Rapid detection method and device for zero value of porcelain insulator based on impact current characteristics

Abstract

The invention discloses a porcelain insulator zero value rapid detection method and device based on impulse current characteristics. The method comprises the steps that high-voltage pulses are applied to the two ends of a to-be-detected porcelain insulator; an impact current signal in an insulator loop is sensed by using a magnetic ring, and the impact current signal is converted into an integral voltage signal through an integral circuit; the integral voltage signal is compared with a preset threshold value, if the integral voltage signal is higher than the preset threshold value, it is judged that the insulator is a zero-value insulator with the internal breakdown defect, and the preset threshold value is predetermined according to the given multiple of the integral voltage measured by a normal insulator under the same condition. By detecting the integral voltage signal of the breakdown current, misjudgment and missed judgment caused by different surface states or internal defect types of the insulator are effectively avoided, the detection accuracy and reliability are improved, and a new effective means is provided for rapid detection of the porcelain insulator.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission line defect detection and evaluation, and particularly to a method and device for quickly detecting zero-value porcelain insulators based on impulse current characteristics. Background Art

[0002] Line insulators are an important part of overhead transmission lines, and their main functions are to maintain the mechanical connection between the transmission conductors and the poles and electrical insulation. Disc suspension insulators are one of the most widely used types of insulators in lines. When in operation, insulators are affected by various adverse natural environments. In terms of electrical performance, insulators should be able to withstand transient switching overvoltages and lightning overvoltages, etc., to ensure no breakdown occurs; in terms of mechanical performance, insulators should not only bear the mechanical stress caused by their own weight such as conductors, but also bear the thermal stress and electrical stress caused by changes in the operating environment. Porcelain insulators, with the good chemical stability of their electroceramic materials, can withstand adverse environmental conditions, and have good heat resistance and anti-aging properties, and are widely used in transmission lines of various voltage levels in China.

[0003] Traditional detection methods for porcelain insulators include power frequency spark, power frequency withstand voltage, megger, distributed voltage (live working), spark fork (live working), etc., which have all been adopted in engineering. However, these detection methods all have their own deficiencies. Using a portable impulse voltage generator to generate high-voltage pulses and measuring the discharge waveform information has higher accuracy and rapid measurement. Its principle is to apply a high-voltage pulse of 50 - 60 KV across the insulator, which is aligned with the power frequency withstand voltage test, and the rising edge climbing rate is 1 KV / μs, and the falling edge depends on the first-order RC discharge circuit of the insulator. Due to the penetrating defects inside the zero-value insulator, internal breakdown will occur at the voltage rising edge, and a high-frequency breakdown current with a very large amplitude will be formed. While normal insulators will not have breakdown, and after the voltage across the insulator reaches the maximum value (the discharge of the primary-side capacitor ends), it discharges according to the first-order RC discharge circuit. As criteria, firstly, it is the amplitude of the charging voltage, which is a method that has been used, and secondly, it is the magnitude of the discharge current (acquisition of the charge quantity). Since insulators with different mechanical loads have different capacitances, and the surface conditions (such as contamination, moisture, etc.) will also affect the charging amplitude. In addition, through practical verification, the breakdown voltage amplitudes of some insulators with smaller defects are also quite high. Therefore, only using criterion one is likely to result in missed judgments and misjudgments.

[0004] It should be noted that the information disclosed in the above background art section is only for understanding the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] The main purpose of the present invention is to overcome the defects existing in the above-mentioned background technology and provide a method and device for rapid detection of zero value of porcelain insulator based on impulse current characteristics.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A method for quickly detecting zero value of a porcelain insulator based on impulse current characteristics comprises the following steps: Apply high voltage pulses to both ends of the porcelain insulator to be tested; Inducing the impulse current signal in the insulator loop through the magnetic ring, and converting the impulse current signal into an integrated voltage signal using an integration circuit; The integrated voltage signal is compared with a preset threshold value. If the integrated voltage signal is higher than the preset threshold value, the porcelain insulator is determined to be a zero-value insulator with an internal breakdown defect; wherein the preset threshold value is predetermined according to a given multiple of the integrated voltage measured by a normal insulator under the same conditions.

