CN115116791A - Vacuum circuit breaker and vacuum circuit breaking protection system - Google Patents

Abstract

The application provides a vacuum circuit breaker and a vacuum circuit breaking protection system; wherein, vacuum circuit breaker includes: the circuit breaker comprises a circuit breaker body, a protection assembly and a controller, wherein the protection assembly is connected at two ends of the circuit breaker body in parallel, the controller is connected with the protection assembly through a communication cable, and the controller can control a closing phase angle of the protection assembly according to a closing instruction so that the closing phase angle of the protection assembly is consistent with voltage phase angles at two ends of the circuit breaker body. According to the vacuum circuit breaker and the vacuum circuit breaker protection system provided by the application, the switching-on inrush current of the vacuum circuit breaker can be effectively inhibited, the load equipment can be effectively protected, and the service life of the equipment is prolonged.

Description

Vacuum circuit breaker and vacuum circuit breaking protection system

Technical Field

The application relates to the technical field of electrical equipment, in particular to a vacuum circuit breaker and a vacuum circuit breaking protection system.

Background

The indoor ZN series vacuum circuit breaker used for domestic electric power at present has the advantages of small size, good arc extinguishing performance, long service life, small maintenance amount, safe use and the like, and is increasingly widely applied to medium-voltage systems and distribution power grids. In parallel capacitor compensation devices, vacuum circuit breakers are basically used to switch capacitor banks, in particular because of their advantage of being suitable for frequent operation.

However, when a capacitive load (such as a capacitor bank or a transformer) is switched on and off by using a vacuum circuit breaker, a large inrush current is easily generated when the vacuum circuit breaker is switched on, the inrush current is usually 6-8 times of the rated current of a loop, and can even reach more than ten times when the capacitive load is severe, each time the inrush current is switched on, the inrush current is equivalent to a short-circuit impact, multiple switching-on operations can bring cumulative damage to load equipment, and the service life of the equipment is shortened.

Therefore, it is an urgent technical problem to provide a vacuum circuit breaker capable of suppressing a switching inrush current.

Disclosure of Invention

The application provides a vacuum circuit breaker and vacuum short-circuit protection system to solve among the correlation technique vacuum circuit breaker and produce great inrush current when switching on and off capacitive load, cause the damage to load equipment, reduce equipment life's technical problem.

According to a first aspect of the present application, there is provided a vacuum circuit breaker comprising:

a main body of the circuit breaker is provided with a plurality of grooves,

the protection components are connected in parallel at two ends of the circuit breaker body,

the controller is connected with the protection assembly through a communication cable and can control the closing phase angle of the protection assembly according to a closing instruction so as to enable the closing phase angle of the protection assembly to be consistent with the voltage phase angles at the two ends of the circuit breaker body.

In one possible embodiment, the protection component comprises: and the closing phase angle of the closing device can be kept consistent with the voltage phase angles at the two ends of the circuit breaker body under the control of the controller.

In one possible embodiment, the closing device includes: the overvoltage protector is connected with the communicating piece in parallel, and the overvoltage protector is used for generating heat when the breaker body is switched on and switched off so as to absorb charge at two ends of the breaker body; the communicating piece is used for conducting before the breaker body.

In one possible embodiment, the protection component comprises: the first connecting arm is connected between one end of the breaker body and the switch-on device; the second connecting arm is connected between the other end of the breaker body and the switch-on device.

In one possible design, a connection port is provided on the switch-on device, and the connection port is used for connecting with the communication cable.

In one possible embodiment, the vacuum interrupter further comprises: the casing, be equipped with in the casing and hold the chamber, the circuit breaker body with the protection component is installed respectively hold the intracavity.

In a possible design, the housing, the circuit breaker body and the protection component are integrally sealed and molded.

In a possible design, a cable passage is provided in the housing, and the communication cable is buried in the cable passage.

In one possible embodiment, the vacuum interrupter further comprises: and the digital-to-analog converter is connected between the controller and the protection component and is used for converting a digital signal and an analog signal of the controller.

According to a second aspect of the present application, there is provided a vacuum break protection system comprising: the vacuum circuit breaker is provided by any possible design mode of the machine body and the first aspect of the application, and the vacuum circuit breaker is installed on the machine body.

