Phase-judgment error-proof grounding device and method

Abstract

The present invention provides a phase-judgment error-proof grounding disposal device and method, which relates to the field of power distribution management technology. The device includes a pre-circuit breaker, a fault phase selection module and a fault line selection module. The three-phase line derived from the busbar of the power distribution system is connected to the pre-circuit breaker, the fault phase selection module is connected in series with the pre-circuit breaker and then grounded, and the fault line selection module is connected in parallel with the fault phase selection module; the fault phase selection module includes an arc-extinguishing phase-splitting circuit breaker, a current limiting resistor and an arc-extinguishing switch. The input ends of multiple phase switches in the arc-extinguishing phase-splitting circuit breaker are respectively connected to the multi-phase output lines of the pre-circuit breaker, one end of the current limiting resistor is simultaneously connected to the output ends of multiple phase switches, the other end of the current limiting resistor is grounded, and the arc-extinguishing switch is connected in parallel to the current limiting resistor; a first current transformer is installed on the common grounding line of the current limiting resistor and the arc-extinguishing switch. The present application can maintain the stable operation of the power distribution system for a period of time without faults when facing a single-phase grounding permanent fault.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution management, and in particular to a phase-detection and error-proof grounding device and method. Background Art

[0002] Switch-type arc extinguishing equipment is widely used because of its high safety and ability to extinguish arcs in a timely manner. Among them, the grounding switch-type arc extinguishing equipment in the distribution network determines the single-phase grounding fault through 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 between the fault phase and the ground drops to zero. The arc at the original fault point will inevitably be extinguished, avoiding the generation of arc overvoltage, and the voltage between the other two phases and the ground is limited to the level of the line voltage, ensuring the safe and reliable operation of the power grid.

[0003] Generally speaking, the switch-type arc extinguishing device suppresses arc-grounding overvoltage by connecting an arc extinguishing coil in series at the neutral point, and can slow down the rising speed of the fault phase recovery voltage. However, when the system current increases rapidly, the capacity of the arc extinguishing coil is usually difficult to meet the requirements. In the face of permanent faults, the arc extinguishing effect is poor. In the process of fault phase selection, if the wrong fault phase is selected, the non-fault phase is grounded, which not only fails to achieve the arc extinguishing effect, but also causes a phase-to-phase short circuit, causing the switch-type arc extinguishing device to exit, resulting in arc extinguishing failure. Summary of the invention

[0004] In order to enhance the arc extinguishing effect of the switch-type arc extinguishing equipment during permanent faults, the present application provides a phase-detection and error-proof grounding disposal device and method.

[0005] In the first aspect, the present application provides a phase-judgment error-proof grounding device, which adopts the following technical solution:

[0006] A phase-judgment error-proof grounding device, comprising a front circuit breaker, a fault phase selection module and a fault line selection module, wherein a three-phase line derived from a power distribution system bus is connected to the front circuit breaker, the fault phase selection module is connected in series with the front circuit breaker and then grounded, and the fault line selection module is connected in parallel with the fault phase selection module;

[0007] The fault phase selection module comprises an arc-extinguishing phase-splitting circuit breaker, a 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 pre-circuit breaker, one end of the current-limiting resistor is simultaneously connected to the output ends of the multiple phase-splitting switches, the other end of the current-limiting resistor is grounded, and the arc-extinguishing switch is connected in parallel to the current-limiting resistor;

[0008] A first current transformer is installed on a common grounding line of the current limiting resistor and the arc extinguishing switch.

[0009] Optionally, the fault line selection module includes a three-phase contactor and an impedance grounding transformer, the three-phase input ends of the three-phase contactor are respectively connected to the three-phase output lines of the front circuit breaker, the output ends of the three-phase contactor are connected to the three-phase input ends of the impedance grounding transformer, and the neutral point of the impedance grounding transformer is grounded;

[0010] A second current transformer is installed on the grounding line of the impedance grounding transformer.

[0011] 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;

[0012] The multiple control ends of the main controller are respectively connected to 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 arc-extinguishing phase circuit breaker, the arc-extinguishing switch and the three-phase contactor according to the current monitoring information.

