CN116893371A - Method for testing leakage current of field GIS basin-type insulator under temperature gradient - Google Patents
Method for testing leakage current of field GIS basin-type insulator under temperature gradient Download PDFInfo
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Abstract
The invention discloses a method for testing leakage current under a temperature gradient of a field GIS basin-type insulator, which comprises the steps of firstly fixing the basin-type insulator with a metal flange, fixing the basin-type insulator in a GIS pipeline by using a fixing bolt, connecting the fixing bolt with a ground end through a signal shielding wire, leading out a measurement output wire and an electrometer from a partial discharge detection port reserved for the basin-type insulator to form a transmission channel, obtaining currents under different voltages through changing a high-voltage direct-current power supply and applying voltages of a high-voltage sleeve, obtaining the leakage current of the basin-type insulator under different temperatures through designing a matched basin-type insulator external heating device, and processing the signals by adopting an improved filtering algorithm at an upper computer end to obtain the final leakage current in consideration of smaller leakage current signals.
Description
Technical Field
The invention belongs to the field of leakage current detection of GIS basin-type insulator equipment, and particularly relates to a method for testing leakage current under a temperature gradient of a field GIS basin-type insulator.
Background
The gas-sealed switch (GIS, gas insulated switchgear) is used as a main carrier of the power transmission technology and is used for carrying the tasks of power production, power transmission and urban power supply systems. In the actual operation process, the operation stability of the GIS is related to a plurality of insulating structural members, such as a high-voltage isolating switch, a gas-insulated metal shell, a basin-type insulator and the like, the basin-type insulator is used as an important structural member in GIS equipment, not only is air and insulating gas isolated to prevent the insulating gas from reducing the insulating performance due to pollution, but also is required to inhibit the internal discharge of the equipment, is used as a supporting member of a conductive structure under high field intensity and bears the vibration and impact function in the operation process, and plays an irreplaceable role in the safe and stable operation process of the GIS, so that the reliable operation and effective insulating performance of the basin-type insulator are very important.
In the prior art, the prior research focuses on means such as ultrahigh frequency partial discharge, dielectric properties, optical tracking and the like, but the means more or less need to detach the basin-type insulator or a detection signal cannot describe the actual insulation characteristic of the basin-type insulator, so the invention focuses on a detection method adopting non-detached basin-type insulator leakage current to fill the defects of the prior detection means.
Leakage current is a key parameter in evaluating insulation performance as an insulating material. The operational reliability of the current equipment and the insulation performance of the insulation material can be reflected by effective measurement of the leakage current of the insulation material or the insulation device. The leakage current generally comprises the conduction current of an insulating medium and the displacement current generated by a capacitive component, and is mainly the conduction current in a low-frequency signal, besides the signal component, the measured leakage current also needs to be considered as a bulk current or a surface current in the actual measurement process, and the general surface leakage current is a dynamic parameter in the aspect that the surface of the insulating material is polluted, and is characterized by the total amount of ions or electrons in the material crossing traps or barriers in the migration process, so that the device or the internal performance parameter of the insulating material can be directly reflected, and a feasible scheme is provided for the experimental method introduced herein in the aspect of testing the bulk leakage current of the basin-type insulator.
From the assembly mode and the operation characteristics of the basin-type insulator, a feasible wiring mode needs to be constructed to meet the theoretical requirements of three-electrode wiring, leakage current on the surface of the basin-type insulator is eliminated through grounding, leakage current signals are small and are at pA level and nA level, interference of detection environments is easy to occur, therefore, disturbance signals and high-frequency clutter which occur in the acquisition process need to be filtered, at present, existing filtering means mostly adopt hardware filtering, a filter is arranged at a terminal of the acquisition equipment, signals are cleaned through a filtering circuit, but the algorithm filtering is needed to be considered to be carried out by considering a signal source for superposition of effective signals and noise signals, the stable stage of the leakage current needs to be positioned, the stable time of the conduction current needs to be considered, different data intervals need to be selected according to different materials, the current signals which are about 10min to be used as test signals need to be detected for the basin-type insulator need to be different in terms of the environment temperature of the different detection leakage current, and the physical temperature of the basin-type insulator needs to be effectively controlled for the same variable.
Disclosure of Invention
In view of the above problems and defects in the prior art, the present invention aims to provide a method for testing leakage current under a temperature gradient of a field GIS basin-type insulator, so as to solve the technical problem that the existing method is difficult to realize the measurement of the leakage current under the temperature gradient of the basin-type insulator under the service state.