According to the embodiment of the application, the protection assemblies are connected in parallel at the two ends of the breaker body of the vacuum circuit breaker, and the closing phase angle of the protection assemblies is controlled by the controller according to the voltage phase angles at the two ends of the breaker body, so that the closing phase angle of the protection assemblies is consistent with the voltage phase angles at the two ends of the breaker body. Like this, the protection subassembly switches on at ideal voltage phase angle, forms the route, can avoid the circuit breaker body to appear the phenomenon of discharging in advance when closing a floodgate to can effectively restrain vacuum circuit breaker switching-on surge, can effectively protect load equipment, improve equipment life.

The construction of the present application and other objects and advantages thereof will be apparent from the following detailed description taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic overall structure diagram of a first example of a vacuum circuit breaker provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a protection component provided in an embodiment of the present application;

fig. 3 is a schematic overall structure diagram of a second example of a vacuum circuit breaker provided in the embodiment of the present application;

FIG. 4 is a schematic structural diagram of a vacuum break protection system provided by an embodiment of the present application;

fig. 5 is a schematic diagram of a closing transmission of a vacuum circuit breaker according to an embodiment of the present disclosure;

fig. 6 is a schematic opening transmission diagram of a vacuum circuit breaker according to an embodiment of the present application.

Description of reference numerals:

10-a circuit breaker body; 20-a protective component; 30-a communication cable; 40-a housing; 50-a digital-to-analog converter;

11-a first contact; 12-a first contact arm; 13-static contact; 14-a second contact; 15-a second contact arm; 16-moving contact; 17-a vacuum arc-extinguishing chamber; 21-a switch-on device; 22-a first connecting arm; 23-a second connecting arm; 41-an accommodating cavity; 42-a wire-passing channel;

101-opening half shaft; 102-opening the brake and locking; 103-a main shaft; 104-a brake-separating spring; 105-a drive fulcrum; 106-contact compression spring; 107-a closing spring; 108-a drive cam; 211 — patch port.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

In the description of the embodiments of the present application, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of indicated technical features is significant. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present application, it is to be understood that the terms "inner," "outer," "upper," "bottom," "front," "back," and the like, if any, refer to the orientation or positional relationship shown in FIG. 1, which is used for ease of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting.

The embodiment of the application firstly provides a vacuum circuit breaker, and through connecting in parallel a protection subassembly at vacuum interrupter's both ends (being the static contact and the moving contact of circuit breaker body promptly), the protection subassembly passes through the communication cable and is connected with the controller, and the controller keeps unanimous with circuit breaker body switching-on phase place according to the closing signal control protection subassembly of circuit breaker body closing a floodgate angle. Like this, when closing a floodgate, the protection subassembly switches on, forms the route, can avoid the circuit breaker body to appear closing a floodgate in advance that discharges to can effectively restrain vacuum circuit breaker closing inrush current, can effectively protect load equipment, improve equipment life.

To further explain the specific structure and connection relationship of the vacuum circuit breaker provided in the embodiment of the present application in detail, referring to fig. 1, fig. 1 is a schematic view of the overall structure of the vacuum circuit breaker provided in the embodiment of the present application. According to a first aspect of embodiments of the present application, there is provided a vacuum circuit breaker including:

a circuit breaker body 10.

Specifically, in the embodiment of the present application, the breaker body 20 may be a ZN series breaker body, such as a ZN12-10 type, a ZN28A-10 type, a ZN65A-12 type, a ZN12A-12 type, a VS1 type, a ZN30 type, and the like.

Referring to fig. 1, the circuit breaker body 10 may include: the circuit comprises a first contact 11, a first contact arm 12 and a fixed contact 13, wherein the first contact 11 is electrically connected with a capacitor bank or a power supply, and the fixed contact 13 is electrically connected with the first contact through the first contact arm 12.

The circuit comprises a second contact 14, a second contact arm 15 and a movable contact 16, wherein the second contact 14 is electrically connected with a power supply or a capacitor bank, and the movable contact 16 is electrically connected with the second contact 14 through the second contact arm 15.

