CN108845282B - Calibration device and method for GIS/GIL partial discharge diagnosis - Google Patents
Calibration device and method for GIS/GIL partial discharge diagnosis Download PDFInfo
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- CN108845282B CN108845282B CN201810665311.8A CN201810665311A CN108845282B CN 108845282 B CN108845282 B CN 108845282B CN 201810665311 A CN201810665311 A CN 201810665311A CN 108845282 B CN108845282 B CN 108845282B
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- 208000028659 discharge Diseases 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000003745 diagnosis Methods 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 36
- 229910052751 metal Inorganic materials 0.000 claims abstract description 36
- 230000005291 magnetic effect Effects 0.000 claims description 19
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 3
- 230000005294 ferromagnetic effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012502 risk assessment Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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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
- G01R31/1209—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 using acoustic measurements
-
- 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
- G01R31/1254—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 of gas-insulated power appliances or vacuum gaps
-
- 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
- G01R31/1263—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention provides a calibration device for GIS/GIL partial discharge diagnosis, which comprises an electromagnet, a metal ball and a supporting and controlling circuit. The electromagnet is placed in the support, a through hole is formed in the support, and the metal ball is placed in the through hole. The control circuit is connected with the electromagnet and controls the electromagnet to act, and the metal ball is driven by the electromagnet to do reciprocating motion. The invention also provides a calibration method for GIS/GIL partial discharge diagnosis. The calibration device and the calibration method provided by the invention can generate the ultrasonic signals for calibration with good consistency, have simple structure and convenient use, and can meet the calibration requirements of the acoustic emission sensor for partial discharge diagnosis.
Description
Technical Field
The invention belongs to the technical field of high voltage tests, and particularly relates to a calibration device and method for GIS/GIL partial discharge diagnosis.
Background
Metal particles may be generated by poor processing technology, mechanical friction during transportation, opening and closing operations of electrical components, and damage to electrodes caused by spark discharge during operation of a Gas Insulated Switchgear (GIS) and a gas insulated transmission line (GIL) in a product manufacturing process. Therefore, contamination of the metal particles inside the GIS/GIL is inevitable. According to the statistics of the CIGRE 33/23.12 working group of the international large power grid conference, the insulation failure caused by particles or foreign matters accounts for 20% of all insulation failure faults. Under the influence of an external electric field or mechanical vibration, particles or foreign matters may move in the GIS/GIL device, and abnormal discharge may be induced when an ultra-fast transient overvoltage comes. The defect of free conductive particles in the GIS/GIL is one of the biggest threats to the normal operation of the GIS/GIL equipment, and the detection and identification method is a problem to be solved urgently for improving the operation reliability of the GIS/GIL equipment.
In order to ensure the high reliable operation of GIS/GIL equipment, the standard (GB7674-2008 rated voltage 72.5kV and above gas insulated metal enclosed switchgear) stipulates that for GIS/GIL equipment with the rated voltage of 252kV and above, after a power frequency short-time tolerance test is carried out during on-site handover, a power frequency partial discharge test should be carried out additionally.
At the end of the last century, Lundgaard, a scholars, for the first time, proposed the use of acoustic emission sensors as detection devices to diagnose partial discharge faults in electrical equipment, including GIS/GILs. Later, scholars Holmberg, Runde et al used this type of sensor to perform risk assessment and other studies on 6IS/GIL devices. The acoustic emission sensor is used for calibrating the sensor, namely calibrating the direct proportion relation between the ultrasonic signal amplitude and the particle collision momentum collected by the acoustic emission sensor.
The calibration methods adopted by the scholars before can calibrate the sensitivity of the ultrasonic measurement system by using a free-fall collision rebound experiment. The method comprises the following steps: a metal sphere of known mass was released manually and an oscilloscope was used to acquire the ultrasonic signal generated by the collision of the metal sphere with the 6IS/GIL housing. The sensitivity of the acoustic emission sensor can be obtained by calculating the amplitude and the interval time of the acquired ultrasonic signals. Due to manual release, the calibration method has the defects of poor standard signal consistency and difficulty in operation, and therefore, the calibration method cannot be widely used in a test field.
For this reason, due to the lack of quantitative relationship between the severity of the defect of the free conductive particles and the signal of the acoustic emission sensor, it is necessary to design a calibration device of the acoustic emission sensor for diagnosing partial discharge of the gas insulated closed combined electrical appliance and the gas insulated transmission line, so as to help researchers in the field to calibrate the sensitivity of the acoustic emission sensor.
