A double-break vacuum circuit breaker device

Abstract

The present invention provides a double-break vacuum circuit breaker device integrating detection and power supply, belonging to the technical field of vacuum switches. The device includes: a first vacuum interrupter and a second vacuum interrupter, and a transmission module respectively connected to the first vacuum interrupter and the second vacuum interrupter. The device further includes: a closing drive circuit, a tripping drive circuit, a second current transformer and a phase control module. The phase control module is used to control the closing drive circuit to stop outputting the closing driving force to the transmission module, and control the tripping drive circuit to start outputting the tripping driving force to the transmission module. By applying the device provided by the present invention to the switching of power grid equipment, the self-power supply and intelligent phase selection operation of the double-break vacuum circuit breaker device integrating detection and power supply can be realized, and the phenomenon that the double-break vacuum circuit breaker device integrating detection and power supply is prone to delayed breakdown during the fault or load current interruption process can also be avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum switches, and particularly relates to a double-break vacuum circuit breaker device. Background Art

[0002] Compared with traditional vacuum switches driven by operating mechanisms such as electromagnetic, permanent magnet, and spring, fast vacuum switches have significant advantages such as short opening time and low dispersion, and have precise operating characteristics comparable to those of power electronic switches.

[0003] However, current fast vacuum switch products still rely on mains power supply for charging the closing and opening energy storage capacitors, and cannot achieve the function of automatically charging the energy storage capacitors during operation, which limits their application expansion in more complex working condition fields. In addition, due to the inability to achieve self-power supply, the technical requirements for ground insulation of fast vacuum switches are relatively high in some applications, increasing the manufacturing cost. Therefore, the technical problems faced by current fast vacuum switch products need to be solved urgently. Summary of the Invention

[0004] In view of the above problems, embodiments of the present application provide a double-break vacuum circuit breaker device to overcome or at least partially solve the above problems.

[0005] Embodiments of the present application provide a double-break vacuum circuit breaker device, the device includes: a first vacuum interrupter and a second vacuum interrupter, and a transmission module respectively connected to the first vacuum interrupter and the second vacuum interrupter, the transmission module is used to control the closing and opening of the first vacuum interrupter and the second vacuum interrupter;

[0006] Wherein, the device further includes:

[0007] A closing drive circuit, configured to output a closing driving force to the transmission module to control the closing of the first vacuum interrupter and the second vacuum interrupter;

[0008] An opening drive circuit, configured to output an opening driving force to the transmission module to control the opening of the first vacuum interrupter and the second vacuum interrupter;

[0009] A first current transformer, connected to the first vacuum interrupter, configured to sense the current flowing through the first vacuum interrupter when the first vacuum interrupter and the second vacuum interrupter are closed; wherein, the current output terminal of the first current transformer is electrically connected to the input terminals of the closing drive circuit and the opening drive circuit respectively, and is used to output the sensed current to the closing drive circuit and the opening drive circuit for electrical energy storage;

[0010] A second current transformer, connected to the second vacuum interrupter, for detecting the current flowing through the second vacuum interrupter;

[0011] A phase control module, the input end of the phase control module is electrically connected to the second current transformer, and the output end is respectively connected to the control ends of the closing drive circuit and the opening drive circuit, and is used for controlling the closing drive circuit to stop outputting the closing driving force to the transmission module and controlling the opening drive circuit to start outputting the opening driving force to the transmission module when the current flowing through the second vacuum interrupter exceeds a preset current.

[0012] Optionally, the closing drive circuit includes: a first energy storage unit, a first switch unit and a closing coil, wherein the first energy storage unit, the first switch unit and the closing coil are sequentially connected in series to the closing drive circuit;

[0013] The first energy storage unit is used for storing electric energy. When the first switch unit is in a conducting state, the electric energy stored in the first energy storage unit is released into the closing coil to generate the closing driving force for controlling the transmission module;

[0014] The opening drive circuit includes: a second energy storage unit, a second switch unit and an opening coil; wherein the second energy storage unit, the second switch unit and the opening coil are sequentially connected in series to the opening drive circuit;

[0015] The second energy storage unit is used for storing electric energy. When the second switch unit is in a conducting state, the electric energy stored in the second energy storage unit is released into the opening coil to generate the opening driving force for controlling the transmission module.

[0016] Optionally, the transmission module includes: a scissor-type transmission device, an insulating pull rod and a repulsive mechanism transmission part; wherein,

[0017] The first end of the scissor-type transmission device is mechanically connected to the moving conductive rod side of the first vacuum interrupter, the second end of the scissor-type transmission device is mechanically connected to the moving conductive rod side of the second vacuum interrupter, and the third end of the scissor-type transmission device is mechanically connected to one end of the insulating pull rod;

[0018] The other end of the insulating pull rod is mechanically connected to the repulsive mechanism transmission part, and the repulsive mechanism transmission part is located between the closing coil and the opening coil.

[0019] Optionally, the device further includes: a contact spring and / or a bistable spring; wherein:

[0020] The contact spring is installed between the scissor-type transmission device and the first vacuum interrupter, and between the scissor-type transmission device and the second vacuum interrupter, and is used to reduce the opening time of the first vacuum interrupter and the second vacuum interrupter;

[0021] The bistable spring is installed on both sides of the rod body of the insulating pull rod and is used to reduce the opening time of the first vacuum interrupter and the second vacuum interrupter.