[0013] In the second aspect, the present application provides a phase-error grounding treatment method, which adopts the following technical solution:

[0014] A phase-error-detection type grounding treatment method is applied to the phase-error-detection type grounding treatment device described in the first aspect. After receiving short-circuit fault information fed back from the feeder side of the power distribution system, the method comprises:

[0015] The following steps are executed cyclically until all the phase switches in the phase circuit breaker are in an over-closed state or the arc-extinguishing switch is closed during the cyclic processing:

[0016] According to the phase current monitoring information on the three-phase line of the power distribution system busbar obtained in real time, the corresponding phase switches in the phase circuit breaker are controlled to close;

[0017] 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;

[0018] If there is a correct identification mark in the phase selection judgment information, the arc extinguishing switch is controlled to be closed;

[0019] If there is an error mark in the phase selection judgment information, the closed phase switch in the phase circuit breaker is disconnected.

[0020] Optionally, the method further includes:

[0021] Acquire fault identification record data recorded in a storage database, wherein the fault identification record data includes a plurality of fault phase selection record information;

[0022] Generate phase selection error probability and misidentification fault probability change information based on the plurality of fault phase selection record information, and compare the phase selection error probability with a preset error identification threshold;

[0023] If the phase selection error probability is greater than or equal to the error identification threshold, generating device self-check information;

[0024] If the phase selection error probability is less than the error identification threshold, a normal error range is generated.

[0025] Optionally, after generating the device self-check information, the method further includes:

[0026] According to the error fault probability change information, the current phase selection misjudgment probability within a preset evaluation time before the current moment is obtained;

[0027] According to the current phase selection misjudgment probability, the misidentification fault probability change information and the preset misjudgment peak line threshold, the corresponding target optimization adjustment scheme is matched among multiple preset optimization adjustment schemes, and the multiple optimization adjustment schemes at least include environmental interference elimination, device component aging maintenance and device component replacement maintenance.

[0028] In a third aspect, the present application provides a main controller of a phase misplacement type grounding disposal device, which adopts the following technical solution:

[0029] A main controller of a phase misplacement type grounding treatment device, the main controller comprising an information acquisition module and an information determination module;

[0030] The information acquisition module and the information identification module cyclically execute the following steps until, during the cyclic processing, all the phase switches in the phase circuit breaker are in an over-closed state or the arc-extinguishing switch is closed:

[0031] An information acquisition module is used to control the closing of the corresponding phase switch in the phase circuit breaker according to the phase current monitoring information on the three-phase line of the distribution system busbar acquired in real time;

[0032] An information determination module, configured to receive the phase selection current feedback information fed back by the first current transformer, and generate phase selection determination information according to the phase selection current feedback information;

[0033] If there is a correct identification mark in the phase selection judgment information, the arc extinguishing switch is controlled to be closed;

[0034] If there is an error mark in the phase selection judgment information, the closed phase switch in the phase circuit breaker is disconnected.

[0035] In a fourth aspect, the present application provides a computer-readable storage medium, which adopts the following technical solution:

[0036] A computer-readable storage medium, wherein at least one instruction, at least one program, code set or instruction set is stored in the storage medium, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by a processor to implement the phase-misplacement type grounding treatment method as described in the second aspect.

[0037] In summary, the present application includes at least one of the following beneficial technical effects:

[0038] After the short-circuit fault current is detected on the feeder of the distribution system, the fault phase selection module first closes a phase switch in the arc-extinguishing phase-splitting circuit breaker, and then monitors the current flowing through the current-limiting resistor and the related vector relationship through the first current transformer, so as to judge whether the phase selection is accurate; if the phase selection is correct, the arc-extinguishing switch is closed to make the fault phase metallically grounded; if the phase selection is wrong, the closed phase switch is opened, and other phase switches are selected to complete the phase selection action again, and at this time the fault phase is grounded through the current-limiting resistor to avoid the phase-to-phase short circuit; through the above process, the fault phase is first passed through the current-limiting resistor and then directly metallically grounded, which can suppress the arc grounding overvoltage and slow down the rise speed of the fault phase recovery voltage, and then the fault phase is metallically grounded, so that the fault phase voltage drops to zero, and can maintain the stable operation of the distribution system for a period of time when facing a single-phase grounding permanent fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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.

[0040] Figure 1 It is a circuit schematic diagram of a phase determination and anti-wrong grounding treatment device provided in an embodiment of the present application.

