Intelligent reclosing air switch arc suppression method and device based on zero-crossing control

Abstract

The invention relates to the technical field of intelligent electrical switches, and particularly discloses an intelligent reclosing air switch arc suppression method and device based on zero-crossing control, and the method comprises the following steps: detecting a voltage zero-crossing point and a current zero-crossing point of an AC loop, and marking an instruction issuing alignment point; the instruction issuing alignment points comprise a switching-on instruction voltage zero-crossing alignment point and a switching-off instruction current alignment point; and calculating a time window, issuing a switch-on and switch-off instruction at a corresponding window point so as to complete the switch-on operation at the voltage zero-crossing prediction point or complete the switch-off operation at the current zero-crossing prediction point, and achieving the purpose of arc suppression by approaching no current under the condition that the switch-on and switch-off completion time point is overlapped with the actual zero-crossing point. According to the intelligent reclosing air switch, the time of switching on and switching off is accurately controlled, generation of electric arcs is effectively reduced, the service life of the intelligent reclosing air switch is prolonged, and the intelligent reclosing air switch has remarkable technical advantages and market application prospects.

Description

Technical Field

[0001] The present invention specifically relates to the technical field of intelligent electrical switches, and more specifically, to a method and device for suppressing the arc of an intelligent reclosing air switch based on zero-crossing control. Background Art

[0002] When traditional air switches and existing intelligent air switches frequently switch on and off high-power capacitive or inductive loads (such as high-power energy-saving lamps, motors, charging piles, and frequency conversion devices), due to the characteristics of capacitive or inductive loads, inrush current is generated instantaneously during closing, and arcs are generated due to the voltage difference between contacts during opening (such as inductive loads), accelerating the consumption and melting of the contacts, and significantly reducing the service life; conventional solutions optimize materials and increase the contact materials or mechanical structures, but they cannot fundamentally solve the arc problem and are costly.

[0003] For timed on-off scenarios (such as intelligent power consumption management), the air switch needs to be frequently operated, resulting in the service life of traditional air switches being less than 1 / 3 of the original design; while existing intelligent air switches do not optimize the switching-on and switching-off timing in coordination with the AC power phase, and the arc suppression effect is limited, affecting long-term stable operation. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and device for suppressing the arc of an intelligent reclosing air switch based on zero-crossing control to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An intelligent reclosing air switch arc suppression method based on zero-crossing control includes the following steps:

[0007] S101. Detect the voltage zero-crossing point and current zero-crossing point of the AC circuit to mark the instruction issuing alignment point, and the instruction issuing alignment point includes the closing instruction voltage zero-crossing alignment point and the opening instruction current alignment point;

[0008] S102. Calculate the time window and issue the closing and opening instructions at the corresponding window points to complete the closing operation at the voltage zero-crossing prediction point or complete the opening operation at the current zero-crossing prediction point. When the closing and opening completion time points overlap with the actual zero-crossing point, the arc suppression purpose is achieved by approaching zero current.

[0009] Among them, the time window is between the closing instruction voltage zero-crossing alignment point and the closing instruction issuing point, and between the opening instruction current zero-crossing alignment point and the opening instruction issuing point. The specific calculation methods are as follows:

[0010] Voltage time window calculation:

[0011] T 补偿时间 = T 半周 -(T 响应延迟 modT半周 );

[0012] Calculation of current time window:

[0013] T 补偿时间 = T 全周 -(T 响应延迟 mod T 全周 );

[0014] Wherein:

[0015] T 响应延迟 = T 检测延迟 + T 机械响应 + T 补偿微调 ;

[0016] In the formula: T 补偿时间 represents the time window, mod represents taking the remainder when dividing the front and back data; T 半周 = T 全周 / 2, T 全周 is the mains cycle, T 全周 = 1 / mains frequency; T 检测延迟 represents the circuit and program detection response time; T 机械响应 represents the mechanical response delay time; T 补偿微调 represents the error compensation time.

[0017] As a further solution of the present invention: In step S101, the method for detecting the voltage zero crossing and current zero crossing of the AC circuit includes the following steps:

[0018] S201. Obtain the instantaneous voltage and current data of the AC circuit;

[0019] S202. Determine whether the current circuit breaker is in the open state. If so, detect the voltage zero crossing; otherwise, detect the current zero crossing;

[0020] S203. If no voltage zero crossing or no current zero crossing is detected, return to step S201.

