A monitoring and control method and system for realizing synchronous wire explosion based on double electrodes

Abstract

The application discloses a kind of monitoring regulation methods and systems based on double electrode realization synchronous metal wire explosion, it is related to high voltage switch technical field, including: obtaining the time difference that first trigger gap and second trigger gap detect current peak under normal operating state of target converter transformer, as current time difference;Periodically obtain current time difference and store time difference table;When target converter transformer fails, select the nearest current time difference based on time difference table, as target time difference;Based on target time difference, adjust the signal trigger time of first trigger gap or second trigger gap, realize the synchronous arrival of current peak of two trigger gaps.It realizes the synchronous release of charged particles of metal wire explosion of different trigger gaps, and further improves the reliability of equipment, meets the development needs of reliable, safe and efficient power grid.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switch technology, and more specifically to a monitoring and control method and system for synchronous metal wire bursting based on dual electrodes. Background Technology

[0002] Converter transformers are high-voltage oil-filled devices characterized by their high voltage level and high cost. While converter transformer failures are rare, a penetrating high-energy discharge fault inside the oil-filled equipment can cause significant current and arcing, leading to oil decomposition, high voltage, and high temperature. This can easily cause the tank structure to tear, explode, and catch fire, resulting in widespread power outages and a broad impact. The grounding trigger gap is a protective device that rapidly transfers internal arcing to the ground. When the trigger gap receives a protection action command from the substation's monitoring equipment, the gap's metal wire bursts, releasing charged particles to achieve rapid grounding.

[0003] For dual-electrode trigger gaps, a common solution for synchronously ejecting charged particles is as follows: For time synchronization, power dispatch uses GPS satellite signals to obtain a reference time after a certain period, and different devices then undergo clock synchronization control; voltage is maintained at its highest level, and under the control of the synchronized clock system, the background protection system sends protection action commands, waiting for the protection device to be triggered to achieve protection. For newly installed dual-electrode trigger grounding gaps, the circuit impedance has been calculated to ensure synchronous triggering, guaranteeing simultaneous release of charged particles from the metal wire. However, since the trigger gap is normally in standby mode, the impedance of the trigger circuit will change over time, causing deviations in the peak arrival time after triggering, especially affecting dual-electrode trigger gaps more severely. Furthermore, direct impedance monitoring requires multi-parameter monitoring, which is difficult to implement.

[0004] Currently used trigger gap switches have relatively mature technologies such as three-electrode field distortion gas switches, multi-stage multi-channel gas switches, and trigertron-type gas switches, and have been widely used in pulse power fields such as electromagnetic launch and primary ignition of nuclear fusion. However, the detection, judgment, and action time are relatively long, and they cannot cut off faulty circuits in time.

[0005] Therefore, how to achieve the synchronous release of charged particles from metal wires with different trigger gaps is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of the above problems, the present invention is proposed to provide a monitoring and control method and system for synchronous metal wire explosion based on dual electrodes to overcome or at least partially solve the above problems. This method enables the synchronous release of charged particles from metal wire explosions with different trigger gaps, thereby improving the reliability of the equipment and meeting the needs of reliable, safe and efficient power grid development.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, embodiments of the present invention provide a monitoring and control method for synchronous metal filament explosion based on dual electrodes, comprising: The time difference between the detection of the current peak value in the first trigger gap and the second trigger gap under normal operating conditions of the target converter transformer is obtained as the current time difference; The current time difference is periodically acquired and stored to obtain a time difference table; When the target converter transformer fails, the nearest current time difference is selected as the target time difference based on the time difference table; Based on the target time difference, adjust the signal triggering time of the first trigger gap or the second trigger gap to achieve synchronous arrival of the current peak of the two trigger gaps.

[0009] In one embodiment, the method for obtaining the current time difference is as follows: Under the normal operating condition of the target converter transformer, the highest voltage of the first trigger gap and the second trigger gap is obtained; Based on different proportional values ​​of the highest voltage, the target voltage at the same frequency is used; Based on the target voltage at the same frequency, the time difference between the detection of the current peak value in the first trigger gap and the second trigger gap is obtained; The absolute value of the time difference is used as the current time difference.

