Device testing and maintenance methods and systems for ultra-high speed circuit breaker fast breaking devices

Abstract

This invention provides a method and system for testing and maintaining a fast-breaking device of an ultra-high-speed circuit breaker, relating to the field of circuit breaker technology. The method includes: sending an experimental testing command to an AC power supply simulation device; receiving in real time the energy storage branch current fed back by a first current transformer, the main branch current fed back by a second current transformer, and the energy storage capacitor voltage across the zero-crossing energy storage capacitor fed back by a voltage transformer; calculating and generating the energy storage capacitor capacity based on multiple energy storage branch currents and multiple energy storage capacitor voltages; and calculating and generating the estimated service life of the zero-crossing energy storage capacitor based on the energy storage capacitor capacity and a preset aging capacitor capacity threshold. In this application, a fault model signal is first sent to the ultra-high-speed circuit breaker fast-breaking device through the AC power supply simulation device to cause the ultra-high-speed circuit breaker fast-breaking device to operate, thereby facilitating the inspection and maintenance of the ultra-high-speed circuit breaker fast-breaking device.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more specifically, to a device testing and maintenance method and system based on a fast-breaking device for ultra-high-speed circuit breakers. Background Technology

[0002] With the continuous development of the economy and the rapid growth of enterprise electricity load, when a fault occurs in the power grid supply circuit, it will cause great harm to electrical equipment and even the entire power grid. Quickly clearing the fault and reducing its impact on the power supply system is the goal we strive to achieve.

[0003] like Figure 1 As shown in the related technology, there is an ultra-high speed circuit breaker breaking device, which includes an ultra-high speed circuit breaker and an artificial zero-crossing branch connected in parallel to the ultra-high speed circuit breaker. The artificial zero-crossing branch includes a zero-crossing energy storage capacitor, a first vacuum trigger switch and a modulation inductor connected in series. A zinc oxide resistor is also connected in parallel on the zero-crossing energy storage unit composed of the zero-crossing energy storage capacitor and the first vacuum trigger switch.

[0004] Meanwhile, a first current transformer is installed between the zero-crossing energy storage capacitor and the first vacuum trigger switch, and a second current transformer is installed on the branch where the ultra-high-speed circuit breaker is located. A voltage transformer is also installed across the zero-crossing energy storage capacitor. When a short-circuit fault is detected in the system, the first vacuum trigger switch is closed. Under the combined action of the zero-crossing energy storage capacitor and the modulation inductor, a reverse current is superimposed on the ultra-high-speed circuit breaker, thereby creating an artificial zero-crossing point on the ultra-high-speed circuit breaker.

[0005] However, during the long-term use of ultra-high speed circuit breaker breaking devices, or during the production and testing of ultra-high speed circuit breaker breaking devices, there may be aging of the devices or production differences, so testing and maintenance management are required. Summary of the Invention

[0006] To facilitate the inspection and maintenance management of ultra-high speed circuit breaker breaking devices, this application provides a device inspection and maintenance method and system based on ultra-high speed circuit breaker fast breaking devices.

[0007] In the first aspect, this application provides a device detection and maintenance method based on a fast-breaking device of an ultra-high-speed circuit breaker, which adopts the following technical solution:

[0008] A device inspection and maintenance method based on a fast-breaking device of an ultra-high-speed circuit breaker, the method comprising:

[0009] Send experimental testing commands to the AC power supply simulation equipment;

[0010] The system receives in real time the energy storage branch current fed back by the first current transformer, the main branch current fed back by the second current transformer, and the energy storage capacitor voltage across the zero-crossing energy storage capacitor fed back by the voltage transformer.

[0011] The energy storage capacitor capacity is calculated and generated based on the currents of the multiple energy storage branches and the voltages of the multiple energy storage capacitors.

[0012] Based on the energy storage capacitor capacity and the preset aging capacitor capacity threshold, the estimated service life of the zero-crossing energy storage capacitor is calculated.

[0013] Optionally, calculating and generating the energy storage capacitor capacity based on the multiple energy storage branch currents and the multiple energy storage capacitor voltages includes:

[0014] Among the multiple energy storage capacitor voltages, the initial energy storage voltage and discharge termination voltage of the zero-crossing energy storage capacitor are captured, and the energy storage voltage difference is calculated and generated.

[0015] The energy storage capacitor capacity is calculated based on the currents of multiple energy storage branches, the times corresponding to the currents of multiple energy storage branches, and the energy storage voltage difference.

[0016] Optionally, a reference energy storage unit is connected in parallel to the zero-crossing energy storage unit, wherein the reference energy storage unit includes a reference energy storage capacitor bank connected in series and a second vacuum trigger switch.

[0017] After sending the experimental test command to the AC power simulation device, the method further includes:

[0018] Obtain the frequency of the test current change as the modulation inductor moves away from the end of the first vacuum trigger switch;

[0019] After calculating and generating the energy storage capacitor capacity based on the multiple energy storage branch currents and multiple energy storage capacitor voltages, the method further includes:

[0020] Adjust the reference capacitor capacity of the reference energy storage capacitor group according to the energy storage capacitor capacity;

[0021] Send a comparison test command to the AC power supply simulation device, and send a closing command to the second vacuum trigger switch after detecting a fault current;

[0022] The frequency of the reference current change at the end of the modulation inductor furthest from the second vacuum trigger switch is obtained, and a capacitance estimation error value is generated based on the frequency of the reference current change and the frequency of the test current change.

