Fused accelerated protection in-feeder automation fault handling method and apparatus

Abstract

The application belongs to the technical field of power transmission and distribution, and discloses a kind of fusion acceleration protection's on-site type feeder automation fault handling method and device, wherein the method comprises: when power supply line fails, substation outlet switch protection trips, and the sectionalizing switch of power supply line does not trip;Outlet switch reclosing;If the fault is permanent fault, the sectionalizing switch before fault point trips without delay, and the sectionalizing switch after fault point trips when detecting a short-time incoming power;The sectionalizing switch before fault point recloses in turn with delay, and the sectionalizing switch immediately before fault point trips again and positively locks when reclosing to fault point, to restore power supply of upstream non-fault section;The sectionalizing switch immediately after fault point reversely locks when detecting short-time incoming power again, to complete fault handling.The method of the application solves the problem of existing voltage time type feeder automation, i.e., too many switch actions, long power outage time or too long fault handling time when instantaneous fault occurs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission and distribution, in particular to a kind of fusion acceleration protection on-site type feeder automation fault handling method and device. BACKGROUND

[0002] Distribution network is directly connected with power users, and is the key link to ensure that power is "distributed and used". With the increasing demand for power supply due to rapid economic and social development, distribution network is deeply involved in urban and rural areas, with characteristics such as numerous equipment, complex structure, and variable operating environment, resulting in a high failure rate. Fast, accurate and reliable handling of distribution network faults is of great significance to improve the reliability of power supply and realize reliable operation of distribution network. In order to speed up the handling of distribution network faults, distribution automation systems are widely built and deployed at home and abroad, and feeder automation is used to realize automatic fault handling. According to the implementation mode, feeder automation can be divided into two categories: centralized and on-site. Centralized feeder automation collects fault information of line section switches by distribution automation master station after fault occurs, and judges fault section and remotely controls switch action to isolate. On-site feeder automation automatically isolates faults through line switch cooperation, and does not rely on master station judgment, with the advantages of simple implementation and high reliability.

[0003] There are currently various on-site feeder automation technologies, including on-site reclosing types such as voltage time type, voltage current type, adaptive comprehensive type, and intelligent distributed type that rely on communication. The on-site reclosing type feeder automation does not rely on communication and can realize fault handling through automatic cooperation between switches, and is widely used in distribution networks. Due to the long closing time of some switches in adaptive comprehensive configuration and the complex application configuration of voltage current type, most on-site feeder automation for 10kV distribution lines currently uses voltage time type. Voltage time type section switches use the logic of "loss of voltage tripping and power-on delay closing". When a fault occurs, the line switch protection of the substation is tripped first, all voltage time type switches on the line are tripped due to loss of voltage, the line switch recloses, and the voltage time type switches gradually close after a delay. After closing to the fault section, the substation trips again to isolate the fault section.

[0004] The main problems of voltage time type feeder automation are as follows: (1) After the line switch trips, the section switches do not selectively trip due to loss of voltage, and then gradually reclose, resulting in multiple switch actions and long power outage time for transient faults. (2) The X time limit and Y time limit of section switches are 7s / 5s, and the fault handling time is relatively long. Therefore, it is necessary to propose a new on-site feeder automation fault handling method to solve the above problems and improve the level of distribution network fault handling. SUMMARY

[0005] The embodiment of the present application provides a just-in-place type feeder automation fault processing method and device fused with accelerated protection, so as to solve the problems of too many switch action times, too long power-off time or too long fault processing time of the voltage time type feeder automation in the prior art. In order to have a basic understanding of some aspects of the disclosed embodiments, the following is a simple summary. This part is not a general review, nor is it intended to determine the key / important components or delineate the protection scope of these embodiments. The only purpose is to present some concepts in a simple form as a prelude to the following detailed description.

