Rapid breaking device based on ultra-high-speed circuit breaker and energy dissipation self-checking method
By employing parallel switches and energy dissipation mechanisms in the switching device, and utilizing capacitor arc extinguishing and self-testing to switch redundant zinc oxide resistors, the problem of insufficient energy dissipation caused by zinc oxide resistor failure was solved, thereby improving safety and equipment reliability.
Patent Information
- Application Number
- CN202511327167.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-17
- Publication Date
- 2025-11-14
AI Technical Summary
Failure of some zinc oxide resistors in existing switching devices can reduce energy dissipation and increase the likelihood of safety accidents and equipment damage.
The system employs parallel switches and energy dissipation mechanisms, including normal energy dissipation components and redundant energy dissipation components. It uses capacitors to switch reverse current to extinguish arcs and performs self-checks and switches redundant zinc oxide resistors in case of faults to ensure the normal operation of the energy dissipation mechanism.
After a short-circuit fault, the system performs a self-check and switches on redundant zinc oxide resistors to fully utilize their energy dissipation function, reduce the possibility of safety accidents and equipment damage, balance the service life of zinc oxide resistors, and reduce maintenance frequency and costs.
Smart Images
Figure CN120954939A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of circuit breaking device technology, and in particular to a fast breaking device based on an ultra-high speed circuit breaker and an energy dissipation self-testing method. Background Technology
[0002] Circuit breaking devices are a common type of circuit protection equipment in power systems. They are typically used to close, carry, and interrupt current in power systems. They can quickly cut off fault current under abnormal conditions such as short circuits and overloads to prevent equipment damage and electrical fires.
[0003] The circuit breaking device works in conjunction with the arc extinguishing device through moving and stationary contacts to achieve safe circuit switching. It is widely used in power transmission, distribution, and industrial control scenarios, and is a core device to ensure the stable operation of the power grid. It also has both manual and automated operation functions.
[0004] Circuit breakers are typically equipped with energy dissipation mechanisms to absorb abnormal electrical energy when the line is overloaded or short-circuited, thereby reducing the possibility of safety accidents and equipment damage. Zinc oxide resistors are a common type of energy dissipation mechanism in circuit breakers. When a large current passes through, they can convert electrical energy into heat energy for dissipation. Zinc oxide resistors exhibit a high resistance state at low voltage and a low resistance state at high voltage.
[0005] Typically, the energy dissipation mechanism within a switching device includes several zinc oxide resistors connected in parallel, which work together to dissipate energy when a large current passes through. However, if some of these zinc oxide resistors fail, the energy dissipation effect of the switching device will be reduced, thus increasing the possibility of safety accidents and equipment damage. Summary of the Invention
[0006] To reduce the possibility of safety accidents and equipment damage, this application provides a fast interruption device based on an ultra-high speed circuit breaker and an energy dissipation self-test method.
[0007] Firstly, this application provides a fast interruption device based on an ultra-high-speed circuit breaker, which adopts the following technical solution: A fast interruption device based on an ultra-high speed circuit breaker includes a switch one, a switch two and an energy dissipation mechanism connected in parallel, wherein a capacitor is provided in the branch where the switch two is located. The energy dissipation mechanism includes a normal energy dissipation component and a redundant energy dissipation component. The normal energy dissipation component includes several zinc oxide resistors (I), and the redundant energy dissipation component includes several zinc oxide resistors (II). The zinc oxide resistors (I) and (II) are all connected in parallel. The zinc oxide resistors (II) can be independently disconnected and switched on / off.
[0008] With the above technical solution, during the normal operation of this fast-breaking device, switch one is in the closed state and switch two is in the open state. The branch where switch one is located carries the working current, while in the branch where the energy dissipation mechanism is located, since the voltage across the energy dissipation mechanism (i.e., zinc oxide resistor) is low, no current flows through the branch where the energy dissipation mechanism is located.
[0009] When a short-circuit fault occurs, the system controlling this fast-breaking device, after acquiring the short-circuit current signal, immediately controls switch one to open within a very short time based on the fast-opening characteristics of the ultra-high-speed circuit breaker. Although switch one can execute the opening command, there may still be an unextinguished arc between the moving and stationary contacts of switch one. At this time, switch two is controlled to close, so that the branch where the capacitor is located is conducting. The reverse current formed by the capacitor switching in the branch where switch one is located is superimposed, which extinguishes the arc between the moving and stationary contacts of switch one, thus completing the arc extinguishing.
