CN219777843U - Device for measuring pulse current partial discharge distribution of insulator - Google Patents
Device for measuring pulse current partial discharge distribution of insulator Download PDFInfo
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- CN219777843U CN219777843U CN202320643760.9U CN202320643760U CN219777843U CN 219777843 U CN219777843 U CN 219777843U CN 202320643760 U CN202320643760 U CN 202320643760U CN 219777843 U CN219777843 U CN 219777843U
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- 239000012212 insulator Substances 0.000 title claims abstract description 15
- 238000009826 distribution Methods 0.000 title claims abstract description 14
- 238000002474 experimental method Methods 0.000 claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 238000000691 measurement method Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
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- 230000003287 optical effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005375 photometry Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The utility model discloses a device for measuring the distribution of partial discharge of an insulator pulse current, and belongs to the technical field of partial discharge detection. The utility model comprises the following steps: the device comprises an armored power frequency experiment transformer, an experiment tool and a measurement system; the armored power frequency experiment transformer is connected with the experiment tool and is used for applying voltages to the test object unit and the reference unit in the experiment tool, the measuring system is connected with the test object unit and the reference unit in the experiment tool, and after the armored power frequency experiment transformer is used for applying voltages to the test object unit and the reference unit in the experiment tool, the measuring system measures pulse current partial discharge of the test object unit for distribution measurement. The utility model can be used for detecting the high-sensitivity signal of the partial discharge of the insulator, identifying the partial discharge of 0.1pC and quantitatively giving out the degradation degree of the defect, effectively evaluating the running state of the GIS equipment, providing a reference basis for the detection and maintenance strategy of the GIS equipment and improving the power supply reliability of the GIS equipment.
Description
Technical Field
The utility model relates to the technical field of partial discharge detection, in particular to a device for measuring the pulse current partial discharge distribution of an insulator.
Background
Partial discharge is a main cause of insulation deterioration and is also a main sign and expression form of insulation deterioration. Insulation failure causes large power equipment failures often premonited by partial discharge activity. Under actual operation conditions, the partial discharge interference of the transformer equipment is larger and is at least more than 100pC, and the calibration sensitivity of the GIS partial discharge sensor is at least 5pC, the noise signal amplitude is far larger than the partial discharge signal amplitude, and the problem in the prior art cannot be effectively solved, so that each detection platform including the south network only can evaluate whether the sensor can identify defects or not, but the functional effectiveness of the sensor cannot be quantitatively evaluated. Therefore, the development of the partial discharge high-sensitivity detection method has important significance.
Disclosure of Invention
In view of the above problems, the present utility model proposes an apparatus for pulse current partial discharge distribution measurement, comprising: the device comprises an armored power frequency experiment transformer, an experiment tool and a measurement system;
the armored power frequency experiment transformer is connected with the experiment tool and is used for applying voltages to the test object unit and the reference unit in the experiment tool, the measuring system is connected with the test object unit and the reference unit in the experiment tool, and after the armored power frequency experiment transformer is used for applying voltages to the test object unit and the reference unit in the experiment tool, the measuring system measures pulse current partial discharge of the test object unit for distribution measurement.
Optionally, the highest applied voltage of the armored power frequency experimental transformer is 120kV.
Optionally, SF6 gas with absolute pressure of 0.4MPa is filled in the experimental fixture.
Optionally, the test unit and the reference unit are electrically isolated from other parts of the experimental fixture.
Optionally, the reference cell is a matched capacitor.
Optionally, the measurement system includes: a detection resistor Z1, a detection resistor Z2, a UHF sensor 1 and a UHF sensor 2;
the detection resistor Z 1 The test sample unit is connected with the ground, and the detection resistor Z 2 A reference unit is connected and grounded, and the detection resistor Z 1 And a detection resistor Z 2 Measuring pulse current partial discharge of the sample unit based on a distributed pulse current measurement method;
the UHF sensor 1 and the UHF sensor 2 are connected with a reference unit, the UHF sensor 1 is arranged near a flange of the reference unit in the experimental tool, the UHF sensor 2 is arranged outside the experimental tool, and the UHF sensor 1 and the UHF sensor 2 measure pulse current partial discharge of a sample unit based on an ultrahigh frequency method;
optionally, the measurement system further comprises: the photomultiplier is placed at a quartz observation window outside the experimental tool, and whether pulse current partial discharge occurs or not is observed through quartz glass.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a device for measuring pulse current partial discharge distribution, which comprises: the device comprises an armored power frequency experiment transformer, an experiment tool and a measurement system; the armored power frequency experiment transformer is connected with the experiment tool and is used for applying voltages to the test object unit and the reference unit in the experiment tool, the measuring system is connected with the test object unit and the reference unit in the experiment tool, and after the armored power frequency experiment transformer is used for applying voltages to the test object unit and the reference unit in the experiment tool, the measuring system measures pulse current partial discharge of the test object unit for distribution measurement. The utility model can be used for detecting the high-sensitivity signal of the partial discharge of the insulator, identifying the partial discharge of 0.1pC and quantitatively giving out the degradation degree of the defect, effectively evaluating the running state of the GIS equipment, providing a reference basis for the detection and maintenance strategy of the GIS equipment and improving the power supply reliability of the GIS equipment.
