Multi-ring net cage bus fault isolation method and system based on digital differential

Abstract

The invention relates to the technical field of power equipment fault detection, and discloses a multi-ring net cage bus fault isolation method and system based on digital differential. The method comprises the following steps: acquiring a three-phase current vector of each outgoing line interval in a ring main unit; constructing a differential current vector sum; judging whether a bus fault exists or not; carrying out current vector mutual transmission among a plurality of ring main units through a GOOSE message communication link; and executing multi-terminal concurrent tripping control to complete fault isolation. In the prior art, a processing mode depending on centralized isolation or local feeder line isolation, and especially in a scene of large bus short-circuit current and lack of communication binding relation, accurate positioning and millisecond-level isolation of a bus fault cannot be realized. Due to the fact that differential criterion calculation and a mutual transmission mechanism based on GOOSE communication are introduced, cross-interval cooperative differential fault judgment and concurrent isolation control are achieved, and the accuracy and response speed of ring main unit bus fault isolation are improved.

Description

Technical Field

[0001] This invention relates to the field of power equipment fault detection technology, and in particular to a method and system for fault isolation of multi-ring network box busbars based on digital differential. Background Technology

[0002] Currently, power distribution systems widely employ ring main units (RMMs) to construct closed-loop networks, enabling multi-directional power supply and flexible transfer capabilities to enhance the power supply reliability and disaster recovery capabilities of the distribution network. In urban distribution networks, rural power grids, and industrial parks, RMMs typically serve as crucial intermediate nodes in 10kV medium-voltage distribution systems. Their typical characteristics include a compact structure, support for multiple circuit connections, and widespread use for switching and isolation control at load boundary points or inter-station connection points. In distribution automation systems, common fault types can be categorized into feeder faults, line faults, and bus faults. Among them, feeder and line faults can be isolated and restored through end protection, automatic reclosing, local feeder automation (FA), etc. However, for bus short circuit faults inside the ring network cabinet, the current technical means generally have problems such as slow response, high misjudgment rate and difficulty in coordinating protection settings. The main problems are as follows: (1) Bus faults are usually accompanied by large current impacts. If the instantaneous overcurrent protection setting is too low, it is easy to cause the incoming switch to malfunction when there is no bus fault, thus expanding the power outage range. If the setting is too high, it will lead to the inability to cut off the actual bus short circuit in time. (2) The bus is located in the internal area between switches. Existing distributed FA or centralized FA cannot determine the location of the internal fault of the bus by comparing the upstream and downstream currents or by feeder remote signaling, resulting in chaotic action sequence or even inability to determine. (3) The centralized fault handling process requires the telemetry data to be sent back to the main station first, then the section is analyzed, and then the trip command is issued. The response process usually takes several seconds, which is difficult to meet the requirements of protection timeliness under strong bus fault conditions. (4) In actual engineering, a ring network box often contains more than 6 bays and needs to be controlled by multiple distribution terminals (DTUs). However, the existing technology cannot realize the aggregation and unified judgment of differential vector information across terminals, resulting in fragmented protection mechanisms and failure to identify faults globally.

[0003] Therefore, there is an urgent need for a multi-ring network box bus fault isolation method based on digital differential, which can still achieve fast and accurate bus fault identification and disconnection control protection in multi-terminal collaborative scenarios, so as to significantly improve fault handling efficiency and system power supply reliability. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, the purpose of this invention is to propose a multi-ring network box bus fault isolation method based on digital differential, aiming to solve the technical problem that existing technologies rely on centralized isolation or local feeder isolation, especially in scenarios with large bus short-circuit currents and missing communication binding relationships, which cannot achieve accurate bus fault location and millisecond-level isolation.