[0010] After the arc is extinguished, the voltage across the capacitor increases. Since the capacitor and the energy dissipation mechanism are connected in parallel, the voltage across the energy dissipation mechanism also increases synchronously. When the voltage across the energy dissipation mechanism reaches the conduction voltage of the energy dissipation mechanism, the fault current is mainly dissipated by the energy dissipation mechanism. That is, the zinc oxide resistor in the energy dissipation mechanism converts the electrical energy of the fault current into heat energy, thereby achieving the purpose of energy dissipation.
[0011] If the system detects that the current in the branch where the energy dissipation mechanism is located exceeds the conduction current threshold (that is, the maximum current that the energy dissipation branch can have under the premise that all zinc oxide resistors of the normal energy dissipation components are working normally), it indicates that there is a faulty zinc oxide resistor in the normal energy dissipation components. At this time, the system analyzes the number of faulty zinc oxide resistors and then switches on the corresponding number of zinc oxide resistors in the redundant energy dissipation components, thereby enabling the energy dissipation mechanism to operate normally and ensuring that the energy dissipation mechanism can fully perform its energy dissipation function.
[0012] This technical solution can self-check whether there is a faulty zinc oxide resistor 1 in the device after a short circuit fault occurs, thereby analyzing and switching on the corresponding number of spare zinc oxide resistors 2, thus giving full play to the energy dissipation function of the energy dissipation mechanism and reducing the possibility of safety accidents and equipment damage.
[0013] Secondly, based on the aforementioned fast-breaking device based on an ultra-high-speed circuit breaker, this application also provides an energy dissipation self-testing method based on an ultra-high-speed circuit breaker, employing the following technical solution: A self-test method for energy dissipation based on an ultra-high-speed circuit breaker, the method comprising: Obtain the short-circuit current signal; Control the switch to open; Control the closing of the two switches; The real-time voltage value of the energy dissipation mechanism is obtained. If the real-time voltage value reaches the conduction voltage value of the energy dissipation mechanism, the switch is controlled to open in two stages.
[0014] Through the above technical solution, the system controlling this fast-breaking device immediately controls switch one to open after obtaining the short-circuit current signal. Although switch one can execute the opening command, there may still be an unextinguished arc between the moving contact and the stationary contact of switch one. At this time, switch two is then controlled to close, so that the branch where the capacitor is located is connected. The reverse current formed by the capacitor switching is superimposed on the branch where switch one is located, so that the arc between the moving contact and the stationary contact of switch one is extinguished, thus completing the arc extinguishing.
[0015] After the arc is extinguished, the voltage across the capacitor increases, and the real-time voltage across the energy dissipation mechanism also increases synchronously. When the real-time voltage across the energy dissipation mechanism reaches its conduction voltage, the fault current is primarily dissipated by the energy dissipation mechanism. Specifically, the zinc oxide resistor (one) in the energy dissipation mechanism, a standby component, converts the electrical energy of the fault current into heat energy, thus achieving the purpose of energy dissipation. Then, switch two is controlled to open.
[0016] In a preferred embodiment, this application can be further configured such that, after the control switch is tripped, it includes: After the real-time voltage value reaches the conduction voltage value of the energy dissipation mechanism, the peak current of the branch where the energy dissipation mechanism is located is obtained; If the peak current exceeds the conduction current threshold of the energy dissipation structure, the number of faulty zinc oxide resistors in the normal energy dissipation component is determined based on the peak current. Based on the number of faulty zinc oxide resistors (first type) in the normal energy dissipation component, determine the number of zinc oxide resistors (second type) to be switched. Based on the number of zinc oxide resistors 2 being switched, several switching instructions for zinc oxide resistors 2 corresponding to the number of switching instructions are generated.
[0017] With the above technical solution, after the real-time voltage values on both sides of the energy dissipation mechanism reach the conduction voltage value of the energy dissipation mechanism, the short-circuit current is introduced into the branch where the energy dissipation mechanism is located, and the electrical energy of the short-circuit current is converted into heat energy by multiple zinc oxide resistors.