[0022] Optionally, the device further includes: a rectification module, the input end of the rectification module is electrically connected to the first current transformer, and the output end is electrically connected to the input ends of the closing drive circuit and the opening drive circuit respectively;

[0023] The rectification module is used to rectify the current induced by the first current transformer and then output it to the closing drive circuit and the opening drive circuit for electrical energy storage.

[0024] Optionally, the rectification module is a full-bridge rectification circuit or a half-bridge rectification circuit.

[0025] Optionally, the phase control module stores at least one of a short-circuit fault rapid identification algorithm, a fault current zero-crossing prediction algorithm, and a capacitive or inductive load current zero-crossing prediction algorithm.

[0026] Optionally, the installation position of the first current transformer is any one of the insulating outer shell side, the static conductive end side, and the moving conductive rod side of the first vacuum interrupter;

[0027] The installation position of the second current transformer is any one of the insulating outer shell side, the static conductive end side, and the moving conductive rod side of the second vacuum interrupter.

[0028] Optionally, the first current transformer is an energy-supplying current transformer, and the second current transformer is a detection current transformer.

[0029] Optionally, the first switch unit and the second switch unit are at least one electronic switch device among controllable thyristors, insulated gate bipolar transistors, and insulated gate controlled thyristors.

[0030] The device provided by the present invention mainly has the following advantages:

[0031] 1. Achieve self - powered charging for the opening and closing of a double - break vacuum circuit breaker. The current flowing through the first vacuum interrupter is induced by the first current transformer, and the current is transmitted to the closing drive circuit and the opening drive circuit through a rectification module for storage. When the double - break vacuum circuit breaker needs to be opened, the self - powered charging can be achieved by obtaining the electrical energy stored in the opening drive circuit, and then the opening or closing actions of the first vacuum interrupter and the second vacuum interrupter can be controlled.

[0032] When the fast double - break vacuum circuit breaker needs to be closed, the closing actions of the first vacuum interrupter and the second vacuum interrupter are controlled by obtaining the electrical energy stored in the closing drive circuit.

[0033] 2. Achieve phase - controlled short - arc fast interruption of short - circuit fault current. By providing an accurate current detection signal through the second current transformer and cooperating with the phase - controlled control module to issue control instructions acting on the closing drive circuit and the opening drive circuit, the phase - controlled short - arc fast interruption of short - circuit fault current can be achieved.

[0034] 3. Precisely control the switching process of capacitive and inductive loads and expand the application fields. Through the algorithms stored in the phase - controlled control module, the switching process of capacitive and inductive loads can be precisely controlled. In addition, it can be used as a modular unit, and higher - voltage levels, larger breaking currents, and higher - rated current applications can be achieved through series - parallel combinations. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 is a schematic diagram of a double - break vacuum circuit breaker device provided by an embodiment of the present application;

[0037] Figure 2 is a schematic diagram of the closing and opening positions of a vacuum interrupter provided by an embodiment of the present application;

[0038] Figure 3 is a schematic diagram of the principle of a double - break vacuum circuit breaker device provided by an embodiment of the present application;

[0039] Figure 4 is a schematic diagram of the installation positions of a contact spring and a bistable spring provided by an embodiment of the present application;

[0040] Figure 5 is a schematic diagram of the opening current waveform with a long arcing time for short - circuit fault current provided by an embodiment of the present application;

[0041] Figure 6 It is a schematic diagram of a capacitive and inductive load current phase-controlled long arcing time interruption current waveform provided by an embodiment of the present application;

[0042] Figure 7 It is a schematic diagram of the installation position of a current transformer provided by an embodiment of the present application;

[0043] Description of reference numerals:

[0044] 101 - First vacuum interrupter; 102 - Second vacuum interrupter; 103 - Transmission module; 104 - Closing drive circuit; 105 - Tripping drive circuit; 106 - First current transformer; 107 - Second current transformer; 108 - Phase control module; 109 - Rectification module; 110 - Contact spring; 111 - Bistable spring; 1031 - Scissor-type transmission device; 1032 - Insulating pull rod; 1033 - Repulsion mechanism transmission part; 1041 - First energy storage unit; 1042 - First switch unit; 1043 - Closing coil; 1044 - First diode; 1051 - Second energy storage unit; 1052 - Second switch unit; 1053 - Tripping coil; 1054 - Second diode. Detailed implementation manners

[0045] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be completely conveyed to those skilled in the art.

[0046] When the fast vacuum switch is used as a line circuit breaker to realize the protection of the power grid short circuit, or the phase selection switching of the reactive power compensation capacitor bank and the shunt reactor, on the one hand, it can greatly reduce the disconnection time of the system short circuit fault, improve the transient stability of the system operation, increase the transmission capacity of the system section, and accelerate the rapid interaction of the source-grid-load-storage; on the other hand, it can reduce the closing high-frequency inrush current when the capacitor bank is vacuum switched, reduce the probability of post-arc re-breakdown, and at the same time can reduce the problems such as high-frequency reignition and reignition overvoltage when the shunt reactor is vacuum interrupted, and improve the safety level of the equipment operation.