The moving contact 16 is operable to connect or disconnect with the stationary contact 13 to switch on or off the capacitor bank.

Thus, the circuit breaker body 10, the capacitor bank and the power supply can be ensured to form a completed first loop, and switching or breaking of the capacitor bank can be realized.

Wherein, the opening and closing of the movable contact 16 and the fixed contact 13 can be operated by an operating mechanism. In some possible approaches, the operating mechanism may be a spring operated mechanism, a CD10 solenoid operated mechanism, a CD17 solenoid operated mechanism, a CT19 spring charging operating mechanism, a CT8 spring charging operating mechanism, or the like.

It is understood that the circuit breaker body 10 may further include a vacuum interrupter 17, wherein the stationary contact 13 and the movable contact 16 are both disposed within the vacuum interrupter 17.

Those skilled in the art can understand that the circuit breaker body 10 may further include a shield disposed outside the vacuum arc-extinguishing chamber, and further include a main shield, a bellows shield, and a shield for voltage sharing surrounding the moving contact, and the specific arrangement manner of the main shield, the bellows shield, and the shield for voltage sharing may refer to the records in the related technical documents, which are not described in this embodiment.

In one specific example, the circuit breaker body 10 may be a vacuum circuit breaker with Bao Guang TD 15-12/1250-31.5B.

And the protection assemblies 20 are connected in parallel at two ends of the circuit breaker body 10. That is, in the embodiment of the present application, the protection assembly 20 is connected in parallel with the breaker body 10 in the circuit.

Specifically, the circuit breaker body 10 generally switches a capacitive load (e.g., a capacitor or a capacitor bank) through a vacuum arc-extinguishing chamber and a static contact and a moving contact arranged in the vacuum arc-extinguishing chamber; therefore, the protection component 20 may be connected in parallel at two ends of the vacuum arc-extinguishing chamber, and specifically may be electrically connected with the static contact and the moving contact, respectively.

And a controller (not shown in the figure) connected to the protection assembly 20 through the communication cable 30, wherein the controller can control a closing phase angle of the protection assembly 20 according to a closing command, so that the closing phase angle of the protection assembly 20 is consistent with voltage phase angles at two ends of the circuit breaker body 10.

Specifically, in the embodiment of the present application, the communication cable 30 may be a cable such as an optical fiber that can transmit a control signal.

Those skilled in the art will appreciate that the Controller may be a Central Processing Unit (CPU), a Micro Control Unit (MCU), a Field-Programmable Gate Array (FPGA), a Programmable Logic Controller (PLC), or the like.

During specific implementation, when the vacuum circuit breaker is in switching-on operation, firstly, a switching-on instruction is sent to the circuit breaker body, the switching-on instruction is simultaneously transmitted to a controller as a switching-on starting signal of the protection component 20, after the controller receives the switching-on starting signal, the voltage phase angles at two ends of the circuit breaker body 10 are judged, and the switching-on phase angle of the protection component 20 is controlled according to the voltage phase angles at two ends of the circuit breaker body 10, the protection component 20 is triggered to be switched on rapidly when an ideal switching-on phase angle is reached, the protection component 20 is switched on in the process, when the circuit breaker body 10 is switched on, pre-discharge does not exist at two ends, switching-on inrush current of the circuit breaker body 10 can be effectively inhibited, load equipment is effectively protected, and the service life of the equipment is prolonged.

According to the embodiment of the application, the protection assemblies 20 are connected in parallel at two ends of the breaker body 10 of the vacuum circuit breaker, and the closing phase angle of the protection assemblies 20 is controlled by the controller according to the voltage phase angle at two ends of the breaker body 10, so that the closing phase angle of the protection assemblies 20 is consistent with the voltage phase angle at two ends of the breaker body 10. In this way, the protection component 20 is turned on at the ideal voltage phase angle to form a path, which can prevent the pre-discharge phenomenon from occurring when the circuit breaker body 10 is closed, so that the closing inrush current of the vacuum circuit breaker can be effectively inhibited, the load equipment can be effectively protected, and the service life of the equipment can be prolonged.