[0010] In one embodiment, the time difference of the current peak is obtained by: The curve of the current value changing with time under different target voltages at the same frequency during the first trigger gap is obtained as the first curve. The peak value of the first curve is used as the first current peak value; The time corresponding to the first current peak value is used as the first peak time; Obtain the curve of the current value changing with time under different target voltages at the same frequency for the second trigger gap, and use it as the second curve; The peak value of the second curve is used as the second current peak value; The second peak time is taken as the time corresponding to the second current peak. The time difference of the current peak is based on the difference between the first peak time and the second peak time.

[0011] In one embodiment, the first trigger gap includes a first rectifier charging circuit, a first control protection circuit, and a first metal wire explosion trigger cavity connected in sequence. A first current sensor is provided between the first control protection circuit and the first metal wire explosion triggering cavity to detect the change of current flowing through the first triggering gap over time. The second trigger gap includes a first rectifier charging circuit, a second control and protection circuit, and a second metal wire explosion trigger cavity connected in sequence; A second current sensor is provided between the second control and protection circuit and the second metal wire explosion triggering chamber to detect the change of current flowing through the second triggering gap over time.

[0012] In one embodiment, the time difference table acquisition method is as follows: The current time difference is reacquired every preset time interval, and the corresponding acquisition time is recorded. Based on the acquisition time, the corresponding current time difference is stored in order from farthest to nearest to obtain the time difference table.

[0013] In one embodiment, it also includes: Based on the time difference table, plot the curve of the current time difference as a function of the acquisition time; Based on the change curve, determine whether the current time difference exceeds the fault threshold; If so, it indicates that the impedance change of the trigger circuit is abnormal. The current time difference exceeding the fault threshold is marked as an abnormal time difference, and an impedance abnormality signal is generated and sent to relevant personnel for processing until normal is restored. Otherwise, it indicates that the impedance change of the trigger circuit is normal, and monitoring should continue.

[0014] In one embodiment, the method for obtaining the target time difference is as follows: When the target converter transformer fails, determine whether the abnormal time difference exists based on the time difference table; If so, the target time difference is the most recent current time difference preceding the abnormal time difference; Otherwise, the most recently acquired current time difference is selected as the target time difference based on the acquisition time.

[0015] In one embodiment, the signal trigger time adjustment method is as follows: Based on the time difference table, the first peak time and the second peak time corresponding to the first trigger gap and the second trigger gap are obtained; Based on the comparison between the first peak time and the second peak time, the trigger gap corresponding to the larger peak time is taken as the delayed trigger gap, and the trigger gap corresponding to the smaller peak time is taken as the normal trigger gap. The signal triggering time based on the normal triggering gap is used as the reference time; Based on the reference time, the target time difference is triggered in advance, which serves as the signal trigger time of the hysteresis trigger, so that the current peaks of the first trigger gap and the second trigger gap can arrive synchronously.

[0016] In one embodiment, it also includes: The voltage in the first trigger gap capacitor is used as a reference voltage, and the voltage in the capacitor on the second trigger gap is controlled by adjusting the PWM duty cycle, so that the voltage values ​​stored in the capacitors of the first and second trigger gaps are the same.

[0017] In a second aspect, embodiments of the present invention provide a monitoring and control system for synchronous metal wire explosion based on dual electrodes, used to execute a monitoring and control method for synchronous metal wire explosion based on dual electrodes as described in any of the first aspects, comprising: a normal time difference acquisition module, a time difference table acquisition module, a target time difference acquisition module, and a trigger time adjustment module; The normal time difference acquisition module is used to acquire the time difference between the detection of the current peak value in the first trigger gap and the second trigger gap under the normal operating state of the target converter transformer, and use it as the current time difference. The time difference table acquisition module is used to periodically acquire the current time difference and store it to obtain a time difference table; The target time difference acquisition module is used to select the nearest current time difference as the target time difference based on the time difference table when the target converter transformer fails. The trigger time adjustment module is used to adjust the signal trigger time of the first trigger gap or the second trigger gap based on the target time difference, so as to realize the synchronous arrival of the current peak of the two trigger gaps.

