CN108957379B - On-site calibration method for GIS partial discharge ultrahigh frequency detection equipment - Google Patents
On-site calibration method for GIS partial discharge ultrahigh frequency detection equipment Download PDFInfo
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Abstract
The invention relates to a GIS partial discharge ultrahigh frequency detection equipment field calibration method, which is technically characterized in that: the method comprises the following steps: step 1, building a GIS ultrahigh frequency detection equipment field calibration platform which can be used in a test field; step 2, bringing the GIS ultrahigh frequency detection equipment field calibration platform to a GTEM platform in a fully shielded laboratory for calibration and comparison; and 3, when the detection personnel calibrate the GIS partial discharge ultrahigh frequency detection equipment in the test site, the detection personnel turn on a site calibration pulse source, place the ultrahigh frequency sensor in the measurement area in the aluminum box and externally connect the ultrahigh frequency detection equipment host, and calibrate the basic condition of the detection equipment by adopting an indirect calibration mode. The calibration method provided by the invention is simple to operate and strong in performability, and the calibration platform built under the method is simple in structure, low in cost and convenient to carry, so that the use efficiency of the detection equipment is greatly improved, and the effectiveness of the measurement result is ensured.
Description
Technical Field
The invention belongs to the technical field of on-line monitoring of power equipment, relates to a field calibration method of the power equipment, and particularly relates to a field calibration method of GIS partial discharge ultrahigh frequency detection equipment.
Background
GIS equipment is one of common power equipment, and GIS with insulation defect often produces the partial discharge phenomenon in service, the corresponding ultrahigh frequency electromagnetic wave signal that produces, this signal propagates along the GIS cavity to through this position gap radiation to the GIS outside at disc insulator department. Therefore, the detection personnel can use the ultrahigh frequency detection equipment to analyze and detect the partial discharge condition in the detected GIS
With the widespread development of GIS partial discharge detection, grid companies in various regions are equipped with a large number of GIS partial discharge ultrahigh frequency detection devices, which are manufactured by different manufacturers, and the aging degrees of detection circuits and devices are different, so that detection personnel often cannot know the basic conditions of the detection devices exactly when performing field detection, such as sensitivity, linear error and stability, and even in the face of detection results with large differences among different devices, which device detection result cannot be analyzed qualitatively, and the device conditions can be analyzed usually in a calibration mode.
The method is characterized in that a direct calibration mode is adopted in the existing GIS partial discharge ultrahigh frequency detection equipment, the calibration mode is carried out on a GTEM platform in a full-shielding laboratory, a signal generator is adopted as a calibration pulse source to simulate a partial discharge ultrahigh frequency signal, the signal is transmitted to a reference sensor of a GTEM cell through a high-frequency cable to send an ultrahigh frequency electromagnetic wave signal, a tester places the ultrahigh frequency detection equipment at a specific position to detect the electromagnetic wave signal value, and compares the electromagnetic wave signal value with the set amplitude value of the signal generator to carry out calibration analysis, and in addition, the ultrahigh frequency sensor of the detection equipment can be connected to a high-speed oscilloscope and a measurement and control computer to carry out tests such as the average effective height of.
The detailed condition of the ultrahigh frequency detection equipment can be analyzed quantitatively by the direct calibration method, but the method has the following defects for basic users and maintainers of the ultrahigh frequency detection equipment:
the direct calibration mode needs to be equipped with a professional laboratory, the construction cost is very expensive, and the direct calibration mode is generally only equipped in units such as provincial electric academy of sciences, and if a user of the primary detection equipment performs submission on the detection equipment, too many times of submission generate too much submission cost, and too low times of submission can cause long-time invalid detection due to equipment problems.
The direct calibration mode is fixed in place, long in calibration time and not suitable for field calibration. In addition, in daily management of the equipment, the basic unit also needs a low-cost simple calibration method to preliminarily detect the detection equipment with problems, and then the detailed condition of the equipment is obtained by inspection, so that the inspection cost is reduced and the use efficiency of the equipment is improved.
