CN111103513A - GIS partial discharge online detector based on high-frequency sensing - Google Patents
GIS partial discharge online detector based on high-frequency sensing Download PDFInfo
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- CN111103513A CN111103513A CN201911216547.4A CN201911216547A CN111103513A CN 111103513 A CN111103513 A CN 111103513A CN 201911216547 A CN201911216547 A CN 201911216547A CN 111103513 A CN111103513 A CN 111103513A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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Abstract
The invention relates to a GIS partial discharge online detector based on high-frequency sensing, which is characterized in that: the instrument comprises an instrument main body, a UHF external sensor and a main control computer, wherein a receiving end of the instrument main body is connected with an output end of the UHF external sensor in a one-way signal mode, the UHF external sensor is located at an insulation gap of a GIS shell, a signal input end of the UHF external sensor faces the insulation gap of the GIS shell, and the main control computer is connected with the instrument main body in a two-way signal mode.
Description
Technical Field
The invention relates to a computer, in particular to a GIS partial discharge online detector based on high-frequency sensing.
Background
GIS equipment has the advantages of high operational reliability, convenient maintenance, small occupied area and the like, and is more and more widely applied. After the equipment is installed on site, a pressure test is carried out to verify whether the equipment is damaged in the transportation and installation processes and to check the reassembly correctness of the equipment. The GIS equipment which is accepted and put into operation generally has good operation condition. However, operation experience shows that some defects existing in the GIS equipment may not be harmful and not easy to be found, but with the increase of operation years, under the action of switch operation vibration and electrostatic force, the movement of foreign matter fragments or insulation aging and the like may generate local discharge phenomena, so that the breakdown discharge accident is finally developed, and the power failure is needed to overhaul the equipment, thereby causing great economic loss. The higher the GIS voltage level, the greater the loss due to power outage.
In actual operation, an effective means for detecting the GIS equipment is needed, the insulation fault in the GIS equipment can be found as soon as possible, the maintenance work of the GIS can be carried out in a planned way, the maintenance time is shortened, the maintenance cost is saved, and the operation reliability of the GIS is improved. Therefore, research work on GIS fault detection is carried out.
Partial discharge detection is an important method for diagnosing the insulation state of electric power equipment. Failures of GIS equipment involve rapid transient overvoltages, insulation aging, poor sealing, etc. caused by insulation, overheating, switching operations, etc. GIS equipment can have the defects such as electrode surface dirt, burrs, free particles, poor contact and floating potential in the GIS in the manufacturing and using processes. The defects cause the GIS to cause the distortion of the internal electric field under the high-voltage electric field, the abnormal electric field develops to a certain degree, partial discharge in the GIS is formed, the partial discharge can be regarded as a premonitory sign of the insulation fault of the equipment, and therefore the possibility that the insulation fault will occur inside the equipment can be judged by detecting the partial discharge condition inside the equipment. In GIS partial discharge detection, the Ultra High Frequency (UHF) method is a new technology developed in recent years. Whether partial discharge occurs in the GIS or not is judged by measuring electromagnetic waves radiated by internal insulation hidden troubles of the GIS under the operating voltage.
The field test of the GIS equipment is used for discovering and eliminating potential insulation fault hazards in the GIS caused by factors such as transportation, installation and the like. The device is generally divided into sections to reduce the capacitive load during the test and thereby limit the amount of discharge during breakdown. The field test is mainly a voltage withstand test, but the partial discharge detection is very important and effective in order to improve the effectiveness of finding insulation defects and reduce the side effects of damaging normal insulation and the like.
Even though a part of defects including insulation hidden dangers can be found in field tests, from the actual operation condition, the faults caused by the insulation hidden dangers of GIS equipment still partially occur after the equipment is put into operation, particularly within a period of time just after the equipment is put into operation, and therefore partial discharge detection is very necessary for timely finding the faults.
When partial discharge occurs in the GIS equipment, various phenomena occur along with the partial discharge, such as gas decomposition, light radiation, sound vibration, excitation of high-frequency electromagnetic waves and the like, and the characterization phenomena can be used for detecting the partial discharge of the GIS. According to the working principle, the partial discharge detection can be divided into an electric method and a non-electric method, the latter method is a chemical method, an optical method, a mechanical method and the like, and the former method is a method for externally attaching electrodes, a method for measuring the current of a grounding wire and the like, so that the partial discharge signal identification reliability is not high, the sensitivity is low, the anti-interference performance is poor, and the practical effect cannot be satisfied by field operators.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the GIS partial discharge online detector based on high-frequency sensing is provided.
The technical scheme for solving the technical problem is as follows: a GIS partial discharge on-line detector based on high-frequency sensing is characterized in that: the instrument comprises an instrument main body, a UHF external sensor and a main control computer, wherein a receiving end of the instrument main body is connected with an output end of the UHF external sensor in a one-way signal mode, the UHF external sensor is located at an insulation gap of a GIS shell, a signal input end of the UHF external sensor faces the insulation gap of the GIS shell, and the main control computer is connected with the instrument main body in a two-way signal mode.
