Power distribution automation equipment fault processing method and device, equipment and storage medium

Abstract

The invention provides a power distribution automation equipment fault processing method and device, equipment and a storage medium. The method comprises the following steps: respectively detecting whether an operation parameter of a power distribution fault of each priority level of a power distribution line suddenly changes or not and the time when the suddenly changes; recording the abrupt change moment of the operation parameter of the power distribution fault of each priority level as the abrupt change moment corresponding to the power distribution fault of the priority level; if at least one abrupt change moment corresponding to the power distribution fault with the high priority exists in a preset time period after the abrupt change moment corresponding to the power distribution fault with the low priority, determining a target abrupt change moment according to the abrupt change moment corresponding to each power distribution fault with the high priority; and judging and processing a power distribution fault of the power distribution line according to the target sudden change moment. According to the invention, the sudden change moment of the power distribution fault with high priority level can be accurately determined, so that the problem that the fault protection time is possibly influenced is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution fault processing, and in particular to a method, device, equipment and storage medium for processing faults of power distribution automation equipment. Background Art

[0002] Distribution automation equipment is a device that monitors, controls and quickly isolates faults in distribution networks. Common distribution line faults in distribution networks include ground faults and short circuit faults. The two faults may occur in combination or in sequence.

[0003] When a power distribution fault occurs, the corresponding voltage analog quantity and current analog quantity will mutate. Intelligent power distribution automation equipment will generally discard the analog quantity before the mutation according to the mutation moment, and calculate the analog quantity of one cycle (that is, one power frequency cycle) after the mutation in real time. If the calculated result is greater than the set value of the fault protection, the fault alarm signal will be reported or the line switch will be controlled to open to avoid further expansion of the fault. Therefore, it is particularly important to calculate the analog quantity in real time after the power distribution fault occurs. The key point to distinguish before and after the fault is the mutation moment of the analog quantity. If the mutation moment is incorrect, the analog quantity calculation of one cycle after the fault will be incorrect, and the alarm signal cannot be reported in time or the line switch cannot be controlled to open.

[0004] However, the inventors found that: since the judgment condition for the mutation quantity to start (i.e., mutation occurs) is: using the difference Y1 at the same position of the current cycle and the previous cycle, and the difference Y2 between the previous cycle and the previous two cycles, taking the absolute value of Y1 and Y2, and comparing the result Y3 with the mutation quantity constant, if Y3 is greater than the mutation quantity constant, it is considered that the mutation quantity is started, that is, a mutation occurs. And generally, multiple analog quantities of intelligent power distribution automation equipment share a mutation quantity start flag. That is to say, when it is determined that any analog quantity has a mutation, it is necessary to wait for 2 cycles before judging whether the analog quantity has a mutation again.

[0005] In this case, since the grounding fault is less harmful and is not a main protection fault, a delay is usually performed after the grounding fault is determined, and the fault alarm signal will not be reported until the delay expires. However, the phase-to-phase short-circuit fault is more harmful and is a main protection fault. Usually, no delay is performed after the phase-to-phase short-circuit fault is determined, and the line switch needs to be immediately controlled to open. At this time, if the grounding fault occurs first, and the interval between the grounding fault and the phase-to-phase short-circuit fault is less than 2 cycles, it will lead to the inability to determine the sudden change moment of the phase-to-phase short-circuit fault in time, resulting in the inability to immediately control the line switch to open after the phase-to-phase short-circuit fault occurs, resulting in the fault time being extended and the harm of the fault being expanded, which in turn causes the upper-level switch to bypass the adjustment, and the switch at this level refuses to operate, expanding the scope of the power outage. Summary of the invention

[0006] The embodiments of the present invention provide a distribution automation equipment fault handling method, device, equipment and storage medium to solve the problem that when distribution faults occur successively, the upper-level switch may trip and the current-level switch may refuse to operate, affecting the fault protection time.

[0007] In a first aspect, an embodiment of the present invention provides a method for handling a fault of a distribution automation device, comprising:

[0008] Respectively detect whether the operating parameters of each priority level of distribution fault of the distribution line have a sudden change and the time of the sudden change;

[0009] The moment when the operating parameters of each priority level of power distribution fault suddenly change is recorded as the sudden change moment corresponding to the power distribution fault of the priority level;

[0010] If there is at least one mutation moment corresponding to a high-priority power distribution fault within a preset period after the mutation moment corresponding to a low-priority power distribution fault, the target mutation moment is determined according to the mutation moments corresponding to the high-priority power distribution faults;

[0011] The power distribution fault of the power distribution line is judged and processed according to the target mutation moment.

[0012] In a possible implementation, the mutation time corresponding to the low priority power distribution fault is recorded as the first mutation time, and the mutation time corresponding to each high priority power distribution fault is recorded as the second mutation time;

[0013] The step of determining the target mutation time according to the mutation time corresponding to each high priority power distribution fault includes:

[0014] If all of the second mutation moments are within a first preset time period after the first mutation moment, the mutation moment corresponding to the power distribution fault with the highest priority among the second mutation moments is determined as the target mutation moment, and the first preset time period is less than the preset time period;

[0015] If each of the second mutation moments is after a first preset period of time after the first mutation moment, the first mutation moment is determined as the first target mutation moment, and the mutation moment corresponding to the power distribution fault with the highest priority among each of the second mutation moments is determined as the second target mutation moment;

[0016] If there is a second mutation moment within the first preset time period after the first mutation moment, and there is a second mutation moment after the first preset time period after the first mutation moment, the first target mutation moment is determined according to the second mutation moment within the first preset time period after the first mutation moment, and the second target mutation moment is determined according to the second mutation moment after the first preset time period after the first mutation moment.

[0017] In a possible implementation, after recording the time when the operating parameters of each priority level of the power distribution fault suddenly change as the sudden change time corresponding to the power distribution fault of the priority level, the method further includes:

[0018] If there is no mutation moment corresponding to a power distribution fault of another priority level within a preset period after the mutation moment corresponding to a power distribution fault of a certain priority level, the mutation moment corresponding to the power distribution fault of the priority level is used as the target mutation moment.

