Multi-break high voltage circuit breaker, control method, device and electronic equipment

Abstract

The application provides a multi-break high-voltage circuit breaker, a control method and device, and electronic equipment. The circuit breaker comprises a switch, a current transformer, a voltage transformer, and a controller. The switch has multiple switch breaks and is electrically cascaded with each other. The current transformer is arranged adjacent to the switch and is used to collect current information. The voltage transformer is arranged adjacent to the switch and the current transformer and is used to collect voltage information. The controller comprises an A / D conversion unit, a control unit, and a control interface. The A / D conversion unit converts the current information and the voltage information into digital quantity information. The control unit receives an action signal of an external protection control device and receives the digital quantity information of the A / D conversion unit. The control interface receives a control signal sent by the control unit and controls the multiple switch breaks to separately perform opening and closing actions. According to the technical scheme, the switch breaks at the high-voltage end have a larger insulation opening distance, so that high-voltage breaking can be realized without connecting a voltage-sharing capacitor or a capacitor with a small capacitance in parallel on each switch break.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-voltage switches, in particular to a multi-break high-voltage circuit breaker, a control method and device, and an electronic device. BACKGROUND

[0002] With the continuous improvement of the voltage level of the power grid in China, many AC circuit breakers use multiple breakers in series to improve the insulation capacity and reduce the on-off time. In DC circuit breakers, multiple breakers are also used in series, with a maximum of 10 switch breakers in series.

[0003] Although the circuit breaker with multiple switch breakers in series can meet the high-voltage insulation requirements, shorten the stroke of each switch breaker, and reduce the mechanical action time, it also brings the problem of inconsistent voltage distribution between the breakers. Due to the existence of the parasitic capacitance to ground of each switch breaker, the switch breaker at the high-voltage end will bear the maximum voltage, and the switch breaker at the low-voltage end will bear the minimum voltage. This uneven voltage distribution can easily cause the switch breaker at the high-voltage end to break down first, and then cause avalanche breakdown of the subsequent multiple switch breakers, resulting in failure of the entire circuit breaker to open.

[0004] To solve the above problem, a measure of connecting a voltage-sharing capacitor in parallel with each breaker is usually used to reduce uneven voltage distribution. The capacitance value of the parallel voltage-sharing capacitor directly determines the consistency of the voltage distribution. The larger the capacitance value, the better the voltage sharing, but the larger the capacitance value not only increases the cost and size, but also seriously affects the arc extinction and insulation recovery capability of the switch breaker, reducing the breaking capacity of the circuit breaker to handle short-circuit current.

[0005] The above information disclosed in the background section is only used to enhance the understanding of the background of the present application, and therefore it can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] The present application provides a multi-break high-voltage circuit breaker, a control method and device, and an electronic device, which can distinguish the direction of short-circuit fault occurrence, and by setting a delay opening breaker, the switch breaker at the high-voltage end has a larger insulation distance, so that high-voltage opening can be achieved without connecting a voltage-sharing capacitor or a capacitor with a smaller capacitance value in parallel with each switch breaker.

[0007] The features and advantages of the technical solutions of the present application will become apparent from the following detailed description, or will be learned partly by practice of the present application.

[0008] According to an aspect of the present application, a multi-break high-voltage circuit breaker is provided, comprising: a switch having a plurality of switch breaks and being electrically cascaded with each other; a current transformer disposed adjacent to the switch and configured to collect current information; a voltage transformer disposed adjacent to the switch and the current transformer and configured to collect voltage information; and a controller comprising: an A / D conversion unit configured to convert the current information and the voltage information into digital information; a control unit configured to receive an action signal of an external protection control device and the digital information of the A / D conversion unit; and a control interface configured to receive a control signal sent by the control unit and control the plurality of switch breaks to individually perform opening and closing actions.

[0009] According to some embodiments, the control interface is connected with operating mechanisms of the plurality of switch breaks.

[0010] According to some embodiments, the control unit comprises a field programmable gate array (FPGA) chip, a complex programmable logic device (CPLD), or a digital signal processing programmable device (DSP).

[0011] According to another aspect of the present application, a control method of a multi-break high-voltage circuit breaker is provided, the multi-break high-voltage circuit breaker comprising a switch having a plurality of switch breaks, the control method comprising: collecting current signals and voltage signals on the same side of the switch; determining electrical signal characteristic values according to the current signals and the voltage signals; comparing the electrical signal characteristic values with reference characteristic values to determine a positional relationship of a short-circuit fault occurrence position relative to the switch; and sequentially delaying the plurality of switch breaks to be opened from a farthest end of the switch from the short-circuit fault occurrence position according to the positional relationship.