[0023] The energy storage capacitor capacity is updated based on the reference capacitor capacity and the estimated error value of the capacitance value.

[0024] Optionally, generating the capacitance estimation error value based on the frequency of change of the control current and the frequency of change of the test current includes:

[0025] The first estimated capacity is calculated and generated based on the frequency of the test current change and the inductive reactance value of the pre-stored modulation inductor.

[0026] A second estimated capacity is calculated based on the frequency of the change in the reference current and the inductive reactance of the modulation inductor.

[0027] The capacity estimation error value is calculated based on the difference between the second estimated capacity and the first estimated capacity.

[0028] Optionally, updating the energy storage capacitor capacity based on the reference capacitor capacity and the capacitance value estimation error value includes:

[0029] If the capacitance estimation error value is greater than the preset capacitance calculation error threshold, then a reference adjustment capacitance value is calculated and generated based on the capacitance estimation error value and the reference capacitance value, and the energy storage capacitance value is updated based on the reference adjustment capacitance value.

[0030] If the capacitance estimation error is less than or equal to the capacitance calculation error threshold, then the energy storage capacitor capacity is updated based on the reference capacitor capacity.

[0031] Optionally, the step of calculating the estimated lifespan of the zero-crossing energy storage capacitor based on the energy storage capacitor capacity and a preset aging capacitor capacity threshold includes:

[0032] Obtain the current ambient temperature of the fast-breaking device of the ultra-high-speed circuit breaker;

[0033] Based on preset ambient temperature influence data and the current ambient temperature, a current temperature influence coefficient is generated. The ambient temperature influence data includes multiple temperature influence coefficients and multiple corresponding temperature values.

[0034] The current differential exclusion capacitor capacity is calculated and generated based on the energy storage capacitor capacity and the current temperature influence coefficient.

[0035] The estimated service life is calculated based on the pre-stored capacitor aging curve data, the aging capacitor capacity threshold, and the current differential exclusion capacitor capacity.

[0036] Optionally, the step of calculating and generating the estimated service life based on the pre-stored capacitor aging curve data, the aging capacitor capacity threshold, and the current differentially excluded capacitor capacity includes:

[0037] Obtain historical ambient temperature information of the working environment of the ultra-high speed circuit breaker fast breaking device, and filter out the historical peak ambient temperature from the historical ambient temperature information;

[0038] Based on the historical peak ambient temperature and the ambient temperature influence data, a peak temperature influence coefficient is generated;

[0039] Based on the peak temperature influence coefficient and the aging capacitor capacitance threshold, the peak differential exclusion capacitor capacity is calculated and generated.

[0040] Based on the current differential exclusion capacitor capacity, the peak differential exclusion capacitor capacity, and the capacitor aging curve data, an estimated service life is generated.

[0041] Secondly, this application provides a device detection and maintenance system based on a fast-breaking device for ultra-high-speed circuit breakers, employing the following technical solution:

[0042] A device detection and maintenance system based on a fast-breaking device of an ultra-high-speed circuit breaker, the system comprising an AC power supply simulation device and a detection and maintenance processing terminal, the detection and maintenance processing terminal comprising:

[0043] The control command sending module is used to send experimental test commands to the AC power supply simulation equipment;

[0044] The information receiving module is used to receive in real time the energy storage branch current fed back by the first current transformer, the main branch current fed back by the second current transformer, and the energy storage capacitor voltage across the zero-crossing energy storage capacitor fed back by the voltage transformer.

[0045] The capacitance value calculation and processing module is used to calculate and generate the energy storage capacitor capacity based on the current of multiple energy storage branches and the voltage of multiple energy storage capacitors.

[0046] The capacitor life estimation module is used to calculate and generate the estimated lifespan of the zero-crossing energy storage capacitor based on the capacity of the energy storage capacitor and a preset aging capacitor capacity threshold.

[0047] Thirdly, this application provides a detection and maintenance processing terminal, which adopts the following technical solution:

[0048] A detection and maintenance processing terminal includes a processor and a memory. The memory stores at least one instruction, at least one program, a code set, or an instruction set. The at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the device detection and maintenance method based on the ultra-high-speed circuit breaker fast-breaking device as described in the first aspect.

[0049] Fourthly, this application provides a computer-readable storage medium, which adopts the following technical solution:

[0050] A computer-readable storage medium storing at least one instruction, at least one program, a code set, or an instruction set, wherein the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by a processor to implement the device detection and maintenance method based on the fast-breaking device of an ultra-high-speed circuit breaker as described in the first aspect.

[0051] In summary, this application includes at least one of the following beneficial technical effects:

[0052] In this application, a fault model signal is first sent to the ultra-high speed circuit breaker fast breaking device through an AC power simulation device, so that the ultra-high speed circuit breaker fast breaking device can be activated, thereby facilitating the inspection and maintenance of the ultra-high speed circuit breaker fast breaking device.

[0053] By analyzing the discharge process of the zero-crossing energy storage capacitor during the operation of the fast-breaking device of the ultra-high-speed circuit breaker, the estimated service life of the zero-crossing energy storage capacitor can be calculated, thereby reducing the possibility of abnormal operation of the fast-breaking device of the ultra-high-speed circuit breaker.

