CN209896566U - Intelligent small-size switchgear - Google Patents

Abstract

The utility model discloses an intelligent miniature switchgear, including monitoring system, touch arm measurement ring device, the energy-absorbing device, the insulation board subassembly, dehumidification system, be used for solving cubical switchboard explosion-proof among the prior art, the effect of dehumidification is relatively poor, earthing switch's insulation board has the potential safety hazard, and vacuum interrupter's vacuum monitoring, the current of touching the arm and the great problem of the equal degree of difficulty of temperature monitoring, realize improving explosion-proof and dehumidification effect, make equipment can miniaturize, and simple, accurate vacuum to vacuum interrupter carries out on-line monitoring, stable acquisition circuit breaker touches arm real-time supervision data, be convenient for with the purpose of temperature and current information linkage processing.

Description

Intelligent small-size switchgear

Technical Field

The utility model relates to a vacuum circuit breaker field, concretely relates to intelligent miniature switchgear.

Background

The switch cabinet (switchgear cabinet) is an electrical device, the outside line of the switch cabinet firstly enters a main control switch in the cabinet and then enters a branch control switch, and each branch circuit is arranged according to the requirement. Such as meters, automatic controls, magnetic switches of motors, various alternating current contactors, and the like, some of which are also provided with high-voltage chambers and low-voltage chamber switch cabinets, and high-voltage buses, such as power plants, and some of which are also provided with low-frequency load shedding for keeping main equipment. The main function of the switch gear is to open, close, control and protect the electric equipment in the process of generating, transmitting, distributing and converting electric energy of the power system. The components in the switch cabinet mainly comprise a circuit breaker, an isolating switch, a load switch, an operating mechanism, a mutual inductor, various protection devices and the like. The classification methods of the switch cabinets are various, for example, the switch cabinets can be divided into movable switch cabinets and fixed switch cabinets by the installation mode of the circuit breaker; or according to different cabinet body structures, the cabinet body can be divided into an open type switch cabinet, a metal closed switch cabinet and a metal closed armored switch cabinet; the high-voltage switch cabinet, the medium-voltage switch cabinet, the low-voltage switch cabinet and the like can be divided according to different voltage grades. The method is mainly suitable for various occasions such as power plants, transformer substations, petrochemical industry, metallurgical steel rolling, light industrial textile, industrial and mining enterprises, residential districts, high-rise buildings and the like.

In the long-term working process of the switch cabinet, because the internal electrical elements are very many and the internal operation space is very small, a large amount of heat generated by the electrical elements during electrification can cause the temperature in the switch cabinet to rise sharply and the air pressure to increase, and when the air pressure cannot be released in time, the switch cabinet can be exploded, so that potential safety hazards and economic loss are brought. In the prior art, the explosion-proof of the switch cabinet adopts the mode of discharging pressure outside, such as a pressure release valve, an explosion-proof membrane and the like, and when the air pressure rises faster, the structure can not release the pressure in the cabinet quickly, and still can explode.

For a switchgear cabinet with a vacuum circuit breaker inside, it is necessary to keep the inside dry. In humid air areas, the interior of the switch cabinet is easily affected with damp, which is not favorable for safe and stable operation. In contrast, the solution in the prior art is to add a heating device inside the switch cabinet to accelerate the evaporation rate of the moisture entering the interior of the switch cabinet, and then to discharge the moisture through the ventilation holes of the switch cabinet. However, the dehumidification efficiency is low, the humidity of the air in the cabinet is high, and the electrical safety is hidden.

Vacuum circuit breakers are promising power switching devices in the low-voltage and medium-voltage fields, and are switching apparatuses using vacuum as an insulating and arc-extinguishing medium. Gas molecules in vacuum are very rare, and the probability of collision between electrons and molecules is very small, so that the insulating strength of the vacuum circuit breaker is very high. Compared with other types of circuit breakers, the vacuum circuit breaker has the advantages of safety, reliability, long service life, small maintenance workload, no environmental pollution and the like. The circuit breaker body and the frame are fixed on the chassis vehicle to form a circuit breaker handcart. The handcart cabinet has good interchangeability, so that the reliability of power supply can be greatly improved. The specific working principle is as follows: after the circuit breaker handcart is pushed to a working position, the operating mechanism drives the vacuum arc extinguish chamber to switch on through the insulating pull rod and other devices, current is introduced through the upper quincuncial contact, flows through the moving contact and the fixed contact of the upper wire outlet seat, the upper contact arm and the inner cavity of the vacuum arc extinguish chamber, and is fed out to a circuit or equipment through the lower contact arm and the lower quincuncial contact.

The vacuum interrupter is the core part of the vacuum circuit breaker. In order to realize the breaking and arc extinguishing of the current, the pressure in the vacuum arc extinguishing chamber is generally not higher than 10^-2Pa. Therefore, the vacuum degree is one of the main factors determining the breaking performance of the vacuum arc-extinguishing chamber, and the reduction of the vacuum degree directly affects the breaking capacity of the vacuum circuit breaker, and in severe casesIt will cause its disconnection to fail completely. Therefore, in the field of practical application, it is urgently needed to measure and record the vacuum degree of the vacuum arc-extinguishing chamber in operation.

In practical application, the method for testing the vacuum degree of the vacuum arc-extinguishing chamber mainly comprises the following steps:

(1) power frequency withstand voltage method: for the test without disassembling the arc extinguish chamber, a power frequency voltage withstanding voltage is generally adopted in the vacuum arc extinguish chamber vacuum degree detection field of the vacuum circuit breaker, namely, two contacts of the vacuum circuit breaker are pulled to a rated opening distance, the power frequency voltage between the contacts is gradually increased to a specified value, if the voltage can be endured for 1min, the vacuum degree can be considered to be qualified, and otherwise, the vacuum degree is unqualified. Practice shows that the method for detecting the vacuum degree of the serious poor-quality vacuum arc-extinguishing chamber by adopting a power frequency voltage-withstanding method is a simple, convenient and effective method, but has no effect on the arc-extinguishing chamber in a critical state. For two or more vacuum arc-extinguishing chambers used in series, the power frequency voltage withstand method is not suitable for simultaneously checking the vacuum degrees of the series arc-extinguishing chambers. In addition, the power frequency test transformer for withstand voltage experiments is large in size, heavy, inconvenient to operate and expensive, and is not capable of being configured by each power transmission and transformation unit.

(2) And (3) an observation method: since the reduction of the vacuum degree inside the vacuum interrupter is often accompanied by a change of the arc color and oxidation of the internal parts, the vacuum interrupter of the glass envelope can be observed regularly. The surface color of parts such as a shielding cover and the like in the interior is bright in normal time, and blue arc is emitted when current is cut off; when the vacuum level is severely reduced, the internal color becomes dark, and a dark red arc is found when the current is turned off. The method is only suitable for occasional qualitative inspection of the vacuum interrupter with the glass shell.

(3) A fire red measuring method: the spark leakage detector is adopted for detection, the spark leakage detector moves along the surface of the arc extinguish chamber during detection, and different light emitting conditions exist inside the arc extinguish chamber under the action of a high-frequency electric field. And identifying the vacuum degree of the vacuum arc-extinguishing chamber according to the luminous color. The method is simple to operate, can only carry out qualitative judgment, is suitable for the glass tube vacuum arc-extinguishing chamber, and is easily influenced by human factors.

(4) Determination of getter color change: when the vacuum arc-extinguishing chamber is manufactured, a layer of getter is evaporated on the inner wall of the glass tube. The getter can adsorb residual gas in the tube to maintain high vacuum on one hand, and can indicate the vacuum degree on the other hand. The maintainer can judge the vacuum degree by naked eyes according to the color change of the getter. Likewise, this method is only suitable for occasional qualitative inspections of the vacuum interrupter chamber of the glass envelope.

