Dynamic acceleration over-current protection method, device and equipment for subway buscouple and medium

Abstract

The invention discloses a dynamic acceleration over-current protection method, device and equipment for a subway bus coupler and a medium. Fault current data are obtained by monitoring a power system in real time; comparing the obtained fault current data with a preset dynamic acceleration overcurrent constant value, and when the fault current data exceeds the preset dynamic acceleration constant value, starting dynamic acceleration overcurrent protection action logic; when the overcurrent protection action is dynamically accelerated, receiving and analyzing current starting signals of the I-section bus side and the II-section bus side, and identifying to obtain a fault bus; according to the identified fault bus, selecting corresponding time delay actions, including T1 time delay action, T1 time delay action or T3 time delay action; the protection device can effectively prevent tripping caused by misoperation due to CT disconnection, and avoids an overlarge range of cut-off equipment, thereby improving the reliability of the action of the protection device, and further improving the safety of power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of power system protection, and in particular to a method, device, equipment and medium for dynamic acceleration overcurrent protection of a subway busbar. Background Art

[0002] The working principle of subway power supply relay protection is to determine whether the power supply system is functioning properly by monitoring the state and amount of electrical energy transferred within the power grid. When a system fault occurs, the protection system automatically cuts off the current, protecting the circuit from the fault, and sends a signal to the operator for action. Important protection measures in subway power supply relay protection include overcurrent protection, grounding protection, and overvoltage protection. In existing power systems, overcurrent protection is a crucial measure for ensuring the safe operation of power equipment. Overcurrent protection automatically cuts off the current and issues a fault signal when an overcurrent occurs in the power grid, protecting equipment and personnel.

[0003] However, traditional overcurrent protection systems have shortcomings in response speed and accuracy, especially in dynamic acceleration situations, and are unable to effectively protect power equipment in a timely manner. The existing technology for subway busbar dynamic acceleration overcurrent protection has the following specific problems: Traditional overcurrent protection schemes cannot meet the requirements for protection action selectivity in various fault conditions. In particular, when a CT line is broken in a protection device or communication anomalies occur between adjacent protection devices, the protection device may trip the device that is not at fault. When the communication channel is normal, if a CT disconnect occurs on one device, the device will be unable to send the current start signal to the adjacent protection device in the topology. At this time, a fault occurs at the end of the ring network power supply system, which will cause the dynamic accelerated overcurrent protection T1 time limit of the adjacent bay protection device with the CT disconnect to operate, causing over-tripping and resulting in excessive fault clearance range. In the subway's AC ring network power supply system, if a CT disconnection occurs in a protection device, the CT disconnection signal is transmitted to the adjacent protection device via a communication channel. The overcurrent protection action time limit is dynamically adjusted to prevent over-tripping due to out-of-zone faults. For the protection devices in the AC ring network power supply system, by adding the judgment of the CT disconnection signal, the dynamic accelerated overcurrent protection action time limit of each protection device is made more accurate, thus avoiding the situation where the protection device malfunctions due to the CT disconnection signal, resulting in an excessively large fault clearance range; When the communication channel between the protection device and the opposite protection device is abnormal, and the dynamic acceleration overcurrent protection meets the protection step of the starting condition, the protection control circuit breaker corresponding to the said local protection device trips within the dynamic acceleration overcurrent protection T2 time limit. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that false tripping is easily caused by CT line breakage, and the fault clearance range cannot be accurately controlled. The purpose is to provide a subway busbar dynamic acceleration overcurrent protection method, device, equipment and medium, which can effectively prevent false tripping caused by CT line breakage, accurately identify the fault part, avoid clearing the equipment range too large, thereby improving the reliability of the protection device action and further enhancing the safety of power supply.