[0047] At present, the charging of the closing and opening energy storage capacitors of fast vacuum switch products mostly relies on mains power supply. For some high-voltage fast vacuum switches at the transmission level and fast vacuum switch type power transmission and distribution devices, such as 252kV / 2500A-40kA and 363kV / 5000A-63kA open fast vacuum circuit breakers, as well as 750kV fast switch type economic current limiters, the power supply for the high-voltage side fast switch device by the motor-driven generator on the low-voltage side of the insulation platform has been realized. However, the above power supply technology still cannot achieve the self-power supply of the closing and opening energy storage capacitors during the operation of the fast vacuum switch, which restricts the application expansion of the fast vacuum switch to more complex working conditions. For example, when applying a fast vacuum circuit breaker at the distribution voltage level with a floating potential to the protection of transmission lines of 110kV and above, or even for the switching of filters in a 750kV converter station, when ensuring that the insulation withstand voltage level of the breaker contacts meets the application requirements, if the fast vacuum circuit breaker can achieve the self-power supply of the closing and opening energy storage capacitors, it will greatly reduce the technical requirements for the ground insulation of the switchgear and significantly reduce its manufacturing cost. This is also the solution for the vacuum switch to achieve applications at higher voltage levels of 110kV and above.

[0048] Referring to Figure 1 , Figure 1 is a schematic diagram of a double-break vacuum circuit breaker device provided by an embodiment of the present application. The device includes: a first vacuum interrupter 101, a second vacuum interrupter 102, a transmission module 103, a closing drive circuit 104, an opening drive circuit 105, a first current transformer 106, a second current transformer 107, and a phase control module 108.

[0049] The first vacuum interrupter 101 and the second vacuum interrupter 102, and a transmission module 103 respectively connected to the first vacuum interrupter 101 and the second vacuum interrupter 102. The transmission module 103 is used to control the closing and opening of the first vacuum interrupter 101 and the second vacuum interrupter 102.

[0050] Wherein, the device further includes:

[0051] A closing drive circuit 104, which is used to output a closing driving force to the transmission module 103 to control the closing of the first vacuum interrupter 101 and the second vacuum interrupter 102.

[0052] An opening drive circuit 105, which is used to output an opening driving force to the transmission module 103 to control the opening of the first vacuum interrupter 101 and the second vacuum interrupter 102.

[0053] The first current transformer 106 is connected to the first vacuum interrupter 101 and is used to sense the current flowing through the first vacuum interrupter 101 when the first vacuum interrupter 101 and the second vacuum interrupter 102 are closed. Wherein, the current output terminals of the first current transformer 106 are electrically connected to the input terminals of the closing drive circuit 104 and the opening drive circuit 105 respectively, and are used to output the sensed current to the closing drive circuit 104 and the opening drive circuit 105 for electrical energy storage.

[0054] The second current transformer 107 is connected to the second vacuum interrupter 102 and is used to detect the current flowing through the second vacuum interrupter 102.

[0055] The phase control module 108 has its input terminal electrically connected to the second current transformer 107, and its output terminals are respectively connected to the control terminals of the closing drive circuit 104 and the opening drive circuit 105. When the current flowing through the second vacuum interrupter 102 exceeds a preset current, it is used to control the closing drive circuit 104 to stop outputting the closing driving force to the transmission module 103, and to control the opening drive circuit 105 to start outputting the opening driving force to the transmission module 103.

[0056] In this embodiment, the main functions of the first vacuum interrupter 101 and the second vacuum interrupter 102 are to quickly guide the arc into a vacuum environment when interrupting the current or disconnecting the circuit, and to quickly extinguish the arc through arc extinguishing measures to ensure the normal operation and reliability of the equipment.

[0057] Refer to Figure 2 , Figure 2 is a schematic diagram of the closing and opening positions of the vacuum interrupter provided by the embodiment of the present application. The closing and opening positions of the first vacuum interrupter 101 and the second vacuum interrupter 102 are shown in the figure. The opening position is described with the first vacuum interrupter 101. The left side of the first vacuum interrupter 101 is the static conductive terminal side, and the right side is the moving conductive rod side. 1011 means that the first vacuum interrupter 101 is in the opening state at this time, that is, the contacts on the static conductive terminal side and the moving conductive rod side are separated. Similarly, 1021 means that the first vacuum interrupter 101 is in the opening state. Assume that the static conductive terminal side of the first vacuum interrupter 101 is connected to the power supply, and the static conductive terminal of the second vacuum interrupter 102 is connected to the load. When a fault occurs in the current provided by the power supply to the load, by controlling the transmission module 103, the first vacuum interrupter 101 and the second vacuum interrupter 102 can be opened to disconnect the connection between the power supply and the load, preventing the fault current from burning the load.

[0058] The opening position is described by the first vacuum interrupter 101. The left side of the first vacuum interrupter 101 is the static conductive terminal side, and the right side is the moving conductive rod side. 1012 means that the first vacuum interrupter 101 is in the closing state at this time, that is, the contacts on the static conductive terminal side and the moving conductive rod side are in contact. Similarly, 1022 means that the first vacuum interrupter 101 is in the closing state. Assume that the static conductive terminal side of the first vacuum interrupter 101 is connected to the power supply, and the static conductive terminal of the second vacuum interrupter 102 is connected to the load. When the power supply needs to supply current to the load, by controlling the drive module 103, the first vacuum interrupter 101 and the second vacuum interrupter 102 can be closed to conduct the connection between the power supply and the load, and the load will obtain current and operate reliably.