The invention aims at realizing the following technical scheme:
the method for testing leakage current under the temperature gradient of the field GIS basin-type insulator comprises the steps of firstly fixing the basin-type insulator with a metal flange, fixing the basin-type insulator in a GIS pipeline by using a fixing bolt, connecting the fixing bolt with the ground through a signal shielding wire, leading out a measurement output line and an electrometer from a partial discharge detection port reserved for the basin-type insulator to form a transmission channel, obtaining currents under different voltages by changing the applied voltage of a high-voltage direct-current power supply through a high-voltage sleeve, obtaining the leakage current of the basin-type insulator under different temperatures by designing a matched basin-type insulator external heating device, and processing the signal by adopting an improved filtering algorithm at an upper computer end to obtain the final leakage current, wherein the main steps in the testing process comprise the following parts:
1) Applying voltage to the high-voltage end of the GIS through a high-voltage sleeve by adopting a high-voltage direct current source, and taking the high-voltage end as an unprotected electrode, namely a high-voltage electrode, in a leakage current three-electrode test system;
2) The GIS shell is reliably grounded, the surface of the basin-type insulator is grounded through a fixed bolt, surface current is led into a ground wire, the interference of a measurement result is avoided, and a protection electrode in a leakage current three-electrode test system is constructed;
3) The GIS basin-type insulator is provided with a partial discharge detection port in a reserved manner in the mounting process, a grounding wire is led out through the partial discharge detection port, an electrostatic meter is used in the partial discharge detection port in series, the partial discharge detection port is used as a protective electrode end of a leakage current three-electrode test system, and a site wiring method for completing the three-electrode test system is constructed;
4) The matched heating device is designed to be fixed on the outer side of the basin-type insulator by adopting a spring buckle, and the temperature is adjusted by a heating temperature controller;
5) The signal end of the low-noise triaxial cable of the electrometer is connected to the outgoing line of the partial discharge detection port, and the other two signal shielding ends are clamped on the grounding line;
6) Setting a test voltage by a high-voltage direct current source after the test is started, and starting data acquisition by an electrometer and an upper computer terminal at the same time of the test, and outputting the data through an RS-232 shielding wire or outputting the data by adopting a DB-9 signal wire;
7) Considering that the leakage current signal is smaller and electromagnetic interference influence of a test environment exists, clutter is removed at an upper computer end by adopting an improved filtering algorithm;
8) In order to obtain leakage currents at different temperatures, the reliable heating can be performed for 20min by changing the temperature of the heating device after the current test is completed, and the next measurement is performed to repeat the operations of the step 6) and the step 7).
The step 2) specifically comprises the following steps:
the fixing bolts of the GIS basin-type insulator sequentially form a conductive loop through the outer wall of the GIS pipeline and the surface of the edge fixing point of the basin-type insulator;
after the installation of the conductive loop is completed, the fixing bolt is further connected with the ground through the signal shielding wire to form a reliable shielding loop.
The step 3) is specifically as follows:
the signal shielding wire is directly connected with the fixing bolt, reliable grounding is needed in the testing process, the surface of the GIS basin-type insulator is ensured to be connected with the ground through the fixing bolt, and surface leakage current is eliminated;
a grounding wire directly connected with the electrometer can be led out from a reserved partial discharge detection port of the basin-type insulator, and the grounding wire forms a conducting loop through the electrometer in series to detect leakage current of the basin-type insulator;
the step 4) is specifically as follows:
the edge of the basin-shaped insulator is of an arc-shaped structure, an arc-shaped peripheral external heating device is designed, and the edge length of the basin-shaped insulator is matched;
the external heating device is installed and fixed through a retractable spring buckle to realize uniform heating of the basin-type insulator, and provides an adjustable heating temperature of 0-150 ℃, and the unit heating power is 0.4W/cm 2 。
The step 5) specifically comprises the following steps:
the signal receiving end of the low-noise triaxial cable needs to lead out a port capable of clamping from the partial discharge detection port of the GIS basin-type insulator to realize the wiring of the acquisition end;
considering that the partial discharge detection port of the basin-type insulator is not easy to lead out a detection line, conductive silicone oil is smeared at the partial discharge detection port, and a double-sided conductive copper tape is fixed at the partial discharge detection port to serve as a wiring terminal.
