Capacitor redundancy type control method of ultra-high-speed circuit breaker
By using the basic capacitor and redundant capacitor in the circuit breaker in parallel and turning the redundant capacitor in the circuit breaker when the circuit breaker has not been opened, the problem of difficult opening of the capacitor in the circuit breaker is solved, and the stability and safety of the circuit breaker are improved.
Patent Information
- Application Number
- CN202411950298.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-05-13
AI Technical Summary
Capacitor failure in the circuit breaker makes it difficult to open the circuit breaker, reducing the stability of the circuit breaker opening and increasing the possibility of electrical equipment failure and damage.
The basic capacitor and redundant capacitor are set in parallel. By obtaining the circuit breaker's opening command and opening duration, the opening result information is analyzed. If the circuit breaker has not completed opening, the switching of the basic capacitor will be cancelled and the switching command of the redundant capacitor will be generated to ensure that the circuit breaker can be opened in time.
By switching off the redundant capacitors, the circuit breaker can be opened in time, which improves the stability of the circuit breaker opening and reduces the possibility of electrical equipment failure and damage.
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Figure CN119994784A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of circuit breakers, and in particular to a capacitor redundancy control method for ultra-high-speed circuit breakers. Background Art
[0002] Ultra-high-speed circuit breakers are important power equipment that can quickly trip when responding to short circuits or overloads during normal operation. With the rapid development of smart grids and new energy access, ultra-high-speed circuit breakers will continue to apply new technologies to meet market demand and present development trends such as intelligence, digitization, and green environmental protection.
[0003] The main components of a circuit breaker include contacts, vacuum interrupter, wiring terminals, capacitors, equipment housing, etc. Among them, capacitors play a vital role in circuit breakers, and their functions are mainly reflected in the following aspects: filtering function, reducing the interference of high-frequency noise and clutter on the circuit breaker; energy storage function, providing additional power support for the opening of the circuit breaker and improving the reaction speed of the circuit breaker; protection function, absorbing part of the overvoltage and part of the overcurrent, etc.
[0004] The process of the capacitor in the circuit breaker performing the energy storage function is roughly as follows: the capacitor is pre-charged to store some electrical energy. When the circuit breaker needs to be opened, the capacitor works together with the configured power supply of the circuit breaker, or works independently to drive the circuit breaker to open, thereby achieving the purpose of quickly and reliably cutting off the circuit.
[0005] For circuit breaker equipment that independently provides the electrical energy required for closing and opening the circuit breaker through a capacitor, after a failure of the capacitor (the failure here refers to a failure that can cause the failure of capacitor switching), the circuit breaker will be difficult to open, and it will also be difficult to cut off the line where the circuit breaker is located, which reduces the stability of the circuit breaker opening and increases the possibility of failure or even damage to the electrical equipment on the line. Summary of the invention
[0006] In order to improve the stability of circuit breaker opening, the present application provides a capacitor redundancy control method for an ultra-high-speed circuit breaker.
[0007] The present application provides a capacitor redundant control method for an ultra-high-speed circuit breaker, which adopts the following technical solution:
[0008] A capacitor redundancy control method for an ultra-high-speed circuit breaker, the method being applied to a circuit breaker device having a basic capacitor and a redundant capacitor, the basic capacitor and the redundant capacitor being arranged in parallel with each other, and both being used to provide a power source for opening the circuit breaker, the method comprising:
[0009] Obtain the opening command of the circuit breaker and the opening time required for the circuit breaker to open;
[0010] Obtaining an opening instruction of the circuit breaker and obtaining opening result information of whether the circuit breaker is opened after the opening time has elapsed;
[0011] Based on the opening result information, analyzing whether the circuit breaker opening is completed;
[0012] If the circuit breaker opening is not completed, the switching of the basic capacitor is canceled and a switching instruction of the redundant capacitor is generated.
[0013] The basic capacitor, as the main power source or auxiliary power source for the circuit breaker to open, is used to store electrical energy and provide operating energy to the circuit breaker when needed, thereby directly or indirectly driving the circuit breaker to open; and the redundant capacitor, as an alternative device for the basic capacitor, can quickly provide operating energy to the circuit breaker when the basic capacitor cannot be switched on or fails to switch on, filling the energy gap that the basic capacitor fails to take effect in time, thereby ensuring that the circuit breaker can be opened in time.