[0007] A porcelain insulator zero value rapid detection device based on impulse current characteristics, comprising: A high-voltage pulse generating circuit is used to generate high-voltage pulses and apply them to both ends of the porcelain insulator to be tested; A measuring circuit, comprising a magnetic ring induction unit, an integration circuit and a voltmeter, wherein the magnetic ring induction unit is used to collect a high-frequency breakdown current signal in the insulator circuit, the integration circuit is used to convert the breakdown current signal into an integrated voltage signal, and the voltmeter is used to measure the integrated voltage signal; A data processing module is connected to the voltmeter and is used to collect the integrated voltage signal and compare it with a preset threshold value. If the integrated voltage signal is higher than the preset threshold value, the porcelain insulator is determined to be a zero-value insulator with an internal breakdown defect; wherein the preset threshold value is predetermined according to a given multiple of the integrated voltage measured by a normal insulator under the same conditions; The present invention has the following beneficial effects: The present invention proposes a rapid zero-value detection scheme for porcelain insulators. By adopting the impact current characteristic detection technology, it overcomes the limitation of traditional porcelain insulator detection methods that rely on the charging voltage amplitude as the criterion, and proposes a new detection method and device based on the determination of the integral voltage of the impact current. The present invention applies a high-voltage pulse to both ends of the porcelain insulator to be tested, utilizes the high-frequency breakdown current signal in the magnetic ring induction loop, and combines an integral circuit to convert the impact current into an integral voltage signal. By comparing it with a preset threshold calibrated based on the experimental data of normal insulators, the risks of misjudgment and missed judgment caused by differences in the surface contamination, humidity, etc. of the insulator or different types of internal defects are significantly reduced. Compared with the defect that the traditional single voltage amplitude criterion is vulnerable to capacitance differences and surface state interference, the present invention realizes accurate determination through the significant difference in integral voltage (the integral voltage of a zero-value insulator can reach several times to dozens of times that of the normal value), effectively adapts to porcelain insulators with different mechanical load levels and complex external insulation conditions, greatly improves the detection reliability, and provides technical guarantee for the operation safety of grid insulators.

[0008] Other beneficial effects in the embodiments of the present invention will be further described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the overall flowchart of the rapid zero-value detection method for porcelain insulators based on the impact current characteristics of the present invention.

[0010] Figure 2 It is the structural schematic diagram of the high-voltage pulse detection device for porcelain insulators in the embodiment of the present invention.

[0011] Figure 3 It is the schematic diagram of the measurement circuit in the embodiment of the present invention.

[0012] Figure 4 It is the working flowchart in the embodiment of the present invention.

[0013] Figure 5 It is the voltage curve at the breakdown moment of a 420KN zero-value insulator in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following makes a detailed description of the embodiments of the present invention. It should be emphasized that the following description is merely exemplary and not intended to limit the scope of the present invention and its applications.

[0015] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be for fixing or for coupling or communicating.

[0016] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0018] At present, the pulse detection method for porcelain insulators generally takes the amplitude of the insulator charging voltage as the zero judgment standard. However, due to the different surface conditions and types of internal defects of the insulators, relying solely on the amplitude as the judgment criterion will result in missed judgments and misjudgments, causing safety hazards. The present invention proposes a porcelain insulator internal defect detection device that can collect impulse currents to achieve accurate detection of internal defects in porcelain insulators. The present invention can perform internal defect detection on porcelain insulators with different mechanical load levels under different external insulation states, effectively prevent power grid accidents caused by the zero value of porcelain insulators, and provide support for the safe operation of the power grid.

[0019] See also Figure 1 The embodiment of the present invention provides a method for quickly detecting the zero value of a porcelain insulator based on the impulse current characteristic, comprising the following steps: Apply high voltage pulses to both ends of the porcelain insulator to be tested; Inducing the impulse current signal in the insulator loop through the magnetic ring, and converting the impulse current signal into an integrated voltage signal using an integration circuit; The integrated voltage signal is compared with a preset threshold value. If the integrated voltage signal is higher than the preset threshold value, the porcelain insulator is determined to be a zero-value insulator with an internal breakdown defect; wherein the preset threshold value is predetermined according to a given multiple of the integrated voltage measured by a normal insulator under the same conditions.

[0020] The high-voltage pulse can be generated by controlling the charging and discharging process of the discharge capacitor through a transformer boost. The integrated voltage signal accumulates the charge corresponding to the breakdown current, so that the integrated voltage of the zero-value insulator and the normal insulator produce a significant difference, and the zero-value judgment is achieved through voltage comparison.