[0006] According to a first aspect of the embodiment of the present application, a just-in-place type feeder automation fault processing method fused with accelerated protection is provided, comprising:

[0007] When a power supply line fails, the substation outgoing line switch protection trips, and the sectionalizing switch of the power supply line does not trip; after a first time length, the outgoing line switch recloses;

[0008] If the fault is a permanent fault, then:

[0009] The sectionalizing switch before the fault point is not delayed to trip, and the sectionalizing switch after the fault point trips when detecting a short-time incoming power for the first time;

[0010] The sectionalizing switch before the fault point is sequentially delayed to reclose for X time limit, and after reclosing to the fault point, the sectionalizing switch immediately before the fault point trips again and is positively locked out, so as to isolate the front end of the section where the fault point is located and restore power supply of the upstream non-fault section;

[0011] The sectionalizing switch immediately after the fault point is reversely locked out when detecting a short-time incoming power again, so as to isolate the rear end of the section where the fault point is located and complete the fault processing.

[0012] In one embodiment, the step that the sectionalizing switch before the fault point is not delayed to trip and the sectionalizing switch after the fault point trips when detecting a short-time incoming power for the first time in the method further comprises:

[0013] The sectionalizing switch is configured with accelerated protection without delay, so as to realize that the sectionalizing switch before the fault point is not delayed to trip.

[0014] In one embodiment, the accelerated protection in the method comprises phase overcurrent protection, zero sequence overcurrent protection and small current ground transient directional protection.

[0015] In one embodiment, the step that the sectionalizing switch before the fault point is not delayed to trip and the sectionalizing switch after the fault point trips when detecting a short-time incoming power for the first time in the method further comprises:

[0016] The time length of the short-time incoming power is less than X time limit.

[0017] In one embodiment, the step of reclosing the sectionalizing switch before the fault point after the sectionalizing switch before the fault point is sequentially delayed for X time limit closing further comprises:

[0018] The sectionalizing switch is configured with post-closing acceleration protection to achieve reclosing the sectionalizing switch before the fault point again and forward locking.

[0019] In one embodiment, the post-closing acceleration protection in the method comprises phase overcurrent acceleration, zero sequence overcurrent acceleration, and zero sequence voltage acceleration.

[0020] In one embodiment, the step of reclosing the sectionalizing switch before the fault point after the sectionalizing switch before the fault point is sequentially delayed for X time limit closing further comprises:

[0021] The sectionalizing switch before the fault point is accelerated protection after closing to the fault point within a second time length, and the sectionalizing switch before the fault point is closed for a time length less than Y time limit from the last closing to achieve forward locking.

[0022] In one embodiment, the step of reverse locking when the sectionalizing switch after the fault point detects short-time incoming power again further comprises:

[0023] The time length of the short-time incoming power is less than X time limit to achieve reverse locking.

[0024] In one embodiment, the step of reverse locking when the sectionalizing switch after the fault point detects short-time incoming power again further comprises:

[0025] After the tie switch of the power supply line loses voltage on one side, the tie switch is closed after a third time length is reached.

[0026] In one embodiment, the step of reverse locking when the sectionalizing switch after the fault point detects short-time incoming power again further comprises:

[0027] The sectionalizing switch after the section where the fault point is sequentially delayed for X time limit closing to restore power supply to the downstream non-fault section and complete fault handling.

[0028] In one embodiment, the X time limit in the method is 3s.

[0029] In one embodiment, the Y time limit in the method is 2s.

[0030] In one embodiment, the second time length in the method is not greater than 100ms.

[0031] According to a second aspect of an embodiment of the present application, a just-in-place type feeder automation fault handling device integrating acceleration protection is provided.

[0032] In one embodiment, the device comprises an outgoing line switch action module, a sectionalizing switch opening module, a front-end isolation module and a rear-end isolation module; wherein,

[0033] The outgoing line switch action module is configured to cause the substation outgoing line switch to trip when a power supply line fails, and the sectionalizing switch of the power supply line does not trip; after a first time duration, the outgoing line switch is reclosed.

[0034] The sectionalizing switch opening module is configured to cause the sectionalizing switch before the fault point to open without delay when the fault is a permanent fault, and the sectionalizing switch after the fault point to open when a short-time incoming power is detected.

[0035] The front-end isolation module is configured to cause the sectionalizing switch before the fault point to be reclosed in sequence with a delay of X time limit, and after the reclosing to the fault point, the sectionalizing switch before the fault point is opened again and positively locked out, so as to isolate the front end of the section where the fault point is located and restore power supply of the upstream non-fault section.