[0041] Figure 2 It is a flow chart of a phase misplacement type grounding treatment method provided in an embodiment of the present application.

[0042] Figure 3 It is a flowchart of a device self-check provided in an embodiment of the present application.

[0043] Figure 4 It is a modular block diagram of the main controller in the embodiment of the present application.

[0044] Explanation of the reference numerals: 1. pre-circuit breaker; 2. fault phase selection module; 3. fault line selection module; 301. information acquisition module; 302. information identification module; 303. data calculation and processing module; 304. optimization and adjustment module. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will be combined with the attached Figure 1-4 The embodiments of the present invention are described in further detail.

[0046] An embodiment of the present application provides a phase-detection and anti-wrong grounding processing device, which is installed in a switch-type arc extinguishing device, wherein the phase-detection and anti-wrong grounding processing device includes a pre-circuit breaker 1, a fault phase selection module 2, a fault line selection module 3 and a main controller.

[0047] When a short-circuit grounding fault occurs at the feeder end of the power distribution system, the fault phase selection module 2 identifies the phase where the short-circuit fault is located, and then the fault line selection module 3 identifies the line where the short-circuit fault is located, thereby locating the fault location and reducing the fault detection time.

[0048] The three-phase lines of the power distribution system bus are respectively connected to the three-phase incoming line terminals of the front circuit breaker 1. The fault phase selection switch is connected in series with the front circuit breaker 1 and then grounded, and the fault line selection module 3 is connected in parallel with the fault phase selection switch.

[0049] Among them, the fault phase selection module 2 includes an arc-extinguishing phase-splitting circuit breaker, a current-limiting resistor R and an arc-extinguishing switch K1. The input ends of the three phase-splitting switches in the arc-extinguishing phase-splitting circuit breaker are respectively connected to the three-phase output lines of the front circuit breaker 1 in a one-to-one correspondence. One section of the current-limiting resistor R is simultaneously connected to the output ends of multiple phase-splitting switches, and the other end of the current-limiting resistor R is grounded. The arc-extinguishing switch K1 is connected in parallel to the current-limiting resistor R.

[0050] A first current transformer is installed on the common grounding line of the current limiting resistor R and the arc extinguishing switch K1.

[0051] After a short-circuit fault current is detected on the feeder of the power distribution system, the fault phase selection module 2 first closes a phase switch in the arc-extinguishing phase circuit breaker, and then monitors the current flowing through the current limiting resistor R and the related vector relationship through the first current transformer, so as to determine whether the phase selection is accurate.

[0052] If the phase selection is correct, the arc extinguishing switch K1 is closed to make the fault phase metallically grounded.

[0053] If the phase selection is wrong, open the closed phase switch and select another phase switch to complete the phase selection action again.

[0054] Here, the first phase selection of the fault phase selection module 2 can be randomly selected, or a third current transformer can be installed on the three-phase line of the distribution system bus, and the current of each item is monitored by the third current transformer for identification and selection. In the embodiment of the present application, it is preferred to install multiple third current transformers.

[0055] At the same time, here, after the phase selection of the fault phase is completed, it is possible to determine whether the current short-circuit fault is a transient fault by disconnecting the phase-splitting switch again. For the sake of convenience, the phase-splitting switch after the phase selection is correct is called the fault phase phase-splitting switch. Specifically, the user can set the delay time to close the fault phase phase-splitting switch and disconnect the fault phase phase-splitting switch again after the set delay time.

[0056] At this time, if the grounding fault still exists after the fault phase phase-splitting switch is disconnected again, that is, the fault current still exists, then the current short-circuit fault is judged to be a permanent single-phase grounding fault. If the grounding fault disappears after the fault phase phase-splitting switch is disconnected again, that is, the fault current disappears, then the current short-circuit fault is judged to be a transient single-phase grounding fault.

[0057] The fault line selection module 3 includes a three-phase contactor K2 and an impedance grounding transformer. The three-phase input terminals of the three-phase contactor K2 are respectively connected to the three-phase output terminals of the front circuit breaker 1. The output terminal of the three-phase contactor K2 is connected to the three-phase incoming terminal of the impedance grounding transformer. The output terminal of the impedance grounding transformer is grounded, and a second current transformer is installed on the output line of the impedance grounding transformer.