[0018] After obtaining the peak current of the branch where the energy dissipation mechanism is located (i.e., the maximum current of the branch where the energy dissipation mechanism is located during this short-circuit fault), if the peak current exceeds the conduction current value, it indicates that the energy dissipation function of the energy dissipation mechanism is not fully utilized and there is a faulty zinc oxide resistor one. At this time, based on information such as the peak current, the maximum short-circuit current, the line voltage level, and the resistance value of the energy dissipation mechanism, the number of faulty zinc oxide resistor one is calculated and analyzed, and then the corresponding number of switching commands for zinc oxide resistor two are generated so as to fully utilize the energy dissipation function of the energy dissipation mechanism.
[0019] In a preferred embodiment, this application can be further configured such that generating a plurality of switching instructions for zinc oxide resistors of a number corresponding to the number of switching operations based on the number of switching operations for the second zinc oxide resistor includes: Obtain the cumulative number of cuts and the number of consecutive cuts for each of the zinc oxide resistors. Based on the cumulative number of switching and the consecutive number of switching for each zinc oxide resistor, a priority switching table for zinc oxide resistor is generated. Based on the priority switching table and the switching quantity, a number of switching instructions for zinc oxide resistors corresponding to the switching quantity are generated.
[0020] The above technical solution obtains the cumulative number of switching operations and the number of consecutive switching operations for each zinc oxide resistor, so as to understand the current service life and continuous usage of each zinc oxide resistor. Based on the above status of each zinc oxide resistor, a priority switching table for zinc oxide resistors is generated to prioritize switching zinc oxide resistors with fewer usage operations and fewer consecutive switching operations, thereby maintaining a balance in the service life of multiple zinc oxide resistors and reducing the maintenance frequency and cost of redundant energy dissipation components in the energy dissipation mechanism.
[0021] In a preferred embodiment, this application can be further configured such that generating a priority switching table for each zinc oxide resistor based on the cumulative number of switching operations and the consecutive number of switching operations includes: Based on the cumulative number of cuts for each zinc oxide resistor, sort them from smallest to largest to generate a cut count sequence table; In the sequence of switching counts, match the zinc oxide resistor 2 that has reached the continuous switching threshold; Zinc oxide resistors that have reached the continuous switching threshold are removed from the switching sequence list to generate the priority switching list.
[0022] The above technical solution first sorts each zinc oxide resistor 2 from smallest to largest based on the cumulative number of switching operations, generating a switching operation sequence table; then, in the switching operation sequence table, matches zinc oxide resistor 2 that have reached the continuous switching threshold, and removes them from the switching operation sequence table to generate a priority switching table, so as to prioritize the switching of zinc oxide resistor 2 with fewer usage times and fewer consecutive switching operations.
[0023] In a preferred embodiment, this application can be further configured such that generating a plurality of switching instructions for zinc oxide resistors corresponding to the number of switching operations based on the priority switching table and the switching quantity includes: Obtain the number of zinc oxide resistors 2 corresponding to different levels of the priority switching table, wherein the cumulative number of switching times of zinc oxide resistors 2 at the same level in the priority switching table is the same; Based on the number and cutting quantity of zinc oxide resistors corresponding to different levels, the zinc oxide resistors with the maximum cumulative cutting number required are determined. The priority cutting level in the priority cutting table is called the target level. The zinc oxide resistors to be switched in the target layer are sorted according to the switching interval duration, and the second one is called the target resistor. Based on the target resistor and all zinc oxide resistors of all levels before the target level, a number of switching instructions for zinc oxide resistors of the specified number are generated.
[0024] Using the above technical solution, in the priority cutting table, the first level has the fewest cumulative cutting times for zinc oxide resistor II, while the last level has the most cumulative cutting times, and so on, with zinc oxide resistor II in the same level having the same number of cumulative cutting times. After obtaining the quantity of zinc oxide resistor II in all different levels of the priority cutting table, the priority cutting level of the zinc oxide resistor II with the maximum required cumulative cutting times can be determined based on the cutting quantity.