[0054] In this application, the capacity of the energy storage capacitor is first calculated by calculating the discharge current of the zero-crossing energy storage capacitor and the voltage difference before and after discharge. Then, by setting up a control energy storage capacitor group, the capacitance estimation error between the zero-crossing energy storage capacitor and the control energy storage capacitor group is reduced, thereby reducing the measurement and calculation errors that may be caused by data acquisition and device aging. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a circuit diagram of an ultra-high-speed circuit breaker breaking device in related technologies.

[0057] Figure 2 This is a circuit diagram of an ultra-high-speed circuit breaker fast breaking device and an AC power supply simulation device provided in an embodiment of this application.

[0058] Figure 3 This is a flowchart illustrating a device testing and maintenance method based on a fast-breaking device for ultra-high-speed circuit breakers, provided in an embodiment of this application.

[0059] Figure 4 This is a schematic diagram of a process for updating the capacity of an energy storage capacitor provided in an embodiment of this application.

[0060] Figure 5This is a schematic diagram of a process for calculating the estimated lifespan of a zero-crossing energy storage capacitor, provided in an embodiment of this application. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of this invention clearer, the following will be described in conjunction with the appendix. Figure 2-5 The embodiments of the present invention will be described in further detail below.

[0062] This application provides a fast-breaking device for ultra-high-speed circuit breakers, such as... Figure 2 As shown, it includes an ultra-high-speed circuit breaker and an artificial zero-crossing branch connected in parallel to the ultra-high-speed circuit breaker.

[0063] The artificial zero-crossing branch includes a zero-crossing energy storage capacitor, a first vacuum trigger switch, and a modulation inductor connected in series, wherein the zero-crossing energy storage capacitor and the first vacuum trigger switch connected in series constitute a zero-crossing energy storage unit.

[0064] A zinc oxide resistor is connected in parallel to the zero-crossing energy storage unit, and a control energy storage unit is also connected in parallel to the zero-crossing energy storage unit. The control energy storage unit includes a control energy storage capacitor bank connected in series and a second vacuum trigger switch.

[0065] In addition, a first current transformer is installed between the zero-crossing energy storage capacitor and the first vacuum trigger switch, a third current transformer is installed between the reference energy storage capacitor group and the second vacuum trigger switch, a second current transformer is installed on the branch where the ultra-high speed circuit breaker is located, and a voltage transformer is also installed across the zero-crossing energy storage capacitor.

[0066] This application also provides a device testing and maintenance method based on an ultra-high-speed circuit breaker fast-breaking device. This method can be applied to a device testing and maintenance system based on an ultra-high-speed circuit breaker fast-breaking device. The device testing and maintenance system based on the ultra-high-speed circuit breaker fast-breaking device can consist of an AC power supply simulation device, a testing and maintenance processing terminal, and an ultra-high-speed breaking device. The circuit diagrams of the ultra-high-speed circuit breaker fast-breaking device and the AC power supply simulation device are shown below. Figure 2 As shown.

[0067] The output terminal of the AC power supply simulation device is connected to the ultra-high speed circuit breaker. One control terminal of the detection and maintenance processing terminal is electrically connected to the control terminal of the AC power supply simulation device. Multiple input terminals of the detection and maintenance processing terminal are also electrically connected to the output terminals of the first current transformer, the second current transformer, the third current transformer, and the voltage transformer, respectively. Furthermore, one input terminal of the detection and maintenance processing terminal is also electrically connected to the modulation inductor away from the first vacuum trigger switch.

[0068] The main body for implementing this method can be the detection and maintenance processing terminal in the device detection and maintenance system based on the ultra-high speed circuit breaker fast breaking device, and it can be assisted by AC power simulation equipment.

[0069] The following will describe the specific implementation methods. Figure 3 The processing flow shown is explained in detail below:

[0070] Step S101: Send an experimental test command to the AC power supply simulation device.

[0071] During implementation, the testing and maintenance terminal sends experimental testing commands to the AC power simulation equipment, which is an AC generator. The AC power simulation equipment supplies AC power to the ultra-high speed circuit breaker's fast breaking device by first supplying stable AC power and then simulating a single-phase ground fault current.

[0072] Step S102: Receive in real time the energy storage branch current fed back by the first current transformer, the main branch current fed back by the second current transformer, and the energy storage capacitor voltage across the zero-crossing energy storage capacitor fed back by the voltage transformer.

[0073] During implementation, after the testing and maintenance terminal sends the test command to the AC power supply simulation equipment, it receives real-time data feedback from the first current transformer, the second current transformer, and the voltage transformer.

[0074] Among them, the current value fed back by the first current transformer can be called the energy storage branch current, the current value fed back by the second current transformer can be called the main branch current, and the voltage value fed back by the voltage transformer chain can be called the energy storage capacitor voltage.

[0075] Step S103: Calculate the generated energy storage capacitor capacity based on the current of multiple energy storage branches and the voltage of multiple energy storage capacitors.

[0076] During implementation, the detection and maintenance terminal calculates the energy storage capacitor capacity by monitoring the current of multiple energy storage branches and the voltage of the energy storage capacitor in real time.

[0077] Specifically, the steps for calculating the energy storage capacitor capacity are as follows:

[0078] Among multiple energy storage capacitor voltages, the initial energy storage voltage and discharge termination voltage of the zero-crossing energy storage capacitor are captured, and the energy storage voltage difference is calculated.