The clutter processing concrete mode of the upper computer terminal collecting data and the filtering algorithm is as follows:
the labview imaging programming language is used for forming an upper computer data acquisition system, a modularized structure is adopted for the detection and clutter processing system, filtering processing is carried out after gradient temperature leakage current data are collected in a concentrated mode, the efficiency of collecting gradient leakage current of the basin-type insulators for a single time can be improved, and the integrated data acquisition and filtering processing system can be used for intuitively obtaining leakage current of the basin-type insulators when field test requirements of small-batch basin-type insulators are met.
The method is characterized in that the method is researched and expanded in the aspect of testing the leakage current of the basin-type insulator, the three-electrode test wiring of a laboratory is expanded to be in field practice based on the wiring method provided by the invention, the leakage current measuring method of the basin-type insulator is established, the basin-type insulator leakage current test of the external heating device at different temperatures is designed according to the structure of the basin-type insulator body, the gradient current test of the basin-type insulator at different voltages can be realized by changing the output voltage of a high-voltage direct-current source in the process, the filtering of hardware can be realized by considering the built-in filtering system of the electrometer and the adopted low-noise triaxial cable in the aspect of coping with electromagnetic interference, and therefore, the stray waveforms and the interference of the acquired signals are filtered by adopting an improved filtering algorithm, so that the accuracy and the effectiveness of the test result are improved.
The invention has the following technical effects:
the invention relates to a method for testing leakage current under a temperature gradient of a field GIS basin-type insulator, which comprises a high-voltage direct-current source, an electrometer, an external heating device and an upper computer data acquisition system, and realizes the field measurement of the leakage current of the basin-type insulator in service by an effective three-electrode wiring method. The utility model provides a test method of leakage current under on-the-spot GIS basin-type insulator temperature gradient is a novel test means that realizes the non-dismantlement formula nondestructive detection leakage current of basin-type insulator, can directly measure current basin-type insulator inside the GIS pipeline to set up external heating device and heat basin-type insulator outer insulating layer, obtain basin-type insulator temperature gradient under leakage current numerical system, be convenient for analyze the insulating state of service basin-type insulator, provide data support for equipment change and maintenance, the visual interface that upper computer terminal provided also is convenient for the inspector directly to obtain leakage current's regularity curve.
Considering that the leakage current of the insulating material is at pA level or nA level and is easy to be influenced by disturbance signals such as electromagnetic interference in detection environment, the low-noise triaxial cable is used as a detection line of a protection electrode end in the test process, so that signal interference in the process of collecting signals by the basin-type insulator to the electrometer can be effectively reduced, part of high-order noise can be filtered through hardware filtering embedded in the electrometer, and an improved filtering algorithm is adopted at an upper computer end to carry out terminal processing, so that good waveform signals can be obtained.
On the other hand, the practical basin-type insulator facing the application method may have the difference of design specification parameters on site, but the adopted wiring method and test principle can be popularized and used, and are limited by the diversity of the current basin-type insulator, the external heating device needs to be designed according to the external insulation surface parameters of the practical basin-type insulator to be tested, and parameter correction is carried out according to the thermal conductivity and the radial thickness of the external heating device, and the adopted fixing mode of the retractable spring hasp can effectively lead the heating device to be in good contact with the basin-type insulator, and no heating missing area exists, so that the basin-type insulator can be heated uniformly.
In the data acquisition part, the actually-operated basin-type insulator has surface damage or pollution in the operation period, so that the leakage current test result is not reliable, and therefore, the engineering application value of the test result can be improved by establishing a leakage current database of the damage, pollution and fault basin-type insulator in a laboratory, and comparing the average value condition of the leakage current test of the basin-type insulator in the service process with the value of the leakage current development and stability area of the database through insulation diagnosis for multiple times.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art.
FIG. 1 is a diagram of an application wiring diagram in an embodiment of the present invention;
FIG. 2 is a flow chart of a method for testing leakage current under a temperature gradient of a field GIS basin-type insulator in an embodiment of the present invention;
in fig. 1, 1 is a high-voltage direct-current power supply, 2 is a high-voltage sleeve, 3 is a basin-type insulator, 4 is an external heating device, 5 is a signal shielding wire, 6 is a partial discharge detection port, 7 is an electrometer, 8 is an upper computer, and 9 is a fixing bolt.
