment 20 are provided on the rear side of the cabinet 100, and the bus bar compartment 10 is located above the front side of the cable compartment 20, that is, the upper end of the cable compartment 20 located on the rear side of the bus bar compartment 10 and extending to the top end of the cabinet is located behind the bus bar compartment 10, and as shown in fig. 1, the top end of the cable compartment 20 is flush with the top end of the bus bar compartment 10. The breaker compartment 30 and the control compartment 40 are disposed at the front side of the power distribution cabinet. The circuit breaker compartment 30 is disposed in the middle of the cabinet 100 in front of the bus bar compartment 10, and the circuit breaker compartment 30 is adjacent to the bus bar compartment 10 and the cable compartment 20, respectively. The control compartment 40 is arranged above the front side of the circuit breaker compartment 30 to facilitate a user to view the operating parameters suitable for the switch cabinet and to operate the switch cabinet, i.e. the upper end of the circuit breaker compartment 30, located at the rear side, extending to the top of the cabinet, is located behind the control compartment 40. The top ends of the breaker compartment 30, the cable compartment 20 and the bus bar compartment 10 are located at the top end of the cabinet 100 and have the same height. An airtight power chamber 50 is provided below the breaker compartment 30 and in front of the bus bar compartment 10, and the power chamber 50 is adjacent to each of the cable compartment 20 and the breaker compartment 30. The left and right sides of the frame of the cabinet 100 are fixed with a left metal plate and a right metal plate, which may be formed by one metal plate or a plurality of metal plates. A front cabinet door of the cabinet body 100 is assembled on the front side of the framework, and the front cabinet door comprises a control compartment cabinet door, a breaker compartment cabinet door and a power chamber cabinet door; the rear cabinet door of the cabinet body is arranged on the rear side of the framework, the rear cabinet door comprises a cable compartment cabinet door, and the cable compartment cabinet door comprises a 1 st cable compartment cabinet door positioned right behind the bus compartment and a 2 nd cable compartment cabinet door positioned below the 1 st cable compartment cabinet door. Sealing elements such as sealing strips are arranged on the contact surface of the cable compartment cabinet door and the cabinet body 100 after being covered, so as to realize sealing; a sealing element, such as a sealing strip, is arranged at the contact surface of the cabinet door of the control compartment and the cabinet body 100 after being covered, so as to be suitable for realizing sealing; the contact surface of the breaker compartment door and the cabinet body 100 is provided with a sealing element, such as a sealing strip, to achieve sealing, and the bus compartment 10, the cable compartment 20, the breaker compartment 30, and the control compartment 40 are isolated from the external space of the cabinet body.

The framework of the cabinet 100 is a framework made of steel profiles, such as angle steel welded, and plays a role in structural support, and is a bearing foundation of the power distribution cabinet. The metal partition plates are arranged in the cabinet body 100, and divide the inner space of the cabinet body 100 to form the compartments of the power distribution cabinet. The left metal plate, the right metal plate, the metal partition plates of the compartments and the cabinet doors of the power distribution cabinet are all made of non-magnetic materials, such as aluminum, 200 stainless steel, 201 stainless steel and the like. The bus compartment 10 and the cable compartment 20 share a metal partition plate between adjacent side faces, the metal partition plate is identified as a 1 st metal partition plate, and the 1 st metal partition plate comprises a 1a metal partition plate which is fixedly connected and arranged along the horizontal direction and a 1b metal partition plate which is fixedly connected and arranged along the vertical direction, and is positioned above the inner rear side of the cabinet body 100. The adjacent side surfaces of the circuit breaker compartment 30 and the bus compartment 10 share a metal partition plate, the metal partition plate is marked as a 2 nd metal partition plate, the 2 nd metal partition plate is arranged along the vertical direction, the upper end of the 2 nd metal partition plate is connected with the top plate of the cabinet, and the lower end of the 2 nd metal partition plate is connected with the front end of a 1a metal partition plate arranged along the horizontal direction. The side surfaces of the circuit breaker compartment 30 adjacent to the cable compartment 20 share a metal partition, which is designated as a 3 rd metal partition, the 3 rd metal partition is arranged in a vertical direction, and the upper end of the 3 rd metal partition is connected to the lower end of the 2 nd metal partition. The side surfaces of the power chamber 50 adjacent to the cable compartment 20 share a metal partition plate, the metal partition plate is marked as a 4 th metal partition plate, the 4 th metal partition plate is arranged along the vertical direction, the upper end part of the 4 th metal partition plate is connected with the lower end part of the 3 rd metal partition plate, and the lower end part of the 4 th metal partition plate is connected with the bottom of the cabinet body. The adjacent side surfaces of the circuit breaker compartment 30 and the control compartment 40 share a metal partition plate, which is identified as a 5 th metal partition plate, and the 5 th metal partition plate comprises a 5a th metal partition plate which is fixedly connected and arranged along the horizontal direction and a 5b th metal partition plate arranged along the vertical direction, and is positioned above the inner front side of the cabinet body 100. The side surfaces of the power chamber 50 adjacent to the circuit breaker compartment 30 share a metal partition, which is designated as a 6 th metal partition, the 6 th metal partition is arranged in a horizontal direction, and the rear end of the 6 th metal partition is fixedly connected with the lower end of the 3 rd metal partition.

The cable compartment 20 is a cavity structure enclosed by metal plates and divided by a 1 st metal partition plate, a 3 rd metal partition plate and a 4 th metal partition plate in the cabinet body 100 and is in a closed state; the bus compartment 10 is a cavity structure enclosed by metal plates and divided by a 1 st metal partition and a 2 nd metal partition in the cabinet 100. The circuit breaker compartment 30 is a cavity structure enclosed by metal plates and divided by a 2 nd metal partition plate, a 3 rd metal partition plate, a 6 th metal partition plate and a 5 th metal partition plate in the cabinet 100, and the control compartment 40 is a cavity structure enclosed by metal plates and divided by a 5 th metal partition plate in the cabinet 100. The closed state may have, physically, through holes, called through-wall holes, suitable for the passage of the wires, suitable for the communication between adjacent compartments; the electromagnetic structure means that electromagnetic waves in the compartments do not leak outwards, and the effect of no electromagnetic interference between adjacent compartments is realized, so that the robustness of the power distribution cabinet is improved. The power chamber 50 is of an unsealed structure so as to exchange heat with the outside.

The metal partition plate at the bottom of the breaker compartment 30 is provided with the 1 st input port 101 suitable for gas to flow in, that is, the 1 st input port 101 is a through hole suitable for gas to flow through and is formed by a plurality of slits, and the slit type through hole has little influence on electromagnetic isolation, which is beneficial to keeping the 6 th metal partition plate with good electromagnetic isolation function. A 2 nd circulation port 102 suitable for gas circulation is provided in a vertically arranged metal partition plate which is used for the circuit breaker compartment 30 and the bus bar compartment 10 in adjacent and common, that is, the 2 nd circulation port 102 is provided in a through hole of the 2 nd metal partition plate and is positioned at the top end part of the 2 nd metal partition plate; the 2 nd circulation port 102 is formed by a plurality of slit-type through holes, and the slit-type through holes have a small influence on electromagnetic isolation, which is advantageous for maintaining a good electromagnetic isolation function of the 2 nd metal separator. The 3 rd through hole 103 suitable for gas circulation is arranged on the horizontally arranged metal partition board which is used for the bus compartment 10 and the cable compartment 20 to be adjacent, namely, the 3 rd through hole 103 is arranged on the through hole of the 1a metal partition board, the through hole is composed of a plurality of slits, and the slit type through hole has small influence on electromagnetic isolation, so that the 1a metal partition board can maintain good electromagnetic isolation effect. The metal partition plate on one side of the bus compartment 10, such as the metal partition plate on the front side, is provided with a 4 th output port 104 suitable for gas outflow, that is, the 4 th output port 104 is provided with a through hole on the 4 th metal partition plate, the through hole is composed of a plurality of slits, and the slit type through hole has little influence on electromagnetic isolation, which is beneficial to keeping the 4 th metal partition plate with good electromagnetic isolation function. The 4 th outlet 104 is located at the bottom end of the 4 th metal partition, near the bottom of the cabinet 100. The input port of the dewing chamber 60 is connected to the 4 th output port 104 of the cable compartment 20 through a pipe. The 2 nd circulation port 102 and the 3 rd circulation port 103 are provided so that the breaker compartment 30, the bus bar compartment 10, and the cable compartment 20 are communicated in this order.