[0019] In a possible implementation, after recording the time when the operating parameters of each priority level of the power distribution fault suddenly change as the sudden change time corresponding to the power distribution fault of the priority level, the method further includes:

[0020] If there is at least one mutation moment corresponding to a low priority power distribution fault within a preset period after the mutation moment corresponding to a high priority power distribution fault, the mutation moment corresponding to the high priority power distribution fault is used as the target mutation moment.

[0021] In a possible implementation, judging and processing a power distribution fault of a power distribution line according to the target mutation time includes:

[0022] The power distribution fault corresponding to the target mutation time is recorded as the target power distribution fault, and the analog value of the operating parameter of the target power distribution fault within one power frequency cycle is calculated with the target mutation time as the starting point;

[0023] Comparing the analog value with the fault protection setting value of the target power distribution fault, and processing the target power distribution fault according to the comparison result;

[0024] Alternatively, the power distribution fault corresponding to the first target mutation moment is recorded as the first target power distribution fault, and the power distribution fault corresponding to the second target mutation moment is recorded as the second target power distribution fault, and the first target mutation moment is taken as the first starting point to calculate the first analog value of the operating parameter of the first target power distribution fault within a power frequency cycle, and the second target mutation moment is taken as the second starting point to calculate the second analog value of the operating parameter of the second target power distribution fault within a power frequency cycle;

[0025] Comparing the first analog quantity with the fault protection setting value of the first target power distribution fault, and processing the first target power distribution fault according to the comparison result;

[0026] The second analog quantity is compared with the fault protection setting of the second target power distribution fault, and the second target power distribution fault is processed according to the comparison result.

[0027] In a possible implementation, the power distribution fault includes a ground fault and a phase-to-phase short circuit fault; and the method includes:

[0028] Respectively detect whether the phase current, line voltage, zero-sequence voltage and zero-sequence current of the distribution line have sudden changes and the time when they occur;

[0029] If the zero-sequence voltage and / or the zero-sequence current suddenly changes, the moment when the zero-sequence voltage and / or the zero-sequence current suddenly changes is recorded as the sudden change moment corresponding to the ground fault;

[0030] If the phase current and / or the line voltage suddenly changes, the moment when the phase current and / or the line voltage suddenly changes is recorded as the sudden change moment corresponding to the phase-to-phase short circuit fault;

[0031] If the mutation moment corresponding to the interphase short circuit fault is within a preset period after the mutation moment corresponding to the ground fault, the mutation moment corresponding to the interphase short circuit fault is used as the target mutation moment;

[0032] Whether the interphase short circuit fault occurs in the distribution line is determined according to the target mutation moment, and the interphase short circuit fault occurring in the distribution line is processed according to the determination result.

[0033] In a possible implementation, the distribution automation equipment fault handling method further includes:

[0034] If there is no sudden change moment corresponding to other priority distribution faults within a preset period after the sudden change moment corresponding to the phase-to-phase short circuit fault, the sudden change moment corresponding to the phase-to-phase short circuit fault is used as the target sudden change moment;

[0035] Alternatively, if there is no sudden change moment corresponding to other priority level power distribution faults within a preset period after the sudden change moment corresponding to the ground fault, the sudden change moment corresponding to the ground fault is used as the target sudden change moment;

[0036] Alternatively, if the sudden change moment corresponding to the ground fault is within a preset time period after the sudden change moment corresponding to the inter-phase short-circuit fault, the sudden change moment corresponding to the inter-phase short-circuit fault is used as the target sudden change moment.

[0037] In a second aspect, an embodiment of the present invention provides a distribution automation equipment fault handling device, comprising:

[0038] A detection module, used to detect whether and when a sudden change occurs in the operating parameters of each priority level of the distribution line distribution fault;

[0039] A mutation time recording module, used for recording the time when the operating parameters of each priority level of power distribution fault suddenly change as the mutation time corresponding to the power distribution fault of the priority level;

[0040] A mutation moment determination module is used to determine a target mutation moment according to the mutation moments corresponding to the power distribution faults of the high priority levels if there is at least one mutation moment corresponding to the power distribution fault of the high priority level within a preset period after the mutation moment corresponding to the power distribution fault of the low priority level;

[0041] The fault processing module is used to judge and process the power distribution fault of the distribution line according to the target mutation moment.

[0042] In a third aspect, an embodiment of the present invention provides a distribution automation device, comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the steps of the method described in the first aspect or any possible implementation of the first aspect.

[0043] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect or any possible implementation method of the first aspect are implemented.

[0044] An embodiment of the present invention provides a distribution automation equipment fault handling method, apparatus, device and storage medium, which respectively detects whether the operating parameters of each priority level of distribution fault of the distribution line have a sudden change and the time of the sudden change, and records the time when the operating parameters of each priority level of distribution fault have a sudden change as the mutation time corresponding to the distribution fault of that priority level; further, if there is at least one mutation time corresponding to a high priority level of distribution fault within a preset time period after the mutation time corresponding to a low priority level of distribution fault, then the target mutation time is determined according to the mutation time corresponding to each high priority level of distribution fault, and the distribution fault of the distribution line is judged and processed according to the target mutation time. Therefore, by separately recording the mutation moment of each priority level of distribution fault and comparing the priority levels, the target mutation moment is determined from the mutation moments of high priority level distribution faults to give priority to judging and processing the high priority level distribution faults, thereby avoiding the problem that when a high priority level distribution fault occurs within a preset time period (that is, within 2 cycles) after a low priority level distribution fault, the mutation moment of the high priority level distribution fault cannot be determined in time, which leads to the over-adjustment of the upper level switch, the switch at this level refuses to operate, affecting the fault protection time, and expanding the scope of power outage. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative labor.

[0046] Figure 1 It is a flow chart of the implementation of the method for handling power distribution automation equipment faults provided by an embodiment of the present invention;

[0047] Figure 2 is a flow chart of a method for handling a fault of a power distribution automation device provided by another embodiment of the present invention;

[0048] Figure 3 It is a schematic diagram of the sudden change of each analog quantity when a ground fault and an interphase short circuit fault are provided in an embodiment of the present invention;

[0049] Figure 4 It is a structural schematic diagram of a distribution automation equipment fault handling device provided by an embodiment of the present invention;

[0050] Figure 5 It is a schematic diagram of a power distribution automation device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0052] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0053] Common faults in distribution lines include ground faults and short circuit faults, which may occur in combination or in sequence.