Drawings
FIG. 1 is a block diagram of the apparatus of the present utility model;
fig. 2 (a) and (b) are schematic diagrams of the distributed measurement method of the device of the present utility model.
Detailed Description
The exemplary embodiments of the present utility model will now be described with reference to the accompanying drawings, however, the present utility model may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present utility model and fully convey the scope of the utility model to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the utility model. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the utility model provides a device for measuring the pulse current partial discharge distribution of an insulator, as shown in fig. 1, comprising: the device comprises an armored power frequency experiment transformer, an experiment tool and a measurement system;
the armored power frequency experiment transformer is connected with the experiment tool and is used for applying voltages to the test object unit and the reference unit in the experiment tool, the measuring system is connected with the test object unit and the reference unit in the experiment tool, and after the armored power frequency experiment transformer is used for applying voltages to the test object unit and the reference unit in the experiment tool, the measuring system measures pulse current partial discharge of the test object unit for distribution measurement.
The highest applied voltage of the armored power frequency experimental transformer is 120kV.
Wherein SF6 gas with absolute pressure of 0.4MPa is filled in the experimental fixture.
Wherein, the sample unit is 126kV disc insulator.
The test unit and the reference unit are electrically isolated from other parts of the experimental tool.
Wherein the reference unit is a matched capacitor.
Wherein, measurement system includes: detection resistor Z 1 Detection resistor Z 2 A UHF sensor 1 and a UHF sensor 2;
the detection resistor Z 1 The test sample unit is connected with the ground, and the detection resistor Z 2 A reference unit is connected and grounded, and the detection resistor Z 1 And a detection resistor Z 2 Measuring pulse current partial discharge of the sample unit based on a distributed pulse current measurement method;
the UHF sensor 1 and the UHF sensor 2 are connected with a reference unit, the UHF sensor 1 is arranged near a flange of the reference unit in the experimental tool, the UHF sensor 2 is arranged outside the experimental tool, and the UHF sensor 1 and the UHF sensor 2 measure pulse current partial discharge of a sample unit based on an ultrahigh frequency method;
wherein the measurement system further comprises: the photomultiplier is placed at a quartz observation window outside the experimental tool, and whether pulse current partial discharge occurs or not is observed through quartz glass.
The device provided by the utility model consists of an armored experimental transformer, an experimental tool and a measuring system.
The highest applied voltage of the armored power frequency experimental transformer is 120kV; the experimental fixture is filled with SF6 gas with absolute pressure of 0.4MPa, and a 126kV disc insulator is adopted as a sample; the measuring system consists of a distributed pulse current measuring method, an ultrahigh frequency method and an optical measuring method, and the effectiveness of each method is verified through mutual comparison.
The distributed pulse current measurement method comprises 2 pulse current measurement units, namely a sample unit and a reference unit, and the sample unit, the reference unit and other parts of the shell of the experimental tool are electrically isolated so as to meet the pulse current distribution measurement principle. The test unit comprises a disc insulator test sample, and the impedance Z is detected 1 And (3) grounding, and further suppressing space coupling interference by adopting a shielding box. The reference unit is used for setting a matching capacitor in the experimental tool and detecting impedance Z 2 And (5) grounding.
The ultra-high frequency method comprises 2 UHF sensors, the bandwidth of an amplifier is 250-800 MHz, and the gain is 50dB. The UHF sensor 1 is arranged near the insulator sample flange in the shielding box, and the UHF sensor 2 is arranged outside the shielding box.
The light measurement method adopts a photomultiplier to measure partial discharge, a quartz observation window is arranged on a cover plate at the top of the sample unit, and whether partial discharge occurs on the surface of the insulator sample is observed through quartz glass during experiments.
The distributed pulse current measurement method has the basic principle that the concentrated measurement of original pulse current partial discharge signals is changed into the separate measurement of each sample, the amplitude of the partial discharge signals is improved, the amplitude of interference signals is reduced, the signal to noise ratio is improved, the partial discharge signals and external interference signals are distinguished by comparing the amplitudes of the partial discharge pulse signals of each sample, the identification of single pulse partial discharge signals is realized, the electromagnetic shielding is adopted to greatly inhibit external noise, and then the high-sensitivity measurement of the pulse current method partial discharge signals is realized.
The principle of the distributed pulse current measurement method is shown in figure 2, C 1 Branch and C 2 The branch is two distributed measuring branches, Z 1 And Z 2 For corresponding detection impedance, C 1 For the equivalent capacitance of the test sample unit, C 2 For reference cell equivalent capacitance, C 0 Z is the tool capacitance s To protect the resistance, where C 1 And C 2 Comparable in size and much smaller than C 0 。
In FIG. 2 (a), for C 1 The generated partial discharge current will all be detected from the impedance Z according to the circuit principle 1 Through and flow overQuilt C 0 、C 2 Two branches are split, wherein, because of C 0 ＞＞C 2 Most of the current will be C 0 Branch flow through C 2 The partial discharge current of the branch is small, so Z 1 The amplitude of the detected partial discharge pulse current signal is far greater than Z 2 The directions are opposite. Similarly, for C 2 Partial discharge generated, Z 2 The amplitude of the detected partial discharge pulse current signal is far greater than Z 1 The directions are opposite.