[0014] The execution subject of the method may be a system for controlling the switching of basic capacitors and redundant capacitors.
[0015] Through the above technical solution, after the opening instruction of the circuit breaker is generated, the circuit breaker will open after a preset time (some circuit breakers are opened immediately, and some circuit breakers are opened with a delay). The system obtains the opening instruction of the circuit breaker and the required opening time of the circuit breaker, and after the required opening time of the circuit breaker, it continues to obtain the opening result information of the circuit breaker to determine whether the circuit breaker has completed the opening. If the circuit breaker has not completed the opening, the basic capacitor switching is canceled and the redundant capacitor switching instruction is generated, thereby completing the switching of the redundant capacitor and providing power for the opening of the circuit breaker.
[0016] Through this method, when the circuit breaker cannot be opened due to a basic capacitor failure, the redundant capacitor is immediately switched on to provide the electric energy required for the circuit breaker to open, thereby ensuring that the circuit breaker can be opened in time, thereby improving the stability of the circuit breaker opening and reducing the possibility of damage to the electrical equipment of the line where the circuit breaker is located.
[0017] In a preferred example, the present application may be further configured as follows: after switching on the redundant capacitor, the following processing steps are further included:
[0018] Obtain the circuit breaker opening review information;
[0019] Analyzing whether the circuit breaker is opened based on the opening verification information of the circuit breaker;
[0020] If the circuit breaker is opened, the redundant capacitor is adjusted to the priority switching capacitor, the basic capacitor is adjusted to the secondary switching capacitor, and maintenance alarm information of the basic capacitor is generated.
[0021] Through the above technical solution, after generating the switching instruction of the redundant capacitor and switching the redundant capacitor, the system obtains the circuit breaker opening verification information (that is, the verification information including whether the circuit breaker opening is completed), and can know whether the circuit breaker has completed the opening. If the circuit breaker opening is completed, it means that the redundant capacitor can operate normally and can successfully drive the circuit breaker to open.
[0022] At this time, when the basic capacitor switching fails and the redundant capacitor switching takes effect, the switching priority of the basic capacitor and the redundant capacitor is adjusted, that is, the redundant capacitor is set as the priority switching capacitor, and the basic capacitor is set as the secondary switching capacitor (referring to the capacitor with a switching priority lower than the redundant capacitor), so that at least one normally operating capacitor can provide power for the next opening of the circuit breaker, thereby improving the success rate of subsequent opening of the circuit breaker.
[0023] In a preferred example, the present application may be further configured as follows: after switching on the redundant capacitor, the following processing steps are further included:
[0024] Obtain the circuit breaker opening review information;
[0025] Analyzing whether the circuit breaker is opened based on the opening verification information of the circuit breaker;
[0026] If the circuit breaker is opened, the fault information of the basic capacitor is obtained;
[0027] Analyzing whether the basic capacitor needs to be repaired based on the fault information of the basic capacitor;
[0028] If the basic capacitor does not need to be repaired, the current number of openings and the upper limit number of openings of the basic capacitor are obtained, and the upper limit number of openings of the redundant capacitor is obtained;
[0029] According to the current number of openings of the basic capacitor and the upper limit number of openings, updating the fault mileage record of the basic capacitor;
[0030] Based on the updated failure mileage record of the basic capacitor, the theoretical number of failures of the redundant capacitor is calculated.
[0031] Through the above technical solution, after knowing that the circuit breaker is successfully opened, it is analyzed whether the fault of the basic capacitor can be self-healed according to the fault information of the basic capacitor (capacitors with self-healing function have been disclosed in the prior art and will not be described in detail here). If it can be self-healed, it means that the basic capacitor does not need to be repaired.
[0032] Then obtain the current opening times of the basic capacitor (i.e., the number of switching times corresponding to the basic capacitor being unable to drive the circuit breaker to open) and the upper limit opening times (i.e., the upper limit of the switching times of the basic capacitor), as well as the upper limit opening times of the redundant capacitor (i.e., the upper limit of the switching times of the redundant capacitor), update the fault mileage record of the basic capacitor, and calculate the theoretical number of faults of the redundant capacitor, so as to simulate the possible switching times of the redundant capacitor according to the usage of the basic capacitor, so as to facilitate the operator to inspect the redundant capacitor in advance to ensure that the circuit breaker can be opened in time to protect the electrical equipment of the line where the circuit breaker is located.