[0021] In some embodiments, the process of generating a high-voltage pulse includes: charging a discharge capacitor to a set voltage value; triggering a switching device to conduct, so that the discharge capacitor generates a high-voltage pulse through a transformer step-up.

[0022] In some embodiments, the process of converting an impact current signal includes: inducing a high-frequency breakdown current signal in a magnetic ring induction loop, and using an integrating circuit to accumulate the charge amount of the breakdown current; suppressing current oscillation by using a fast-recovery diode, so that the integrated voltage signal reflects the breakdown current characteristics; by adjusting the parameters of the integrating circuit, making the measurement process sensitive to the high-frequency breakdown current and insensitive to the low-frequency discharge current.

[0023] In some embodiments, the process of determining an internal breakdown defect includes: collecting the voltage signal of an integrating capacitor and comparing it with a preset threshold; if the integrated voltage signal is significantly higher than the threshold, it is determined that the insulator has an internal breakdown defect; using the difference in the integrated voltage of the breakdown current as a criterion to eliminate the interference of the surface state of the insulator on the detection result.

[0024] In some embodiments, the process of determining an internal breakdown defect includes: during the rising edge stage of the high-voltage pulse, monitoring the generation of the breakdown current and converting the breakdown current into an integrated voltage signal through an integrating circuit; converting the integrated voltage signal into a digital signal, and processing the digital signal to determine whether it exceeds a preset threshold, and outputting a detection result.

[0025] In some embodiments, the operation flow of the method includes: (1) After charging the discharge capacitor to a preset voltage, generating a high-voltage pulse and applying it to the insulator; (2) Inducing the loop current through a magnetic ring and converting it into an integrated voltage signal; (3) Based on the comparison result of the integrated voltage amplitude, determining whether the insulator is a zero-value insulator; (4) Outputting the detection result through an acoustic-optical prompt or a display screen to achieve fast interactive feedback.

[0026] Refer to Figure 2, a porcelain insulator zero-value rapid detection device based on impulse current characteristics, comprising: a high-voltage pulse generating circuit, used to generate a high-voltage pulse and apply it to both ends of the porcelain insulator to be tested; a measuring circuit, comprising a magnetic ring induction unit, an integration circuit and a voltmeter, the magnetic ring induction unit is used to collect a high-frequency breakdown current signal in the insulator circuit, the integration circuit is used to convert the breakdown current signal into an integrated voltage signal, and the voltmeter is used to measure the integrated voltage signal; a data processing module, connected to the voltmeter, is used to collect the integrated voltage signal and compare it with a preset threshold value, if the integrated voltage signal is higher than the preset threshold value, the porcelain insulator is determined to be a zero-value insulator with an internal breakdown defect; wherein the preset threshold value is predetermined according to a given multiple of the integrated voltage measured by a normal insulator under the same conditions.

[0027] The high-voltage pulse generating circuit can generate high-voltage pulses by controlling the charging and discharging of the discharge capacitor. The measuring circuit accumulates the charge corresponding to the breakdown current through the integrating capacitor, so that the integrated voltage of the zero-value insulator and the normal insulator differ. The data processing module outputs the detection result through voltage comparison.

[0028] See also Figure 2 In some embodiments, the high-voltage pulse generating circuit includes a discharge capacitor C1, a first switch device IGBT1, a second switch device IGBT2, a boost and control circuit, and a transformer T; by controlling the conduction timing of the first switch device IGBT1 and the second switch device IGBT2 located at the front end and the rear end of the boost and control circuit, the boost and control circuit boosts the power supply voltage to a set value and charges the discharge capacitor C1; the transformer T transfers the high-voltage pulse from the primary side to the secondary side and provides a high-voltage pulse for the insulator to be tested; the primary side and the secondary side of the transformer T are respectively connected with diodes, including a primary side diode D1 and a secondary side diode D2; the discharge energy of the discharge capacitor C1 is boosted by the secondary side of the transformer T to form a high-voltage pulse, which is applied to both ends of the insulator to be tested through the air gap formed by the two spherical electrodes. The amplitude and rising rate of the high-voltage pulse are adjustable to meet the breakdown threshold requirements of insulators with different mechanical load levels.