In view of the above, the present inventors have conducted intensive studies on the above-mentioned defects of the existing calibration method when the existing calibration method is used in the field of the GIS partial discharge ultrahigh frequency detection device.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the field calibration method of the GIS partial discharge ultrahigh frequency detection equipment, which has the advantages of reasonable design, low cost, simple operation and strong performability and can quickly and qualitatively analyze the basic condition of the GIS partial discharge ultrahigh frequency detection equipment.
The invention solves the practical problem by adopting the following technical scheme:
a GIS partial discharge ultrahigh frequency detection equipment field calibration method comprises the following steps:
step 1, building a GIS ultrahigh frequency detection equipment field calibration platform which can be used in a test field;
step 2, bringing the GIS ultrahigh frequency detection equipment field calibration platform to a GTEM platform in a fully shielded laboratory for calibration and comparison;
and 3, when the detection personnel calibrate the GIS partial discharge ultrahigh frequency detection equipment in the test site, the detection personnel turn on a site calibration pulse source, place the ultrahigh frequency sensor in the measurement area in the aluminum box and externally connect the ultrahigh frequency detection equipment host, and calibrate the basic condition of the detection equipment by adopting an indirect calibration mode.
Moreover, the GIS ultrahigh frequency detection equipment field calibration platform in the step 1 comprises a full-shielding aluminum box, and the inside of the full-shielding aluminum box is divided into a field calibration pulse source fixing area and an ultrahigh frequency sensor measuring area; a field calibration pulse source is arranged in the field calibration pulse source fixing area and connected with an external power supply, an ultrahigh frequency sensor is arranged in an ultrahigh frequency sensor measuring area and connected with an external GIS partial discharge ultrahigh frequency monitoring equipment host;
and a position scale is arranged in the measuring area of the ultrahigh frequency sensor and used for accurately limiting the position of the ultrahigh frequency sensor.
Moreover, the field calibration pulse source comprises an isolation voltage reduction module, a half-wave rectification module, a full-wave rectification module, a differential comparison module, a digital amplitude shift keying modulation signal module and a dipole antenna; the output end of the isolation voltage reduction module is respectively connected with the half-wave rectification module and the full-wave rectification module, and the isolation voltage reduction module reduces a 220V power supply to 5-10V by adopting a small isolation transformer; the output end of the half-wave rectification module is connected with the differential comparison module and used for performing half-wave rectification on the waveform after voltage reduction so as to obtain a half-wave direct-current waveform with the waveform frequency consistent with the power grid frequency, the output end of the full-wave rectification module is connected with the differential comparison module and used for performing full-wave rectification on the waveform after voltage reduction, and the rectified waveform serves as an input signal of the differential comparison module and also serves as a direct-current power supply to supply power for the differential comparison module and the digital amplitude shift keying modulation signal module; the output end of the differential comparison module is connected with the digital amplitude shift keying modulation signal module and is used for comparing and outputting the half-wave direct current waveform serving as an input signal with the ground to obtain a square wave waveform with the frequency consistent with the power grid frequency; the output end of the digital amplitude shift keying modulation signal module is connected with a dipole antenna and is used for modulating the square waveform into a unipolar baseband rectangular pulse sequence in an amplitude modulation mode through a digital microwave channel; the dipole antenna is used for converting the baseband rectangular pulse sequence into electromagnetic waves to be transmitted to the ultrahigh frequency sensor, and the ultrahigh frequency sensor outputs electromagnetic wave signals obtained through coupling to a GIS partial discharge ultrahigh frequency detection equipment host connected outside the full-shielding aluminum box.