[0005] The present invention is achieved through the following technical solutions: A first aspect of the present invention provides a subway busbar dynamic acceleration overcurrent protection method, comprising the following specific steps: Real-time monitoring of power systems to obtain fault current data; Compare the acquired fault current data with the preset dynamic acceleration overcurrent setting value. When the fault current data exceeds the preset dynamic acceleration setting value, the dynamic acceleration overcurrent protection action logic is activated. When the dynamic acceleration overcurrent protection is in operation, the current starting signals of bus section I and bus section II are received and analyzed to identify the faulty bus. According to the identified faulty bus, select the corresponding delayed action, including T1 delayed action, T1 delayed action or T3 delayed action; After any delay action is completed, the tripping logic is triggered to trip the circuit breaker in this bay to isolate the fault.

[0006] Further, the T1 delay action includes: dynamic acceleration overcurrent I bus T1 action logic and dynamic acceleration overcurrent II bus T1 action logic; in, If the GOOSE communication I bus side current start signal is received, the dynamic acceleration overcurrent T1 delay is started. If the GOOSE communication I bus side device fails, the I bus side link is abnormal, or the GOOSE communication link is interrupted or the overcurrent start signal is abnormal, T1 delay is started; When the T1 delay is completed, the dynamic acceleration overcurrent I bus T1 action is triggered; If the GOOSE communication II bus side current start signal is received, the dynamic acceleration overcurrent T1 delay is started; If the GOOSE communication II bus side device fails, the II bus side link is abnormal, or the GOOSE communication link is interrupted or the overcurrent start signal is abnormal, T1 will be delayed; When the T1 delay is completed, the dynamic acceleration overcurrent II bus T1 action is triggered.

[0007] Further, the T2 delay action includes: dynamic acceleration overcurrent I bus T2 action logic and dynamic acceleration overcurrent II bus T2 action logic; in, If the fault condition on the I bus side is met and the dynamic acceleration overcurrent T2 delay is completed, the dynamic acceleration overcurrent I bus T2 action is triggered; If the fault condition on the II bus side is met and the dynamic acceleration overcurrent T2 delay is completed, the dynamic acceleration overcurrent II bus T2 action is triggered.

[0008] Furthermore, the T3 delay action includes a dynamic acceleration overcurrent T3 action; in, When the maximum current exceeds the dynamic acceleration overcurrent setting, the dynamic acceleration overcurrent T3 delay is started; When the T3 delay is completed, the dynamic acceleration overcurrent T3 action is triggered.

[0009] Furthermore, the selection of a corresponding delay action according to the identified faulty bus includes but is not limited to a T1 delay action, a T2 delay action, or a T3 delay action, specifically including: If the current start signal of bus section I exists but not on bus section II, and no fault of bus section I device or link abnormality is detected, then after the T1 delay, the dynamic accelerated overcurrent bus I action is executed, tripping the bus tie breaker of bus section I and tripping all incoming and outgoing line breakers of bus section I in parallel; If the current start signal on the bus section II side exists but the bus section I does not exist, and no device fault or link abnormality is detected on the bus section II side, the dynamic accelerated overcurrent bus II action is executed after the T1 delay, the bus tie circuit breaker on the bus section II side is tripped, and all the incoming and outgoing line circuit breakers on the bus section II side are tripped in parallel.

[0010] Furthermore, the tripping logic includes protection tripping output logic, GOOSE output logic of busbar side output of inter-tripping I and GOOSE output logic of busbar side output of inter-tripping II.

[0011] Furthermore, when the dynamic acceleration overcurrent T3 action occurs, the protection tripping output is triggered; When any of the dynamic acceleration overcurrent T3 action, dynamic acceleration overcurrent I busbar T2 action or dynamic acceleration overcurrent II busbar T2 action occurs, the protection trip output will be triggered to trip the circuit breaker in this bay; When the dynamic acceleration overcurrent I bus T1 action occurs, the GOOSE output of the I bus side is triggered to open; When the dynamic acceleration overcurrent II bus T1 action occurs, the GOOSE output of the II bus side is triggered to open.