[0012] According to some embodiments, before the electrical signal characteristic values are determined according to the current signals and the voltage signals, the method further comprises: converting the current signals and the voltage signals into current digital signals and voltage digital signals. According to some embodiments, the electrical signal characteristic values comprise a phase angle between the current signals and the voltage signals.

[0013] According to some embodiments, the electrical signal reference characteristic values comprise a phase angle between the current signals and the voltage signals.

[0014] According to some embodiments, the time of the sequential delay is in the order of milliseconds.

[0015] According to some embodiments, the interval time of the sequential delay is not completely the same.

[0016] According to another aspect of the present application, a control device for multi-break high-voltage circuit breaking is provided, comprising: a collection module configured to collect current signals and voltage signals on the same side of a switch; an extraction module configured to determine electrical signal characteristic values based on the current signals and the voltage signals; a confirmation module configured to compare the electrical signal characteristic values with reference characteristic values to determine a positional relationship of a short-circuit fault occurrence position relative to the switch; and an execution module configured to, based on the positional relationship, sequentially delay the disconnection of multiple switch breaks starting from the most distal end of the switch from the short-circuit fault occurrence position.

[0017] According to an aspect of the present application, an electronic device is provided, comprising: one or more processors; a storage device configured to store one or more programs; and when the one or more programs are executed by the one or more processors, the one or more processors implement the method as described above.

[0018] According to the technical solution of the present application, high-voltage breaking is achieved through the series connection of multiple breaks, and a current transformer, a voltage transformer, and a controller are provided, which can first distinguish the direction of short-circuit fault occurrence, and then issue instructions through the control interface of the controller to first open the high-voltage end break distal to the fault direction, and then sequentially delay the opening of the breaks in the direction from high voltage to low voltage, thereby ensuring that the switch breaks at the high-voltage end have a larger insulation distance, so that high-voltage breaking can be achieved without the need for parallel connection of voltage-sharing capacitors or parallel connection of capacitors with small capacitance values on each switch break.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings without departing from the scope of the present application.

[0021] Figure 1 A schematic diagram of a multi-break high-voltage circuit breaker according to an exemplary embodiment is shown;

[0022] Figure 2 A flowchart of a control method for a multi-break high-voltage circuit breaker according to an exemplary embodiment is shown;

[0023] Figure 3 A schematic diagram of the action of a multi-break high-voltage circuit breaker according to an exemplary embodiment is shown;

[0024] Figure 4 A schematic diagram of the action of a multi-break high-voltage circuit breaker according to an exemplary embodiment is shown;

[0025] Figure 5 A block diagram of a control device of a multi-break high voltage circuit breaker according to an example embodiment is shown.

[0026] Figure 6 An electronic device block diagram of a control device of a multi-break high voltage circuit breaker according to an example embodiment is shown. DETAILED DESCRIPTION

[0027] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the several views.

[0028] The described features, structures, or characteristics can be combined in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the technology can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In these instances, well-known structures, methods, devices, implementations, materials, and operations are not shown or described in detail.

[0029] In addition, the terms "comprise / comprising" and "include / including" when used in this specification and in the following claims are intended to specify the presence of stated features, integers, steps, components, or sections but do not preclude the presence or addition of one or more other features, integers, steps, components, sections, articles, materials, or groups thereof.

[0030] The terms "first", "second", and the like, herein do not necessarily denote any ordinal, chronological or spatial relationship. Further, the terms "comprises", "comprising", "includes", "including" and the like, are inclusive of the terms "consisting of" and "consisting essentially of".

[0031] Many AC circuit breakers use multiple break series to improve the insulation capability, while reducing the on-off time. In DC circuit breakers, multiple break series is also used, up to 10 switch breaks in series.

[0032] Although the circuit breaker with multiple switch gaps in series can meet the high voltage insulation requirements, shorten the stroke of each switch gap and reduce the mechanical action time, it also brings the problem of inconsistent voltage distribution between the gaps. Due to the existence of the parasitic capacitance to ground in each switch gap, the switch gap at the high voltage end bears the maximum voltage and the switch gap at the low voltage end bears the minimum voltage. This uneven voltage distribution easily causes the switch gap at the high voltage end to break down first, and then causes the avalanche breakdown of the subsequent multiple switch gaps, and finally the entire circuit breaker fails to break.

[0033] Figure 1 A schematic diagram of a multi-gap high-voltage circuit breaker according to an exemplary embodiment is shown.