[0025] For example, if the cutting quantity is 5, the first level corresponds to 3 zinc oxide resistors and the second level corresponds to 4 zinc oxide resistors. If the 3 zinc oxide resistors in the first level do not meet the cutting quantity requirement, then the required zinc oxide resistors will be matched from the next level, that is, 2 zinc oxide resistors will be matched from the second level (5-3=2). The second level is called the target level.
[0026] To further clarify the zinc oxide resistor II to be switched in the target level, let's continue with the example above. Since all zinc oxide resistor II in the second level have the same cumulative switching count, it is necessary to clarify the target to be switched in the second level.
[0027] Based on the interval between the first two switching operations of multiple zinc oxide resistors in the second level, they are sorted, that is, the zinc oxide resistor with the longer switching interval is selected first as the zinc oxide resistor to be switched in the second level, which is the target resistor.
[0028] At this point, all the switching targets have been identified according to the priority switching table. In other words, the identified switching targets are the target resistor in the target level and the zinc oxide resistors corresponding to all levels before the target level. At this time, the switching instructions for the above resistors can be generated.
[0029] In a preferred embodiment, this application can be further configured such that the level of the zinc oxide resistor II, which determines the maximum cumulative number of cuts required based on the number and cutting quantity of zinc oxide resistor II corresponding to different levels, in the priority cutting table is determined according to the following formula: , It is the number of zinc oxide resistors in the first layer. This represents the number of zinc oxide resistors in the nth layer, where n is the maximum value. n is the number of cuts, and n+1 is the level of the zinc oxide resistor II in the priority cutting table, which represents the maximum cumulative number of cuts required.
[0030] Using the above technical solution as an example, if the number of cuts is 6, and the number of zinc oxide resistors corresponding to the first and second layers is 1 and 2 respectively, then the maximum value of n is 2. Therefore, the target resistor needs to be determined in the (n+1)th layer, which means the target resistor needs to be determined in the third layer.
[0031] In summary, this application includes the following beneficial technical effects: 1. After a short circuit fault occurs, this device can self-check whether there is a faulty zinc oxide resistor 1 in the device, thereby analyzing and switching on the corresponding number of spare zinc oxide resistors 2, so as to give full play to the energy dissipation function of the energy dissipation mechanism and reduce the possibility of safety accidents and equipment damage. 2. This method can prioritize switching on zinc oxide resistors that have been used less frequently and have been switched on and off less often, thereby maintaining a balanced lifespan for multiple zinc oxide resistors and reducing the maintenance frequency and cost of redundant energy dissipation components in the energy dissipation mechanism. Attached Figure Description
[0032] Figure 1 This is a structural schematic diagram of the fast-break device in the embodiments of this application, mainly illustrating the structure of the fast-break device.
[0033] Figure 2 This is a flowchart illustrating the energy dissipation self-test method in the embodiments of this application.
[0034] Figure 3 This is a flowchart illustrating the process of generating switching instructions in an embodiment of this application.
[0035] Figure 4 This is a flowchart illustrating the process of generating switching instructions in an embodiment of this application.
[0036] Figure 5 This is a schematic diagram of the process for generating the priority switching table in the embodiments of this application.
[0037] Figure 6This is a flowchart illustrating the process of confirming the target level and target resistance in an embodiment of this application.
[0038] Explanation of reference numerals in the attached figures: 1. Switch one; 2. Switch two; 3. Energy dissipation mechanism; 4. Capacitor. Detailed Implementation
[0039] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail.
[0040] This application discloses a fast interruption device and energy dissipation self-test method based on an ultra-high speed circuit breaker. The subject of this method can be the system that controls the fast interruption device.
[0041] See attached document Figure 1 As shown, attached Figure 1 Other unrelated component symbols have been omitted. A fast breaking device based on an ultra-high speed circuit breaker includes a switch 1, a switch 2 and an energy dissipation mechanism 3 connected in parallel. The branches of the above three are equipped with current transformers to sense the current changes in the branches. The branch of switch 2 is equipped with a capacitor 4.
[0042] See attached document Figure 1 As shown, the energy dissipation mechanism 3 includes a normal energy dissipation component and a redundant energy dissipation component. The normal energy dissipation component includes several zinc oxide resistors (I), and the redundant energy dissipation component includes several zinc oxide resistors (II). The zinc oxide resistors (I) and (II) are all connected in parallel. The zinc oxide resistors (II) can be independently disconnected and switched on / off.