(5) Magnetic control discharge method: for vacuum interrupters in the manufacturing process, the vacuum pressure is usually measured with an ionization gauge. After the arc-extinguishing chamber is manufactured, the vacuum ionization gauge provided on the arc-extinguishing chamber is removed, and then the vacuum degree in the arc-extinguishing chamber is measured by a magnetron discharge method including a cylindrical excitation coil. The magnetron discharge method is one of the better methods for measuring the vacuum degree of the finished product arc extinguish chamber, and is also the only quantitative measuring method with better repeatability at present. The principle is that the contacts of the vacuum arc-extinguishing chamber are pulled apart by a certain distance, a pulse voltage is applied between the contacts so as to generate a strong electric field between the contacts, and an axial strong magnetic field is applied between the contacts of the arc-extinguishing chamber. At the moment, electrons in the arc extinguishing chamber make spiral motion under the combined action of a strong electric field and a magnetic field, and collide and ionize with residual gas molecules in the arc extinguishing chamber, and ionized ions form ion current in the electric field. This ion current is approximately proportional to the residual gas density. Therefore, by measuring the ion current, the degree of vacuum in the arc extinguishing chamber can be known. But the magnetron discharge method cannot realize on-line monitoring.

Besides the above conventional methods, the following methods are available in the prior art for detecting the vacuum degree of the vacuum interrupter: high-frequency discharge method, high-frequency current method, coupling capacitance method, electro-optical conversion method, radiation method, and the like. However, these existing vacuum arc-extinguishing chamber vacuum degree measurement methods all require the maintenance personnel to operate during maintenance, and cannot realize automatic online monitoring. In the prior art, some try to set up pressure sensing device in vacuum interrupter, but if pressure sensing device uses wired mode transmission signal, very influence vacuum interrupter's gas tightness when the signal line passes vacuum interrupter very easily, if pressure sensing device uses wireless monitoring (non-contact) mode, there will be the inaccurate problem of measurement again.

In addition, in the working process of the circuit breaker, if the temperature of the main loop is too high, heating and oxidation can be accelerated, so that phenomena such as contact finger melting and falling, contact burning, insulating material failure and the like can be caused, and even combustion and explosion can be caused in severe cases. In the prior art, the monitoring mode of the contact arm of the circuit breaker can only be used for measuring the temperature singly, and cannot be linked with the specific current, so that the measurement result only has reference and cannot be directly analyzed by using the measurement result.

Moreover, the existing vacuum circuit breaker generally has three or more grounding contacts, two adjacent grounding contacts are separated by an insulating plate to avoid short circuit, the insulating plate is independent or fixedly connected or hinged on the inner wall of the switchgear, and the grounding position and the inner wall of the switchgear (vacuum circuit breaker) still have conduction risk.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an intelligent miniature switchgear, with solve among the prior art cubical switchboard explosion-proof, the effect of dehumidification is relatively poor, earthing switch's insulation board has the potential safety hazard, and vacuum interrupter's vacuum monitoring, the electric current of touching the arm and the great problem of the equal degree of difficulty of temperature monitoring, realize improving explosion-proof and dehumidification effect, make equipment can miniaturize, and simple, accurate vacuum to vacuum interrupter carries out on-line monitoring, stable acquisition circuit breaker touches arm real-time supervision data, be convenient for with the purpose of temperature and current information linkage processing.

The utility model discloses a following technical scheme realizes:

an intelligent small-sized switch device comprises a low-pressure chamber, a handcart chamber, a bus chamber and a cable chamber, wherein an upper contact box is arranged in the bus chamber, a circuit breaker handcart and an energy absorption device are arranged in the handcart chamber, and an integrated mutual inductor contact box and a grounding switch are arranged in the cable chamber; the circuit breaker handcart includes the last arm that touches that links to each other with last base of being qualified for the next round of competitions, touches the arm down with the base of being qualified for the next round of competitions links to each other down, on touch the arm and be used for linking to each other with last contact box, touch the arm down and be used for linking to each other with integral type mutual-inductor contact box, go out the base and be qualified for the next round of competitions down and be connected vacuum interrupter between the base:

the circuit breaker handcart also comprises a monitoring system and a contact arm measurement annular device:

the monitoring system comprises a vacuum balance cavity and an optical fiber, the vacuum balance cavity is separated from the vacuum arc extinguish chamber through a balance metal film, one end of the optical fiber is positioned in the vacuum balance cavity, the other end of the optical fiber is connected with a monitoring unit, and the monitoring unit is used for monitoring light intensity transmitted by the optical fiber;

the touch arm measuring ring device is sleeved on the upper touch arm and/or the lower touch arm and comprises an induction electric ring and a current detection ring, the induction electric ring and the current detection ring are opposite to each other, a central control system is connected between the induction electric ring and the current detection ring, and the touch arm measuring ring device further comprises a temperature sensor fixed on one side of the central control system facing to the direction of the center of the induction electric ring or the current detection ring; the central control system comprises a power supply module, a wireless communication module and a processing module; the power supply module is used for receiving electric energy generated by the induction loop and supplying power to the wireless communication module, the processing module and the temperature sensor; the input end of the processing module is connected with the current detection ring and the temperature sensor, and the output end of the processing module is connected with the wireless communication module;

the inner wall of the handcart room is also provided with an energy absorption device, the energy absorption device comprises a frame, a partition plate and foamed aluminum, the frame is fixed on the inner wall of the handcart room, the outline of the foamed aluminum is matched with the outline of the frame, the foamed aluminum is filled into the frame, and the thickness of the foamed aluminum is greater than that of the frame; the partition plate is fixed on the surface of one side of the foamed aluminum facing the interior of the handcart room;

the grounding switch is positioned in the insulating plate assembly, the insulating plate assembly comprises a back plate fixed on the side wall of the cable chamber and side plates fixed on the left side and the right side of the back plate, and the side plates are perpendicular to the back plate; the back plate and the side plate are both made of insulating materials; the side plates comprise a first straight plate section, an arc-shaped plate section and a second straight plate section which are sequentially distributed from top to bottom, and the concave surface of the arc-shaped plate section faces to the direction of the other side plate; the back plate is provided with a grounding contact mounting plate which is used for mounting a grounding contact, and the back plate further comprises a fourth groove formed in the bottom of the back plate, and the fourth groove is located right below the grounding contact mounting plate;

the dehumidifying system is positioned in the cable chamber and comprises a heating device and a dehumidifying device, a bell mouth is arranged at the bottom of the dehumidifying device, an air suction device and a condensation bin are arranged in the dehumidifying device, the air suction device is respectively communicated with the bell mouth and the condensation bin, and the air suction device is used for sucking air into the condensation bin from the bell mouth; the top of the condensation bin is provided with an exhaust port, the bottom of the condensation bin is connected with a drain pipe, the drain pipe inclines towards the outer side of the cabinet from top to bottom, and the drain pipe extends out of the switch equipment.

Vacuum monitoring operation to vacuum interrupter in the high voltage vacuum circuit breaker among the prior art is complicated, be difficult to real-time supervision, and touches the monitoring mode of arm single, the unable problem that links with electric current size of temperature measurement result, the utility model provides a monitoring system is used for monitoring vacuum interrupter's vacuum, touches arm measurement ring device and is used for monitoring the electric current and the temperature information that touch the arm:

the monitoring system comprises a vacuum balance cavity, a balance metal film is arranged between the vacuum balance cavity and the vacuum arc extinguish chamber, one end of the optical fiber is located in the vacuum balance cavity, the other end of the optical fiber is connected with the monitoring unit, and the monitoring unit is used for monitoring the light intensity transmitted by the optical fiber, so that when the vacuum degree in the vacuum arc extinguish chamber is kept stable, the balance metal film is kept still, the light intensity transmitted to the monitoring unit through the optical fiber is kept unchanged, and the vacuum degree in the vacuum arc extinguish chamber can be judged to be good. When vacuum interrupter reveals, vacuum reduces, balanced metallic film both sides pressure differential changes, and balanced metallic film produces deformation under the pressure differential effect, and it must change to the reflection of light, and the light intensity that reaches the monitoring unit through optic fibre this moment then changes, can judge that vacuum interrupter probably reveals promptly, and the monitoring unit can send out the warning suggestion staff and inspect and confirm. The monitoring system is simple in structure, realizes indirect real-time monitoring of the condition in the vacuum arc extinguish chamber by elastic deformation of the balance metal film and light intensity change, and solves the problem that the vacuum degree of the vacuum arc extinguish chamber can be checked only by workers during regular maintenance in the prior art. In addition, because optic fibre is the vacuum balance chamber that passes, can not take place any direct contact with vacuum interrupter, consequently compare in the prior art and need the mode of the inner wall trompil threading transmission signal at vacuum interrupter, avoided the interference to vacuum interrupter gas tightness to optic fibre short distance transmission light's stability is high, can guarantee very good measurement accuracy. In addition, if the light in the vacuum balance cavity is insufficient in nature, the light source can be flexibly arranged by the technical personnel in the field as required to provide stable light for the vacuum balance cavity.

