Switch cabinet live display detection method and device, computer equipment, readable storage medium and program product

Abstract

The application relates to a switch cabinet live display detection method and device, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: injecting a low-voltage high-frequency pilot signal into a switch cabinet live display, collecting voltage data and current data of the switch cabinet live display and calculating impedance modulus and impedance phase angle of the switch cabinet live display; determining the state of the switch cabinet live display based on a fault feature library, the impedance modulus and the impedance phase angle; if the state is normal, generating a high-voltage signal that increases at a preset slope based on a nonlinear transmission characteristic equation of a single-phase alternating current voltage regulation circuit and a preset soft start time curve and injecting the high-voltage signal into the switch cabinet live display; and when the high-voltage signal reaches a preset value, acquiring detection voltage, detection current, detection impedance and running time data of the switch cabinet live display in real time and judging whether the switch cabinet live display has a fault. The sampling method can avoid surge current damage.

Description

Technical Field

[0001] This application relates to the field of power equipment testing technology, and in particular to a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for testing a switchgear live indicator. Background Technology

[0002] With the rapid development of technologies in the field of power distribution network equipment status perception and intelligent diagnosis, high-voltage precision testing technology for switchgear live indicator has emerged. This technology, with its core features of high-voltage soft-start control, closed-loop voltage regulation, and real-time impedance protection, enables non-destructive testing of the insulation performance and operational characteristics of live indicators, significantly improving the safety and accuracy of the testing process. In contrast, traditional technologies for testing switchgear live indicators often employ direct pressure testing or periodic offline testing. Specifically, the live indicator must first be removed from the switchgear and transported to a professional testing laboratory. A fixed high-voltage signal is then manually adjusted on a high-voltage test bench, and voltage and current data are read using pointer-type instruments. Finally, the equipment's qualification is determined based on empirical values. In some field testing scenarios, a power frequency high-voltage generator is used for instantaneous pressure testing, omitting the initial status assessment and stable voltage ramp-up process.

[0003] However, this traditional detection method is prone to surge current due to direct instantaneous pressure application, which can cause irreversible damage to the precision capacitor components inside the charged display. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, device, computer equipment, computer-readable storage medium, and computer program product for detecting live indicators of switchgear that can avoid damage from surge current, in order to address the above-mentioned technical problems.

[0005] Firstly, this application provides a method for detecting a live indicator in a switchgear, comprising:

[0006] A low-voltage, high-frequency pilot signal is injected into the switchgear live indicator, and the voltage and current data of the switchgear live indicator are collected.

[0007] Based on the voltage data and the current data, the impedance magnitude and impedance phase angle of the switchgear live indicator are calculated; based on the fault feature database, the impedance magnitude and the impedance phase angle, the state of the switchgear live indicator is determined.

[0008] If the state is normal, a high-voltage signal is generated based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, and the high-voltage signal is injected into the switch cabinet energized display; the high-voltage signal stops increasing after it reaches a preset value.

[0009] When the high voltage signal reaches a preset value, the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator are acquired in real time; based on the detection voltage, detection current, detection impedance, and running time data, it is determined whether the switchgear live indicator has a fault.

[0010] In one embodiment, the generation of a high-voltage signal that rises smoothly at a preset slope based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulator circuit and a preset soft-start time curve includes:

[0011] Based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulator circuit and a preset value of the high-voltage signal, the target trigger delay angle is calculated using a preset method. The trigger delay angle in the off state is taken as the initial trigger delay angle. Based on a preset soft-start time curve, the total time and voltage rise slope of the high-voltage signal from 0 to the preset value are determined. The adjustment interval from the initial trigger delay angle to the target trigger delay angle is divided into multiple continuous adjustment periods according to the time dimension. A trigger delay angle adjustment step size matching the voltage rise slope is assigned to each adjustment period to obtain the mapping relationship between time and trigger delay angle. Based on the mapping relationship, the trigger delay angle is controlled to gradually decrease by a preset step size to generate a high-voltage signal that rises smoothly at a preset slope.

[0012] In one embodiment, the method further includes:

[0013] Based on the preset values ​​of the detected voltage and the high-voltage signal, the voltage error is determined; based on the voltage error, the adjustment increment of the conduction angle is calculated using a proportional-integral algorithm; based on the adjustment increment, the detected voltage is corrected.

[0014] In one embodiment, the method further includes:

[0015] Every preset power frequency cycle, it is determined whether the current detection impedance is less than the preset minimum impedance threshold; if the determination result is that the detection impedance is less than the preset minimum impedance threshold, the injection of the high voltage signal into the switch cabinet live display is stopped, and the current detection impedance, detection voltage, detection current, and current running time are reported.

[0016] In one embodiment, calculating the impedance magnitude and impedance phase angle of the switchgear live indicator based on the voltage data and the current data includes:

[0017] Based on the number of discrete sampling points, the voltage data, and the current data, the root mean square (RMS) values ​​of the voltage and current are determined; the RMS value of the voltage is divided by the RMS value of the current to obtain the impedance modulus of the switchgear live indicator; the RMS value of the voltage is multiplied by the RMS value of the current to obtain the apparent power; the average active power is determined based on the voltage data and the current data; and the impedance phase angle of the switchgear live indicator is determined based on the reactive power, the apparent power, and the average active power.

[0018] In one embodiment, the method further includes:

[0019] When the detection time reaches the preset time, or when a stop detection command is received, the high voltage signal is reduced to a safe level according to the reverse soft start curve.

[0020] Secondly, this application also provides a switchgear live indicator detection device, comprising:

[0021] The injection module is used to inject low-voltage high-frequency pilot signals into the switchgear live indicator and to collect voltage and current data from the switchgear live indicator.