[0079] In practice, the detection and maintenance processing terminal captures the initial energy storage voltage of the zero-crossing energy storage capacitor during the initial stage of discharge, and the discharge termination voltage of the zero-crossing energy storage capacitor after the discharge ends. Furthermore, the detection and maintenance processing terminal subtracts the initial energy storage voltage from the discharge termination voltage to calculate the energy storage voltage difference.

[0080] In this application, after the detection and maintenance processing terminal sends an experimental detection command to the AC power supply simulation equipment, and detects the fault current through the main branch current fed back by the second current transformer, it controls the first vacuum trigger switch to close. At this time, the zero-crossing energy storage capacitor begins to discharge. Then, under the combined action of the zero-crossing energy storage capacitor and the modulation inductor, a high-frequency resonant current is forcibly superimposed on the ultra-high-speed circuit breaker, artificially creating a zero-crossing point and forcing the arc-extinguishing chamber current of the ultra-high-speed circuit breaker to cross zero and extinguish the arc. After the ultra-high-speed circuit breaker opens at the artificially created zero-crossing point, the first vacuum trigger switch is controlled to open, and the discharge of the zero-crossing energy storage capacitor ends.

[0081] It should be noted that since the initial energy storage voltage and the discharge termination voltage may have different voltage and current directions before and after discharge, it is convenient to calculate by carrying positive and negative values. At the same time, the absolute value of the calculated energy storage capacity is taken as the calculation result.

[0082] The energy storage capacitor capacity is calculated based on the currents of multiple energy storage branches, the times corresponding to the currents of multiple energy storage branches, and the energy storage voltage difference.

[0083] In implementation, the detection and maintenance terminal first calculates the discharge charge of the zero-crossing energy storage capacitor based on the currents of multiple energy storage branches and the discharge duration of the zero-crossing energy storage capacitor. The specific formula is as follows:

[0084] ;

[0085] in, This represents the amount of charge discharged from the capacitor. and These represent the start and end times of discharge for the zero-crossing energy storage capacitor, respectively. This refers to the capacitor energy dissipation current flowing through the capacitor energy dissipation branch.

[0086] Next, the inspection and maintenance terminal calculates the energy storage capacitor capacity using the discharge charge of the zero-crossing energy storage capacitor and the energy storage voltage difference. The specific formula is as follows:

[0087] ;

[0088] in, For energy storage capacitor capacity, This represents the voltage change value.

[0089] Step S104: Calculate the estimated lifespan of the zero-crossing energy storage capacitor based on the energy storage capacitor capacity and the preset aging capacitor capacity threshold.

[0090] During implementation, the testing and maintenance terminal also pre-stores capacitor aging curve data. This data reflects the relationship between the usage time and capacitance of capacitors of the same model as zero-crossing energy storage capacitors.

[0091] The detection and maintenance terminal uses preset aging capacitor capacity thresholds and energy storage capacitor capacity to match the corresponding usage time in the capacitor aging curve data. Then, it uses the difference between the two matched usage times to calculate and generate the estimated service life of the zero-crossing energy storage capacitor.

[0092] In this application, a fault model signal is first sent to the ultra-high-speed circuit breaker fast-breaking device via an AC power simulation device, causing the device to operate, thereby facilitating its inspection and maintenance. Furthermore, by analyzing the discharge process of the zero-crossing energy storage capacitor during the operation of the ultra-high-speed circuit breaker fast-breaking device, the estimated service life of the zero-crossing energy storage capacitor is calculated, thereby reducing the possibility of abnormal operation of the ultra-high-speed circuit breaker fast-breaking device.

[0093] Optionally, after step S101, there may be further steps such as... Figure 4 The processing steps shown are as follows:

[0094] Step S201: Obtain the frequency of the test current change when the modulation inductor is far from the end of the first vacuum trigger switch.

[0095] In practice, the detection and maintenance processing terminal acquires the current change frequency of the modulation inductor away from the end of the first vacuum trigger switch. The current change frequency acquired here is the current change frequency acquired when the first vacuum trigger switch is in the closing stage after the detection and maintenance processing terminal sends the experimental detection command to the AC power supply simulation equipment. The current change frequency acquired here is called the test current change frequency.

[0096] In addition, after step S103, there are also... Figure 4 The processing steps shown are as follows:

[0097] Step S202: Adjust the reference capacitor capacity of the reference energy storage capacitor group according to the energy storage capacitor capacity.

[0098] During implementation, the testing and maintenance terminal adjusts the capacity of the control capacitor group by adjusting the capacity of the energy storage capacitor group, so that a control experiment can be conducted again using the control capacitor group.

[0099] Step S203: Send a comparison test command to the AC power supply simulation device, and send a closing command to the second vacuum trigger switch after detecting the fault current.

[0100] During implementation, the testing and maintenance terminal sends a comparison test command to the AC analog equipment. Upon receiving the comparison test command, the AC analog equipment treats the comparison energy storage unit as a zero-crossing energy storage unit, causing the comparison energy storage unit to undergo a discharge process.

[0101] Specifically, after the detection and maintenance terminal sends a comparison detection command to the AC power supply simulation equipment, and detects the fault current through the main branch current fed back by the second current transformer, it controls the second vacuum trigger switch to close, at which point the comparison energy storage capacitor bank begins to discharge. Then, under the combined action of the comparison energy storage capacitor bank and the modulation inductor, a high-frequency resonant current is forcibly superimposed on the ultra-high-speed circuit breaker, artificially creating a zero-crossing point and forcing the arc-extinguishing chamber current of the ultra-high-speed circuit breaker to cross zero and extinguish the arc. After the ultra-high-speed circuit breaker trips at the artificially created zero-crossing point, the second vacuum trigger switch is controlled to trip, and the discharge of the comparison energy storage capacitor bank ends.