The contact arm measuring ring device is sleeved on the upper contact arm and/or the lower contact arm, and the induction electric ring and the current detection ring are annular, so that the contact arm can be directly sleeved with the induction electric ring and the current detection ring. The induction electric ring is used for obtaining induction current, the current detection ring is used for monitoring the current in the contact arm of the circuit breaker in real time, the induction electric ring and the current detection ring are connected with a central control system, and the central control system plays a role in connection at first so that the induction electric ring and the current detection ring are connected into a whole. The center control system is towards the fixed temperature sensor of induction ring or current detection ring centre of a circle direction one side, it is that temperature sensor is towards the circuit breaker and touches arm place direction promptly, and including power module, wireless communication module, processing module in the center control system, power module is used for receiving the induced-current that induction ring produced and stores, these electric energy of storing are used for supplying power to wireless communication module, processing module, temperature sensor, make this application can be stable keep automatic work, need not additionally to provide power supply. The input end of the processing module is connected with the current detection ring and the temperature sensor, and the output end of the processing module is connected with the wireless communication module, so that current and temperature information monitored by the current detection ring and the temperature sensor in real time are firstly transmitted to the processing module to be processed, then transmitted to the wireless communication module and sent out by the wireless communication module. This application carries out the transmission of signal through wireless communication module, can realize real-time supervision, protection circuit breaker and switchgear's effect. This application is through touching arm measurement ring device, and it is single to have solved the monitoring mode that the circuit breaker touched the arm among the prior art, and the temperature measurement result can't with the problem of the linkage of electric current size, realized stable acquireing the circuit breaker and touched arm real-time supervision data, can be with the purpose of temperature and current information linkage processing.

In the prior art, because a large number of electrical elements are arranged in the switch cabinet, once the equipment is miniaturized, the heat release in a narrow space is extremely fast, and no matter heat or moisture can not be discharged quickly, so that the explosion risk is extremely high. And in the present application, however,

the energy absorption device is fixed in the handcart room inner wall and comprises a frame, a partition plate and foamed aluminum, wherein the frame is used for being fixed with the handcart room inner wall and providing a mounting position for the foamed aluminum. Because the profile of foaming aluminium matches with the profile of frame, consequently foaming aluminium can directly be filled in the frame, and the frame also can carry on spacingly to foaming aluminium for foaming aluminium is relatively stable. The thickness of the foamed aluminum is larger than that of the frame, namely, the part of the foamed aluminum, which is close to the center of the inner wall of the handcart room, extends out of the frame. The foamed aluminum is towards the fixed baffle of one side surface of the inside of handcart room to separate the foamed aluminum and the inside circuit breaker handcart of handcart room mutually through the baffle. The utility model discloses during normal use at ordinary times, the energy-absorbing device can not bring any interference to the indoor portion of handcart's circuit breaker handcart, climb when the indoor portion temperature of handcart, when pressure risees fast, rising atmospheric pressure is used in on the foamed aluminum, the foamed aluminum begins to warp the inside hole of extrusion gradually under lasting the pressurized, constantly consume high-temperature high-pressure gas's energy according to the law of conservation of energy, and then avoid the further rising of the indoor inner wall internal pressure of handcart, slow down the indoor inner wall inside atmospheric pressure rate that rises of handcart, provide more pressure release time for the indoor various pressure release mouths or the scavenge ports that just have of handcart before pressure reaches the limit, thereby show the indoor portion's of handcart atmospheric pressure rate that rises. In addition, when explosion cannot be avoided, explosion shock waves instantly act on the partition plate and the foamed aluminum, the foamed aluminum is instantly compressed, and due to the limitation and the blocking of the frame, the part of the foamed aluminum outside the frame can be pressed to be unfolded towards the side of the frame, and the part of the foamed aluminum is completely deformed in the process, so that the energy consumption is extremely high, and a large amount of shock wave kinetic energy can be absorbed; and the part of foamed aluminum positioned in the frame cannot be unfolded towards the side, so that the part of foamed aluminum collapses towards the inner wall of the handcart room, and energy passes through the part of foamed aluminum and then impacts the inner wall of the handcart room to be discharged outwards. Borrow mutually supporting by frame, baffle, foamed aluminum in this application, can absorb a large amount of energy in the twinkling of an eye in the explosion, adopt the mode that absorbs and arrange outward and combine together to the explosion shock wave to carry out the pressure release, show the reduction explosion scale. This application compares in prior art only through explosion-proof mode of outer row's energy such as relief valve, rupture membrane, explosion-proof ability, explosion-proof effect all have showing and promote. It should be noted that the foamed aluminum in the present application cannot be replaced by the rest of the energy-absorbing hole materials in the prior art, because only the foamed aluminum with a high strength structure can absorb a large amount of energy in the processes of being compressed, deformed and collapsed; and the prior art does not have the application of foamed aluminum in the field for energy absorption and explosion prevention.

The problem to the earthing switch insulation board in the vacuum circuit breaker among the prior art has the potential safety hazard, this application improves the insulation board, has set up special insulation board subassembly, and the backplate is used for fixing the inner wall at the cable chamber, connects the ground contact mounting panel on it for carry out erection joint with earthing switch's ground contact, wherein the connected mode between ground contact mounting panel and the ground contact use current arbitrary connected mode can, like bolted connection, joint, centre gripping etc. all can. The left side and the right side of the back plate are provided with the side plates, so that the left side and the right side of the back plate are coated with the ground contacts through the side plates on the two sides, and the adjacent ground contacts are fully isolated. Because each ground contact is located in one application, for two adjacent ground contacts, two side plates are used for blocking the two adjacent ground contacts, and compared with a traditional single-block insulation mode, the anti-fleeing and short-circuit-preventing effect is obviously better. This scheme also has double-deck isolation between ground contact and the cable chamber inner wall owing to there is the backplate and the existence of ground contact mounting panel, therefore the risk of switching on between ground contact and the circuit breaker inner wall is showing and is reducing, and ground contact's insulating security has showing and improves. Wherein, the curb plate includes from last first straight plate section, cowl section, the straight plate section of second that down distributes in proper order, the concave surface of cowl section is towards another curb plate place orientation, and consequently the cowl section on two blocks of curb plates expands to the outside respectively, and the space between two blocks of curb plates of this region obviously increases, and this kind of setting is in order to give the installation space that the ground contact of connection on the ground contact mounting panel is wider, and the workman's installation and the dismantlement operation of being convenient for, this kind of setting also can further improvement ground contact and the safe distance between the curb plate simultaneously, reduces the potential safety hazard. In addition, the bottom of the back plate is provided with the groove, the groove is positioned right below the grounding contact mounting plate, and the groove can be used for improving heat dissipation firstly, so that more heat can be dissipated and overflowed outwards in the grounding maintenance process; and earth conductor that ground contact is connected can pass through the recess card is at the circuit breaker inner wall, if set up common cable buckle isotructure at the cable chamber inner wall, and the recess of this application can make earth conductor just can reach the inner wall of cable chamber in short distance and block and establish to avoid earth conductor to stack winding problem in a mixed and disorderly manner in backplate, curb plate around the space that forms, ensure that earth conductor can lead to the cable chamber inner wall as early as possible and regular.