[0022] The calculation module is used to calculate the impedance magnitude and impedance phase angle of the switchgear live indicator based on the voltage data and the current data; and to determine the state of the switchgear live indicator based on the fault feature library, the impedance magnitude and the impedance phase angle.

[0023] The generation module is used to generate a high-voltage signal that increases at a preset slope based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and a preset soft-start time curve if the state is normal, and inject the high-voltage signal into the switch cabinet live display; the high-voltage signal stops increasing after it reaches a preset value;

[0024] The judgment module is used to acquire the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator in real time when the high voltage signal reaches a preset value; and to determine whether the switchgear live indicator has a fault based on the detection voltage, detection current, detection impedance, and running time data.

[0025] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0026] A low-voltage, high-frequency pilot signal is injected into the switchgear live indicator, and the voltage and current data of the switchgear live indicator are collected.

[0027] Based on the voltage data and the current data, the impedance magnitude and impedance phase angle of the switchgear live indicator are calculated; based on the fault feature database, the impedance magnitude and the impedance phase angle, the state of the switchgear live indicator is determined.

[0028] If the state is normal, a high-voltage signal is generated based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, and the high-voltage signal is injected into the switch cabinet energized display; the high-voltage signal stops increasing after it reaches a preset value.

[0029] When the high voltage signal reaches a preset value, the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator are acquired in real time; based on the detection voltage, detection current, detection impedance, and running time data, it is determined whether the switchgear live indicator has a fault.

[0030] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0031] A low-voltage, high-frequency pilot signal is injected into the switchgear live indicator, and the voltage and current data of the switchgear live indicator are collected.

[0032] Based on the voltage data and the current data, the impedance magnitude and impedance phase angle of the switchgear live indicator are calculated; based on the fault feature database, the impedance magnitude and the impedance phase angle, the state of the switchgear live indicator is determined.

[0033] If the state is normal, a high-voltage signal is generated based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, and the high-voltage signal is injected into the switch cabinet energized display; the high-voltage signal stops increasing after it reaches a preset value.

[0034] When the high voltage signal reaches a preset value, the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator are acquired in real time; based on the detection voltage, detection current, detection impedance, and running time data, it is determined whether the switchgear live indicator has a fault.

[0035] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0036] A low-voltage, high-frequency pilot signal is injected into the switchgear live indicator, and the voltage and current data of the switchgear live indicator are collected.

[0037] Based on the voltage data and the current data, the impedance magnitude and impedance phase angle of the switchgear live indicator are calculated; based on the fault feature database, the impedance magnitude and the impedance phase angle, the state of the switchgear live indicator is determined.

[0038] If the state is normal, a high-voltage signal is generated based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, and the high-voltage signal is injected into the switch cabinet energized display; the high-voltage signal stops increasing after it reaches a preset value.

[0039] When the high voltage signal reaches a preset value, the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator are acquired in real time; based on the detection voltage, detection current, detection impedance, and running time data, it is determined whether the switchgear live indicator has a fault.

[0040] The aforementioned method, apparatus, computer equipment, computer-readable storage medium, and computer program product for detecting live indicators of switchgear firstly inject a low-voltage, high-frequency pilot signal into the live indicator of the switchgear to collect voltage and current data. Then, based on the voltage and current data, the impedance magnitude and impedance phase angle of the live indicator are calculated. Based on a fault feature database, the impedance magnitude, and the impedance phase angle, the state of the live indicator is determined. If the state is normal, a high-voltage signal increasing at a preset slope is generated based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulating circuit and a preset soft-start time curve, and this high-voltage signal is injected into the live indicator. The high-voltage signal increases to a preset value and then stops increasing. When the high-voltage signal reaches the preset value, the detection voltage, detection current, detection impedance, and runtime data of the live indicator are acquired in real time. Based on the detection voltage, detection current, detection impedance, and runtime data, it is determined whether the live indicator of the switchgear has a fault. This application first determines the initial state of the equipment in advance by analyzing the injection and impedance characteristics of low-voltage high-frequency pilot signals, thus preventing equipment with obvious faults from entering the high-voltage detection stage and avoiding the risk of faulty equipment under high voltage from the source. Then, based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, the high-voltage signal is controlled to rise steadily at a preset slope, rather than the instantaneous pressurization of the traditional method. This allows the high-voltage output voltage to gradually approach the preset value from 0, with no voltage abrupt changes or current surges throughout the process. This completely solves the technical problem of surge currents caused by instantaneous voltage impacts in the traditional direct pressurization method, which can cause irreversible damage to the precision capacitors inside the live display. At the same time, real-time impedance and voltage monitoring during the high-voltage steady-state stage further ensures the safety of the detection process, achieving a dual improvement in detection accuracy and equipment protection. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a flowchart illustrating a method for detecting a live indicator on a switchgear in one embodiment.

[0043] Figure 2 This is a detailed flowchart of a switchgear live indicator detection method in one embodiment;

[0044] Figure 3This is a structural block diagram of a switch cabinet live display detection device in one embodiment;

[0045] Figure 4 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0047] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0048] In one embodiment, such as Figure 1 As shown, a method for detecting a live indicator on a switchgear is provided. This embodiment illustrates the method by applying it to a terminal. It is understood that this method can also be applied to a server, and further to a system including both a terminal and a server, and is implemented through interaction between the terminal and the server. In this embodiment, the method includes the following steps:

[0049] Step 102: Inject a low-voltage, high-frequency pilot signal into the switchgear live indicator and collect the voltage and current data of the switchgear live indicator.

[0050] Among them, the switchgear live indicator is an electrical safety monitoring device installed on high-voltage switchgear. Its core function is to visually display whether the high-voltage lines inside the switchgear are energized. It can also be equipped with extended functions such as voltage detection, phase verification, and grounding indication. It is widely used in medium-voltage distribution network systems of 3kV~35kV. The injected pilot signal is a low-voltage, high-frequency, small signal (the voltage level is much lower than the rated operating voltage of the live indicator, and the current amplitude is controlled in the milliampere level).