[0005] To solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a multi-ring network box bus fault isolation method based on digital differential. The multi-ring network box bus fault isolation method based on digital differential includes: Step S10: At the sampling time Obtain the current vector set of the ring main unit. ; Step S20: Based on the current vector set Calculate sampling time Total differential current vector sum With differential current magnitude ; Step S30: Based on the differential current magnitude Compared with the preset differential protection action setting Perform local bus fault diagnosis task and output bus fault diagnosis flag. ; Step S40: Obtain the total number of outgoing line intervals When the total number of outgoing line intervals When the number of interfaces supported by a single ring network enclosure exceeds the preset number, a communication link based on GOOSE messages is established between multiple ring network enclosures. Based on the communication link based on GOOSE messages, a system-level bus fault judgment task is performed locally in a single ring network enclosure, and a fault judgment flag bit at the entire ring network enclosure level is output. ; Step S50: Based on the bus fault determination flag bit and full ring network box-level fault judgment flag A mechanism based on differential criterion fusion and multi-terminal collaborative triggering is adopted to execute the concurrent tripping control task of multi-ring network boxes and output the bus fault isolation result.

[0006] Preferably, in step S10, at the sampling time Obtain the current vector set of the ring main unit. The steps specifically include: at the sampling time Collect the outgoing current vectors corresponding to the n outgoing line bays of the ring main unit, and construct a current vector set based on the outgoing current vectors corresponding to the n outgoing line bays. , ,in, The first interval at the sampling time The three-phase current vector, The second interval at the sampling time The three-phase current vector, For the first Each interval at the sampling time The three-phase current vector, For the nth interval at sampling time The three-phase current vectors; where, , This represents the instantaneous current sample value of the i-th interval on phase A; This represents the instantaneous current sample value of the i-th interval on phase B; This represents the instantaneous current sample value of the i-th interval on phase C; This indicates the vector transpose.

[0007] Preferably, in step S20, the total differential current vector sum The formula is expressed as: Differential current magnitude The formula is expressed as: .

[0008] Preferably, in step S30, based on the differential current magnitude... Compared with the preset differential protection action setting Perform local bus fault diagnosis task and output bus fault diagnosis flag. The steps specifically include: Step S301: Based on the differential current magnitude Compared with the preset differential protection action setting Perform differential protection judgment: if If so, it is determined to be a non-busbar fault; if If so, it is determined to be a fault within the busbar section; Step S302: Output the bus fault determination flag based on the differential protection judgment result. .

[0009] Preferably, in step S30, the bus fault determination flag bit The formula is expressed as: .

[0010] Preferably, in step S40, the total number of outgoing line intervals is obtained. When the total number of outgoing line intervals When the number of interfaces supported by a single ring network enclosure exceeds the preset number, a communication link based on GOOSE messages is established between multiple ring network enclosures. Based on the communication link based on GOOSE messages, a system-level bus fault judgment task is performed locally in a single ring network enclosure, and a fault judgment flag bit at the entire ring network enclosure level is output. The steps specifically include: Step S401: Obtain the total number of outgoing line intervals When the total number of outgoing line intervals When the number of interfaces supported by a single ring network enclosure exceeds the preset number, a communication link based on GOOSE messages is established between multiple ring network enclosures. This communication link based on GOOSE messages is used to exchange sampling times between the ring network enclosures. The set of current vectors below; Step S402: For a single ring network box m, ring network box m receives current vector set data from other ring network boxes locally through a communication link based on GOOSE messages, and jointly constructs a full ring network box-level current vector set. Further based on the full-ring network box-level current vector set Calculate sampling time Total differential current vector of the entire ring network box level and the differential current magnitude of the full ring network box level

[0011] Step S403: Based on the differential current magnitude of the full ring network box level Compared with the preset differential action threshold of the entire network Perform system-level bus fault diagnosis task and output full-ring network box-level fault diagnosis flag. .

[0012] Preferably, in step S50, the bus fault determination flag is used. and full ring network box-level fault judgment flag The steps for executing concurrent tripping control tasks for multi-ring network enclosures and outputting bus fault isolation results using a mechanism based on differential criterion fusion and multi-terminal collaborative triggering include: Step S501: When or At that time, a tripping action command is generated. ; Step S502: Construct differential time constraints, which include: the delay between the issuance and execution of the tripping action command is less than or equal to... The time for generating the tripping action command is less than or equal to ; Step S503: Based on differential time constraints and tripping action commands The circuit breakers corresponding to the outgoing line bays in the ring main unit are tripped in a concurrent manner, and the final bus fault isolation result is output. The bus fault isolation result includes the bus fault isolation completion flag, the set of switches actually disconnected, and the control completion timestamp.