In addition, cubical switchboard dehumidification inefficiency among the prior art, in case with the cubical switchboard miniaturized back, inside air humidity is very big, and the security is lower, and the dehumidification system who provides for this application has included heating device and dehydrating unit, and dehydrating unit inhales moist air wherein from the horn mouth through the aspirator to carry to in the condensation storehouse. Because the air is heated by the heating device, the moisture content in the air is very high, so that the moist air can be condensed in the condensation bin, the condensed liquid water is discharged from the drain pipe at the bottom, and the air subjected to condensation and dehumidification is discharged from the exhaust port at the top and returns to the cabinet body. The water droplets are collected in the drain pipe, and are discharged to the outside of the switchgear along the drain pipe under the action of gravity. According to the switch cabinet, the dehumidifying device is combined with the heating device, the heating device is responsible for accelerating evaporation of moisture entering the cabinet body, on the basis, air rich in water vapor is quickly sucked away by the dehumidifying device and treated, and the moisture is discharged out of the cabinet body, so that compared with a traditional switch cabinet which only depends on a heating mode for dehumidification, the dehumidifying efficiency is remarkably improved; and under dehydrating unit's effect, can keep the internal air humidity of cabinet at lower level, consequently can reduce the potential safety hazard, improve the electric security of the internal portion of cabinet, be favorable to the miniaturization of cubical switchboard more. In addition, because the continuous suction of dehydrating unit and exhaust air in this application, can show the air flow rate in the aggravation cubical switchboard, be favorable to improving the evaporation efficiency of inside moisture, still be favorable to improving inside and the external efficiency of carrying out the air exchange.

The outside of the vacuum arc extinguish chamber is provided with a sensing bin, the balance metal film divides the inside of the sensing bin into a pressure transmission cavity and a vacuum balance cavity, and the pressure transmission cavity is communicated with the vacuum arc extinguish chamber. The sensing bin is preferably integrally formed with a housing of the vacuum arc-extinguishing chamber.

The monitoring unit can send out laser, and the laser is transmitted to the vacuum balance cavity through the optical fiber. The monitoring unit passes through optic fibre with the stable transmission of laser to the balanced intracavity of vacuum and then form stable light source, and this scheme is optical fiber as the passageway of transmitting light source and feedback light simultaneously, and the monitoring unit can continuous emission laser, also preferred discontinuous emission laser.

The balance metal film is an aluminum foil coated with white paint on the surface. The surface coated with the white paint can improve the surface flatness, is beneficial to the reflection of light and reduces the absorption of light.

The white paint comprises the following components in parts by weight: 45-50 parts of alkyd resin, 4-6 parts of dispersing agent, 0.2-0.5 part of defoaming agent, 10-15 parts of zinc sulfide, 10-15 parts of barium sulfate, 25-30 parts of titanium dioxide and 30-40 parts of solvent. In the formula, titanium dioxide is used as the main whitening agent, and zinc sulfide and barium sulfate are used as auxiliary whitening agents, so that the obtained paint is pure white, the absorption of light is further reduced, and more light is reflected. In addition, a large amount of titanium dioxide's in this scheme addition, titanium dioxide exists in the white paint with solid particle's form all the time, and the coating can be favorable to the aluminium foil surface to form diffuse reflection behind the aluminium foil surface, and under the diffuse reflection condition, can more stably ensure when the balanced metal film takes place deformation that the optic fibre receives the light of different intensity to avoid under the balanced metal film takes place the specular reflection condition, the little condition of illumination intensity change of optic fibre department appears around the balanced metal film deformation.

The side wall of the vacuum balance cavity is provided with a first groove, the first groove and the vacuum balance cavity are separated by a transparent piece, and a light source is arranged in the first groove. The scheme is another mode for providing a light source for the vacuum balance cavity.

Preferably, the transparent member is vacuum glass. The vacuum glass has excellent heat insulation capability, and can prevent heat emitted by the light source from entering the vacuum balance cavity.

An on-line monitoring method for the vacuum degree of a high-voltage vacuum circuit breaker comprises the following steps:

(a) an airtight vacuum balance cavity is arranged, so that the vacuum balance cavity and the vacuum arc extinguish chamber are separated by a balance metal film;

(b) monitoring the light intensity in the vacuum balance cavity: if the light intensity in the vacuum balance cavity is kept unchanged, the vacuum arc extinguish chamber is judged to be normal; and if the light intensity in the vacuum balance cavity changes, judging that the vacuum arc extinguish chamber leaks.

If the vacuum arc extinguish chamber leaks, the pressure of the vacuum balance cavity and the vacuum arc extinguish chamber is unbalanced, so that the balance metal film is deformed, the reflection light intensity of the balance metal film is different before and after the deformation, and whether the vacuum of the arc extinguish chamber leaks or not can be monitored in real time.

The light intensity in the vacuum balance cavity is monitored by an optical fiber inserted into the vacuum balance cavity. The optical fiber has the performance of resisting electromagnetic and atomic radiation interference, and has the mechanical properties of thin diameter, soft quality and light weight; the composite material has the electrical properties of insulation and no induction, and the chemical properties of water resistance, high temperature resistance, corrosion resistance and the like, and can resist the extreme conditions of the vacuum arc-extinguishing chamber.

A light source is provided to the vacuum balance cavity during monitoring. The light source is laser transmitted to the vacuum balance cavity through an optical fiber.

Furthermore, the induction electric ring and the current detection ring are coaxial and are sleeved outside the contact arm; the central control system is connected to the tops of the induction electric ring and the current detection ring, the temperature sensor is arranged on the lower surface of the central control system, and the temperature sensor is in contact with the contact arm of the circuit breaker. The induction electrical ring is coaxial with the current detection ring, so that the induction electrical ring and the current detection ring can be stably sleeved on the contact arm at the same time, the central control system is connected to the tops of the induction electrical ring and the current detection ring, the temperature sensor is arranged on the lower surface of the central control system, and the structure can ensure that the temperature sensor above the contact arm is naturally and stably contacted with the contact arm under the action of the integral gravity of the device.

The induction loop is a current transformer. The current detection ring is a Rogowski coil. The processing module is an analog-to-digital converter.

The bottom end of the induction electric ring or the current detection ring is fixed with a bearing plate, and the upper surface of the bearing plate is provided with a groove matched with the bottom of the contact arm of the circuit breaker. The bottom phase-match of recess and circuit breaker contact arm to contact the arm through the recess and provide the storage tank for the circuit breaker, make the circuit breaker contact the bottom of arm and carry out the cladding by the recess, hold by the bearing board and touch arm measurement ring device, improve and touch arm measurement ring device's job stabilization nature.

The two opposite sides of the bearing plate are hinged with the clamping plates through hinges, and the clamping plates are connected with the outer wall of the bearing plate through tension springs. When the circuit breaker touches the arm and places in the recess, the grip block of both sides is by the inboard pulling of extension spring, and then the grip block board touches the both sides of arm at the circuit breaker, touches the arm from both sides by the grip block and tightly cliies the circuit breaker to make touch the arm and measure the ring device and touch the static friction between the arm very big, provide this application and touch the relative connection stability between the arm, avoid this application to produce the slip displacement along the axial that touches the arm easily, show the stability that improves this application on-line monitoring in-process. The inner side surface of the clamping plate is provided with a plurality of convex teeth. Improve the grip block through the dogtooth and touch the frictional resistance between the arm, further guarantee the stability in use of this application.

One side surface of the foamed aluminum is attached to the inner wall of the handcart room, and the other side surface of the foamed aluminum is attached to the partition plate; the projection of the foamed aluminum on the surface of the partition board completely falls into the area where the partition board is located; and a plurality of third grooves which are parallel to each other are formed in the surface of one side of the foamed aluminum facing the inside of the cabinet body. The foamed aluminum is fully attached to the cabinet body and the inner wall, and the pressure transmission efficiency is improved. The baffle surface area is greater than the area of foaming aluminium towards handcart room inside one side, ensures that the baffle fully shelters from to foaming aluminium, makes the high pressure of cabinet body inside can be more act on foaming aluminium through the baffle is indirect simultaneously, improves the availability factor to foaming aluminium, more abundant utilization foaming aluminium's energy-absorbing effect. When explosion happens, the shock wave instantly reaches the surface of the foamed aluminum, and the foamed aluminum can be sunk and enclosed from the periphery of the third groove to the inside of the third groove. Since the third recessed groove is located on the surface of the foamed aluminum facing the inside of the hand truck compartment, that is, the portion located outside the frame, the foamed aluminum is pressed to be spread out to the side of the frame according to the above description. Therefore, in the scheme, the edge parts of the foamed aluminum are unfolded towards the sides of the frame, the central parts are gathered in the third grooves, the interior of the foamed aluminum at the moment is drawn by two opposite acting forces, the internal friction effect of the foamed aluminum is very large, the energy absorption and energy consumption effects of the foamed aluminum can be more remarkably increased through the arrangement of the third grooves, and the energy absorption and explosion prevention effects are further improved.