In FIG. 2 (b), when U, Z s When any branch generates external interference signal, the interference signal current will be C 0 、C 1 、C 2 Three branches are split, wherein, due to C 0 Far greater than C 1 And C 2 Most of the current will be C 0 Branch circuit is divided to effectively inhibit the flow through C 1 、C 2 Interference signal of branch circuit, noise is reduced, and Z 1 And Z 2 The detected interference signal currents have the same magnitude and the same direction.
Therefore, according to the theoretical analysis, the distributed pulse current measurement method can effectively improve the signal-to-noise ratio of the partial discharge measurement and simultaneously compare Z 1 、Z 2 The measured amplitude and direction of the pulse current signal can be distinguished from C 1 Partial discharge C 2 The generated partial discharge and external interference signals, and then the defects are identified.
If the pulse amplitude detected by the UHF sensor 1 is obviously larger than that of the UHF sensor 2, the pulse amplitude is the partial discharge signal of the sample unit, otherwise, the pulse amplitude is the external interference signal, and whether the partial discharge signal and the interference signal are distinguished by the distributed pulse current measurement method is correct or not is checked. When the optical measurement method detects the partial discharge signal, the partial discharge generated by the sample unit is certain, and for the external interference signal, the optical measurement method cannot detect any signal, and the comparison and verification is carried out to determine whether the partial discharge signal and the interference signal are correctly distinguished by the distributed pulse current measurement method. In theory, the photometry has higher sensitivity, and can observe single photons generated by partial discharge, but is limited by detection viewing angles and distances, and when photons generated by partial discharge are blocked or the position of the partial discharge is not in the detection range, the photometry may fail.
The utility model can be used for detecting the high-sensitivity signal of the partial discharge of the insulator, identifying the partial discharge of 0.1pC and quantitatively giving out the degradation degree of the defect, effectively evaluating the running state of the GIS equipment, providing a reference basis for the detection and maintenance strategy of the GIS equipment and improving the power supply reliability of the GIS equipment.
It will be appreciated by those skilled in the art that embodiments of the present utility model may be provided as a method, system, or computer program product. Accordingly, the present utility model may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present utility model may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the utility model can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present utility model is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the utility model. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. An apparatus for insulator pulse current partial discharge distribution measurement, the apparatus comprising: the device comprises an armored power frequency experiment transformer, an experiment tool and a measurement system;
the armored power frequency experiment transformer is connected with the experiment tool and is used for applying voltage to the test object unit and the reference unit in the experiment tool, the measuring system is connected with the test object unit and the reference unit in the experiment tool, after the armored power frequency experiment transformer is used for applying voltage to the test object unit and the reference unit in the experiment tool, the measuring system is used for measuring pulse current partial discharge of the test object unit for distribution measurement, and the test object unit is a disc insulator.
2. The apparatus of claim 1, wherein the armored power frequency laboratory transformer has a maximum applied voltage of 120kV.
3. The device according to claim 1, wherein the inside of the experimental fixture is filled with SF6 gas with an absolute pressure of 0.4 MPa.
4. The apparatus of claim 1, wherein the sample unit and the reference unit are electrically isolated from other parts of the experimental fixture.
5. The apparatus of claim 1, wherein the reference cell is a matched capacitor.
6. The apparatus of claim 1, wherein the measurement system comprises: detection resistor Z 1 Detection resistor Z 2 A UHF sensor 1 and a UHF sensor 2;
the detection resistor Z 1 The test sample unit is connected with the ground, and the detection resistor Z 2 A reference unit is connected and grounded, and the detection resistor Z 1 And a detection resistor Z 2 Measuring pulse current partial discharge of the sample unit based on a distributed pulse current measurement method;
the UHF sensor 1 and the UHF sensor 2 are connected with the reference unit, the UHF sensor 1 is arranged near a flange of the reference unit inside the experimental tool, the UHF sensor 2 is arranged outside the experimental tool, and the UHF sensor 1 and the UHF sensor 2 measure pulse current partial discharge of the sample unit based on an ultrahigh frequency method.
7. The apparatus of claim 6, wherein the measurement system further comprises: the photomultiplier is placed at a quartz observation window outside the experimental tool, and whether pulse current partial discharge occurs or not is observed through quartz glass.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320643760.9U CN219777843U (en) | 2023-03-28 | 2023-03-28 | Device for measuring pulse current partial discharge distribution of insulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320643760.9U CN219777843U (en) | 2023-03-28 | 2023-03-28 | Device for measuring pulse current partial discharge distribution of insulator |
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| CN219777843U true CN219777843U (en) | 2023-09-29 |
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| CN202320643760.9U Active CN219777843U (en) | 2023-03-28 | 2023-03-28 | Device for measuring pulse current partial discharge distribution of insulator |
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