Moreover, the specific content of the step 2 includes:
(1) calibrating a GIS ultrahigh frequency detection device field calibration platform according to a direct calibration flow, and sequentially recording amplitude data comparison obtained by GTEM platform measurement equipment and a GIS partial discharge ultrahigh frequency detection device host under a specific ultrahigh frequency signal pulse;
(2) the method comprises the steps that a power line of a field calibration pulse source in a GIS ultrahigh frequency detection device field calibration platform is externally connected to a 220V alternating current power supply and is started, an ultrahigh frequency sensor of the GIS ultrahigh frequency detection device is placed in a measurement area in an aluminum box, position scales are arranged in the area to indicate the specific position of the ultrahigh frequency sensor, an output interface of the ultrahigh frequency sensor is externally connected to an input interface of a GIS ultrahigh frequency detection device host outside a full-shielding aluminum box through a cable, the position of the ultrahigh frequency sensor is moved in the aluminum box, an aluminum box cover is closed to keep the full-shielding state, and detection amplitude data comparison of different positions is recorded sequentially after the detection value of the GIS ultrahigh frequency detection device is stable;
(3) and integrating the two test data to finally form an indirect calibration comparison table, wherein the table records the position of the ultrahigh frequency sensor in the measurement area of the aluminum box, the detection value of the GIS ultrahigh frequency detection equipment on-site calibration platform and the signal frequency and amplitude setting value of the laboratory signal generator.
Moreover, the specific content of the step 3 includes:
(1) placing an ultrahigh frequency sensor near a calibration pulse source, and qualitatively analyzing whether a detection device can detect an ultrahigh frequency signal;
(2) placing the ultrahigh frequency sensor at different positions and keeping for a certain time, observing and calculating whether the measurement amplitude variation of the detection equipment is within the range of +/-5%, and quantitatively analyzing whether the stability is achieved;
(3) placing the ultrahigh frequency sensor from a position far away from the calibration pulse source to the near until the detection equipment measures the ultrahigh frequency signal and records the specific position, comparing the indirect calibration comparison table in the step (3) in the step 2, and qualitatively analyzing whether the sensitivity of the detection equipment changes;
(4) placing the ultrahigh frequency sensors according to the position sequence of the indirect calibration comparison table in the step (3) in the step 2, sequentially recording the detection values of the detection equipment, comparing the detection values of the indirect calibration comparison table, and qualitatively analyzing whether the amplitude linear error of the detection equipment changes or not;
(5) and (3) placing the ultrahigh frequency sensor at a position capable of detecting the ultrahigh frequency signal, observing whether the pulse number per second detected by the detection device is 50+ 5%, and quantitatively analyzing the pulse repetition rate calculation of the detection device.
The invention has the advantages and beneficial effects that:
1. the invention relates to a field calibration method of GIS partial discharge ultrahigh frequency detection equipment, which comprises the following steps of firstly, building a field calibration platform of the GIS ultrahigh frequency detection equipment which can be used in a test field; secondly, carrying out calibration comparison on a GIS ultrahigh frequency detection equipment field calibration platform and detection equipment on a GTEM platform of a laboratory to obtain an indirect calibration comparison table; and finally, in a test site, according to a certain calibration process, rapidly and qualitatively analyzing the basic condition of the GIS partial discharge ultrahigh frequency detection equipment by using an indirect calibration mode through an on-site calibration platform of the GIS ultrahigh frequency detection equipment, and meeting the requirements of basic units and maintainers on-site calibration. Compared with the existing direct calibration mode, the calibration method provided by the invention is simple to operate and strong in performability, and the calibration platform built under the method is simple in structure, low in cost and convenient to carry, so that the use efficiency of the detection equipment is greatly improved, and the validity of the measurement result is ensured.
2. The method adopts an indirect calibration mode, has low cost and simple operation, and can quickly and qualitatively analyze the basic conditions of GIS partial discharge ultrahigh frequency detection equipment, such as measurement stability, sensitivity, linear error, pulse repetition rate and the like. The invention can completely meet the requirements of basic level units and maintainers on field calibration, is convenient to operate, greatly improves the use efficiency of detection equipment and ensures the validity of measurement results.