The separator is a galvanized steel sheet; the density of the foamed aluminum is 0.1-0.4 times of that of metal aluminum, the bending specific stiffness is 1.5 times of that of steel, the damping performance is 5-10 times of that of the metal aluminum, the sound wave frequency is 800-4000 HZ, the electromagnetic wave frequency is 2.6-18 GHz, and the porosity is 80-90%.

The foamed aluminum and the partition plate are connected by brazing or bonded by an adhesive; in the brazing connection process, a vacuum welding process or a nitrogen protection process is needed, Al-Si brazing filler metal is used as a middle layer, and heat preservation is carried out for 5-15 min at the temperature of 585-600 ℃ after welding is finished. There are many differences in physical properties between foamed aluminum and steel, making them difficult to weld. The traditional welding method has the problems of easy burnthrough and easy formation of fragile iron and lead intermetallic compounds, and a good joint is difficult to obtain; however, if friction welding, ultrasonic welding, cold pressure welding and other methods are adopted, the construction is inconvenient due to the limitation of the shapes of the welding pieces. Therefore, the Al-Si brazing filler metal is adopted as the middle layer for brazing, and the aluminum-silicon brazing filler metal has the advantages of low heating temperature, stable welding, small deformation and small welding line. The heat preservation time and the temperature after the welding can be mutually complemented, which is beneficial to obtaining a better soldered joint.

The grounding contact mounting plate is fixed on the back plate through bolts; the first straight plate section and the second straight plate section are both corrugated plates; the back plate and the side plate are integrally formed. The bolt can also extend to the lateral wall of cable chamber, and then fixes ground contact mounting panel, backplate in this application simultaneously on the cable chamber inner wall through this bolt. Preferably, the bolt can also be used to simultaneously connect the ground contacts. The corrugated plates serving as the first straight plate section and the second straight plate section can obviously increase the surface areas of the two sides of the first straight plate section and the second straight plate section, so that the heat dissipation effects of the first straight plate section and the second straight plate section are improved; secondly can also improve the ability that first straight plate section, the anti external force of second straight plate section are strikeed and are destroyed, prolong the explosion-proof life-span of this application.

The fourth groove is square, a plurality of parallel connecting rods are fixed between two opposite side walls of the fourth groove, and the connecting rods are also made of insulating materials; the connecting rods are distributed at equal intervals; a plurality of upward convex cylinders are uniformly distributed on the connecting rod along the axis direction of the connecting rod. When the length of the grounding wire is too long, the grounding wire can be wound on the connecting rod for a plurality of circles and then passes through the fourth groove, or the grounding wire can be sequentially wound around a plurality of connecting rods to realize the consumption of the length of the grounding wire, so that the problem that the grounding wire is stacked in a mess and wound is further avoided. The cylinder can carry on spacingly to passing or winding the earth conductor on the connecting rod for the stable distribution of an earth conductor avoids the horizontal slip between two adjacent cylinders, thereby further improves the stable effect to earth conductor.

A plurality of condensing metal sheets are fixed on the side wall of the condensing bin, the condensing metal sheets are divided into two rows, namely a high row and a low row, and the two rows of condensing metal sheets are arranged in a staggered manner; the bottom surface of the condensation bin is an inclined plane with two high sides and a low middle part, and the drain pipe is connected to the lowest position of the bottom surface of the condensation bin; a baffle is arranged between the dehumidifying device and the heating device, and the projection of the horn mouth on the top surface of the baffle is completely positioned in the area of the top surface of the baffle. The moist water vapor impacts on the condensing metal sheet, and the water vapor can be rapidly condensed on the surface of the condensing metal sheet. The two rows of condensing metal sheets are arranged in a staggered manner, namely, for two adjacent condensing metal sheets, one condensing metal sheet is positioned in the upper row, and the other condensing metal sheet is positioned in the lower row. The arrangement can enable the air to be in contact with more and larger-area condensing metal sheets in the process of flowing in the condensing bin, so that the dehumidification is fully performed. Besides, the condensation metal sheets which are arranged in a staggered mode can also improve the stroke length of air in the condensation bin, so that water vapor in the air is more fully condensed. The bottom surface in condensation storehouse is the inclined plane that both sides are high, the centre is low, and the comdenstion water of being convenient for assembles to centre low level under the action of gravity, and then during the inflow drain pipe, avoids piling up of comdenstion water in condensation storehouse, ensures that the comdenstion water can in time be discharged. Through the separation of baffle, avoid directly being absorbed by dehydrating unit through the air of heating device heating for the hot-air can fill the dispersion and overflow the internal portion of cabinet various heat exchanges that carry on, improves the evaporation efficiency of moisture everywhere in the cabinet.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model relates to an intelligent miniature switchgear, monitoring system's structure and operation are all extremely simple, through the elastic deformation of balanced metallic membrane, borrow the light intensity change and realize indirect real-time supervision to the interior condition of vacuum interrupter, have overcome among the prior art and all need the staff just can inspect the vacuum of vacuum interrupter, wireless real-time on-line monitoring's problem when the periodic maintenance.

2. The utility model relates to an intelligent small-size switchgear, because optic fibre is the balanced chamber of vacuum that passes, can not take place any direct contact with vacuum interrupter, consequently compare in the mode that needs the inner wall trompil threading transmission signal at vacuum interrupter among the prior art, avoided the interference to vacuum interrupter gas tightness to optic fibre short distance transmission light's stability is high, can guarantee very good measurement accuracy.

3. The utility model relates to an intelligent miniature switchgear touches arm and measures keeping automatic work that the annular device can be stable, need not additionally to provide power supply. The input end of the processing module is connected with the current detection ring and the temperature sensor, and the output end of the processing module is connected with the wireless communication module, so that current and temperature information monitored by the current detection ring and the temperature sensor in real time are firstly transmitted to the processing module to be processed, then transmitted to the wireless communication module and sent out by the wireless communication module. The wireless communication module is used for sending signals, so that the effects of monitoring and protecting the circuit breaker and the switch equipment in real time can be achieved. The contact arm measurement ring device solves the problems that in the prior art, the monitoring mode of a circuit breaker contact arm is single, and the temperature measurement result cannot be linked with the current magnitude, achieves the purpose of stably acquiring real-time monitoring data of the circuit breaker contact arm and can process the temperature and current information in a linkage manner.

4. The utility model relates to an intelligent small-size switchgear, climb as inside temperature, when pressure risees fast, rising atmospheric pressure is used in on the foamed aluminum, the foamed aluminum begins to warp the inside hole of extrusion gradually under lasting the pressurized, constantly consume the gaseous energy of high temperature high pressure according to the law of conservation of energy, and then avoid the further rising of internal pressure of cabinet, slow down the internal atmospheric pressure rate of rising of cabinet, provide more pressure release time for the various pressure release mouths or the scavenge ports that the cabinet body originally had before pressure reaches the limit, thereby show the atmospheric pressure rate of rising that reduces the internal portion of cabinet. When explosion cannot be avoided, explosion shock waves instantly act on the partition plates and the foamed aluminum, the foamed aluminum is instantly compressed, and due to the limitation and the blocking of the frame, the part, located outside the frame, of the foamed aluminum can be pressed to be unfolded towards the side of the frame; and the part of foamed aluminum positioned in the frame cannot be unfolded towards the side, so that the part of foamed aluminum collapses towards the inner wall of the handcart room, and the energy passes through the part of foamed aluminum and then impacts the side wall of the cabinet body to realize outward discharge.