Description of the embodiments
The technical scheme of the present invention is further described below with reference to the accompanying drawings, but is not limited to the described parts, and all modifications and equivalent substitutions of the technical scheme of the present invention are included in the protection scope of the present invention without departing from the spirit and scope of the technical scheme of the present invention.
The method for testing leakage current under the temperature gradient of the field GIS basin-type insulator comprises the steps of firstly fixing the basin-type insulator 3 with a metal flange, fixing the basin-type insulator inside a GIS pipeline by using a fixing bolt 9, connecting the fixing bolt 9 with the ground end through a signal shielding wire 5, leading out a measurement output line from a partial discharge detection port 6 reserved in the basin-type insulator 3 to form a transmission channel with an electrometer 7, obtaining currents under different voltages by changing the applied voltage of a high-voltage direct-current power supply 1 through a high-voltage sleeve 2, obtaining the leakage current of the basin-type insulator under different temperatures by designing a matched basin-type insulator external heating device 4, and processing the signals at an upper computer 8 by adopting an improved filtering algorithm to obtain the final leakage current in consideration of smaller leakage current signals, wherein the main steps in the testing process comprise the following parts:
1) The high-voltage end of the GIS adopts a high-voltage direct current source 1 to apply voltage through a high-voltage sleeve 2 to serve as an unprotected electrode, namely a high-voltage electrode, in a leakage current three-electrode test system;
2) The GIS shell is reliably grounded, the surface of the basin-type insulator 3 is grounded through a fixing bolt 9, surface current is led into a ground wire, the interference of a measurement result is avoided, and a protection electrode in a leakage current three-electrode test system is constructed;
3) The GIS basin-type insulator is provided with a partial discharge detection port 6 in a reserved manner in the mounting process, a grounding wire is led out through the partial discharge detection port 6, a used electrometer 7 is connected in series, the partial discharge detection port 6 is used as a protective electrode terminal of a leakage current three-electrode test system, and a site wiring method for completing the three-electrode test system is constructed;
4) The matched heating device is designed to be fixed on the outer side of the basin-type insulator 3 by adopting a spring buckle, and the temperature is adjusted by a heating temperature controller;
5) The signal end of the low-noise triaxial cable of the electrometer 7 is connected to the outgoing line of the partial discharge detection port 6, and the other two signal shielding ends are clamped on the grounding line;
6) After the test is started, the high-voltage direct-current source 1 sets a test voltage, and the electrometer 7 and the upper computer 8 end start data acquisition at the same time of the test, and output the data through an RS-232 shielding wire or output the data through a DB-9 signal wire;
7) Considering that the leakage current signal is smaller and electromagnetic interference influence of a test environment exists, clutter is removed at the 8 end of the upper computer by adopting an improved filtering algorithm;
8) In order to obtain leakage currents at different temperatures, the reliable heating can be performed for 20min by changing the temperature of the heating device after the current test is completed, and the next measurement is performed to repeat the operations of the step 6) and the step 7).
The step 2) specifically comprises the following steps:
the fixing bolts 9 of the GIS basin-type insulator 3 sequentially form a conductive loop through the outer wall of the GIS pipeline and the surface of the edge fixing point of the basin-type insulator 3;
after the installation of the conductive loop, the fixing bolt 9 is further connected with the ground through the signal shielding wire 5 to form a reliable shielding loop.
The step 3) is specifically as follows:
the signal shielding wire 5 is directly connected with the fixing bolt 9, reliable grounding is needed in the testing process, the surface of the GIS basin-type insulator is ensured to be connected with the ground through the fixing bolt 9, and surface leakage current is eliminated;
a grounding wire directly connected with the electrometer 7 can be led out from the reserved partial discharge detection port 6 of the basin-type insulator 3, and the grounding wire forms a conducting loop through the electrometer 7 in series to detect leakage current of the basin-type insulator 3;
the step 4) is specifically as follows:
the edge of the basin-type insulator 3 is of an arc-shaped structure, an arc-shaped circumference type external heating device 4 is designed, and the edge length of the basin-type insulator 3 is matched;
the external heating device 4 is installed and fixed, the basin-type insulator 3 is uniformly heated through the retractable spring buckle, the heating temperature of 0-150 ℃ can be adjusted, and the unit heating power is 0.4W/cm < 2 >.