[0054] When a fault occurs, the corresponding voltage analog quantity and current analog quantity will suddenly change. Intelligent distribution automation equipment will generally discard the analog quantity before the mutation according to the mutation moment, and calculate the analog quantity of one cycle after the mutation in real time. If the calculated result is greater than the set value of the fault protection, the fault alarm signal will be reported or the line switch will be controlled to open to avoid further expansion of the fault. Therefore, real-time and accurate calculation of the analog quantity after the fault occurs is particularly important. The key point to distinguish before and after the fault is the mutation moment of the analog quantity. If the mutation moment is incorrectly found, the analog quantity of one cycle after the fault will be calculated incorrectly, and the alarm signal will not be reported or the line switch will not be controlled to open in time.

[0055] The judgment of the mutation moment (that is, the judgment of the mutation start) has two purposes: the first is to discard the previous point, and the second is to use this moment as the starting point to start the calculation of a cycle.

[0056] The existing intelligent distribution automation equipment voltage, zero-sequence voltage, phase current, and zero-sequence current share the mutation start flag. When any fault occurs, after any analog mutation is started, it is necessary to wait for 2 cycles to return before the mutation will be started again. At this time, if a phase-to-phase short circuit fault occurs within 2 cycles after the ground fault occurs, the local switch will refuse to operate and the upper switch will trip, thereby affecting the action time of the main fault protection and expanding the scope of the power outage.

[0057] Among them, after any simulation mutation is started, it is necessary to wait for 2 cycles to return before the mutation is started again, because:

[0058] The calculation of mutation quantity uses the difference Y1 of the same position between the current cycle and the previous cycle, and the difference Y2 between the previous cycle and the two previous cycles. The result Y3 obtained by taking the absolute value of the difference between Y1 and Y2 is compared with the mutation quantity constant. If the difference Y3 is greater than the mutation constant, it is considered a mutation. Therefore, this calculation method causes the minimum frequency number of the mutation quantity returned to be 2, that is, the minimum frequency number for re-judging whether the simulation quantity has a mutation is 2.

[0059] On this basis, if an interphase short circuit fault occurs within 2 cycles after a ground fault occurs, since the power distribution fault is mainly composed of ground fault and interphase fault (interphase short circuit fault), and the ground fault is the auxiliary protection, the switch will be operated after the fault is determined to be delayed, while the interphase fault is the main protection, and the switch will not be delayed (that is, delayed by 0S) after the fault is determined to be.

[0060] The existing intelligent power distribution automation equipment uses a common mutation start flag for voltage, zero-sequence voltage, phase current, and zero-sequence current. After any analog mutation is started, it is necessary to wait for 2 cycles to return before the mutation is started again. If the phase-to-phase fault delay is 0s, the switch will act immediately without any impact. If the phase-to-phase fault delay is greater than 2 cycles, and a ground fault occurs within 2 cycles, the ground fault mutation is not started because the interval between the two faults is less than 2 cycles. However, the ground fault is an auxiliary protection (i.e., the switch action protection is performed only after the delay is reached), so the failure of the mutation to start will not affect the action time of the main protection (i.e., the phase-to-phase fault). After the delay of the main protection is reached, the switch will act.

[0061] After a ground fault (the auxiliary protection is put into the alarm control word, and only an alarm is given but no tripping occurs after the fault occurs), a phase-to-phase fault occurs within 2 cycles (the main protection is put into the trip control word, and tripping is required after the fault occurs). Since the interval between the two faults is less than 2 cycles, the sudden change of the phase-to-phase fault is not activated, and the phase-to-phase fault is the main protection (i.e., the delay 0s switch action protection), the sudden change of the phase-to-phase fault is not activated, which will cause the switch to not receive the opening signal, causing the local switch to refuse to operate, resulting in the upper-level switch tripping and expanding the scope of the power outage.

[0062] That is, after the ground fault, the zero-sequence voltage or zero-sequence current first changes suddenly, and the sudden change time is determined based on the sudden change of the zero-sequence voltage or zero-sequence current. If a phase-to-phase fault occurs within two cycles thereafter, the sudden change of the voltage or current after the phase-to-phase fault will not be determined again, and the starting point of the analog sudden change will not be re-determined, which will lead to the inability to accurately find the starting point of the analog sudden change during the phase-to-phase fault. Moreover, if the starting point of the analog sudden change is not re-determined, the analog point before the phase-to-phase fault will not be discarded, which will cause the analog calculation time to be later than the actual fault time, resulting in the calculation of analog data of one cycle after the actual fault. When the starting point of the analog calculation is inaccurate or the analog calculation time is late, if the calculation result does not meet the setting value greater than the phase-to-phase fault protection, the phase-to-phase fault cannot be determined. In addition, since the harm of the ground fault is small, it is not the main protection, and the fault has a delay. After the ground fault is determined, a delay is performed. After the delay is reached, the device will report the fault alarm signal. The harm of the phase-to-phase fault is large, which is the main protection, and the fault delay is 0s. If an interphase short circuit fault occurs within 2 cycles after the ground fault, the interphase short circuit fault cannot immediately control the line switch to open, causing the fault time to be prolonged and the fault damage to be expanded, thus causing the upper-level switch to over-adjust and the current-level switch to refuse to operate, expanding the scope of the power outage.

[0063] Therefore, the embodiment of the present invention mainly solves the problem that the first fault is a general fault, the delay is set to non-0s, and the alarm control word is put into use, and the tripping control word is not put into use. At this time, a major fault occurs within 2 cycles, the major fault delay is 0s, and the tripping control word is put into use. In this case, the second fault mutation amount of the two faults within an interval of 2 cycles will not be activated, resulting in inaccurate judgment of the mutation time, thereby affecting the action time of the main protection.

[0064] See also Figure 1 , which shows a flow chart of the implementation of the method for handling a fault of a distribution automation device provided by an embodiment of the present invention, and is described in detail as follows:

[0065] In step 101, it is respectively detected whether the operating parameters of each priority level of the distribution fault of the distribution line have a sudden change and the time when the sudden change occurs.

[0066] Exemplarily, the power distribution fault may include a ground fault and a phase-to-phase short circuit fault.