[0033] The reason why the usage of basic capacitors can be used to simulate the number of times redundant capacitors may fail is that the environmental factors such as temperature, humidity and magnetic field distribution at the locations of the two are basically the same. Therefore, the number of failures can be used as a reference to realize the function of capacitor failure prediction.
[0034] In a preferred example, the present application may be further configured as follows: the theoretical number of failures of the redundant capacitor is calculated using the following formula:
[0035]
[0036] Among them, k r is the theoretical number of failures of the redundant capacitor, k j is the current opening times of the basic capacitor, k1 is the upper limit closing times of the basic capacitor, and k2 is the upper limit closing times of the redundant capacitor.
[0037] In a preferred example, the present application may be further configured as follows: after updating the fault mileage record of the basic capacitor according to the current opening times and the upper limit opening times of the basic capacitor, the following processing steps are further included:
[0038] Obtaining multiple actual fault times of the redundant capacitor failing;
[0039] generating a failure mileage record of the redundant capacitor according to a plurality of actual failure times of the redundant capacitor;
[0040] If the last failure recorded in the failure mileage record of the basic capacitor and the last failure recorded in the failure mileage record of the redundant capacitor have different processes, then calculating the expected number of failures of the redundant capacitor;
[0041] Based on the estimated number of failures of the redundant capacitor, failure warning information of the redundant capacitor is generated.
[0042] Through the above technical solution, a fault mileage record of the redundant capacitor is generated according to multiple actual fault times of the redundant capacitor, that is, the number of times the redundant capacitor actually fails (cannot drive the circuit breaker to open) is marked in the switching process of the redundant capacitor.
[0043] If the process of the last failure of the basic capacitor is inconsistent with the process of the last failure of the redundant capacitor, the expected number of failures of the redundant capacitor is calculated, and fault warning information of the redundant capacitor is generated, so that the operator can repair or replace the redundant capacitor in advance.
[0044] In a preferred example, the present application may be further configured as follows: the formula used for calculating the expected number of failures of the redundant capacitor is as follows:
[0045]
[0046] Among them, k x is the expected number of failures of the redundant capacitor, k j is the current opening times of the basic capacitor, a is the last failure times of the basic capacitor, k1 is the upper limit closing times of the basic capacitor, k2 is the upper limit closing times of the redundant capacitor, and b is the last failure times of the redundant capacitor.
[0047] In a preferred example, the present application may be further configured as follows: after calculating the expected number of failures of the redundant capacitor, the following processing steps are further included:
[0048] Calculating the expected number of failure intervals of the redundant capacitor based on the expected number of failures and the last number of failures of the redundant capacitor;
[0049] Obtaining a preset maintenance interval threshold of the redundant capacitor;
[0050] Comparing the estimated number of failure intervals of the redundant capacitor with a maintenance interval threshold of the redundant capacitor;
[0051] If the predicted number of failure intervals is less than or equal to the maintenance interval threshold, the basic capacitor is set as a priority switching capacitor, and the redundant capacitor is set as a secondary switching capacitor.
[0052] Through the above technical solution, the expected number of failure intervals of the redundant capacitor can be calculated using the expected number of failures k of the redundant capacitor. x, minus the last failure number b of the redundant capacitor, to obtain the difference between the expected failure number of the redundant capacitor and the last failure number of the redundant capacitor, that is, the expected failure interval number of the redundant capacitor, and compare the expected failure interval number of the redundant capacitor with the preset maintenance interval threshold of the redundant capacitor (that is, the number of switching intervals between the next maintenance and the last maintenance after the redundant capacitor’s last failure has been repaired).
[0053] If the predicted number of fault intervals is less than or equal to the maintenance interval threshold, the switching priority of the capacitor is maintained, that is, the basic capacitor is set as the priority switching capacitor, and the redundant capacitor is set as the secondary switching capacitor.
[0054] In a preferred example, the present application may be further configured as follows: after calculating the expected number of failure intervals of the redundant capacitor, the following processing steps are further included:
[0055] Calculating an estimated attenuation rate of the redundant capacitor based on an estimated number of failure intervals and a historical number of failure intervals of the redundant capacitor;
[0056] If the predicted attenuation rate is greater than or equal to the preset attenuation limit value of the redundant capacitor, capacitor replacement information is generated.