In a specific implementation, the controller may detect the voltage waveform when receiving a closing instruction; the switching-on of the AB phase switch-on device of the protection component 20 is triggered at the AB line voltage zero crossing point, the switching-on of the C phase switch-on device of the protection component 20 is triggered by delaying a preset time length (for example, 5ms), and then the switching-on of the circuit breaker body 10 is triggered.

Experiments prove that the protection assemblies 20 are connected in parallel at the two ends of the breaker body 10, the closing phase angle of the protection assemblies 20 is controlled to be consistent with the voltage phase angles at the two ends of the breaker body 10 through the controller, the closing inrush current can be limited to be below 2.5 times of current, the moving contact 16 and the static contact 13 of the breaker body 10 can be effectively prevented from being broken down and ablated, and the probability of breaking down and re-ignition during opening can be effectively reduced.

Optionally, the protection component 20 includes: and the switch-on device 21, the switch-on device 21 is connected with the communication cable 30, and the switch-on phase angle of the switch-on device 21 can be kept consistent with the voltage phase angle of the two ends of the breaker body 10 under the control of the controller.

It is understood that in the embodiment of the present application, the switch 21 may be a switch remotely controlled by an electric signal. In some possible modes, a light signal remote control switch-on device, such as an infrared remote control switch-on device, can also be adopted.

It should be noted that, when a capacitive load (for example, a capacitor bank) is disconnected by using a vacuum circuit breaker, a high recovery overvoltage occurs at a disconnection point of the vacuum circuit breaker (i.e., at a moving contact and a fixed contact of the vacuum circuit breaker) because residual charging charges exist in the capacitor. When the arc is cut off, the phenomenon that the arc is delayed and re-punctured after the arc and can be burnt at high frequency (namely, re-burning phenomenon) exists. Once a re-ignition occurs, a re-ignition overvoltage of high magnitude is generated, especially multiple re-ignitions or multi-phase re-ignitions, which severely threatens and supplements device and system safety.

In order to avoid the re-ignition phenomenon, in the embodiment of the present application, the switch-on device 21 includes: the circuit breaker comprises an overvoltage protector and a communicating piece, wherein the overvoltage protector is connected with the communicating piece in parallel and used for generating heat when the circuit breaker body 10 is disconnected so as to absorb charge charges at two ends of the circuit breaker body 10; the communication member is used for conduction before the breaker body 10.

Specifically, due to the physical characteristics of the overvoltage protection device 20, when the voltage across the overvoltage protection device 20 is low (e.g., normal phase voltage), the overvoltage protection device 20 is in a high configuration, that is, the resistance of the overvoltage protection device 20 is large, so that the circuit passing through the overvoltage protection device 20 is in an open circuit or an open circuit state, and the capacitor bank is conducted with the circuit formed by the circuit breaker body 10 and the power supply.

When the circuit breaker body 10 opens the capacitor bank, the moving contact 16 and the fixed contact 13 of the circuit breaker body 10 are opened, and a high recovery overvoltage (i.e., a voltage value exceeding a preset threshold) occurs at a fracture between the moving contact 16 and the fixed contact 13 due to the residual charging charge in the capacitor bank. Since the overvoltage protector 20 is connected in parallel to the breaker body 10, the voltage across the overvoltage protector 20 is the same as the voltage across the breaker body 10. Overvoltage protector 10 becomes the low resistance state from high resistance state, and overvoltage protector 20 becomes to form the second loop between capacitor bank and power for electrical apparatus promptly, and like this, overvoltage protector 20 can be through mode such as generate heat with the energy absorption release of the residual charge on the capacitor bank, can reduce the recovery overvoltage at circuit breaker body 10 both ends fast. Therefore, the phenomenon of arc back delay re-breakdown when the breaker body 10 is switched on and off can be avoided, and the phenomenon of high-frequency arcing (namely re-ignition phenomenon) is avoided. The system safety is effectively protected.

The voltage value of the preset threshold value can be obtained through multiple tests. For example, the determination is made based on the voltage value at which the re-ignition or re-strike occurs over a number of tests. Specifically, the predetermined threshold may be a voltage slightly less than or approximately equal to the voltage at which the restrike or restrike occurs. In some possible specific examples, the preset threshold may be 1.2 times the peak phase voltage value or 1.5 times the peak phase voltage value, etc.