[0012] A second aspect of the present invention provides a subway busbar dynamic acceleration overcurrent protection device, comprising: Fault current detection unit, used to monitor the power system in real time to obtain fault current data; A protection starting unit is used to compare the acquired fault current data with a preset dynamic acceleration overcurrent setting value, and when the fault current data exceeds the preset dynamic acceleration setting value, start the dynamic acceleration overcurrent protection action logic; The fault identification unit is used to receive and analyze the current starting signals on the bus section I and bus section II sides when the dynamic acceleration overcurrent protection is activated, and identify the faulty bus; An abnormal condition processing unit is used to select a corresponding delay action according to the identified faulty bus, including but not limited to T1 or T2 delay; Backup protection unit, used for fixed T3 delayed action; The circuit breaker tripping unit triggers the tripping logic after any delayed action is completed to trip the circuit breaker in this bay to isolate the fault.

[0013] A third aspect of the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a method for dynamic accelerated overcurrent protection of a subway busbar is implemented.

[0014] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for dynamic acceleration overcurrent protection of a subway busbar.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: By dynamically accelerating overcurrent protection, the present invention can more accurately control the fault removal range, avoid unnecessary power outages, and solve the problem in the power supply ring network that when removing a fault, the fault removal range may be too large, affecting the normal power supply of non-fault areas. The present invention improves the reliability of the protection device's operation by increasing the judgment of the CT disconnection signal, effectively improving the safety of power supply, and solving the problem that when a CT disconnection occurs in a protection device or communication abnormalities between adjacent protection devices, the existing technology may cause insufficient selectivity of the protection device's operation, thereby affecting the stability of the power supply system. The present invention prevents over-tripping caused by CT disconnection by adjusting the operating time limit of the dynamic accelerated overcurrent protection. The CT disconnection signal is transmitted to the adjacent protection device via a communication channel. The invention also prevents over-tripping caused by out-of-zone faults by adjusting the operating time limit of the dynamic accelerated overcurrent protection. This solves the problem that a CT disconnection in one device may cause over-tripping, that is, the protection device operates on the device that is not at fault, thereby disconnecting the device that is not at fault. The present invention uses a dynamic accelerated overcurrent protection method to quickly and accurately isolate the fault when it occurs, reducing the impact on non-fault areas, thereby improving the reliability and stability of the entire power supply system; The present invention improves the protection performance of the subway power supply system, ensures that the fault can be quickly and effectively isolated when a fault occurs, and guarantees the continuity and safety of subway operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings: Figure 1 This is a dynamic accelerated overcurrent protection process in an embodiment of the present invention; Figure 2 The dynamic acceleration overcurrent protection action logic in the embodiment of the present invention; Figure 3 This is the dynamic acceleration overcurrent protection tripping logic in the embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0018] As a possible implementation, Figure 1 As shown, this embodiment provides a method for dynamic acceleration overcurrent protection of a subway busbar, which specifically includes: real-time monitoring of the power system to obtain fault current data; comparing the obtained fault current data with a preset dynamic acceleration overcurrent setting, and when the fault current data exceeds the preset dynamic acceleration setting, starting the dynamic acceleration overcurrent protection action logic; when the dynamic acceleration overcurrent protection is actuated, receiving and analyzing the current start signals on the busbar section I side and the busbar section II side to identify the faulty busbar; according to the identified faulty busbar, selecting a corresponding delay action, including T1 delay action, T1 delay action or T3 delay action; it can effectively prevent false tripping caused by CT disconnection and avoid cutting off too large a range of equipment, thereby improving the reliability of the protection device action and further improving the safety of power supply.

[0019] After any delay action is completed, the tripping logic is triggered to trip the circuit breaker in this bay to isolate the fault.

[0020] In some possible implementations, the T1 delay action includes: dynamic acceleration overcurrent I bus T1 action logic and dynamic acceleration overcurrent II bus T1 action logic; in, If the GOOSE communication I bus side current start signal is received, the dynamic acceleration overcurrent T1 delay is started. If the GOOSE communication I bus side device fails, the I bus side link is abnormal, or the GOOSE communication link is interrupted or the overcurrent start signal is abnormal, T1 delay is started; When the T1 delay is completed, the dynamic acceleration overcurrent I bus T1 action is triggered; If the GOOSE communication II bus side current start signal is received, the dynamic acceleration overcurrent T1 delay is started; If the GOOSE communication II bus side device fails, the II bus side link is abnormal, or the GOOSE communication link is interrupted or the overcurrent start signal is abnormal, T1 will be delayed; When the T1 delay is completed, the dynamic acceleration overcurrent II bus T1 action is triggered.