[0018] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a monitoring and control method and system for synchronous metal wire explosion based on dual electrodes, which has the following beneficial effects: 1. This invention can improve the current function of monitoring the voltage of different sets of equipment separately, but the small voltage changes cannot be fed back and regulated. It improves the open-loop control of the controller, that is, sends trigger signals at the same time, and improves the uncontrollable behavior of whether the peak value of the charged plasma ejected in the trigger cavity reaches simultaneously due to impedance changes, thus providing the strongest protection effect for the control system.

[0019] 2. This invention can be used in conjunction with current bypass trigger gaps. This method can quickly, easily, and cost-effectively achieve signal synchronization, improving the current control system's reliance on multiple monitoring signals, simplifying the complexities of real-time control, increasing production efficiency, and enhancing product reliability. It also provides technical expertise for converter transformer protection devices, achieving considerable economic benefits and creating sustainable incremental business.

[0020] 3. The present invention can adjust the trigger signal in a timely manner, which can improve the problem of the current peak not arriving at the same time due to impedance matching failure. The structure is simple and more stable, which improves the stability of the product and helps to reduce costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a flowchart of a monitoring and control method for synchronous metal wire explosion based on dual electrodes, provided in an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the monitoring quantities of the voltage and current sensors provided in the embodiments of the present invention.

[0024] Figure 3 This is a circuit topology diagram of a ground gap trigger provided in an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the energy storage voltage conditioning circuit provided in an embodiment of the present invention.

[0026] Reference numerals in the attached figures: 1-First rectifier charging circuit, 2-Second rectifier charging circuit, 3-Second control and protection circuit, 4-First control and protection circuit, 5-Second current sensor, 6-First current sensor, 7-Second metal wire explosion trigger chamber, 8-First metal wire explosion trigger chamber. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1 Currently used trigger gap switches have relatively mature technologies such as three-electrode field distortion gas switches, multi-stage multi-channel gas switches, and trigertron-type gas switches, and have been widely used in pulse power fields such as electromagnetic launch and primary ignition of nuclear fusion. However, the trigger protection time is still not fast enough.

[0029] Among them, the three-electrode field-distortion gas switch is a gas spark switch that utilizes the principle of electric field distortion to achieve rapid conduction, commonly used in pulsed power systems. Its main disadvantages include: a) The trade-off between time delay and jitter: While a porous trigger electrode structure can reduce time delay, it increases jitter; conversely, optimizing the structure to reduce jitter (such as using a symmetrical design) may not significantly shorten the time delay. b) Instability of pre-ionization: Some designs use pre-ionization technology to provide initial electrons, but the generation, adsorption, and diffusion of free electrons are random, increasing the uncertainty of time delay and exacerbating trigger jitter. c) Complexity of structural design: To achieve low inductance and a uniform electric field, the trigger electrode needs precise design (such as a centrally perforated disk or a ring-shaped porous structure), which places high demands on manufacturing processes and material consistency.

[0030] Multi-stage, multi-channel gas switches: used to achieve multi-channel synchronous discharge, commonly found in new pulse power sources such as LTDs (linear transformers). Their disadvantages include: a) Significant individual differences in synchronization performance: different switches exhibit individual variations in self-breakdown and triggering characteristics, leading to poor synchronization of multi-channel discharges and affecting the superposition effect of output current pulses. b) Limited operational stability: under high voltage and high current, the synchronous discharge performance of the switch is extremely sensitive to electrode structure, gas pressure, and insulation support design. For example, even with optimized electrode and support structures, extensive experimental screening of switches with consistent performance is still required to achieve good synchronization. c) High system complexity: multi-stage structures require precise timing control and uniform electric field distribution, increasing the overall system complexity and maintenance difficulty.

[0031] Triggertron gas switches are three-electrode trigger switches characterized by high repetition rate and fast response. Their disadvantages include: a) High trigger energy requirements: Achieving fast and stable triggering may require higher trigger voltages or energy, increasing the complexity and cost of auxiliary circuitry. b) Lifespan and durability issues: Under high repetition rate operation, the electrodes are susceptible to ablation and corrosion, leading to performance degradation over time and affecting long-term stability.

