Transformer excitation buffering method, system and equipment
By designing a transformer excitation buffer system with multiple buffer branches, and using the control unit to dynamically control the connection of buffer branches, the problem of difficult to meet complex and variable load requirements in the prior art is solved, and the flexibility and stability of the system are improved.
Patent Information
- Application Number
- CN202510049187.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-04-22
AI Technical Summary
The existing transformer excitation buffering method is difficult to meet complex and variable load requirements and is not flexible enough, which may lead to system failure when load changes.
A transformer excitation buffer system is designed, including multiple buffer branches, each buffer branch consisting of a circuit breaker, contactor and buffer resistor. The control unit dynamically controls the connection and disconnection of buffer branches according to load requirements, ensuring that the system can respond flexibly when load changes.
Through the design of multiple buffer branches, the primary load shutdown caused by a single buffer branch is avoided, the system flexibility and stability is improved, complex load needs are met, and the risk of system failure is reduced.
Smart Images
Figure CN119864779A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of energy storage and power supply, and in particular to a transformer excitation buffering method, system and device. Background Art
[0002] In power operations, energy storage emergency power supply technology is an important power supply guarantee technology. In industrial and commercial occasions such as coal mines and oil fields, energy storage emergency power supply can provide power protection services for important loads, ensuring the normal operation of equipment and the safety of operators in emergency situations.
[0003] However, the capacity of the energy storage emergency power supply is limited. It can cope with stable load changes within the capacity range, but when it is subjected to impact loads, it may have insufficient tolerance, which may cause the energy storage emergency power supply system to fail. For example, the excitation inrush current generated when a large-capacity transformer is put into use may cause the energy storage emergency power supply system to fail.
[0004] In response to this situation, the method of setting up a buffer branch is usually adopted, that is, setting a buffer contactor and a buffer resistor between the energy storage emergency power supply and the large-capacity transformer load, so that when the large-capacity transformer is put into use, the buffer contactor and the buffer resistor can absorb and limit the excitation surge current, thereby protecting the energy storage emergency power supply system.
[0005] However, there are still some problems with the design of this buffer branch. For example, when the secondary load needs to be started while the primary load is already running, if the circuit breaker is disconnected again and the buffer contactor and buffer resistor are used again for buffering, the primary load that has been running normally will have to be shut down, which brings great inconvenience and instability. Therefore, this design is difficult to meet complex and changing load requirements and is not flexible enough. Summary of the invention
[0006] The embodiments of the present application provide a transformer excitation buffer method, system and device to solve the problem that the existing transformer excitation buffer method is difficult to meet complex and changeable load requirements and is not flexible enough.
[0007] A transformer excitation buffer system provided in an embodiment of the present application includes a plurality of circuit breakers, a plurality of contactors corresponding to the plurality of circuit breakers, and a buffer resistor; The buffer resistors are respectively connected to the contactors; One end of each circuit breaker is connected to the buffer resistor, and the other end is connected to the corresponding contactor to form a plurality of buffer branches; Each of the buffer branches is connected to each load through a corresponding load transformer.
[0008] In one example, the system further includes a control unit; The control unit receives the switch state feedback signals of each of the circuit breakers and the contactors, and controls the connection or disconnection of each of the buffer branches by controlling the switch states of each of the circuit breakers and the contactors.
[0009] An embodiment of the present application provides a transformer excitation buffer method, which is applied to any of the above transformer excitation buffer systems, and the method includes: Receive switch status feedback signals of each circuit breaker and each contactor; Based on the connectivity requirement of the designated buffer branch, controlling the contactor of the designated buffer branch to close; Controlling the closing time of the circuit breaker of the designated buffer branch according to the capacity of the load transformer corresponding to the designated buffer branch; After determining that the circuit breaker is closed, the contactor is opened to determine that the designated buffer branch is connected.