[0059] One end of the drive module 103 is connected to the moving conductive rod side of the first vacuum interrupter 101, and the other end is connected to the moving conductive rod side of the second vacuum interrupter 102. Under the driving action of the opening driving force or the closing driving force, the opening or closing of the first vacuum interrupter 101 and the second vacuum interrupter 102 is controlled.

[0060] The first current transformer 106 is sleeved on the connecting rod between the moving conductive rod side of the first vacuum interrupter 101 and the drive module 103. The first current transformer 106 is used to sense the current flowing through the first interrupter 101 and act as an external power source to supply electrical energy to the closing drive circuit 104 and the opening drive circuit 105.

[0061] The second current transformer 107 is sleeved on the connecting rod between the moving conductive rod side of the second vacuum interrupter 102 and the drive module 103. The first current transformer 106 can also be installed by exchanging positions with the second current transformer 107.

[0062] The second current transformer 107 is used to sense and detect the current flowing through the second interrupter. When the detected current is a fault current, the fault current is transmitted to the phase control module 108.

[0063] The phase control module 108 then issues corresponding control instructions, which act on the closing drive circuit 104 to close the discharge circuit of the closing drive circuit 104, and act on the opening drive circuit 105 to conduct the discharge circuit of the closing drive circuit 104.

[0064] At this time, since the closing drive circuit 104 closes the discharge circuit, the closing driving force will be prohibited from being output to the drive module 103. By controlling the opening drive circuit 105 to open the discharge circuit, the closing driving force will be output to the drive module 103 to control the opening of the first vacuum interrupter 101 and the second vacuum interrupter 102.

[0065] The opening driving force is the downward electromagnetic repulsion generated by the opening drive circuit 105 on the transmission module 103, which causes the first vacuum interrupter 101 and the second vacuum interrupter 102 to open simultaneously.

[0066] The closing driving force is the upward electromagnetic repulsion generated by the opening drive circuit 105 on the transmission module 103, which can push the transmission module 103 upward and cause the first vacuum interrupter 101 and the second vacuum interrupter 102 to close simultaneously.

[0067] In a preferred embodiment, the device further includes a rectification module 109. The input end of the rectification module 109 is electrically connected to the first current transformer 106, and the output end is electrically connected to the input ends of the closing drive circuit 104 and the opening drive circuit 105 respectively.

[0068] The rectification module 109 is used to rectify the current induced by the first current transformer 106 and then output it to the closing drive circuit 104 and the opening drive circuit 105 for electrical energy storage.

[0069] The following combines Figure 3 , to elaborate on the function of the rectification module 109. The function of the rectification module 109 is to convert the current induced by the first current transformer 106. In practice, the induced current is generally alternating current, and the rectification module 109 can convert the alternating current into direct current and finally output the direct current to the first energy storage unit 1041 and the second energy storage unit 1051 respectively for electrical energy storage.

[0070] In this embodiment, combined with Figure 3 , Figure 3 is a schematic diagram of the principle of a double-break vacuum circuit breaker device provided by an embodiment of the present application. Taking a 40.5 kV double-break phase-controlled integrated detection and energy supply double-break vacuum circuit breaker device as an example for detailed description, where both the first vacuum interrupter 101 and the second vacuum interrupter 102 use vacuum interrupters with a rated voltage of 24 kV and a rated contact opening distance of 15 mm.

[0071] When the first vacuum interrupter 101 and the second vacuum interrupter 102 are in the closing operation state, the first current transformer 106 senses the current flowing through the first vacuum interrupter 101 and conducts the current through the rectification module 109 to the first energy storage unit 1041 and the second energy storage unit 1051 for charging. The first energy storage unit 1041 and the second energy storage unit 1051 perform electrical energy storage. The first energy storage unit 1041 and the second energy storage unit 1051 are energy storage capacitors.

[0072] Meanwhile, when the first vacuum interrupter 101 and the second vacuum interrupter 102 are in the closing operation state, the second current transformer 107 transmits the detected current flowing through the second vacuum interrupter 102 and transmits it to the phase control module 108.

[0073] If the current transmitted to the phase control module 108 is a fault current, the phase control module 108 can send control instructions to the first switch unit 1042 and the second switch unit 1052 according to the algorithm stored internally or external control instructions, control the closing of the first switch unit 1042, close the discharge circuit of the closing drive circuit 104, the second switch unit 1052 conducts, and open the discharge circuit of the opening drive circuit 105, so as to realize that the drive module 103 drives the series-connected first vacuum interrupter 101 and the second vacuum interrupter 102 to perform the phase selection breaking operation of the fault current under the action of the electromagnetic repulsion force of the opening coil 1053.

[0074] In addition, when the first vacuum interrupter 101 and the second vacuum interrupter 102 are in the closing operation state, when the double-break vacuum circuit breaker device integrating detection and energy supply performs the breaking of capacitive or inductive loads, in order to ensure that the contact gap has a high insulation strength after the circuit breaker breaks the load current, the phase control module 108 judges the zero-crossing point of the load current based on the load current signal detected by the second current transformer 107, and combines the opening time parameter of the double-break vacuum circuit breaker device integrating detection and energy supply, and instructs it to perform the breaking operation of the capacitive or inductive load current with a longer arcing time. The specific operation is the same as when the current transmitted to the phase control module 108 is a fault current, and will not be elaborated here.