[0021] As a still further solution of the present invention: In step S102, the method for performing a closing operation at the voltage zero crossing prediction point or a tripping operation at the current zero crossing prediction point includes the following steps:

[0022] S301. When the voltage zero crossing is detected, determine whether there is an actively delayed closing request that has been received. If so, calculate the closing control instruction time point according to the time window and the current zero crossing time point; when the current zero crossing is detected, determine whether there is an actively delayed tripping request that has been received. If so, calculate the tripping control instruction time point according to the time window and the current zero crossing time point;

[0023] S302. Wait for the closing control instruction time point and output the closing control instruction; wait for the opening control instruction time point and output the opening control instruction.

[0024] S303. Complete the contact closing at the voltage zero-crossing point and feedback the closing operation result; complete the contact opening near the current zero-crossing point and feedback the opening operation result.

[0025] As a further solution of the present invention: in step 301, if the active delayed closing request or the active delayed opening request is not received, continue to obtain the instantaneous voltage and current data of the AC circuit, wait for the active delayed closing request or the active delayed opening request, and if there is an active delayed closing / opening request but no effective zero-crossing signal in the execution thread times out for 2*T 全周 After that, it is determined that the zero-crossing control is invalid, and the closing / opening instruction will be enforced.

[0026] As a further solution of the present invention: in step S301, the closing control instruction time point is the output point of the closing control instruction, and the method for calculating the closing control instruction time point according to the time window is:

[0027] T’ 合闸指令 = T’ 电压过零 + T 补偿时间

[0028] Where: T’ 合闸指令 represents the output time marking point of the closing control instruction, T’ 电压过零 represents the detected voltage zero-crossing time marking point, and T 补偿时间 represents the time window.

[0029] As a further solution of the present invention: in step S301, the opening control instruction time point is the output point of the opening control instruction, and the method for calculating the opening control instruction time point according to the time window is:

[0030] T’ 分闸指令 = T’ 电流过零 + T 补偿时间

[0031] Where: T’ 分闸指令 represents the output time marking point of the closing control instruction, T’ 电流过零 represents the detected current zero-crossing time marking point, and T 补偿时间 represents the time window.

[0032] An intelligent reclosing air switch arc suppression device based on zero-crossing control, including a detection module, a zero-crossing detection module, a control unit and an actuator, where:

[0033] The detection module is used to obtain the instantaneous voltage and current data of the AC circuit;

[0034] The zero-crossing detection module detects the voltage zero-crossing point and current zero-crossing point of the AC circuit according to the instantaneous voltage and current data of the AC circuit;

[0035] The control unit calculates the opening or closing command output point according to the time window, voltage zero-crossing point, and current zero-crossing point, and outputs the opening or closing command after the corresponding time point to ensure that the actual opening and closing time points coincide with the predicted zero-crossing point;

[0036] The actuator starts to execute the operation after receiving the closing or opening command, and completes the closing or opening operation at the predicted voltage zero-crossing point or the predicted current zero-crossing point.

[0037] As a further solution of the present invention: The actuator includes an electric reclosing mechanism, a voltage tripping mechanism, a short-circuit protection electromagnetic tripping structure, and a bimetal overload detection and execution protection structure. In addition to realizing the normal timing and remote delay zero-crossing control opening and closing operations, the electric reclosing mechanism ensures that other emergency abnormal situations can directly and immediately trip and protect through the voltage tripping mechanism, the short-circuit protection electromagnetic tripping structure, and the bimetal overload detection and execution protection structure.

[0038] Compared with the prior art, the beneficial effects of the present invention are: By precisely controlling the timing of closing and tripping, the present invention effectively reduces the generation of electric arcs, extends the service life of the intelligent reclosing air switch, and has significant technical advantages and market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is the flow chart of the intelligent reclosing air switch arc suppression method based on zero-crossing control Figure 1

[0040] Figure 2 is the flow chart of the intelligent reclosing air switch arc suppression method based on zero-crossing control Figure 2 .