The step 5) specifically comprises the following steps:
the signal receiving end of the low-noise triaxial cable needs to lead out a port capable of clamping from the partial discharge detection port 6 of the GIS basin-type insulator 3 to realize the wiring of the acquisition end;
considering that the partial discharge detection port 6 of the basin-type insulator 3 is not easy to lead out a detection line, conductive silicone oil is smeared at the partial discharge detection port 6, and a double-sided conductive copper tape is fixed at the partial discharge detection port 6 to serve as a wiring terminal.
The clutter processing concrete mode of the upper computer terminal collecting data and the filtering algorithm is as follows:
the labview imaging programming language is used for forming an upper computer data acquisition system, a modularized structure is adopted for the detection and clutter processing system, filtering processing is carried out after gradient temperature leakage current data are collected in a concentrated mode, the efficiency of collecting gradient leakage current of the basin-type insulators for a single time can be improved, and the integrated data acquisition and filtering processing system can be used for intuitively obtaining leakage current of the basin-type insulators when field test requirements of small-batch basin-type insulators are met.
The method is characterized in that the method is researched and expanded in the aspect of testing the leakage current of the basin-type insulator, the three-electrode test wiring of a laboratory is expanded to be in field practice based on the wiring method provided by the invention, the leakage current measuring method of the basin-type insulator is established, the basin-type insulator leakage current test of the external heating device at different temperatures is designed according to the structure of the basin-type insulator body, the gradient current test of the basin-type insulator at different voltages can be realized by changing the output voltage of a high-voltage direct-current source in the process, the filtering of hardware can be realized by considering the built-in filtering system of the electrometer and the adopted low-noise triaxial cable in the aspect of coping with electromagnetic interference, and therefore, the stray waveforms and the interference of the acquired signals are filtered by adopting an improved filtering algorithm, so that the accuracy and the effectiveness of the test result are improved.
Claims (7)
1. The invention discloses a method for testing leakage current under a temperature gradient of a field GIS basin-type insulator, which comprises the steps of firstly fixing the basin-type insulator with a metal flange, fixing the basin-type insulator in a GIS pipeline by using a fixing bolt, connecting the fixing bolt with a ground terminal through a signal shielding wire, leading out a measurement output line and an electrometer from a partial discharge detection port reserved for the basin-type insulator to form a transmission channel, obtaining currents under different voltages by changing a high-voltage direct-current power supply through the applied voltage of a high-voltage sleeve, obtaining the leakage current of the basin-type insulator under different temperatures by designing a matched basin-type insulator external heating device, and processing the signal by adopting an improved filtering algorithm at an upper computer terminal to obtain the final leakage current, wherein the method mainly comprises the following steps:
1) Applying voltage to the high-voltage end of the GIS through a high-voltage sleeve by adopting a high-voltage direct current source, and taking the high-voltage end as an unprotected electrode, namely a high-voltage electrode, in a leakage current three-electrode test system;
2) The GIS shell is reliably grounded, the surface of the basin-type insulator is grounded through a fixed bolt, surface current is led into a ground wire, the interference of a measurement result is avoided, and a protection electrode in a leakage current three-electrode test system is constructed;
3) The GIS basin-type insulator is provided with a partial discharge detection port in a reserved manner in the mounting process, a grounding wire is led out through the partial discharge detection port, an electrostatic meter is used in the partial discharge detection port in series, the partial discharge detection port is used as a protective electrode end of a leakage current three-electrode test system, and a site wiring method for completing the three-electrode test system is constructed;
4) The matched heating device is designed to be fixed on the outer side of the basin-type insulator by adopting a spring buckle, and the temperature is adjusted by a heating temperature controller;
5) The signal end of the low-noise triaxial cable of the electrometer is connected to the outgoing line of the partial discharge detection port, and the other two signal shielding ends are clamped on the grounding line;
6) Setting a test voltage by a high-voltage direct current source after the test is started, and starting data acquisition by an electrometer and an upper computer terminal at the same time of the test, and outputting the data through an RS-232 shielding wire or outputting the data by adopting a DB-9 signal wire;
7) Considering that the leakage current signal is smaller and electromagnetic interference influence of a test environment exists, clutter is removed at an upper computer end by adopting an improved filtering algorithm;
8) In order to obtain leakage currents at different temperatures, the reliable heating can be performed for 20min by changing the temperature of the heating device after the current test is completed, and the next measurement is performed to repeat the operations of the step 6) and the step 7).