[0010] In one example, according to the capacity of the load transformer corresponding to the designated buffer branch, the closing time of the circuit breaker of the designated buffer branch is controlled, specifically including: according to a preset load transformer capacity threshold, when it is determined that the capacity of the load transformer corresponding to the designated buffer branch is not greater than the threshold, the closing time of the circuit breaker of the designated buffer branch is controlled to be a first time; when it is determined that the capacity of the load transformer corresponding to the designated buffer branch is greater than the threshold, the closing time of the circuit breaker of the designated buffer branch is controlled to be a second time; the second time is greater than the first time.
[0011] In one example, the second time is positively correlated with the capacity of the load transformer.
[0012] In one example, the method further includes: when there are multiple cache branches that need to be connected, controlling the input time of the multiple buffer branches according to the load connected to each buffer branch.
[0013] In one example, according to the load connected to each buffer branch, the activation time of the multiple buffer branches is controlled, specifically including: determining the activation priorities corresponding to the multiple buffer branches respectively according to preset activation conditions related to the load; and connecting the multiple buffer branches respectively according to the activation priorities.
[0014] In one example, the method further includes: determining a difference between a control signal sent to the circuit breaker or the contactor and a feedback signal received; and judging whether the circuit breaker or the contactor is faulty based on the difference.
[0015] In one example, the method further includes: sending an alarm message when it is determined that the circuit breaker and / or the contactor has a fault.
[0016] An embodiment of the present application provides a transformer excitation buffer device, comprising: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to: Receive switch status feedback signals of each circuit breaker and each contactor; Based on the connectivity requirement of the designated buffer branch, controlling the contactor of the designated buffer branch to close; Controlling the closing time of the circuit breaker of the designated buffer branch according to the capacity of the load transformer corresponding to the designated buffer branch; After determining that the circuit breaker is closed, the contactor is opened to determine that the designated buffer branch is connected.
[0017] The embodiments of the present application provide a transformer excitation buffer method, system and device, which can achieve the following beneficial effects: By setting up multiple buffer branches and connecting multiple loads respectively, the problem in the design of single buffer branches that disconnecting the circuit breaker again will cause the first-level load that has been operating normally to shut down can be solved. The complex needs of the loads can be met and the loads can be connected to the circuit separately according to their different needs. This is convenient and flexible, and improves the system's tolerance, stability and reliability, and avoids the occurrence of system failures.
[0018] Furthermore, using a buffer resistor as a common resistor for a plurality of buffer branches greatly reduces the cost, has a simple circuit structure, is easy to implement, and is beneficial to improving the economy of the system.
[0019] In addition, based on the importance and changes of different loads, the input time of each buffer branch can be flexibly configured to better manage the operation of the system scientifically, solve the problem of unstable power supply caused by different load importance, and improve the adaptability and flexibility of the system.
[0020] By monitoring the working status of each switch, the control unit can promptly and accurately determine whether the switch has a fault or an abnormal problem that cannot be opened or closed normally, and handle it in a timely manner, thereby improving the safety and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. The drawings described here are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A schematic diagram of the structure of a transformer excitation buffer system provided in an embodiment of the present application; Figure 2 A schematic flow chart of a transformer excitation buffering method provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a transformer excitation buffer device provided in an embodiment of the present application. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.
[0023] Figure 1 A schematic diagram of the structure of a transformer excitation buffer system provided in an embodiment of the present application.
[0024] In the entire power supply system, batteries, power conversion systems (PCS), main transformers, excitation buffer units, load transformers, and loads are connected in sequence. The battery provides electrical energy, which is regulated by the transformer and PCS, buffered by the excitation buffer unit, and provided to the load through the load transformer for load operation.
[0025] By setting up an excitation buffer unit as a transitional connection between the load transformer and the battery power supply, when the load is connected to the circuit, the current can be limited, the voltage fluctuation of the power supply can be offset, the stability of the output voltage can be guaranteed, and the energy exchange process can be more stable. It plays a role in protecting the capacitor and balancing the voltage, which is beneficial to improving the reliability and stability of the power supply system.
[0026] In the embodiment of the present application, the excitation buffer unit and the control unit constitute a transformer excitation buffer system.