[0036] The rear-end isolation module is configured to cause the sectionalizing switch next to the fault point to be locked out in reverse when a short-time incoming power is detected again, so as to isolate the rear end of the section where the fault point is located and complete the fault processing.

[0037] According to a third aspect of the embodiments of the present application, a computer device is provided.

[0038] In some embodiments, the computer device comprises a memory and a processor, the memory stores a computer program, and the processor implements the steps of the method according to the first aspect when executing the computer program.

[0039] According to a fourth aspect of the embodiments of the present application, a computer readable storage medium is provided.

[0040] In some embodiments, the computer readable storage medium stores a computer program; and the computer program is executed by a processor to implement the steps of the method according to the first aspect.

[0041] The technical solutions provided by the embodiments of the present application can include the following beneficial effects:

[0042] The application provides a local-type feeder automation fault processing method with fused accelerated protection, wherein a line section switch is applied to a power distribution primary-secondary fused circuit breaker, and a "non-tripping under voltage, accelerated protection tripping under power supply" logic is adopted.

[0043] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0044] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0045] Figure 1 is a flowchart of the fused accelerated protection local-type feeder automation fault processing method provided by the embodiments of the application;

[0046] Figure 2 The embodiments of the application provide a line fault processing schematic Figure 1 ;

[0047] Figure 3 The embodiments of the application provide a line fault processing schematic Figure 2 ;

[0048] Figure 4 The embodiments of the application provide a line fault processing schematic Figure 3 ;

[0049] Figure 4 The embodiments of the application provide a line fault processing schematic Figure 6 ;

[0050] Figure 5 The embodiments of the application provide a line fault processing schematic Figure 7 ;

[0051] Figure 6 The embodiments of the application provide a line fault processing schematic Figure 8 ;

[0052] Figure 7 The embodiments of the application provide a line fault processing schematicFigure 9 ;

[0053] Figure 8 An embodiment of the application provides a line fault processing method Figure 10 ;

[0054] Figure 11 is a structural diagram of a fusion accelerated protection on-site feeder automation fault processing device provided by an embodiment of the application;

[0055] Figure 1 is a structural schematic diagram of a computer device shown according to an exemplary embodiment. DETAILED DESCRIPTION

[0056] The following description and drawings are illustrative of specific embodiments of the present document and are not intended to limit the scope of the present document. Parts and features of some embodiments can be included or substituted in parts and features of other embodiments. The scope of the embodiments of the present document includes the full scope of the claims and all available equivalents of the claims. In this document, the terms "first", "second", and the like are used to distinguish one element from another, but do not require or imply any actual relationship or order between such elements. In fact, the first element can also be referred to as the second element, and vice versa. Moreover, the terms "comprise", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a structure, device or apparatus comprising a list of elements includes not only those elements, but also other elements not explicitly listed, or other elements inherent in such structure, device or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the structure, device or apparatus comprising the element. In this document, various embodiments are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between various embodiments can be referred to each other.

[0057] In this document, the term "a plurality of" means two or more, unless otherwise specified.

[0058] Figure 1 A flowchart of a fusion accelerated protection on-site feeder automation fault processing method of the application is shown, as shown in Figures 2 to 9 .

[0059] S1: When a power supply line fails, the substation outlet switch protection trips, and the sectionalizing switch of the power supply line does not trip; after a first time, the outlet switch recloses.

[0060] In a specific implementation, when a line fails, the substation outlet switch protection first trips, and the line sectionalizing switch does not act.

[0061] In a specific implementation, the substation outgoing switch is reclosed after a certain time length, i.e., the first time length here. If it is a transient fault, the line will resume normal operation. Based on this, for a transient fault, the substation outgoing switch is reclosed once, and the power supply of the entire line can be restored, greatly reducing the power outage time.

[0062] S2: If the fault is a permanent fault, then: the sectional switches before the fault point are opened without delay, and the sectional switches after the fault point are opened when a short-time incoming power is detected.

[0063] In a specific implementation, if it is a permanent fault, all the sectional switches before the fault point are opened without delay. In some embodiments of the present application, when the sectional switches before the fault point are opened without delay, the sectional switches after the fault point are automatically opened when a short-time incoming power is detected.