[0041] Figure 3 is the system block diagram of the intelligent reclosing air switch arc suppression device based on zero-crossing control. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] Please refer to Figure 1 - Figure 2 , in the embodiments of the present invention, an intelligent reclosing air switch arc suppression method based on zero-crossing control includes the following steps:

[0044] S101. Detect the voltage zero-crossing point and current zero-crossing point of the AC circuit to mark the instruction issuance alignment point. The instruction issuance alignment point includes the closing instruction voltage zero-crossing alignment point and the opening instruction current alignment point. The voltage zero-crossing point refers to the moment when the instantaneous voltage value is zero when the AC voltage waveform transitions from the positive half-cycle to the negative half-cycle (or in the reverse direction). In an ideal sine wave, there are two voltage zero-crossing points in each cycle (positive → negative, negative → positive); the current zero-crossing point refers to the moment when the instantaneous current value is zero when there is a current load and the AC current waveform transitions from the positive half-cycle to the negative half-cycle (or in the reverse direction). There are a fixed number of single or multiple zero-crossing points in each cycle, and the scenario with intermittent zero current is based on the moment when the instantaneous current value just enters zero.

[0045] S102. Calculate the time window, issue the closing and opening instructions at the corresponding window points, and complete the closing operation at the voltage zero-crossing prediction point or the opening operation at the current zero-crossing prediction point. When the closing and opening completion time points overlap with the actual zero-crossing point, it is close to achieving the purpose of arc suppression without current.

[0046] Among them, the time interval between the closing instruction voltage zero-crossing alignment point and the closing instruction issuance point, and the time interval between the opening instruction current zero-crossing alignment point and the opening instruction issuance point are the time windows. The specific calculation methods are as follows (since the positive and negative half-cycles of the voltage are symmetric, half-cycle zero-crossing detection can be used to improve the response speed. The current zero-crossing scenario is complex, and only single zero-crossing detection per week is applicable):

[0047] Voltage time window calculation:

[0048] T 补偿时间 = T 半周 -(T 响应延迟 mod T 半周 );

[0049] Current time window calculation:

[0050] T 补偿时间 = T 全周 -(T 响应延迟 mod T 全周 );

[0051] Among them:

[0052] T 响应延迟 = T 检测延迟 + T 机械响应 + T 补偿微调 ;

[0053] Among them: T 补偿时间 represents the time window, mod represents taking the remainder when dividing the previous and subsequent data; T 半周 = T 全周 / 2, T 全周Is the mains power cycle, T 全周 = 1 / mains power frequency. Taking 50Hz mains power as an example, T 全周 = 1 / 50Hz = 0.02 seconds, corresponding to 20mS, T 半周 = T 全周 / 2 = 10mS;

[0054] T 检测延迟 Represents the response delay time, that is, the delay between the actual zero-crossing point of voltage and current and the program response point. If it is hardware detection, this delay generally comes from a small voltage difference between the zero-crossing threshold of the zero-crossing detection element and the actual zero-crossing point, or the capacitance of the connection transmission loop and the MCU interruption response time. If it is software detection, this delay generally comes from the task execution time between the sampling data processing, zero-crossing detection processing program and the processing response program. This value is generally fixed after experimental testing in the R & D stage.

[0055] In the zero-crossing detection of the embodiment of the present application, a software algorithm scheme is adopted. To improve the processing efficiency, positive and negative markings are directly applied to the sampling signal. In the voltage zero-crossing detection scheme, to avoid noise interference and ensure effectiveness, peak limiting is added. When the positive and negative markings switch, it is judged whether the current voltage peak value is greater than 100V. If it is greater, a voltage zero-crossing event is pushed. In the current zero-crossing detection scheme, to avoid noise interference and ensure effectiveness, peak limiting is also added. Only at the first time when the positive is switched to negative marking in each week, it is judged whether the current current peak value is greater than 5A. If it is greater, a current zero-crossing event is pushed.

[0056] T 机械响应 Represents the mechanical response delay time. The reclosing structure starts to operate from the starting position of the limit switch to the response time when the driving contact completes closing or opening after receiving the driving closing and opening signals. The reclosing structure requires accurate starting limit detection and stable action speed, so as to accurately control the execution time fluctuation range within 1mS. The optimization scheme includes improving the driving execution speed to reduce the fluctuation time. The closing and opening times are generally different and different configuration values are used. This value is generally fixed after experimental testing in the R & D stage.