The dewing chamber 60 is assembled in the power compartment 50 and fixed to the bottom of the cabinet 100. The dew condensation removing chamber 60 is a closed cavity surrounded by a metal plate, such as a rectangular parallelepiped cavity. Alternatively, the dewing chamber 60 and the cable compartment 20 are adjacently fitted, and a metal partition, i.e., the above-mentioned 4 th metal partition, is shared at the adjacent side of the dewing chamber 60 and the cable compartment 20. When the 4 th outlet 104 is provided in a metal partition plate which is used for the condensation removing chamber 60 and the cable compartment 20 in common, that is, the 4 th metal partition plate, the inlet of the condensation removing chamber 60, through which the gas flows into the cabinet 100, and the outlet of the cable compartment 20, through which the gas flows out, share one inlet, that is, the 4 th outlet 104 serves as the outlet of the cable compartment 20 and also serves as the inlet of the condensation removing chamber 60. Therefore, the condensation removing chamber 60 is matched with the cable compartment 20, a communicating pipeline between the condensation removing chamber and the cable compartment can be omitted, and more importantly, the arrangement of elements in the power distribution cabinet is more compact, so that the miniaturization of the power distribution cabinet is facilitated. The top end of the dewing chamber 60 is provided with an outlet for the outflow of the dry gas. The circulation pump 70 is disposed above the dewing chamber 60, and is fitted and fixed to the cabinet 100. The input port of the circulating pump 70 is connected with the output port above the condensation removing chamber 60 through a pipeline, and the output port of the circulating pump 70 is communicated with the 1 st input port 101 through a pipeline. The breaker compartment 30, the bus compartment 10, the cable compartment 20, the condensation removing chamber 60, and the circulation pump 70 are sequentially connected to form a circulation flow path suitable for the gas in the cabinet 100 to flow as shown in fig. 2 and 3, so that the gas in the cabinet flows in a circulation manner, the moisture in the cabinet can be brought into the condensation removing chamber 60, and the condensation removing chamber 60 removes the moisture in the gas, thereby keeping the interior of the power distribution cabinet dry. Further, a gas transmission solenoid valve 71 and a gas storage tank 72 can be connected in series between the circuit breaker compartment 30 and the circulating pump 70 in sequence, as shown in fig. 3, so that gas flows smoothly and the pressure in the cabinet is kept stable.

The above-described dew condensation removing device 80, as shown in fig. 4, includes a compressor 81, a condenser 82, an evaporator 83, a throttle valve 84, and a storage tank 85. The storage tank 85 stores refrigerant medium as a pressure tank; the cooling medium is ammonia refrigerant, which is beneficial to reducing energy consumption. A compressor 81, a condenser 82, a throttle valve 84, and a storage tank 85 are assembled in the power room 50. The condenser 82 is assembled on the right side of the power chamber 50, the metal plate on the right side of the power chamber 50 is provided with a ventilation and heat dissipation hole suitable for heat dissipation, the heat dissipation hole is in a shape of a plurality of long and thin slits, and the heat dissipation hole and the condenser 82 are arranged in a positive phase opposite mode, so that the heat dissipation effect is enhanced. The inner side of the condenser 82 is provided with a fan, which blows air to the condenser 82 and flows out of the power chamber 50 through the air-blowing heat-dissipation holes, and is adapted to enhance the heat dissipation of the condenser 82. An output port of the compressor 81 is communicated with an input port of the condenser 82 through a copper pipe, an output port of the condenser 82 is communicated with an input port of the storage tank 85 through a copper pipe, and an output port of the storage tank 85 is communicated with an input port of the throttle valve 84 through a copper pipe. It is understood that the compressor 81, the condenser 82, the storage tank 85, and the throttle valve 84 are communicated in this order.

The evaporator 83 is fitted in the dewing chamber 60, and the evaporator 83 divides the inside of the dewing chamber 60 into a wet chamber at a gas input side and a dry chamber at a gas output side. The output port of the throttle valve 84 is communicated with one end of the 1 st pipeline, as shown in fig. 4, the other end of the 1 st pipeline penetrates through the side wall of the condensation removing chamber 60, extends into the condensation removing chamber 60, is communicated with the input port of the evaporator 83 arranged in the condensation removing chamber 60, and the 1 st pipeline is tightly matched with the side wall of the condensation removing chamber 60, sealed by a sealing ring if used, and fixed. An output port of the evaporator 83 is fixedly connected to one end of the 2 nd pipe, and the other end of the 2 nd pipe penetrates the side wall of the condensation chamber 60, extends to the outside of the condensation chamber 60, and is fixedly connected to an input port of the compressor 81 located outside the condensation chamber 60. The 2 nd pipeline is closely matched with the side wall of the condensation removing chamber 60, sealed by a sealing ring and fixed. The 1 st pipeline and the 2 nd pipeline are copper pipelines. The output port of the compressor 81, the condenser 82, the storage tank 85, the throttle valve 84, the evaporator 83 and the input port of the compressor 81 are sequentially communicated to form a refrigerant flow path suitable for the circulation flow of the refrigerant medium; the refrigerant medium carries away the heat in removing the condensation room 60, removes the condensation room 60 and is cooled down, flows in and removes the gas and the evaporimeter 83 heat transfer cooling in the condensation room 60, and the dissolved quantity of water reduces in the gas, and this gas and evaporimeter 83 surface contact effect form the condensate water on the evaporimeter 83 surface, realize getting rid of the moisture that flows in the gas. The dewing chamber 60 is provided with a water tray which is positioned right below the evaporator 83 and is adapted to receive condensed water formed on the outer surface of the evaporator 83. A water outlet is arranged below the water containing tray, the water outlet is communicated with and fixed with a water discharge pipe, and the water discharge pipe is positioned outside the cabinet body 100 and is suitable for discharging the water collected by the water containing tray to the outside of the cabinet body. The drain pipe is fitted with a drain valve adapted to control the draining, preferably an electromagnetic valve, called drain electromagnetic valve, and the water tray is fitted with a water level sensor adapted to detect the water level in the water tray. The drainage electromagnetic valve and the water level sensor are respectively and electrically connected with a controller 41 of the power distribution cabinet, the controller 41 is suitable for acquiring the water level in the water containing tray, when the water level detection value is larger than a preset water level value, the drainage electromagnetic valve is operated to open for drainage, and the water level is stopped until the water level value detected by the water level sensor is zero. To avoid air entering the dewing chamber 60 through the drain pipe during draining, the circulation pump 70 may be operated to stop, or to reduce the rotational speed, during draining. In order to improve the moisture removal effect, as an improvement, the evaporator 83 is vertically arranged, the evaporator 83 is matched and assembled with the condensation removal chamber 60, the bottom of the evaporator 83 is a wet chamber, the top of the evaporator is a dry chamber, and gas to be dehumidified flows in from the bottom side of the evaporator 83 and flows out from the top side after acting with the surface of the evaporator 83, so that the area of the contact action between the gas to be dehumidified and the surface of the evaporator 83 is increased, and the water removal effect is improved.

The condenser 82 and the evaporator 83 have the same structure, and the condenser 82 will be described as an example. The condenser 82 may alternatively be a tube heat exchanger, as shown in FIG. 2, including heat pipes adapted for circulation of a refrigerant medium and fins adapted for enhanced heat exchange. The heat pipe is a copper pipe made of pure copper, and the fins are thin sheets made of pure copper. The fins are arranged in parallel at equal intervals to form a cuboid structure. The heat pipes are arranged in a serpentine circuitous state and sequentially penetrate through the fins to form the tubular heat exchanger in a cuboid shape. One end of the heat pipe, which is suitable for the refrigerant medium to flow into, is referred to as an input port of the condenser, and the other end is referred to as an output port of the condenser, as shown in fig. 2.

