Fault processing device and method compatible with arc suppression coil operation

Abstract

The invention provides a fault processing device and method compatible with arc suppression coil operation, and relates to the technical field of power supply equipment, the device comprises an arc suppression coil module and an intelligent grounding module, and the arc suppression coil module and the intelligent grounding module are connected in parallel; the arc suppression coil module comprises a first front circuit breaker, a first grounding transformer, an arc suppression coil and a first current limiting resistor, the wire inlet end of the first front circuit breaker is connected with a bus of the power distribution system, the output line of the first front circuit breaker is connected with the wire inlet end of the first grounding transformer, and the neutral point of the first grounding transformer is connected with one end of the arc suppression coil. The other end of the arc suppression coil is connected with a current-limiting resistor I, and the other end of the current-limiting resistor I is grounded; the intelligent grounding module comprises a front circuit breaker II, a fault phase selection sub-module and a fault line selection sub-module, a bus of the power distribution system is connected with a wire inlet end of the front circuit breaker II, the fault phase selection sub-module is connected with the front circuit breaker II in series and then is grounded, and the fault line selection sub-module is connected with the fault phase selection sub-module in parallel.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply equipment, and in particular to a fault handling device and method compatible with arc suppression coil operation. Background Art

[0002] With the continuous development of society and the continuous increase in electricity demand, the demand for power supply safety and reliability is also getting higher and higher. Among them, the switch-type arc extinguishing equipment determines the single-phase grounding fault by the magnitude of the fault phase, non-fault phase and zero-sequence voltage, and directly realizes metallic grounding of the fault phase in the equipment, so that the voltage of the fault phase to the ground drops to zero, or the arc at the original fault point is extinguished by grounding the arc extinguishing coil, avoiding the generation of arc overvoltage, while the voltage of the other two phases to the ground is limited to the level of the line voltage, ensuring the safe and reliable operation of the power grid.

[0003] However, in the process of metallic grounding of the fault phase or grounding the fault phase through a small resistor, a period of judgment and processing is still required in the process of dealing with instantaneous faults, which reduces the processing speed of arc extinguishing of grounding faults. The long-term operation of arc extinguishing coils in high-current lines may also make the insulation of the cable line unrecoverable, reduce the arc extinguishing effect, and pose a safety hazard. Summary of the invention

[0004] In order to speed up the arc extinguishing process when a single-phase ground short circuit fault occurs, the present application provides a fault handling device and method that are compatible with the operation of an arc extinguishing coil.

[0005] In a first aspect, the present application provides a fault handling device compatible with arc suppression coil operation, which adopts the following technical solution: A fault handling device compatible with arc suppression coil operation, the device comprising an arc suppression coil module and an intelligent grounding module, the arc suppression coil module and the intelligent grounding module being connected in parallel; The arc suppression coil module includes a pre-circuit breaker 1, a grounding transformer 1, an arc suppression coil and a current limiting resistor 1, the inlet end of the pre-circuit breaker 1 is connected to the busbar of the power distribution system, the output line of the pre-circuit breaker 1 is connected to the inlet end of the grounding transformer 1, the neutral point of the grounding transformer 1 is connected to one end of the arc suppression coil, the other end of the arc suppression coil is connected to the current limiting resistor 1, and the other end of the current limiting resistor 1 is grounded; The intelligent grounding module includes a front circuit breaker 2, a fault phase selection submodule and a fault line selection submodule. The busbar of the power distribution system is connected to the incoming line terminal of the front circuit breaker 2. The fault phase selection submodule is connected in series with the front circuit breaker 2 and then grounded. The fault line selection submodule is connected in parallel with the fault phase selection submodule.

[0006] Optionally, the fault phase selection submodule includes an arc-extinguishing phase-splitting circuit breaker, a second current-limiting resistor and an arc-extinguishing switch, wherein the input ends of multiple phase-splitting switches in the arc-extinguishing phase-splitting circuit breaker are respectively connected to the multi-phase output lines of the second pre-circuit breaker, one end of the second current-limiting resistor is simultaneously connected to the output ends of multiple phase-splitting switches, the other end of the second current-limiting resistor is grounded, and the arc-extinguishing switch is connected in parallel to the second current-limiting resistor; A first current transformer is installed on the common grounding circuit of the second current limiting resistor and the arc extinguishing switch.