[0043] During normal operation of this device, switch 1 is in the closed state and switch 2 is in the open state. The branch where switch 1 is located carries the working current, while in the branch where energy dissipation mechanism 3 is located, since the voltage across energy dissipation mechanism 3 (i.e., zinc oxide resistor) is low, no current flows through the branch where energy dissipation mechanism 3 is located.
[0044] When a short-circuit fault occurs, the system controlling this fast-breaking device, after acquiring the short-circuit current signal, immediately controls switch 1 to open within a very short time based on the fast-opening characteristics of the ultra-high-speed circuit breaker. Although switch 1 can execute the opening command, there may still be an unextinguished arc between the moving and stationary contacts of switch 1. At this time, switch 2 is controlled to close, so that the branch where capacitor 4 is located is connected. The reverse current formed by the switching of capacitor 4 is superimposed on the branch where switch 1 is located, so that the arc between the moving and stationary contacts of switch 1 is extinguished, thus completing the arc extinguishing.
[0045] After the arc is extinguished, the voltage across capacitor 4 increases. Since capacitor 4 and energy dissipation mechanism 3 are connected in parallel, the voltage across energy dissipation mechanism 3 also increases synchronously. When the voltage across energy dissipation mechanism 3 reaches the conduction voltage of energy dissipation mechanism 3, the fault current is mainly dissipated by energy dissipation mechanism 3. That is, the zinc oxide resistor 1, which is a standby energy dissipation component in energy dissipation mechanism 3, converts the electrical energy of the fault current into heat energy, thereby achieving the purpose of energy dissipation.
[0046] If the system detects that the current in the branch where the energy dissipation mechanism 3 is located exceeds the conduction current threshold (that is, the maximum current that the energy dissipation branch can have under the premise that all zinc oxide resistors of the normal energy dissipation components are working normally), it indicates that there is a faulty zinc oxide resistor in the normal energy dissipation components. At this time, the system analyzes the number of faulty zinc oxide resistors and then switches on the corresponding number of zinc oxide resistors in the redundant energy dissipation components, thereby enabling the energy dissipation mechanism 3 to operate normally and ensuring that the energy dissipation mechanism 3 can fully exert its energy dissipation function.
[0047] This technical solution can self-check whether there is a faulty zinc oxide resistor 1 in the device after a short circuit fault occurs, thereby analyzing and switching on the corresponding number of spare zinc oxide resistors 2, and thus giving full play to the energy dissipation function of the energy dissipation mechanism 3, so as to reduce the possibility of safety accidents and equipment damage.
[0048] See attached document Figure 1 and attached Figure 2 As shown, based on the above-mentioned fast interruption device based on an ultra-high speed circuit breaker, this application also discloses an energy dissipation self-test method based on an ultra-high speed circuit breaker.
[0049] A self-test method for energy dissipation based on ultra-high-speed circuit breakers, comprising the following processing steps: S101, Obtain the short-circuit current signal.
[0050] In practice, the short-circuit current signal, which is the signal reflected in the current value after a short-circuit fault occurs, is used to determine whether a short-circuit fault has occurred. Of course, short-circuit faults can also be determined using other signals, but these will not be elaborated on here. After a short-circuit fault occurs, the short-circuit current will increase rapidly, and the signal of this rapid increase can be captured by the current transformer in the branch where switch-1 is located, thus generating a short-circuit current signal.
[0051] S102, Control switch 1 open.
[0052] During implementation, the control switch 1 is opened to prevent short-circuit current from impacting the downstream electrical equipment of this device.
[0053] S103, control switch 2 is closed.
[0054] During implementation, since there may still be an unextinguished arc between the moving and stationary contacts of switch 1, the control switch 2 is closed, which makes the branch where capacitor 4 is located conduct. The reverse current formed by the switching of capacitor 4 is superimposed on the branch where switch 1 is located, which extinguishes the arc between the moving and stationary contacts of switch 1, thus completing the arc extinguishing.