[0029] See also Figure 3 In some embodiments, the integration circuit includes an integration capacitor C2, a resistor R1 and a fast recovery diode D3 arranged in the measurement loop; the combination of the integration capacitor C2 and the resistor R1 realizes sensitive accumulation of high-frequency breakdown current (which can be caused by the impact current) and suppresses the low-frequency discharge current. The fast recovery diode D3 eliminates the current oscillation at the moment of breakdown (including the moment of breakdown caused by the impact current) to ensure the stability of the integrated voltage signal. The measurement loop measures the integrated voltage signal through a voltmeter V.

[0030] In some embodiments, the data processing module includes: an ADC acquisition unit for sampling and obtaining the voltage signal of the integration capacitor C2; a comparison unit for comparing the voltage signal with a preset threshold, and determining a zero-value insulator if the integration voltage is significantly higher than the threshold; and a result output unit for feeding back the detection result through an acoustic-optic prompt device or a display screen to achieve user interaction.

[0031] The specific embodiments of the present invention and experimental verification are further described below.

[0032] A method and device for rapid detection of zero value of porcelain insulators, and the structure of the detection device is as Figure 2 shown. The device includes a pulse generation circuit, a measurement circuit, and a data processing module (not shown).

[0033] During actual testing, the porcelain insulator can be applied to the high-voltage side. The discharge capacitor C1 discharges when the second switching device IGBT2 is turned on, and the energy is transferred to the secondary side through the transformer to charge the insulator to be tested. The loop current is extracted by the magnetic ring, and whether internal breakdown occurs is judged according to the charging voltage of the integration capacitor C2 in the measurement circuit.

[0034] The principle of this measurement circuit can be explained by a simple R / / C equivalent model of porcelain insulators. During the charging process of the porcelain insulator, after a normal insulator is charged to about 60 KV, due to the existence of the secondary-side diode D2, it discharges according to a first-order RC circuit; a zero-value insulator will have one or more breakdowns during the boosting process, resulting in one or more breakdown currents, which will be induced and collected by the magnetic ring to charge the integration capacitor C2, causing a significant difference in the integration voltage signal from that of a normal insulator. By controlling the size of the integration capacitor C2, the observability of the integration voltage signal is ensured; by adjusting the value of R1, the high-frequency current is more easily accumulated by the integration capacitor C2 and is insensitive to the low-frequency current, thereby fully reflecting the effect brought by the breakdown current. Under normal circumstances, the integration voltage signal of the zero-value insulator is much higher than that of the normal insulator.

[0035] The integration voltage signal collected by the voltmeter , after being sampled by the ADC, is compared with the set value to complete the determination. For example, after testing zero-value and normal insulators of different tonnages under the selected integration capacitor C2, it is found that the integration voltage signal shows the data as shown in Table 1. Based on the statistical results of the data in Table 1, it can be seen that for through defects, because the breakdown current is particularly large, the integration voltage signal The difference is obvious. A wide range from 0.1V to 0.6V can be used as the discrimination value. When m is smaller, it is more sensitive to the breakdown current and thus more sensitive to local defects. Here, m = 0.3V is taken as a compromise. When , it is determined as a zero-value insulator; when , it is determined as a normal insulator.

[0036] During the process of the voltage rising at both ends of the insulator, since the capacitances of the zero-value and normal insulators are not much different, the impulse currents generated due to the change of the insulator capacitive reactance during this process are also not much different. During this process, the charge flowing through the insulator is less; in addition, a breakdown current will be generated during the breakdown process of the zero-value insulator, which is the source of the difference in the integral voltage signal . The formula is as follows:

[0037] Since the amplitude and frequency of the breakdown current are extremely high, it is not convenient to sample directly with a transformer. Only a Rogowski coil can be used to collect its waveform. Therefore, this integration circuit is designed to reflect the existence of the breakdown current by the difference in the integral voltage signal . Due to the high-frequency characteristics of the breakdown current, the fast-recovery diode D3 prevents the current from oscillating at the moment of breakdown, affecting the discrimination of the integral voltage signal .

[0038] Taking the existence or non-existence of the breakdown current as the criterion for judgment is less affected by the surface state of the insulator. Even if the surface resistance is very small, since only whether internal breakdown occurs is concerned, no misjudgment will occur; for insulators with a maximum mechanical load of 550KN, when the outer surface is clean, it is ensured that the peak value of the pulse voltage can reach 60KV. As long as any insulator with any mechanical load level has internal breakdown, there will definitely be a breakdown current, so no missed judgment will occur.