[0102] In addition, the detection and maintenance processing terminal receives the current value fed back by the first current transformer in real time, and the fed-back current value is referred to as the reference main current.

[0103] Step S204: Obtain the reference current change frequency at the end of the modulation inductor away from the second vacuum trigger switch, and generate a capacitance estimation error value based on the reference current change frequency and the test current change frequency.

[0104] In practice, the detection and maintenance processing terminal acquires the current change frequency at the end of the modulation inductor that is far from the second vacuum trigger switch. The current change frequency acquired here is the current change frequency acquired when the second vacuum trigger switch is in the closing stage after the detection and maintenance processing terminal sends a comparison detection command to the AC power supply simulation equipment. The current change frequency acquired here is called the comparison current change frequency.

[0105] Furthermore, the detection and maintenance processing terminal calculates the capacitance estimation error between the reference energy storage capacitor bank and the zero-crossing energy storage capacitor by comparing the frequency of change of the reference current and the frequency of change of the test current.

[0106] Specifically, the processing steps for calculating and generating the capacitance estimation error value are as follows:

[0107] The first estimated capacity is calculated and generated based on the frequency of the test current change and the inductive reactance value of the pre-stored modulation inductor.

[0108] The second estimated capacity is calculated based on the frequency of the reference current change and the inductive reactance of the modulation inductor.

[0109] The capacity estimation error value is calculated based on the difference between the second estimated capacity and the first estimated capacity.

[0110] During implementation, the inductive reactance value of the modulation inductor is pre-stored in the detection and maintenance processing terminal.

[0111] The detection and maintenance processing terminal calculates and generates the first estimated capacity value using the following formula:

[0112] ;

[0113] in, To test the frequency of the current change, This is the first estimated capacity value. This is the inductive reactance value of the modulation inductor.

[0114] The detection and maintenance processing terminal calculates and generates a second estimated capacity value using the following formula:

[0115] ;

[0116] in, To compare the frequency of the current change, This is the second estimated capacity value.

[0117] Then, the detection and maintenance processing terminal generates a capacity estimation error value based on the difference between the second estimated capacity and the first estimated capacity.

[0118] Step S205: Update the energy storage capacitor capacity based on the error value estimated by comparing the capacitor capacity and capacitance value.

[0119] In practice, the testing and maintenance terminal updates the energy storage capacitor capacity by summing the error values ​​estimated from the comparison of the capacitor capacity and capacitance value.

[0120] Specifically, the steps for updating the energy storage capacitor capacity are as follows:

[0121] If the capacitance estimation error is greater than the preset capacitance calculation error threshold, the reference adjustment capacitance is calculated and generated based on the capacitance estimation error and the reference capacitance, and the energy storage capacitance is updated based on the reference adjustment capacitance.

[0122] If the capacitance estimation error is less than or equal to the capacitance calculation error threshold, the energy storage capacitor capacity is updated based on the reference capacitor capacity.

[0123] In practice, the detection and maintenance processing terminal compares the capacitance estimation error value with the capacitance calculation error threshold. The comparison results can be one of the following three:

[0124] Scenario 1: If the capacitance estimation error is greater than the capacitance calculation error threshold and the first estimated capacity is greater than the second estimated capacity, the detection and maintenance processing terminal will add the capacitance estimation error and the reference capacitor capacity to calculate and generate the reference adjustment capacitor capacity, and then update the energy storage capacitor capacity with the calculated reference adjustment capacitor capacity.

[0125] Scenario 1: If the capacitance estimation error is greater than the capacitance calculation error threshold and the first estimated capacity is less than the second estimated capacity, the detection and maintenance processing terminal will subtract the capacitance estimation error from the reference capacitor capacity to calculate the reference adjustment capacitor capacity, and then update the energy storage capacitor capacity with the calculated reference adjustment capacitor capacity.

[0126] Scenario 2: If the capacitance estimation error is less than or equal to the capacitance calculation error threshold, then the energy storage capacitor capacity is updated based on the reference capacitor capacity.

[0127] In this application, the capacity of the energy storage capacitor is first calculated by calculating the discharge current of the zero-crossing energy storage capacitor and the voltage difference before and after discharge. Then, by setting up a control energy storage capacitor group, the capacitance estimation error between the zero-crossing energy storage capacitor and the control energy storage capacitor group is reduced, thereby reducing the measurement and calculation errors that may be caused by data acquisition and device aging.

[0128] Optionally, in step S104, there may also be such Figure 5 The specific operation process shown is as follows:

[0129] Step S301: Obtain the current ambient temperature of the ultra-high speed circuit breaker's fast disconnection device.

[0130] During implementation, the detection and maintenance terminal can obtain the current ambient temperature of the ultra-high speed circuit breaker's fast disconnection device through a temperature sensor.

[0131] Step S302: Generate the current temperature influence coefficient based on the preset ambient temperature influence data and the current ambient temperature. The ambient temperature influence data includes multiple temperature influence coefficients and multiple corresponding temperature values.