The operating principle of the power distribution cabinet of the above embodiment is as follows: the switch board is by the start-up operation at the work place, when the air of work place is more moist, need get rid of the steam in the internal gas of cabinet to make the internal drying that keeps of cabinet, then the compressor is controlled and is started, and compressor drive refrigerant medium flows, will remove the indoor heat of condensation and take away, removes the condensation room and is cooled down. The circulating pump is operated and started, the gas in the driving power distribution cabinet circulates and flows, the gas flows into the condensation removing chamber, the gas exchanges heat with the evaporator and is cooled, the dissolving amount of moisture in the gas is reduced, the gas flows through the evaporator and acts on the surface of the evaporator, condensed water is generated on the surface of the evaporator, the condensed water is collected and flows into the water containing disc and is periodically discharged through the water outlet of the water containing disc, moisture in the gas flowing through the condensation removing chamber is removed, and dry gas is formed and is discharged through the output port of the condensation removing chamber. The circulating pump will remove in the switch board is sent into to the drier gas of the delivery outlet of condensation room, flow through circuit breaker compartment 30 in proper order promptly, generating line compartment 10, cable compartment 20, flow into from cable compartment 20 again and remove the condensation room, obtain drier gas after dehumidifying once more, this drier gas is carried the switch board by the circulating pump once more, so circulation, realize reducing the water content of gas in the switch board, the internal gas of cabinet keeps the dry state, can reduce the temperature of switch board in addition, the temperature that makes the switch board keeps its required lower temperature of normal operating. The dry environment is kept in the power distribution cabinet, so that the surfaces of elements in the power distribution cabinet are prevented from forming water films and condensation, the electric insulation creepage distance is favorably increased, the fault tripping of the power distribution cabinet caused by flashover discharge, interphase short circuit, grounding short circuit and the like is avoided, and the power distribution cabinet stably and safely operates in a wet environment; and the unit gas spare is by aqueous vapor corrosion in the suppression switch board, extension switch board life.

Compared with the prior art, the above embodiment has the beneficial technical effects that: through configuration circulating pump and removing the condensation device, get rid of the water content of gas in the switch board, make and keep dry environment in the switch board, avoid the interior component surface of switch board to form water film and condensation, favourable increase electric insulation creepage distance, avoid flashover discharge, alternate short circuit and ground connection short circuit etc. to arouse switch board trouble tripping operation, and restrain the interior component of switch board by aqueous vapor corrosion, ensure that the switch board operates steadily safely in humid environment, have longer life.

The circulation pump 70 and the compressor 81 configured in the power distribution cabinet are started and then always run, and if the air is dry, the waste of electric energy is caused. In order to solve the technical problem, the power distribution cabinet is further improved as follows.

The power distribution cabinet is further provided with a humidity sensor and a temperature sensor, and the controller 41 is internally provided with a corresponding relation between humidity and temperature, which can be understood as a relational expression. A humidity sensor assembly cabinet 100, such as the cable compartment 20, adapted to detect the humidity of the gas within the cabinet 100; the temperature sensor is mounted within the cabinet 100, such as within the cable compartment 20, and is adapted to sense the temperature of the gas within the cabinet 100. The circulation pump 70 is electrically connected to the controller 41 via a drive circuit, the compressor 81 is electrically connected to the controller 41 via a drive circuit, the humidity sensor is electrically connected to the controller 41 via a humidity conversion circuit, and the temperature sensor is electrically connected to the controller 41 via a temperature conversion circuit. The correspondence between humidity and temperature can be understood as a table, which includes a "humidity" field and a "temperature" field, and records the correspondence between humidity and temperature, that is, the maximum dissolution amount of the moisture dissolved in the air at each temperature; it can also be understood as an expression, and a functional expression between humidity and temperature is recorded, namely a relation of the maximum dissolving amount of the moisture in the air with the change of the temperature, namely a function relation of the water dissolving amount and the temperature. The controller 41 acquires a humidity detection value and a temperature detection value of the interior of the cabinet detected by the humidity sensor and the temperature sensor, and calculates a humidity calculation value corresponding to the temperature detection value based on the temperature detection value by using the correspondence between the humidity and the temperature, such as a functional expression between the humidity and the temperature; and calculating a relative error between the humidity calculation value and the humidity detection value based on the humidity calculation value, specifically as follows: and the quotient of the difference value of the calculated humidity value and the detected humidity value and the calculated humidity value. The relative error is a value smaller than 1, and may be a positive number or a negative number, and the negative number indicates supersaturation of water dissolved in the gas. And finally, comparing the relative error obtained by calculation with a preset condensation removing threshold value, and making a result that the relative error obtained by calculation is larger than the condensation removing threshold value or a result that the relative error obtained by calculation is smaller than the condensation removing threshold value. When the calculated result that the obtained relative error is smaller than the condensation removing threshold value indicates that the dissolved amount of water in the gas in the power distribution cabinet is large and the gas is humid, the controller 41 generates a control signal to operate the circulating pump 70 and the compressor 81 to start so as to carry out condensation removing operation; when the result that the relative error obtained by calculation is larger than the condensation removing threshold value is made, the dissolved amount of the gas moisture in the power distribution cabinet is small, the gas is dry, and the controller 41 generates a control signal to operate the circulating pump 70 and the compressor 81 to stop. In order to realize removing the intelligent operation of condensation to the switch board, when gaseous in the switch board is more moist, circulating pump 70, compressor 81 start, remove the condensation and handle, when gaseous in the switch board is drier, circulating pump 70, compressor 81 stop, do not remove the condensation and handle, do benefit to save the electric energy. The humidity is absolute humidity, and relative humidity can be selected for expression. When the detected humidity value output from the humidity sensor is relative humidity, the absolute humidity, that is, the above-mentioned "humidity" is obtained by converting the detected humidity value by "absolute humidity/maximum absolute humidity with same temperature" and by looking up the "relationship table between maximum absolute humidity and temperature".

The 1 st input port 101 of the breaker compartment 30 is further modified to inhibit turbulence of the gases within the cabinet to enhance dewing. The 1 st input port 101 is provided on the 6 th metal partition plate, and is located right below the breaker 32, that is, right below the breaker 32 in the "operating position", and the area of the 1 st input port 101 is larger than 50% of the area of the orthographic projection of the breaker 32 from the top to the bottom. The 1 st input port 101 includes a plurality of slits formed in the 6 th metal separator and a ring-shaped flange portion fixed below the metal separator and surrounding the plurality of slits, wherein the flange portion and the 6 th metal separator may be vertically disposed below the 6 th metal separator, and the flange portion surrounds the plurality of slits formed in the 6 th metal separator, as shown in fig. 2. The output port of the circulating pump 70 is communicated with the 1 st input port 101 through a reducer pipe, specifically, the output port of the circulating pump 70 is communicated with the small-diameter port of the reducer pipe in a sealing manner and is fixed through a flange, and the large-diameter port of the reducer pipe is matched with the flange part of the 1 st input port 101 in a sealing manner and is fixed through the flange. After the improvement, the dry air delivered by the circulating pump 70 is dispersed and delivered into the breaker compartment 30 through the 1 st input port 101, the gas flow rate is greatly reduced, the turbulent flow formation is favorably inhibited, the action area of the gas and a gas element of the breaker compartment is larger, the gas is favorably carried with moisture, and the environment of the breaker compartment is drier; in addition, it is advantageous to dissipate heat from the circuit breaker compartment 30, maintaining a lower temperature, and allowing it to operate more stably.

The circuit breaker compartment 30, as shown in fig. 1, has a 1 st rail, a 1 st trolley 31, a circuit breaker 32, an incoming line contact box 33, and an outgoing line contact box 34 built therein. One end part of the incoming line contact box 33 penetrates through a partition plate between the breaker compartment 30 and the bus compartment 10, namely a 2 nd metal partition plate, and extends into the bus compartment 10, the incoming line contact box 33 is fixed with the cabinet body, and an insulating sleeve is arranged to realize insulating isolation; one end part of the outgoing line contact box 34 penetrates through a partition plate between the circuit breaker compartment 30 and the cable compartment 20, namely a 3 rd metal partition plate, extends into the cable compartment 20, and the outgoing line contact box 34 is fixed with the cabinet body and is provided with an insulating sleeve to realize insulating isolation. The 1 st rail is fixed at the bottom of the circuit breaker compartment 30, and the 1 st rail is arranged along the front-back direction of the power distribution cabinet, i.e. the left-right direction shown in fig. 1. The 1 st handcart 31 is matched with the 1 st guide rail, and the 1 st handcart 31 can reciprocate back and forth along the 1 st guide rail. The circuit breaker 32 is assembled on the first trolley 31 and fixed, an incoming line contact 316 of the circuit breaker 32 is coaxially matched with a contact hole of the incoming line contact box 33, which is suitable for the incoming line contact 316 to be inserted, and an outgoing line contact 317 of the circuit breaker 32 is coaxially matched with a contact hole of the outgoing line contact box 34, which is suitable for the outgoing line contact to be inserted. And the 1 st trolley 31 is operated to reciprocate back and forth along the 1 st guide rail, so that the circuit breaker 32 is switched between a test position and a working position.