[0007] Optionally, the fault line selection submodule includes a three-phase contactor and a grounding transformer 2 with impedance, the three-phase input ends of the three-phase contactor are respectively connected to the three-phase output lines of the pre-circuit breaker 2, the output ends of the three-phase contactor are connected to the three-phase input ends of the grounding transformer 2, and the neutral point of the grounding transformer 2 is grounded; A second current transformer is installed on the grounding line of the second grounding transformer.

[0008] Optionally, the device further comprises a main controller, an input end of the main controller receives current monitoring information fed back by the first current transformer and the second current transformer; The multiple control ends of the main controller are respectively connected to the control end of the pre-circuit breaker 1, the control end of the pre-circuit breaker 2, the control end of the arc-extinguishing phase-split circuit breaker, the control end of the arc-extinguishing switch and the control end of the three-phase contactor, so as to control the opening and closing of the pre-circuit breaker 1, the pre-circuit breaker 2, the arc-extinguishing phase-split circuit breaker, the arc-extinguishing switch and the three-phase contactor according to the current monitoring information.

[0009] In the second aspect, the present application provides a fault handling method compatible with arc suppression coil operation, which adopts the following technical solution: A method for handling a fault compatible with arc extinguishing coil operation is applied to the device for handling a fault compatible with arc extinguishing coil operation according to the first aspect, the method comprising: Acquire phase current value information of the bus three-phase line on the power distribution system in real time, and identify the operating status of the bus three-phase line according to a plurality of phase current value information and a preset fault current threshold; If a faulty operating state is identified in the busbar three-phase line, the front circuit breaker 1 and the front circuit breaker 2 are controlled to close; Controlling the closing of corresponding phase switches in the phase circuit breaker according to the plurality of phase current value information; receiving phase selection current feedback information fed back by the first current transformer, and generating phase selection judgment information according to the phase selection current feedback information; If there is a correct identification mark in the phase selection judgment information, the arc extinguishing switch is controlled to close; If there is an erroneous mark in the phase selection judgment information, the phase switches are re-screened for closing until a correct mark is identified in the phase selection judgment information.

[0010] Optionally, after a correct identification mark is identified in the phase selection judgment information and a corresponding phase switch is closed, the method further includes: After waiting for a preset instantaneous delay time, the target phase switch is controlled to open, and the operation status of the bus three-phase line is identified by using the currently acquired multiple phase current value information; If normal operation is identified in the operating state of the busbar three-phase line, the front circuit breaker 1 and the front circuit breaker 2 are controlled to be opened; If faulty operation is identified in the operating status of the bus three-phase line, the operating status of the bus three-phase line is periodically obtained with a preset dwell time until the operating status of the bus three-phase line is normal, and the front circuit breaker 1 and the front circuit breaker 2 are controlled to be opened, or after the bus three-phase line is currently identified, if the faulty operation time is greater than the preset arc extinguishing coil working time, the front circuit breaker 1 is controlled to be opened, and the periodic cycle processing is stopped.

[0011] Optionally, the method further includes: Obtain the electrical quality information of the current bus three-phase line in the power distribution system; Acquire ground fault data and regional power distribution electrical quality data in multiple regions in a designated network address or a database pre-entered by a user, wherein the ground fault data includes multiple ground fault current values ​​in the region; Matching the corresponding target area power distribution electrical quality data and target ground fault data according to the electrical quality information, and matching the current reactance capacity range information of the arc suppression coil according to the preset fault current reactance data; According to the reactance capacity range information of the current arc suppression coil, the corresponding adjustable arc suppression coil model is screened out.

[0012] Optionally, the method further includes: According to the fault operation state identified in the bus three-phase line, the corresponding multiple phase current value information and the fault current reactance data are matched to obtain the reactance adjustment value corresponding to the arc suppression coil.

[0013] In the second aspect, the present application provides a main controller based on arc suppression coil parallel operation fault processing, which adopts the following technical solution: A main controller based on arc suppression coil parallel operation fault processing, the main controller comprising: An information acquisition module, used to acquire phase current value information of a bus three-phase line on a power distribution system in real time, and identify the operating state of the bus three-phase line according to a plurality of said phase current value information and a preset fault current threshold; A state recognition control module controls the first and second front circuit breakers to close if a faulty operation state is recognized in the three-phase bus line; A state identification control module controls the closing of corresponding phase switches in the phase circuit breaker according to the plurality of phase current value information; A phase selection judgment module, used for receiving phase selection current feedback information fed back by the first current transformer, and generating phase selection judgment information according to the phase selection current feedback information; A state recognition control module controls the arc extinguishing switch to close if there is a correct identification mark in the phase selection judgment information; The phase selection judgment module re-screens the phase switches for closing if an error mark exists in the phase selection judgment information until a correct mark is identified in the phase selection judgment information.