[0075] By applying the device provided by the present invention to the switching of power grid equipment, not only can the self-powered charging of the closing and opening energy storage capacitors of the double-break vacuum circuit breaker device integrating detection and energy supply be realized, but also accurate current detection signals can be provided for the phase-controlled short arcing and rapid opening of the short-circuit fault current and the accurate phase-controlled switching of capacitive and inductive loads of the double-break vacuum circuit breaker device integrating detection and energy supply.

[0076] In addition, when the potential suspension scheme is adopted and applied to voltage levels of 110 kV and above, through the self-powered technology of the closing and opening energy storage capacitors, only the insulation withstand voltage level of the disconnector under normal and fault conditions of the high potential of the double-break vacuum circuit breaker device integrating detection and energy supply needs to be considered, which is convenient to use vacuum switches with low voltage levels, solves the problems of reliable control and protection of high-voltage lines, and can expand the application scenarios.

[0077] In a preferred embodiment, in combination with Figure 1 and Figure 3, the closing drive circuit 104 includes: a first energy storage unit 1041, a first switch unit 1042, and a closing coil 1043. Among them, the first energy storage unit 1041, the first switch unit 1042, and the closing coil 1043 are connected in series to the closing drive circuit 104 in sequence.

[0078] The first energy storage unit 1041 is used for storing electric energy. When the first switch unit 1042 is in the conducting state, the electric energy stored in the first energy storage unit 1041 is released into the closing coil 1043 to generate the closing driving force for controlling the transmission module 103.

[0079] The opening drive circuit 105 includes: a second energy storage unit 1051, a second switch unit 1052, and an opening coil 1053. Among them, the second energy storage unit 1051, the second switch unit 1052, and the opening coil 1053 are connected in series to the opening drive circuit 105 in sequence.

[0080] The second energy storage unit 1051 is used for storing electric energy. When the second switch unit 1052 is in the conducting state, the electric energy stored in the second energy storage unit 1051 is released into the opening coil 1053 to generate the opening driving force for controlling the transmission module 103.

[0081] The following combines Figure 3 , and elaborates in detail on the working principles of the closing drive circuit 104 and the opening drive circuit 105. When the first vacuum interrupter 101 and the second vacuum interrupter 102 are in the closing operation state, the first energy storage unit 1041 will store electric energy. The following will specifically combine Figure 3 to elaborate on the detailed principles:

[0082] When the first vacuum interrupter 101 and the second vacuum interrupter 102 need to be closed, the first switch unit 1042 will receive the conduction instruction sent by the phase control module 108, and the second switch unit 1052 will receive the turn-off instruction sent by the phase control module. At this time, the discharge circuit of the closing drive circuit 104 will be conducted, and the discharge circuit of the opening drive circuit 105 will be turned off. The electric energy stored in the first energy storage unit 1041 will flow into the closing coil 1043 through the first switch unit 1042. The closing coil 1043 will generate an electromagnetic repulsive force to generate the closing driving force for controlling the transmission module 103, acting on the transmission module 103 to make the transmission module 103 execute the closing action, so that the first vacuum interrupter 101 and the second vacuum interrupter 102 are closed simultaneously.

[0083] When the first vacuum interrupter 101 and the second vacuum interrupter 102 need to be switched off, the second switch unit 1052 will receive the conduction instruction sent by the phase control module 108, and the first switch unit 1042 will receive the turn-off instruction sent by the phase control module 108. At this time, the discharge circuit of the opening drive circuit 105 will be turned on, and the discharge circuit of the closing drive circuit 104 will be turned off. The electric energy stored in the second energy storage unit 1051 will flow into the opening coil 1053 through the second switch unit 1052, and the opening coil 1053 will generate an electromagnetic repulsive force acting on the opening driving force for controlling the transmission module 103, acting on the transmission module 103, causing the transmission module 103 to perform an opening action, and causing the first vacuum interrupter 101 and the second vacuum interrupter 102 to be switched off simultaneously.

[0084] In addition, a first diode 1044 is provided in the closing drive circuit 104, and a second diode 1054 is provided in the opening drive circuit 105. Both the first diode 1044 and the second diode 1054 are used for current diversion.

[0085] In a preferred embodiment, in combination with Figure 1 and Figure 3 , the transmission module 103 includes: a scissor-type transmission device 1031, an insulating pull rod 1032, and a repulsive force mechanism transmission member 1033; wherein, the first end of the scissor-type transmission device 1031 is mechanically connected to the moving contact rod side of the first vacuum interrupter 101, the second end of the scissor-type transmission device 1031 is mechanically connected to the moving contact rod side of the second vacuum interrupter 102, and the third end of the scissor-type transmission device 1031 is mechanically connected to one end of the insulating pull rod 1032.

[0086] The other end of the insulating pull rod 1032 is mechanically connected to the repulsive force mechanism transmission member 1033, and the repulsive force mechanism transmission member 1033 is located between the closing coil 1043 and the opening coil 1053.

[0087] The insulating pull rod 1032 is subjected to the electromagnetic repulsive force generated by the closing coil 1043 and the opening coil 1053, and then pushes the transmission module 103 to perform a closing action or an opening action.