[0057] Through the above technical solution, based on the expected fault interval number of the redundant capacitor and the historical fault interval number (that is, the number of switching intervals in which the redundant capacitor has actually failed), the expected attenuation rate of the redundant capacitor is calculated, that is, the ratio of the number of two adjacent fault intervals. If it exceeds the preset attenuation limit value of the redundant capacitor at this stage (which can be obtained in the product testing stage), the capacitor replacement information of the redundant capacitor is generated to alert the operator to replace the redundant capacitor in time and fully ensure the stability of the circuit breaker opening.
[0058] In summary, this application includes the following beneficial technical effects:
[0059] 1. When the circuit breaker cannot be opened due to a basic capacitor failure, the redundant capacitor is immediately switched on to provide the power required for the circuit breaker to open, thereby ensuring that the circuit breaker can be opened in time, improving the stability of the circuit breaker opening, and reducing the possibility of damage to the electrical equipment on the line where the circuit breaker is located;
[0060] 2. Based on the analysis of the opening result information and opening review information of the circuit breaker, it is determined whether the circuit breaker has completed the opening, so as to determine whether the redundant capacitor can drive the circuit breaker to complete the opening, and then adjust the switching priority of the redundant capacitor, giving priority to the capacitor in normal operation as the priority switching capacitor to ensure that the circuit breaker can complete the opening in the first time;
[0061] 3. By predicting the number of switching on and off times corresponding to the next situation where the redundant capacitor cannot drive the circuit breaker to open, early warning information is provided to the operator, so that the operator can perform early maintenance on the redundant capacitor to ensure the normal operation of the redundant capacitor, thereby ensuring the stability of the circuit breaker opening. BRIEF DESCRIPTION OF THE DRAWINGS
[0062] Figure 1 It is a flow chart of the capacitor redundancy control method according to an embodiment of the present application.
[0063] Figure 2 It is a flowchart of the maintenance alarm information generation process of the embodiment of the present application.
[0064] Figure 3 It is a flow chart of generating the theoretical number of failures according to an embodiment of the present application.
[0065] Figure 4 It is a flowchart of fault warning information generation in an embodiment of the present application.
[0066] Figure 5 It is a flowchart of determining capacitor switching priority according to an embodiment of the present application.
[0067] Figure 6 It is a schematic diagram of the process of generating capacitor replacement information in an embodiment of the present application.
[0068] Figure 7 It is a schematic diagram of the failure mileage record of the basic capacitor and the redundant capacitor in the embodiment of the present application.
[0069] Description of reference numerals: DETAILED DESCRIPTION
[0070] The following is combined with Figure 1 -Attached Figure 7 This application is described in further detail.
[0071] In an embodiment of the present application, a capacitor redundancy control method for an ultra-high-speed circuit breaker is disclosed. The execution subject of the method may be a system for controlling the switching of basic capacitors and redundant capacitors. The method is applied to circuit breaker equipment having basic capacitors and redundant capacitors.
[0072] The basic capacitor and redundant capacitor are connected in parallel with each other, and the switching of the capacitors is controlled by different switches. They are used to provide power source for the opening of the circuit breaker. For circuit breakers using basic capacitors and redundant capacitors, the capacitor that is switched first at the factory by default is the basic capacitor, which stores electrical energy and provides operating energy to the circuit breaker when needed, thereby directly or indirectly driving the circuit breaker to open.
[0073] Redundant capacitors are backup capacitors for basic capacitors. When basic capacitors cannot be switched on or fail to switch on, they can quickly provide operating energy for the circuit breaker, filling the energy gap that the basic capacitors fail to take effect in time, thereby ensuring that the circuit breaker can be opened in time.
[0074] Refer to the attached Figure 1 As shown, a capacitor redundant control method for an ultra-high-speed circuit breaker includes the following processing steps:
[0075] S101. Obtain an opening instruction of a circuit breaker and an opening time required for opening the circuit breaker.
[0076] In implementation, the closing and opening of the circuit breaker are executed based on instructions. After the opening instruction is issued, the circuit breaker opens after a preset time (i.e., the opening time) (circuit breakers are divided into immediate opening and delayed opening). If the circuit breaker opens immediately after receiving the opening instruction, the opening time is zero.
[0077] S102: After obtaining an opening instruction of the circuit breaker and after the opening time has elapsed, obtaining opening result information of whether the circuit breaker is opened.