[0027] Specifically, the excitation buffer unit includes a number of circuit breakers QF1~QFn, a number of contactors KM1~KMn corresponding to the circuit breakers, and a buffer resistor R. The buffer resistor is connected to each contactor respectively, one end of each circuit breaker is connected to the buffer resistor, and the other end is connected to the corresponding contactor to form a number of buffer branches, and each buffer branch is connected to each load through a corresponding load transformer. Among them, there are at least two circuit breakers, and the contactors correspond to the circuit breakers one by one, and there are also at least two. Correspondingly, there are at least two buffer branches composed of circuit breakers, contactors, and buffer resistors, and the buffer resistor is used as a common resistor for multiple buffer branches.
[0028] By setting up multiple buffer branches and connecting different loads respectively, the flexibility of the system is increased, so that the loads can be connected to the circuit according to their different needs, and the diversity of load needs can be met. In this way, when the primary load is started and the secondary load needs to be started, the circuit breaker needs to be disconnected again, and the contactor and buffer resistor need to be used again for buffering, which will force the primary load to shut down, effectively enhancing the stability and reliability of the power supply system.
[0029] In addition, using a buffer resistor as a common resistor for multiple buffer branches has low cost and simple structure, which is beneficial to improving the economy of the power supply system.
[0030] In the transformer excitation buffer system, the control unit receives the switch status feedback signal of each circuit breaker and contactor, and controls the connection or disconnection of each buffer branch by controlling the switch status of each circuit breaker and contactor. In addition, the control unit can also control the closing time of the circuit breaker, control the connection sequence of multiple buffer branches, monitor the working condition of the excitation buffer unit, detect the fault of each component, etc. The transformer excitation buffer method is described in detail below. For matters not described in detail in this embodiment, please refer to the following description.
[0031] Based on the same inventive idea, the embodiment of the present application provides a transformer excitation buffer method corresponding to the above transformer excitation buffer system, such as Figure 2 shown.
[0032] Figure 2 The schematic flow chart of the transformer excitation buffering method provided in the embodiment of the present application includes the following steps: S201: receiving switch status feedback signals of each circuit breaker and each contactor.
[0033] The control unit receives the switch status feedback signals of each circuit breaker and contactor in the excitation buffer unit, determines whether the current switch status of the circuit breaker and contactor is open or closed, and sends a control signal to the corresponding circuit breaker and contactor to change the current switch status of the circuit breaker and contactor from open to closed, or from closed to open, so as to control the connectivity of each buffer branch.
[0034] S202: Based on the connectivity requirement of the designated buffer branch, control the contactor of the designated buffer branch to close.
[0035] When a load needs to be connected to the circuit, the control unit first controls the contactor of the designated buffer branch to close based on the connection requirement of the designated buffer branch corresponding to the load. When the contactor is closed, the load is first connected to the circuit through the buffering of the buffer resistor.
[0036] S203: Controlling the closing time of the circuit breaker of the designated buffer branch according to the capacity of the load transformer corresponding to the designated buffer branch.
[0037] After the contactor is closed, the control unit needs to control the circuit breaker to close as well, so that the load can be directly connected to the circuit through the loop where the circuit breaker is located.
[0038] In the embodiment of the present application, when controlling the circuit breaker to close, the control unit can control the closing time of the circuit breaker of the designated buffer branch according to the capacity of the load transformer corresponding to the designated buffer branch. The closing time refers to the time required for the circuit breaker to change from the open state to the closed state, and is also the time required from the time the circuit breaker receives the closing command (i.e., the closing coil is supplied with voltage) to the moment when all the contacts of the circuit breaker are in contact.
[0039] After the circuit breaker is closed, the connection of the load transformer will generate a large inrush current in the circuit, affecting the stability of the circuit, and the larger the capacity of the load transformer, the larger the inrush current. Therefore, based on the different capacities of the load transformer, the control unit can control the closing time of the circuit breaker when sending a closing command to the circuit breaker.