[0021] In some possible embodiments, T2 delay action includes: dynamic acceleration overcurrent I bus T2 action logic and dynamic acceleration overcurrent II bus T2 action logic; in, If the fault condition on the I bus side is met and the dynamic acceleration overcurrent T2 delay is completed, the dynamic acceleration overcurrent I bus T2 action is triggered; If the fault condition on the II bus side is met and the dynamic acceleration overcurrent T2 delay is completed, the dynamic acceleration overcurrent II bus T2 action is triggered.

[0022] In some possible implementations, the T3 delay action includes a dynamic acceleration overcurrent T3 action; in, When the maximum current exceeds the dynamic acceleration overcurrent setting, the dynamic acceleration overcurrent T3 delay is started; When the T3 delay is completed, the dynamic acceleration overcurrent T3 action is triggered.

[0023] In some possible implementations, a corresponding delay action is selected based on the identified faulty bus, including but not limited to T1 delay action, T2 delay action, or T3 delay action, specifically including: If the current start signal of bus section I exists but not on bus section II, and no fault of bus section I device or link abnormality is detected, then after the T1 delay, the dynamic accelerated overcurrent bus I action is executed, tripping the bus tie breaker of bus section I and tripping all incoming and outgoing line breakers of bus section I in parallel; If the current start signal on the bus section II side exists but the bus section I does not exist, and no device fault or link abnormality is detected on the bus section II side, the dynamic accelerated overcurrent bus II action is executed after the T1 delay, the bus tie circuit breaker on the bus section II side is tripped, and all the incoming and outgoing line circuit breakers on the bus section II side are tripped in parallel.

[0024] In some possible implementations, the tripping logic includes protection tripping output logic, inter-tripping I bus-side output GOOSE output logic, and inter-tripping II bus-side output GOOSE output logic.

[0025] In some possible implementations, when the dynamic acceleration overcurrent T3 action occurs, the protection tripping output is triggered; When any of the dynamic acceleration overcurrent T3 action, dynamic acceleration overcurrent I busbar T2 action or dynamic acceleration overcurrent II busbar T2 action occurs, the protection trip output will be triggered to trip the circuit breaker in this bay; When the dynamic acceleration overcurrent I bus T1 action occurs, the GOOSE output of the I bus side is triggered to open; When the dynamic acceleration overcurrent II bus T1 action occurs, the GOOSE output of the II bus side is triggered to open.

[0026] In some possible implementations, the dynamic accelerated overcurrent protection of this embodiment, based on the principle of comparing current trigger signals, can provide comprehensive, non-step-dependent, highly selective, and rapid protection for ring cables and busbars in subway ring power systems. This protection automatically identifies ring cable and busbar faults and is unaffected by changes in power supply direction. For large, zoned operations involving multiple substations in a subway power supply system, protection setting values ​​do not require step-by-step coordination; all devices can use a single set of settings.

[0027] Dynamic accelerated overcurrent protection can serve as primary busbar protection or as a fast backup for line fiber differential protection. When the fiber channel is functioning properly and all protective devices are intact, dynamic accelerated overcurrent protection can quickly clear the fault within the T1 time limit. If the fiber channel is damaged or a single device fails, dynamic accelerated protection can still quickly clear the fault within the T2 time limit.

[0028] Dynamic accelerated overcurrent protection has the characteristics of automatically identifying ring network cable faults and busbar faults. It can also isolate faults through device coordination and quickly start the next level of busbar backup to achieve load transfer.