[0013] This invention also provides a multi-ring busbar fault isolation system based on digital differential, comprising: The current acquisition module is used to sample the current at the sampling time. Obtain the current vector set of the ring main unit. ; The differential calculation module is used for calculations based on current vector sets. Calculate sampling time Total differential current vector sum With differential current magnitude ; The local fault criterion module is used to determine faults based on the differential current magnitude. Compared with the preset differential protection action setting Perform local bus fault diagnosis task and output bus fault diagnosis flag. ; The communication coordination judgment module is used to obtain the total number of outgoing line intervals. When the total number of outgoing line intervals When the number of interfaces supported by a single ring network enclosure exceeds the preset number, a communication link based on GOOSE messages is established between multiple ring network enclosures. Based on the communication link based on GOOSE messages, a system-level bus fault judgment task is performed locally in a single ring network enclosure, and a fault judgment flag bit at the entire ring network enclosure level is output. ; The trip control module is used to determine bus faults based on the bus fault flag. and full ring network box-level fault judgment flag A mechanism based on differential criterion fusion and multi-terminal collaborative triggering is adopted to execute the concurrent tripping control task of multi-ring network boxes and output the bus fault isolation result.

[0014] The present invention also provides a multi-ring bus fault isolation device based on digital differential, comprising: a memory, a processor, and a multi-ring bus fault isolation program based on digital differential stored in the memory and executable on the processor. When the multi-ring bus fault isolation program based on digital differential is executed by the processor, it implements a multi-ring bus fault isolation method based on digital differential.

[0015] The present invention also provides a computer program product, including a multi-ring bus fault isolation program based on digital differential, wherein the multi-ring bus fault isolation program based on digital differential implements the multi-ring bus fault isolation method based on digital differential when executed by a processor.

[0016] The beneficial effects of this invention are as follows: By introducing differential current vector and calculation logic into the power distribution terminal and combining it with GOOSE message communication to achieve high-speed mutual transmission of current information between multiple terminals, this invention enables the system-level joint judgment of bus faults to be completed even when the number of outgoing line bays exceeds the capacity limit of a single terminal, thereby improving the coverage and accuracy of fault detection.

[0017] Compared to the traditional centralized fault automation system, which requires a second-level delay in issuing commands through background analysis, this invention achieves a control time of less than 100ms for the entire bus fault identification and isolation process by combining local differential protection criteria with fast trip output control. This effectively reduces the energy impact of faults, avoids the risk of multiple feeders tripping falsely and expanding the power outage area, and significantly enhances the power supply continuity and safety of the power distribution system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating the first embodiment of a multi-ring busbar fault isolation method based on digital differential according to the present invention.

[0020] Figure 2 This is a schematic diagram of the multi-ring network box fault isolation operation in the first embodiment of the multi-ring network box bus fault isolation method based on digital differential according to the present invention.

[0021] Figure 3 This is a schematic diagram of a device for a multi-ring busbar fault isolation method based on digital differential according to the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: As Figure 1 The diagram shown is a flowchart of the first embodiment of the multi-ring busbar fault isolation method based on digital differential of the present invention, which presents the first embodiment of the multi-ring busbar fault isolation method based on digital differential of the present invention.

[0024] In the first embodiment, the multi-ring busbar fault isolation method based on digital differential includes: Step S10: At the sampling time Obtain the current vector set of the ring main unit. ; Step S20: Based on the current vector set Calculate sampling time Total differential current vector sum With differential current magnitude ; Step S30: Based on the differential current magnitude Compared with the preset differential protection action setting Perform local bus fault diagnosis task and output bus fault diagnosis flag. ; Step S40: Obtain the total number of outgoing line intervals When the total number of outgoing line intervals When the number of interfaces supported by a single ring network enclosure exceeds the preset number, a communication link based on GOOSE messages is established between multiple ring network enclosures. Based on the communication link based on GOOSE messages, a system-level bus fault judgment task is performed locally in a single ring network enclosure, and a fault judgment flag bit at the entire ring network enclosure level is output. ; Step S50: Based on the bus fault determination flag bit and full ring network box-level fault judgment flag A mechanism based on differential criterion fusion and multi-terminal collaborative triggering is adopted to execute the concurrent tripping control task of multi-ring network boxes and output the bus fault isolation result.