[0067] Accordingly, combined Figure 2 , step 101 may be:

[0068] Detect whether the phase current, line voltage, zero-sequence voltage and zero-sequence current of the distribution line have sudden changes and the time when the sudden changes occur.

[0069] like Figure 3As shown, the phase voltage mutation does not have fault directionality and does not meet the conditions for fault identification. It is different from ground fault and phase-to-phase fault. Ground fault is mainly identified by zero-sequence voltage and zero-sequence current mutations, and phase-to-phase fault is mainly identified by phase current and line voltage mutations.

[0070] Therefore, based on the difference in the types of sudden changes when ground faults and phase-to-phase faults occur in the distribution network, the phase current and line voltage are defined as having the same priority (higher priority, line main protection, characterizing phase-to-phase faults), and the zero-sequence voltage and zero-sequence current are defined as having the same priority (general priority, line auxiliary protection, characterizing ground faults). This allows the subsequent sudden change moment of each priority level of distribution fault to be recorded separately, and an independent sudden change start mark is used to record the time when the sudden change occurs. The starting point of the analog sudden change is then independently determined based on the difference in sudden change types caused by the fault type and the corresponding sudden change moment, so that the fault type can be quickly and independently determined, and the switch can be controlled to trip and remove the fault in time, avoiding the situation where the main fault of the trip control word occurs within 2 cycles after the general fault of the alarm control word is put into operation, causing the switch to refuse to operate.

[0071] In step 102, the moment when the operating parameters of each priority level of the power distribution fault suddenly change is recorded as the sudden change moment corresponding to the power distribution fault of the priority level.

[0072] Exemplarily, when the power distribution fault includes a ground fault and a phase-to-phase short circuit fault, step 102 may be:

[0073] If the zero-sequence voltage and / or the zero-sequence current suddenly changes, the moment when the zero-sequence voltage and / or the zero-sequence current suddenly changes is recorded as the sudden change moment corresponding to the ground fault.

[0074] If a sudden change occurs in the phase current and / or the line voltage, the moment when the sudden change occurs in the phase current and / or the line voltage is recorded as the sudden change moment corresponding to the phase-to-phase short circuit fault.

[0075] In step 103, if there is at least one mutation moment corresponding to a high priority power distribution fault within a preset period after the mutation moment corresponding to a low priority power distribution fault, the target mutation moment is determined according to the mutation moments corresponding to the high priority power distribution faults.

[0076] Optionally, the mutation moment corresponding to the low-priority power distribution fault is recorded as the first mutation moment, and the mutation moment corresponding to each high-priority power distribution fault is recorded as the second mutation moment.

[0077] Accordingly, determining the target mutation time according to the mutation time corresponding to each high priority power distribution fault may include:

[0078] If all second mutation moments are within a first preset time period after the first mutation moment, the mutation moment corresponding to the power distribution fault with the highest priority among the second mutation moments is determined as the target mutation moment, and the first preset time period is less than the preset time period.

[0079] If each second mutation moment is after a first preset period after the first mutation moment, the first mutation moment is determined as the first target mutation moment, and the mutation moment corresponding to the power distribution fault with the highest priority among the second mutation moments is determined as the second target mutation moment.

[0080] If there is a second mutation moment within the first preset time period after the first mutation moment, and there is a second mutation moment after the first preset time period after the first mutation moment, the first target mutation moment is determined according to the second mutation moment within the first preset time period after the first mutation moment, and the second target mutation moment is determined according to the second mutation moment after the first preset time period after the first mutation moment.

[0081] Exemplarily, the first preset time period may be half a cycle, the preset time period may be 2 cycles, and in this embodiment, the time when the sudden change moment of the high priority level distribution fault occurs within the preset time period after the sudden change moment corresponding to the low priority level distribution fault is further considered.

[0082] If the mutation moment of a high-priority distribution fault occurs earlier, for example, within half a cycle after the mutation moment corresponding to a low-priority distribution fault, the mutation moment corresponding to the low-priority distribution fault can be directly discarded, and the mutation moment of the high-priority distribution fault can be used as the new starting point for fault judgment and processing.

[0083] If the mutation moment of a high-priority distribution fault occurs later, for example, half a cycle after the mutation moment corresponding to a low-priority distribution fault, the mutation moment corresponding to the low-priority distribution fault can be retained, and a new mutation moment can be recorded according to the mutation moment of the high-priority distribution fault that occurs half a cycle later, that is, a first target mutation moment and a second target mutation moment are determined. This reduces the impact of a high-priority distribution fault that occurs later on the processing of a low-priority distribution fault that occurs earlier.

[0084] Exemplarily, when the power distribution fault includes a ground fault and a phase-to-phase short circuit fault, step 103 may be:

[0085] If the mutation moment corresponding to the phase-to-phase short circuit fault is within a preset period after the mutation moment corresponding to the ground fault, the mutation moment corresponding to the phase-to-phase short circuit fault is used as the target mutation moment.

[0086] Specifically, if the sudden change moment corresponding to the phase-to-phase short circuit fault is within a first preset time period after the sudden change moment corresponding to the ground fault, the sudden change moment corresponding to the phase-to-phase short circuit fault is used as the target sudden change moment.

[0087] If the mutation moment corresponding to the phase-to-phase short circuit fault is after the first preset period of time after the mutation moment corresponding to the ground fault, the mutation moment corresponding to the ground fault is used as the first target mutation moment, and the mutation moment corresponding to the phase-to-phase short circuit fault is used as the second target mutation moment.

[0088] In this embodiment, if the zero-sequence voltage or zero-sequence current mutation starts first and the alarm control word is put into use, that is, the ground fault occurs first and the alarm control word is put into use, the mutation amount start time is determined according to the mutation moment of the zero-sequence voltage or zero-sequence current, and the mutation amount start time (that is, the mutation moment corresponding to the ground fault) is used as the starting point of the analog quantity calculation, and the starting point of the fault cycle analog quantity calculation will not be re-recorded. Then the ground fault is judged, and the alarm fault is reported when the delay set by the protection logic is reached.