[0014] In a third aspect, the present application provides a computer-readable storage medium, which adopts the following technical solution: A computer-readable storage medium, wherein at least one instruction, at least one program, a code set or an instruction set is stored in the storage medium, wherein the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by a processor to implement a fault handling method compatible with arc suppression coil operation as described in the second aspect.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: By running the arc suppression coil module and the intelligent grounding module in parallel, the processing speed of single-phase grounding fault and fault arc extinguishing can be accelerated on the one hand, and the continuous working time of the non-fault phase of the busbar can be extended on the other hand, and the problem of insufficient arc suppression coil capacity caused by the rapid increase of system current can be reduced; When a single-phase grounding short circuit fault occurs, the front circuit breaker is quickly controlled to close, thereby suppressing the arc grounding overvoltage and slowing down the rising speed of the fault phase recovery voltage, thereby reducing the damage of the single-phase short circuit fault to the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1This is a circuit schematic diagram of a fault handling device that is compatible with arc suppression coil operation provided in an embodiment of the present application.

[0018] Figure 2 It is a schematic diagram of a fault handling method compatible with arc suppression coil operation provided in an embodiment of the present application.

[0019] Figure 3 It is a further flow chart of a fault handling method compatible with arc suppression coil operation provided in an embodiment of the present application.

[0020] Figure 4 This is a schematic diagram of a process for selecting a corresponding adjustable arc suppression coil model provided in an embodiment of the present application. Figure 5 It is a modular block diagram of a main controller provided in an embodiment of the present application.

[0021] Explanation of the accompanying drawings: 1. Arc suppression coil module; 2. Intelligent grounding module; 21. Fault phase selection submodule; 22. Fault line selection submodule; 301. Information acquisition module; 302. State recognition control module; 303. Phase selection judgment module; 304. Information matching module. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with Figures 1-5.

[0023] The present application provides a fault handling device compatible with arc suppression coil operation, such as Figure 1 As shown, the device includes an arc suppression coil module and an intelligent grounding module, and the arc suppression coil module is connected in parallel with the intelligent grounding module.

[0024] By running the arc suppression coil module and the intelligent grounding module in parallel, on the one hand, the speed of single-phase grounding fault and fault arc extinguishing can be accelerated; on the other hand, the duration of continuous operation of the non-fault phase of the busbar in the case of permanent single-phase grounding fault can be extended, and the problem of insufficient arc suppression coil capacity caused by rapid growth of system current can be reduced.

[0025] It should be noted that after a single-phase ground short-circuit fault is identified at the feeder end, in order to facilitate rapid preliminary identification of the phase where the fault is located, a third current transformer can be installed on the bus three-phase line to monitor the current changes of each phase on the bus three-phase line.

[0026] The arc suppression coil module includes a front circuit breaker, a grounding transformer, an arc suppression coil and a current limiting resistor.

[0027] The three-phase incoming line terminal of the front circuit breaker 1 is connected to the three-phase line of the distribution system bus in a one-to-one correspondence, the three-phase output line of the front circuit breaker 1 is connected to the three-phase incoming line terminal of the grounding transformer 1 in a one-to-one correspondence, the neutral point of the grounding transformer 1 is connected to one end of the arc suppression coil, the other end of the arc suppression coil is connected to the current limiting resistor 1, and the other end of the current limiting resistor 1 is grounded.

[0028] When a single-phase grounding short circuit fault occurs, the front circuit breaker is quickly controlled to close, thereby suppressing the arc grounding overvoltage and slowing down the rising speed of the fault phase recovery voltage, thereby reducing the damage of the single-phase short circuit fault to the equipment.

[0029] The intelligent grounding module includes a front circuit breaker 2, a fault phase selection submodule, a fault line selection submodule and a main controller. The three-phase line of the distribution system bus is connected one-to-one with the three-phase incoming line terminal of the front circuit breaker 2. The fault phase selection submodule is connected in series with the front circuit breaker and then grounded, and the fault line selection submodule is connected in parallel with the fault phase selection submodule.