5. The utility model relates to an intelligent miniature switchgear comes from left and right sides cladding ground contact through the curb plate of both sides, ensures the abundant isolation between the adjacent ground contact. Because each ground contact is located in one application, for two adjacent ground contacts, two side plates are used for blocking the two adjacent ground contacts, and compared with a traditional single-block insulation mode, the anti-fleeing and short-circuit-preventing effect is obviously better. Due to the existence of the back plate and the grounding contact mounting plate, double-layer isolation is also arranged between the grounding contact and the inner wall of the vacuum circuit breaker, so that the conduction risk between the grounding contact and the inner wall of the circuit breaker is remarkably reduced, and the insulation safety of the grounding contact is remarkably improved. The arc plate sections on the two side plates are respectively expanded towards the outer side, the space between the two side plates in the region is obviously increased, the installation and the disassembly operation of workers are facilitated, meanwhile, the safety distance between the grounding contact and the side plates can be further improved, and the potential safety hazard is reduced.

6. The utility model relates to an intelligent small-size switchgear, combine dehydrating unit and heating device, heating device is responsible for the moisture that will get into in the cabinet and evaporates with higher speed, on this basis, the air that is rich in vapor is quick is absorbed by dehydrating unit and is handled, discharges the moisture outside the cabinet body, therefore this application is compared with the traditional cubical switchboard that only relies on the heating mode dehumidification, dehumidification efficiency has showing and promotes; and under the effect of dehydrating unit, can keep cabinet body inside air humidity at lower level, consequently can reduce the potential safety hazard, improve the electric safety of cabinet body inside. In addition, because the continuous suction of dehydrating unit and exhaust air in this application can show the internal air flow rate of aggravation cabinet, be favorable to improving the evaporation efficiency of the internal portion moisture of cabinet, still be favorable to improving the internal portion of cabinet and carry out the efficiency that the air exchanged with the external world.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a cross-sectional view of a circuit breaker handcart in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a monitoring system according to an embodiment of the present invention;

FIG. 3 is a schematic view of a pressure transfer chamber according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a contact arm measurement ring device according to an embodiment of the present invention;

FIG. 5 is a side view of a contact arm measurement ring in an embodiment of the present invention;

FIG. 6 is a schematic view of the connection of the central control system of the annular measuring device for the contact arm according to the embodiment of the present invention;

FIG. 7 is a schematic structural view of a contact arm measurement ring device according to an embodiment of the present invention;

FIG. 8 is a partial schematic view of a support plate according to an embodiment of the present invention;

FIG. 9 is a schematic view of an energy absorber according to an embodiment of the present invention;

FIG. 10 is a side view of an energy absorber according to an embodiment of the present invention;

FIG. 11 is a schematic view of foamed aluminum in an embodiment of the present invention;

fig. 12 is a schematic structural view of an insulation board assembly according to an embodiment of the present invention;

fig. 13 is a schematic structural view of an insulation board assembly according to an embodiment of the present invention;

FIG. 14 is a schematic view of a dehumidification system in an embodiment of the present invention;

fig. 15 is a perspective view of a condensation chamber according to an embodiment of the present invention;

fig. 16 is an overall cross-sectional view of an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

1-a circuit breaker operating mechanism, 2-a vacuum arc extinguish chamber, 3-a sensing bin, 301-a balance metal film, 302-a vacuum balance cavity, 303-an optical fiber, 304-a pressure transmission cavity, 4-a monitoring unit, 5-a first groove, 6-a transparent part, 7-a light source, 8-a solid sealed pole, 9-an insulating pull rod, 10-a circuit breaker contact, 11-a contact arm measuring ring device, 111-a sensing electric ring, 112-a central control system, 113-a temperature sensor, 114-a current detection ring, 115-a bearing plate, 116-a second groove, 117-a clamping plate, 118-a tension spring, 12-a chassis, 13-a vehicle frame, 14-an upper wire outlet seat, 15-an upper contact arm, 16-an upper plum blossom contact and 17-a lower wire outlet seat, 18-lower contact arm, 19-lower tulip contact, 20-low-pressure chamber, 21-handcart chamber, 22-bus chamber, 23-cable chamber, 24-bus sleeve, 25-integrated mutual inductor contact box, 26-energy absorbing device, 27-grounding switch, 28-heating device, 29-intelligent dehumidifying device, 30-lightning arrester, 31-circuit breaker handcart, 32-frame, 33-clapboard, 34-foamed aluminum, 35-third groove, 36-backboard, 37-first straight plate section, 38-arc plate section, 39-second straight plate section, 40-grounding contact mounting plate, 41-fourth groove, 42-bolt, 43-connecting rod, 44-cylinder, 45-horn mouth, 46-air suction device, 47-condensation chamber, 48-exhaust port, 49-drain pipe, 50-condensation metal sheet, 51-ceramic hook, 52-baffle plate, 53-upper contact box.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Example 1:

an intelligent small-sized switchgear is shown in fig. 16 and fig. 1, and comprises a low-voltage chamber 20, a handcart chamber 21, a bus chamber 22 and a cable chamber 23, wherein an upper contact box 53 is arranged in the bus chamber 22, a circuit breaker handcart 31 and an energy absorption device 26 are arranged in the handcart chamber 21, and an integrated mutual inductor contact box 25 and a grounding switch 27 are arranged in the cable chamber 23; breaker handcart 31 includes the last arm 15 that touches that links to each other with last seat 14 of being qualified for the next round of competitions, touches arm 18 down with lower seat 17 of being qualified for the next round of competitions links to each other, on touch arm 15 and be used for linking to each other with last contact box 53, touch arm 18 down and be used for linking to each other with integral type mutual-inductor contact box 25, go up seat 14 of being qualified for the next round of competitions and be connected vacuum interrupter 2 between the seat 17 down: the circuit breaker handcart 31 still includes monitoring system, touches arm measurement ring device 11:

the monitoring system comprises a vacuum balance cavity 302 and an optical fiber 303, the vacuum balance cavity 302 is separated from the vacuum arc-extinguishing chamber 2 by a balance metal film 301, one end of the optical fiber 303 is positioned in the vacuum balance cavity 302, the other end of the optical fiber 303 is connected with a monitoring unit 4, and the monitoring unit 4 is used for monitoring light intensity transmitted by the optical fiber 303;

as shown in fig. 4 to 6, the annular contact arm measuring device 11 is sleeved on the upper contact arm 15 and the lower contact arm 18, and includes an induction electric ring 111 and a current detection ring 114, the induction electric ring 111 and the current detection ring 114 are opposite to each other, a central control system 112 is connected between the induction electric ring 111 and the current detection ring 114, and a temperature sensor 113 is fixed on one side of the central control system 112 facing the center of the induction electric ring 111 or the current detection ring 114; the central control system 112 comprises a power supply module, a wireless communication module and a processing module; the power supply module is used for receiving the electric energy generated by the induction loop 111 and supplying power to the wireless communication module, the processing module and the temperature sensor 113; the input end of the processing module is connected with the current detection ring 114 and the temperature sensor 113, and the output end of the processing module is connected with the wireless communication module;

the inner wall of the handcart room 21 is further provided with an energy absorption device 26 shown in fig. 9 to 11, the energy absorption device 26 comprises a frame 32, a partition 33 and foamed aluminum 34, the frame 32 is fixed on the inner wall of the handcart room 21, the outline of the foamed aluminum 34 is matched with the outline of the frame 32, the foamed aluminum 34 is filled in the frame 32, and the thickness of the foamed aluminum 34 is greater than that of the frame 32; the partition plate 33 is fixed on one side surface of the foamed aluminum 34 facing the interior of the handcart room 21;

preferably, as shown in fig. 16, the energy absorption device 26 is provided not only in the handcart room 21 but also in the cable room 23.