[0089] If the sudden change of the ground fault starts and the phase current or line voltage starts again within the half cycle (i.e. within the first preset period), that is, a phase-to-phase fault occurs within the half cycle, at this time, due to the sudden change of the phase current or line voltage within the half cycle, the point is adjusted again (i.e., the starting point of the analog quantity calculation is determined again). At this time, the first ground fault is a general fault, and the delay time of the ground fault is long enough relative to the time of the half cycle. The later phase-to-phase fault is the main fault and has a higher priority. Therefore, the first ground fault is abandoned, and the analog quantity calculation point is adjusted only according to the sudden change of the later phase-to-phase fault (i.e., the sudden change of the phase-to-phase fault is used as the starting point of the analog quantity calculation). Then the phase-to-phase fault judgment is performed, and the calculation result is compared with the set value of the phase-to-phase fault protection to determine the fault state. When the delay condition set by the protection logic is reached (the delay is rarely set in actual operation, and 0S action is generally adopted), the alarm information is reported or the switch tripping is processed according to the corresponding protection control word.

[0090] If the phase current or line voltage mutation quantity starts again half a cycle after the ground fault mutation quantity starts (i.e. after the first preset period), that is, a phase-to-phase fault occurs after half a cycle, at this time, the mutation moment of the ground fault is used as the starting point of an analog quantity calculation, and an analog quantity calculation is performed, and the newly added "voltage and current mutation flag after zero-sequence mutation" is set, and the current sampling position is recorded, that is, the mutation moment of the phase-to-phase fault is also used as the starting point of an analog quantity calculation. When the sampling from the sampling position meets one cycle, the analog quantity calculation is performed again, and the starting point of the fault cycle analog quantity calculation will not be recorded again. Then the ground fault judgment and the phase-to-phase fault judgment are performed respectively. That is, the calculation result is compared with the set value of the ground fault protection to determine the fault state. When the protection logic delay arrives, the alarm information is reported or the switch trips according to the corresponding protection control word. And the calculation result is compared with the set value of the phase-to-phase fault protection to determine the fault state. When the protection logic setting delay condition arrives (the delay is rarely set in actual operation, and 0S action is generally adopted), the alarm information is reported or the switch trips according to the corresponding protection control word.

[0091] In step 104, the power distribution fault of the distribution line is judged and processed according to the target mutation time.

[0092] Exemplarily, when the power distribution fault includes a ground fault and a phase-to-phase short circuit fault, step 104 may be:

[0093] Whether a phase-to-phase short circuit fault occurs in the distribution line is determined according to the target mutation moment, and the phase-to-phase short circuit fault occurring in the distribution line is processed according to the determination result.

[0094] Optionally, judging and processing the distribution fault of the distribution line according to the target mutation moment may include: recording the distribution fault corresponding to the target mutation moment as the target distribution fault, taking the target mutation moment as the starting point, calculating the analog value of the operating parameters of the target distribution fault within one power frequency cycle; comparing the analog value with the fault protection constant of the target distribution fault, and processing the target distribution fault according to the comparison result.

[0095] Alternatively, the distribution fault corresponding to the first target mutation moment is recorded as the first target distribution fault, and the distribution fault corresponding to the second target mutation moment is recorded as the second target distribution fault. Taking the first target mutation moment as the first starting point, the first analog value of the operating parameters of the first target distribution fault within one power frequency cycle is calculated, and taking the second target mutation moment as the second starting point, the second analog value of the operating parameters of the second target distribution fault within one power frequency cycle is calculated; the first analog value is compared with the fault protection constant of the first target distribution fault, and the first target distribution fault is processed according to the comparison result; the second analog value is compared with the fault protection constant of the second target distribution fault, and the second target distribution fault is processed according to the comparison result.

[0096] Among them, the protection logic of faults in distribution line protection is generally protection control word input (protection control word is alarm or trip) and delay judgment. When a fault occurs, the mutation quantity produces a mutation, calculates the analog quantity, and then starts the protection according to the fault characteristics, delays the reporting of alarm signals or tripping output actions (that is, the switch trips and directly removes the fault).

[0097] In this embodiment, the distribution fault of the distribution line is judged and processed according to the target mutation time, that is:

[0098] After the zero-sequence voltage or zero-sequence current suddenly changes for one cycle, the zero-voltage and zero-current sudden change sampling full cycle flag is set, the analog quantity is calculated once, and then the zero-current and zero-voltage related logic is processed once to identify the grounding fault.

[0099] After the phase current or line voltage changes suddenly for a full cycle, the line voltage and phase current sudden change sampling full cycle flag is set, the analog quantity is calculated once, and then the phase current and line voltage related logic is processed once to identify the phase-to-phase fault.

[0100] In one embodiment, after recording the moment when the operating parameters of each priority level of the power distribution fault suddenly change as the sudden change moment corresponding to the power distribution fault of the priority level, the method may further include:

[0101] If there is no mutation moment corresponding to a power distribution fault of another priority level within a preset period after the mutation moment corresponding to a power distribution fault of a certain priority level, the mutation moment corresponding to the power distribution fault of the priority level is used as the target mutation moment.

[0102] Exemplarily, when the power distribution fault includes a ground fault and a phase-to-phase short circuit fault, if there is no mutation moment corresponding to a power distribution fault of other priority levels within a preset time period after the mutation moment corresponding to the phase-to-phase short circuit fault, the mutation moment corresponding to the phase-to-phase short circuit fault will be used as the target mutation moment.

[0103] Alternatively, if there is no sudden change moment corresponding to a power distribution fault of other priority levels within a preset period after the sudden change moment corresponding to the ground fault, the sudden change moment corresponding to the ground fault is used as the target sudden change moment.

[0104] In this embodiment, if only the phase current or line voltage starts suddenly, that is, only the phase-to-phase fault occurs, the analog quantity calculation adjustment point is performed according to the start time of the sudden change of the phase current or line voltage (that is, the sudden change time corresponding to the phase-to-phase fault), and the starting point of the fault cycle analog quantity calculation will not be re-recorded. Then the phase-to-phase fault judgment is performed, and when the delay condition set by the protection logic is reached (the delay is rarely set in actual operation, and generally 0S action is adopted), the alarm information is reported or the switch tripping is processed according to the input of the corresponding protection control word.

[0105] If only the zero-sequence voltage or zero-sequence current starts suddenly, that is, only a ground fault occurs, the analog calculation adjustment point is performed according to the start time of the zero-sequence voltage or zero-sequence current sudden change (that is, the sudden change time corresponding to the ground fault), and the starting point of the fault cycle analog calculation will not be re-recorded. Then the ground fault is judged, and when the protection logic delay arrives, the alarm information is reported or the switch trips according to the corresponding protection control word.