Drawings
FIG. 1 is a diagram of the field calibration system of the GIS UHF detection device of the present invention;
FIG. 2 is a block diagram of the GTEM system of the present invention;
description of reference numerals:
(1) a GIS ultrahigh frequency detection device field calibration platform; (11) a fully shielded aluminum box; (12) calibrating a pulse source on site; (2) an ultrahigh frequency sensor; (3) GIS partial discharge ultrahigh frequency detection equipment host; (4) a GTEM platform; (41) measuring and controlling a computer; (42) a signal generator; (43) measuring and controlling a computer; (44) a GTEM cell;
Detailed Description
The embodiments of the invention will be described in further detail below with reference to the accompanying drawings:
a GIS partial discharge ultrahigh frequency detection equipment field calibration method comprises the following steps:
step 1, building a GIS ultrahigh frequency detection equipment field calibration platform (1) which can be used in a test field as shown in figure 1;
the GIS ultrahigh frequency detection equipment field calibration platform (1) comprises a full-shielding aluminum box (11), and the inside of the full-shielding aluminum box (11) is divided into a field calibration pulse source (12) fixing area and an ultrahigh frequency sensor (2) measuring area; a field calibration pulse source (12) is arranged in a fixed area of the field calibration pulse source (12), the field calibration pulse source (12) is connected with an external power supply, an ultrahigh frequency sensor (2) is arranged in a measurement area of the ultrahigh frequency sensor (2), and the ultrahigh frequency sensor (2) is connected with an external GIS partial discharge ultrahigh frequency monitoring equipment host (3);
in the embodiment, the full-shielding aluminum box (11) is formed by welding aluminum metal materials, has a shielding anti-interference effect, and prevents an external ultrahigh frequency signal from influencing a calibration result.
In the embodiment, a fixed area of a field calibration pulse source (12) and a measurement area of an ultrahigh frequency sensor (2) are divided in a full-shielding aluminum box (11), a small-caliber through hole is formed in the box wall near the fixed area of the field calibration pulse source (12) and used for externally connecting a power supply of the field calibration pulse source (12) to a 220V power supply, and meanwhile, a metal shell in the area is reliably connected with a ground wire of the field power supply, so that the shielding effect is enhanced. A small-caliber perforation is arranged on the box wall near the measuring area of the ultrahigh frequency sensor (2) and used for connecting the ultrahigh frequency sensor (2) and a GIS partial discharge ultrahigh frequency detection equipment host (3) by a high frequency cable;
in the embodiment, a position scale is arranged in the measuring area of the ultrahigh frequency sensor (2) and is used for accurately placing the position of the ultrahigh frequency sensor (2).
The GIS ultrahigh frequency detection equipment field calibration platform (1) is characterized in that a field calibration pulse source is a core instrument of the platform and comprises an isolation voltage reduction module, a half-wave rectification module, a full-wave rectification module, a differential comparison module, a digital amplitude shift keying modulation signal module and a dipole antenna;
the output end of the isolation voltage reduction module is respectively connected with the half-wave rectification module and the full-wave rectification module, and the isolation voltage reduction module reduces a 220V power supply to 5-10V by adopting a small isolation transformer, so that the requirements of the voltage range and the safety isolation of a subsequent circuit are met;
the output end of the half-wave rectification module is connected with the differential comparison module and is used for performing half-wave rectification on the waveform after voltage reduction so as to obtain a half-wave direct current waveform with the waveform frequency consistent with the power grid frequency,
the output end of the full-wave rectification module is connected with the differential comparison module and is used for performing full-wave rectification on the waveform after voltage reduction, and the rectified waveform is used as an input signal of the differential comparison module and is also used as a direct-current power supply to supply power for the differential comparison module and the digital amplitude shift keying modulation signal module; the output end of the differential comparison module is connected with the digital amplitude shift keying modulation signal module and is used for comparing and outputting the half-wave direct current waveform as an input signal with the ground to obtain a square wave waveform with the frequency consistent with the frequency of the power grid,
the output end of the digital amplitude shift keying modulation signal module is connected with a dipole antenna and is used for modulating the square waveform into a unipolar baseband rectangular pulse sequence in an amplitude modulation mode through a digital microwave channel;
in this embodiment, the digital amplitude shift keying modulation signal module may adopt a 315MHz crystal oscillator, so that the pulse sequence carrier frequency is 315 MHz;
the dipole antenna is used for converting the baseband rectangular pulse sequence into electromagnetic waves to be transmitted to the ultrahigh frequency sensor, and the ultrahigh frequency sensor outputs electromagnetic wave signals obtained through coupling to a GIS partial discharge ultrahigh frequency detection equipment host connected outside the full-shielding aluminum box.