The earthing switch 27 is located in an insulating board assembly as shown in fig. 12, the insulating board assembly includes a back board 36 fixed on the side wall of the cable chamber 23, and side boards fixed on the left and right sides of the back board 36, the side boards are perpendicular to the back board 36; the back plate 36 and the side plates are made of insulating materials; the side plates comprise a first straight plate section 37, an arc-shaped plate section 38 and a second straight plate section 39 which are sequentially distributed from top to bottom, and the concave surface of the arc-shaped plate section 38 faces to the direction of the other side plate; the back plate 36 is provided with a ground contact mounting plate 40, the ground contact mounting plate 40 is used for mounting a ground contact, the back plate 36 further comprises a fourth groove 41 formed in the bottom of the back plate 36, and the fourth groove 41 is located right below the ground contact mounting plate 40;

the dehumidifying system is further included in the cable chamber 23, as shown in fig. 14 and 15, the dehumidifying system includes a heating device 28 and a dehumidifying device 29, a bell mouth 45 is arranged at the bottom of the dehumidifying device 29, an air suction device 46 and a condensation bin 47 are arranged inside the dehumidifying device 29, the air suction device 46 is respectively communicated with the bell mouth 45 and the condensation bin 47, and the air suction device 46 is used for sucking air from the bell mouth 45 to the condensation bin 47; the top of the condensation bin 47 is provided with an exhaust port 48, the bottom of the condensation bin 47 is connected with a water drainage pipe 49, the water drainage pipe 49 inclines towards the outer side of the cabinet body from top to bottom, and the water drainage pipe 49 extends out of the switch device.

In this embodiment, the sensing chamber 3 is arranged outside the vacuum interrupter 2, the balance metal film 301 divides the sensing chamber 3 into a pressure transmission chamber 304 and a vacuum balance chamber 302, and the pressure transmission chamber 304 is communicated with the vacuum interrupter 2. The monitoring unit 4 can emit laser light, and the laser light is transmitted into the vacuum balance cavity 302 through the optical fiber 303. The monitoring unit 4 is connected with an optical fiber 303, the optical fiber 303 is connected with a vacuum balance cavity 302, a balance metal film 301 is arranged in the vacuum arc-extinguishing chamber 2, and the vacuum balance cavity 302 and the vacuum arc-extinguishing chamber 2 are of an integrated structure. The monitoring unit 4 transmits laser light into the vacuum equalizing chamber 302 through the optical fiber 303, and the equalizing metal mold 301 can reflect the light. When the vacuum degree of the vacuum arc extinguish chamber 2 of the circuit breaker leaks, the pressure of the vacuum arc extinguish chamber 2 is larger than the pressure in the vacuum balance cavity 302, so that the deformation of the balance metal film 301 and the reflection change of light are caused, the optical fiber 303 transmits the light to the monitoring unit 4, and whether the vacuum arc extinguish chamber leaks in vacuum or not can be judged according to the light intensity curve.

The energy absorption device and the dehumidification system are combined to act together, and the contact arm measurement annular device 11 is matched to perform real-time monitoring, so that the miniaturization of equipment is effectively realized.

Example 2:

as shown in fig. 3, the present embodiment is different from embodiment 1 in that: the side wall of the vacuum balance cavity 302 is provided with a first groove 5, the first groove 5 and the vacuum balance cavity 302 are separated by a transparent piece 6, and a light source 7 is arranged in the first groove 5. The transparent member 6 is vacuum glass.

Preferably, the balance metal film 301 is an aluminum foil whose surface is coated with a white paint. The white paint comprises the following components in parts by weight: 45-50 parts of alkyd resin, 4-6 parts of dispersing agent, 0.2-0.5 part of defoaming agent, 10-15 parts of zinc sulfide, 10-15 parts of barium sulfate, 25-30 parts of titanium dioxide and 30-40 parts of solvent.

Example 3:

as shown in fig. 7 and 8, in the contact arm measuring ring device for a vacuum circuit breaker, on the basis of embodiment 1, the inductive electric ring 111 is coaxial with the current detection ring 114, and both are sleeved outside the upper contact arm 15 and the lower contact arm 18; the central control system 112 is connected to the top of the induction electric ring 111 and the current detection ring 114, the temperature sensor 113 is arranged on the lower surface of the central control system 112, and the temperature sensor 113 is in contact with the upper contact arm 15 and the lower contact arm 18. The bottom end of the induction ring 111 or the current detection ring 114 is fixed with a bearing plate 115, and the upper surface of the bearing plate 115 is provided with a second groove 116 matched with the bottoms of the upper contact arm 15 and the lower contact arm 18. The two opposite sides of the bearing plate 115 are hinged with a clamping plate 117 through hinges, and the clamping plate 117 is connected with the outer wall of the bearing plate 115 through a tension spring 118; the inner side surface of the clamping plate 117 is provided with a plurality of convex teeth.

Wherein, the inductive loop 111 is a current transformer; the current detection loop 114 is a rogowski coil; the processing module is an analog-to-digital converter.

Example 4:

on the basis of the embodiment 1, one side surface of the foamed aluminum 34 is attached to the inner wall of the handcart room 21, and the other side surface is attached to the partition 33; the projection of the foamed aluminum 34 on the surface of the partition 33 falls completely into the area where the partition 33 is located. The separator 33 is a galvanized steel sheet. The foamed aluminum 34 and the partition 33 are connected by brazing or by bonding with an adhesive. In the brazing connection process, a vacuum welding process or a nitrogen protection process is needed, Al-Si brazing filler metal is used as a middle layer, and heat preservation is carried out for 5-15 min at the temperature of 585-600 ℃ after welding is finished. In the embodiment, the frame 32 is fixedly connected with the inner wall of the handcart room 21 through bolts.

The properties of the foamed aluminum used in this example were as follows:

and (3) light weight: the density is 0.1-0.4 times of that of the metal aluminum;

high specific stiffness: the bending specific rigidity is 1.5 times of that of steel;

high damping shock absorption performance and impact energy absorption rate: the damping performance is 5-10 times of that of metal aluminum. The porosity is 84%, and when 50% of deformation occurs, the material can absorb energy of more than 2.5MJ/cm 3.

Good acoustic function: when the sound wave frequency is 800-4000 HZ, the sound insulation coefficient of the closed-cell foamed aluminum is more than 0.9.

Excellent electromagnetic shielding performance: when the frequency of the electromagnetic wave is between 2.6 and 18GHZ, the electromagnetic shielding capacity of the foamed aluminum can reach 60 to 90 dB.

Good thermal properties: the closed-cell foamed aluminum with the porosity of 80-90% has a heat conductivity coefficient of 0.3-1W/m.K.

Preferably, as shown in fig. 11, a plurality of third grooves 35 parallel to each other are provided on a side surface of the foamed aluminum 34 facing the inside of the handcart room 21.

As a further embodiment of the present application, the partition 33 may extend to cover the inner wall of the handcart room 21.

Example 5:

on the basis of embodiment 1, as shown in fig. 13, the ground contact mounting plate 40 is fixed to the back plate 36 by bolts 42; the first straight plate section 37 and the second straight plate section 39 are both corrugated plates; the back plate 36 and the side plates are integrally formed. The fourth groove 41 is square, a plurality of parallel connecting rods 43 are fixed between two opposite side walls of the fourth groove 41, and the connecting rods 43 are also made of insulating materials; the connecting rods 43 are distributed at equal intervals; a plurality of upward convex columns 44 are uniformly distributed on the connecting rod 43 along the axial direction of the connecting rod.

Example 6:

on the basis of embodiment 1, a plurality of condensing metal sheets 50 are fixed on the side wall of the condensing bin 47, the condensing metal sheets 50 are divided into two rows, namely a high row and a low row, and the two rows of condensing metal sheets 50 are arranged in a staggered manner; the bottom surface of the condensation bin 47 is an inclined plane with two high sides and a low middle part, and the drain pipe 49 is connected to the lowest position of the bottom surface of the condensation bin 47; a baffle plate 52 is arranged between the dehumidifying device 29 and the heating device 28, and the projection of the bell mouth 45 on the top surface of the baffle plate 52 is completely positioned in the area of the top surface of the baffle plate 52.