[0030] Among them, the fault phase selection submodule includes an arc-extinguishing phase circuit breaker, a second current limiting resistor, an arc-extinguishing switch and a first current mutual inductance.

[0031] The input ends of the three phase switches in the arc-extinguishing phase circuit breaker are respectively connected to the three-phase output lines of the front circuit breaker 2 in a one-to-one correspondence. One end of the current limiting resistor 2 is simultaneously connected to the output ends of multiple phase switches, the other end of the current limiting resistor 2 is grounded, and the arc-extinguishing switch is connected in parallel to the current limiting resistor 2. The first current transformer is mounted on the common grounding line of the current limiting resistor 2 and the arc-extinguishing switch.

[0032] The fault line selection submodule includes a three-phase contactor, a second grounding transformer with impedance, and a second current transformer. The three-phase input terminals of the three-phase contactor are respectively connected to the three-phase output terminals of the second front circuit breaker in a one-to-one correspondence. The output terminal of the three-phase contactor is connected to the three-phase input terminal of the second grounding transformer. The output terminal of the second grounding transformer is grounded. The second current transformer is installed on the output line of the second grounding transformer.

[0033] The input end of the main controller receives current monitoring information fed back by the first current transformer and the second current transformer. The multiple control ends of the main controller are respectively connected to the control end of the pre-circuit breaker one, the control end of the pre-circuit breaker two, the control end of the arc-extinguishing phase circuit breaker, the control end of the arc-extinguishing switch and the control end of the three-phase contactor to control the opening and closing of the pre-circuit breaker one, the pre-circuit breaker two, the arc-extinguishing phase circuit breaker, the arc-extinguishing switch and the three-phase contactor according to the current monitoring information.

[0034] After a short-circuit fault current is detected on the feeder of the distribution system, the main controller controls the front circuit breaker 1 and the front circuit breaker 2 to close, and further performs fault phase selection through the fault phase selection submodule.

[0035] During the fault phase selection process of the main controller, the fault phase selection submodule first closes a phase switch in the arc-extinguishing phase circuit breaker, and then monitors the current flowing through the second current limiting resistor and the related vector relationship through the first current transformer, so as to determine whether the phase selection is accurate.

[0036] If the fault phase is selected correctly, the arc extinguishing switch is closed to make the fault phase metallically grounded. If the phase is selected incorrectly, the closed phase switch is opened and another phase switch is selected to complete the phase selection action again.

[0037] An embodiment of the present application provides a fault handling method compatible with arc suppression coil operation. The method can be applied to a fault handling device compatible with arc suppression coil operation. The executor of the method can be a main controller in the fault handling device compatible with arc suppression coil operation, and can be assisted by an arc suppression coil module, an intelligent grounding module, and multiple third current transformers.

[0038] The following will be combined with specific implementation methods. Figure 2 The processing flow shown is described in detail, and the content can be as follows: S101, obtaining phase current value information of a bus three-phase line on a power distribution system in real time, and identifying the operating state of the bus three-phase line according to multiple phase current value information and a preset fault current threshold.

[0039] In implementation, the main controller receives the current monitoring information fed back by the third current transformer in real time, where the current monitoring information is the phase current value information on the three-phase line of the bus.

[0040] Then the main controller compares the phase current values ​​in the multiple phase current value information obtained in real time with the fault current threshold. If the phase current value of a phase is greater than the fault current threshold, the phase is identified as a faulty phase with faulty operation, and the current bus three-phase line is marked as a faulty operation state. If the three-phase phase current values ​​are all less than or equal to the fault current threshold, the current bus three-phase line is identified as a normal operation state.

[0041] In the embodiment of the present application, only single-phase grounding fault is processed. If a multi-phase fault is identified, the circuit breaker at the front end of the busbar is directly controlled to open, thereby reducing the damage caused by the multi-phase fault to the circuit.

[0042] S102: If a faulty operation state is identified in the bus three-phase line, the front circuit breaker 1 and the front circuit breaker 2 are controlled to close.

[0043] During implementation, if the main controller identifies that the current bus three-phase line is in a faulty operating state, it first controls the front circuit breaker 1 and the front circuit breaker 2 to close, so that the arc extinguishing coil is connected to the distribution system and the capacitor on the feeder side corresponding to the fault is arc extinguished in time.