[0032] Based on the problems existing in the gas switches used in the prior art, the key to ensuring the effectiveness of arc extinguishing in this invention lies in how to ensure the synchronization of the injected charged plasma. Considering the impedance changes in the conductor caused by electromagnetic changes in a strong electromagnetic environment, and the impedance changes caused by physical and chemical corrosion after long-term operation, both of these impedance changes affect the peak arrival time of the trigger signal. Figure 1 As shown, this invention discloses a monitoring and control method for synchronous metal wire explosion based on dual electrodes, comprising the following steps. For ease of description, these steps are numbered S1 to S4, and these numbers are not intended to limit the sequential relationship between the various steps of this invention: S1 obtains the time difference between the detection of the current peak value in the first trigger gap and the second trigger gap under normal operating conditions of the target converter transformer, and uses it as the current time difference.

[0033] Furthermore, the current time difference is obtained as follows: Under the normal operating conditions of the target converter transformer, obtain the highest voltage of the first trigger gap and the second trigger gap; Based on different proportional values ​​of the highest voltage, the target voltage at the same frequency is used; Based on the target voltage at the same frequency, the time difference between the detection of the current peak value in the first trigger gap and the second trigger gap is obtained; The absolute value of the time difference is used as the current time difference.

[0034] Furthermore, the time difference of the current peak value is obtained as follows: like Figure 2 As shown, the first trigger gap A is obtained at different target frequencies with a voltage of 0.6U. AMax ~U AMax Below, current value i A The curve showing how the curve changes over time is used as the first curve. The peak value of the first curve is used as the first current peak value i. AMax ; The time corresponding to the first current peak value is taken as the first peak value time t. A ; Obtain the second trigger gap at a voltage of 0.6U at the same frequency as different targets. BMax ~U BMax Below, current value i B The curve showing how it changes over time serves as the second curve. The peak value of the second curve is used as the second current peak value i. BMax ; The time corresponding to the second current peak value is taken as the second peak value time t. B ; Based on the first peak time t A With the second peak time t BThe difference is used as the time difference of the current peak value; The absolute value of the time difference is used as the current time difference Δt.

[0035] Furthermore, to prevent current changes caused by impedance variations, different voltages are applied, and the current changes over time are detected. The impedance is then indirectly calculated using i=u / (R+jX).

[0036] Furthermore, such as Figure 3 As shown, the first trigger gap includes a first rectifier charging circuit 1, a first control and protection circuit 4, and a first metal wire explosion trigger cavity 8 connected in sequence; A first current sensor 6 is provided between the first control protection circuit 4 and the first metal wire explosion triggering chamber 8 to detect the change of current flowing through the first trigger gap over time. The second trigger gap includes a second rectifier charging circuit 2, a second control and protection circuit 3, and a second metal wire explosion trigger cavity 7 connected in sequence; A second current sensor 5 is provided between the second control and protection circuit 3 and the second metal wire explosion triggering chamber 7 to detect the change of current flowing through the second trigger gap over time.

[0037] Furthermore, the first metal wire explosion trigger chamber 8 and the second metal wire explosion trigger chamber 7 are installed in a sealed trigger chamber and filled with low-pressure SF6 protective gas.

[0038] S2 periodically obtains the current time difference and stores it to obtain a time difference table.

[0039] Furthermore, the method for obtaining the time difference table is as follows: The current time difference is retrieved again at preset intervals, and the corresponding retrieval time is recorded. Based on the acquisition time, the corresponding current time difference is stored in order from farthest to nearest, thus obtaining the time difference table.

[0040] Furthermore, it also includes: Plot the curve of the current time difference as the acquisition time based on the time difference table; Determine whether there is a current time difference exceeding the fault threshold based on the change curve; If so, it indicates that the impedance change of the trigger circuit is abnormal. The current time difference exceeding the fault threshold will be marked as an abnormal time difference, and an impedance abnormality signal will be generated and sent to relevant personnel for processing until normal is restored. Otherwise, it indicates that the impedance change of the trigger circuit is normal, and monitoring should continue.

[0041] Furthermore, by acquiring the time difference table, it has a fault recording function, which stores the data in the background every 2 to 3 hours, facilitating background data processing and viewing of equipment status information.