[0034] As shown in Figure 1 The multi-gap high-voltage circuit breaker 100 includes a switch 101 with multiple switch gaps and electrically cascaded with each other, a current transformer 103 disposed adjacent to the switch 101 for collecting current information, a voltage transformer 104 disposed adjacent to the switch 101 and the current transformer 103 for collecting voltage information, and a controller 102 including an A / D conversion unit 1021 for converting the current information and the voltage information into digital quantity information, a control unit 1022 for receiving an action signal of an external protection control device 105 and receiving the digital quantity information of the A / D conversion unit 1021, and a control interface 1023 for receiving a control signal sent by the control unit 1022 to control the multiple switch gaps to separately perform opening and closing actions, and the control interface 1023 is connected with the operating mechanisms of the multiple switch gaps.

[0035] According to the embodiment, the switch 101 includes N switch gaps, N is greater than or equal to 2, and the N switch gaps are connected in series with each other to achieve high voltage expansion.

[0036] The current transformer 103 and the voltage transformer 104 are connected with the A / D conversion unit 1021 of the controller 102 to send the collected analog electrical signals to the A / D conversion unit 1021.

[0037] The control unit 1022 of the controller 102 receives the action signal of the external protection control device 105 and also receives the digital signals of the current and voltage from the A / D conversion unit 1021, and is connected with the control interface 1023 of the controller 102 to send the action instructions of the N gaps to the corresponding N switch gaps of the switch 101.

[0038] The control interface 1023 of the controller 102 is connected with the N switch gaps respectively to send the action instructions to each switch gap and receive the state information of the switch gap, and send the state information to the control unit 1022 of the controller 102.

[0039] The control unit 1022 can also be a field programmable gate array chip (FPGA), a complex programmable logic device (CPLD), or a digital signal processing programmable device (DSP), and the present application is not limited thereto.

[0040] Figure 2 A flowchart of a multi-break high-voltage circuit breaker control method according to an example embodiment is shown.

[0041] Referring to Figure 2 First, according to the embodiment, the current transformer 103 and the voltage transformer 104 collect analog electric signals of current and voltage, and send the analog electric signals to the A / D conversion unit 1021 of the controller 102 at S201.

[0042] At S203, the A / D conversion unit 1021 of the controller 102 processes the collected current and voltage analog electric signals into digital signals, and sends the digital signals to the control unit 1022 of the controller 102.

[0043] At S205, the control unit 1022 detects and stores the reference characteristic value of current and voltage, i.e., the phase angle, under normal conditions, and the reference characteristic value can also be other parameters different from the phase angle, and detects the characteristic value of current and voltage, i.e., the phase angle, under short-circuit fault conditions, and judges the short-circuit fault occurrence position by comparing the characteristic value under normal conditions with the characteristic value under short-circuit fault conditions, i.e., by comparing the angles.

[0044] At S207, the control unit 1022 of the controller 102 receives the tripping action instruction of the external control protection device 105, and according to the short-circuit fault occurrence direction judged at S205, the conditions of S207 and S209 are satisfied at the same time through S209, and enters S210 to send the high-voltage end break tripping instruction away from the short-circuit fault position to the control interface 1023 of the controller 102, and then delays for Δt time and sends the tripping instruction to each switch break in turn from the high-voltage end away from the short-circuit fault position.

[0045] According to the above embodiment, the short-circuit fault occurrence position is judged, i.e., the direction of short-circuit fault occurrence is first distinguished, and then the controller is used to open the high-voltage end break far from the fault direction, and then the breaks are opened in turn from high voltage to low voltage after a certain time delay, so that the switch breaks at the high-voltage end have a larger insulation opening distance.

[0046] Figure 3 A schematic diagram of the action of a multi-break high-voltage circuit breaker according to an example embodiment is shown.

[0047] As Figure 3As shown, according to the example embodiment, when the short-circuit fault 300 occurs in the right direction of the high-voltage switch 101, the current transformer 103 and the voltage transformer 104 collect the short-circuit fault signal and send it to the A / D conversion unit 1021 of the controller 102; the A / D conversion unit 1021 of the controller 102 sends the converted signal to the control unit 1022 of the controller 102.

[0048] The control unit 1022 of the controller 102 calculates the phase angle of the current and voltage signals during the fault and compares it with the phase angle in the normal system; at this time, since the short-circuit fault occurs in the positive direction of the current, the phase angle of the current and voltage in the normal system does not change, so it can be determined that the fault is in the positive direction of the high-voltage circuit breaker.