[0064] In a specific implementation, the sectional switches are configured with non-delayed acceleration protection to realize the non-delayed opening of the sectional switches before the fault point. In other words, when the substation outgoing switch is reclosed, all the sectional switches before the fault point are opened without delay. The implementation method is that the sectional switches are configured with non-delayed acceleration protection, wherein the acceleration protection includes phase overcurrent protection, zero sequence overcurrent protection, and small current ground transient directional protection.

[0065] Further, the time length of the short-time incoming power in this step is less than X time limit. Optionally, the X time limit is 3s.

[0066] S3: The sectional switches before the fault point are sequentially reclosed with a delay of X time limit. After the reclosing to the fault point, the sectional switch immediately before the fault point is opened again and positively locked to isolate the front end of the fault section and restore the power supply of the upstream non-fault section.

[0067] In a specific implementation, after the sectional switches before the fault point are opened without delay, they are sequentially reclosed with a delay. After the sectional switch immediately before the fault point is reclosed to the fault point, it is opened again and positively locked to realize the isolation of the front end of the fault section and the power supply of the upstream non-fault section.

[0068] In a specific implementation, the sectional switches are configured with post-reclosing acceleration protection to realize the opening again and positive locking of the sectional switch immediately before the fault point. In other words, after the sectional switch immediately before the fault point is reclosed to the fault point, it is opened again and positively locked. The implementation method is that the sectional switches are configured with post-reclosing acceleration protection, wherein the post-reclosing acceleration protection includes phase overcurrent acceleration, zero sequence overcurrent acceleration, and zero sequence voltage acceleration.

[0069] In a specific implementation, after closing to the fault point, the sectionalizing switch immediately before the fault point accelerates protection tripping within a time period, i.e., a second time period, and the sectionalizing switch immediately before the fault point is tripped for a time period less than Y time limit from the previous closing, to realize forward locking. Optionally, the Y time limit is 2s, and the second time period is not greater than 100ms.

[0070] S4: When the sectionalizing switch immediately after the fault point detects short-time incoming power again, reverse locking is realized to isolate the rear end of the section where the fault point is located, and the fault processing is completed.

[0071] In a specific implementation, when the sectionalizing switch before the fault point is tripped without delay, the sectionalizing switch after the fault point detects short-time incoming power, and all are automatically tripped; when the sectionalizing switch before the fault point is closed to the fault and tripped again, the sectionalizing switch immediately after the fault point detects short-time incoming power again, and reverse locking is automatically realized to isolate the rear end of the fault section; specifically, the time length of the short-time incoming power is less than X time limit, to realize reverse locking, in other words, the sectionalizing switch after the fault point detects short-time incoming power and is automatically tripped, and the implementation method is that the incoming power time is less than X time limit.

[0072] In a specific implementation, after the tie switch of the power supply line loses voltage on one side, the tie switch is automatically closed after a set delay, i.e., a third time period. The sectionalizing switches after the section where the fault point is located are sequentially closed with X time limit delay, to restore power supply of the downstream non-fault section, and complete the fault processing.

[0073] In summary, the method proposed in the embodiments of the application can realize the following functions:

[0074] Fault detection and accelerated protection after closing to incoming power after voltage loss. This function cooperates with reclosing of the outgoing switch, when the outgoing switch is reclosed, the sectionalizing switch before the fault point detects and accelerates protection tripping to incoming power after closing, to avoid reclosing of the outgoing switch. This function supports phase overcurrent protection, zero sequence overcurrent protection, and small current grounding protection, and protection action has no delay.

[0075] Tripping to short-time incoming power after closing to voltage loss. When the outgoing switch is reclosed to the fault, the sectionalizing switch before the fault point accelerates tripping, and each sectionalizing switch after the fault point detects 1 time of short-time incoming power and is automatically tripped.

[0076] Delayed closing to voltage on one side. When the sectionalizing switch is in a tripped state, the sectionalizing switch detects voltage on one side, and is automatically closed with X time limit (3s) delay.

[0077] Accelerated protection tripping after closing to the fault. When the sectionalizing switch is closed to the fault, the sectionalizing switch detects accelerated protection tripping, to avoid protection tripping of the outgoing switch, supports phase overcurrent protection, zero sequence overcurrent protection, and small current grounding protection, and the delay of the accelerated protection can be set.