[0042] When the target converter transformer fails, S3 selects the nearest current time difference based on the time difference table as the target time difference.

[0043] Furthermore, the method for obtaining the target time difference is as follows: When the target converter transformer fails, the time difference table is used to determine whether there is an abnormal time difference. If so, the target time difference is the most recent current time difference before the abnormal time difference. Otherwise, the most recently acquired current time difference is selected as the target time difference based on the acquisition time.

[0044] S4 adjusts the signal triggering time of the first or second triggering gap based on the target time difference, so as to achieve synchronous arrival of the current peak of the two triggering gaps.

[0045] Furthermore, the signal trigger time adjustment method is as follows: The first peak time and the second peak time corresponding to the first trigger gap and the second trigger gap are obtained based on the time difference table; Based on the comparison between the first peak time and the second peak time, the trigger gap corresponding to the larger peak time is taken as the delayed trigger gap, and the trigger gap corresponding to the smaller peak time is taken as the normal trigger gap. The signal triggering time based on the normal triggering gap is used as the reference time; Based on the reference time and the target time difference trigger, the signal trigger time of the lag trigger is used to ensure that the current peaks of the first trigger gap and the second trigger gap arrive synchronously.

[0046] Furthermore, by adjusting the triggering time of the delayed trigger gap, the metal wire bursts and releases charged particles simultaneously, allowing grounding to be achieved within hundreds of microseconds to clear the arcing fault. This improves equipment reliability and meets the needs of a reliable, safe, and efficient power grid development.

[0047] Furthermore, for the dual-electrode trigger gap, in order to achieve high-energy, synchronous ejection of charged particles, the following operation is required: For high energy: the capacitor that needs to provide energy to the trigger gap has the highest stored voltage, and the voltage values ​​of the first trigger gap and the second trigger gap are the same; For synchronous triggering: Under the control of the synchronous clock system, the background protection system sends protection action commands, waits for the protection device to be triggered, and then implements protection.

[0048] For the newly installed dual-electrode triggered grounding gap, the circuit impedance has been calculated to ensure that the metal wire explodes and releases charged particles simultaneously, enabling synchronous triggering. Power protection systems require a reference time based on GPS satellite signals to facilitate the stable execution of different equipment timings. The background control relay protection system sends protection action commands to the grounding trigger gap, waiting for the protection device to be triggered, thereby achieving protection.

[0049] Furthermore, it also includes: using the voltage in the first trigger gap capacitor as a reference voltage, and controlling the voltage of the capacitor in the second trigger gap by adjusting the PWM duty cycle, so that the voltage values ​​stored in the capacitors of the first and second trigger gaps are the same.

[0050] Furthermore, to ensure that the voltage stored in capacitors during the first trigger gap A and the second trigger gap B is at its highest and the same, the voltage in capacitor A during the first trigger gap is used as a reference voltage to adjust the PWM duty cycle, thereby controlling the voltage across capacitor C2 during the second trigger gap B. The circuit schematic is shown below. Figure 4 As shown. Figure 4 The switching frequency of the oscillator and the slope of the sawtooth wave output signal are fixed. The voltages of supercapacitors C1 and C1 are divided by an RC divider to obtain the first voltage Vref and the second voltage VBF, respectively. Vref and VBF are passed to the error amplifier EA, and EA outputs the analog signal Vc. When the voltage VBF increases, the analog signal Vc decreases, and vice versa (when the voltage VBF decreases, the analog signal Vc increases). The oscillator clk outputs a high level, and the RS flip-flop Q1 is set high, which is equivalent to generating a wave on the rising edge of the clock. If the voltage at C2 increases, the feedback voltage VFB increases, the error amplifier output Vc decreases, the comparator CP flips faster, CP takes longer to flip, the conduction time of Q1 is shortened, the PWM duty cycle decreases, and the voltage at C2 drops. If the voltage at C2 drops, the feedback voltage VFB decreases, the error amplifier output Vc increases, the comparator CP flips faster, CP takes longer to flip, the conduction time of Q1 is extended, the PWM duty cycle increases, and the voltage at C2 recovers.