[0058] After the short-circuit fault current is monitored on the feeder of the distribution system and the fault phase selection is completed, the three-phase contactor K2 is closed. At this time, the fault branch flows through a zero-sequence current with obvious characteristics, so that the line can be selected by analyzing the zero-sequence current captured by the second current transformer.

[0059] The main controller receives current monitoring signals monitored by the first current transformer and multiple third current transformers. Multiple control ends of the main controller are respectively connected to the control end of the arc-extinguishing phase circuit breaker, the control end of the arc-extinguishing switch K1, and the control end of the three-phase contactor K2. The main controller can be used as an executive body to control the execution of the above steps, so as to control the opening and closing of the arc-extinguishing phase circuit breaker, the arc-extinguishing switch K1, and the three-phase contactor K2 according to the current monitoring information.

[0060] The present application also provides a phase-error-detection type grounding treatment method, which can be applied to a phase-error-detection type grounding treatment device, and the executor of the method can be a main controller in the phase-error-detection type grounding treatment device.

[0061] The following will be combined with specific implementation methods. Figure 2The processing flow shown is described in detail. After receiving the short-circuit fault information fed back from the feeder side of the power distribution system, the method includes:

[0062] The following steps are executed cyclically until all the phase switches in the phase circuit breaker are in an over-closed state or the arc-extinguishing switch is closed during the cyclic processing:

[0063] Step S101, according to the real-time acquired phase current monitoring information on the three-phase bus line of the power distribution system, the corresponding phase switches in the phase circuit breaker are controlled to close.

[0064] In implementation, the three-phase lines of the power distribution system bus are equipped with a third current transformer. When a ground short circuit fault occurs in the feeder of the power distribution system, the main controller receives the current monitoring signals fed back by multiple third current transformers, so as to facilitate the initial determination of the fault phase of the single-phase ground short circuit fault. The current monitoring information fed back by the third current transformer is referred to as phase current monitoring information.

[0065] When the main controller identifies the fault current in the multiple phase current monitoring information received in real time, the corresponding phase switch where the fault current is identified is controlled to be closed. For example, if the fault current exists in phase A, the corresponding phase switch of A is controlled to be closed.

[0066] If all the phase switches in the phase circuit breaker are in a closed state in the current cycle, the cycle is exited.

[0067] Step S102, 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.

[0068] 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.

[0069] Step S103: If there is a correct identification mark in the phase selection judgment information, the consumption switch is controlled to be closed.

[0070] In implementation, when the main controller recognizes that there is a correct identification mark in the current phase selection judgment information, it controls the consumption switch to close and exits the loop.

[0071] Step S104: if there is an error mark in the phase selection judgment information, the closed phase switch in the phase circuit breaker is disconnected.

[0072] In implementation, if the main controller recognizes that there is an error mark in the current phase selection judgment information, the closed phase switch in the segmented phase circuit breaker is closed, and the above steps S101 and S102 are repeated;

[0073] After generating new phase selection judgment information, if there is a correct identification mark in the phase selection judgment information, the consumption switch is controlled to be closed and the loop is jumped out; if there is an incorrect identification mark in the phase selection judgment information, the loop is entered again.

[0074] Optionally, in this application, there is also Figure 3 The specific execution steps are as follows:

[0075] Step S201, obtaining fault identification record data recorded in a storage database, wherein the fault identification record data includes a plurality of fault phase selection record information.

[0076] In implementation, the main controller obtains the fault identification record data recorded in its own storage database, and the fault identification record data includes multiple fault phase selection record information and multiple fault line selection record information, which are used to feedback the historical fault phase selection situation and historical fault line selection situation of the main controller.

[0077] Step S202, generating phase selection error probability and fault identification probability change information according to a plurality of fault phase selection record information, and comparing the phase selection error probability with a preset error identification threshold.

[0078] In implementation, the main controller records information of multiple fault phase selections, divides and summarizes the phase selection error probability and the change of phase selection error probability before the current moment, and the change of phase selection error probability is recorded as the error fault probability change information.

[0079] Then the main controller compares the phase selection error probability with a preset error recognition threshold, and the comparison results are the following two, corresponding to step S203 and step S204 respectively.