[0106] The fault protection logic of this embodiment has not changed, but because the phase-to-phase fault is judged based solely on the phase current or line voltage, or the grounding fault is judged based solely on the zero-sequence voltage or zero-sequence current, the fault judgment speed is increased to twice that of the common mutation start mark, which greatly improves the fault judgment speed.

[0107] In one embodiment, after recording the moment when the operating parameters of each priority level of the power distribution fault suddenly change as the sudden change moment corresponding to the power distribution fault of the priority level, the method may further include:

[0108] If there is at least one mutation moment corresponding to a low priority power distribution fault within a preset period after the mutation moment corresponding to a high priority power distribution fault, the mutation moment corresponding to the high priority power distribution fault is used as the target mutation moment.

[0109] Exemplarily, when the power distribution fault includes a ground fault and a phase-to-phase short circuit fault, if the mutation moment corresponding to the ground fault is within a preset period after the mutation moment corresponding to the phase-to-phase short circuit fault, the mutation moment corresponding to the phase-to-phase short circuit fault is used as the target mutation moment.

[0110] In this embodiment, if the phase current or line voltage suddenly starts first, and the protection control word is an alarm control word, that is, a phase-to-phase fault occurs first and the alarm control word is put into use (an alarm signal is reported when a fault occurs), then the analog quantity calculation adjustment point is performed according to the start time of the sudden change of the phase current or line voltage, and the starting point of the fault cycle analog quantity calculation will not be re-recorded. Then the fault situation is judged, and the alarm signal is reported after the delay set by the protection logic system arrives. In this process, before the sudden change returns, if the zero-sequence voltage or zero-sequence current suddenly starts again, since the main protection has a higher priority, the ground fault judgment can be directly performed according to the protection logic without additional processing.

[0111] According to the fault type of the power distribution fault, this embodiment divides the total mutation judgment into: zero-sequence voltage, zero-sequence current mutation and phase current, line voltage mutation. Phase current, line voltage, zero-sequence voltage, and zero-sequence current are judged independently. After each mutation, only the mutation moment is recorded without adjustment. Then the priority is established, and the analog quantity calculation adjustment is performed according to the priority order. This solves the problem that when different types of faults in the distribution network line are converted, the switch at this level refuses to operate, the fault time is extended, the fault hazard is expanded, the upper switch trips across the level, and the power outage range is expanded.

[0112] The embodiment of the present invention detects whether the operating parameters of each priority level of the distribution fault of the distribution line have a sudden change and the moment of the sudden change, and records the moment when the operating parameters of each priority level of the distribution fault have a sudden change as the sudden change moment corresponding to the distribution fault of the priority level; and then if there is at least one sudden change moment corresponding to a high priority level of the distribution fault within the preset time period after the sudden change moment corresponding to the low priority level of the distribution fault, the target sudden change moment is determined according to the sudden change moment corresponding to each high priority level of the distribution fault, and the distribution fault of the distribution line is judged and processed according to the target sudden change moment. Thus, by separately recording the sudden change moment of the distribution fault of each priority level and comparing the priority level, the target sudden change moment is determined from the sudden change moment of the distribution fault of the high priority level to judge and process the distribution fault of the high priority level first, thereby avoiding the problem that the sudden change moment of the distribution fault of the high priority level cannot be determined in time when the distribution fault of the high priority level occurs within the preset time period (that is, within 2 cycles) after the distribution fault of the low priority level, thereby causing the upper level switch to bypass the gate, the switch of the current level refuses to move, affecting the fault protection time, and expanding the scope of power outage.

[0113] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0114] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0115] Figure 4 The structure diagram of the power distribution automation equipment fault handling device provided by the embodiment of the present invention is shown. For the convenience of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0116] like Figure 4 As shown, the distribution automation equipment fault processing device includes: a detection module 41, a mutation time recording module 42, a mutation time determination module 43 and a fault processing module 44.

[0117] A detection module 41 is used to detect whether the operating parameters of each priority level of the distribution line distribution fault have a sudden change and the time of the sudden change;

[0118] A mutation time recording module 42, used for recording the time when the operating parameters of each priority level of power distribution fault suddenly change as the mutation time corresponding to the power distribution fault of the priority level;

[0119] A mutation moment determination module 43 is used to determine a target mutation moment according to the mutation moments corresponding to the power distribution faults of the high priority levels if there is at least one mutation moment corresponding to the power distribution fault of the high priority level within a preset period after the mutation moment corresponding to the power distribution fault of the low priority level;

[0120] The fault processing module 44 is used to judge and process the power distribution fault of the power distribution line according to the target mutation moment.

[0121] The embodiment of the present invention detects whether the operating parameters of each priority level of the distribution fault of the distribution line have a sudden change and the moment of the sudden change, and records the moment when the operating parameters of each priority level of the distribution fault have a sudden change as the sudden change moment corresponding to the distribution fault of the priority level; and then if there is at least one sudden change moment corresponding to a high priority level of the distribution fault within the preset time period after the sudden change moment corresponding to the low priority level of the distribution fault, the target sudden change moment is determined according to the sudden change moment corresponding to each high priority level of the distribution fault, and the distribution fault of the distribution line is judged and processed according to the target sudden change moment. Thus, by separately recording the sudden change moment of the distribution fault of each priority level and comparing the priority level, the target sudden change moment is determined from the sudden change moment of the distribution fault of the high priority level to judge and process the distribution fault of the high priority level first, thereby avoiding the problem that the sudden change moment of the distribution fault of the high priority level cannot be determined in time when the distribution fault of the high priority level occurs within the preset time period (that is, within 2 cycles) after the distribution fault of the low priority level, thereby causing the upper level switch to bypass the gate, the switch of the current level refuses to move, affecting the fault protection time, and expanding the scope of power outage.