The on-site calibration pulse source built by the modules can generate ultrahigh frequency signals with stable amplitude, the frequency of the pulse signals is 315MHz, the typical bandwidth (300MHz to 1500MHz) of GIS partial discharge ultrahigh frequency measurement is met, and the pulse repetition frequency is consistent with the frequency of a power grid.
And 2, bringing the GIS ultrahigh frequency detection equipment field calibration platform (1) to a GTEM platform (4) in a fully shielded laboratory for calibration and comparison.
In this embodiment, as shown in fig. 2, the GTEM platform (4) in the fully shielded laboratory mainly includes a measurement and control computer (41), a signal generator (42), a high-speed oscilloscope (43), and a GTEM cell (44);
in this embodiment, the measurement and control computer (41) is provided with related control and analysis software, and under the operation of a detection person, the measurement and control computer can control the signal generator (42) to send out a specified ultrahigh frequency signal, and can control the high-speed oscilloscope (43) to detect the output signal of the signal generator (42) and the ultrahigh frequency signal (2) acquired by the ultrahigh frequency sensor (2), and analyze the information such as the amplitude of the signal by using the control and analysis software.
The signal generator (42) sends out a specified ultrahigh frequency signal under the control of the measurement and control computer (41) and inputs the signal into the high-speed oscilloscope (43) and the GTEM chamber (44).
The high-speed oscilloscope (43) detects the output signal of the signal generator (42) and the ultrahigh frequency signal (2) acquired by the ultrahigh frequency sensor (2) under the control of the measurement and control computer (41).
The GTEM cell (44) is used as an antenna to convert an ultrahigh frequency signal into an ultrahigh frequency electromagnetic wave to be output, is made of an aluminum alloy metal material and is used for shielding external interference, and the influence of signal refraction, reflection and propagation attenuation is eliminated through a transition transmission line type structure of the GTEM cell, the bottom of the GTEM cell (44) is provided with a conventional N-shaped joint which is used for receiving the ultrahigh frequency signal input by a signal generator (42), the side edge of the GTEM cell is provided with an opening for outputting the ultrahigh frequency electromagnetic wave, and an ultrahigh frequency sensor (2) is arranged at the opening and converts the ultrahigh frequency electromagnetic wave into the ultrahigh frequency signal.
The specific work content of the step 2 comprises:
(1) the GIS partial discharge ultrahigh frequency detection equipment is carried out according to a direct calibration process, a direct calibration mode mainly adopts a GTEM platform (4) for calibration, a detection person uses a measurement and control computer (41) to control a signal generator (42) to output a specific ultrahigh frequency signal to a high-speed oscilloscope (43) and a GTEM cell (44), the GTEM cell (44) serves as an antenna to convert the input ultrahigh frequency signal into an ultrahigh frequency electromagnetic wave and output the ultrahigh frequency electromagnetic wave to an ultrahigh frequency sensor (2), a signal sensed by the ultrahigh frequency sensor (2) is connected and input to the high-speed oscilloscope (43) and a GIS partial discharge ultrahigh frequency detection equipment host (3) through a high frequency cable, the measurement and control computer (41) controls the high-speed oscilloscope (43) to detect firstly and then uploads a detection result to the measurement and control computer (41) through software for analysis to obtain an ultrahigh frequency signal amplitude, and the GIS partial discharge ultrahigh frequency detection equipment host (3) analyzes the input ultrahigh frequency signal to obtain the ultrahigh frequency. The detection personnel repeats the processes and sequentially records the comparison of the amplitude data obtained by the detection control computer (41) and the GIS partial discharge ultrahigh frequency detection equipment host (3) under the specific ultrahigh frequency signal pulse.