[0080] Step S203: if the phase selection error probability is greater than or equal to a preset error recognition threshold, then device self-check information is generated.

[0081] During implementation, the main controller compares the probability of phase selection error with the preset error recognition threshold. When the probability of phase selection error is greater than or equal to the preset error recognition threshold, it generates device self-test information to reflect that the current phase-judgment error-proof grounding disposal device needs self-test, thereby reducing the possibility of frequent misjudgment of grounding fault phases.

[0082] Step S204: if the phase selection error probability is less than the error recognition threshold, a normal error range is generated.

[0083] In implementation, the main controller compares the phase selection error probability with a preset error recognition threshold, and generates a normal error range when the phase selection error probability is less than the error recognition threshold.

[0084] Optionally, after step S203, there are the following processing steps, and the specific processing flow is as follows:

[0085] According to the error fault probability change information, the current phase selection misjudgment probability within the preset evaluation time before the current moment is obtained.

[0086] In implementation, in order to understand the probability of identifying an erroneous fault phase within a period of time before the current moment, the main controller identifies the fault probability change information and obtains the current phase selection misjudgment probability within the evaluation time before the current moment.

[0087] According to the current phase selection misjudgment probability, the misidentification fault probability change information and the preset misjudgment peak line threshold, the corresponding target optimization adjustment scheme is matched among multiple preset optimization adjustment schemes.

[0088] In implementation, the main controller divides the current phase selection misjudgment probability by a preset misjudgment peak line threshold, so as to determine whether timely optimization and adjustment are needed. Furthermore, if it is identified that the current phase misjudgment type grounding disposal device does not need to be optimized in time, it is determined whether there is a sudden increase at present, and timely optimization and adjustment are made in response to the sudden increase phenomenon.

[0089] Specifically, the processing of matching the corresponding target optimization adjustment plan is as follows:

[0090] Compare the current phase selection misjudgment probability with the preset misjudgment peak line threshold, and classify the current phase selection misjudgment probability into a redundant adjustment type or an urgent adjustment type;

[0091] If the current phase selection misjudgment information belongs to the redundant adjustment type, a slow increase mark or a steep increase mark is added to the device self-test information according to the misidentification fault probability change information and the preset misjudgment growth ratio;

[0092] If the current phase selection misjudgment probability belongs to the urgent adjustment type, or the current phase selection misjudgment probability belongs to the redundant adjustment type and carries a steep increase flag, then the current environmental interference amount information at the current moment is obtained;

[0093] According to the current environmental interference amount information and the preset environmental interference amount threshold, an excessive interference mark or a slight interference mark is added to the environmental interference amount information;

[0094] If there is a trace interference mark in the environmental interference information, then the device component maintenance information is generated;

[0095] If there is an excessive interference mark in the environmental interference amount information, the environmental interference elimination data pre-input by the user is obtained, and the multiple phase current monitoring information received in real time after the current moment is optimized and adjusted.

[0096] In implementation, the main controller compares the current phase selection misjudgment probability with the misjudgment peak line threshold. If the current phase selection misjudgment probability is greater than or equal to the misjudgment peak line threshold, the current phase selection misjudgment probability is classified as an urgent adjustment type. If the current phase selection misjudgment probability is less than the misjudgment peak line threshold, the current phase selection misjudgment probability is classified as a redundant adjustment type, so as to determine whether an adjustment is urgently needed after the current moment, so as to reduce the probability of the phase judgment and phase misplacement type grounding disposal device identifying the fault phase incorrectly.

[0097] Then, if the redundancy adjustment type to which the current phase selection misjudgment probability belongs is identified, a slow increase mark or a steep increase mark is added to the device self-check information based on the misidentification fault probability change information and the misjudgment growth ratio.

[0098] It should be noted that here the current growth ratio is calculated by first dividing the current phase selection misjudgment probability by the phase selection error probability, and then the current growth ratio and the misjudgment growth ratio are compared and divided. If the current growth ratio is greater than or equal to the misjudgment growth ratio, a steep increase mark is added to the device self-test information; if the current growth ratio is less than the misjudgment growth ratio, a slow increase mark is added to the device self-test information.