[0132] In implementation, the detection and maintenance terminal is pre-loaded with ambient temperature influence data. This data includes multiple temperature influence coefficients and corresponding temperature values. This ambient temperature influence data can be obtained from experiments conducted in a laboratory. The temperature influence coefficients reflect the proportional change in capacitance of the zero-crossing energy storage capacitor due to environmental changes. It should be noted that, for ease of understanding, a standard ambient temperature temperature influence coefficient of 1 can be established.

[0133] The detection and maintenance terminal matches the current ambient temperature with the corresponding temperature influence coefficient in the ambient temperature influence data. The temperature influence coefficient matched here is called the current temperature influence coefficient.

[0134] Step S303: Calculate and generate the current differential exclusion capacitor capacity based on the energy storage capacitor capacity and the current temperature influence coefficient.

[0135] In practice, the detection and maintenance terminal will multiply the updated energy storage capacitor capacity by the current temperature influence coefficient to calculate and generate the current differential exclusion capacitor capacity.

[0136] Step S304: Calculate and generate the estimated service life based on the pre-stored capacitor aging curve data, the aging capacitor capacity threshold, and the current differential exclusion capacitor capacity.

[0137] In practice, the detection and maintenance processing terminal pre-stores capacitor aging curve data, which is used to reflect the relationship between capacitance value and usage time during the aging process of zero-crossing energy storage capacitors.

[0138] The detection and maintenance processing terminal uses the aging capacitor capacity threshold and the current differential excluded capacitor capacity to match two usage durations in the capacitor aging curve data. Then, it calculates and generates the estimated service life based on the difference between the two usage durations.

[0139] The detection and maintenance terminal eliminates the influence of temperature on the estimated service life by collecting the current ambient temperature.

[0140] Optionally, in step S304, the following processing method also exists, and the specific operation flow is as follows:

[0141] Obtain historical ambient temperature information of the working environment of the ultra-high speed circuit breaker's fast breaking device, and filter out the historical peak ambient temperature from the historical ambient temperature information.

[0142] During implementation, the detection and maintenance processing terminal obtains historical ambient temperature information of the working environment of the ultra-high speed circuit breaker's fast breaking device. This historical ambient temperature information can be multiple historical temperature values ​​from one year.

[0143] Next, the highest historical ambient temperature value is selected from the historical ambient temperature information of the monitoring and maintenance terminal, and this highest historical ambient temperature value is called the historical peak ambient temperature.

[0144] Based on historical peak ambient temperature and ambient temperature impact data, a peak temperature impact coefficient is generated.

[0145] In practice, the detection and maintenance processing terminal uses historical peak ambient temperature to match the corresponding temperature influence coefficient in the ambient temperature influence data, and the matched temperature influence coefficient here is called the peak temperature influence coefficient.

[0146] Based on the peak temperature influence coefficient and the aging capacitor capacitance threshold, the peak differential exclusion capacitor capacity is calculated and generated.

[0147] In practice, the detection and maintenance terminal divides the aging capacitor capacitance value threshold by the quotient of the peak temperature influence coefficient to generate the peak difference exclusion capacitor capacitance value.

[0148] It is understandable that if the actual capacitance value of the zero-crossing energy storage capacitor reaches the capacitance value threshold of the aging capacitor under the historical peak ambient temperature, the capacitance value corresponding to the zero-crossing energy storage capacitor is placed at the standard ambient temperature again, which can be called the peak difference elimination capacitance value.

[0149] Based on the current differential exclusion capacitor capacity, peak differential exclusion capacitor capacity, and capacitor aging curve data, an estimated service life is generated.

[0150] In practice, the detection and maintenance processing terminal uses the current differential capacitor capacity and the peak differential capacitor capacity to match two usage durations in the capacitor aging curve data. Then, the difference between the two usage durations is used to calculate and generate the estimated service life, so as to further eliminate the error caused by the estimation of the estimated service life corresponding to the temperature.

[0151] This application also discloses a device detection and maintenance system based on an ultra-high-speed circuit breaker fast-breaking device. The system includes an AC power simulation device, a detection and maintenance processing terminal, and an ultra-high-speed breaking device. The detection and maintenance processing terminal includes:

[0152] The control command sending module is used to send experimental test commands to the AC power supply simulation equipment;

[0153] The information receiving module is used to receive in real time the energy storage branch current fed back by the first current transformer, the main branch current fed back by the second current transformer, and the energy storage capacitor voltage across the zero-crossing energy storage capacitor fed back by the voltage transformer.

[0154] The capacitor value calculation and processing module is used to calculate and generate the energy storage capacitor capacity based on the current of multiple energy storage branches and the voltage of multiple energy storage capacitors.

[0155] The capacitor life estimation module is used to calculate and generate the estimated lifespan of the zero-crossing energy storage capacitor based on the energy storage capacitor capacity and the preset aging capacitor capacity threshold.

[0156] Optional, a capacitance value calculation and processing module, specifically used for:

[0157] Among multiple energy storage capacitor voltages, the initial energy storage voltage and discharge termination voltage of the zero-crossing energy storage capacitor are captured, and the energy storage voltage difference is calculated.

[0158] The energy storage capacitor capacity is calculated based on the currents of multiple energy storage branches, the times corresponding to the currents of multiple energy storage branches, and the energy storage voltage difference.

[0159] Optionally, the detection and maintenance processing terminal may also include:

[0160] The capacitor value update module is used to obtain the frequency of the test current change when the modulation inductor is far away from the end of the first vacuum trigger switch;

[0161] Adjust the capacity of the reference energy storage capacitor group according to the capacity of the energy storage capacitor.