[0057] T 补偿微调Indicates the error compensation time, which is the correction time compensation when the reclosing structure has different execution times for different individuals due to accessory dimensions, installation errors, component errors, etc., and has a maximum range limit, such as ±3mS. This value can be obtained through factory calibration and dynamic calibration. Factory calibration scheme: After the device is connected to a resistive load, perform active delay synchronous closing and opening, capture the current waveform during the switching moment, and after verifying that it is a resistive load (when the current phase is consistent with the voltage phase, it is verified as a resistive load), for closing, capture according to the starting position of the current waveform and calculate the corresponding error compensation fine-tuning time; for opening, capture according to the ending position of the current waveform and calculate the corresponding error compensation fine-tuning time. Dynamic calibration is similar to factory calibration. In each closing case, if it is verified that the current startup is a resistive load, use the previously captured current waveform at the switching moment, calculate the corresponding error compensation fine-tuning time and temporarily update it for the next same operation. In the case of opening, if it is a resistive load before opening and greater than the default threshold (such as 5A), use the captured current waveform at the switching moment to calculate the corresponding error compensation fine-tuning time and temporarily update it for the next same operation.

[0058] In step S101 of the embodiment of the present application, the method for detecting the voltage zero-crossing point and current zero-crossing point of the AC circuit includes the following steps:

[0059] S201. Obtain the instantaneous voltage and current data of the AC circuit;

[0060] S202. Determine whether the current circuit breaker is in the open state. If so, detect the voltage zero-crossing point; otherwise, detect the current zero-crossing point;

[0061] S203. If the voltage zero-crossing point or the current zero-crossing point is not detected, return to step S201.

[0062] In step S102 of the embodiment of the present application, the method for performing the closing operation at the voltage zero-crossing prediction point or the opening operation at the current zero-crossing prediction point includes the following steps:

[0063] S301. When the voltage zero-crossing point is detected, determine whether there is an actively delayed closing request that has been received. If so, calculate the time point of the closing control command according to the time window; when the current zero-crossing point is detected, determine whether there is an actively delayed opening request that has been received. If so, calculate the time point of the opening control command according to the time window;

[0064] It should be noted that in step 301 of the embodiment of the present application, if the actively delayed closing request or the actively delayed opening request is not received, return to step S201 to continue obtaining the instantaneous voltage and current data of the AC circuit and wait for the actively delayed closing request or the actively delayed opening request.

[0065] It should also be noted that in step S301 of the present application, the time point of the closing control instruction is the output point of the closing control instruction. The method for calculating the time point of the closing control instruction according to the time window is as follows:

[0066] T’ 合闸指令 = T’ 电压过零 + T 补偿时间

[0067] In the formula: T’ 合闸指令 represents the output time marking point of the closing control instruction, T’ 电压过零 represents the detected voltage zero-crossing time marking point, and T 补偿时间 represents the time window;

[0068] In step S301 of the present application, the time point of the opening control instruction is the output point of the opening control instruction. The method for calculating the time point of the opening control instruction according to the time window is as follows:

[0069] T’ 分闸指令 = T’ 电流过零 + T 补偿时间

[0070] In the formula: T’ 分闸指令 represents the output time marking point of the closing control instruction, T’ 电流过零 represents the detected current zero-crossing time marking point, and T 补偿时间 represents the time window.

[0071] S302. Wait for the time point of the closing control instruction and output the closing control instruction; wait for the time point of the opening control instruction and output the opening control instruction;

[0072] S303. Complete the contact closing at the voltage zero-crossing point and feedback the closing operation result; complete the contact opening near the current zero-crossing point and feedback the opening operation result.

[0073] In addition, in the embodiment of the present application, the detected voltage zero-crossing point and current zero-crossing point can also be obtained through a hardware detection scheme. The specific method is to monitor the current positive and negative states of the voltage or current through components such as crystal triodes and optocouplers, and then input them to the relevant IO of the MCU. The MCU processing program can be configured for interrupt response, and the time point of the state transition captured is the corresponding zero-crossing point. This scheme can greatly reduce the MCU's data sampling requirements and processing computing resource requirements, and adapt to the low-cost requirement scheme.

[0074] Please refer to Figure 3 , the embodiment of the present invention also discloses an intelligent reclosing air switch arc suppression device based on zero-crossing control, including a detection module 100, a zero-crossing detection module 200, a control unit 300, and an actuator 400, where:

[0075] The detection module 100 is used to obtain the instantaneous voltage and current data of the AC circuit. In this embodiment, the voltage is detected by connecting a resistor voltage divider to the chip AD for acquisition, and the current is detected by a current transformer and connected to the chip AD for acquisition. The sampling rate is 6.4KHz, and the zero-crossing point is captured in real time through a program algorithm.