Preferably, the air suction device is a fan. The heating device is a heating resistance wire. Two ceramic hooks 51 with the same height are arranged on the side wall of the cable chamber, and the heating resistance wire is hung on the two ceramic hooks 51. The dehumidifying means 29 is located above the heating means 28.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. An intelligent small-sized switch device comprises a low-voltage chamber (20), a handcart chamber (21), a bus chamber (22) and a cable chamber (23), wherein an upper contact box (53) is arranged in the bus chamber (22), a circuit breaker handcart (31) and an energy absorption device (26) are arranged in the handcart chamber (21), and an integrated mutual inductor contact box (25) and a grounding switch (27) are arranged in the cable chamber (23); breaker handcart (31) include and go out on that line seat (14) link to each other and touch arm (15), touch arm (18) down with that line seat (17) link to each other down, on touch arm (15) and be used for linking to each other with last contact box (53), touch arm (18) down and be used for linking to each other with integral type mutual-inductor contact box (25), go out line seat (14) and go out and be connected vacuum interrupter (2), its characterized in that between line seat (17) down:

the circuit breaker handcart (31) further comprises a monitoring system and a contact arm measuring annular device (11):

the monitoring system comprises a vacuum balance cavity (302) and an optical fiber (303), the vacuum balance cavity (302) is separated from the vacuum arc-extinguishing chamber (2) through a balance metal film (301), one end of the optical fiber (303) is located in the vacuum balance cavity (302), the other end of the optical fiber is connected with a monitoring unit (4), and the monitoring unit (4) is used for monitoring light intensity transmitted by the optical fiber (303);

the contact arm measuring ring device (11) is sleeved on the upper contact arm (15) and/or the lower contact arm (18) and comprises an induction electric ring (111) and a current detection ring (114), the induction electric ring (111) and the current detection ring (114) are opposite to each other, a central control system (112) is connected between the induction electric ring (111) and the current detection ring (114), and the contact arm measuring ring device further comprises a temperature sensor (113) fixed on one side of the central control system (112) facing the direction of the circle center of the induction electric ring (111) or the current detection ring (114); the central control system (112) comprises a power supply module, a wireless communication module and a processing module; the power supply module is used for receiving electric energy generated by the induction electric ring (111) and supplying power to the wireless communication module, the processing module and the temperature sensor (113); the input end of the processing module is connected with the current detection ring (114) and the temperature sensor (113), and the output end of the processing module is connected with the wireless communication module;

the inner wall of the handcart room (21) is further provided with an energy absorption device (26), the energy absorption device (26) comprises a frame (32), a partition plate (33) and foamed aluminum (34), the frame (32) is fixed on the inner wall of the handcart room (21), the outline of the foamed aluminum (34) is matched with the outline of the frame (32), the foamed aluminum (34) is filled into the frame (32), and the thickness of the foamed aluminum (34) is larger than that of the frame (32); the partition plate (33) is fixed on one side surface of the foamed aluminum (34) facing the interior of the handcart room (21);

the grounding switch (27) is positioned in an insulating plate assembly, the insulating plate assembly comprises a back plate (36) fixed on the side wall of the cable chamber (23) and side plates fixed on the left side and the right side of the back plate (36), and the side plates are perpendicular to the back plate (36); the back plate (36) and the side plates are both made of insulating materials; the side plates comprise a first straight plate section (37), an arc-shaped plate section (38) and a second straight plate section (39) which are sequentially distributed from top to bottom, and the concave surface of the arc-shaped plate section (38) faces to the direction of the other side plate; the back plate (36) is provided with a grounding contact mounting plate (40), the grounding contact mounting plate (40) is used for mounting a grounding contact, the grounding contact device further comprises a fourth groove (41) formed in the bottom of the back plate (36), and the fourth groove (41) is located right below the grounding contact mounting plate (40);

the dehumidifying system is positioned in the cable chamber (23), and comprises a heating device (28) and a dehumidifying device (29), wherein a bell mouth (45) is arranged at the bottom of the dehumidifying device (29), an air suction device (46) and a condensation bin (47) are arranged in the dehumidifying device (29), the air suction device (46) is respectively communicated with the bell mouth (45) and the condensation bin (47), and the air suction device (46) is used for sucking air into the condensation bin (47) from the bell mouth (45); the top of the condensation bin (47) is provided with an exhaust port (48), the bottom of the condensation bin (47) is connected with a drain pipe (49), the drain pipe (49) inclines towards the outer side of the cabinet body from top to bottom, and the drain pipe (49) extends out of the switch device.

2. An intelligent small-sized switch equipment according to claim 1, characterized in that a sensing chamber (3) is arranged outside the vacuum arc-extinguishing chamber (2), the balance metal film (301) divides the inside of the sensing chamber (3) into a pressure-transmitting chamber (304) and a vacuum balance chamber (302), and the pressure-transmitting chamber (304) is communicated with the vacuum arc-extinguishing chamber (2); the monitoring unit (4) can emit laser, and the laser is transmitted into the vacuum balance cavity (302) through the optical fiber (303).

3. An intelligent miniature switchgear device as claimed in claim 1, wherein said balancing metal film (301) is aluminum foil coated with white paint on its surface.

4. An intelligent miniature switchgear device according to claim 1, wherein said inductive electrical ring (111) is coaxial with said current detection ring (114) and is fitted over said upper contact arm (15) and/or said lower contact arm (18); the central control system (112) is connected to the tops of the induction electric ring (111) and the current detection ring (114), the temperature sensor (113) is arranged on the lower surface of the central control system (112), and the temperature sensor (113) is in contact with the upper contact arm (15) and/or the lower contact arm (18); a bearing plate (115) is fixed at the bottom end of the induction electric ring (111) or the current detection ring (114), and a second groove (116) matched with the bottom of the upper contact arm (15) and/or the lower contact arm (18) is formed in the upper surface of the bearing plate (115); the two opposite sides of the bearing plate (115) are hinged with a clamping plate (117) through hinges, and the clamping plate (117) is connected with the outer wall of the bearing plate (115) through a tension spring (118); the inner side surface of the clamping plate (117) is provided with a plurality of convex teeth.

5. The intelligent small-sized switch equipment as claimed in claim 1, wherein one side surface of the foamed aluminum (34) is attached to the inner wall of the handcart room (21), and the other side surface is attached to the partition plate (33); the projection of the foamed aluminum (34) on the surface of the partition plate (33) completely falls into the area where the partition plate (33) is located; and a plurality of third grooves (35) which are parallel to each other are formed in the surface of one side of the foamed aluminum (34) facing the inside of the cabinet body.

6. An intelligent miniature switchgear device as claimed in claim 1, wherein said partition (33) is a galvanized steel sheet; the density of the foamed aluminum (34) is 0.1-0.4 times of that of the metal aluminum.

7. An intelligent miniature switchgear device as claimed in claim 1, wherein said foamed aluminium (34) is soldered to said bulkhead (33) or bonded thereto by an adhesive.

8. An intelligent miniature switchgear device as claimed in claim 1, wherein said ground contact mounting plate (40) is fixed to the back plate (36) by means of bolts (42); the first straight plate section (37) and the second straight plate section (39) are both corrugated plates; the back plate (36) and the side plate are integrally formed.

9. An intelligent miniature switchgear device according to claim 1, wherein said fourth recess (41) is square, and a plurality of parallel connecting rods (43) are fixed between two opposite side walls of said fourth recess (41), said connecting rods (43) are also made of insulating material; the connecting rods (43) are distributed at equal intervals; a plurality of upward convex columns (44) are uniformly distributed on the connecting rod (43) along the axis direction of the connecting rod.

10. The intelligent small-sized switchgear device according to claim 1, wherein a plurality of condensing metal sheets (50) are fixed on the side wall of the condensing bin (47), the condensing metal sheets (50) are divided into two rows, namely a high row and a low row, and the two rows of condensing metal sheets (50) are arranged in a staggered manner; the bottom surface of the condensation bin (47) is an inclined plane with two high sides and a low middle part, and the drain pipe (49) is connected to the lowest position of the bottom surface of the condensation bin (47); a baffle plate (52) is arranged between the dehumidifying device (29) and the heating device (28), and the projection of the bell mouth (45) on the top surface of the baffle plate (52) is completely positioned in the area of the top surface of the baffle plate (52).

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