[0040] Specifically, the control unit can take different control measures for the load transformers on both sides of the boundary based on a preset load transformer capacity threshold, using the threshold as a dividing line. When the capacity of the load transformer corresponding to the designated buffer branch is not greater than the threshold, the load transformer capacity is relatively small, and the excitation surge current generated when connected is also relatively small. The closing time of the circuit breaker of the designated buffer branch can be controlled to be the first time. When the capacity of the load transformer corresponding to the designated buffer branch is greater than the threshold, the load transformer capacity is relatively large, and the excitation surge current generated when connected is also relatively large. A longer closing time is required for sufficient buffering. Therefore, the closing time of the circuit breaker of the designated buffer branch can be controlled to be the second time, and the duration of the second time should be greater than the duration of the first time.
[0041] Furthermore, in order to more effectively alleviate the excitation inrush current generated by the connection of a large-capacity load transformer, the closing time of the corresponding circuit breaker can be further extended as the capacity of the load transformer increases. In other words, the second time is positively correlated with the capacity of the load transformer. Within the controllable range of the closing time of the circuit breaker, the larger the capacity of the corresponding load transformer, the longer the closing time of the circuit breaker when it is closed.
[0042] For example, the preset load transformer capacity threshold is 1MVA. When the load transformer capacity is not greater than 1MVA, the corresponding closing time of the control is 3s. When the load transformer capacity is greater than 1MVA, the corresponding closing time of the control increases by 1s for every increase of 1MVA.
[0043] The closing time is crucial to the stable operation of the power supply system. By controlling the closing time of the circuit breaker according to the capacity of the load transformer, it is helpful to reduce the impact of the excitation surge current when the load transformer is connected to the circuit, and can enhance the safety and stability of the circuit.
[0044] S204: After determining that the circuit breaker is closed, disconnect the contactor and determine that the designated buffer branch is connected.
[0045] After receiving the circuit breaker closing signal, the control unit can send an opening instruction to the contactor to open the contactor, so that the load is directly connected to the circuit through the circuit where the circuit breaker is located, that is, the designated buffer branch is connected.
[0046] By setting up multiple buffer branches and connecting multiple loads respectively, the problem that disconnecting the circuit breaker again will cause the normally operating primary load to shut down in the design of a single buffer branch can be solved. The complex needs of the load can be met and the loads can be connected to the circuit according to their different needs, which is convenient and flexible, and improves the stability and reliability of the system. In addition, using the buffer resistor as the common resistor of multiple buffer branches greatly reduces the cost, has a simple circuit structure, is easy to implement, and is conducive to improving the economy of the system.
[0047] In one embodiment, based on the situation that there are multiple buffer branches and multiple loads connected to the transformer excitation buffer system, there may be a situation where multiple loads request to access the circuit at the same time and multiple buffer branches need to be connected. When there are multiple buffer branches that need to be connected, the control unit can control the input time of multiple buffer branches according to the loads connected to each buffer branch to distinguish the order in which the multiple buffer branches are put into use. In this way, each load can be connected to the circuit in an orderly manner while distinguishing between the important and the urgent, so as to better manage the operation of the excitation buffer unit scientifically and avoid the situation where multiple buffer branches are connected in disorder.
[0048] Furthermore, when the control unit controls the input time of multiple buffer branches according to the load connected to each buffer branch, it can determine the input priority corresponding to the multiple buffer branches according to the preset input conditions related to the load; according to the determined input priority, the multiple buffer branches are connected in sequence.
[0049] The preset input condition can be determined based on factors such as the importance of the load, the capacity of the load transformer, and the expected continuous operation time of the load. The corresponding relationship between the preset input condition and the priority can be established in advance to determine the input priority of the buffer branch. For example, the higher the importance of the load, the higher the input priority of the corresponding buffer branch.
[0050] Furthermore, the criteria for judging the importance of the load can be determined based on factors such as the load's requirements for power supply reliability, the magnitude of the loss caused by a power outage of the load, and the number of other electrical devices supplied by the load.
[0051] In one embodiment, the main control unit can monitor the working status of each circuit breaker and contactor in the excitation buffer unit, and specifically determine whether there is a fault in the circuit. Specifically, after the main control unit sends a control signal to the circuit breaker or contactor, it can calculate the difference between the received feedback signal and the received feedback signal, and determine whether there is a fault in the circuit breaker or contactor based on the difference.