[0078] Short-time forward blocking after closing. If the sectional switch is closed with voltage on one side and then opened again within Y time limit (2s) after closing, the forward closing is blocked and the sectional switch with voltage on one side will not be closed again.

[0079] Short-time reverse blocking after opening. If the sectional switch is opened and then senses a short-time incoming voltage on one side within X time limit (3s), the reverse blocking is enabled and the sectional switch will not be closed after incoming voltage on the other side.

[0080] To further illustrate the method proposed in the embodiments of the present application, the present application takes a short-circuit fault as an example to illustrate the action logic. Those skilled in the art can implement the method of the embodiments of the present application according to the following examples and in combination with the foregoing method, for example: processing a single-phase grounding fault.

[0081] Please refer to Figures 3 to 9 , CB1 and CB2 are outgoing switches of line 1 and line 2 respectively, LS1 is a tie switch of the two lines, FB1-FB4 are sectional switches of line 1, the black color of the switch indicates closing, the white color indicates opening, K1-K5 represent line sections, and the dashed line represents the omitted part of line 2.

[0082] In the present example, the outgoing switch CB1 protection configuration is: three-section overcurrent protection, zero sequence overcurrent protection, and small current grounding protection, wherein the overcurrent I section delay is 0.12s, the overcurrent II section delay is 0.4s, the overcurrent III section delay is 0.6s, the zero sequence overcurrent delay is 0.5s, and the small current grounding protection delay is 10s. The configuration is 1-time reclosing, and the reclosing time is 2s.

[0083] Please refer to Figure 3 , a short-circuit fault occurs in K3 section, and the in-situ type feeder automation fault processing process using the fusion accelerated protection of the present application is as follows:

[0084] As shown in Figure 4 , after the fault occurs, the overcurrent protection of the outgoing switch CB1 is opened, and the sectional switches FB1-FB4 remain closed;

[0085] As shown in Figure 5 , after 12s, i.e., after the first time length, reclosing is performed, and if it is a transient fault, reclosing is successful, and the whole line restores normal power supply;

[0086] As shown in Figure 6 , if it is a permanent fault, when CB1 recloses, the sectional switches FB1 and FB2 before the fault point lose voltage and then close to incoming voltage, the fault current is detected, the accelerated protection is opened, and the sectional switches FB3 and FB4 after the fault point detect a short-time incoming voltage and are automatically opened;

[0087] As shown in Figure 7, FB1 unilateral pressure, delay 3s (X time limit) closing, FB2 delay 3s closing, FB2 closing to fault point detection of fault current, accelerate protection tripping (100ms within the second time length), because FB2 closing time is less than 2s (Y time limit) tripping again, locking in the tripping state, realize the front-end isolation of fault section, K1, K2 upstream non-fault section restore power supply;

[0088] As Figure 8 , FB3 unilateral short-time incoming power, incoming power time is less than 3s (X time limit), start reverse locking, the opposite side incoming power will not delay closing, realize the rear-end isolation of fault section;

[0089] As Figure 9 , after the unilateral loss of pressure of the tie switch LS1, the delay closing timing is started, and the automatic closing is performed after the set delay time, i.e., the third time length, to restore the power supply of the K5 section.

[0090] As Figure 10 , FB4 unilateral pressure delay 3s, i.e., X time limit closing, restores the power supply of the K4 section; FB3 has been reverse locked and will not be closed again, and the fault handling process is completed.

[0091] In summary, the fusion of the acceleration protection of the on-site type feeder automation fault handling method proposed in the application adopts the logic of "loss of pressure without tripping, incoming power fault detection and accelerated protection tripping". When handling the short-circuit fault and single-phase grounding fault of the 10kV distribution line, the substation outgoing switch only needs to be reclosed once, which can realize the automatic positioning, isolation of the fault section and the restoration of the power supply of the non-fault section, effectively reduces the reclosing times of the substation outgoing switch, speeds up the fault handling speed and reduces the power outage time of the non-fault section. After the application of the method, the effect is obviously improved compared with the existing voltage time type on-site type feeder automation handling method in terms of the reclosing times of the substation outgoing switch, the action times of the line section switch and the fault handling time.