[0162] Send a comparison test command to the AC power supply simulation equipment, and send a closing command to the second vacuum trigger switch after detecting the fault current;

[0163] Obtain the reference current change frequency at the end of the modulation inductor far from the second vacuum trigger switch, and generate a capacitance estimation error value based on the reference current change frequency and the test current change frequency.

[0164] The energy storage capacitor capacity is updated based on the error value estimated from the reference capacitor capacity and capacitance value.

[0165] Optionally, the capacitance value calculation and processing module can also be used for:

[0166] The first estimated capacity is calculated and generated based on the frequency of the test current change and the inductive reactance value of the pre-stored modulation inductor.

[0167] The second estimated capacity is calculated based on the frequency of the reference current change and the inductive reactance of the modulation inductor.

[0168] The capacity estimation error value is calculated based on the difference between the second estimated capacity and the first estimated capacity.

[0169] Optionally, the capacitor value update module can also be used for:

[0170] If the capacitance estimation error is greater than the preset capacitance calculation error threshold, the reference adjustment capacitance is calculated and generated based on the capacitance estimation error and the reference capacitance, and the energy storage capacitance is updated based on the reference adjustment capacitance.

[0171] If the capacitance estimation error is less than or equal to the capacitance calculation error threshold, the energy storage capacitor capacity is updated based on the reference capacitor capacity.

[0172] Optional, a capacitance value calculation and processing module, specifically used for:

[0173] Obtain the current ambient temperature of the fast-breaking device of the ultra-high-speed circuit breaker;

[0174] Based on the preset ambient temperature influence data and the current ambient temperature, a current temperature influence coefficient is generated. The ambient temperature influence data includes multiple temperature influence coefficients and multiple corresponding temperature values.

[0175] The current differential exclusion capacitor capacity is calculated and generated based on the energy storage capacitor capacity and the current temperature influence coefficient.

[0176] Based on the pre-stored capacitor aging curve data, the aging capacitor capacity threshold, and the current differential exclusion capacitor capacity, the estimated service life is calculated and generated.

[0177] Optionally, the capacitance value calculation and processing module can also be used for:

[0178] Obtain historical ambient temperature information of the working environment of the ultra-high speed circuit breaker fast breaking device, and filter out the historical peak ambient temperature from the historical ambient temperature information.

[0179] Based on historical peak ambient temperature and ambient temperature impact data, a peak temperature impact coefficient is generated.

[0180] Based on the peak temperature influence coefficient and the aging capacitor capacitance threshold, the peak differential exclusion capacitor capacity is calculated and generated.

[0181] Based on the current differential exclusion capacitor capacity, peak differential exclusion capacitor capacity, and capacitor aging curve data, an estimated service life is generated.

[0182] This application provides a detection and maintenance processing terminal, which can vary significantly due to different configurations or performance. It may include one or more central processing units (e.g., one or more processors) and memory, and one or more storage media (e.g., one or more mass storage devices) for storing applications or data. The memory and storage media can be temporary or persistent storage. The program stored in the storage media may include one or more modules (not shown in the figures), and each module may include a series of instruction operations on the detection and maintenance processing terminal.

[0183] The testing and maintenance terminal may also include one or more power supplies, one or more wired or wireless network interfaces, one or more input / output interfaces, one or more keyboards, and / or one or more operating systems.

[0184] The detection and maintenance processing terminal may include a memory and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by one or more processors. One or more programs include processing of the detection and maintenance processing terminal in the above-mentioned device detection and maintenance method based on the ultra-high speed circuit breaker fast breaking device.

[0185] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory.

[0186] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

[0187] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A device testing and maintenance method based on a fast-breaking device of an ultra-high-speed circuit breaker, characterized in that, The method includes: Send experimental testing commands to the AC power supply simulation equipment; The system receives in real time the energy storage branch current fed back by the first current transformer, the main branch current fed back by the second current transformer, and the energy storage capacitor voltage across the zero-crossing energy storage capacitor fed back by the voltage transformer. The energy storage capacitor capacity is calculated and generated based on the currents of the multiple energy storage branches and the voltages of the multiple energy storage capacitors. Based on the energy storage capacitor capacity and the preset aging capacitor capacity threshold, the estimated service life of the zero-crossing energy storage capacitor is calculated. The step of calculating and generating the energy storage capacitor capacity based on the currents of the multiple energy storage branches and the voltages of the multiple energy storage capacitors includes: Among the multiple energy storage capacitor voltages, the initial energy storage voltage and discharge termination voltage of the zero-crossing energy storage capacitor are captured, and the energy storage voltage difference is calculated and generated. The energy storage capacitor capacity is calculated and generated based on the currents of multiple energy storage branches, the times corresponding to the currents of multiple energy storage branches, and the energy storage voltage difference. A reference energy storage unit is connected in parallel to the zero-crossing energy storage unit in the fast breaking device of the ultra-high speed circuit breaker. The reference energy storage unit includes a reference energy storage capacitor group connected in series and a second vacuum trigger switch. After sending the experimental test command to the AC power simulation device, the method further includes: Obtain the frequency of the test current change as the modulation inductor moves away from the end of the first vacuum trigger switch; After calculating and generating the energy storage capacitor capacity based on the multiple energy storage branch currents and multiple energy storage capacitor voltages, the method further includes: Adjust the reference capacitor capacity of the reference energy storage capacitor group according to the energy storage capacitor capacity; Send a comparison test command to the AC power supply simulation device, and send a closing command to the second vacuum trigger switch after detecting a fault current; The frequency of the reference current change at the end of the modulation inductor furthest from the second vacuum trigger switch is obtained, and a capacitance estimation error value is generated based on the frequency of the reference current change and the frequency of the test current change. The energy storage capacitor capacity is updated based on the reference capacitor capacity and the estimated error value of the capacitance value.