[0051] Optionally, the switchgear live indicator can be a 10kV switchgear live indicator. The injection of the low-voltage pilot signal specifically involves injecting a sinusoidal pilot signal, as shown in the formula:

[0052]

[0053] in, The preset safety amplitude, For a specific test angular frequency, t is time.

[0054] Step 104: Based on the voltage data and the current data, calculate the impedance magnitude and impedance phase angle of the switchgear live indicator; based on the fault feature library, the impedance magnitude and the impedance phase angle, determine the state of the switchgear live indicator.

[0055] The fault feature library is a pre-constructed multi-dimensional feature set, including threshold ranges for impedance magnitude and impedance phase angle under typical operating conditions such as normal state, insulation degradation state, and internal short circuit state of the switchgear live indicator. When determining the equipment state, the calculated actual impedance magnitude and impedance phase angle are matched with the threshold ranges in the fault feature library. The main control unit module has a built-in fault feature library, which defines the lower limit threshold of short-circuit impedance. Upper limit threshold of circuit breaking impedance and the phase angle acceptance range of capacitive load The main control unit module performs topology identification based on the calculation results: when When the system determines that a short circuit has occurred; when When the system determines the circuit to be open, it only does so when... and At that time, the system determines that the load is a capacitively coupled sensor and releases the lockout on the high-voltage thyristor regulating circuit.

[0056] Step 106: If the state is normal, then based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, a high-voltage signal that increases at a preset slope is generated and injected into the switch cabinet energized display; the high-voltage signal stops increasing after it reaches a preset value.

[0057] The preset soft-start time curve is a pre-configured voltage-time correlation curve that defines the total time for the high-voltage signal to rise from 0 to a preset value, the voltage rise slope for each time period, and the allowable voltage fluctuation range. The preset slope is determined based on the soft-start time curve, for example, by increasing linearly.

[0058] Step 108: When the high voltage signal reaches the preset value, the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator are acquired in real time; based on the detection voltage, detection current, detection impedance, and running time data, it is determined whether the switchgear live indicator has a fault.

[0059] The real-time data acquisition process is achieved through a high-precision voltage sensor, current sensor, and impedance calculation module integrated with the high-voltage output circuit. The sampling frequency is no less than 1kHz to ensure that instantaneous parameter fluctuations during the detection process are captured. The detection voltage is the actual high-voltage value at both ends of the live display acquired by the sensor, the detection current is the real-time current value of the high-voltage circuit, and the detection impedance is dynamically calculated from the ratio of the detection voltage to the detection current. The runtime data is accumulated by the system timing module from the time the high-voltage signal reaches the preset value.

[0060] Optionally, the fault judgment logic is executed based on preset multi-dimensional thresholds and time constraints, as follows: Detection voltage threshold determination: The allowable fluctuation range of the detection voltage is set to ±2% of the preset high voltage value. If the real-time detection voltage is continuously fluctuating for 3... If the voltage or impedance exceeds this range for a single power frequency cycle, the live indicator is deemed to have an abnormal voltage withstand fault, indicating substandard insulation performance. Impedance threshold determination: A pre-configured normal impedance threshold range for the live indicator under a preset high voltage value is used. If the real-time detected impedance is lower than the preset minimum impedance threshold, an internal short circuit risk is identified. If the detected impedance consistently exceeds the preset maximum impedance threshold and the fluctuation exceeds 15%, insulation degradation is identified. Running time constraint determination: A minimum effective detection time is set. If the aforementioned voltage or impedance abnormalities occur before reaching the minimum effective detection time, the equipment is directly identified as faulty. If the real-time data remains within the normal threshold range throughout and the running time reaches the preset detection time, the equipment is deemed fault-free. Comprehensive fault determination: The system logically integrates the above three types of determination results. If any determination result indicates a fault, the final fault conclusion is output, and the voltage, current, impedance data, and cumulative running time at the time of the fault occurrence are recorded. If all determination results meet the normal conditions, a qualified equipment conclusion is output.

[0061] The above-mentioned method for detecting a live indicator of a switchgear involves first injecting a low-voltage, high-frequency pilot signal into the live indicator and collecting its voltage and current data. Then, based on the voltage and current data, the impedance magnitude and impedance phase angle of the live indicator are calculated. Based on a fault feature database, the impedance magnitude, and the impedance phase angle, the state of the live indicator is determined. If the state is normal, a high-voltage signal with a preset slope is generated based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulator circuit and a preset soft-start time curve, and this high-voltage signal is injected into the live indicator. The high-voltage signal stops increasing after reaching a preset value. Once the high-voltage signal reaches the preset value, the detection voltage, detection current, detection impedance, and runtime data of the live indicator are acquired in real time. Based on the detection voltage, detection current, detection impedance, and runtime data, it is determined whether the live indicator has a fault. This application first determines the initial state of the equipment in advance by analyzing the injection and impedance characteristics of low-voltage high-frequency pilot signals, thus preventing equipment with obvious faults from entering the high-voltage detection stage and avoiding the risk of faulty equipment under high voltage from the source. Then, based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, the high-voltage signal is controlled to rise steadily at a preset slope, rather than the instantaneous pressurization of the traditional method. This allows the high-voltage output voltage to gradually approach the preset value from 0, without voltage abrupt changes or current surges throughout the process. This completely solves the technical problem of surge currents caused by instantaneous voltage impacts in the traditional direct pressurization method, which can cause irreversible damage to the precision capacitors inside the live display. At the same time, real-time impedance and voltage monitoring during the high-voltage steady-state stage further ensures the safety of the detection process, achieving a dual improvement in detection accuracy and equipment protection.