[0088] In a preferred embodiment, with reference to Figure 4 , Figure 4 is a schematic diagram of the installation positions of a contact spring and a bistable spring provided by an embodiment of the present application. In combination with Figure 3, the device further includes: a contact spring 110 and / or a bistable spring 111; wherein: the contact spring 110 is installed between the scissor drive device 1031 and the first vacuum interrupter 101, and between the scissor drive device 1031 and the second vacuum interrupter 102, for reducing the opening time of the first vacuum interrupter 101 and the second vacuum interrupter 102; the bistable spring 111 is installed on both sides of the rod body of the insulating pull rod 1032, for reducing the opening time of the first vacuum interrupter 101 and the second vacuum interrupter 102.

[0089] In this embodiment, to ensure that the interrupters of the double-break vacuum circuit breaker with integrated detection and energy supply have the required contact pressure, for the 40.5 kV double-break vacuum circuit breaker with integrated detection and energy supply, since its rated current is 2000 A and the rated short-circuit breaking current is 31.5 kV, a contact pressure of 3200 N is required to meet the contact pressure requirement of the circuit breaker. In this implementation, a series disc spring with a stiffness of 1066 N / m is used. When the over-travel is 3 mm, the requirement can be met. Since during closing, from a microscopic perspective, the contact surfaces of the two closing contacts are not in full contact, but once they are in contact, the scissor drive device 1031 will stop moving. At this time, the contact spring 110 or the bistable spring 111 is needed to continue applying spring pressure. Since the drive system is connected by rigid components, the scissor drive device 1031 can continue to perform the closing operation. While meeting the required contact pressure of the first vacuum interrupter 101 and the second vacuum interrupter 102, it can also significantly reduce the opening time of the first vacuum interrupter 101 and the second vacuum interrupter 102 in the open state.

[0090] In this embodiment, the contact spring 110 and the bistable spring 111 can be installed in the double-break vacuum circuit breaker with integrated detection and energy supply provided in this embodiment at the same time, or only one of the contact spring 110 or the bistable spring 111 can be installed, and the purpose of reducing the opening time can be achieved.

[0091] In a preferred embodiment, the rectification module 109 is a full-bridge rectification circuit or a half-bridge rectification circuit.

[0092] In this embodiment, in combination with Figure 3 , the rectification module 109 can be a full-bridge rectification circuit or a half-bridge rectification circuit. When the voltage on the first energy storage unit 1041 or the second energy storage unit 1051 is charged to the rated operating voltage, the rectification module 109 can disconnect the charging circuit and stop charging.

[0093] When it is detected that the capacitor voltage drops to the lower limit voltage for reliable operation, the rectifier module 109 closes the charging circuit and starts to supplement the voltage on the first energy storage unit 1041 or the second energy storage unit 1051; at the same time, the working mode of the rectifier module 109 can be to preferentially charge the second energy storage unit 1051 and then charge the first energy storage unit 1041.

[0094] In a preferred embodiment, the phase control module 108 stores at least one algorithm among a short-circuit fault rapid identification algorithm, a fault current zero-crossing prediction algorithm, and a capacitive or inductive load current zero-crossing prediction algorithm.

[0095] In this embodiment, referring to Figure 5 , Figure 5 is a schematic diagram of the opening current waveform of a short-circuit fault current with a long arcing time provided by an embodiment of the present application; the phase control module, based on the short-circuit fault identification algorithm and the fault current zero-crossing prediction algorithm, combines the opening time parameters of the double-break vacuum circuit breaker integrating detection and energy supply, and instructs it to perform the opening operation of the short-circuit fault with a shorter arcing time, thereby realizing the opening operation of the first vacuum interrupter 101 and the second vacuum interrupter 102.

[0096] Among them, for the short-circuit fault rapid identification algorithm, based on the accurate current measurement signal provided by the first current transformer 106, the method of wavelet transform or the method of current curvature can be used to process the current detection signal, and the short-circuit fault current can be rapidly identified by detecting the mutation information of the wavelet decomposition components; in this implementation scheme, the wavelet transform-based fault current rapid identification algorithm is specifically adopted, and using the wavelet packet dB4 decomposition component, the rapid identification of the short-circuit fault can be realized within 0.5±0.01 ms after the short-circuit fault occurs.

[0097] The fault current zero-crossing prediction algorithm utilizes a variable-window-length long short-term memory neural network combined with a Kalman filter and least squares method. The long short-term memory neural network algorithm can rapidly predict the zero point of short-circuit fault current under short-window conditions, but its accuracy is affected by the adequacy of model training. The Kalman filter and least squares method can accurately predict the zero-crossing point of fault current under medium- to long-window conditions. The fusion principle of each algorithm is as follows: when the long short-term memory network predicts that the time from the current zero-crossing point to the fault starting point is less than or equal to 7.5ms, the circuit breaker is difficult to open under this condition because the tripping time and short arc breaking time of the double-break vacuum circuit breaker with integrated detection and power supply require at least 4.5ms, and the zero-point prediction time is 3.0ms. In this case, the next zero point is predicted directly, and the window length is adjusted to obtain a more accurate zero-point prediction result. When the long short-term memory network predicts that the time from the current zero-crossing point to the fault starting point is greater than 7.5ms and less than or equal to 13ms, considering the prediction characteristics of the Kalman filter algorithm and the least squares method, the window length is adjusted to 6ms, and the Kalman filter algorithm is enabled. When the long short-term memory network predicts that the time from the current zero-crossing point to the fault starting point is greater than 13ms, the sampling window length is directly adjusted to 10ms, and the least squares method is enabled to accurately predict the fault current zero point.