[0029] like Figure 2As shown in the figure, when the device detects a fault current greater than the "dynamic acceleration overcurrent setting," dynamic acceleration overcurrent protection activates. If protection activates without receiving a current pickup signal from busbar I but receiving a current pickup signal from busbar II, a busbar I fault is detected, and dynamic acceleration overcurrent protection activates after a delay of T1. If protection activates without receiving a current pickup signal from busbar II but receiving a current pickup signal from busbar I, a busbar II fault is detected, and dynamic acceleration overcurrent protection also activates after a delay of T1. Dynamic acceleration overcurrent protection T2 delay activates only under abnormal operating conditions, when the device cannot correctly receive current pickup signals from other devices, and simultaneously blocks T1 delay. This abnormal operating condition occurs when the incoming and outgoing line devices of busbars I and II fail to receive their current pickup signals, either due to a fault or a power outage. Dynamic acceleration overcurrent protection T3 delay serves as a backup protection, and operates after a fixed delay. The bus tie circuit breaker is tripped after dynamic acceleration overcurrent protection activates.

[0030] Current Start Signal Description: A current start is identified when any of the device's dynamic acceleration overcurrent protection, dynamic acceleration zero current protection, overcurrent protection, zero-sequence overcurrent protection, overcurrent acceleration protection, or zero-sequence overcurrent acceleration protection is activated. The device receives two types of current start signals: those from the incoming and outgoing lines of busbar section I and those from the incoming and outgoing lines of busbar section II.

[0031] like Figure 3 As shown, the dynamic acceleration overcurrent protection operates at any time limit, tripping the circuit breaker in that bay. The dynamic acceleration overcurrent I bus T1 time limit operates simultaneously, driving the output on the I bus side to trip all incoming and outgoing circuit breakers on the I bus. The dynamic acceleration overcurrent II bus T1 time limit operates simultaneously, driving the output on the II bus side to trip all incoming and outgoing circuit breakers on the II bus.

[0032] As a possible implementation method, this embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the program, a method for dynamic acceleration overcurrent protection of a subway busbar is implemented.

[0033] As a possible implementation method, this embodiment provides a subway busbar dynamic acceleration overcurrent protection device, including: Fault current detection unit, used to monitor the power system in real time to obtain fault current data; A protection starting unit is used to compare the acquired fault current data with a preset dynamic acceleration overcurrent setting value, and when the fault current data exceeds the preset dynamic acceleration setting value, start the dynamic acceleration overcurrent protection action logic; The fault identification unit is used to receive and analyze the current starting signals on the bus section I and bus section II sides when the dynamic acceleration overcurrent protection is activated, and identify the faulty bus; An abnormal condition processing unit is used to select a corresponding delay action according to the identified faulty bus, including but not limited to T1 or T2 delay; Backup protection unit, used for fixed T3 delayed action; The circuit breaker tripping unit triggers the tripping logic after any delayed action is completed to trip the circuit breaker in this bay to isolate the fault.

[0034] As a possible implementation, this embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, a method for dynamic acceleration overcurrent protection of a subway busbar is implemented.

[0035] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A subway busbar dynamic acceleration overcurrent protection method, characterized in that: The specific steps include: Real-time monitoring of power systems to obtain fault current data; Compare the acquired fault current data with the preset dynamic acceleration overcurrent setting value. When the fault current data exceeds the preset dynamic acceleration setting value, the dynamic acceleration overcurrent protection action logic is activated. When the dynamic acceleration overcurrent protection is in operation, the current starting signals of bus section I and bus section II are received and analyzed to identify the faulty bus. According to the identified faulty bus, select the corresponding delayed action, including T1 delayed action, T1 delayed action or T3 delayed action; After any delay action is completed, the tripping logic is triggered to trip the circuit breaker in this bay to isolate the fault.

2. The subway busbar dynamic acceleration overcurrent protection method according to claim 1 is characterized in that: The T1 delay action includes: dynamic acceleration overcurrent I bus T1 action logic and dynamic acceleration overcurrent II bus T1 action logic; in, If the GOOSE communication I bus side current start signal is received, the dynamic acceleration overcurrent T1 delay is started. If the GOOSE communication I bus side device fails, the I bus side link is abnormal, or the GOOSE communication link is interrupted or the overcurrent start signal is abnormal, T1 delay is started; When the T1 delay is completed, the dynamic acceleration overcurrent I bus T1 action is triggered; If the GOOSE communication II bus side current start signal is received, the dynamic acceleration overcurrent T1 delay is started; If the GOOSE communication II bus side device fails, the II bus side link is abnormal, or the GOOSE communication link is interrupted or the overcurrent start signal is abnormal, T1 will be delayed; When the T1 delay is completed, the dynamic acceleration overcurrent II bus T1 action is triggered.