The detector main body comprises a shell, a microprocessor, a filter circuit, a detection circuit, a gain circuit, an A/D acquisition module, an A/D driving module, an FIFO module, a square wave generation module and a frequency multiplier.
The structure of the UHF sensor is shown in fig. 2, and it includes an inductor, a UHF amplifying circuit, and a pulse shaping circuit. The inductor receives the electromagnetic pulse signal of the partial discharge, and the electromagnetic pulse signal is amplified by the UHF amplifying circuit and outputs the UHF pulse signal of the partial discharge at the BNC port.
An ultrahigh frequency sensor: the device is used for capturing an electromagnetic waveform generated by discharge;
a filter circuit: the signal of the sensor is limited to the frequency band of 0.3-3GHz, and other interference such as corona interference is avoided;
a detection circuit: forming a plurality of pulses in one discharge into an envelope curve;
a gain circuit: compensating for signal attenuation in the filtering and detection circuit;
the A/D acquisition module: because the signal is ns-level, and the acquisition chip can only reach the sampling frequency of 400MHz at the fastest, 3A/D are adopted together and sequentially delay for sampling, and finally the sampling frequency can reach about 1.05 GHz;
the A/D driving module: the start time sequence for controlling the three A/Ds is generated by matching with the microprocessor;
an FIFO module: because the microprocessor needs to generate the working time sequence for controlling the three A/Ds and can not acquire the conversion data of the A/Ds at the same time, the conversion data of the A/Ds automatically enter an FIFO (first-in first-out) for caching, overflow marks are generated for the microprocessor, and the microprocessor reads the overflow marks uniformly;
the square wave generation module: generating a reference square wave of 500 MHz;
a frequency multiplier: generating a control time sequence of the A/D driving module;
the microprocessor: the embedded ARM chip LP2294 is used for connecting the whole circuit and realizing the functions of generating an A/D working time sequence, processing data, controlling liquid crystal display and the like;
the invention has the beneficial effects that:
its GIS partial discharge on-line measuring appearance not only can be used to the maintainer and carries out routine detection to the equipment of a plurality of GIS stations, still can be used to carry out long-time automatic on-line monitoring to certain GIS station, and the insulating situation of sign equipment inside can effectively prevent unexpected incident, provides scientific basis for the state of GIS equipment is overhauld simultaneously.
The partial discharge online monitoring system developed by the project overcomes the strong electromagnetic and electrostatic interference in the space of the transformer substation, perfects the technical level of monitoring the internal insulation condition of the GIS equipment and has completely independent intellectual property rights.
At present, other measuring instruments display measured high-frequency signals or spectrograms, and it is extremely difficult for field operators on duty to accurately judge the discharge or the type. The project adopts an original technology to carry out envelope processing on the high-frequency signal measured by the ultrahigh-frequency sensor, the output is a low-frequency time domain signal corresponding to the power frequency of the power grid, the corresponding relation between the low-frequency signal and the discharge characteristic is fully demonstrated through a discharge experiment, and great convenience is brought to the observation of discharge for field personnel.
Drawings
FIG. 1 is a schematic diagram of UHF sensing outside a GIS partial discharge body of the present invention;
FIG. 2 is a block diagram of the UHF sensor of the present invention;
FIG. 3 is a hardware block diagram of the detector;
FIG. 4 is a flowchart of the overall process of the detector;
fig. 5 shows the experimental apparatus and the measurement principle.
1. Water resistance 2, spiral seal instrument 3, conducting rod 4, supporting insulating plate 5, supporting instrument 6, epoxy resin plate 7, air pumping and filling place 8, sealing ring 9, barometer 10, sensor, 11 disc insulator, 12 sensor, 13GIS shell.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Referring to fig. 1 to 5, in embodiment 1, a GIS partial discharge online detector based on high-frequency sensing is characterized in that: the instrument comprises an instrument main body, a UHF external sensor and a main control computer, wherein a receiving end of the instrument main body is connected with an output end of the UHF external sensor in a one-way signal mode, the UHF external sensor is located at an insulation gap of a GIS shell, a signal input end of the UHF external sensor faces the insulation gap of the GIS shell, and the main control computer is connected with the instrument main body in a two-way signal mode.
The detector main body comprises a shell, a microprocessor, a filter circuit, a detection circuit, a gain circuit, an A/D acquisition module, an A/D driving module, an FIFO module, a square wave generation module and a frequency multiplier.
The structure of the UHF sensor is shown in fig. 2, and it includes an inductor, a UHF amplifying circuit, and a pulse shaping circuit. The inductor receives the electromagnetic pulse signal of the partial discharge, and the electromagnetic pulse signal is amplified by the UHF amplifying circuit and outputs the UHF pulse signal of the partial discharge at the BNC port.