[0044] S103, controlling the corresponding phase switches in the phase circuit breaker to close according to the multiple phase current value information.

[0045] In implementation, the main controller compares the phase current value information with the fault current threshold, preliminarily identifies the faulty phase, and then controls the corresponding phase switch in the arc-extinguishing phase circuit breaker to close.

[0046] S104, receiving phase selection current feedback information fed back by the first current transformer, and generating phase selection judgment information according to the phase selection current feedback information.

[0047] In implementation, the main controller receives the phase selection current feedback information fed back by the first current transformer, and generates phase selection judgment information carrying a correct identification mark or an incorrect identification mark through the current value and related vector relationship in the phase selection current feedback information.

[0048] S105, if the phase selection judgment information contains a correct identification mark, the arc extinguishing switch is controlled to close.

[0049] During implementation, when the main controller recognizes that there is a correct identification mark in the current phase selection judgment information, it controls the arc suppression switch to close, so that the fault phase is metallically grounded, and the current of the fault phase flows to the ground through the arc suppression switch, thereby reducing the current flowing through the fault phase at the feeder end and reducing the impact of the single-phase short circuit fault.

[0050] S106, if there is an erroneous mark in the phase selection judgment information, re-screen the phase switches for closing until a correct mark is identified in the phase selection judgment information.

[0051] In implementation, if the main controller recognizes that there is an erroneous mark in the current phase selection judgment information, it repeats the above steps S103 and S104 until there is a correct mark in the phase selection judgment information, and then executes step S105.

[0052] Optionally, after the correct identification is identified in the phase selection judgment information and the corresponding phase switch is closed, the following also exists: Figure 3 The specific process is as follows: S107, after waiting for a preset instantaneous delay time, control the target phase switch to open, and identify the operating status of the bus three-phase line with the currently acquired multiple phase current value information.

[0053] In implementation, after selecting the correct fault phase, the main controller waits for a preset instantaneous delay time length, where the preset instantaneous delay time length may be 50ms, 80ms, 2s, etc.

[0054] After waiting for the instantaneous delay time, the main controller controls the arc extinguishing switch and the phase-splitting switch that has been closed to open in turn. The phase-splitting switch that has been closed and then opened is called the target phase-splitting switch, and the target phase-splitting switch here is the phase-splitting switch corresponding to the fault.

[0055] Then the main controller compares the currently obtained multiple phase current value information with the fault current threshold again to determine whether the single-phase ground short-circuit fault disappears after the instantaneous delay time. If the single-phase ground short-circuit fault disappears, the current single-phase ground short-circuit fault is recorded as an instantaneous fault; if the single-phase ground short-circuit fault does not disappear, the current single-phase ground short-circuit fault is recorded as a permanent fault.

[0056] S108, if normal operation is identified in the operation state of the busbar three-phase line, the front circuit breaker 1 and the front circuit breaker 2 are controlled to be opened.

[0057] In implementation, if the main controller identifies that the operating state of the bus three-phase line is normal operation, that is, the current single-phase short circuit fault is an instantaneous fault, it controls the front circuit breaker 1 and the front circuit breaker 2 to open.

[0058] S109, if a faulty operation is identified in the operating status of the bus three-phase line, the operating status of the bus three-phase line is periodically obtained with a preset dwell time until the operating status of the bus three-phase line is normal operation and the front circuit breaker 1 and the front circuit breaker 2 are controlled to be opened, or after the bus three-phase line is currently identified, if the faulty operation time is greater than the preset arc extinguishing coil working time, the front circuit breaker 1 is controlled to be opened and the cyclic processing is stopped.

[0059] In implementation, if the main controller identifies that the operation state of the bus three-phase line is fault operation, that is, the current single-phase short circuit fault is a permanent fault, the main controller can also perform the following cyclic processing, where the cycle processing is performed with a preset dwell time, and the dwell time can be 10 minutes: The main controller first opens the arc-extinguishing switch and the target opening switch in turn every 10 minutes, and then obtains the operating status of the bus three-phase line to determine whether the fault is eliminated.

[0060] If the fault is eliminated, the front circuit breaker 1 and the front circuit breaker 2 are controlled to open and the cycle stops.

[0061] If the fault has not been eliminated, the arc extinguishing switch and the target opening switch are controlled to close, and then the next 10-minute cycle is carried out.