[0055] S104. Obtain the real-time voltage value of the energy dissipation mechanism 3. If the real-time voltage value reaches the conduction voltage value of the energy dissipation mechanism 3, then control switch 2 to open.
[0056] During implementation, after the arc is extinguished, the voltage across capacitor 4 and the real-time voltage across energy dissipation mechanism 3 increase. When the real-time voltage across energy dissipation mechanism 3 reaches the conduction voltage of energy dissipation mechanism 3, the fault current is mainly dissipated by energy dissipation mechanism 3. That is, the zinc oxide resistor 1, which is a standby energy dissipation component in energy dissipation mechanism 3, converts the electrical energy of the fault current into heat energy, thereby achieving the purpose of energy dissipation and controlling switch 2 to open.
[0057] See attached document Figure 3 As shown, after control switch 2 is opened, the following processing steps may also be included: S201. After the real-time voltage value reaches the conduction voltage value of the energy dissipation mechanism 3, the peak current of the branch where the energy dissipation mechanism 3 is located.
[0058] During implementation, the peak current of the branch where energy dissipation mechanism 3 is located is the maximum current of the branch where energy dissipation mechanism 3 is located during this short circuit fault.
[0059] S202. If the peak current exceeds the conduction current threshold of the energy dissipation structure, the number of faulty zinc oxide resistors in the normal energy dissipation component is determined based on the peak current.
[0060] In implementation, after obtaining the peak current of the branch where the energy dissipation mechanism 3 is located, the peak current is compared with the conduction current threshold. If the peak current exceeds the conduction current value, it indicates that the energy dissipation effect of the energy dissipation mechanism 3 is not fully utilized and there is a faulty zinc oxide resistor 1. At this time, based on information such as the peak current, the maximum short-circuit current, the line voltage level, and the resistance value of the energy dissipation mechanism 3, the number of faulty zinc oxide resistors 1 is calculated and analyzed.
[0061] S203. Based on the number of zinc oxide resistors 1 that have failed in the normal energy dissipation components, determine the number of zinc oxide resistors 2 to be switched.
[0062] In practice, zinc oxide resistor 1 and zinc oxide resistor 2 usually have the same specifications and models. Therefore, if a zinc oxide resistor 1 fails, then a zinc oxide resistor 2 will be switched on.
[0063] S204. Based on the number of zinc oxide resistors 2 being switched, generate several switching instructions for zinc oxide resistors 2 corresponding to the number of switches.
[0064] In practice, once the number of zinc oxide resistors 2 to be switched is determined, a switching command can be generated to control the corresponding zinc oxide resistors 2 to be switched. This can be simply understood as controlling the corresponding switch to close when the zinc oxide resistors 2 are switched.
[0065] See attached document Figure 4 As shown, step S204 may include the following processing steps: S301. Obtain the cumulative number of switching operations and the number of consecutive switching operations for each zinc oxide resistor.
[0066] During implementation, the cumulative number of switching operations and the number of consecutive switching operations for each zinc oxide resistor are obtained to understand the current service life and continuous usage of each zinc oxide resistor.
[0067] Based on the above conditions of each zinc oxide resistor II, a priority switching table for zinc oxide resistor II is generated to prioritize the switching of zinc oxide resistor IIs with fewer usage times and fewer consecutive switching times, thereby maintaining a balance in the service life of multiple zinc oxide resistor IIs and reducing the maintenance frequency and cost of redundant energy dissipation components in energy dissipation mechanism 3.
[0068] S302. Based on the cumulative number of switching operations and the consecutive number of switching operations for each zinc oxide resistor, generate a priority switching table for the zinc oxide resistor.
[0069] This step will be described in detail later.
[0070] S303. Based on the priority switching table and the switching quantity, generate a number of switching instructions for several zinc oxide resistors corresponding to the switching quantity.
[0071] This step will be described in detail later.
[0072] See attached document Figure 5 As shown, step S302 may include the following processing steps: S401. Sort the zinc oxide resistors in ascending order of their cumulative number of cuts to generate a cut count sequence table.
[0073] In implementation, each zinc oxide resistor is sorted from smallest to largest according to the cumulative number of switching operations, generating a switching operation sequence table, and initially establishing the basic framework of the priority switching table.