[0078] In implementation, after obtaining the opening instruction of the circuit breaker and the opening time has passed, the opening result information of whether the circuit breaker is opened is obtained, and the opening result information includes information on whether the circuit breaker has completed the opening.
[0079] S103: Analyze whether the circuit breaker is opened based on the opening result information.
[0080] In implementation, by analyzing the opening result information, it can be known whether the circuit breaker opening is completed or not.
[0081] S104: If the circuit breaker opening is not completed, cancel the switching of the basic capacitor and generate a switching instruction for the redundant capacitor.
[0082] During implementation, if the circuit breaker opening is completed, it means that the basic capacitor can drive the circuit breaker opening, and there is no need to switch on the redundant capacitor; if the circuit breaker opening is not completed, it means that the basic capacitor drives the circuit breaker to open. At this time, the switching of the basic capacitor is canceled (that is, the control switch of the basic capacitor is disconnected) and the switching instruction of the redundant capacitor is generated, thereby controlling the switching of the redundant capacitor and driving the circuit breaker to open through the redundant capacitor.
[0083] Therefore, when the circuit breaker cannot be driven to open due to a basic capacitor failure, the redundant capacitor is immediately switched on to provide the power required for the circuit breaker to open, ensuring that the circuit breaker can be opened in time, improving the stability of the circuit breaker opening, and reducing the possibility of damage to the electrical equipment on the line where the circuit breaker is located.
[0084] Refer to the attached Figure 2As shown, after the redundant capacitor switching instruction is generated in step S104, the following processing steps are also included:
[0085] S201. Obtain the opening verification information of the circuit breaker.
[0086] In implementation, the opening verification information refers to the verification information on whether the circuit breaker has completed the opening after the redundant capacitor is switched on, that is, the information on whether the circuit breaker has completed the opening under the drive of the redundant capacitor. Based on the analysis of this information, it can be known whether the circuit breaker can be opened based on the drive of the redundant capacitor.
[0087] S202: Analyze whether the circuit breaker is opened based on the circuit breaker opening verification information.
[0088] In implementation, by analyzing the opening review information, it can be known whether the circuit breaker has completed the opening or has not completed the opening.
[0089] S203: If the circuit breaker is opened, the redundant capacitor is adjusted to the priority switching capacitor, the basic capacitor is adjusted to the secondary switching capacitor, and maintenance alarm information of the basic capacitor is generated.
[0090] During implementation, if the circuit breaker can complete the opening based on the switching of redundant capacitors, the switching priority of the capacitors is adjusted, that is, the redundant capacitors are adjusted to the priority switching capacitors, and the basic capacitors are adjusted to the secondary switching capacitors (capacitors with switching priority lower than the redundant capacitors), to ensure that at least one normally operating capacitor can provide power for the next opening of the circuit breaker, thereby improving the success rate of subsequent opening of the circuit breaker.
[0091] Refer to the attached Figure 3 and attached Figure 7 As shown, based on the switching instruction of the redundant capacitor, after the redundant capacitor is switched, the following processing steps may also be included:
[0092] S301. Obtain the opening verification information of the circuit breaker.
[0093] This step is explained in detail with reference to S201.
[0094] S302: Analyze whether the circuit breaker is opened based on the circuit breaker opening verification information.
[0095] This step is explained in detail with reference to S201.
[0096] S303: If the circuit breaker is opened, the fault information of the basic capacitor is obtained.
[0097] In practice, the fault information of the basic capacitor includes information on whether the fault of the basic capacitor failing to drive the circuit breaker to open needs to be repaired. For self-healing capacitors, after a fault occurs, they can continue to be used without detection after self-repair and detection.
[0098] At present, there are capacitor devices with self-healing function, that is, the capacitor can automatically repair damage through internal chemical or physical reactions to restore its original electrical performance. The materials used for self-healing capacitors include metallized polypropylene film, polyester film, etc. When the capacitors made of these materials are subjected to electrical breakdown, a conductive channel will be formed in the damaged area, but at the same time, a self-healing reaction will be triggered. For example, the metal particles in the metallized polypropylene film will be redeposited to fill the damaged area, thereby restoring the insulation performance of the capacitor.
[0099] S304: Analyze whether the basic capacitor needs to be repaired based on the fault information of the basic capacitor.
[0100] In implementation, after analyzing the basic capacitor fault information, it is concluded that the basic capacitor needs to be repaired or does not need to be repaired.