[0076] The zero-crossing detection module 200 detects the voltage zero-crossing point and current zero-crossing point of the AC circuit according to the instantaneous voltage and current data of the AC circuit. Among them, the zero-crossing detection module includes a voltage zero-crossing detection unit and a current zero-crossing detection unit;

[0077] The control unit 300 needs to calculate the time window and the instruction time point, and issue the closing and opening commands at the corresponding window instruction time point, and complete the closing operation at the voltage zero-crossing prediction point or complete the opening operation at the current zero-crossing prediction point. The specific calculation is as follows:

[0078] Calculation of the closing voltage time window and the instruction time point:

[0079] T 补偿时间 = T 半周 -(T 响应延迟 mod T 半周 );

[0080] T’ 合闸指令 = T’ 电压过零 + T 补偿时间

[0081] Calculation of the opening current time window and the instruction time point:

[0082] T 补偿时间 = T 全周 -(T 响应延迟 mod T 全周 );

[0083] T’ 分闸指令 = T’ 电流过零 + T 补偿时间

[0084] Where:

[0085] T 响应延迟 = T 检测延迟 + T 机械响应 + T 补偿微调 ;

[0086] In the embodiment of the present application, the control unit 300 selects a 32-bit ARM Cortex-M4 microcontroller.

[0087] The actuator 400 performs a closing operation at the voltage zero-crossing prediction point or an opening operation at the current zero-crossing prediction point.

[0088] In the embodiments of the present application, the actuator 400 includes an electric reclosing mechanism, a voltage tripping mechanism, a short-circuit protection electromagnetic tripping structure (which can continue to work in case of control circuit failure), and a bimetal overload detection and execution protection structure (which can continue to work in case of control circuit failure). It should be noted that the electric reclosing mechanism refers to a mechanical structure that can achieve automatic reclosing through motor drive. In an intelligent circuit breaker, when a fault is detected to be cleared or there is a timing requirement, a remote closing requirement, etc., the circuit can be automatically reclosed. At this time, the electric mechanism will start, driving the contacts to close. This part needs to be connected to the control circuit, and the MCU controls the motor drive circuit, and then drives the gear or link mechanism. In the present application, the active opening and closing are achieved by driving the electric reclosing mechanism. In this embodiment, the reclosing execution part is a motor-driven gear reduction mechanism, ensuring accurate starting point detection and the closing execution time fluctuating within 1 mS.

[0089] Different from the active opening and closing of the above-mentioned electric reclosing mechanism, the voltage tripping mechanism and the short-circuit protection electromagnetic tripping structure are mainly used for passive protection of the circuit. Specifically, the voltage tripping mechanism refers to a device whose electromagnetic structure can trigger mechanical tripping to trip the circuit breaker when the power supply voltage is connected. It is driven by a circuit and is mainly applied to the opening operation during leakage protection and severe overvoltage and undervoltage protection. It operates through circuit drive and has a faster response speed compared to the electric reclosing mechanism. The short-circuit protection electromagnetic tripping structure is a common electromagnetic tripping device in traditional circuit breakers. When a large short-circuit current generates enough magnetic field, the electromagnet directly operates without circuit control and is directly connected in series in the main circuit, which can directly trigger tripping and opening to achieve short-circuit protection of the circuit. The bimetal overload detection and execution protection structure bends when the bimetal strip is heated due to current overload, pushing the mechanical structure to disconnect the contacts. The bimetal overload detection and execution protection structure is also connected in series in the main circuit and relies on heat to bend, which is a mechanically connected tripping device.

[0090] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0091] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An intelligent reclosing air switch arc suppression method based on zero-crossing control, characterized in that, It includes the following steps: S101. Detect the voltage zero-crossing point and current zero-crossing point of the AC circuit to mark the instruction issuance alignment points, where the instruction issuance alignment points include the voltage zero-crossing alignment point for the closing instruction and the current alignment point for the opening instruction; S102. Calculate the time window, issue the closing and opening instructions at the corresponding window points, and complete the closing operation at the voltage zero-crossing prediction point or complete the opening operation at the current zero-crossing prediction point; Among them, the time between the voltage zero-crossing alignment point for the closing instruction and the closing instruction issuance point, and the time between the current zero-crossing alignment point for the opening instruction and the opening instruction issuance point are the time windows, and the calculation method is as follows: Voltage time window calculation: T 补偿时间 = T 半周 -(T 响应延迟 mod T 半周 ); Current time window calculation: T 补偿时间 = T 全周 -(T 响应延迟 mod T 全周 ); Wherein: T 响应延迟 = T 检测延迟 + T 机械响应 + T 补偿微调 ; Where: T 补偿时间 represents the time window, and mod represents taking the remainder after dividing the front and back data; T 半周 = T 全周 / 2, T 全周 is the mains power cycle, T 全周 = 1 / mains power frequency; T 检测延迟 represents the circuit and program detection response time; T 机械响应 represents the mechanical response delay time; T 补偿微调 represents the error compensation time.