In which, as shown in fig. 1, the cable compartment 20 is internally provided with a current transformer 21, a voltage transformer 22, a grounding switch 23, a lightning arrester 24, an outgoing line copper bar 25 and a zero sequence current transformer 26. The current transformer 21 is arranged at the rear side of the cable compartment 20 and is fixed with a framework of the power distribution cabinet; the voltage transformer 22 is arranged at the rear side of the cable compartment 20 and fixed with the framework of the power distribution cabinet, and the voltage transformer 22 is positioned right below the current transformer 21, as shown in fig. 1; the grounding knife switch 23 is arranged on the front side of the cable compartment 20 and fixed with the framework of the power distribution cabinet. The current transformer 21 is used to detect three-phase currents of three-phase power. An incoming wiring terminal of the current transformer 21 is fixed and electrically connected with one end of a 1 st conductive copper bar, and the other end of the 1 st conductive copper bar is respectively fixed and electrically connected with three wiring terminals of an outgoing contact box 34; an outlet wiring terminal of the current transformer 21 is fixed and electrically connected with one end of the outlet copper bar 25, and the other end of the outlet copper bar 25 is fixed with the rear side of the cable compartment 20 through an insulator. The earthing knife-switch 23 also comprises a knife-switch operating mechanism which is suitable for operating the earthing knife-switch to realize earthing and earthing disconnection operations. The knife switch operating mechanism is mounted on the top of the power compartment 50, and its operating handle is arranged on the front side of the switch cabinet, below the breaker compartment 30. One end of the 2 nd conductive copper bar is fixed and electrically connected with the outgoing copper bar 25, and the other end of the 2 nd conductive copper bar is fixed and electrically connected with the wiring end of the grounding disconnecting link 23. The other end of the outgoing copper bar 25 and the three-phase line of the outgoing cable 27 disposed in the cable compartment 20 are fixed and electrically connected, respectively. The lightning arrester 24 is a zinc oxide lightning arrester, and three lightning arresters 24 are fixed at the bottom of the cable compartment 20 through a mounting frame. One terminal of the lightning arrester 24 is electrically connected to a terminal of the earthing switch 23, and the other terminal is electrically connected to an earthing bar provided at the bottom of the cable compartment 20. The outgoing cable 27 is a power cable for transmitting the electric power flowing through the distribution cabinet to the outside, and is a three-phase three-wire system to accommodate the transmission of the electric power. The outgoing cable 27 extends into the cable compartment 20 from an incoming line hole at the bottom of the power distribution cabinet, as shown in fig. 1, the outgoing cable 27 is fixed and electrically connected with the other end of the outgoing copper bar 25, and then the outgoing cable 27, the current transformer 21 and the outgoing contact box 34 are electrically connected in sequence; the outgoing cable 27, the lightning arrester 24 and the grounding bar are electrically connected in sequence. The zero sequence current transformer 26 is sleeved outside the outgoing cable 27. The three connection ends of the voltage transformer 22 are respectively and electrically connected with the outgoing line copper bar 25 so as to detect the load voltage of the power distribution cabinet.

As shown in fig. 1, the bus compartment 10 is provided with a bus bar copper bar 11, an insulating sleeve 12, and an insulator. The field that the switch board was used is provided with main bus-bar copper bar 13, and main bus-bar copper bar 13 is three, adopts three-phase three-wire system promptly. The main bus copper bars 13 are respectively used for transmitting three-phase electric energy outside the power distribution cabinet to the power distribution cabinet, and if the electric energy on the low-voltage side of the transformer is transmitted to the power distribution cabinet. The main bus copper bar 13 is of a strip structure with a rectangular cross section, and corresponding rectangular holes are formed in the wall-through partition plates (such as a left metal plate and a right metal plate) of the bus compartment, so that the electromagnetic shielding effect of the wall-through partition plates is favorably enhanced. The bus copper bar 11 is made of red copper and has a strip-shaped structure with a rectangular cross section. The main bus copper bar 13 penetrates through a left metal plate of the power distribution cabinet and extends into the bus compartment 10, and the main bus copper bar 13 is fixed with the bus compartment 10 through an insulator. An insulating sleeve 12 is arranged between the main bus copper bar 13 and the left metal plate, and the insulating sleeve 12 protrudes out of the two side faces of the left metal plate, so that the insulating creepage distance is increased, the electric insulating property is improved, and the electric insulating isolation between the main bus copper bar 13 and the left metal plate is ensured. The number of the bus copper bars 11 is three, namely a three-phase three-wire system. One end of the bus copper bar 11 is fixed and electrically connected with the main bus copper bar 13, and the other end of the bus copper bar 11 is fixed and electrically connected with the wiring end of the incoming line contact box 33.

The control compartment 40 houses a controller 41, a touch screen 42, and a terminal block 43. The controller 41 may be formed by a PLC, such as a PLC module of siemens S7-300 model available from siemens inc. In this example, the controller 41 is specifically configured by a CPU 315-2DP processor module, an SM 321 digital input module, an SM 322 digital output module, an SM 331 analog input module, an SM 332 analog output module, an S7307 power supply module, and a CP 340 communication interface module. The terminal block 43 is fixed to a frame at a rear side of the control compartment 40, i.e., a common metal partition between the control compartment 40 and the breaker compartment 30. The circuit breaker 32, the current transformer 21 and the voltage transformer are respectively electrically connected with the controller 41; the touch screen 42 is electrically connected to the controller 41. The controller 41 is adapted to control the circuit breaker 32 to switch on and off, and to control the on and off of the primary loop; the controller 41 is adapted to obtain the opening and closing states of the circuit breaker 32, the phase current, the phase voltage and the line voltage of the three-phase power, and respectively display the opening and closing states, the phase current, the phase voltage and the line voltage on the touch screen 42.

As shown in fig. 5, the breaker 32 includes a vacuum bulb 310, an insulating cylinder 320, an electromagnetic actuator 330, and a bulletproof device 340, which are fixedly connected in the axial direction. The bulletproof device 340, as shown in fig. 7, includes a closed cylinder 3410, a piston 3421, a piston rod 3422, a discharge device 3430, a check device 3440, and a discharge passage 3450. The cylinder 3410 includes a 1 st end cap 3412, a cylinder 3411, and a 2 nd end cap 3413, which are hermetically fixed in this order. One end of piston rod 3422 extends through end cap 3412 of 1 st cylinder block 3410 and is sealingly fixed to piston 3421 provided in cylinder block 3410, and piston 3421 divides the inner space of cylinder block 3410 into a rod chamber and a rodless chamber. The drainage device 3430 is disposed in the sidewall of the cylinder 3411, and is disposed radially, and includes a drainage valve core 3433, a drainage rod 34332 of the drainage valve core 3433 extends through the sidewall of the cylinder 3411 and into the rod chamber, and the outer surface of the end portion extending into the rod chamber has a smooth curved surface, so that the sidewall of the piston 3421 presses the end portion of the drainage valve core 3433 having a smooth curved surface to trigger drainage of the drainage device 3430. The reverse blocking device 3440 is provided in the side wall of the cylinder 3411 at the lower end portion of the side wall of the cylinder 3411, arranged in the axial direction of the cylinder 3411. The drainage apertures 3450 include a 1 st drainage aperture 3451 and a 2 nd drainage aperture 3452. The 1 st discharge port 3451 is provided in the side wall of the cylinder 3411, arranged in the axial direction of the cylinder 3411; the 2 nd discharge port 3452 is provided in the side wall of the cylinder 3411, arranged radially of the cylinder 3411, and has one end portion communicating with the rodless chamber. The 1 st discharge passage 3451 communicates with the discharge device 3430 and the check device 3440, and the check device 3440 communicates with the other end portion of the 2 nd discharge passage 3452. The reverse blocking device 3440 prevents the damping medium in the rodless cavity from draining to the rod cavity through the drainage device 3430, and the damping medium in the rodless cavity can only drain to the rod cavity through the damping hole 3423 on the piston 3421, so that the reverse blocking device is suitable for inhibiting the reverse bounce generated after the moving contact of the vacuum bubble 310 is switched on.