3. The subway busbar dynamic acceleration overcurrent protection method according to claim 2 is characterized in that: The T2 delay action includes: dynamic acceleration overcurrent I bus T2 action logic and dynamic acceleration overcurrent II bus T2 action logic; in, If the fault condition on the I bus side is met and the dynamic acceleration overcurrent T2 delay is completed, the dynamic acceleration overcurrent I bus T2 action is triggered; If the fault condition on the II bus side is met and the dynamic acceleration overcurrent T2 delay is completed, the dynamic acceleration overcurrent II bus T2 action is triggered.

4. The subway busbar dynamic acceleration overcurrent protection method according to claim 3 is characterized in that: The T3 delay action includes a dynamic acceleration overcurrent T3 action; in, When the maximum current exceeds the dynamic acceleration overcurrent setting, the dynamic acceleration overcurrent T3 delay is started; When the T3 delay is completed, the dynamic acceleration overcurrent T3 action is triggered.

5. The subway busbar dynamic acceleration overcurrent protection method according to claim 1 is characterized in that: The selecting of a corresponding delay action according to the identified faulty bus, including but not limited to T1 delay action, T2 delay action or T3 delay action, specifically includes: If the current start signal of bus section I exists but not on bus section II, and no fault of bus section I device or link abnormality is detected, then after the T1 delay, the dynamic accelerated overcurrent bus I action is executed, tripping the bus tie breaker of bus section I and tripping all incoming and outgoing line breakers of bus section I in parallel; If the current start signal on the bus section II side exists but the bus section I does not exist, and no device fault or link abnormality is detected on the bus section II side, the dynamic accelerated overcurrent bus II action is executed after the T1 delay, the bus tie circuit breaker on the bus section II side is tripped, and all the incoming and outgoing line circuit breakers on the bus section II side are tripped in parallel.

6. The subway busbar dynamic acceleration overcurrent protection method according to claim 5 is characterized in that: The tripping logic includes protection tripping output logic, GOOSE output logic of busbar side output of inter-tripping I and GOOSE output logic of busbar side output of inter-tripping II.

7. The subway busbar dynamic acceleration overcurrent protection method according to claim 6 is characterized in that: When the dynamic acceleration overcurrent T3 action occurs, the protection trip output is triggered; When any of the dynamic acceleration overcurrent T3 action, dynamic acceleration overcurrent I busbar T2 action or dynamic acceleration overcurrent II busbar T2 action occurs, the protection trip output will be triggered to trip the circuit breaker in this bay; When the dynamic acceleration overcurrent I bus T1 action occurs, the GOOSE output of the I bus side is triggered to open; When the dynamic acceleration overcurrent II bus T1 action occurs, the GOOSE output of the II bus side is triggered to open.

8. A subway busbar dynamic acceleration overcurrent protection device, characterized in that: include: Fault current detection unit, used to monitor the power system in real time to obtain fault current data; A protection starting unit is used to compare the acquired fault current data with a preset dynamic acceleration overcurrent setting value, and when the fault current data exceeds the preset dynamic acceleration setting value, start the dynamic acceleration overcurrent protection action logic; The fault identification unit is used to receive and analyze the current starting signals on the bus section I and bus section II sides when the dynamic acceleration overcurrent protection is activated, and identify the faulty bus; An abnormal condition processing unit is used to select a corresponding delay action according to the identified faulty bus, including but not limited to T1 or T2 delay; Backup protection unit, used for fixed T3 delayed action; The circuit breaker tripping unit triggers the tripping logic after any delayed action is completed to trip the circuit breaker in this bay to isolate the fault.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the subway busbar dynamic acceleration overcurrent protection method as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the subway busbar dynamic acceleration overcurrent protection method as described in any one of claims 1 to 7 is implemented.

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