[0099] Next, for the urgent adjustment type of the current phase selection misjudgment probability, or the redundant adjustment type of the current phase selection misjudgment probability and the steep increase mark added in the device self-test information, further optimization processing is performed, and the processing flow is as follows:

[0100] The main controller first obtains the current environmental interference amount information at the current moment, where the environmental interference amount information includes the magnetic field interference amount and the noise interference amount.

[0101] The current magnetic field interference amount and the current noise interference amount are compared with the noise interference threshold and the magnetic field interference threshold in the environmental interference amount threshold respectively. If the magnetic field interference amount is greater than the magnetic field interference threshold or the noise interference amount is greater than the noise interference threshold, an excessive interference mark is added to the current environmental interference information; otherwise, a trace interference mark is added to the environmental interference information.

[0102] Then, if the current environmental interference information carries a trace interference mark, the device maintenance information is generated to remind the staff to perform maintenance and repair on the devices in the phase misplacement type grounding treatment. If the current environmental interference information carries an excessive interference mark, the environmental interference elimination data is used to optimize and adjust the multiple phase current monitoring information obtained after the current time.

[0103] Specifically, in optimizing and adjusting the phase current monitoring information received in real time after the current moment according to the environmental interference elimination data pre-input by the user, the processing flow is as follows:

[0104] Obtaining historical environmental interference information, and obtaining multiple estimated environmental interference time periods based on the historical environmental interference information;

[0105] During the estimated environmental interference period, multiple phase current monitoring information is optimized and adjusted based on the environmental interference amount information obtained and the magnetic field current interference information and noise interference information in the environmental interference elimination data.

[0106] In implementation, a cycle duration is preset in the main controller. In the embodiment of the present application, the cycle duration is preferably one week. The main controller records and estimates the environmental interference amount information based on the cycle duration.

[0107] The historical environmental interference information within multiple cycles before the current moment is obtained. The amount of historical environmental interference information obtained here can also be set by the user, so as to enhance the data processing volume and timeliness of the historical environmental interference information.

[0108] Then the main controller uses the historical environmental interference information corresponding to the same day or hour in multiple cycles. For example, the historical environmental interference information from 9 to 10 a.m. on Monday is obtained, which can be referred to as the target historical environmental interference information. Then, the average of multiple target historical environmental interference information is used to estimate the environmental interference information for a period of time in the future. At the same time, only the environmental interference information in the cycle at the current moment and the next cycle after the current moment is estimated here.

[0109] Then the main controller compares the estimated environmental interference information with the environmental interference amount threshold, and selects a plurality of estimated environmental interference time periods from the current cycle and the next cycle.

[0110] It should be noted that the main controller receives in advance the environmental interference elimination data input by the user, and the environmental interference elimination data is used to record the relationship between the noise amount and the current interference amount and the relationship between the magnetic field amount and the current interference amount.

[0111] After screening out multiple estimated environmental interference time periods, the main controller further optimizes and adjusts multiple phase current monitoring information based on the monitored environmental interference amount information and the magnetic field current interference information and noise interference information in the environmental interference exclusion data after monitoring the arrival of the estimated environmental interference time period.

[0112] In the present application, environmental interference is periodically estimated and eliminated in advance. On the one hand, it can reduce the pressure of data processing on the main controller and reduce the delay in judgment time for timely monitoring and timely processing. On the other hand, it can prioritize the estimation of the processing time required for judgment, reduce the data processing pressure in the main controller, and avoid the situation of processing multiple data in a short period of time.

[0113] The embodiment of the present application also discloses a main controller of a phase-error detection type grounding treatment device, the main controller comprising:

[0114] The information acquisition module 301 is used to control the closing of the corresponding phase switch in the phase circuit breaker according to the phase current monitoring information on the three-phase line of the power distribution system bus acquired in real time;

[0115] The information determination module 302 is used to receive the phase selection current feedback information fed back by the first current transformer, and generate phase selection determination information according to the phase selection current feedback information;

[0116] If the phase selection judgment information contains a correct identification mark, the arc extinguishing switch is controlled to close;

[0117] If there is an error mark in the phase selection judgment information, repeat the above steps.