[0025] It should be noted that the current vector set obtained in step S10 is essentially the three-phase instantaneous current data sampled from all outgoing line intervals within the ring network box within the same sampling period. Its structure can be expressed as an ordered vector set, possessing complete time consistency and topological coverage. This set is the basis for subsequent differential criterion calculations, ensuring that the current conservation relationship in the bus region can be accurately reflected in the current vector superposition operation.

[0026] Understandably, during normal operation, the currents in each outgoing line interval satisfy a vector superposition balance relationship, with their vector sum approaching zero. However, once a busbar fault occurs, this balance will be significantly disrupted, and the differential current magnitude will rise rapidly within a very short time. Real-time comparison of this magnitude with the setpoint not only enables sensitive detection of faults within the busbar section but also avoids misjudgments of faults in the terminal branches. By embedding a local differential protection module within the DTU, it eliminates reliance on backend judgment and possesses high-speed protection response capabilities.

[0027] It should be understood that in actual engineering projects, the number of outgoing lines from a ring main unit often exceeds the number of interfaces that a single distribution terminal can support. If multiple DTUs are deployed in a distributed manner, traditional solutions struggle to achieve cross-terminal data fusion and judgment, and protection actions cannot be uniformly coordinated. This invention introduces a communication link based on GOOSE messages, enabling high-speed broadcasting and subscription of current vectors collected by each terminal using the IEC 61850 standard. This breaks down terminal boundary limitations, allowing a single DTU to synthesize system-wide differential current information locally, achieving cross-terminal collaborative judgment and global protection action control. This mechanism achieves closed-loop response for differential protection under distributed deployment without introducing a centralized master station controller.

[0028] For example, such as Figure 2 As shown, the system consists of two typical ring main units: the left ring main unit is controlled by distribution terminal unit DTU1, containing outgoing switches DL101 to DL106; the right ring main unit is controlled by DTU2 and DTU3 respectively, with outgoing bays including DL201 to DL208. The two ring main units are connected by bus interconnection points K1 and K2. During normal system operation, the three-phase currents in each outgoing bay satisfy the current conservation relationship. DTU1~DTU3 share all current vector information through local sampling and GOOSE message transmission mechanism, and the differential current vector sum remains near zero.

[0029] When a bus short-circuit fault occurs at K2, the current balance between DL203 and DL207 is disrupted. The vector sum of the total network currents received by DTU2 and DTU3 will rapidly deviate from the normal value, and the calculated differential current magnitude will exceed the set action threshold. At this time, DTU2 and DTU3 can immediately determine the bus fault at K2 locally and simultaneously disconnect the switches corresponding to DL201 to DL208, isolating the fault area and achieving high-speed closed-loop operation of distributed differential protection. The entire process does not rely on the master station and does not require waiting for station-side voltage loss, completing the protection action within 100ms, effectively preventing fault propagation, reducing the power outage area, and improving the system's local self-healing capability and fault isolation selectivity.