As shown in fig. 5, the vacuum bulb 310 includes a vacuum chamber 311, a movable contact 312, a movable contact rod 313, a fixed contact 314, and a fixed contact rod 315. The vacuum chambers 311 are arranged in the up-down direction. The movable contact 312 and the fixed contact 314 are disposed in the vacuum chamber 311, the movable contact 312 and the fixed contact 314 are disposed oppositely, preferably oppositely and in parallel, and the movable contact 312 is located below the fixed contact 314. The upper end of the vacuum chamber 311 is provided with an upper through hole, and the lower end thereof is provided with a lower through hole. The lower end of the static contact rod 315 extends into the vacuum chamber 311 from the upper through hole at the upper end of the vacuum chamber 311, the lower end of the static contact rod 315 is fixed with the static contact 314, and the static contact rod 315 is hermetically matched with and fixed to the upper through hole of the vacuum chamber 311, i.e. the static contact rod 315 is hermetically fixed with the vacuum chamber 311. The upper end of the movable contact bar 313 extends into the vacuum cavity 311 from the lower through hole of the lower end of the vacuum cavity 311, the upper end of the movable contact bar 313 and the movable contact 312 are fixed, the movable contact bar 313 and the lower through hole of the vacuum cavity 311 are in sealing fit and are assembled in a sliding way, so that the movable contact bar 313 can move up and down relative to the vacuum cavity 311 and maintain a sealing state. Such as with a bellows.

As shown in fig. 5, the insulation cylinder 320 includes an insulator 321, an upper shaft 326 and a lower shaft 327. The lower end of the movable contact rod 313 is fixedly connected, preferably coaxially mated, with the upper end of the upper shaft rod 326. The insulator 321 has a cylindrical shape and is made of an insulating ceramic, such as alumina ceramic. The outer side of the insulator 321 is provided with a plurality of sheds circumferentially surrounding along the side to increase the insulation creepage distance and enhance the electrical insulation and isolation effect. The upper shaft 326 and the lower shaft 327 may be made of steel, such as stainless steel, or may be made of an insulating ceramic, such as an alumina ceramic. Alternatively, the upper shaft 326 is made of stainless steel and the lower shaft 327 is made of an insulating ceramic to enhance electrical isolation. The lower end of the upper stem 326 is fixed to the upper end of the insulator 321, and the upper end of the lower stem 327 is fixed to the lower end of the insulator 321. The upper shaft 326, insulator 321, and lower shaft 327 are coaxially aligned. Under the electrical insulation and isolation action of the insulator 321, the upper shaft 326 and the lower shaft 327 are electrically insulated and isolated from each other.

As shown in fig. 6, the electromagnetic actuator 330 includes a cylindrical actuator cylinder 3310, an actuator upper end cap 3320, an actuator lower end cap 3330, a permanent magnet 3313, an iron core 3360, and an actuator output shaft 3370. The actuator cylinder 3310 is cylindrical and has open upper and lower ends. The actuator cylinder 3310 has a 1 st insert 3311 and a 2 nd insert 3312 built therein. The 1 st and 2 nd caulking grooves 3311 and 3312 are located inside the wall of the driver cylinder 3310, respectively circumferentially surrounding; the 1 st caulking groove 3311 is provided at an upper end portion of the driver cylinder 3310, and the 2 nd caulking groove 3312 is provided at a lower end portion of the driver cylinder 3310. A 1 st coil 3340 is assembled and fixed in the 1 st caulking groove 3311 and is suitable for driving a breaker to close; the 2 nd coil 3350 is fitted and fixed in the 2 nd caulking groove 3312 and adapted to drive the opening of the circuit breaker. The permanent magnets 3313 are fixed on the inner wall of the driver cylinder 3310 at the middle region of the driver cylinder 3310, i.e., between the 1 st coil 3340 and the 2 nd coil 3350, arranged along the circumferential direction of the inner wall of the driver cylinder 3310. The core 3360 is disposed within the cylinder 310 and the core 3360 is mounted on the exterior of the driver output shaft 3370 and is fixed to the driver output shaft 3370 in a central region of the driver output shaft 3370. The iron core 3360 is located within circumferentially arranged permanent magnets 3313, coaxially mated. The driver upper end cap 3320 is fixed to the upper end of the driver cylinder 3310, and the upper end of the driver output shaft 3370 extends through a through hole in the middle of the driver upper end cap 3320; the lower end cap 3330 of the actuator is fixed to the lower end of the actuator cylinder 3310, and the lower end of the actuator output shaft 3370 extends through a through hole formed in the middle of the lower end cap 3330. The upper end of the driver output shaft 3370 is fixed to, and further coaxially engages, the lower end of the lower shaft 327.

As shown in fig. 7, the cylinder 3410 of the bulletproof unit 340 includes a cylindrical cylinder 3411, a 1 st end cap 3412, and a 2 nd end cap 3413. The cylinder 3411 upper and lower both ends open, the 1 st end cover 3412 covers and closes the upper end opening of the cylinder 3411 and realizes sealing and fixing through the integrated molding mode; the 2 nd end cap 3413 is fitted over the lower end opening of the cylinder 3411 and fixed, and the 1 st sealing ring 3415 seals between the 2 nd end cap 3413 and the cylinder 3411. The piston mechanism 3420 includes a piston 3421 and a piston rod 3422. The piston 3421 is disposed inside the cylinder 3410, one end of the piston 3422 penetrates through the through hole in the middle of the first end cap 3412, extends into the cylinder 3410, and is fixed to the piston 3421, and the space between the piston 3422 and the through hole in the middle of the piston 3421 is sealed by the 3 rd sealing ring 3424; the piston rod 3422 and the 1 st end cap 3412 middle through hole between the sealing through 2 nd sealing ring 3416, the shaft pressure sleeve 3414 is installed in the piston rod 3422, and with the 1 st end cap 3412 fixed, for the extrusion limit 2 nd sealing ring 3416, ensure good sealing effect. The piston 3421 and the inner wall surface of the cylinder 3411 are sealed by a 4 th seal ring 3425. Piston 3421 divides the internal space of cylinder 3410 into a rod chamber located above and a rodless chamber located below, as shown in fig. 7. The piston 3421 is provided with a damping hole 3423, as shown in fig. 7, adapted to allow a damping medium to flow between the rod chamber and the rodless chamber to release the energy stored by the compressed damping medium, so as to generate a damping force and absorb a part of the energy of the movable contact of the circuit breaker. The area of the damping hole 3423 is 0.6-1.3%, preferably 0.8% of the area of the piston 3421, and the effect of suppressing the closing bounce is good. The cylinder 3410 is filled with a damping medium, which is preferably nitrogen, and may be other inert gases such as helium and neon. Cylinder 3410 is charged with high pressure nitrogen, preferably at 2.6 atm. The 2 nd end cap 3413 is provided with a through hole extending in the axial direction thereof, and a check valve that communicates from the outside to the inside and blocks from the inside to the outside is fitted in the through hole. The design of the check valve facilitates filling of the damping medium into the cylinder 3410 while preventing leakage of the damping medium. It should be noted that the damping medium may also be damping oil, and when the damping oil is selected as the damping medium, the area of the damping hole 3423 is larger, which is 2-8%, preferably 5%, of the area of the piston.