[0118] Optionally, the main controller can also be used to:

[0119] The information acquisition module 301 is used to acquire the fault identification record data recorded in the storage database, where the fault identification record data includes a plurality of fault phase selection record information;

[0120] The information identification module 302 is used to generate phase selection error probability and fault identification probability change information based on multiple fault phase selection record information, and compare the phase selection error probability with a preset error identification threshold;

[0121] If the probability of phase selection error is greater than or equal to the error identification threshold, then the device self-check information is generated;

[0122] If the probability of phase selection error is less than the error identification threshold, a normal error category is generated.

[0123] Optional, main controller, specifically used for:

[0124] The data calculation and processing module 303 is used to obtain the current phase selection misjudgment probability within a preset evaluation time before the current moment according to the misidentification fault probability change information;

[0125] The optimization and adjustment module 304 is used to match the corresponding target optimization and adjustment scheme in multiple preset optimization and adjustment schemes according to the current phase selection misjudgment probability, the false fault probability change information and the preset misjudgment peak line threshold. The multiple optimization and adjustment schemes at least include environmental interference elimination, device component aging maintenance and device component replacement maintenance.

[0126] 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.

[0127] 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.

[0128] 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 processing for performing the above-mentioned phase misplacement type grounding handling method.

[0129] 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.

[0130] 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.

Claims

1. A phase-judgment error-proof grounding device, characterized in that: The device comprises a front circuit breaker, a fault phase selection module and a fault line selection module, the three-phase line derived from the power distribution system bus is connected to the front circuit breaker, the fault phase selection module is connected in series with the front circuit breaker and then grounded, and the fault line selection module is connected in parallel with the fault phase selection module; The fault phase selection module comprises an arc-extinguishing phase-splitting circuit breaker, a 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 pre-circuit breaker, one end of the current-limiting resistor is simultaneously connected to the output ends of the multiple phase-splitting switches, the other end of the current-limiting resistor is grounded, and the arc-extinguishing switch is connected in parallel to the current-limiting resistor; A first current transformer is installed on the common grounding circuit of the current limiting resistor and the arc extinguishing switch; After receiving the short-circuit fault information fed back from the feeder side of the power distribution system, the phase misplacement type grounding treatment method includes: The following steps are executed cyclically until all the phase switches in the phase circuit breaker are in an over-closed state or the arc extinguishing switch is closed during the cyclic processing: According to the phase current monitoring information on the three-phase line of the power distribution system busbar obtained in real time, the corresponding phase switches in the phase circuit breaker are controlled to close; 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 be closed; If there is an error mark in the phase selection judgment information, disconnecting the closed phase switch in the phase circuit breaker; The method further comprises: Acquire fault identification record data recorded in a storage database, wherein the fault identification record data includes a plurality of fault phase selection record information; Generate phase selection error probability and misidentification fault probability change information based on the plurality of fault phase selection record information, and compare the phase selection error probability with a preset error identification threshold; If the phase selection error probability is greater than or equal to the error identification threshold, generating device self-check information; If the phase selection error probability is less than the error identification threshold, a conventional error category is generated; After the generating device self-check information, the method further includes: According to the error fault probability change information, the current phase selection misjudgment probability within a preset evaluation time before the current moment is obtained; According to the current phase selection misjudgment probability, the misidentified fault probability change information and the preset misjudgment peak line threshold, a corresponding target optimization adjustment scheme is matched in a plurality of preset optimization adjustment schemes, wherein the plurality of optimization adjustment schemes at least include environmental interference elimination, device component aging maintenance and device component replacement maintenance; The processing of matching the corresponding target optimization adjustment plan is as follows: Compare the current phase selection misjudgment probability with the preset misjudgment peak line threshold, and classify the current phase selection misjudgment probability into a redundant adjustment type or an urgent adjustment type; If the current phase selection misjudgment information belongs to the redundant adjustment type, a slow increase mark or a steep increase mark is added to the device self-test information according to the misidentification fault probability change information and the preset misjudgment growth ratio; If the current phase selection misjudgment probability belongs to the urgent adjustment type, or the current phase selection misjudgment probability belongs to the redundant adjustment type and carries a steep increase flag, then the current environmental interference amount information at the current moment is obtained; According to the current environmental interference amount information and the preset environmental interference amount threshold, an excessive interference mark or a slight interference mark is added to the environmental interference amount information; If there is a trace interference mark in the environmental interference information, then the device component maintenance information is generated; If there is an excessive interference mark in the environmental interference amount information, the environmental interference elimination data pre-entered by the user is obtained, and multiple phase current monitoring information received in real time after the current moment is optimized and adjusted; In optimizing and adjusting the phase current monitoring information received in real time after the current moment according to the environmental interference elimination data pre-entered by the user, the processing flow is as follows: Obtaining historical environmental interference information, and obtaining multiple estimated environmental interference time periods based on the historical environmental interference information; During the estimated environmental interference period, multiple phase current monitoring information is optimized and adjusted based on the environmental interference amount information obtained and the magnetic field current interference information and noise interference information in the environmental interference elimination data.