2. The intelligent reclosing air switch arc suppression method based on zero-crossing control according to claim 1, wherein In step S101, the method for detecting the voltage zero-crossing point and current zero-crossing point of the AC circuit includes the following steps: S201. Obtain the instantaneous voltage and current data of the AC circuit; S202. Determine whether the current circuit breaker is in the open state. If so, detect the voltage zero-crossing point; otherwise, detect the current zero-crossing point; S203. If the voltage zero-crossing point or the current zero-crossing point is not detected, return to step S201.

3. The intelligent reclosing air switch arc suppression method based on zero-crossing control according to claim 2, wherein In step S102, the method for performing the closing operation at the voltage zero-crossing prediction point or the opening operation at the current zero-crossing prediction point includes the following steps: S301. When the voltage zero-crossing point is detected, determine whether there is an actively delayed closing request that has been received. If so, calculate the closing control instruction time point according to the time window; when the current zero-crossing point is detected, determine whether there is an actively delayed opening request that has been received. If so, calculate the opening control instruction time point according to the time window; S302. Wait for the closing control instruction time point and output the closing control instruction; wait for the opening control instruction time point and output the opening control instruction; S303. Complete the contact closing at the voltage zero-crossing point and feedback the closing operation result; complete the contact opening near the current zero-crossing point and feedback the opening operation result.

4. The intelligent reclosing air switch arc suppression method based on zero-crossing control according to claim 3, characterized in that, In step 301, if no active delayed closing request or no active delayed opening request is received, continue to obtain the instantaneous voltage and current data of the AC circuit, wait for the active delayed closing request or the active delayed opening request. If there is an active delayed closing / opening request in the execution thread but there is no valid zero-crossing signal and it times out for 2*T 全周 after that, it is determined that the zero-crossing control is invalid, and the closing / opening command will be enforced.

5. The intelligent reclosing air switch arc suppression method based on zero-crossing control according to claim 3, characterized in that, In step S301, the closing control instruction time point is the output point of the closing control instruction, and the method for calculating the closing control instruction time point according to the time window is: T’ 合闸指令 = T’ 电压过零 + T 补偿时间 Where: T' 合闸指令 represents the output time marking point of the closing control command, T' 电压过零 represents the detected zero-crossing time marking point of the voltage, T 补偿时间 represents the time window.

6. The intelligent reclosing air switch arc suppression method based on zero-crossing control according to claim 3, characterized in that In step S301, the opening control instruction time point is the output point of the opening control instruction, and the method for calculating the opening control instruction time point according to the time window is: T’ 分闸指令 = T’ 电流过零 + T 补偿时间 Where: T' 分闸指令 represents the output time marking point of the closing control command, T' 电流过零 represents the detected current zero-crossing time marking point, T 补偿时间 represents the time window.

7. An intelligent reclosing air switch arc suppression device based on zero-crossing control, characterized in that, It includes a detection module, a zero-crossing detection module, a control unit, and an actuator, where: The detection module is used to obtain the instantaneous voltage and current data of the AC circuit; The zero-crossing detection module detects the voltage zero-crossing point and current zero-crossing point of the AC circuit according to the instantaneous voltage and current data of the AC circuit; The control unit calculates the time window based on the prediction algorithm, and calculates the voltage zero-crossing prediction point and current zero-crossing prediction point according to the time window, voltage zero-crossing point, and current zero-crossing point; The actuator performs the closing operation at the voltage zero-crossing prediction point or the opening operation at the current zero-crossing prediction point.

8. The intelligent reclosing air switch arc suppression device based on zero-crossing control according to claim 7, characterized in that, The actuator includes an electric reclosing mechanism, a voltage tripping mechanism, a short-circuit protection electromagnetic tripping structure, and a bimetal overload detection and execution protection structure.

Images