The exhaust device 3430, as shown in fig. 7 and 8, includes an exhaust chamber 3431, an exhaust valve seat 3432, an exhaust valve spool 3433, a 1 st return spring 3434, and an end cap 3435. The discharge chamber 3431 is provided in the side wall of the cylinder barrel 3411, extends in the radial direction of the cylinder barrel 3411, i.e., in the horizontal direction shown in fig. 8, and is a chamber which is open at the outer end and is surrounded by the bottom wall and the side wall. An exhaust valve seat 3432 is provided at the bottom wall of the exhaust lumen 3431, and the exhaust valve seat 3432 is coaxially aligned with the exhaust lumen 3431. The center of the drain valve seat 3432 is provided with a radially disposed contact rod orifice. The drain spool 3433 includes a spool portion 34331 and a bank bar 34332, and the surface of the end of the bank bar 34332 is a smooth arc. The spool portion 34331 sealingly engages the drain valve seat 3432. Alternatively, the discharge lumen 3431, the discharge valve seat 3432, and the rod aperture may be coaxially aligned and have a circular cross-section, and the diameter of the rod aperture is smaller than the diameter of the discharge lumen 3431. The spool portion 34331 and the drain rod 34332 coaxially mate to mate with the drain valve seat 3432 and the drain chamber 3431. The above-mentioned drain valve element 3433 is housed in the drain chamber 3431, and the drain rod 34332 of the drain valve element 3433 protrudes from the inner wall surface of the cylinder 3410, and the height mark H of the drain rod 34332 protruding from the inner wall surface of the cylinder 3410₀It is understood that the contact rod 34332 of the discharge spool 3433 protrudes from the inner wall surface of the cylinder 3410 and extends into the rod chamber; the spool portion 34331 of the drain spool 3433 sealingly engages the drain valve seat 3432. The part of the touch bar 34332 protruding from the inner wall surface of the cylinder 3410 has an outer surfaceA smooth curved surface is formed to allow the sidewall of the piston 3421 to press against the end of the smooth curved surface to move the exhaust spool 3433 away from the exhaust valve seat 3432 to trigger the exhaust device 3430 to exhaust. Then, the 1 st return spring 3434 is installed into the drainage chamber 3431, and the end cap 3435 and the outer end opening of the drainage chamber 3431 are fixed in a sealing manner, and the end cap 3435 is located on the outer side of the cylinder 3411. Namely, the above-mentioned exhaust spool 3433, the 1 st return spring 3434, and the head 3435 are sequentially assembled to the exhaust chamber 3431. The exhaust valve seat 3432, the exhaust valve spool 3433, the 1 st return spring, and the head 3435 are sequentially engaged with each other, the 1 st return spring is in a compressed state, the exhaust valve seat 3432 is in sealing engagement with the exhaust valve spool 3433, i.e., the exhaust device 3430 is in a blocked state. The upper end of the 1 st exhaust conduit 3451 communicates with the exhaust chamber 3431. To facilitate the flow of damping medium when the drainage device 3430 is activated to drain, the outer side of the drainage valve core 3433 is provided with drainage grooves extending in the axial direction thereof.

As shown in fig. 7 and 8, the check device 3440 includes a check cavity 3441, a check valve seat 3442, a check valve core 3443, a 2 nd return spring 3444 and an end cap 3445. The reverse blocking chamber 3441 is provided in the side wall of the cylinder 3411 at the lower end of the cylinder 3411, extends in the axial direction of the cylinder 3411, and is a chamber surrounded by the top wall and the side wall and having an open lower end, as shown in fig. 8. The top wall of the check chamber 3441 is provided with a check valve seat 3442. A valve seat hole 3446 is provided in the middle of the check valve seat 3442, and the valve seat hole 3446 extends upward from the top wall of the check chamber 3441 and is adapted to communicate with the check chamber 3441. For the convenience of machining, the check cavity 3441, the check valve seat 3442 and the valve seat hole 3446 are coaxially matched, the cross section of the check cavity 3441 is circular, and the diameter of the check cavity 3441 is larger than that of the valve seat hole 3446. Check valve spool 3443 is in sealing engagement with check valve seat 3442. The check valve core 3443 and the 2 nd return spring 3444 are sequentially assembled in the check chamber 3441, the end cap 3445 is fixed to the lower end opening of the check chamber 3441 and is in sealing fit, the 2 nd return spring 3444 is in a compressed state, the check valve core 3443 is sealed with the check valve seat 3442, and the check device 3440 is in a flow blocking state. The lower end portion of the 1 st drain port 3451 communicates with the upper end portion of the valve seat hole 3446. To facilitate the flow of the damping medium, the outer side surface of the check valve body 3443 is provided with a drain groove extending in the axial direction thereof. The reverse blocking device 3440 is suitable for controlling the damping medium to only flow out from the rod cavity to the rodless cavity through the flow discharging device 3430, and is beneficial to the bulletproof device to absorb the energy of reverse bounce after the moving contact of the circuit breaker is switched on, and further inhibit the moving contact of the circuit breaker from generating switch-on bounce and arcing.

Therefore, the drainage cavity 3431, the discharge port 3451 of the 1 st fluid, the valve seat hole 3446, the check cavity 3441 and the drainage port 3452 of the 2 nd fluid are sequentially communicated to form a flow path for the damping medium in the rod cavity to flow into the rodless cavity through the drainage cavity 3431, the drainage port 3450 and the check cavity 3441, the check device 3440 enables the damping medium to only flow out from the rod cavity to the rodless cavity through the drainage device 3430, and the damping medium in the rodless cavity can only be discharged into the rod cavity through the damping hole 3423 on the piston 3421 to generate a damping force, so as to further suppress the bounce generated after the movable contact of the circuit breaker is closed.

When the power distribution cabinet is switched on, the electromagnetic driver 330 drives the piston of the bulletproof device to move towards the direction of the rod cavity, and damping media in the rod cavity flow into the rodless cavity through the damping hole on the piston to generate damping force, so that partial energy of a moving contact of the circuit breaker before switching on is absorbed, and the instantaneous switching-on speed of the moving contact is reduced, so that the moving contact of the circuit breaker is inhibited from generating switching-on bounce; when the piston of the bulletproof device moves at the end of the stroke, the side wall of the piston presses the discharge valve core to extend into the end part of the cylinder 3410 which is in a smooth arc surface, the discharge valve core 3433 moves in the direction far away from the discharge valve seat 3432, the discharge device 3430 is triggered to discharge, the damping medium in the rod cavity flows into the 1 st discharge pore 3451 through the discharge device 3430, the damping medium flowing into the 1 st discharge pore 3451 presses the check valve core 3443 of the check device 3440, the check valve core 3443 moves in the direction far away from the check valve seat 3442, the check device 3440 is triggered to discharge, the damping medium in the rod cavity flows into the rodless cavity through the discharge device 3430, the discharge pore 3450 and the check device 3440, the energy stored at the tail end of the stroke of the bulletproof device 100 is released, the driving force of the bulletproof device driving the movable contact breaker to bounce after closing is eliminated, and the movable contact breaker is further inhibited from generating closing; after the circuit breaker is switched on, when a moving contact of the circuit breaker generates reverse bounce, the piston of the bulletproof device is driven to move towards the direction of the rodless cavity, the drainage valve core 3433 and the side wall of the piston 3421 interact with each other, and the flowing cannot be reset immediately to block the flowing, and under the action of the 2 nd reset spring 3444, the check device 3440 is reset immediately to block the flowing, so that damping media in the rodless cavity are prevented from flowing towards the rod cavity through the drainage device 3430, the damping media in the rodless cavity only can flow into the rod cavity through the damping holes 3423 in the piston 3421, damping force is generated, the energy of the reverse bounce after the moving contact is absorbed, and the moving contact is further inhibited from generating the reverse bounce. By adopting the three technical means, the breaker moving contact is inhibited from generating switching-on bounce, so that the switching-on bounce arcing of the breaker moving contact is effectively avoided, the explosion caused by the arcing of the breaker is avoided, and the switching-on performance and the safety of the power distribution cabinet are improved.