Specifically, in the embodiment of the present application, the communicating member has a spark gap and a driving module, when the controller sends a closing command to the switch-on device, the driving module acts, and the spark gap is discharged and conducted before the circuit breaker body 10 is conducted, so that inrush current is prevented from occurring when the circuit breaker body 10 is discharged and conducted.

Further, the protection assembly 20 further includes: a first connection arm 22 and a second connection arm 23, the first connection arm 22 being connected between one end of the circuit breaker body 10 and the closer 21; the second connecting arm 23 is connected between the other end of the breaker body 10 and the closer 21.

Specifically, since the protection assembly 20 needs to be electrically connected to the circuit breaker body 10, the first connecting arm 22 may be made of a conductive material with good conductivity, such as a copper sheet, an aluminum sheet, or other conductive materials. Referring to fig. 1, the first connecting arm 22 may be electrically connected to the shutter 21 by means of a screw, a bolt, or the like. In some possible ways, the first connecting arm 22 may also be electrically connected with the shutter 21 by means of welding (e.g., spot welding).

Wherein, the first connecting arm 22 can be fixedly connected to the breaker body 10 through a fixed connector. In some possible ways, the fixed connector may be a conductive rod that passes through the first connecting arm 22 and extends to the circuit breaker body 10. In this way, the first connecting arm 22 is fixedly connected to the circuit breaker body 10, so that the circuit breaker body 10 and the closing device 21 are connected in parallel. Connect first connecting arm 22 and circuit breaker body 10 through the conducting rod, guaranteed the stability that first connecting arm 22 is connected with circuit breaker body 10 electricity to guaranteed that combined floodgate ware 21 can switch on at the both ends of circuit breaker body 10 and form the second circuit, pre-discharge when effectively avoiding circuit breaker body 10 to close a floodgate.

In some possible ways, the switch 21 may be selected as a switch with a built-in overvoltage protector. In this way, the protective assembly 20 is a unitary body that can be easily removed and installed.

Specifically, in the embodiment of the present application, the overvoltage protector is a sensitive ceramic element.

The parameters of the sensitive ceramic element can be selected according to actual needs, and specifically can be selected according to the voltage value of the phenomenon of heavy breakdown or heavy ignition. For example, if the phenomenon of re-breakdown or re-ignition occurs at 1.8 times of the peak value of the phase voltage, the parameter of the sensitive ceramic element may be selected as the electric field sensitive ceramic element of which the voltage at two ends is slightly smaller than or close to 1.8 times of the peak value of the phase voltage and the resistance state changes (for example, changes from the high resistance state to the low resistance state).

Thus, the voltage across the circuit breaker body 10 can be limited to 1.8 times the peak value of the phase voltage. The restriking and the heavy breakdown in the on-off process of the vacuum circuit breaker can be effectively inhibited, the energy stored by the capacitor bank is released, the voltage of the capacitor bank is rapidly reduced, and the vacuum circuit breaker is helped to smoothly turn on or off the capacitor bank.

Optionally, referring to fig. 1 and fig. 2, in the embodiment of the present application, a connection port 211 is formed on the switch-on device, and the connection port 211 is used for connecting with the communication cable 30.

Specifically, in the embodiment of the present application, the connection port 211 may be integrally formed with the switch 21, that is, the connection port 211 is reserved when the switch 21 is produced.

Therefore, the communication cable 30 can be conveniently connected with the closing device 21, and the installation and connection efficiency is improved.

Optionally, referring to fig. 1, in this embodiment of the application, the vacuum circuit breaker further includes: the casing 40 is equipped with in the casing 40 and holds chamber 41, and circuit breaker body 10 and protection component 20 are installed respectively in holding chamber 41.

It can be understood that, the vacuum circuit breaker is used for switching the loads such as the capacitor, the inductor and the like so as to meet the requirement of frequent operation of the loads such as the capacitor bank or the inductor and the like; that is, the vacuum circuit breaker is inevitably electrically connected to a load such as a capacitor bank and a power supply device such as a power supply. Therefore, the vacuum circuit breaker needs to be insulated. That is, those skilled in the art will appreciate that the housing 40 may be made of an insulating material.