[0101] S305: If the basic capacitor does not need to be repaired, obtain the current number of disconnections and the upper limit number of disconnections of the basic capacitor, and obtain the upper limit number of disconnections of the redundant capacitor.
[0102] In implementation, if the basic capacitor does not need maintenance, the current number of openings obtained refers to the number of switching times corresponding to the basic capacitor's inability to drive the circuit breaker to open; the upper limit of the basic capacitor's opening times obtained refers to the upper limit of the switching that the basic capacitor can drive the circuit breaker to open (it can also be understood as the maximum switching value). After the switching value is reached again, the performance of the capacitor will be significantly reduced; the upper limit of the redundant capacitor's opening times obtained refers to the upper limit of the switching that the redundant capacitor can drive the circuit breaker to open.
[0103] S306: Update the fault mileage record of the basic capacitor according to the current number of openings of the basic capacitor and the upper limit number of openings.
[0104] In implementation, updating the fault mileage record of the basic capacitor means marking the location of the switching times of the fault that cannot drive the circuit breaker to open during the switching process of the basic capacitor, which can reflect the proportion of the multiple fault switching times relative to the online opening times.
[0105] S307 . Calculate the theoretical number of times the redundant capacitor fails based on the updated failure mileage record of the basic capacitor.
[0106] In practice, the specific calculation of the theoretical number of failures of redundant capacitors is based on the following formula:
[0107]
[0108] Among them, k r is the theoretical number of failures of redundant capacitors, k j is the current opening times of the basic capacitor, k1 is the upper limit closing times of the basic capacitor, and k2 is the upper limit closing times of the redundant capacitor.
[0109] Calculate the theoretical number of failures of redundant capacitors, i.e. k r , the corresponding switching times when the redundant capacitor fails. The derivation principle of this formula is that according to the current number of disconnections when the basic capacitor fails, relative to the upper limit of the basic capacitor closing times, the theoretical number of corresponding faults that the redundant capacitor will theoretically encounter, relative to the upper limit of the redundant capacitor closing times, is inferred, as shown in the following formula:
[0110]
[0111] Based on the above formula, k1, k2, k j are all known quantities, k r is the only unknown quantity, so the theoretical number of failures k for redundant capacitor failures is r Solve it and you can calculate the theoretical number of failures k r The specific value of k is calculated r Afterwards, the operator does not simply perform troubleshooting for the number of times, but can perform advance maintenance within a certain interval near the number of times to prevent problems before they occur.
[0112] Refer to the attached Figure 4 and attached Figure 7 As shown, after the fault mileage record of the basic capacitor is updated in step S306, the following processing steps are also included:
[0113] S401. Obtain multiple actual fault times of redundant capacitor failures.
[0114] In implementation, the multiple actual fault times of the redundant capacitor referred to here refer to the number of times that the redundant capacitor has actually been switched on and off and cannot drive the circuit breaker to open.
[0115] S402: Generate a failure mileage record of the redundant capacitor according to multiple actual failure times of the redundant capacitor.
[0116] In practice, the failure mileage record of the redundant capacitor and the failure mileage record of the basic capacitor have the same meaning and will not be described in detail.
[0117] S403: If the last failure recorded in the failure mileage record of the basic capacitor and the last failure recorded in the failure mileage record of the redundant capacitor have different processes, then calculate the expected number of failures of the redundant capacitor.
[0118] In practice, the process referred to here is inconsistent. Figure 7 , give an example. For example, in the fault mileage record of the basic capacitor, when the ath switching occurs, the circuit breaker cannot be driven to open. Here, the ath switching is the number of switchings that the basic capacitor failed to drive the circuit breaker to open. For ease of understanding, it is assumed that the value of a is exactly half of k1. In the fault mileage record of the redundant capacitor, the number of switchings that failed to drive the circuit breaker to open is b, and b is not equal to half of k2, or is not within the range of half of k2, it is considered "process inconsistency", and the expected number of failures of the redundant capacitor is calculated at this time.
[0119] S404: Generate fault warning information of the redundant capacitor based on the estimated number of failures of the redundant capacitor.
[0120] During implementation, fault warning information of redundant capacitors is generated so that operators can inspect or replace redundant capacitors in advance.