In order to further suppress the switch-on bounce arcing of the power distribution cabinet, the insulating cylinder 320 is further technically improved, and the main difference from the insulating cylinder of the above embodiment is that: the insulating cylinder 320 houses a damper. As shown in fig. 5, the damper includes an insulating cylinder 322, an insulating cylinder piston 232, an insulating cylinder spring 324, and an insulating cylinder end cover 325. The insulating cylinder block 322 is a cylindrical cavity with an open upper end surrounded by a bottom wall and a side wall, as shown in fig. 5. The insulator 321 is provided inside with a cylindrical cavity extending along its axis and having an upper end opened, and the cylindrical cavity is fitted into the insulating cylinder block 322. The insulation cylinder body 322 is fitted into the cylindrical cavity of the insulator 321 and fixed thereto, the upper end opening of the insulation cylinder body 322 is located below the upper end opening of the insulator 321, and the insulation cylinder body 322 is coaxially fitted with the insulator 321. The insulation cylinder 320 comprises an umbrella skirt, an insulator 321 and an insulation cylinder body 322 of the damper from outside to inside in sequence. The insulation cylinder piston 232 is provided with an overflow hole, and the area of the overflow hole is 2-8%, such as 6%, of the area of the insulation cylinder piston 232. The lower end of the upper shaft 326 extends through a through hole in the middle of the end cap 325 of the insulating cylinder, and is fixed and sealingly engaged with a through hole in the middle of the piston 232 of the insulating cylinder. The insulating cylinder spring 324 is placed in the insulating cylinder body 322 and matched with the insulating cylinder body coaxially; the insulation cylinder piston 232 is slid into the insulation cylinder 322, and the insulation cylinder end cap 325 covers the upper end opening of the insulation cylinder 322, and is fixed and sealed, so that the upper end of the upper shaft rod 326 is located above the insulator 321. The upper shaft 326 is in sealing engagement with a through hole in the middle of the end cap 325 of the insulating cylinder, and a seal can be used to achieve sealing. The insulating cylinder spring 324 is located between the bottom of the insulating cylinder 322 and the insulating cylinder piston 232, and alternatively, the height of the insulating cylinder spring 324 is 1/2-3/4 of the height of the insulating cylinder 322, the stroke of the insulating cylinder piston 232 is greater than that of the movable contact 312, after opening, the insulating cylinder spring 324 is in a natural extension state, and after closing, the insulating cylinder spring 324 is in a compressed state. The insulating cylinder body 322 of the damper is filled with damping oil, and the filling amount of the damping oil accounts for 70-95% of the volume of the insulating cylinder body 322. The insulating cylinder spring can absorb the energy of the reverse bounce of the moving contact of the power distribution cabinet so as to further restrain the closing bounce of the moving contact.

Compared with the above embodiment, this embodiment achieves further technical effects: when the switch board closes a floodgate, insulating cylinder piston 232 of attenuator moves to the bottom direction of insulating cylinder body 322, and damping oil and insulating cylinder spring are compressed by the acting, absorb the energy of moving contact, reduce moving contact combined floodgate instantaneous speed, and the attenuator storage high energy in the combined floodgate moment can effectively restrain the moving contact and take place reverse spring after closing a floodgate, further ensures that the moving contact does not take place combined floodgate spring arcing again, improves the combined floodgate performance of switch board.

Further, when the filling amount of the damping oil accounts for 81-85% of the volume of the insulating cylinder 322, the height of the insulating cylinder spring 324 is 2/3% of the height of the insulating cylinder 322, and the area of the overflow hole accounts for 3.8-4.3% of the area of the insulating cylinder piston 232, the effect of the damper on inhibiting the moving contact from generating the closing bounce is better, the generation rate of the closing bounce arcing can be reduced to less than 0.2% from about 4% in the prior art, namely the closing arcing is basically eliminated.

The power distribution cabinet comprises a closed cabinet body, a condensation removing chamber, a circulating pump and a condensation removing device. The interior of the cabinet is divided by a metal partition into a bus compartment, a cable compartment, a circuit breaker compartment and a control compartment. The circuit breaker compartment, the bus compartment, the cable compartment and the condensation removing chamber are sequentially communicated, an input port of the circulating pump is communicated with an output port of the condensation removing chamber, an output port of the circulating pump is communicated with an input port of the circuit breaker compartment, and a circulating flow path for gas flowing in the power distribution cabinet is formed. The condensation removing device consists of a compressor, a condenser, a storage tank, a throttle valve and an evaporator which are sequentially communicated. The storage tank is filled with refrigerant medium. The evaporator is assembled in the condensation removing chamber, the evaporator is communicated with the throttle valve through a 1 st pipeline, and the evaporator is communicated with the compressor through a 2 nd pipeline to form a circulating flow path suitable for flowing of refrigerant media. The 1 st pipeline and the 2 nd pipeline respectively penetrate through the side wall of the condensation removing chamber and are in sealing fit with each other. The compressor is operated and started to drive the refrigerant medium to flow, the heat in the condensation removing chamber is carried out, and the condensation removing chamber is cooled. The circulating pump is controlled and is started, the gas flow in the drive switch board, the gas that flows into except that the condensation room is cooled down, the dissolved quantity of water reduces in the gas, gas and evaporimeter surface action, produce the condensate water on the evaporimeter surface, then the moisture that flows through in removing the condensation room gas is got rid of, form drier gas, this drier gas is sent into in the switch board by the circulating pump, realize reducing the water content of gas in the switch board, keep dry environment in the switch board, avoid the interior component surface of switch board to form water film and condensation, the favourable increase is electric insulation creepage distance, avoid taking place the flashover discharge, cause switch board fault tripping operation such as interphase short circuit and ground connection short circuit, make the switch board operate steadily and safely in humid environment, furthermore, can also reduce the inside temperature of switch board.

Compared with the prior art, the invention has the beneficial technical effects that:

through configuration circulating pump and removing the condensation device, get rid of the water content of gas in the switch board, make and keep dry environment in the switch board, avoid the interior component surface of switch board to form water film and condensation, favourable increase electric insulation creepage distance avoids taking place flashover discharge, alternate short circuit and ground connection short circuit etc. and arouses switch board trouble tripping operation, ensures that the switch board operates steadily safely in humid environment.

The foregoing shows and describes the general principles, essential features, and advantages of the invention.

Claims (10)

1. A power distribution cabinet suitable for preventing condensation comprises a cabinet body (100), wherein the cabinet body (100) is in a closed state; the cabinet body (100) is divided into a bus compartment (10) positioned at the rear side, a cable compartment (20), a breaker compartment (30) positioned at the front side and a control compartment (40) by a metal partition plate; the bus compartment (10) is located above the cable compartment (20); the circuit breaker compartment (30) is arranged in the middle of the cabinet body (100), and the control compartment (40) is positioned above the circuit breaker compartment (30); the method is characterized in that: also comprises a condensation removing chamber (60), a circulating pump (70) and a condensation removing device (80) suitable for removing condensation; the circuit breaker compartment (30), the bus compartment (10), the cable compartment (20) and the condensation removing chamber (60) are sequentially communicated, an input port of the circulating pump (70) is communicated with an output port of the condensation removing chamber (60), an output port of the circulating pump (70) is communicated with an input port of the circuit breaker compartment (30), and the circulating pump is suitable for driving gas in the cabinet body to circularly flow; the condensation removing device (80) at least comprises a compressor (81), a condenser (82), an evaporator (83), a throttle valve (84) and a storage tank (85), wherein the evaporator (83) is assembled in the condensation removing chamber (60) and divides the condensation removing chamber (60) into a wet chamber positioned on the input side and a dry chamber positioned on the output side, and the condensation removing device is suitable for removing moisture in gas flowing through the condensation removing chamber; a storage tank (85) adapted to store a refrigerant medium; the output port of the compressor (81), the condenser (82), the storage tank (85) and the input ports of the throttle valve (84) are sequentially communicated, the output port of the throttle valve (84) is communicated with the input port of the evaporator (83) through a 1 st pipeline, and the output port of the evaporator (83) is communicated with the input port of the compressor (81) through a 2 nd pipeline to form a flow path suitable for the circulation flow of a refrigerant medium to remove condensation; the 1 st pipeline and the 2 nd pipeline respectively penetrate through the side wall of the condensation removing chamber (60) and are in sealing fit with the side wall of the condensation removing chamber (60).