Wherein, hold the chamber 41 and can be two and set up side by side hold the chamber, and circuit breaker body 10 and protection component 20 are installed respectively in one of them holds chamber 41, like this, just can make insulating isolation between circuit breaker body 10 and the protection component 20.

Optionally, for further reducing the overall structure of the vacuum circuit breaker that this application embodiment provided, reduce the whole spare part quantity that needs the installation to be changed, regard vacuum circuit breaker as whole installation. In the embodiment of the present application, the material of the housing 40 may be thermoplastic epoxy resin.

In a specific production, the circuit breaker body 10 and the over-protection assembly 20 may be mounted and connected, and then the housing 40 is obtained by casting a thermoplastic epoxy resin on the outside of the circuit breaker body 10 and the protection assembly 20.

In this way, the conductive parts such as the main body 10 and the protection assembly 20 can be completely embedded in the housing 40, and after the epoxy resin is cured, a pole is formed in the solid insulating material, so that the whole vacuum circuit breaker becomes an integral component. Thereby simplifying the structure of the vacuum circuit breaker, reducing the detachable parts and increasing the reliability; and the insulating material also has extremely high insulating capability, changes surface insulation into volume insulation, reduces the influence of the environment, and can be applied to the heavily polluted environment. In addition, the size of the vacuum circuit breaker can be reduced, and the vacuum circuit breaker is favorable for being installed in a centrally installed switchgear.

Further, referring to fig. 1, in the embodiment of the present application, a wire passage 42 is disposed in the housing 40, and the communication cable 30 is embedded in the wire passage 42.

Specifically, the wire passage 42 may be integrally formed with the housing 40. In some possible ways, the wire passage 42 may also be obtained by secondary processing after the housing 40 is molded.

Further, referring to fig. 3, fig. 3 is a schematic view of an overall structure of a second example of the vacuum circuit breaker provided in the embodiment of the present application. In an embodiment of the present application, the vacuum circuit breaker further includes: a digital-to-analog converter 50, the digital-to-analog converter 50 being connected between the controller and the protection component 20, the digital-to-analog converter 50 being used for converting the digital signal and the analog signal of the controller.

Fig. 4 is a schematic structural diagram of a vacuum break protection system according to an embodiment of the present application. Referring to fig. 4, according to a second aspect of an embodiment of the present application, there is provided a vacuum break protection system, including: in an alternative embodiment of the first aspect of the embodiments of the present application, the vacuum interrupter is mounted to the housing.

The machine body can be a middle cabinet in the related art, and the controller can be arranged in the middle cabinet.

Further, referring to fig. 5, fig. 5 is a schematic closing transmission diagram of the vacuum circuit breaker according to the embodiment of the present application. In the embodiment of the application, after the vacuum circuit breaker is installed on the machine body, the switching or the on-off of the capacitor bank can be realized through the operating mechanism in specific use.

In the embodiment of the present application, during a switching-on process of the vacuum circuit breaker (that is, when the movable contact 16 contacts the stationary contact 13 under the elastic force of the contact pressure spring 106), a switching-on command is first sent to the circuit breaker body 10, and the command is simultaneously sent to the controller as a start signal of the switch-on device 21, and the controller receives the signal and then determines a proper switching-on angle of the switch-on device 21, and rapidly switches on the switch-on device 21.

The circuit breaker stores energy for a closing spring 107 in an electric or manual mode, when the circuit breaker is closed, the stored energy of the closing spring is rapidly released through electric or manual operation, a driving cam 108 rotates, the driving cam 108 impacts a roller on a main shaft, the driving main shaft 103 rotates, the driving part rotates anticlockwise at a transmission fulcrum 105 to push a moving contact 16 of a vacuum arc extinguish chamber 17 to move towards a static contact 13 (in the direction shown by an arrow in the figure), and meanwhile, energy is stored for a contact pressure spring 106 and a separating pressure spring 104, and after the moving contact 16 in the vacuum arc extinguish chamber 17 is contacted with the static contact 13, the separating lock 102 in a machine body keeps a closing state, and the closing process is completed.