[0062] In an exemplary embodiment, the generation of a high-voltage signal that rises smoothly at a preset slope based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulator circuit and a preset soft-start time curve includes:

[0063] Based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulator circuit and a preset value of the high-voltage signal, the target trigger delay angle is calculated using a preset method. The trigger delay angle in the off state is taken as the initial trigger delay angle. Based on a preset soft-start time curve, the total time and voltage rise slope of the high-voltage signal from 0 to the preset value are determined. The adjustment interval from the initial trigger delay angle to the target trigger delay angle is divided into multiple continuous adjustment periods according to the time dimension. A trigger delay angle adjustment step size matching the voltage rise slope is assigned to each adjustment period to obtain the mapping relationship between time and trigger delay angle. Based on the mapping relationship, the trigger delay angle is controlled to gradually decrease by a preset step size to generate a high-voltage signal that rises smoothly at a preset slope.

[0064] For example, considering the effective value of the output voltage in a single-phase AC voltage regulating circuit With the trigger delay angle of the thyristor There exists a nonlinear relationship, which follows the nonlinear transfer characteristic equation of a single-phase AC voltage regulator circuit:

[0065]

[0066] in This refers to the input power supply voltage. Assume the preset value of the high-voltage signal is 10kV, and the effective value of the input power supply voltage is... For 12kV, =10kV Substituting 12kV into the equation, the target trigger delay angle is calculated using a piecewise linear interpolation algorithm. =60°; Select the trigger delay angle corresponding to the fully off state of the high-voltage thyristor. =180° as the initial trigger delay angle; read the preset soft start time curve to determine that the total time for the high voltage signal to rise from 0 to 10kV is 10s, and the corresponding voltage rise slope is 1kV / s. The adjustment range from the initial trigger delay angle of 180° to the target trigger delay angle of 60° (total adjustment range of 120°) is divided into 10 consecutive adjustment periods, each lasting 1 second. Based on the linear correlation between the voltage rise slope and the trigger delay angle, a trigger delay angle adjustment step of 12° is assigned to each period, establishing a time-trigger delay angle mapping relationship. For example, the trigger delay angle drops to 168° at the end of the 1st second, to 156° at the end of the 2nd second, and so on until it reaches the target value of 60° at the end of the 10th second. According to the above mapping relationship, the system sends control commands to the thyristor trigger module of the single-phase AC voltage regulation circuit, controlling the trigger delay angle to decrease by 12° every 1 second, synchronously driving the thyristor conduction angle to gradually increase, and finally generating a high-voltage signal that rises smoothly from 0 to 10kV at a slope of 1kV / s, without voltage overshoot or surge current throughout the process.

[0067] In this embodiment, by establishing a precise mapping relationship between the trigger delay angle and the soft start time, and by performing parameter pre-calculation in conjunction with the nonlinear transmission characteristic equation of the single-phase AC voltage regulation circuit, it is possible to achieve smooth voltage boost control of the high-voltage signal, thus completely solving the technical problem that the traditional direct voltage application method is prone to generating surge current and damaging the precision components inside the charged display.

[0068] In one exemplary embodiment, the method further includes:

[0069] Based on the preset values ​​of the detected voltage and the high-voltage signal, the voltage error is determined; based on the voltage error, the adjustment increment of the conduction angle is calculated using a proportional-integral algorithm; based on the adjustment increment, the detected voltage is corrected.

[0070] For example, the error is obtained by subtracting the detection voltage from the preset value of the high-voltage signal. The proportional-integral algorithm is used to calculate the adjustment increment of the conduction angle. :

[0071]

[0072] Where k is the sequence number, It is a proportionality coefficient. It is the integral coefficient. By adjusting the increment... Correct trigger delay angle ,Right now .

[0073] In this embodiment, by combining the discretized proportional-integral (PI) algorithm with the dynamic correction logic of the trigger delay angle, precise voltage regulation control of the high-voltage detection voltage can be achieved, effectively offsetting the interference of factors such as grid voltage fluctuations and load impedance changes on the output voltage.

[0074] In one exemplary embodiment, the method further includes:

[0075] Every preset power frequency cycle, it is determined whether the current detection impedance is less than the preset minimum impedance threshold; if the determination result is that the detection impedance is less than the preset minimum impedance threshold, the injection of the high voltage signal into the switch cabinet live display is stopped, and the current detection impedance, detection voltage, detection current, and current running time are reported.

[0076] For example, every preset power frequency cycle, it is determined whether the current detection impedance is less than the preset minimum impedance threshold; if the determination result is that the detection impedance is less than the preset minimum impedance threshold, the highest priority hardware interrupt will be triggered immediately, the trigger pulse will be forcibly blocked within milliseconds, the power output will be cut off, and the current detection impedance, detection voltage, detection current, and current running time will be reported.

[0077] In this embodiment, through the dual protection mechanism of real-time impedance monitoring based on a preset power frequency cycle and hardware-level fast protection interruption, instantaneous response and risk isolation can be achieved for short circuit or insulation breakdown faults in the live display of the switchgear.

[0078] In an exemplary embodiment, calculating the impedance magnitude and impedance phase angle of the switchgear live indicator based on the voltage data and the current data includes:

[0079] Based on the number of discrete sampling points, the voltage data, and the current data, the root mean square (RMS) values ​​of the voltage and current are determined; the RMS value of the voltage is divided by the RMS value of the current to obtain the impedance modulus of the switchgear live indicator; the RMS value of the voltage is multiplied by the RMS value of the current to obtain the apparent power; the average active power is determined based on the voltage data and the current data; and the impedance phase angle of the switchgear live indicator is determined based on the reactive power, the apparent power, and the average active power.