2. The condensation-proof power distribution cabinet according to claim 1, characterized in that: a 1 st input port (101) suitable for gas to flow in is arranged on the metal partition plate at the bottom of the breaker compartment (30); a 2 nd circulation port (102) suitable for gas circulation is arranged on a metal partition board which is arranged in an upright way and is used for the adjacent and common use of the breaker compartment (30) and the bus compartment (10), and is positioned at the top end part of the metal partition board; a 3 rd circulating port (103) suitable for gas circulation is arranged on a horizontally arranged metal partition board which is used for the bus compartment (10) and the cable compartment (20) in a neighboring and shared mode; a 4 th output port (104) suitable for gas outflow is arranged on the metal partition plate on one side of the bus compartment (10) and is positioned at the bottom end part; the input port of the condensation removing chamber (60) is communicated with the 4 th output port (104) of the cable compartment (20), and the output port of the circulating pump (70) is communicated with the 1 st input port (101) of the breaker compartment (30).

3. The condensation-proof power distribution cabinet according to claim 2, characterized in that: the 1 st input port (101), the 2 nd circulation port (102), the 3 rd circulation port (103) and the 4 th output port (104) are identical in structure and comprise a plurality of slits arranged on the metal partition plate.

4. The condensation-proof power distribution cabinet according to claim 3, characterized in that: the space of the cabinet body (100) below the circuit breaker compartment (30) is provided with a power chamber (50), a condensation removing chamber (60) is assembled in the power chamber (50), and the 4 th output port (104) is arranged on a metal partition board which is used for the condensation removing chamber (60) and the cable compartment (20) in an adjacent and common mode; the circulating pump (70) is assembled above the condensation removing chamber (60) and is fixed with the cabinet body (100); an input port of the circulating pump (70) is communicated with an output port positioned above the condensation removing chamber (60) through a pipeline, and an output port of the circulating pump (70) is communicated with a No. 1 input port (101) through a pipeline; the compressor (81), the condenser (82), the throttle valve (84) and the storage tank (85) are assembled in the power chamber (50), the condenser (82) is located on the right side of the power chamber (50), and the fan is arranged on the inner side of the condenser (82) and is suitable for enhancing the heat dissipation of the condenser (82).

5. The condensation-proof power distribution cabinet according to claim 4, characterized in that: the 1 st input port (101) is arranged below the circuit breaker (32), the area of the 1 st input port (101) is larger than 50% of the orthographic projection area of the circuit breaker (32) when in a working position, the 1 st input port is at least composed of a plurality of slits arranged on a metal partition plate at the bottom of a circuit breaker compartment (30) and an annular flange part fixed below the metal partition plate and surrounding the plurality of slits, an output port of the circulating pump (70) is communicated with a small diameter port of the reducer pipe in a sealing mode, and the large diameter port of the reducer pipe is matched and fixed with the flange part of the 1 st input port (101) in a sealing mode.

6. The condensation-proof power distribution cabinet according to claim 5, characterized in that: the power distribution cabinet also comprises a humidity sensor suitable for detecting the humidity of the air in the cabinet body (100) and a temperature sensor for detecting the temperature in the cabinet body; the circulating pump (70), the compressor (81), the humidity sensor and the temperature sensor are respectively and electrically connected with a controller (41) of the power distribution cabinet; the controller (41) is also internally provided with a corresponding relation between humidity and temperature; the controller (41) acquires a humidity detection value and a temperature detection value of the interior of the cabinet body detected by the humidity sensor and the temperature sensor, calculates and acquires a humidity calculation value corresponding to the temperature detection value based on the corresponding relation between the temperature detection value and the humidity and the temperature, calculates and acquires a relative error between the humidity calculation value and the humidity detection value, and when the relative error is smaller than a preset condensation removing threshold value, the controller (41) generates a control signal to operate the circulating pump (70) and the compressor (81) to start to perform the condensation removing operation until the relative error is larger than the preset condensation removing threshold value.

7. The condensation-proof power distribution cabinet according to claim 6, characterized in that:

the relative error between the humidity calculation value and the humidity detection value refers to the quotient of the difference between the humidity calculation value and the humidity detection value and the humidity calculation value.

8. Power distribution cabinet adapted to prevent condensation according to any of the claims from 1 to 7, characterized in that: the breaker compartment (30) is internally provided with a breaker (32), and the breaker (32) at least comprises a vacuum bulb (310), an insulating cylinder (320), an electromagnetic driver (330) and an bulletproof device (340) which are sequentially connected in the axial direction; the bulletproof device (340) comprises a closed cylinder body (3410), a piston (3421), a piston rod (3422), a drainage device (3430), a check device (3440) and a drainage channel (3450); one end of the piston rod (3422) penetrates through the 1 st end cap (3412) of the cylinder body (3410) and is fixed in a sealing way with a piston (3421) arranged in the cylinder body (3410), and the piston (3421) divides the inner space of the cylinder body (3410) into a rod cavity and a rodless cavity; the drainage device (3430) is arranged in the side wall of a cylinder (3411) of the cylinder (3410) and comprises a drainage valve core (3433), a contact and drainage rod (34332) of the drainage valve core (3433) penetrates through the side wall of the cylinder (3411) and extends into a rod cavity, the surface of the contact and drainage rod (34332) extending into the inner end part of the rod cavity is a smooth cambered surface, and the side wall of the piston (3421) is suitable for pressing the contact and drainage rod (34332) to trigger drainage of the drainage device (3430); the reverse blocking device (3440) is arranged in the side wall of the cylinder (3411) and is positioned at the lower end part of the cylinder (3411); a 1 st drainage port (3451) is arranged in the side wall of the cylinder (3411) and is used for communicating the drainage device (3430) with the check device (3440), and the check device (3440) is communicated with the rodless cavity through a 2 nd drainage port (3452); the reverse blocking device (3440) prevents damping media in the rodless cavity from draining to the rod cavity through the drainage device (3430), and is suitable for inhibiting the reverse bounce generated after the moving contact of the vacuum bubble (310) is switched on.

9. The condensation-proof power distribution cabinet according to claim 8, characterized in that: the drainage device (3430) comprises a drainage cavity (3431), a drainage valve seat (3432), a drainage valve core (3433), a 1 st return spring (3434) and an end cover (3435); the discharge cavity (3431) is a cavity body which is arranged in the side wall of the cylinder barrel (3411) and is opened at the outer end part enclosed by the inner end wall and the side wall, and extends along the radial direction of the cylinder barrel (3411); the drainage valve seat (3432) is arranged on the inner end wall of the drainage cavity (3431), and the middle of the drainage valve seat (3432) is provided with a contact rod hole which is arranged along the radial direction; the drain valve core (3433) comprises a valve core part (34331) and a contact bar (34332); the drainage valve core (3433) and the 1 st reset spring (3434) are sequentially assembled in the drainage cavity (3431), the touch rod (34332) penetrates through the touch rod hole to protrude out of the inner wall surface of the cylinder barrel (3411), the touch rod extends into the rod cavity, and the outer surface of the end part extending into the rod cavity is a smooth cambered surface; the end cover (3435) and the outer end opening of the drainage cavity (3431) are fixed in a sealing way, the 1 st return spring (3434) is in a compressed state, and the valve core part (34331) is in sealing fit with the drainage valve seat (3432); the discharge chamber (3431) communicates with one end of the 1 st discharge passage (3451).

10. The condensation-proof power distribution cabinet according to claim 9, characterized in that: the check device (3440) comprises a check cavity (3441), a check valve seat (3442), a check valve core (3443), a 2 nd return spring (3444) and an end plug (3445); the reverse blocking cavity (3441) is a cavity which is arranged in the side wall of the lower end part of the cylinder barrel (3411) and is enclosed by the top end and the side wall, and the lower end part of the cavity is open, and the cavity extends along the axial direction of the cylinder barrel (3411); a check valve seat (3442) is arranged at the top end of the check cavity (3441), and a valve seat hole (3446) which is communicated with the check cavity (3441) and extends upwards is arranged in the middle of the check valve seat (3442); the check valve core (3443) and the 2 nd reset spring (3444) are sequentially assembled in the check cavity (3441), an end plug (3445) and the lower end opening of the check cavity (3441) are fixed, the 2 nd reset spring (3444) is in a compressed state, and the check valve core (3443) is in sealing fit with the check valve seat (3442); the other end of the 1 st discharge passage (3451) is communicated with the valve seat hole (3446), and the lower end of the check chamber (3441) is communicated with one end of the 2 nd discharge passage (3452).

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