[0030] Example 2: Furthermore, the present invention provides a multi-ring bus fault isolation system based on digital differential, employing a multi-ring bus fault isolation method based on digital differential in the above embodiments, which can solve the technical problem of multi-ring bus fault isolation based on digital differential. Compared with the prior art, the beneficial effects of the multi-ring bus fault isolation system based on digital differential provided by the present invention are the same as the beneficial effects of the multi-ring bus fault isolation method based on digital differential provided in the above embodiments, and other technical features of the multi-ring bus fault isolation system based on digital differential are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0031] Example 3: This invention provides a multi-ring busbar fault isolation device based on digital differential operation. Please refer to... Figure 3 A multi-ring busbar fault isolation device based on digital differential includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enable the at least one processor to perform a multi-ring busbar fault isolation method based on digital differential as described in Embodiment 1 above. The multi-ring busbar fault isolation device based on digital differential in this embodiment of the invention may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), vehicle terminals (e.g., vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. This multi-ring busbar fault isolation device based on digital differential is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of the invention. A multi-ring busbar fault isolation device based on digital differential operation may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory 1002 or a program loaded from a storage device 1003 into a random access memory 1004. The random access memory 1004 also stores various programs and data required for the operation of the multi-ring busbar fault isolation device based on digital differential operation. The processing unit 1001, the read-only memory 1002, and the random access memory 1004 are interconnected via a bus 1005. An I / O interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 allows a digitally differential-based multi-ring busbar fault isolation device to communicate wirelessly or wiredly with other devices to exchange data. While the figure shows a digitally differential-based multi-ring busbar fault isolation device with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0032] Example 4: This invention also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described method for fault isolation of multi-ring busbars based on digital differential operation. The computer program product provided by this invention can solve the technical problem of fault isolation of multi-ring busbars based on digital differential operation. Compared with the prior art, the beneficial effects of the computer program product provided by this invention are the same as those of the fault isolation method for multi-ring busbars based on digital differential operation provided in the above embodiments, and will not be repeated here.

[0033] In particular, according to the embodiments disclosed in this invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from read-only memory 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this invention.

[0034] It should be understood that the various parts disclosed in this invention can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0035] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for fault isolation of multi-ring network box busbars based on digital differential, characterized in that, The methods include: Step S10: At the sampling time Obtain the current vector set of the ring main unit. ; Step S20: Based on the current vector set Calculate sampling time Total differential current vector sum With differential current magnitude ; Step S30: Based on the differential current magnitude Compared with the preset differential protection action setting Perform local bus fault diagnosis task and output bus fault diagnosis flag. ; Step S40: Obtain the total number of outgoing line intervals When the total number of outgoing line intervals When the number of interfaces supported by a single ring network enclosure exceeds the preset number, a communication link based on GOOSE messages is established between multiple ring network enclosures. Based on the communication link based on GOOSE messages, a system-level bus fault judgment task is performed locally in a single ring network enclosure, and a fault judgment flag bit at the entire ring network enclosure level is output. ; Step S50: Based on the bus fault determination flag bit and full ring network box-level fault judgment flag A mechanism based on differential criterion fusion and multi-terminal collaborative triggering is adopted to execute the concurrent tripping control task of multi-ring network boxes and output the bus fault isolation result.

2. The method for fault isolation of multi-ring network box busbars based on digital differential as described in claim 1, characterized in that, In step S10, at the sampling time Obtain the current vector set of the ring main unit. The steps specifically include: at the sampling time Collect the outgoing current vectors corresponding to the n outgoing line bays of the ring main unit, and construct a current vector set based on the outgoing current vectors corresponding to the n outgoing line bays. , ,in, The first interval at the sampling time The three-phase current vector, The second interval at the sampling time The three-phase current vector, For the first Each interval at the sampling time The three-phase current vector, For the nth interval at sampling time The three-phase current vectors; where, , This represents the instantaneous current sample value of the i-th interval on phase A; This represents the instantaneous current sample value of the i-th interval on phase B; This represents the instantaneous current sample value of the i-th interval on phase C; This indicates the vector transpose.

3. The method for fault isolation of multi-ring network box busbars based on digital differential as described in claim 2, characterized in that, In step S20, the total differential current vector sum The formula is expressed as: Differential current magnitude The formula is expressed as: .

4. The method for fault isolation of multi-ring network box busbars based on digital differential as described in claim 1, characterized in that, In step S30, based on the differential current magnitude... Compared with the preset differential protection action setting Perform local bus fault diagnosis task and output bus fault diagnosis flag. The steps specifically include: Step S301: Based on the differential current magnitude Compared with the preset differential protection action setting Perform differential protection judgment: if If so, it is determined to be a non-busbar fault; if If so, it is determined to be a fault within the busbar section; Step S302: Output the bus fault determination flag based on the differential protection judgment result. .

5. The method for fault isolation of multi-ring network box busbars based on digital differential as described in claim 4, characterized in that, In step S30, the bus fault determination flag is set. The formula is expressed as: .