[0051] Furthermore, the trigger gap is normally in standby mode. Over time, the impedance of the trigger circuit changes, causing a deviation in the peak arrival time after triggering. This peak time deviation is particularly severe for dual-electrode trigger gaps. However, direct impedance monitoring requires multi-parameter monitoring, which is difficult to implement. Therefore, this invention modifies the trigger logic. During normal operation, a multi-frequency voltage is applied to the trigger chamber. A Hall current sensor monitors the current, extracts the characteristic signal of current change over time, calculates the impedance value, and then uses a spline interpolation function to calculate the current-voltage-time curve. Based on the calculated values, the trigger times of the first trigger gap A and the second trigger gap B are adjusted respectively, enabling the simultaneous release of charged particles from the exploding metal wire.

[0052] Example 2 Based on the same inventive concept, this invention also provides a monitoring and control system for synchronous metal wire explosion based on dual electrodes, including: a normal time difference acquisition module, a time difference table acquisition module, a target time difference acquisition module, and a trigger time adjustment module; The normal time difference acquisition module is used to acquire the time difference between the detection of the current peak value in the first trigger gap and the second trigger gap under the normal operating condition of the target converter transformer, and use it as the current time difference; The time difference table acquisition module is used to periodically acquire the current time difference and store it to obtain a time difference table; The target time difference acquisition module is used to select the nearest current time difference as the target time difference based on the time difference table when the target converter transformer fails. The trigger time adjustment module is used to adjust the signal trigger time of the first trigger gap or the second trigger gap based on the target time difference, so as to achieve synchronous arrival of the current peak of the two trigger gaps.

[0053] Furthermore, in this embodiment, the functional implementation methods of each functional module correspond one-to-one with the methods described above, and will not be repeated here.

[0054] Example 3 Based on the same inventive concept, the present invention also provides an electronic device, which includes a processor and a memory, wherein the memory stores instructions, characterized in that the instructions are loaded and executed by the processor to implement a monitoring and control method for synchronous metal wire explosion based on dual electrodes as described in Embodiment 1.

[0055] Based on the same inventive concept, the present invention also provides a computer device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; When the processor executes the program stored in the memory, it can implement a monitoring and control method for synchronous metal wire explosion based on dual electrodes, as shown in Example 1.

[0056] The electronic device may include a processor, a communications interface, a memory, and a communication bus, wherein the processor, communications interface, and memory communicate with each other via the communication bus. The processor can call logical instructions in the memory to execute the monitoring and control method for synchronous metal wire explosion based on dual electrodes, as described in Embodiment 1.

[0057] Furthermore, the logical instructions in the aforementioned memory can be implemented as software functional units and sold or used as independent products, and can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0059] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A monitoring and control method for synchronous metal filament explosion based on dual electrodes, characterized in that, include: The time difference between the detection of the current peak value in the first trigger gap and the second trigger gap under normal operating conditions of the target converter transformer is obtained as the current time difference; The current time difference is periodically acquired and stored to obtain a time difference table; When the target converter transformer fails, the nearest current time difference is selected as the target time difference based on the time difference table; Based on the target time difference, adjust the signal triggering time of the first trigger gap or the second trigger gap to achieve synchronous arrival of the current peak of the two trigger gaps.

2. The monitoring and control method for synchronous metal filament explosion based on dual electrodes as described in claim 1, characterized in that, The method for obtaining the current time difference is as follows: Under the normal operating condition of the target converter transformer, the highest voltage of the first trigger gap and the second trigger gap is obtained; Based on different proportional values ​​of the highest voltage, the target voltage at the same frequency is used; Based on the target voltage at the same frequency, the time difference between the detection of the current peak value in the first trigger gap and the second trigger gap is obtained; The absolute value of the time difference is used as the current time difference.

3. The monitoring and control method for synchronous metal filament explosion based on dual electrodes as described in claim 2, characterized in that, The time difference of the current peak value is obtained as follows: The curve of the current value changing with time under different target voltages at the same frequency during the first trigger gap is obtained as the first curve. The peak value of the first curve is used as the first current peak value; The time corresponding to the first current peak value is used as the first peak time; Obtain the curve of the current value changing with time under different target voltages at the same frequency for the second trigger gap, and use it as the second curve; The peak value of the second curve is used as the second current peak value; The second peak time is taken as the time corresponding to the second current peak. The time difference of the current peak is based on the difference between the first peak time and the second peak time.