An ultrahigh frequency sensor: the device is used for capturing an electromagnetic waveform generated by discharge;
a filter circuit: the signal of the sensor is limited to the frequency band of 0.3-3GHz, and other interference such as corona interference is avoided;
a detection circuit: forming a plurality of pulses in one discharge into an envelope curve;
a gain circuit: compensating for signal attenuation in the filtering and detection circuit;
the A/D acquisition module: because the signal is ns-level, and the acquisition chip can only reach the sampling frequency of 400MHz at the fastest, 3A/D are adopted together and sequentially delay for sampling, and finally the sampling frequency can reach about 1.05 GHz;
the A/D driving module: the start time sequence for controlling the three A/Ds is generated by matching with the microprocessor;
an FIFO module: because the microprocessor needs to generate the working time sequence for controlling the three A/Ds and can not acquire the conversion data of the A/Ds at the same time, the conversion data of the A/Ds automatically enter an FIFO (first-in first-out) for caching, overflow marks are generated for the microprocessor, and the microprocessor reads the overflow marks uniformly;
the square wave generation module: generating a reference square wave of 500 MHz;
a frequency multiplier: generating a control time sequence of the A/D driving module;
the microprocessor: the embedded ARM chip LP2294 is used for connecting the whole circuit and realizing the functions of generating an A/D working time sequence, processing data, controlling liquid crystal display and the like;
the present invention is not limited to the present embodiment, and it is possible for those skilled in the art to easily reproduce and modify the present invention without inventive efforts within the scope of the present invention claimed.
Claims (3)
1. A GIS partial discharge on-line detector based on high-frequency sensing is characterized in that: the instrument comprises an instrument main body, a UHF external sensor and a main control computer, wherein a receiving end of the instrument main body is connected with an output end of the UHF external sensor in a one-way signal mode, the UHF external sensor is located at an insulation gap of a GIS shell, a signal input end of the UHF external sensor faces the insulation gap of the GIS shell, and the main control computer is connected with the instrument main body in a two-way signal mode.
2. The high-frequency sensing-based GIS partial discharge online detector as claimed in claim 1, wherein: the detector main body comprises a shell, a microprocessor, a filter circuit, a detection circuit, a gain circuit, an A/D acquisition module, an A/D driving module, an FIFO module, a square wave generation module and a frequency multiplier.
3. The high-frequency sensing-based GIS partial discharge online detector as claimed in claim 1, wherein: the structure of the UHF sensor is shown in fig. 2, and it includes an inductor, a UHF amplifying circuit, and a pulse shaping circuit. The inductor receives the electromagnetic pulse signal of the partial discharge, and the electromagnetic pulse signal is amplified by the UHF amplifying circuit and outputs the UHF pulse signal of the partial discharge at the BNC port.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911216547.4A CN111103513A (en) | 2019-12-02 | 2019-12-02 | GIS partial discharge online detector based on high-frequency sensing |
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| CN201911216547.4A CN111103513A (en) | 2019-12-02 | 2019-12-02 | GIS partial discharge online detector based on high-frequency sensing |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387683A (en) * | 2008-10-31 | 2009-03-18 | 东北电网有限公司长春超高压局 | Partial discharge detecting method for potting breaker |
| CN202421420U (en) * | 2011-11-29 | 2012-09-05 | 甘肃省电力公司兰州超高压输变电公司 | Ultrahigh frequency and pulse current based GIS (gas insulated switchgear) partial-discharge online monitoring device |
| CN203811754U (en) * | 2014-02-24 | 2014-09-03 | 大连电力勘察设计院有限公司 | An enclosed type gas insulation combined electric appliance partial discharge detection device |
| CN203811760U (en) * | 2014-04-04 | 2014-09-03 | 国家电网公司 | Partial discharge source positioning device |
-
2019
- 2019-12-02 CN CN201911216547.4A patent/CN111103513A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387683A (en) * | 2008-10-31 | 2009-03-18 | 东北电网有限公司长春超高压局 | Partial discharge detecting method for potting breaker |
| CN202421420U (en) * | 2011-11-29 | 2012-09-05 | 甘肃省电力公司兰州超高压输变电公司 | Ultrahigh frequency and pulse current based GIS (gas insulated switchgear) partial-discharge online monitoring device |
| CN203811754U (en) * | 2014-02-24 | 2014-09-03 | 大连电力勘察设计院有限公司 | An enclosed type gas insulation combined electric appliance partial discharge detection device |
| CN203811760U (en) * | 2014-04-04 | 2014-09-03 | 国家电网公司 | Partial discharge source positioning device |
Non-Patent Citations (1)
| Title |
|---|
| 董化新: "GIS设备局部放电检测装置的研制", 黑龙江电力, vol. 30, no. 6, pages 433 - 435 * |
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