[0080] For example, a discrete voltage sequence containing load response information is acquired based on the number of discrete sampling points. and current discrete sequence Calculate the root mean square value of voltage. and root mean square value of current :

[0081]

[0082]

[0083] Based on the values ​​calculated above, the impedance magnitude of the load is further calculated. This parameter reflects the overall impedance of the load to current, and its calculation formula is as follows:

[0084]

[0085] To further differentiate the reactive properties of the load, and especially to accurately identify the unique capacitive characteristics of a live display, the main control unit module also needs to calculate the impedance phase angle. This process involves apparent power. With average active power The calculation, where apparent power average active power The value is obtained by averaging the instantaneous product of the discrete voltage sequence and the discrete current sequence over the sampling period:

[0086]

[0087] Furthermore, the main control unit module utilizes the inverse cosine function and reactive power. The sign characteristics are used to calculate the phase angle. :

[0088]

[0089] Here, reactive power Used to determine whether the phase is ahead or behind.

[0090] In this embodiment, the root mean square calculation method of discrete sampling sequence is adopted, which can effectively filter out random noise interference from single sampling and ensure the calculation accuracy of voltage and current effective values. The impedance modulus value is directly obtained by the ratio of voltage effective value to current effective value, which can intuitively reflect the overall resistance of the equipment to current and quickly determine whether there are obvious impedance anomalies such as short circuits and insulation degradation. More importantly, the impedance phase angle is calculated by combining the sign characteristics of apparent power, average active power and reactive power. This not only quantifies the phase difference between voltage and current, but also accurately distinguishes the capacitive and resistive reactance properties of the live display. This provides accurate and reliable data support for subsequent equipment status judgment based on fault feature library, realizing a closed loop connection from "signal acquisition" to "feature extraction".

[0091] In one exemplary embodiment, the method further includes:

[0092] When the detection time reaches the preset time, or when a stop detection command is received, the high voltage signal is reduced to a safe level according to the reverse soft start curve.

[0093] For example, when the detection time reaches 15 minutes, or after receiving a stop detection command, the high voltage signal is reduced to a safe level according to the reverse soft start curve.

[0094] In this embodiment, the smooth voltage reduction control logic of the reverse soft-start curve enables the shockless exit of the high-voltage signal, completely solving the technical problem that directly cutting off the high-voltage power supply in the traditional detection process easily generates reverse surge voltage, thereby damaging the internal capacitor components of the switch cabinet's live display and the power module of the detection device.

[0095] In one exemplary embodiment, such as Figure 2 As shown, a method for detecting a live indicator of a switchgear includes: injecting a low-voltage, high-frequency pilot signal into the live indicator of the switchgear, and collecting voltage and current data from the live indicator of the switchgear; specifically, injecting the low-voltage pilot signal involves injecting a sinusoidal pilot signal, as shown in the formula:

[0096]

[0097] in, The preset safety amplitude, For a specific test angular frequency, t is time. A discrete voltage sequence containing load response information is acquired based on the number of discrete sampling points. and current discrete sequence Calculate the root mean square value of voltage. and root mean square value of current :

[0098]

[0099]

[0100] Based on the values ​​calculated above, the impedance magnitude of the load is further calculated. This parameter reflects the overall impedance of the load to current, and its calculation formula is as follows:

[0101]

[0102] To further differentiate the reactive properties of the load, and especially to accurately identify the unique capacitive characteristics of a live display, the main control unit module also needs to calculate the impedance phase angle. This process involves apparent power. With average active power The calculation, where apparent power average active power The value is obtained by averaging the instantaneous product of the discrete voltage sequence and the discrete current sequence over the sampling period:

[0103]

[0104] Furthermore, the main control unit module utilizes the inverse cosine function and reactive power. The sign characteristics are used to calculate the phase angle. :

[0105]

[0106] Here, reactive power Used to determine the phase lead or lag state. Based on the fault feature library, the impedance magnitude, and the impedance phase angle, the state of the switchgear live indicator is determined; if the state is normal, a high-voltage signal that increases at a preset slope is generated based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and a preset soft-start time curve, and the high-voltage signal is injected into the switchgear live indicator; the high-voltage signal stops increasing after reaching a preset value; the process of generating the high-voltage signal includes: taking into account the effective value of the output voltage in the single-phase AC voltage regulating circuit... With the trigger delay angle of the thyristor There exists a nonlinear relationship, which follows the nonlinear transfer characteristic equation of a single-phase AC voltage regulator circuit:

[0107]

[0108] in, This refers to the input power supply voltage. Assume the preset value of the high-voltage signal is 10kV, and the effective value of the input power supply voltage is... For 12kV, =10kV Substituting 12kV into the equation, the target trigger delay angle is calculated using a piecewise linear interpolation algorithm. =60°; Select the trigger delay angle corresponding to the fully off state of the high-voltage thyristor. =180° as the initial trigger delay angle; read the preset soft start time curve to determine that the total time for the high voltage signal to rise from 0 to 10kV is 10s, and the corresponding voltage rise slope is 1kV / s. The adjustment range from the initial trigger delay angle of 180° to the target trigger delay angle of 60° (total adjustment range of 120°) is divided into 10 consecutive adjustment periods, each lasting 1 second. Based on the linear correlation between the voltage rise slope and the trigger delay angle, a trigger delay angle adjustment step of 12° is assigned to each period, establishing a time-trigger delay angle mapping relationship. For example, the trigger delay angle drops to 168° at the end of the 1st second, to 156° at the end of the 2nd second, and so on until it reaches the target value of 60° at the end of the 10th second. According to the above mapping relationship, the system sends control commands to the thyristor trigger module of the single-phase AC voltage regulation circuit, controlling the trigger delay angle to decrease by 12° every 1 second, synchronously driving the thyristor conduction angle to gradually increase, and finally generating a high-voltage signal that rises smoothly from 0 to 10kV at a slope of 1kV / s, without voltage overshoot or surge current throughout the process. When the high-voltage signal reaches a preset value, the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator are acquired in real time. Based on the detection voltage, detection current, detection impedance, and running time data, it is determined whether the switchgear live indicator is faulty. Furthermore, the detection process also includes subtracting the detection voltage from the preset value of the high-voltage signal to obtain the error. The proportional-integral algorithm is used to calculate the adjustment increment of the conduction angle. :