2. The method for testing leakage current under the temperature gradient of the field GIS basin-type insulator according to claim 1, wherein the step 2) is specifically as follows: the fixing bolts (9) of the GIS basin-type insulator (3) sequentially form a conductive loop through the surfaces of the outer wall of the GIS pipeline and the edge fixing points of the basin-type insulator (3); after the conductive loop is installed, the fixing bolt (9) is further connected with the ground through the signal shielding wire (5) to form a reliable shielding loop.
3. The method for testing leakage current under the temperature gradient of the field GIS basin-type insulator according to claim 1, wherein the step 3) is specifically as follows: the signal shielding wire (5) is directly connected with the fixing bolt (9), reliable grounding is needed in the testing process, the surface of the GIS basin-type insulator (3) is ensured to be connected with the ground through the fixing bolt (9), and surface leakage current is eliminated; the reserved partial discharge detection port (6) of the basin-type insulator (3) can be led out of a grounding wire directly connected with the electrometer (7), and the grounding wire forms a conducting loop through the electrometer (7) in series to detect leakage current of the basin-type insulator (3).
4. The method for testing leakage current under the temperature gradient of the field GIS basin-type insulator according to claim 1, wherein the step 4) is specifically as follows: the edge of the basin-shaped insulator (3) is of an arc-shaped structure, an arc-shaped circumferential external heating device (4) is designed, and the edge length of the basin-shaped insulator (3) is matched; the external heating device (4) is installed and fixed to uniformly heat the basin-type insulator (3) through a retractable spring buckle, and provides an adjustable heating temperature of 0-150 ℃, and the unit heating power is 0.4W/cm 2 。
5. The method for testing leakage current under the temperature gradient of the field GIS basin-type insulator according to claim 1, wherein the step 5) is specifically as follows: the signal receiving end of the low-noise triaxial cable needs to lead out a port capable of clamping from the partial discharge detection port of the GIS basin-type insulator (3) to realize wiring of the acquisition end; considering that the partial discharge detection port of the partial basin-type insulator (3) is not easy to lead out a detection line, conductive silicone oil is smeared at the partial discharge detection port, and a double-sided conductive copper tape is fixed at the partial discharge detection port to serve as a wiring terminal.
6. The method for testing leakage current under the temperature gradient of the field GIS basin-type insulator according to claim 1, wherein the method comprises the following specific steps of data acquisition at the upper computer end and clutter processing of a filtering algorithm: the labview imaging programming language is used for forming an upper computer data acquisition system, a modularized structure is adopted for the detection and clutter processing system, filtering processing is carried out after gradient temperature leakage current data are collected in a concentrated mode, the efficiency of collecting gradient leakage current of the basin-type insulators for a single time can be improved, and the integrated data acquisition and filtering processing system can be used for intuitively obtaining leakage current of the basin-type insulators when field test requirements of small-batch basin-type insulators are met.
7. The method for testing the leakage current of the basin-type insulator (3) under the temperature gradient of the field GIS is characterized in that the insulation detection means of the basin-type insulator (3) are limited to local discharge signals and detached basin-type insulator (3) bodies at the present stage, effective measurement under actual working conditions or field service states cannot be achieved, the disassembly process can produce a latent influence on system stability, the measurement method is researched and expanded in the aspect of testing the leakage current of the basin-type insulator (3) bodies, a three-electrode test wiring of a laboratory is expanded to be practical on the spot based on the wiring method provided by the method, the leakage current measurement method of the basin-type insulator (3) is established, the basin-type insulator (3) leakage current test under different temperatures is achieved according to the basin-type insulator (3) body structure, the gradient current test of the basin-type insulator under different voltages can be achieved by changing the output voltage of a high-voltage direct current source in the process, the built-in filter system and the low-coaxial noise three-cable adopted in the electromagnetism interference aspect is considered, therefore the improved algorithm for testing the noise waveform and the noise waveform of the noise waveform can be effectively tested, and the noise waveform can be effectively acquired.
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| CN117890825A (en) * | 2024-03-15 | 2024-04-16 | 深圳永贵技术有限公司 | Leakage current testing method, device and equipment of charging gun and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117890825A (en) * | 2024-03-15 | 2024-04-16 | 深圳永贵技术有限公司 | Leakage current testing method, device and equipment of charging gun and storage medium |
| CN117890825B (en) * | 2024-03-15 | 2024-05-14 | 深圳永贵技术有限公司 | Leakage current testing method, device and equipment of charging gun and storage medium |
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