(2) A detector externally connects a power line of a field calibration pulse source (12) in a GIS ultrahigh frequency detection device field calibration platform (1) to a 220V alternating current power supply and starts the GIS ultrahigh frequency detection device, an ultrahigh frequency sensor (2) of the GIS ultrahigh frequency detection device is placed in a measurement area in an aluminum box, position scales indicate the specific position of the sensor in the area, signals obtained by the sensor are externally connected to a GIS ultrahigh frequency detection device host (3) outside a full-shielding aluminum box through a cable, the position of the ultrahigh frequency sensor is moved in the aluminum box (11), the aluminum box cover is closed, the full-shielding state is maintained, and after the detection value of the GIS ultrahigh frequency detection device is stable, detection amplitude data at different positions are recorded in sequence for comparison;
(3) the two kinds of detection amplitude data are integrated to finally form an indirect calibration comparison table, and the table records the position of the ultrahigh frequency sensor in the measurement area of the aluminum box (11), the detection value of the GIS ultrahigh frequency detection equipment host (3), the detection value of the software of the measurement and control computer (41) and the signal frequency and amplitude setting value of the signal generator (42).
Step 3, when a tester calibrates the GIS partial discharge ultrahigh frequency detection equipment in a test site, the tester turns on a site calibration pulse source, places the ultrahigh frequency sensor in a measurement area in an aluminum box and is externally connected with an ultrahigh frequency detection equipment host, and calibrates the basic condition of the detection equipment by adopting an indirect calibration mode;
the specific work content of the step 3 comprises:
(1) placing an ultrahigh frequency sensor near a calibration pulse source, and qualitatively analyzing whether a detection device can detect an ultrahigh frequency signal;
(2) placing the ultrahigh frequency sensor at different positions and keeping for a certain time, observing and calculating whether the measurement amplitude variation of the detection equipment is within the range of +/-5%, and quantitatively analyzing whether the stability is achieved;
(3) placing the ultrahigh frequency sensor from a position far away from the calibration pulse source to the near until the detection equipment measures the ultrahigh frequency signal and records the specific position, comparing the indirect calibration comparison table in the step (3) in the step 2, and qualitatively analyzing whether the sensitivity of the detection equipment changes;
(4) placing the ultrahigh frequency sensors according to the position sequence of the indirect calibration comparison table in the step (3) in the step 2, sequentially recording the detection values of the detection equipment, comparing the detection values of the indirect calibration comparison table, and qualitatively analyzing whether the amplitude linear error of the detection equipment changes or not;
(5) and (3) placing the ultrahigh frequency sensor at a position capable of detecting the ultrahigh frequency signal, observing whether the pulse number per second detected by the detection device is 50+ 5%, and quantitatively analyzing the pulse repetition rate calculation of the detection device.
It should be emphasized that the examples described herein are illustrative and not restrictive, and thus the present invention includes, but is not limited to, those examples described in this detailed description, as well as other embodiments that can be derived from the teachings of the present invention by those skilled in the art and that are within the scope of the present invention.