[0049] The control unit 1022 of the controller 102 sends the opening command of the first switch gap 1011 through the control interface 1023, and then sends the opening command of the second switch gap 1012 to the Nth switch gap 101N after a delay of Δt1, the delay interval between the switch gaps 1012 to 101N is Δt2, and the delay intervals between the switch gaps 1012 to 101N can be different.

[0050] Figure 4 A schematic diagram of the action of a multi-gap high-voltage circuit breaker according to an example embodiment is shown.

[0051] As Figure 4 As shown, according to the example embodiment, when the short-circuit fault 400 occurs in the left direction of the high-voltage switch 101, the current transformer 103 and the voltage transformer 104 collect the short-circuit fault signal and send it to the A / D conversion unit 1021 of the controller 102, and the A / D conversion unit 1021 of the controller 102 sends the converted signal to the control unit 1022 of the controller 102.

[0052] The control unit 1022 of the controller 102 calculates the phase angle of the current and voltage signals during the fault and compares it with the phase angle in the normal system; at this time, since the short-circuit fault occurs in the positive direction of the current, the phase angle of the current and voltage in the normal system does not change, so it can be determined that the fault is in the positive direction of the high-voltage circuit breaker.

[0053] The control unit 1022 of the controller 102 sends the opening command of the Nth switch gap 101N through the control interface 1023, and then successively sends the opening commands of the (N-1)th switch gap 101N-1 to the first switch gap 1011 after a delay Δt1. The delay intervals between the switch gaps 101N-1 to 1011 are Δt2, and the delay intervals between the switch gaps 101N-1 to 1011 can be different from each other.

[0054] In the above embodiment, the delay Δt1 is a number greater than 0, and the delay Δt2 is a number greater than or equal to 0, both of which are usually several milliseconds.

[0055] Figure 5 A module diagram of the control device of the multi-gap high-voltage circuit breaker according to an example embodiment is shown.

[0056] Referring to Figure 5 , according to an embodiment, a control device 500 of a multi-gap high-voltage circuit breaker includes: an acquisition module 501, an extraction module 503, a confirmation module 505, and an execution module 507.

[0057] The acquisition module 501 can be configured to acquire the current signal and the voltage signal on the same side of the switch.

[0058] The extraction module 503 can be configured to determine the electrical signal characteristic value according to the current signal and the voltage signal.

[0059] The confirmation module 505 can be configured to compare the electrical signal characteristic value with the reference characteristic value to determine the positional relationship of the short-circuit fault occurrence position relative to the switch.

[0060] The execution module 507 can be configured to, according to the positional relationship, sequentially delay the disconnection of the plurality of switch gaps from the farthest end of the switch from the short-circuit fault occurrence position.

[0061] The device performs similar functions to the method provided above, and other functions can be referred to the description above, which will not be repeated here.

[0062] Figure 6 An electronic device block diagram of the control device of the multi-gap high-voltage circuit breaker according to an example embodiment is shown.

[0063] As shown in Figure 6 , the electronic device 600 is in the form of a general computing device. The components of the electronic device 600 can include, but are not limited to: at least one processing unit 610, at least one storage unit 620, a bus 630 connecting different system components (including the storage unit 620 and the processing unit 610), a display unit 640, etc.

[0064] The storage unit stores program codes, which can be executed by the processing unit 610, so that the processing unit 610 performs the methods according to various exemplary embodiments of the present application described in the specification.

[0065] The bus 630 can represent one or more of several types of bus structures, including an external bus or bus controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of a variety of bus structures.

[0066] The electronic device 600 can also communicate with one or more external devices 700 such as a keyboard or pointing devices, a Bluetooth device, etc.; other devices that enable a user to interact with the electronic device 600; and / or any devices (e.g., a router, a modem, a switch, etc.) that enable the electronic device 600 to communicate with one or more other computing devices. Such communication can occur via an input / output (I / O) interface 650. Still yet, the electronic device 600 can communicate with one or more networks, such as a local area network (LAN), a general wide area network (WAN), and / or the public network, such as the Internet, via a network adapter 660. The network adapter 660 can be communicatively coupled to the other components of the electronic device 600 via the bus 630. It should be appreciated that the electronic device 600 can be a part of another device or be a stand-alone device, and can be implemented as a wired or wireless device. In addition, the electronic device 600 can be a personal computer (PC), a tablet PC, a personal digital assistant (PDA), a cellular telephone, a web appliance, a network router, switch or bridge, or any other device that is capable of communicating with another device over a network or the like. The electronic device 600 can be a server, a desktop computer, a laptop computer, a tablet computer, a netbook computer, a smart phone, an on-board computer, an off-board computer, an application-specific computer, or any other suitable device, and can have one or more of these and / or other devices.