4. The monitoring and control method for synchronous metal filament explosion based on dual electrodes as described in claim 3, characterized in that, The first trigger gap includes a first rectifier charging circuit, a first control protection circuit, and a first metal wire explosion trigger cavity connected in sequence; A first current sensor is provided between the first control protection circuit and the first metal wire explosion triggering cavity to detect the change of current flowing through the first triggering gap over time. The second trigger gap includes a first rectifier charging circuit, a second control and protection circuit, and a second metal wire explosion trigger cavity connected in sequence; A second current sensor is provided between the second control and protection circuit and the second metal wire explosion triggering chamber to detect the change of current flowing through the second triggering gap over time.

5. The monitoring and control method for synchronous metal filament explosion based on dual electrodes as described in claim 4, characterized in that, The method for obtaining the time difference table is as follows: The current time difference is reacquired every preset time interval, and the corresponding acquisition time is recorded. Based on the acquisition time, the corresponding current time difference is stored in order from farthest to nearest to obtain the time difference table.

6. The monitoring and control method for synchronous metal filament explosion based on dual electrodes as described in claim 5, characterized in that, Also includes: Based on the time difference table, plot the curve of the current time difference as a function of the acquisition time; Based on the change curve, determine whether the current time difference exceeds the fault threshold; If so, it indicates that the impedance change of the trigger circuit is abnormal. The current time difference exceeding the fault threshold is marked as an abnormal time difference, and an impedance abnormality signal is generated and sent to relevant personnel for processing until normal is restored. Otherwise, it indicates that the impedance change of the trigger circuit is normal, and monitoring should continue.

7. The monitoring and control method for synchronous metal filament explosion based on dual electrodes as described in claim 6, characterized in that, The method for obtaining the target time difference is as follows: When the target converter transformer fails, determine whether the abnormal time difference exists based on the time difference table; If so, the target time difference is the most recent current time difference preceding the abnormal time difference; Otherwise, the most recently acquired current time difference is selected as the target time difference based on the acquisition time.

8. The monitoring and control method for synchronous metal filament explosion based on dual electrodes as described in claim 7, characterized in that, The signal trigger time adjustment method is as follows: Based on the time difference table, the first peak time and the second peak time corresponding to the first trigger gap and the second trigger gap are obtained; Based on the comparison between the first peak time and the second peak time, the trigger gap corresponding to the larger peak time is taken as the delayed trigger gap, and the trigger gap corresponding to the smaller peak time is taken as the normal trigger gap. The signal triggering time based on the normal triggering gap is used as the reference time; Based on the reference time, the target time difference is triggered in advance, which serves as the signal trigger time of the hysteresis trigger, so that the current peaks of the first trigger gap and the second trigger gap can arrive synchronously.

9. The monitoring and control method for synchronous metal wire explosion based on dual electrodes as described in claim 8, characterized in that, Also includes: The voltage in the first trigger gap capacitor is used as a reference voltage, and the voltage in the capacitor on the second trigger gap is controlled by adjusting the PWM duty cycle, so that the voltage values ​​stored in the capacitors of the first and second trigger gaps are the same.

10. A monitoring and control system for synchronous metal wire explosion based on dual electrodes, used to execute the monitoring and control method for synchronous metal wire explosion based on dual electrodes as described in any one of claims 1-9, characterized in that, include: The module includes a normal time difference acquisition module, a time difference table acquisition module, a target time difference acquisition module, and a trigger time adjustment module. The normal time difference acquisition module is used to acquire the time difference between the detection of the current peak value in the first trigger gap and the second trigger gap under the normal operating state of the target converter transformer, and use it as the current time difference. The time difference table acquisition module is used to periodically acquire the current time difference and store it to obtain a time difference table; The target time difference acquisition module is used to select the nearest current time difference as the target time difference based on the time difference table when the target converter transformer fails. The trigger time adjustment module is used to adjust the signal trigger time of the first trigger gap or the second trigger gap based on the target time difference, so as to realize the synchronous arrival of the current peak of the two trigger gaps.

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