[0098] Reference Figure 6 , Figure 6 It is a schematic diagram of a short-circuit fault current long arcing time breaking current waveform provided in an embodiment of the present application. When the double-break vacuum circuit breaker with integrated detection and energy supply performs the disconnection of a capacitive or inductive load, in order to ensure that the contact gap has a high insulation strength after the circuit breaker disconnects the load current, the phase-controlled control module 108 judges the zero-crossing point of the load current based on the load current signal detected by the second mutual inductor 107, and combines the opening time parameter of the double-break vacuum circuit breaker with integrated detection and energy supply to instruct it to perform the capacitive or inductive load current disconnection operation with a longer arcing time, thereby realizing the disconnection operation of the first vacuum interrupter 101 and the second vacuum interrupter 102.

[0099] The capacitive or inductive load current zero-point prediction algorithm can utilize a frequency calculation method to obtain the real-time frequency characteristics of the load current and predict the subsequent zero-crossing points of each circuit. Furthermore, the capacitive or inductive load current zero-point prediction can also be implemented using a hardware comparison circuit within the phase control module 108. In this specific embodiment, a software algorithm is employed to identify the frequency of the load current at each power frequency cycle under normal operating conditions.

[0100] Since the switching of capacitive or inductive loads does not require the same rapidity as the short-circuit fault current zero point detection, there are no high requirements for the circuit breaker opening time, so accurate prediction of the load current zero point can be achieved.

[0101] Through the above algorithm, when a circuit breaker is required, the circuit breaker can be tripped faster or more reliably. The ground potential of the internal control circuit board of the phase control module 108 adopts a floating potential, which can avoid the second current transformer 107 from inducing a high voltage, resulting in insulation breakdown and damage of the phase control module 108 due to a high potential difference.

[0102] In a preferred embodiment, the installation position of the first current transformer 106 is any one of the insulating housing side, the static conductive end side, and the moving conductive rod side of the first vacuum interrupter 101;

[0103] The installation position of the second current transformer 107 is any one of the insulating housing side, the static conductive end side, and the moving conductive rod side of the second vacuum interrupter 102.

[0104] In this embodiment, refer to Figure 7 , Figure 7 FIG. is a schematic diagram of the installation position of a current transformer provided by an embodiment of the present application. Each vacuum interrupter includes: an insulating housing side, a static conductive end side, and a moving conductive rod side. It can be seen from the figure that 1061, 1062, and 1063 are different installation positions of the first current transformer 106, and the socket installation positions are the moving conductive rod side, the insulating housing side, and the static conductive end side of the first vacuum interrupter 101 respectively; 1071, 1072, and 1073 are different installation positions of the second current transformer 107, and the socket installation positions are the moving conductive rod side, the insulating housing side, and the static conductive end side of the second vacuum interrupter 102 respectively.

[0105] In addition, the installation positions of the first current transformer 106 and the second current transformer 107 do not affect each other. According to needs, the positions of the first current transformer 106 and the second current transformer 107 can also be interchanged, as long as they do not directly contact each other. The first current transformer 106 can also be installed on the moving conductive rod side of the first vacuum interrupter 101, and the second current transformer 107 can be installed on the static conductive end side of the first vacuum interrupter 101. This embodiment does not make any limitations.

[0106] In a preferred embodiment, the first current transformer 106 is an energy-supplying current transformer, and the second current transformer 107 is a current-detecting current transformer.

[0107] In this embodiment, the first current transformer 106 adopts an energy-supplying current transformer with an oxygen-free copper winding and fewer turns, ensuring that the first current transformer 106 can provide a sufficiently high charging power under the normal closed operation state of the integrated detection and energy-supplying double-break vacuum circuit breaker device.

[0108] The second current transformer 107 can adopt a detection current transformer for an oxygen-free copper winding measurement to ensure that the current detection signal transmitted to the phase control module 108 has a high accuracy. The first current transformer 106 and the second current transformer 107 can achieve the insulation and sealing of the current transformer coil through the method of vacuum epoxy casting.

[0109] In addition, in this embodiment, the potentials on the internal electronic circuit boards of the rectification module 109 and the phase control module 108 adopt floating potentials, which can avoid the first current transformer 106 and the second current transformer 107 from inducing high voltages, resulting in insulation breakdown and damage of the rectification module 109 and the phase control module 108 due to high potential differences.

[0110] In a preferred embodiment, the first switching unit 1042 and the second switching unit 1052 are at least one of electronic switching devices such as controllable thyristors, insulated gate bipolar transistors, and insulated gate controlled thyristors.

[0111] In this embodiment, combined with Figure 3 , since the first energy storage unit 1041 and the second energy storage unit 1051 use capacitors for storage, assuming a capacitor of 4 mF and the number of turns of the closing and opening coils is 30 turns, when the first charging voltage is 800 V, the peak value of the discharge current can reach 15 kA. Then, a controllable thyristor with a rated parameter of 20 kA is adopted, and the selection of insulated gate bipolar transistors and insulated gate controlled thyristors can be selected according to the actual situation, which is not limited in this embodiment.