[0067] The technical scheme provided by the embodiment of the present application realizes high-voltage breaking through a plurality of break points in series, and sets current and voltage sampling and a controller, so that the position of a short-circuit fault can be distinguished first, then the high-voltage end break point far from the fault position is opened, and the break points are opened one by one from high voltage to low voltage after a certain time delay, so that the switch break point of the high-voltage end has a larger insulation opening distance, and thus high-voltage breaking can be realized without parallel connection of voltage-sharing capacitors or parallel connection of capacitors with small capacitance values on each switch break point.

[0068] The above describes the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method and core idea of the present application. Meanwhile, the changes or deformations made by the person skilled in the art according to the idea of the present application, based on the specific implementation manners and application range of the present application, all belong to the protection range of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A control method for a multi-break high-voltage circuit breaker, wherein the multi-break high-voltage circuit breaker comprises a switch having multiple switching breaks, the multiple switching breaks being electrically cascaded with each other, characterized in that, include: Collect current and voltage signals from the same side of the switch; An electrical signal characteristic value is determined based on the current signal and the voltage signal, wherein the electrical signal characteristic value includes the phase angle between the current signal and the voltage signal; The positional relationship between the short-circuit fault location and the switch is determined by comparing the electrical signal characteristic value with a reference characteristic value, including: If the electrical signal characteristic value is consistent with the reference characteristic value, the location of the short circuit fault is determined to be on the positive current direction side of the switch; When the electrical signal characteristic value differs from the reference characteristic value by 180 degrees, the location of the short circuit fault is determined to be on the side of the switch opposite to the current direction. Based on the positional relationship, starting from the farthest point of the switch from the location of the short-circuit fault, the multiple switch contacts are sequentially delayed until they are disconnected.

2. The control method according to claim 1, characterized in that, Before determining the electrical signal characteristic values ​​based on the current signal and the voltage signal, the process further includes: The current signal and the voltage signal are converted into digital current signals and digital voltage signals.

3. The control method according to claim 1, characterized in that, The reference characteristic value is the phase angle between the current signal and the voltage signal under normal conditions.

4. The control method according to claim 1, characterized in that, The sequential delay time is in milliseconds.

5. The control method according to claim 1, characterized in that, The intervals between the successive delays are not entirely the same.

6. A control device for a multi-break high-voltage circuit breaker, the multi-break high-voltage circuit breaker comprising a switch having multiple switching breaks, the multiple switching breaks being electrically cascaded together, characterized in that, include: The acquisition module is used to acquire current and voltage signals from the same side of the switch; The extraction module is used to determine electrical signal feature values ​​based on current signals and voltage signals, wherein the electrical signal feature values ​​include the phase angle between the current signals and the voltage signals; The confirmation module compares the electrical signal characteristic values ​​with reference characteristic values ​​to determine the positional relationship between the short-circuit fault location and the switch, including: If the electrical signal characteristic value is consistent with the reference characteristic value, the location of the short circuit fault is determined to be on the positive current direction side of the switch; When the electrical signal characteristic value differs from the reference characteristic value by 180 degrees, the location of the short circuit fault is determined to be on the side of the switch opposite to the current direction. The execution module is used to, based on the positional relationship, sequentially delay and disconnect the plurality of switch contacts, starting from the farthest point of the switch from the location of the short-circuit fault.

7. An electronic device, characterized in that, include: One or more processors; Storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in any one of claims 1-5.

8. A multi-break high-voltage circuit breaker, characterized in that, The multi-break high-voltage circuit breaker is used to perform the method according to any one of claims 1-5, and the multi-break high-voltage circuit breaker comprises: A switch having multiple switching contacts that are electrically cascaded together; A current transformer, located adjacent to the switch, is used to collect current information; A voltage transformer, disposed adjacent to the switch and the current transformer, collects voltage information; and The controller includes: The A / D conversion unit converts the current information and the voltage information into digital information. The control unit receives the action signals from the external protection control device, and simultaneously receives the digital information from the A / D conversion unit; The control interface receives control signals from the control unit and controls the multiple switch contacts to perform individual opening and closing actions.

9. The multi-break high-voltage circuit breaker according to claim 8, characterized in that, The control interface is connected to the operating mechanism of the plurality of switch contacts.

10. The multi-break high-voltage circuit breaker according to claim 8, characterized in that, The control unit includes: a field-programmable gate array (FPGA), a complex programmable logic device (CPLD), or a digital signal processing programmable device (DSP).

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