[0052] For example, the main control unit can determine based on the preset feedback duration that when the time difference between sending a control signal and receiving a feedback signal is greater than the preset feedback duration, it can judge that the corresponding circuit breaker, contactor or other device has a fault and cannot complete the instruction represented by the control signal; or, the main control unit can determine based on the historical feedback duration that when the time difference between sending a control signal and receiving a feedback signal is much greater than the historical feedback duration, it can judge that the corresponding circuit breaker, contactor or other device may have a problem, resulting in an abnormal delay in the time it takes for the device to execute an action.
[0053] By monitoring the excitation buffer unit through the control unit, it is possible to promptly determine whether there are faults or abnormalities in devices such as circuit breakers and contactors, and to promptly or even in advance handle possible problems in the circuit to improve the safety and stability of the system.
[0054] In one embodiment, when the main control unit determines that a circuit breaker, contactor or other device has a fault, it sends an alarm message so as to promptly handle the fault problem in the circuit and maintain the normal operation of the power supply system.
[0055] In addition, when there is a fault in the circuit, the main control unit can control the corresponding device to disconnect and control the opening time to be as short as possible, so as to quickly cut off the fault current and avoid the continued expansion of the fault and greater damage to the power supply system. Adjust the opening and closing time according to the fault type and load conditions In the embodiment of the present application, Figure 1 Taking the value of n as 3 as an example, the operation process of the transformer excitation buffer system is described in detail.
[0056] The transformer excitation buffer system includes three circuit breakers QF1, QF2, QF3, three contactors KM1, KM2, KM3, and a group of buffer resistors R. The buffer resistor R, the circuit breaker QF1, and the contactor KM1 form a first buffer branch connected to load 1; the buffer resistor R, the circuit breaker QF2, and the contactor KM2 form a second buffer branch connected to load 2; the buffer resistor R, the circuit breaker QF3, and the contactor KM3 form a third buffer branch connected to load 3. For example, the resistance value of the buffer resistor R can be 10Ω.
[0057] The control unit can receive switch state feedback signals of the circuit breakers QF1, QF2, QF3 and the contactors KM1, KM2, KM3, and can control the closing and opening of the circuit breakers QF1, QF2, QF3 and the contactors KM1, KM2, KM3.
[0058] When controlling the first buffer branch, the control unit first closes the buffer contactor KM1. According to the capacity of the load transformer, the closing time of the circuit breaker QF1 can be adjusted. After receiving the feedback signal that the circuit breaker QF1 has been closed, the buffer contactor KM1 is disconnected, and the load 1 has been successfully connected to the circuit.
[0059] When controlling the second buffer branch, the control unit first closes the buffer contactor KM2. According to the capacity of the load transformer, the closing time of the circuit breaker QF2 can be adjusted. After receiving the feedback signal that the circuit breaker QF2 has been closed, the buffer contactor KM2 is disconnected, and the load 2 has been successfully connected to the circuit.
[0060] When controlling the third buffer branch, the control unit first closes the buffer contactor KM3. According to the capacity of the load transformer, the closing time of the circuit breaker QF3 can be adjusted. After receiving the feedback signal that the circuit breaker QF3 has been closed, the buffer contactor KM3 is disconnected, and the load 3 has been successfully connected to the circuit.
[0061] In addition, the control unit can also judge whether the switch is faulty and cannot be opened and closed normally according to the difference between the control signal and feedback signal of the circuit breaker QF1, QF2, QF3 and the contactor KM1, KM2, KM3. If the switch is found to be faulty, the control unit can issue an alarm message and take corresponding measures.
[0062] The above is the transformer excitation buffer method and system proposed in the embodiment of the present application. Based on the same inventive idea, the embodiment of the present application also provides a transformer excitation buffer device corresponding to the above transformer excitation buffer method, such as Figure 3 shown.