2. The method according to claim 1, characterized in that, The step of generating the capacitance estimation error value based on the frequency of change of the control current and the frequency of change of the test current includes: The first estimated capacity is calculated and generated based on the frequency of the test current change and the inductive reactance value of the pre-stored modulation inductor. A second estimated capacity is calculated based on the frequency of the change in the reference current and the inductive reactance of the modulation inductor. The capacity estimation error value is calculated based on the difference between the second estimated capacity and the first estimated capacity.

3. The method according to claim 2, characterized in that, The step of updating the energy storage capacitor capacity based on the reference capacitor capacity and the estimated error value of the capacitance value includes: If the capacitance estimation error value is greater than the preset capacitance calculation error threshold, then a reference adjustment capacitance value is calculated and generated based on the capacitance estimation error value and the reference capacitance value, and the energy storage capacitor capacity is updated based on the reference adjustment capacitance value. If the capacitance estimation error is less than or equal to the capacitance calculation error threshold, then the energy storage capacitor capacity is updated based on the reference capacitor capacity.

4. The method according to claim 3, characterized in that, The step of calculating the estimated lifespan of the zero-crossing energy storage capacitor based on the energy storage capacitor capacity and a preset aging capacitor capacity threshold includes: Obtain the current ambient temperature of the fast-breaking device of the ultra-high-speed circuit breaker; Based on preset ambient temperature influence data and the current ambient temperature, a current temperature influence coefficient is generated. The ambient temperature influence data includes multiple temperature influence coefficients and multiple corresponding temperature values. The current differential exclusion capacitor capacity is calculated and generated based on the energy storage capacitor capacity and the current temperature influence coefficient. The estimated service life is calculated based on the pre-stored capacitor aging curve data, the aging capacitor capacity threshold, and the current differential exclusion capacitor capacity.

5. The method according to claim 4, characterized in that, The step of calculating and generating the estimated service life based on the pre-stored capacitor aging curve data, the aging capacitor capacity threshold, and the current differentially excluded capacitor capacity includes: Obtain historical ambient temperature information of the working environment of the ultra-high speed circuit breaker fast breaking device, and filter out the historical peak ambient temperature from the historical ambient temperature information; Based on the historical peak ambient temperature and the ambient temperature influence data, a peak temperature influence coefficient is generated; Based on the peak temperature influence coefficient and the aging capacitor capacity threshold, the peak differential exclusion capacitor capacity is calculated and generated. Based on the current differential exclusion capacitor capacity, the peak differential exclusion capacitor capacity, and the capacitor aging curve data, an estimated service life is generated.

6. A device testing and maintenance system based on a fast-breaking device for ultra-high-speed circuit breakers, characterized in that, The system includes an AC power simulation device and a detection and maintenance processing terminal, wherein the detection and maintenance processing terminal includes: The control command sending module is used to send experimental test commands to the AC power supply simulation equipment; The information receiving module is used to receive in real time the energy storage branch current fed back by the first current transformer, the main branch current fed back by the second current transformer, and the energy storage capacitor voltage across the zero-crossing energy storage capacitor fed back by the voltage transformer. The capacitance value calculation and processing module is used to calculate and generate the energy storage capacitor capacity based on the current of multiple energy storage branches and the voltage of multiple energy storage capacitors. The capacitor life estimation module is used to calculate and generate the estimated lifespan of the zero-crossing energy storage capacitor based on the capacity of the energy storage capacitor and a preset aging capacitor capacity threshold. The capacitance value calculation and processing module is also used for: Among multiple energy storage capacitor voltages, the initial energy storage voltage and discharge termination voltage of the zero-crossing energy storage capacitor are captured, and the energy storage voltage difference is calculated. The energy storage capacitor capacity is calculated based on the currents of multiple energy storage branches, the times corresponding to the currents of multiple energy storage branches, and the energy storage voltage difference. The testing and maintenance processing terminal also includes a capacitor value update module: The capacitor value update module is used to obtain the frequency of the test current change when the modulation inductor is far away from the end of the first vacuum trigger switch; Adjust the capacity of the reference energy storage capacitor group according to the capacity of the energy storage capacitor. Send a comparison test command to the AC power supply simulation equipment, and send a closing command to the second vacuum trigger switch after detecting the fault current; Obtain the reference current change frequency at the end of the modulation inductor far from the second vacuum trigger switch, and generate a capacitance estimation error value based on the reference current change frequency and the test current change frequency. The energy storage capacitor capacity is updated based on the error value estimated from the reference capacitor capacity and capacitance value.

7. A detection and maintenance processing terminal, characterized in that, The detection and maintenance processing terminal includes a processor and a memory. The memory stores at least one instruction, at least one program, code set, or instruction set. The at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the device detection and maintenance method based on the ultra-high speed circuit breaker fast breaking device as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The storage medium stores at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by a processor to implement the device detection and maintenance method based on the ultra-high speed circuit breaker fast breaking device as described in any one of claims 1 to 5.

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