[0074] S402. In the switching count sequence table, match the zinc oxide resistor 2 that has reached the continuous switching threshold.
[0075] In practice, the continuous switching threshold refers to the maximum value at which the zinc oxide resistor can be continuously switched and operate normally. If the zinc oxide resistor has reached the continuous switching threshold, it must not be switched again in order to ensure that the energy dissipation function is fully utilized.
[0076] S403. Remove the zinc oxide resistor 2 that has reached the continuous switching threshold from the switching number sequence table to generate a priority switching table.
[0077] In practice, zinc oxide resistors that have reached the continuous switching threshold are removed from the switching frequency sequence table to generate a priority switching table, so as to prioritize the switching of zinc oxide resistors that have been used less and have had fewer consecutive switching times.
[0078] See attached document Figure 6 As shown, step S303 may include the following processing steps: S501. Obtain the number of zinc oxide resistors II corresponding to different levels of the priority switching table. The cumulative number of switching times of zinc oxide resistors II at the same level in the priority switching table is the same.
[0079] In practice, according to the priority switching table, the zinc oxide resistor II has the fewest cumulative switching times in the first level, the zinc oxide resistor II has the most cumulative switching times in the last level, and so on. Zinc oxide resistor II units in the same level have the same number of cumulative switching times.
[0080] S502. Based on the number of zinc oxide resistors and the number of cutting operations corresponding to different levels, determine the zinc oxide resistor with the maximum cumulative number of cutting operations required. The priority cutting level in the priority cutting table is called the target level.
[0081] In practice, after obtaining the quantity of zinc oxide resistors of all different levels in the priority cutting table, the priority cutting level in the priority cutting table, which is the target level, can be determined based on the cutting quantity to determine the maximum cumulative cutting number of zinc oxide resistors required.
[0082] For example, if the cutting quantity is 5, the first level corresponds to 3 zinc oxide resistors and the second level corresponds to 4 zinc oxide resistors. If the 3 zinc oxide resistors in the first level do not meet the cutting quantity requirement, then the required zinc oxide resistors will be matched from the next level, that is, 2 zinc oxide resistors will be matched from the second level (5-3=2). The second level is called the target level.
[0083] S503. Sort the zinc oxide resistors to be switched in the target level according to the switching interval duration, and determine the target resistors in the target level.
[0084] In practice, to further clarify the zinc oxide resistors to be switched in the target level, let's continue with the example above. Since all zinc oxide resistors in the second level have the same cumulative switching count, it is necessary to clarify the target to be switched in the second level.
[0085] Based on the interval between the first two switching operations of multiple zinc oxide resistors in the second level, they are sorted, that is, the zinc oxide resistor with the longer switching interval is selected first as the zinc oxide resistor to be switched in the second level, which is the target resistor.
[0086] S504. Based on the target resistor and all zinc oxide resistors in all layers before the target level, generate a number of switching instructions for zinc oxide resistors corresponding to the number of switching operations.
[0087] At this point, all the switching targets have been identified according to the priority switching table. In other words, the identified switching targets are the target resistor in the target level and the zinc oxide resistors corresponding to all levels before the target level. At this time, the switching instructions for the above resistors can be generated.
[0088] Based on the quantity and cutting quantity of zinc oxide resistors II corresponding to different levels, the level of zinc oxide resistors II with the maximum cumulative cutting required is determined according to the following formula in the priority cutting table: , It is the number of zinc oxide resistors in the first layer. This represents the number of zinc oxide resistors in the nth layer, where n is the maximum value. n is the number of cuts, and n+1 is the level of the zinc oxide resistor II in the priority cutting table, which represents the maximum cumulative number of cuts required.
[0089] For example, if the number of cuts is 6, and the number of zinc oxide resistors in the first and second layers is 1 and 2 respectively, then the maximum value of n is 2. Therefore, the target resistor needs to be determined in the (n+1)th layer, which means the target resistor needs to be determined in the third layer.