[0062] Here, when the operation with fault is greater than the preset arc extinguishing coil working time, the cycle stops, and the main controller controls the front circuit breaker to open. The arc extinguishing coil working time is generally between 1 and 2 hours, and the specific time can be set according to different equipment.

[0063] Optionally, in this application, there is also Figure 4 The specific operation process is as follows: S201, obtaining electrical quality information of the current bus three-phase line in the power distribution system.

[0064] In implementation, the main controller obtains the electrical quality information of the current bus three-phase line of the power distribution system, where the electrical quality information includes voltage and transmission power.

[0065] S202, acquiring ground fault data and regional power distribution electrical quality data in multiple areas from a designated network address or a database pre-entered by a user, wherein the ground fault data includes multiple ground fault current values ​​in the area.

[0066] In implementation, the main controller can obtain from a specified network address, or receive multiple regional power distribution electrical quality data pre-entered by a user. Here, the regional power distribution electrical quality data is used to reflect the electrical quality of multiple regional power distributions.

[0067] At the same time, the main controller also obtains the ground fault data of the power distribution electrical quality data of the corresponding area through the same channel. The ground fault data includes the ground fault current value when single-phase ground faults occur multiple times in the area.

[0068] S203, matching the corresponding target area power distribution electrical quality data and target ground fault data according to the electrical quality information, and matching the reactance capacity range information of the current arc suppression coil according to the preset fault current reactance data.

[0069] In implementation, the main controller matches multiple regional power distribution power quality data with the power quality information, which are referred to herein as target regional power distribution power quality data.

[0070] Specifically, the voltage value in the electrical quality information is first used to match multiple regional power distribution electrical quality data with the same voltage, and then the transmission power in the electrical quality information is used to match multiple regional power distribution electrical quality data closest to the target area.

[0071] It should be noted that the main controller has preset fault current reactance data, which is used to reflect the relationship between the fault current and the reactance capacity of the selected digestion coil, and the data here can be obtained from the laboratory's priority measurement.

[0072] Furthermore, the reactance capacity range information of the current arc suppression coil is matched with the preset fault current reactance data using multiple target ground fault current values.

[0073] S204: Filter out the corresponding adjustable arc suppression coil model according to the current reactance capacity range information of the arc suppression coil.

[0074] In implementation, the main controller uses the reactance capacity range information of the current arc suppression coil to match the corresponding adjustable arc suppression coil model in the future adjustable arc suppression coil model database.

[0075] Optionally, in this application, there is also the following processing: According to the fault operation state identified in the bus three-phase line, the multiple phase current value information and the fault current reactance data are matched to the reactance adjustment value corresponding to the arc suppression coil.

[0076] During implementation, after the main controller recognizes that the three-phase bus is connected and in a faulty operating state, it monitors the phase current value information corresponding to the fault and matches the reactance adjustment value corresponding to the arc extinguishing coil in the fault current reactance data, so as to adjust the reactance capacity of the arc extinguishing coil.

[0077] like Figure 5 As shown, the embodiment of the present application also discloses a main controller of a fault handling device compatible with arc suppression coil operation, and the main controller includes: The information acquisition module 301 is used to acquire the phase current value information of the bus three-phase line on the power distribution system in real time, and identify the operation status of the bus three-phase line according to the multiple phase current value information and the preset fault current threshold; The state recognition control module 302 controls the front circuit breaker 1 and the front circuit breaker 2 to close if a fault operation state is recognized in the bus three-phase line; The state identification control module 302 controls the closing of the corresponding phase switches in the phase circuit breaker according to the information of the multiple phase current values; The phase selection judgment module 303 is used to receive the phase selection current feedback information fed back by the first current transformer, and generate the phase selection judgment information according to the phase selection current feedback information; The state recognition control module 302 controls the arc extinguishing switch to close if there is a correct identification mark in the phase selection judgment information; The phase selection judgment module 303, if there is an erroneous mark in the phase selection judgment information, re-screens the phase switches for closing until a correct mark is identified in the phase selection judgment information.