[0121] Refer to the attached Figure 4 and attached Figure 7 As shown, the expected number of failures of redundant capacitors is calculated using the following formula:
[0122]
[0123] Among them, k x is the expected number of failures of redundant capacitors, k j k is the current opening times of the basic capacitor, a is the last fault times of the basic capacitor, k1 is the upper limit closing times of the basic capacitor, k2 is the upper limit closing times of the redundant capacitor, and b is the last fault times of the redundant capacitor. x and k r No size distinction.
[0124] Calculate the expected number of failures of redundant capacitors, k x After correction, the expected number of failures of redundant capacitors is calculated. The derivation principle of this formula is that for the basic capacitor, the difference between the number of switching times that cannot drive the circuit breaker to close (i.e., k j -a), the proportion of the upper limit of the basic capacitor closing times, and the proportion is analogized to the upper limit of the redundant capacitor closing times, and the difference between the number of switching times when the redundant capacitor fails to drive the circuit breaker to close is calculated in turn (i.e., k x -a), then we can get the following equation:
[0125]
[0126] Based on the above formula, k1, k2, k j , a, b are all known quantities, k x is the only unknown quantity, so the expected number of failures k for redundant capacitors is x By solving, we can calculate the expected number of failures k of the redundant capacitor x The specific value of .
[0127] In addition, the reason why we need to use analogy to estimate the expected number of failures k of redundant capacitors is x The solution is required because there are certain differences between the specifications and models of the basic capacitors and the specifications and models of the redundant capacitors, and the corresponding upper limit closing times are also different.
[0128] Refer to the attached Figure 5 As shown, after calculating the expected number of failures of the redundant capacitor in step S403, the following processing steps are also included:
[0129] S501 . Calculate the expected number of failure intervals of the redundant capacitor based on the expected number of failures and the last number of failures of the redundant capacitor.
[0130] In the implementation, the expected number of failures k is calculated. x , minus the last failure number b of the redundant capacitor, the expected failure interval number of the redundant capacitor can be obtained.
[0131] S502: Obtain a preset maintenance interval threshold of a redundant capacitor.
[0132] In implementation, the preset maintenance interval threshold of the redundant capacitor is the number of switching intervals between the next regular maintenance and the last maintenance according to convention after the redundant capacitor has been repaired after its last failure.
[0133] S503: Compare the predicted number of failure intervals of the redundant capacitor with the maintenance interval threshold of the redundant capacitor.
[0134] S504: If the predicted number of fault intervals is less than or equal to the maintenance interval threshold, the basic capacitor is set as the priority switching capacitor, and the redundant capacitor is set as the secondary switching capacitor.
[0135] In implementation, if the expected failure intervals of the redundant capacitor are less than or equal to the maintenance intervals, it means that there is a possibility of failure of the redundant capacitor before the next routine maintenance of the redundant capacitor. In this case, the basic capacitor is set as the priority switching capacitor and the redundant capacitor is set as the secondary switching capacitor to ensure the stability of the circuit breaker opening.
[0136] Refer to the attached Figure 6As shown, after calculating the expected number of failure intervals of the redundant capacitor in step S501, the following processing steps are also included:
[0137] S601: Calculate an estimated attenuation rate of the redundant capacitor based on an estimated number of failure intervals and a historical number of failure intervals of the redundant capacitor.
[0138] In practice, the calculation process of the historical fault interval times can refer to the calculation of the expected fault interval times, that is, the interval switching times of the adjacent faults that have actually occurred. The expected attenuation rate of the redundant capacitor is the ratio of the interval times of two adjacent faults.
[0139] S602: If the estimated attenuation rate is greater than or equal to the preset attenuation limit value of the redundant capacitor, capacitor replacement information is generated.
[0140] In implementation, if the expected attenuation rate of the redundant capacitor is greater than or equal to the preset attenuation limit value of the redundant capacitor at this stage (which can be obtained during the product testing phase), capacitor replacement information for the redundant capacitor is generated to alert the operator to replace the redundant capacitor in time and fully ensure the stability of the circuit breaker opening.
[0141] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application in turn. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A capacitor redundant control method for an ultra-high-speed circuit breaker, characterized in that: The method is applied to a circuit breaker device having a basic capacitor and a redundant capacitor, wherein the basic capacitor and the redundant capacitor are arranged in parallel with each other and are both used to provide a power source for opening the circuit breaker. The method comprises: Obtain the opening command of the circuit breaker and the opening time required for the circuit breaker to open; Obtaining an opening instruction of the circuit breaker and obtaining opening result information of whether the circuit breaker is opened after the opening time has elapsed; Based on the opening result information, analyzing whether the circuit breaker opening is completed; If the circuit breaker opening is not completed, the switching of the basic capacitor is canceled and a switching instruction of the redundant capacitor is generated.