[0092] It should be understood that although each step in the flowchart is shown in sequence according to the direction of the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise explicitly stated herein, there is no strict order limitation for the execution of these steps, and these steps can be executed in other orders. Moreover, at least part of the steps in the figure can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily sequential, but can be alternately executed with at least part of other steps or sub-steps or stages of other steps.

[0093] Please refer to Figure 11In one embodiment of the present application, a fusion accelerated protection on-site feeder automation fault processing device is provided, comprising an outgoing line switch action module 10, a sectionalizer switch tripping module 20, a front-end isolation module 30 and a rear-end isolation module 40; wherein,

[0094] The outgoing line switch action module 10 is configured to cause the substation outgoing line switch to trip and the sectionalizer switch of the power supply line not to trip when a fault occurs in the power supply line, and cause the outgoing line switch to reclose after a first time duration;

[0095] The sectionalizer switch tripping module 20 is configured to cause the sectionalizer switch before the fault point to trip without delay when the fault is a permanent fault, and cause the sectionalizer switch after the fault point to trip when a short-time incoming power is detected once;

[0096] The front-end isolation module 30 is configured to cause the sectionalizer switch before the fault point to reclose in sequence with a delay of X time limit, and cause the sectionalizer switch immediately before the fault point to trip again and be positively locked out after reclosing to the fault point, so as to isolate the front end of the section where the fault point is located and restore power supply to the upstream non-fault section.

[0097] The rear-end isolation module 40 is configured to cause the sectionalizer switch immediately after the fault point to detect a short-time incoming power again to be reversely locked out, so as to isolate the rear end of the section where the fault point is located and complete the fault processing.

[0098] The specific limitations of the fusion accelerated protection on-site feeder automation fault processing device described above can refer to the limitations of the fusion accelerated protection on-site feeder automation fault processing method described above, which will not be repeated here. Each module in the fusion accelerated protection on-site feeder automation fault processing device described above can be realized by software, hardware and their combination in whole or in part. Each module described above can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to each module.

[0099] In another embodiment of the present application, a computer device is provided, which can be a server, and its internal structure diagram can be as shown in Figure 11 The computer device comprises a processor, a memory and a network interface connected through a system bus. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The database of the computer device is configured to store static information and dynamic information data. The network interface of the computer device is configured to communicate with an external terminal through a network connection. The computer program is executed by the processor to implement the steps in the above method embodiments.

[0100] Those skilled in the art can understand that, ​ The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0101] In an embodiment, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the steps in the above method embodiments.

[0102] A person of ordinary skill in the art can understand that all or part of the processes in the above embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above embodiments. Any reference to memory, storage, database or other medium used in the embodiments of the present application can include at least one of non-volatile and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory. The volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0103] The present application is not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A local feeder automation fault handling method integrating accelerated protection, characterized in that, include: When a power supply line fault occurs, the substation outgoing line switch protection trips, but the sectionalizing switch of the power supply line does not trip. After the first period of time, the outgoing switch is reclosed; If the fault is a permanent fault, then: The sectionalizing switch before the fault point trips without delay, and the sectionalizing switch after the fault point trips when it detects a short-term power supply. The sectionalizing switches before the fault point are closed sequentially with a delay of X time limit. After closing to the fault point, the sectionalizing switch immediately before the fault point accelerates the protection tripping within the second time period. The tripping time of the sectionalizing switch immediately before the fault point from the last closing is less than Y time limit, so as to achieve positive blocking, isolate the front end of the section where the fault point is located, and restore the power supply to the upstream non-faulty section. If the sectionalizing switch immediately following the fault point detects a short-term power supply duration of less than the X time limit, it will implement reverse blocking to isolate the downstream section where the fault point is located and complete the fault handling.

2. The local feeder automation fault handling method with integrated accelerated protection as described in claim 1, characterized in that, The step of the sectionalizing switch before the fault point tripping without delay, and the sectionalizing switch after the fault point tripping upon detecting a short-term power supply, further includes: The sectionalizing switch is equipped with a time-delayed acceleration protection to enable the sectionalizing switch before the fault point to trip without delay.