[0090] The embodiments described in this specific implementation are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A fast interruption device based on an ultra-high-speed circuit breaker, characterized in that: It includes a switch one (1), a switch two (2) connected in parallel and an energy dissipation mechanism (3), wherein a capacitor (4) is provided in the branch where the switch two (2) is located; The energy dissipation mechanism (3) includes a normal energy dissipation component and a redundant energy dissipation component. The normal energy dissipation component includes several zinc oxide resistors I, and the redundant energy dissipation component includes several zinc oxide resistors II. The zinc oxide resistors I and II are all connected in parallel. The zinc oxide resistors II can be independently disconnected and switched.
2. A self-testing method for energy dissipation based on an ultra-high-speed circuit breaker, based on a fast interruption device based on an ultra-high-speed circuit breaker according to claim 1, characterized in that, The method includes: Obtain the short-circuit current signal; Control the opening of switch one (1); Control the closing of the second switch (2); Obtain the real-time voltage value of the energy dissipation mechanism (3). If the real-time voltage value reaches the conduction voltage value of the energy dissipation mechanism (3), control the second switch (2) to open.
3. The energy dissipation self-test method based on an ultra-high-speed circuit breaker according to claim 2, characterized in that, After the control switch two (2) is opened, it includes: After the real-time voltage value reaches the conduction voltage value of the energy dissipation mechanism (3), the peak current of the branch where the energy dissipation mechanism (3) is located is obtained; If the peak current exceeds the conduction current threshold of the energy dissipation structure, the number of faulty zinc oxide resistors in the normal energy dissipation component is determined based on the peak current. Based on the number of faulty zinc oxide resistors (first type) in the normal energy dissipation component, determine the number of zinc oxide resistors (second type) to be switched. Based on the number of zinc oxide resistors 2 being switched, several switching instructions for zinc oxide resistors 2 corresponding to the number of switching instructions are generated.
4. The energy dissipation self-test method based on an ultra-high-speed circuit breaker according to claim 3, characterized in that, The step of generating a plurality of switching instructions for zinc oxide resistors corresponding to the number of switching operations based on the number of switching operations for the second zinc oxide resistor includes: Obtain the cumulative number of cuts and the number of consecutive cuts for each of the zinc oxide resistors. Based on the cumulative number of switching and the consecutive number of switching for each zinc oxide resistor, a priority switching table for zinc oxide resistor is generated. Based on the priority switching table and the switching quantity, a number of switching instructions for zinc oxide resistors corresponding to the switching quantity are generated.
5. The energy dissipation self-test method based on an ultra-high-speed circuit breaker according to claim 4, characterized in that, The generation of a priority switching table for zinc oxide resistors based on the cumulative and consecutive switching counts of each resistor includes: Based on the cumulative number of cuts for each zinc oxide resistor, sort them from smallest to largest to generate a cut count sequence table; In the sequence of switching counts, match the zinc oxide resistor 2 that has reached the continuous switching threshold; Zinc oxide resistors that have reached the continuous switching threshold are removed from the switching sequence list to generate the priority switching list.
6. The energy dissipation self-test method based on an ultra-high-speed circuit breaker according to claim 4, characterized in that, The step of generating a number of switching instructions for zinc oxide resistors II corresponding to the number of switching operations based on the priority switching table and the switching quantity includes: Obtain the number of zinc oxide resistors 2 corresponding to different levels of the priority switching table, wherein the cumulative number of switching times of zinc oxide resistors 2 at the same level in the priority switching table is the same; Based on the number and cutting quantity of zinc oxide resistors corresponding to different levels, the zinc oxide resistors with the maximum cumulative cutting number required are determined. The priority cutting level in the priority cutting table is called the target level. The zinc oxide resistors to be switched in the target layer are sorted according to the switching interval duration, and the second one is called the target resistor. Based on the target resistor and all zinc oxide resistors of all levels before the target level, a number of switching instructions for zinc oxide resistors of the specified number are generated.
7. The energy dissipation self-test method based on an ultra-high-speed circuit breaker according to claim 6, characterized in that, The zinc oxide resistor II, which is determined based on the number and cutting quantity corresponding to different levels, and the level in the priority cutting table, is located according to the following formula: ， It is the number of zinc oxide resistors in the first layer. This represents the number of zinc oxide resistors in the nth layer, where n is the maximum value. n is the number of cuts, and n+1 is the level of the zinc oxide resistor II in the priority cutting table, which represents the maximum cumulative number of cuts required.