[0112] Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0113] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the devices according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of the processes and / or blocks in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal devices generate a device for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0114] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0115] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, apparatus, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, apparatus, article or terminal device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, apparatus, article or terminal device comprising the element.

[0116] The above provides a detailed introduction to a double-break vacuum circuit breaker device provided by the present invention. Specific examples are used in this text to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the device of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A double-break vacuum circuit breaker device, characterized in that, The device includes: a first vacuum interrupter and a second vacuum interrupter, and a drive module respectively connected to the first vacuum interrupter and the second vacuum interrupter, where the drive module is used to control the closing and opening of the first vacuum interrupter and the second vacuum interrupter; Wherein, the device further includes: A closing drive circuit, configured to output a closing driving force to the drive module to control the closing of the first vacuum interrupter and the second vacuum interrupter; An opening drive circuit, configured to output an opening driving force to the drive module to control the opening of the first vacuum interrupter and the second vacuum interrupter; A first current transformer, connected to the first vacuum interrupter, and configured to sense the current flowing through the first vacuum interrupter when the first vacuum interrupter and the second vacuum interrupter are closed; wherein, the current output terminal of the first current transformer is electrically connected to the input terminals of the closing drive circuit and the opening drive circuit respectively, and is configured to output the sensed current to the closing drive circuit and the opening drive circuit for electrical energy storage; A second current transformer, connected to the second vacuum interrupter, and configured to detect the current flowing through the second vacuum interrupter; A phase control module, the input terminal of the phase control module is electrically connected to the second current transformer, and the output terminal is respectively connected to the control terminals of the closing drive circuit and the opening drive circuit, and is configured to control the closing drive circuit to stop outputting the closing driving force to the drive module and control the opening drive circuit to start outputting the opening driving force to the drive module when the current flowing through the second vacuum interrupter exceeds a preset current; A rectification module, the input terminal of the rectification module is electrically connected to the first current transformer, and the output terminal is respectively electrically connected to the input terminals of the closing drive circuit and the opening drive circuit; The rectification module is configured to rectify the current sensed by the first current transformer and then output it to the closing drive circuit and the opening drive circuit for electrical energy storage.

2. The device according to claim 1, characterized in that The closing drive circuit includes: a first energy storage unit, a first switch unit and a closing coil, wherein the first energy storage unit, the first switch unit and the closing coil are sequentially connected in series to the closing drive circuit; The first energy storage unit is used for electrical energy storage, and when the first switch unit is in a conducting state, the electrical energy stored in the first energy storage unit is released into the closing coil to generate the closing driving force for controlling the drive module; The opening drive circuit includes: a second energy storage unit, a second switch unit and an opening coil; wherein the second energy storage unit, the second switch unit and the opening coil are sequentially connected in series to the opening drive circuit; The second energy storage unit is used for electrical energy storage, and when the second switch unit is in a conducting state, the electrical energy stored in the second energy storage unit is released into the opening coil to generate the opening driving force for controlling the drive module.

3. The device according to claim 2, wherein The drive module includes: a scissor-type drive device, an insulating pull rod and a repulsive mechanism drive member; wherein, The first end of the scissor-type transmission device is mechanically connected to the moving conducting rod side of the first vacuum interrupter, the second end of the scissor-type transmission device is mechanically connected to the moving conducting rod side of the second vacuum interrupter, and the third end of the scissor-type transmission device is mechanically connected to one end of the insulating pull rod; The other end of the insulating pull rod is mechanically connected to the repulsive force mechanism transmission member, and the repulsive force mechanism transmission member is located between the closing coil and the opening coil.

4. The device according to claim 3, characterized in that The device further includes: a contact spring and / or a bistable spring; wherein: The contact spring is installed between the scissor-type transmission device and the first vacuum interrupter, and between the scissor-type transmission device and the second vacuum interrupter, for reducing the opening time of the first vacuum interrupter and the second vacuum interrupter; The bistable spring is installed on both sides of the rod body of the insulating pull rod, for reducing the opening time of the first vacuum interrupter and the second vacuum interrupter.

5. The device according to claim 1, characterized in that, The rectification module is a full-bridge rectification circuit or a half-bridge rectification circuit.

6. The device according to claim 1, characterized in that, The phase control module stores at least one algorithm among a short-circuit fault rapid identification algorithm, a fault current zero-crossing prediction algorithm, and a capacitive or inductive load current zero-crossing prediction algorithm.

7. The device according to claim 3, characterized in that, The installation position of the first current transformer is any one of the insulating outer shell side, the static conducting end side, and the moving conducting rod side of the first vacuum interrupter; The installation position of the second current transformer is any one of the insulating outer shell side, the static conducting end side, and the moving conducting rod side of the second vacuum interrupter.

8. The device according to claim 1, characterized in that The first current transformer is an energy-supplying current transformer, and the second current transformer is a detection current transformer.

9. The device according to claim 2, characterized in that, The first switching unit and the second switching unit are respectively at least one electronic switching device among a controllable thyristor, an insulated gate bipolar transistor, and an insulated gate controlled thyristor.

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