[0039] The operation logic of the zero-value rapid detection device for porcelain insulators is as follows: Step 1: Charge the discharge capacitor C1. The power supply boosts the voltage of the discharge capacitor C1 to the set value through the boosting and control circuit.

[0040] Step 2: Discharge the discharge capacitor C1, and form a high-voltage pulse on the secondary side through transformer boosting. The first switching device IGBT1 and the second switching device IGBT2 are both controlled by the MCU. When the discharge capacitor C1 is charged to the set value, the MCU controls the second switching device IGBT2 to conduct and start discharging. The energy is transferred to the secondary side through the transformer to charge the insulator.

[0041] Step 3: Measure and judge. The magnetic ring senses the loop current and hands it over to the measurement loop for integral processing. The ADC samples the integral voltage signal , and makes a comparison and judgment. For example, at a selected specific value of the integral capacitor C2, Presents the data shown in Table 1. According to the test data in Table 1, the critical value m can be set to 0.3V. When , it is determined as a zero-value insulator; when , it is determined as a normal insulator. The result can be prompted through a display screen and sound, enhancing the simplicity of device use.

[0042] Figure 2 is a schematic structural diagram of the high-voltage pulse detection device for porcelain insulators according to an embodiment of the present invention. Figure 3 is the measurement circuit according to an embodiment of the present invention. Figure 4 Shows the working process of the device, including: Step S1: Test preparation. Connect the insulator to the high-voltage end. Step S2: Detection. Press the detection button, and the MCU automatically charges the discharge capacitor C1 to the set value and then discharges it to form a high-voltage pulse on the secondary side. Step S3: Output result. The detection circuit collects the current information during the pulse process, compares and judges. The detection result is prompted through a display screen and sound.

[0043] Figure 5 is the breakdown moment voltage curve of a non-standard zero-value insulator 420KN-3. Its impulse voltage peak is higher than 55KV and it breaks down at the falling edge. If a single voltage amplitude is used as the criterion, it may be misjudged as a normal insulator. The embodiment of the present invention is based on the impulse current characteristics, and by detecting the integral voltage signal of the breakdown current generated by the insulator under the action of a high-voltage pulse and comparing it with a preset threshold, it effectively avoids misjudgment and missed judgment caused by different surface states or internal defect types of the insulator, thereby realizing the accurate determination of normal insulators and zero-value insulators.

[0044] Table 1 shows the comparison of the integral voltage signals of zero-value and normal insulators differences.

[0045] Table 1 of the insulator measured data

[0046] It can be seen that generally, for zero-value and normal insulators, the difference in the integral voltage signal can reach more than 10 times. This huge gap reflects the superiority of the criterion used in the present invention.

[0047] In summary, the present invention proposes a method and device for rapid zero-value detection of porcelain insulators based on impulse current characteristics, and designs a high-voltage pulse detection circuit for porcelain insulators and a new zero-value judgment method. Through the measurement circuit of the current integration method, the breakdown current of the zero-value insulator, which is different from that of the normal insulator, is highlighted, and the integrated voltage is used as the zero-value judgment standard. Thus, the possibility of missed judgment is greatly reduced. Compared with the traditional method of judging by the amplitude of the impulse voltage, the present invention is more adaptable to insulators with different mechanical load levels and complex external surface insulation conditions. Based on the acquisition of impulse current and zero-value discrimination, and detecting the through defects existing inside the porcelain insulator, the present invention can accurately detect the long-term operation process and factory defects of the porcelain insulator, and effectively improve the reliability of the insulator operation.

[0048] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several alternatives or modifications can be made to these described embodiments, and these alternative or modified forms should all be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of protection of the patent application.

Claims

1. A method for rapid detection of zero value of porcelain insulator based on impulse current characteristics, characterized in that: The following steps are involved: Apply high voltage pulses to both ends of the porcelain insulator to be tested; Inducing the impulse current signal in the insulator loop through the magnetic ring, and converting the impulse current signal into an integrated voltage signal using an integration circuit; The integrated voltage signal is compared with a preset threshold value. If the integrated voltage signal is higher than the preset threshold value, the porcelain insulator is determined to be a zero-value insulator with an internal breakdown defect; wherein the preset threshold value is predetermined according to a given multiple of the integrated voltage measured by a normal insulator under the same conditions.