[0122] In a possible implementation, the mutation moment corresponding to a low-priority distribution fault is recorded as the first mutation moment, and the mutation moment corresponding to each high-priority distribution fault is recorded as the second mutation moment; the mutation moment determination module 43 can be used to determine the mutation moment corresponding to the distribution fault with the highest priority among each of the second mutation moments as the target mutation moment if each of the second mutation moments is within a first preset time period after the first mutation moment, and the first preset time period is less than the preset time period; if each of the second mutation moments is after the first preset time period after the first mutation moment, the first mutation moment is determined as the first target mutation moment, and the mutation moment corresponding to the distribution fault with the highest priority among each of the second mutation moments is determined as the second target mutation moment; if there is a second mutation moment within the first preset time period after the first mutation moment, and there is a second mutation moment after the first preset time period after the first mutation moment, the first target mutation moment is determined according to the second mutation moment within the first preset time period after the first mutation moment, and the second target mutation moment is determined according to the second mutation moment after the first preset time period after the first mutation moment.

[0123] In one possible implementation, the mutation moment determination module 43 may also be used to use the mutation moment corresponding to a power distribution fault of a certain priority level as the target mutation moment if there is no mutation moment corresponding to a power distribution fault of another priority level within a preset period after the mutation moment corresponding to the power distribution fault of the priority level.

[0124] In one possible implementation, the mutation moment determination module 43 can also be used to use the mutation moment corresponding to a high priority power distribution fault as the target mutation moment if there is at least one mutation moment corresponding to a low priority power distribution fault within a preset time period after the mutation moment corresponding to a high priority power distribution fault.

[0125] In a possible implementation, the fault processing module 44 can be used to record the distribution fault corresponding to the target mutation moment as the target distribution fault, and calculate the analog value of the operating parameters of the target distribution fault within one power frequency cycle with the target mutation moment as the starting point; compare the analog value with the fault protection constant of the target distribution fault, and process the target distribution fault according to the comparison result; or, record the distribution fault corresponding to the first target mutation moment as the first target distribution fault, and record the distribution fault corresponding to the second target mutation moment as the second target distribution fault, and calculate the first analog value of the operating parameters of the first target distribution fault within one power frequency cycle with the first target mutation moment as the first starting point, and calculate the second analog value of the operating parameters of the second target distribution fault within one power frequency cycle with the second target mutation moment as the second starting point; compare the first analog value with the fault protection constant of the first target distribution fault, and process the first target distribution fault according to the comparison result; compare the second analog value with the fault protection constant of the second target distribution fault, and process the second target distribution fault according to the comparison result.

[0126] In a possible implementation, the distribution fault includes a ground fault and an interphase short circuit fault; the detection module 41 can be used to respectively detect whether the phase current, line voltage, zero-sequence voltage, and zero-sequence current of the distribution line have a sudden change and the time of the sudden change; the sudden change moment recording module 42 can be used to record the time when the zero-sequence voltage and / or the zero-sequence current have a sudden change as the sudden change moment corresponding to the ground fault; if the phase current and / or the line voltage have a sudden change, the time when the phase current and / or the line voltage have a sudden change is recorded as the sudden change moment corresponding to the interphase short circuit fault; the sudden change moment determination module 43 can be used to take the sudden change moment corresponding to the interphase short circuit fault as the target sudden change moment if the sudden change moment corresponding to the interphase short circuit fault is within a preset time period after the sudden change moment corresponding to the ground fault; the fault processing module 44 can be used to determine whether the interphase short circuit fault has occurred in the distribution line according to the target sudden change moment, and process the interphase short circuit fault occurring in the distribution line according to the determination result.

[0127] In a possible implementation, the mutation moment determination module 43 may also be used to take the mutation moment corresponding to the phase-to-phase short circuit fault as the target mutation moment if there is no mutation moment corresponding to other power distribution faults of priority levels within a preset period after the mutation moment corresponding to the phase-to-phase short circuit fault; or, if there is no mutation moment corresponding to other power distribution faults of priority levels within a preset period after the mutation moment corresponding to the ground fault, take the mutation moment corresponding to the ground fault as the target mutation moment. Or, if the mutation moment corresponding to the ground fault is within a preset period after the mutation moment corresponding to the phase-to-phase short circuit fault, take the mutation moment corresponding to the phase-to-phase short circuit fault as the target mutation moment.

[0128] Figure 5 Schematic diagram of the power distribution automation equipment provided by the embodiment of the present invention. Figure 5 As shown, the distribution automation device 5 of this embodiment includes: a processor 50, a memory 51, and a computer program 52 stored in the memory 51 and executable on the processor 50. When the processor 50 executes the computer program 52, the steps in the above-mentioned various distribution automation device fault handling method embodiments are implemented, such as Figure 1 Steps 101 to 104 shown, or Figure 2 Alternatively, when the processor 50 executes the computer program 52, the functions of each module / unit in the above-mentioned device embodiments are realized, for example Figure 4 The functions of each module are shown.

[0129] Exemplarily, the computer program 52 may be divided into one or more modules / units, one or more modules / units are stored in the memory 51, and are executed by the processor 50 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments that can implement specific functions, and the instruction segments are used to describe the execution process of the computer program 52 in the distribution automation device 5. For example, the computer program 52 may be divided into Figure 4 The modules shown.

[0130] The power distribution automation device 5 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The power distribution automation device 5 may include, but is not limited to, a processor 50 and a memory 51. Those skilled in the art will appreciate that Figure 5 It is only an example of the distribution automation equipment 5 and does not constitute a limitation of the distribution automation equipment 5. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the distribution automation equipment may also include input and output devices, network access equipment, buses, etc.

[0131] The processor 50 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0132] The memory 51 may be an internal storage unit of the distribution automation device 5, such as a hard disk or memory of the distribution automation device 5. The memory 51 may also be an external storage device of the distribution automation device 5, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the distribution automation device 5. Further, the memory 51 may also include both an internal storage unit and an external storage device of the distribution automation device 5. The memory 51 is used to store computer programs and other programs and data required by the distribution automation device. The memory 51 may also be used to temporarily store data that has been output or is to be output.

[0133] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0134] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0135] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0136] In the embodiments provided by the present invention, it should be understood that the disclosed device / distribution automation equipment and method can be implemented in other ways. For example, the device / distribution automation equipment embodiments described above are only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0137] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0138] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0139] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various distribution automation equipment fault handling method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0140] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A method for handling faults of distribution automation equipment, characterized in that: include: Respectively detect whether the operating parameters of each priority level of distribution fault of the distribution line have a sudden change and the time of the sudden change; The moment when the operating parameters of each priority level of power distribution fault suddenly change is recorded as the sudden change moment corresponding to the power distribution fault of the priority level; If there is at least one mutation moment corresponding to a high-priority power distribution fault within a preset period after the mutation moment corresponding to a low-priority power distribution fault, the target mutation moment is determined according to the mutation moments corresponding to the high-priority power distribution faults; The power distribution fault of the power distribution line is judged and processed according to the target mutation moment.