[0109]

[0110] Where k is the sequence number, It is a proportionality coefficient. It is the integral coefficient. By adjusting the increment... Correct trigger delay angle ,Right now In addition, it includes: every preset power frequency cycle, determining whether the current detection impedance is less than a preset minimum impedance threshold; if the determination result is that the detection impedance is less than the preset minimum impedance threshold, a highest priority hardware interrupt will be immediately triggered, forcibly blocking the trigger pulse within milliseconds, cutting off the power output, and reporting the current detection impedance, detection voltage, detection current, and current running time. When the detection time reaches 15 minutes, or after receiving a stop detection command, the high voltage signal is reduced to a safe level according to the reverse soft-start curve.

[0111] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0112] In one exemplary embodiment, such as Figure 3 As shown, a switchgear live indicator detection device is provided, comprising: an injection module 301, a calculation module 302, a generation module 303, and a judgment module 304, wherein:

[0113] The injection module 301 is used to inject a low-voltage high-frequency pilot signal into the switch cabinet live indicator and to collect the voltage and current data of the switch cabinet live indicator.

[0114] Calculation module 302 is used to calculate the impedance magnitude and impedance phase angle of the switchgear live indicator based on the voltage data and the current data; and to determine the state of the switchgear live indicator based on the fault feature library, the impedance magnitude and the impedance phase angle.

[0115] The generation module 303 is used to generate a high-voltage signal that increases at a preset slope based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and a preset soft-start time curve if the state is normal, and inject the high-voltage signal into the switch cabinet live display; the high-voltage signal stops increasing after it reaches a preset value;

[0116] The judgment module 304 is used to acquire the detection voltage, detection current, detection impedance and running time data of the switchgear live indicator in real time when the high voltage signal reaches a preset value; and to determine whether the switchgear live indicator has a fault based on the detection voltage, detection current, detection impedance and running time data.

[0117] In one exemplary embodiment, the generation module is further configured to:

[0118] Based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulator circuit and a preset value of the high-voltage signal, the target trigger delay angle is calculated using a preset method. The trigger delay angle in the off state is taken as the initial trigger delay angle. Based on a preset soft-start time curve, the total time and voltage rise slope of the high-voltage signal from 0 to the preset value are determined. The adjustment interval from the initial trigger delay angle to the target trigger delay angle is divided into multiple continuous adjustment periods according to the time dimension. A trigger delay angle adjustment step size matching the voltage rise slope is assigned to each adjustment period to obtain the mapping relationship between time and trigger delay angle. Based on the mapping relationship, the trigger delay angle is controlled to gradually decrease by a preset step size to generate a high-voltage signal that rises smoothly at a preset slope.

[0119] In one exemplary embodiment, the determination module is further configured to:

[0120] Based on the preset values ​​of the detected voltage and the high-voltage signal, the voltage error is determined; based on the voltage error, the adjustment increment of the conduction angle is calculated using a proportional-integral algorithm; based on the adjustment increment, the detected voltage is corrected.

[0121] In one exemplary embodiment, the determination module is further configured to:

[0122] Every preset power frequency cycle, it is determined whether the current detection impedance is less than the preset minimum impedance threshold; if the determination result is that the detection impedance is less than the preset minimum impedance threshold, the injection of the high voltage signal into the switch cabinet live display is stopped, and the current detection impedance, detection voltage, detection current, and current running time are reported.

[0123] In one exemplary embodiment, the computing module is further configured to:

[0124] Based on the number of discrete sampling points, the voltage data, and the current data, the root mean square (RMS) values ​​of the voltage and current are determined; the RMS value of the voltage is divided by the RMS value of the current to obtain the impedance modulus of the switchgear live indicator; the RMS value of the voltage is multiplied by the RMS value of the current to obtain the apparent power; the average active power is determined based on the voltage data and the current data; and the impedance phase angle of the switchgear live indicator is determined based on the reactive power, the apparent power, and the average active power.

[0125] In one exemplary embodiment, the determination module is further configured to:

[0126] When the detection time reaches the preset time, or when a stop detection command is received, the high voltage signal is reduced to a safe level according to the reverse soft start curve.

[0127] Each module in the aforementioned switchgear live indicator detection device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0128] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 4 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores the detection impedance, detection voltage, detection current, and operating time. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a method for detecting a live indicator on a switchgear.

[0129] Those skilled in the art will understand that Figure 4 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0130] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0131] A low-voltage, high-frequency pilot signal is injected into the switchgear live indicator, and the voltage and current data of the switchgear live indicator are collected.

[0132] Based on the voltage data and the current data, the impedance magnitude and impedance phase angle of the switchgear live indicator are calculated; based on the fault feature database, the impedance magnitude and the impedance phase angle, the state of the switchgear live indicator is determined.

[0133] If the state is normal, a high-voltage signal is generated based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, and the high-voltage signal is injected into the switch cabinet energized display; the high-voltage signal stops increasing after it reaches a preset value.

[0134] When the high voltage signal reaches a preset value, the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator are acquired in real time; based on the detection voltage, detection current, detection impedance, and running time data, it is determined whether the switchgear live indicator has a fault.