[0063] Figure 3 A schematic diagram of the structure of a transformer excitation buffer device provided in an embodiment of the present application, wherein the device comprises: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to: Receive switch status feedback signals of each circuit breaker and each contactor; Based on the connectivity requirement of the designated buffer branch, controlling the contactor of the designated buffer branch to close; Controlling the closing time of the circuit breaker of the designated buffer branch according to the capacity of the load transformer corresponding to the designated buffer branch; After determining that the circuit breaker is closed, the contactor is opened to determine that the designated buffer branch is connected.
[0064] Each embodiment in the present application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for system and device embodiments, since they are basically similar to method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The equipment and methods provided in the embodiments of the present application correspond one to one, so the equipment also has beneficial technical effects similar to the corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the equipment will not be repeated here.
[0065] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.
[0066] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.
[0067] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.
[0068] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.
[0069] The above description is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any changes, modifications, equivalent substitutions or improvements that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.
Claims
1. A transformer excitation buffer system, characterized in that: It includes a plurality of circuit breakers, a plurality of contactors corresponding to the plurality of circuit breakers, and a buffer resistor; The buffer resistors are respectively connected to the contactors; One end of each circuit breaker is connected to the buffer resistor, and the other end is connected to the corresponding contactor to form a plurality of buffer branches; Each of the buffer branches is connected to each load through a corresponding load transformer.
2. The transformer excitation buffer system according to claim 1, characterized in that: The system also includes a control unit; The control unit receives the switch state feedback signals of each of the circuit breakers and the contactors, and controls the connection or disconnection of each of the buffer branches by controlling the switch states of each of the circuit breakers and the contactors.
3. A transformer excitation buffer method, applied to the transformer excitation buffer system according to any one of claims 1 to 2, characterized in that: The method comprises: Receive switch status feedback signals of each circuit breaker and each contactor; Based on the connectivity requirement of the designated buffer branch, controlling the contactor of the designated buffer branch to close; Controlling the closing time of the circuit breaker of the designated buffer branch according to the capacity of the load transformer corresponding to the designated buffer branch; After determining that the circuit breaker is closed, the contactor is opened to determine that the designated buffer branch is connected.
4. The transformer excitation buffer method according to claim 3, characterized in that: According to the capacity of the load transformer corresponding to the designated buffer branch, controlling the closing time of the circuit breaker of the designated buffer branch specifically includes: When it is determined according to a preset load transformer capacity threshold that the capacity of the load transformer corresponding to the designated buffer branch is not greater than the threshold, controlling the closing time of the circuit breaker of the designated buffer branch to be the first time; When it is determined that the capacity of the load transformer corresponding to the designated buffer branch is greater than the threshold, the closing time of the circuit breaker of the designated buffer branch is controlled to be a second time; the second time is greater than the first time.
5. The transformer excitation buffer method according to claim 4, characterized in that: The second time is positively correlated with the capacity of the load transformer.
6. The transformer excitation buffer method according to claim 3, characterized in that: The method further comprises: When there are multiple buffer branches that need to be connected, the time for connecting the multiple buffer branches is controlled according to the load connected to each buffer branch.
7. The transformer excitation buffer method according to claim 6, characterized in that: According to the load connected to each buffer branch, controlling the input time of the plurality of buffer branches specifically includes: Determining the input priorities corresponding to the plurality of buffer branches respectively according to preset input conditions related to the load; According to the input priorities, the multiple buffer branches are connected respectively.
8. The transformer excitation buffer method according to claim 3, characterized in that: The method further comprises: determining a difference between a control signal sent to the circuit breaker or the contactor and a feedback signal received; According to the difference, it is determined whether the circuit breaker or the contactor is faulty.
9. The transformer excitation buffer method according to claim 8, characterized in that: The method further comprises: When it is determined that the circuit breaker and / or contactor has a fault, an alarm message is sent.
10. A transformer excitation buffer device, comprising: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to: Receive switch status feedback signals of each circuit breaker and each contactor; Based on the connectivity requirement of the designated buffer branch, controlling the contactor of the designated buffer branch to close; Controlling the closing time of the circuit breaker of the designated buffer branch according to the capacity of the load transformer corresponding to the designated buffer branch; After determining that the circuit breaker is closed, the contactor is opened to determine that the designated buffer branch is connected.