[0078] Optionally, the main controller can also be used to: The state identification control module 302 is used to control the target phase switch to open after waiting for a preset instantaneous delay time, and identify the operation state of the bus three-phase line with the currently acquired multiple phase current value information; The state recognition control module 302 controls the front circuit breaker 1 and the front circuit breaker 2 to open if normal operation is recognized in the operation state of the bus three-phase line; The state identification control module 302, if a fault operation is identified in the operation state of the bus three-phase line, the operation state of the bus three-phase line is periodically obtained with a preset dwell time until the operation state of the bus three-phase line is normal operation, and the front circuit breaker 1 and the front circuit breaker 2 are controlled to be opened, or after the bus three-phase line is currently identified, if the fault operation time is greater than the preset arc extinguishing coil working time, the front circuit breaker 1 is controlled to be opened, and the periodic cycle processing is stopped.

[0079] Optionally, the main controller can also be used to: The information acquisition module 301 is used to obtain the electrical quality information of the current bus three-phase line in the power distribution system; The information acquisition module 301 is used to acquire ground fault data and regional power distribution electrical quality data in multiple regions from a specified network address or a database pre-entered by a user, wherein the ground fault data includes multiple ground fault current values ​​in the region; The information matching module 304 is used to match the corresponding target area power distribution electrical quality data and target ground fault data according to the electrical quality information, and match the current arc suppression coil reactance capacity range information according to the preset fault current reactance data; The information acquisition module 304 is used to filter out the corresponding adjustable arc suppression coil model according to the reactance capacity range information of the current arc suppression coil.

[0080] The main controller may vary greatly due to different configurations or performances, and may include one or more central processing units (e.g., one or more processors) and memories, and one or more storage media (e.g., one or more mass storage devices) for storing applications or data. The memories and storage media may be short-term storage or permanent storage. The program stored in the storage medium may include one or more modules (not shown in the figure), and each module may include a series of instruction operations in the main controller.

[0081] The main controller may also include one or more power supplies, one or more wired or wireless network interfaces, one or more input and output interfaces, one or more keyboards, and / or one or more operating systems.

[0082] The main controller may include a memory and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by one or more processors. The one or more programs include a fault handling method for performing the above-mentioned compatible arc suppression coil operation.

[0083] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program. The program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, etc.

[0084] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

[0085] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A fault handling device compatible with arc suppression coil operation, characterized in that: The device comprises an arc suppression coil module and an intelligent grounding module, wherein the arc suppression coil module and the intelligent grounding module are connected in parallel; The arc suppression coil module includes a pre-circuit breaker 1, a grounding transformer 1, an arc suppression coil and a current limiting resistor 1, the inlet end of the pre-circuit breaker 1 is connected to the busbar of the power distribution system, the output line of the pre-circuit breaker 1 is connected to the inlet end of the grounding transformer 1, the neutral point of the grounding transformer 1 is connected to one end of the arc suppression coil, the other end of the arc suppression coil is connected to the current limiting resistor 1, and the other end of the current limiting resistor 1 is grounded; The intelligent grounding module includes a front circuit breaker 2, a fault phase selection submodule and a fault line selection submodule. The busbar of the power distribution system is connected to the incoming line terminal of the front circuit breaker 2. The fault phase selection submodule is connected in series with the front circuit breaker 2 and then grounded. The fault line selection submodule is connected in parallel with the fault phase selection submodule.

2. The device according to claim 1, characterized in that: The fault phase selection submodule comprises an arc-extinguishing phase-splitting circuit breaker, a second current-limiting resistor and an arc-extinguishing switch, wherein the input ends of the multiple phase-splitting switches in the arc-extinguishing phase-splitting circuit breaker are respectively connected to the multi-phase output lines of the second front circuit breaker, one end of the second current-limiting resistor is simultaneously connected to the output ends of the multiple phase-splitting switches, the other end of the second current-limiting resistor is grounded, and the arc-extinguishing switch is connected in parallel to the second current-limiting resistor; A first current transformer is installed on the common grounding circuit of the second current limiting resistor and the arc extinguishing switch.

3. The device according to claim 2, characterized in that: The fault line selection submodule includes a three-phase contactor and a second grounding transformer with impedance, the three-phase input ends of the three-phase contactor are respectively connected to the three-phase output lines of the second front circuit breaker, the output ends of the three-phase contactor are connected to the three-phase input ends of the second grounding transformer, and the neutral point of the second grounding transformer is grounded; A second current transformer is installed on the grounding line of the second grounding transformer.