2. The method for rapid detection of zero value of porcelain insulator based on impulse current characteristics according to claim 1, characterized in that: The process of generating high-voltage pulses includes: charging the discharge capacitor to a set voltage value; triggering the switch device to turn on, so that the discharge capacitor is boosted by the transformer to generate a high-voltage pulse with a set amplitude and rising rate.

3. The method for rapid detection of zero value of porcelain insulator based on impulse current characteristics according to claim 1, characterized in that: The process of converting the impulse current signal includes: A high-frequency breakdown current signal in the magnetic ring induction loop is sensed, and the charge amount of the breakdown current is accumulated by using an integration circuit; The current oscillation is suppressed by the fast recovery diode so that the integrated voltage signal reflects the breakdown current characteristics; The parameters of the integration circuit are configured so that the measurement process is sensitive to high-frequency breakdown currents but insensitive to low-frequency discharge currents.

4. The method for rapid detection of zero value of porcelain insulator based on impulse current characteristics according to claim 1, characterized in that: The process of determining internal breakdown defects includes: During the rising edge of the high voltage pulse, the generation of breakdown current is monitored, and the breakdown current is converted into an integrated voltage signal through an integration circuit; The integrated voltage signal is converted into a digital signal, and the digital signal is processed to determine whether it exceeds a preset threshold, and a detection result is output.

5. The method for rapid detection of zero value of porcelain insulator based on impulse current characteristics according to any one of claims 1 to 4, characterized in that: The operation process of the method includes: (1) After charging the discharge capacitor to a preset voltage, a high voltage pulse is generated and applied to the insulator; (2) The loop current is sensed by the magnetic ring and converted into an integrated voltage signal; (3) Based on the comparison result of the integrated voltage amplitude, determine whether the insulator is a zero-value insulator; (4) Output the test results through sound and light prompts or display screens to achieve rapid interactive feedback.

6. A porcelain insulator zero value rapid detection device based on impulse current characteristics, characterized in that: include: A high-voltage pulse generating circuit is used to generate high-voltage pulses and apply them to both ends of the porcelain insulator to be tested; A measuring circuit, comprising a magnetic ring induction unit, an integration circuit and a voltmeter, wherein the magnetic ring induction unit is used to collect a high-frequency breakdown current signal in the insulator circuit, the integration circuit is used to convert the breakdown current signal into an integrated voltage signal, and the voltmeter is used to measure the integrated voltage signal; A data processing module is connected to the voltmeter and is used to collect an integrated voltage signal and compare it with a preset threshold. If the integrated voltage signal is higher than the preset threshold, the porcelain insulator is determined to be a zero-value insulator with an internal breakdown defect; wherein the preset threshold is predetermined according to a given multiple of the integrated voltage measured by a normal insulator under the same conditions.

7. The porcelain insulator zero value rapid detection device according to claim 6 is characterized in that: The high-voltage pulse generating circuit includes a discharge capacitor, a switch device, a boost and control circuit, and a transformer; By controlling the conduction timing of the switch device, the boost and control circuit boosts the power supply voltage to a set value and charges the discharge capacitor; The transformer transmits the high voltage pulse from the primary side to the secondary side and provides the high voltage pulse for the insulator to be tested; The discharge energy of the discharge capacitor is boosted by the secondary side of the transformer to form a high-voltage pulse, which is applied to both ends of the insulator to be tested.

8. The porcelain insulator zero value rapid detection device according to claim 6 or 7, characterized in that: The integration circuit includes an integration capacitor, a resistor and a fast recovery diode arranged in the measurement loop; The combination of the integral capacitor and the resistor realizes sensitive accumulation of high-frequency breakdown current and suppresses low-frequency discharge current. The fast recovery diode eliminates current oscillation at the moment of breakdown and ensures the stability of the integral voltage signal.

9. The porcelain insulator zero value rapid detection device according to claim 6 or 7, characterized in that: The data processing module comprises: ADC acquisition unit, used for sampling and obtaining the voltage signal of the integration capacitor; A comparison unit, which compares the voltage signal with a preset threshold value, and determines that the insulator is a zero value insulator if the integrated voltage is significantly higher than the threshold value; The result output unit feeds back the test results through an audio-visual prompt device or a display screen to achieve user interaction.

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