[0135] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0136] Based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulator circuit and a preset value of the high-voltage signal, the target trigger delay angle is calculated using a preset method. The trigger delay angle in the off state is taken as the initial trigger delay angle. Based on a preset soft-start time curve, the total time and voltage rise slope of the high-voltage signal from 0 to the preset value are determined. The adjustment interval from the initial trigger delay angle to the target trigger delay angle is divided into multiple continuous adjustment periods according to the time dimension. A trigger delay angle adjustment step size matching the voltage rise slope is assigned to each adjustment period to obtain the mapping relationship between time and trigger delay angle. Based on the mapping relationship, the trigger delay angle is controlled to gradually decrease by a preset step size to generate a high-voltage signal that rises smoothly at a preset slope.

[0137] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0138] Based on the preset values ​​of the detected voltage and the high-voltage signal, the voltage error is determined; based on the voltage error, the adjustment increment of the conduction angle is calculated using a proportional-integral algorithm; based on the adjustment increment, the detected voltage is corrected.

[0139] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0140] Every preset power frequency cycle, it is determined whether the current detection impedance is less than the preset minimum impedance threshold; if the determination result is that the detection impedance is less than the preset minimum impedance threshold, the injection of the high voltage signal into the switch cabinet live display is stopped, and the current detection impedance, detection voltage, detection current, and current running time are reported.

[0141] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0142] Based on the number of discrete sampling points, the voltage data, and the current data, the root mean square (RMS) values ​​of the voltage and current are determined; the RMS value of the voltage is divided by the RMS value of the current to obtain the impedance modulus of the switchgear live indicator; the RMS value of the voltage is multiplied by the RMS value of the current to obtain the apparent power; the average active power is determined based on the voltage data and the current data; and the impedance phase angle of the switchgear live indicator is determined based on the reactive power, the apparent power, and the average active power.

[0143] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0144] When the detection time reaches the preset time, or when a stop detection command is received, the high voltage signal is reduced to a safe level according to the reverse soft start curve.

[0145] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0146] A low-voltage, high-frequency pilot signal is injected into the switchgear live indicator, and the voltage and current data of the switchgear live indicator are collected.

[0147] Based on the voltage data and the current data, the impedance magnitude and impedance phase angle of the switchgear live indicator are calculated; based on the fault feature database, the impedance magnitude and the impedance phase angle, the state of the switchgear live indicator is determined.

[0148] If the state is normal, a high-voltage signal is generated based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, and the high-voltage signal is injected into the switch cabinet energized display; the high-voltage signal stops increasing after it reaches a preset value.

[0149] When the high voltage signal reaches a preset value, the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator are acquired in real time; based on the detection voltage, detection current, detection impedance, and running time data, it is determined whether the switchgear live indicator has a fault.

[0150] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0151] Based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulator circuit and a preset value of the high-voltage signal, the target trigger delay angle is calculated using a preset method. The trigger delay angle in the off state is taken as the initial trigger delay angle. Based on a preset soft-start time curve, the total time and voltage rise slope of the high-voltage signal from 0 to the preset value are determined. The adjustment interval from the initial trigger delay angle to the target trigger delay angle is divided into multiple continuous adjustment periods according to the time dimension. A trigger delay angle adjustment step size matching the voltage rise slope is assigned to each adjustment period to obtain the mapping relationship between time and trigger delay angle. Based on the mapping relationship, the trigger delay angle is controlled to gradually decrease by a preset step size to generate a high-voltage signal that rises smoothly at a preset slope.

[0152] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0153] Based on the preset values ​​of the detected voltage and the high-voltage signal, the voltage error is determined; based on the voltage error, the adjustment increment of the conduction angle is calculated using a proportional-integral algorithm; based on the adjustment increment, the detected voltage is corrected.

[0154] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0155] Every preset power frequency cycle, it is determined whether the current detection impedance is less than the preset minimum impedance threshold; if the determination result is that the detection impedance is less than the preset minimum impedance threshold, the injection of the high voltage signal into the switch cabinet live display is stopped, and the current detection impedance, detection voltage, detection current, and current running time are reported.

[0156] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0157] Based on the number of discrete sampling points, the voltage data, and the current data, the root mean square (RMS) values ​​of the voltage and current are determined; the RMS value of the voltage is divided by the RMS value of the current to obtain the impedance modulus of the switchgear live indicator; the RMS value of the voltage is multiplied by the RMS value of the current to obtain the apparent power; the average active power is determined based on the voltage data and the current data; and the impedance phase angle of the switchgear live indicator is determined based on the reactive power, the apparent power, and the average active power.

[0158] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0159] When the detection time reaches the preset time, or when a stop detection command is received, the high voltage signal is reduced to a safe level according to the reverse soft start curve.

[0160] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0161] A low-voltage, high-frequency pilot signal is injected into the switchgear live indicator, and the voltage and current data of the switchgear live indicator are collected.

[0162] Based on the voltage data and the current data, the impedance magnitude and impedance phase angle of the switchgear live indicator are calculated; based on the fault feature database, the impedance magnitude and the impedance phase angle, the state of the switchgear live indicator is determined.

[0163] If the state is normal, a high-voltage signal is generated based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, and the high-voltage signal is injected into the switch cabinet energized display; the high-voltage signal stops increasing after it reaches a preset value.

[0164] When the high voltage signal reaches a preset value, the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator are acquired in real time; based on the detection voltage, detection current, detection impedance, and running time data, it is determined whether the switchgear live indicator has a fault.

[0165] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0166] Based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulator circuit and a preset value of the high-voltage signal, the target trigger delay angle is calculated using a preset method. The trigger delay angle in the off state is taken as the initial trigger delay angle. Based on a preset soft-start time curve, the total time and voltage rise slope of the high-voltage signal from 0 to the preset value are determined. The adjustment interval from the initial trigger delay angle to the target trigger delay angle is divided into multiple continuous adjustment periods according to the time dimension. A trigger delay angle adjustment step size matching the voltage rise slope is assigned to each adjustment period to obtain the mapping relationship between time and trigger delay angle. Based on the mapping relationship, the trigger delay angle is controlled to gradually decrease by a preset step size to generate a high-voltage signal that rises smoothly at a preset slope.