4. The device according to claim 3, characterized in that: The device further comprises a main controller, wherein an input end of the main controller receives current monitoring information fed back by the first current transformer and the second current transformer; The multiple control ends of the main controller are respectively connected to the control end of the pre-circuit breaker 1, the control end of the pre-circuit breaker 2, the control end of the arc-extinguishing phase-split circuit breaker, the control end of the arc-extinguishing switch and the control end of the three-phase contactor, so as to control the opening and closing of the pre-circuit breaker 1, the pre-circuit breaker 2, the arc-extinguishing phase-split circuit breaker, the arc-extinguishing switch and the three-phase contactor according to the current monitoring information.

5. A method for handling a fault compatible with arc suppression coil operation, applied to a fault handling device compatible with arc suppression coil operation according to any one of claims 1 to 4, characterized in that: The method comprises: Acquire phase current value information of the bus three-phase line on the power distribution system in real time, and identify the operating status of the bus three-phase line according to a plurality of phase current value information and a preset fault current threshold; If a faulty operating state is identified in the busbar three-phase line, the front circuit breaker 1 and the front circuit breaker 2 are controlled to close; Controlling the closing of corresponding phase switches in the phase circuit breaker according to the plurality of phase current value information; receiving phase selection current feedback information fed back by the first current transformer, and generating phase selection judgment information according to the phase selection current feedback information; If there is a correct identification mark in the phase selection judgment information, the arc extinguishing switch is controlled to close; If there is an erroneous mark in the phase selection judgment information, the phase switches are re-screened for closing until a correct mark is identified in the phase selection judgment information.

6. The method according to claim 5, characterized in that After a correct identification mark is found in the phase selection judgment information and a corresponding phase switch is closed, the method further includes: After waiting for a preset instantaneous delay time, the target phase switch is controlled to open, and the operation status of the bus three-phase line is identified by using the currently acquired multiple phase current value information; If normal operation is identified in the operating state of the busbar three-phase line, the front circuit breaker 1 and the front circuit breaker 2 are controlled to be opened; If faulty operation is identified in the operating status of the bus three-phase line, the operating status of the bus three-phase line is periodically obtained with a preset dwell time until the operating status of the bus three-phase line is normal, and the front circuit breaker 1 and the front circuit breaker 2 are controlled to be opened, or after the bus three-phase line is currently identified, if the faulty operation time is greater than the preset arc extinguishing coil working time, the front circuit breaker 1 is controlled to be opened, and the periodic cycle processing is stopped.

7. The method according to claim 5, characterized in that The method further comprises: Obtain the electrical quality information of the current bus three-phase line in the power distribution system; Acquire ground fault data and regional power distribution electrical quality data in multiple regions in a designated network address or a database pre-entered by a user, wherein the ground fault data includes multiple ground fault current values ​​in the region; Matching the corresponding target area power distribution electrical quality data and target ground fault data according to the electrical quality information, and matching the current reactance capacity range information of the arc suppression coil according to the preset fault current reactance data; According to the reactance capacity range information of the current arc suppression coil, the corresponding adjustable arc suppression coil model is screened out.

8. The method according to claim 7, characterized in that The method further comprises: According to the fault operation state identified in the bus three-phase line, the corresponding multiple phase current value information and the fault current reactance data are matched to obtain the reactance adjustment value corresponding to the arc suppression coil.

9. A main controller of a fault handling device compatible with arc suppression coil operation, characterized in that: The main controller comprises: An information acquisition module, used to acquire phase current value information of a bus three-phase line on a power distribution system in real time, and identify the operating state of the bus three-phase line according to a plurality of said phase current value information and a preset fault current threshold; A state recognition control module controls the first and second front circuit breakers to close if a faulty operation state is recognized in the three-phase bus line; A state recognition control module controls the closing of corresponding phase switches in the phase circuit breaker according to the plurality of phase current value information; A phase selection judgment module, used for receiving phase selection current feedback information fed back by the first current transformer, and generating phase selection judgment information according to the phase selection current feedback information; A state recognition control module controls the arc extinguishing switch to close if there is a correct identification mark in the phase selection judgment information; The phase selection judgment module re-screens the phase switches for closing if an error mark exists in the phase selection judgment information until a correct mark is identified in the phase selection judgment information.

10. A computer-readable storage medium, characterized in that: The storage medium stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set are loaded and executed by the processor to implement a fault handling method for operation of a compatible arc suppression coil as described in any one of claims 5 to 8.

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