Claims (5)
1. A GIS partial discharge ultrahigh frequency detection equipment field calibration method is characterized in that: the method comprises the following steps:
step 1, building a GIS ultrahigh frequency detection equipment field calibration platform which can be used in a test field;
step 2, bringing the GIS ultrahigh frequency detection equipment field calibration platform to a GTEM platform in a fully shielded laboratory for calibration and comparison;
step 3, when a tester calibrates the GIS partial discharge ultrahigh frequency detection equipment in a test site, the tester turns on a site calibration pulse source, places the ultrahigh frequency sensor in a measurement area in an aluminum box and is externally connected with an ultrahigh frequency detection equipment host, and calibrates the basic condition of the detection equipment by adopting an indirect calibration mode;
the specific steps of the step 3 comprise:
(1) placing an ultrahigh frequency sensor near a calibration pulse source, and qualitatively analyzing whether a detection device can detect an ultrahigh frequency signal;
(2) placing the ultrahigh frequency sensor at different positions and keeping for a certain time, observing and calculating whether the measurement amplitude variation of the detection equipment is within the range of +/-5%, and quantitatively analyzing whether the stability is achieved;
(3) placing the ultrahigh frequency sensor from a position far away from the calibration pulse source to the near until the detection equipment measures the ultrahigh frequency signal and records the specific position, comparing the ultrahigh frequency signal with the specific position to calibrate a comparison table indirectly, and qualitatively analyzing whether the sensitivity of the detection equipment changes;
(4) placing the ultrahigh frequency sensors according to the position sequence of the indirect calibration comparison table, sequentially recording the detection values of the detection equipment, comparing the detection values of the indirect calibration comparison table, and qualitatively analyzing whether the amplitude linear error of the detection equipment changes or not;
(5) and (3) placing the ultrahigh frequency sensor at a position capable of detecting the ultrahigh frequency signal, observing whether the pulse number per second detected by the detection device is 50+ 5%, and quantitatively analyzing the pulse repetition rate calculation of the detection device.
2. The method for calibrating the GIS partial discharge ultrahigh frequency detection equipment on site according to claim 1, characterized in that: the GIS ultrahigh frequency detection equipment field calibration platform in the step 1 comprises a full-shielding aluminum box, and the inside of the full-shielding aluminum box is divided into a field calibration pulse source fixing area and an ultrahigh frequency sensor measuring area; a field calibration pulse source is arranged in the field calibration pulse source fixing area and connected with an external power supply, an ultrahigh frequency sensor is arranged in an ultrahigh frequency sensor measuring area and connected with an external GIS partial discharge ultrahigh frequency monitoring equipment host;
3. the method for calibrating the GIS partial discharge ultrahigh frequency detection equipment on site according to claim 2, characterized in that: and a position scale is arranged in the measuring area of the ultrahigh frequency sensor and used for accurately limiting the position of the ultrahigh frequency sensor.
4. The method for calibrating the GIS partial discharge ultrahigh frequency detection equipment on site according to claim 2, characterized in that: the field calibration pulse source comprises an isolation voltage reduction module, a half-wave rectification module, a full-wave rectification module, a differential comparison module, a digital amplitude shift keying modulation signal module and a dipole antenna; the output end of the isolation voltage reduction module is respectively connected with the half-wave rectification module and the full-wave rectification module, and the isolation voltage reduction module reduces a 220V power supply to 5-10V by adopting a small isolation transformer; the output end of the half-wave rectification module is connected with the differential comparison module and used for performing half-wave rectification on the waveform after voltage reduction so as to obtain a half-wave direct-current waveform with the waveform frequency consistent with the power grid frequency, the output end of the full-wave rectification module is connected with the differential comparison module and used for performing full-wave rectification on the waveform after voltage reduction, and the rectified waveform serves as an input signal of the differential comparison module and also serves as a direct-current power supply to supply power for the differential comparison module and the digital amplitude shift keying modulation signal module; the output end of the differential comparison module is connected with the digital amplitude shift keying modulation signal module and is used for comparing and outputting the half-wave direct current waveform serving as an input signal with the ground to obtain a square wave waveform with the frequency consistent with the power grid frequency; the output end of the digital amplitude shift keying modulation signal module is connected with a dipole antenna and is used for modulating the square waveform into a unipolar baseband rectangular pulse sequence in an amplitude modulation mode through a digital microwave channel; the dipole antenna is used for converting the baseband rectangular pulse sequence into electromagnetic waves to be transmitted to the ultrahigh frequency sensor, and the ultrahigh frequency sensor is used for outputting electromagnetic wave signals obtained through coupling to a GIS partial discharge ultrahigh frequency detection equipment host connected outside the full-shielding aluminum box.