The power supply forms a loop with the capacitor bank through the first contact 11, the first contact arm 12, the moving contact 16 and the static contact 13 which are positioned in the vacuum arc-extinguishing chamber 17, the second contact arm 15 and the second contact 14, and the capacitor bank is electrified, at the moment, no port exists because the static contact 13 is in contact with the moving contact 16, and no voltage exists.

Further, referring to fig. 6, fig. 6 is a schematic diagram of an opening transmission of a vacuum circuit breaker according to an embodiment of the present application. When the vacuum circuit breaker is opened (for example, the opening half shaft 101 is rotated through manual or electric operation), the opening lock catch 102 is disengaged, and under the upward acting force of the opening spring 104 and the downward acting force of the contact pressure spring 106 (described by taking fig. 6 as an example), the transmission fulcrum 105 is rotated clockwise, so that the movable contact 16 and the fixed contact 13 in the vacuum arc extinguish chamber which are originally contacted are separated; at this time, there is a recovery overvoltage at the break between the moving contact 16 and the stationary contact 13. When the recovered overvoltage exceeds the preset threshold, due to the physical characteristics (such as the characteristic sensitive to an electric field) of the overvoltage protector, the overvoltage protector is changed from a high-resistance state to a low-resistance state, namely, the overvoltage protector acts, so that the voltage value of a fracture of the vacuum arc extinguish chamber is limited, and the restriking-through of the vacuum circuit breaker in the opening and closing process are effectively inhibited.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A vacuum interrupter, comprising:

a circuit breaker body (10),

a protection assembly (20), wherein the protection assembly (20) is connected in parallel at two ends of the breaker body (10),

the controller is connected with the protection component (20) through a communication cable (30), and the controller can control the closing phase angle of the protection component (20) according to a closing instruction so that the closing phase angle of the protection component (20) is consistent with the voltage phase angles at the two ends of the circuit breaker body (10).

2. Vacuum interrupter according to claim 1, characterized in that the protection assembly (20) comprises: the switch-on device (21) is connected with the communication cable (30), and the switch-on phase angle of the switch-on device (21) can be kept consistent with the voltage phase angle of the two ends of the breaker body (10) under the control of the controller.

3. Vacuum interrupter according to claim 2, characterized in that the switch-on (21) comprises: the overvoltage protection device is connected with the communicating piece in parallel, and the overvoltage protection device is used for generating heat when the breaker body (10) is switched on and off so as to absorb charging charges at two ends of the breaker body (10); the communicating piece is used for conducting before the breaker body (10).

4. Vacuum interrupter according to claim 3, characterized in that the protection assembly (20) further comprises: a first connection arm (22) and a second connection arm (23), the first connection arm (22) being connected between one end of the circuit breaker body (10) and the shutter (21); the second connecting arm (23) is connected between the other end of the breaker body (10) and the switch-on device (21).

5. Vacuum interrupter according to claim 2, characterized in that the switch closer (21) is provided with a connection port (211), the connection port (211) being adapted for connection to the communication cable (30).

6. Vacuum interrupter according to claim 1, characterized in that the vacuum interrupter further comprises: the circuit breaker comprises a shell (40), wherein a containing cavity (41) is formed in the shell (40), and the circuit breaker body (10) and the protection assembly (20) are installed in the containing cavity (41) respectively.

7. Vacuum interrupter according to claim 6, characterized in that the housing (40), the interrupter body (10) and the protection assembly (20) are integrally sealed.

8. Vacuum interrupter according to claim 6, characterized in that a line channel (42) is provided in the housing (40), the communication cable (30) being embedded in the line channel (42).

9. Vacuum interrupter according to any of the claims 1-8, characterized in that the vacuum interrupter further comprises: a digital-to-analog converter (50), the digital-to-analog converter (50) being connected between the controller and the protection component (20), the digital-to-analog converter (50) being configured to convert a digital signal and an analog signal of the controller.

10. A vacuum break protection system, comprising: a vacuum interrupter as claimed in any one of claims 1 to 9 and a body, said vacuum interrupter being mounted on said body.

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