[0167] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0168] Based on the preset values ​​of the detected voltage and the high-voltage signal, the voltage error is determined; based on the voltage error, the adjustment increment of the conduction angle is calculated using a proportional-integral algorithm; based on the adjustment increment, the detected voltage is corrected.

[0169] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0170] Every preset power frequency cycle, it is determined whether the current detection impedance is less than the preset minimum impedance threshold; if the determination result is that the detection impedance is less than the preset minimum impedance threshold, the injection of the high voltage signal into the switch cabinet live display is stopped, and the current detection impedance, detection voltage, detection current, and current running time are reported.

[0171] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0172] Based on the number of discrete sampling points, the voltage data, and the current data, the root mean square (RMS) values ​​of the voltage and current are determined; the RMS value of the voltage is divided by the RMS value of the current to obtain the impedance modulus of the switchgear live indicator; the RMS value of the voltage is multiplied by the RMS value of the current to obtain the apparent power; the average active power is determined based on the voltage data and the current data; and the impedance phase angle of the switchgear live indicator is determined based on the reactive power, the apparent power, and the average active power.

[0173] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0174] When the detection time reaches the preset time, or when a stop detection command is received, the high voltage signal is reduced to a safe level according to the reverse soft start curve.

[0175] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0176] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0177] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for detecting a live indicator in a switchgear cabinet, characterized in that, The method includes: A low-voltage, high-frequency pilot signal is injected into the switchgear live indicator, and the voltage and current data of the switchgear live indicator are collected. Based on the voltage data and the current data, the impedance magnitude and impedance phase angle of the switchgear live indicator are calculated; based on the fault feature library, the impedance magnitude and the impedance phase angle, the state of the switchgear live indicator is determined. If the state is normal, a high-voltage signal is generated based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and the preset soft-start time curve, and the high-voltage signal is injected into the switch cabinet energized display; the high-voltage signal stops increasing after it reaches a preset value. When the high voltage signal reaches a preset value, the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator are acquired in real time; based on the detection voltage, detection current, detection impedance, and running time data, it is determined whether the switchgear live indicator has a fault.

2. The method according to claim 1, characterized in that, The nonlinear transmission characteristic equation based on the single-phase AC voltage regulation circuit and the preset soft-start time curve generate a high-voltage signal that rises smoothly at a preset slope, including: Based on the nonlinear transmission characteristic equation of a single-phase AC voltage regulating circuit and the preset value of the high-voltage signal, the target trigger delay angle is calculated using a preset method. Use the trigger delay angle in the off state as the initial trigger delay angle; Based on the preset soft-start time curve, the total time and voltage rise slope of the high-voltage signal from 0 to the preset value are determined. The adjustment range from the initial trigger delay angle to the target trigger delay angle is divided along the time dimension to obtain multiple consecutive adjustment periods; Assign a trigger delay angle adjustment step size that matches the voltage rise slope to each adjustment period to obtain the mapping relationship between time and trigger delay angle; Based on the mapping relationship, the trigger delay angle is controlled to gradually decrease by a preset step size, generating a high-voltage signal that rises steadily at a preset slope.

3. The method according to claim 1, characterized in that, The method further includes: Based on the preset values ​​of the detected voltage and the high-voltage signal, the voltage error is determined; Based on the voltage error, the adjustment increment of the conduction angle is calculated using a proportional-integral algorithm; The detection voltage is corrected based on the adjustment increment.

4. The method according to claim 1, characterized in that, The method further includes: Every preset power frequency cycle, determine whether the current detection impedance is less than the preset minimum impedance threshold. If the determination result is that the detection impedance is less than the preset minimum impedance threshold, then the injection of the high voltage signal into the switch cabinet live display is stopped, and the detection impedance, detection voltage, detection current, and current running time at the current moment are reported.

5. The method according to claim 1, characterized in that, The calculation of the impedance magnitude and impedance phase angle of the switchgear live indicator based on the voltage and current data includes: Based on the number of discrete sampling points, the voltage data, and the current data, the root mean square value of the voltage and the root mean square value of the current are determined. Divide the root mean square value of the voltage by the root mean square value of the current to obtain the impedance modulus of the switch cabinet live display. The apparent power is obtained by multiplying the root mean square value of the voltage by the root mean square value of the current; the average active power is determined based on the voltage data and the current data; and the impedance phase angle of the switch cabinet live indicator is determined based on the reactive power, the apparent power, and the average active power.

6. The method according to claim 1, characterized in that, The method further includes: When the detection time reaches the preset time, or when a stop detection command is received, the high voltage signal is reduced to a safe level according to the reverse soft start curve.

7. A switchgear live indicator detection device, characterized in that, The device includes: The injection module is used to inject low-voltage high-frequency pilot signals into the switchgear live indicator and to collect voltage and current data from the switchgear live indicator. The calculation module is used to calculate the impedance magnitude and impedance phase angle of the switchgear live indicator based on the voltage data and the current data; and to determine the state of the switchgear live indicator based on the fault feature library, the impedance magnitude and the impedance phase angle. The generation module is used to generate a high-voltage signal that increases at a preset slope based on the nonlinear transmission characteristic equation of the single-phase AC voltage regulating circuit and a preset soft-start time curve if the state is normal, and inject the high-voltage signal into the switch cabinet live display; the high-voltage signal stops increasing after it reaches a preset value; The judgment module is used to acquire the detection voltage, detection current, detection impedance, and running time data of the switchgear live indicator in real time when the high voltage signal reaches a preset value; and to determine whether the switchgear live indicator has a fault based on the detection voltage, detection current, detection impedance, and running time data.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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