3. The local feeder automation fault handling method with integrated accelerated protection according to claim 2, characterized in that, The accelerated protection includes phase overcurrent protection, zero-sequence overcurrent protection, and low-current grounding transient directional protection.

4. The local feeder automation fault handling method with integrated accelerated protection as described in claim 3, characterized in that, The step of the sectionalizing switch before the fault point tripping without delay, and the sectionalizing switch after the fault point tripping upon detecting a short-term power supply, further includes: The duration of the short-term incoming call is less than the X time limit.

5. The local feeder automation fault handling method with integrated accelerated protection according to any one of claims 4, characterized in that, The step of sequentially delaying the closing of the sectionalizing switches before the fault point by X time limit, and then opening and positively blocking the sectionalizing switch immediately preceding the fault point after closing to the fault point, further includes: The sectionalizing switch is equipped with a post-closing acceleration protection to enable the sectionalizing switch immediately preceding the fault point to open again and be positively locked.

6. The local feeder automation fault handling method with integrated accelerated protection according to claim 5, characterized in that, The post-closing acceleration protection includes phase overcurrent acceleration, zero-sequence overcurrent acceleration, and zero-sequence voltage acceleration.

7. The local feeder automation fault handling method with integrated accelerated protection according to claim 1, characterized in that, The step of reverse blocking when the sectionalizing switch immediately following the fault point detects a short-term power return further includes: After one side of the power supply line loses voltage, the switch will be closed after a third time period.

8. The local feeder automation fault handling method with integrated accelerated protection according to claim 7, characterized in that, The step of reverse blocking when the sectionalizing switch immediately following the fault point detects a short-term power return further includes: The sectionalizing switches following the fault location are closed sequentially after the X-time delay to restore power supply to the downstream non-faulty sections and complete the fault handling.

9. The local feeder automation fault handling method with integrated accelerated protection according to any one of claims 1-8, characterized in that, The X time limit is 3 seconds.

10. The local feeder automation fault handling method with integrated accelerated protection as described in claim 1, characterized in that, The time limit for Y is 2 seconds.

11. The local feeder automation fault handling method with integrated accelerated protection as described in claim 1, characterized in that, The second duration is no more than 100ms.

12. A local feeder automation fault handling device integrating accelerated protection, characterized in that, It includes an outgoing line switch operating module, a sectionalizing switch tripping module, a front-end isolation module, and a back-end isolation module; among which, The outgoing line switch action module is used to trip the protection of the outgoing line switch of the substation when a fault occurs in the power supply line, and the sectionalizing switch of the power supply line does not trip; after a first period of time, the outgoing line switch is reclosed. The sectionalizing switch tripping module is used to trip the sectionalizing switch before the fault point without delay when the fault is a permanent fault, and to trip the sectionalizing switch after the fault point when a short-term power supply is detected. The front-end isolation module is used to cause the sectionalizing switches before the fault point to close sequentially after a delay of X time limit. After closing to the fault point, the sectionalizing switch immediately before the fault point accelerates the protection tripping within a second time period, and the time between the tripping of the sectionalizing switch immediately before the fault point and the last closing is less than Y time limit, so as to achieve positive blocking, thereby isolating the front end of the section where the fault point is located and restoring power supply to the upstream non-faulty section. The back-end isolation module is used to enable the sectionalizing switch immediately following the fault point to detect a short-term incoming power supply duration of less than X time limit, thereby achieving reverse blocking, isolating the back-end of the section where the fault point is located, and completing the fault handling.

13. A local feeder automation fault handling device with integrated accelerated protection as described in claim 12, characterized in that, The step of the sectionalizing switch before the fault point tripping without delay, and the sectionalizing switch after the fault point tripping upon detecting a short-term power supply, further includes: The sectionalizing switch is equipped with a time-delayed acceleration protection to enable the sectionalizing switch before the fault point to trip without delay.

14. A local feeder automation fault handling device with integrated accelerated protection as described in claim 13, characterized in that, The accelerated protection includes phase overcurrent protection, zero-sequence overcurrent protection, and low-current grounding transient directional protection.

15. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1-11.

16. A computer-readable storage medium, characterized in that, It stores a computer program thereon; the computer program is executed by a processor to implement the method as described in any one of claims 1-11.

Images