2. The device according to claim 1, characterized in that: The fault line selection module includes a three-phase contactor and an impedance grounding transformer, the three-phase input ends of the three-phase contactor are respectively connected to the three-phase output lines of the front circuit breaker, the output ends of the three-phase contactor are connected to the three-phase input ends of the impedance grounding transformer, and the neutral point of the impedance grounding transformer is grounded; A second current transformer is installed on the grounding line of the impedance grounding transformer.

3. The device according to claim 2, 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 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 arc-extinguishing phase circuit breaker, the arc-extinguishing switch and the three-phase contactor according to the current monitoring information.

4. A main controller of a phase misplacement type grounding treatment device, characterized in that: The main controller includes an information acquisition module and an information determination module; The information acquisition module and the information identification module cyclically execute the following steps until, during the cyclic processing, all the phase switches in the phase circuit breaker are in an over-closed state or the arc extinguishing switch is closed: An information acquisition module is used to control the closing of the corresponding phase switch in the phase circuit breaker according to the phase current monitoring information on the three-phase line of the distribution system busbar acquired in real time; An information determination module, configured to receive the phase selection current feedback information fed back by the first current transformer, and generate phase selection determination 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 be closed; If there is an error mark in the phase selection judgment information, disconnecting the closed phase switch in the phase circuit breaker; The information acquisition module 301 is used to acquire the fault identification record data recorded in the storage database, where the fault identification record data includes a plurality of fault phase selection record information; The information identification module 302 is used to generate phase selection error probability and fault identification probability change information based on multiple fault phase selection record information, and compare the phase selection error probability with a preset error identification threshold; If the probability of phase selection error is greater than or equal to the error identification threshold, then the device self-check information is generated; If the probability of phase selection error is less than the error identification threshold, a conventional error category is generated; The data calculation and processing module 303 is used to obtain the current phase selection misjudgment probability within a preset evaluation time before the current moment according to the misidentification fault probability change information; The optimization and adjustment module 304 is used to match a corresponding target optimization and adjustment scheme from a plurality of preset optimization and adjustment schemes according to the current phase selection misjudgment probability, the misidentification fault probability change information and the preset misjudgment peak line threshold, wherein the plurality of optimization and adjustment schemes at least include environmental interference elimination, device component aging maintenance and device component replacement maintenance; Compare the current phase selection misjudgment probability with the preset misjudgment peak line threshold, and classify the current phase selection misjudgment probability into a redundant adjustment type or an urgent adjustment type; If the current phase selection misjudgment information belongs to the redundant adjustment type, a slow increase mark or a steep increase mark is added to the device self-test information according to the misidentification fault probability change information and the preset misjudgment growth ratio; If the current phase selection misjudgment probability belongs to the urgent adjustment type, or the current phase selection misjudgment probability belongs to the redundant adjustment type and carries a steep increase flag, then the current environmental interference amount information at the current moment is obtained; According to the current environmental interference amount information and the preset environmental interference amount threshold, an excessive interference mark or a slight interference mark is added to the environmental interference amount information; If there is a trace interference mark in the environmental interference information, then the device component maintenance information is generated; If there is an excessive interference mark in the environmental interference amount information, the environmental interference elimination data pre-entered by the user is obtained, and multiple phase current monitoring information received in real time after the current moment is optimized and adjusted; Obtaining historical environmental interference information, and obtaining multiple estimated environmental interference time periods based on the historical environmental interference information; During the estimated environmental interference period, multiple phase current monitoring information is optimized and adjusted based on the environmental interference amount information obtained and the magnetic field current interference information and noise interference information in the environmental interference elimination data.

5. 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 the phase-misplacement type grounding treatment method as described in claim 1.

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