2. The method for handling faults of distribution automation equipment according to claim 1, characterized in that: The mutation time corresponding to the low priority power distribution fault is recorded as the first mutation time, and the mutation time corresponding to each high priority power distribution fault is recorded as the second mutation time; The step of determining the target mutation time according to the mutation time corresponding to each high priority power distribution fault includes: If all of the second mutation moments are within a first preset time period after the first mutation moment, the mutation moment corresponding to the power distribution fault with the highest priority among the second mutation moments is determined as the target mutation moment, and the first preset time period is less than the preset time period; If each of the second mutation moments is after a first preset period of time after the first mutation moment, the first mutation moment is determined as the first target mutation moment, and the mutation moment corresponding to the power distribution fault with the highest priority among each of the second mutation moments is determined as the second target mutation moment; If there is a second mutation moment within the first preset time period after the first mutation moment, and there is a second mutation moment after the first preset time period after the first mutation moment, the first target mutation moment is determined according to the second mutation moment within the first preset time period after the first mutation moment, and the second target mutation moment is determined according to the second mutation moment after the first preset time period after the first mutation moment.

3. The method for handling faults of distribution automation equipment according to claim 1, characterized in that: After recording the moment when the operating parameters of each priority level of the power distribution fault suddenly change as the sudden change moment corresponding to the power distribution fault of the priority level, the method further includes: If there is no mutation moment corresponding to a power distribution fault of another priority level within a preset period after the mutation moment corresponding to a power distribution fault of a certain priority level, the mutation moment corresponding to the power distribution fault of the priority level is used as the target mutation moment.

4. The method for handling power distribution automation equipment faults according to claim 1, characterized in that: After recording the moment when the operating parameters of each priority level of the power distribution fault suddenly change as the sudden change moment corresponding to the power distribution fault of the priority level, the method further includes: If there is at least one mutation moment corresponding to a low priority power distribution fault within a preset period after the mutation moment corresponding to a high priority power distribution fault, the mutation moment corresponding to the high priority power distribution fault is used as the target mutation moment.

5. The method for handling faults of distribution automation equipment according to claim 2, characterized in that: The power distribution fault of the power distribution line is judged and processed according to the target mutation moment, including: The power distribution fault corresponding to the target mutation time is recorded as the target power distribution fault, and the analog value of the operating parameter of the target power distribution fault within one power frequency cycle is calculated with the target mutation time as the starting point; Comparing the analog value with the fault protection setting value of the target power distribution fault, and processing the target power distribution fault according to the comparison result; Alternatively, the power distribution fault corresponding to the first target mutation moment is recorded as the first target power distribution fault, and the power distribution fault corresponding to the second target mutation moment is recorded as the second target power distribution fault, and the first target mutation moment is taken as the first starting point to calculate the first analog value of the operating parameter of the first target power distribution fault within a power frequency cycle, and the second target mutation moment is taken as the second starting point to calculate the second analog value of the operating parameter of the second target power distribution fault within a power frequency cycle; Comparing the first analog quantity with the fault protection setting value of the first target power distribution fault, and processing the first target power distribution fault according to the comparison result; The second analog quantity is compared with the fault protection setting of the second target power distribution fault, and the second target power distribution fault is processed according to the comparison result.

6. The method for handling faults of distribution automation equipment according to claim 1, characterized in that: The power distribution fault includes a ground fault and a phase-to-phase short circuit fault; the method includes: Respectively detect whether the phase current, line voltage, zero-sequence voltage and zero-sequence current of the distribution line have sudden changes and the time when they occur; If the zero-sequence voltage and / or the zero-sequence current suddenly changes, the moment when the zero-sequence voltage and / or the zero-sequence current suddenly changes is recorded as the sudden change moment corresponding to the ground fault; If the phase current and / or the line voltage suddenly changes, the moment when the phase current and / or the line voltage suddenly changes is recorded as the sudden change moment corresponding to the phase-to-phase short circuit fault; If the mutation moment corresponding to the interphase short circuit fault is within a preset period after the mutation moment corresponding to the ground fault, the mutation moment corresponding to the interphase short circuit fault is used as the target mutation moment; Whether the interphase short circuit fault occurs in the distribution line is determined according to the target mutation moment, and the interphase short circuit fault occurring in the distribution line is processed according to the determination result.

7. The method for handling faults of distribution automation equipment according to claim 6, characterized in that: Also includes: If there is no sudden change moment corresponding to other priority distribution faults within a preset period after the sudden change moment corresponding to the phase-to-phase short circuit fault, the sudden change moment corresponding to the phase-to-phase short circuit fault is used as the target sudden change moment; Alternatively, if there is no sudden change moment corresponding to other priority level power distribution faults within a preset period after the sudden change moment corresponding to the ground fault, the sudden change moment corresponding to the ground fault is used as the target sudden change moment; Alternatively, if the sudden change moment corresponding to the ground fault is within a preset time period after the sudden change moment corresponding to the inter-phase short-circuit fault, the sudden change moment corresponding to the inter-phase short-circuit fault is used as the target sudden change moment.

8. A distribution automation equipment fault handling device, characterized in that: include: A detection module, used to detect whether and when a sudden change occurs in the operating parameters of each priority level of the distribution line distribution fault; A mutation time recording module, used for recording the time when the operating parameters of each priority level of power distribution fault suddenly change as the mutation time corresponding to the power distribution fault of the priority level; A mutation moment determination module is used to determine a target mutation moment according to the mutation moments corresponding to the power distribution faults of the high priority levels if there is at least one mutation moment corresponding to the power distribution fault of the high priority level within a preset period after the mutation moment corresponding to the power distribution fault of the low priority level; The fault processing module is used to judge and process the power distribution fault of the distribution line according to the target mutation moment.

9. A distribution automation device, characterized in that: The method comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method as claimed in any one of claims 1 to 7 are implemented.

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