5. The method for calibrating the GIS partial discharge ultrahigh frequency detection equipment on site according to claim 1, characterized in that: the specific steps of the step 2 comprise:
(1) calibrating a GIS ultrahigh frequency detection device field calibration platform according to a direct calibration flow, and sequentially recording amplitude data comparison obtained by GTEM platform measurement equipment and a GIS partial discharge ultrahigh frequency detection device host under a specific ultrahigh frequency signal pulse;
(2) externally connecting a power line of a field calibration pulse source in a GIS ultrahigh frequency detection device field calibration platform to a 220V alternating current power supply and starting the power line, placing an ultrahigh frequency sensor of the GIS ultrahigh frequency detection device in a measurement area in an aluminum box, wherein position scales indicate the specific position of the ultrahigh frequency sensor in the area, outputting an electromagnetic wave signal obtained by coupling to a GIS local discharge ultrahigh frequency detection device host connected outside a full-shielding aluminum box by the ultrahigh frequency sensor, moving the position of the ultrahigh frequency sensor in the aluminum box, closing an aluminum box cover, keeping the full-shielding state, and sequentially recording detection amplitude data at different positions for comparison after the GIS ultrahigh frequency detection device detects stable numerical values;
(3) and integrating the two test data to finally form an indirect calibration comparison table, wherein the table records the position of the ultrahigh frequency sensor in the measurement area of the aluminum box, the detection value of the GIS ultrahigh frequency detection equipment on-site calibration platform and the signal frequency and amplitude setting value of the laboratory signal generator.
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| CN109946573B (en) * | 2019-03-08 | 2021-10-22 | 国网山东省电力公司日照供电公司 | Local discharge direction finding method and system based on clustering and wireless sensor array |
| CN110286346A (en) * | 2019-07-30 | 2019-09-27 | 南京荣港电气技术有限公司 | The automated calibration system and method for a kind of superfrequency part instrument |
| CN111562468B (en) * | 2020-04-02 | 2023-03-14 | 中国电力科学研究院有限公司 | GIS partial discharge signal measurement system and GIS partial discharge fault diagnosis method |
| CN111562531B (en) * | 2020-04-08 | 2022-11-18 | 中国电力科学研究院有限公司 | Method and system for detecting sensitivity of GIS built-in ultrahigh frequency sensor |
| CN111745351B (en) * | 2020-06-15 | 2021-09-17 | 中国长江电力股份有限公司 | 500kV welding type GIL equipment tapping overhauling construction method |
| CN112924917A (en) * | 2020-12-29 | 2021-06-08 | 广东电网有限责任公司电力科学研究院 | On-site calibration platform of ultrahigh frequency partial discharge on-line monitoring system |
| CN113093080A (en) * | 2021-04-13 | 2021-07-09 | 北京振中建园电力技术发展有限公司 | Multifunctional packaging box for partial discharge tester |
| CN113466637A (en) * | 2021-06-08 | 2021-10-01 | 国网宁夏电力有限公司电力科学研究院 | Phase synchronization measurement method, device and system for partial discharge of transformer |
| CN113702779A (en) * | 2021-08-23 | 2021-11-26 | 国网山东省电力公司电力科学研究院 | Local discharge ultrahigh frequency sensor field calibration method for transformer |
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