2. The capacitor redundant control method for an ultra-high-speed circuit breaker according to claim 1, characterized in that: After switching on the redundant capacitor, the following processing steps are also included: Obtain the circuit breaker opening review information; Analyzing whether the circuit breaker is opened based on the opening verification information of the circuit breaker; If the circuit breaker is opened, the redundant capacitor is adjusted to the priority switching capacitor, the basic capacitor is adjusted to the secondary switching capacitor, and maintenance alarm information of the basic capacitor is generated.
3. The capacitor redundant control method for an ultra-high-speed circuit breaker according to claim 1, characterized in that: After switching on the redundant capacitor, the following processing steps are also included: Obtain the circuit breaker opening review information; Analyzing whether the circuit breaker is opened based on the opening verification information of the circuit breaker; If the circuit breaker is opened, the fault information of the basic capacitor is obtained; Analyzing whether the basic capacitor needs to be repaired based on the fault information of the basic capacitor; If the basic capacitor does not need to be repaired, the current number of openings and the upper limit number of openings of the basic capacitor are obtained, and the upper limit number of openings of the redundant capacitor is obtained; According to the current number of openings of the basic capacitor and the upper limit number of openings, updating the fault mileage record of the basic capacitor; Based on the updated failure mileage record of the basic capacitor, the theoretical number of failures of the redundant capacitor is calculated.
4. The capacitor redundant control method for an ultra-high-speed circuit breaker according to claim 3, characterized in that: The formula used to calculate the theoretical number of failures of the redundant capacitor is as follows: Among them, k r is the theoretical number of failures of the redundant capacitor, k j is the current opening times of the basic capacitor, k1 is the upper limit closing times of the basic capacitor, and k2 is the upper limit closing times of the redundant capacitor.
5. The capacitor redundancy control method for an ultra-high-speed circuit breaker according to claim 3, characterized in that: After updating the fault mileage record of the basic capacitor according to the current opening times and the upper limit opening times of the basic capacitor, the following processing steps are also included: Obtaining multiple actual fault times of the redundant capacitor failing; generating a failure mileage record of the redundant capacitor according to a plurality of actual failure times of the redundant capacitor; If the last failure recorded in the failure mileage record of the basic capacitor and the last failure recorded in the failure mileage record of the redundant capacitor have different processes, then calculating the expected number of failures of the redundant capacitor; Based on the estimated number of failures of the redundant capacitor, failure warning information of the redundant capacitor is generated.
6. The capacitor redundancy control method for an ultra-high-speed circuit breaker according to claim 5, characterized in that: The formula used to calculate the expected number of failures of the redundant capacitor is as follows: Among them, k x is the expected number of failures of the redundant capacitor, k j is the current opening times of the basic capacitor, a is the last failure times of the basic capacitor, k1 is the upper limit closing times of the basic capacitor, k2 is the upper limit closing times of the redundant capacitor, and b is the last failure times of the redundant capacitor.
7. The capacitor redundancy control method for an ultra-high-speed circuit breaker according to claim 5, characterized in that: After calculating the expected number of failures of the redundant capacitor, the following processing steps are also included: Calculating the expected number of failure intervals of the redundant capacitor based on the expected number of failures and the last number of failures of the redundant capacitor; Obtaining a preset maintenance interval threshold of the redundant capacitor; Comparing the estimated number of failure intervals of the redundant capacitor with a maintenance interval threshold of the redundant capacitor; If the predicted number of failure intervals is less than or equal to the maintenance interval threshold, the basic capacitor is set as a priority switching capacitor, and the redundant capacitor is set as a secondary switching capacitor.
8. The capacitor redundancy control method for an ultra-high-speed circuit breaker according to claim 7, characterized in that: After calculating the expected number of failure intervals of the redundant capacitor, the following processing steps are also included: Calculating an estimated attenuation rate of the redundant capacitor based on an estimated number of failure intervals and a historical number of failure intervals of the redundant capacitor; If the predicted attenuation rate is greater than or equal to the preset attenuation limit value of the redundant capacitor, capacitor replacement information is generated.