6. The method for fault isolation of multi-ring network box busbars based on digital differential as described in claim 1, characterized in that, In step S40, the total number of outgoing line intervals is obtained. When the total number of outgoing line intervals When the number of interfaces supported by a single ring network enclosure exceeds the preset number, a communication link based on GOOSE messages is established between multiple ring network enclosures. Based on the communication link based on GOOSE messages, a system-level bus fault judgment task is performed locally in a single ring network enclosure, and a fault judgment flag bit at the entire ring network enclosure level is output. The steps specifically include: Step S401: Obtain the total number of outgoing line intervals When the total number of outgoing line intervals When the number of interfaces supported by a single ring network enclosure exceeds the preset number, a communication link based on GOOSE messages is established between multiple ring network enclosures. This communication link based on GOOSE messages is used to exchange sampling times between the ring network enclosures. The set of current vectors below; Step S402: For a single ring network box m, ring network box m receives current vector set data from other ring network boxes locally through a communication link based on GOOSE messages, and jointly constructs a full ring network box-level current vector set. Further based on the full-ring network box-level current vector set Calculate sampling time Total differential current vector of the entire ring network box level and the differential current magnitude of the full ring network box level Step S403: Based on the differential current magnitude of the full ring network box level Compared with the preset differential action threshold of the entire network Perform system-level bus fault diagnosis task and output full-ring network box-level fault diagnosis flag. .

7. The method for fault isolation of multi-ring network box busbars based on digital differential as described in claim 1, characterized in that, In step S50, based on the bus fault determination flag bit and full ring network box-level fault judgment flag The steps for executing concurrent tripping control tasks for multi-ring network enclosures and outputting bus fault isolation results using a mechanism based on differential criterion fusion and multi-terminal collaborative triggering include: Step S501: When or At that time, a tripping action command is generated. ; Step S502: Construct differential time constraints, which include: the delay between the issuance and execution of the tripping action command is less than or equal to... The time for generating the tripping action command is less than or equal to ; Step S503: Based on differential time constraints and tripping action commands The circuit breakers corresponding to the outgoing line bays in the ring main unit are tripped in a concurrent manner, and the final bus fault isolation result is output. The bus fault isolation result includes the bus fault isolation completion flag, the set of switches actually disconnected, and the control completion timestamp.

8. A multi-ring busbar fault isolation system based on digital differential, applied to the multi-ring busbar fault isolation method based on digital differential as described in any one of claims 1 to 7, characterized in that, The multi-ring network bus fault isolation system based on digital differential includes: The current acquisition module is used to sample the current at the sampling time. Obtain the current vector set of the ring main unit. ; The differential calculation module is used for calculations based on current vector sets. Calculate sampling time Total differential current vector sum With differential current magnitude ; The local fault criterion module is used to determine faults based on the differential current magnitude. Compared with the preset differential protection action setting Perform local bus fault diagnosis task and output bus fault diagnosis flag. ; The communication coordination judgment module is used to obtain the total number of outgoing line intervals. When the total number of outgoing line intervals When the number of interfaces supported by a single ring network enclosure exceeds the preset number, a communication link based on GOOSE messages is established between multiple ring network enclosures. Based on the communication link based on GOOSE messages, a system-level bus fault judgment task is performed locally in a single ring network enclosure, and a fault judgment flag bit at the entire ring network enclosure level is output. ; The trip control module is used to determine bus faults based on the bus fault flag. and full ring network box-level fault judgment flag A mechanism based on differential criterion fusion and multi-terminal collaborative triggering is adopted to execute the concurrent tripping control task of multi-ring network boxes and output the bus fault isolation result.

9. A multi-ring network box bus fault isolation device based on digital differential, characterized in that, The digital differential multi-ring bus fault isolation device includes: a memory, a processor, and a digital differential multi-ring bus fault isolation program stored in the memory and executable on the processor. When the digital differential multi-ring bus fault isolation program is executed by the processor, it implements a digital differential multi-ring bus fault isolation method according to any one of claims 1 to 7.

10. A computer program product, characterized in that, The computer program product includes a digital differential multi-ring bus fault isolation program, which, when executed by a processor, implements a digital differential multi-ring bus fault isolation method according to any one of claims 1 to 7.

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