Disclosure of Invention
The invention provides a calibration device and a calibration method for GIS/GIL partial discharge diagnosis to overcome the defects or shortcomings of the prior art, and aims to solve the problem of consistency of calibration signals of an acoustic emission sensor in a partial discharge test site.
The technical scheme adopted by the invention is that the calibration device for GIS/GIL partial discharge diagnosis comprises an electromagnet, a metal ball and a supporting and controlling circuit. The electromagnet is placed in the support, a through hole is formed in the support, and the metal ball is placed in the through hole. The control circuit is connected with the electromagnet and controls the electromagnet to act, and the metal ball is driven by the electromagnet to do reciprocating motion.
Preferably, the control circuit comprises a signal generating circuit and a relay, and the signal generating circuit generates a square wave signal with a certain frequency and a certain duty ratio to drive the on-off of the relay.
Preferably, the electromagnet is an electromagnet with a sucker, and the working voltage is 5V.
Preferably, the outer diameter of the electromagnet is 20mm, the diameter of the sucker is 8mm, the height of the sucker is 15mm, the power of the sucker is 2.5W, and the suction force of the sucker is 25N.
Preferably, the metal ball is a ferromagnetic metal ball, and the diameter of the ball body is 1.5 mm.
Preferably, the support is fused deposition additive manufactured, 20mm in diameter and 5mm in height.
Preferably, the diameter of the through hole is 2 mm.
Preferably, the signal generating circuit is a multivibrator formed by a 555 timer integrated circuit, the frequency is 0.2HZ, and the duty ratio is 0.1.
Preferably, the relay is a direct current relay, and the working voltage is 5V.
The invention also provides a calibration method for GIS/GIL partial discharge diagnosis, which comprises the following steps: and a 5V mobile power supply is adopted to supply power to the control circuit, the control circuit is conducted, at the moment, the signal generating circuit generates a square wave signal with certain frequency and duty ratio to drive the relay to be switched on and off, the relay controls the electromagnet to generate magnetic force or eliminate the magnetic force, and the metal ball reciprocates under the drive of the magnetic force. When the electromagnet generates magnetic force, the metal ball is attracted to the electromagnet sucker. When the electromagnet eliminates the magnetic force, the metal ball falls from the sucking disc and collides with the GIS/GIL shell to generate a standard ultrasonic signal.
Compared with the prior art, the invention has the following beneficial effects: the calibration device and the calibration method provided by the invention can generate the ultrasonic signals for calibration with good consistency, have simple structure and convenient use, and can meet the calibration requirements of the acoustic emission sensor for partial discharge diagnosis.
Drawings
FIG. 1 is a schematic structural diagram of a calibration device according to the present invention;
in the figure, 1 electromagnet; 2, a metal ball; 3, supporting; 4 a control circuit.
Detailed Description
The invention is described in detail below with reference to the drawings and examples, but the invention is not limited thereto.
As shown in figure 1, the calibration device for GIS/GIL partial discharge diagnosis provided by the invention comprises an electromagnet 1, a metal ball 2, a support 3 and a control circuit 4. The electromagnet 1 is placed in the support 3, a through hole is formed in the support 3, and the metal ball 2 is placed in the through hole. The control circuit 4 is connected with the electromagnet and controls the electromagnet to act, and the metal ball 2 is driven by the electromagnet 1 to do reciprocating motion. The control circuit 4 comprises a signal generating circuit and a relay, the signal generating circuit generates square wave signals with certain frequency and duty ratio to drive the relay to be switched on and off, the relay controls the electromagnet to generate magnetic force or eliminate the magnetic force, and the metal ball reciprocates under the drive of the magnetic force and collides with the GIS/GIL shell to generate standard ultrasonic signals.
In a preferred embodiment, in order to make the metal ball do reciprocating motion under the driving of magnetic force better, the electromagnet 1 adopts an electromagnet with a sucker, and the working voltage is 5V.
In a preferred embodiment, the outer diameter of the electromagnet is 20mm, the diameter of the suction cup is 8mm, the height of the suction cup is 15mm, the power of the suction cup is 2.5W, and the suction force of the suction cup is 25N.
In a preferred embodiment, the metal balls 2 are ferromagnetic metal balls, the ball diameter being 1.5 mm. Further, the main material of the metal sphere body may preferably be iron.
In a preferred embodiment, in order to provide the support 3 with good mechanical properties, the support 3 is manufactured by fused deposition additive manufacturing and has a diameter of 20mm and a height of 5 mm.
In a preferred embodiment, the diameter of the through hole is larger than the diameter of the metal sphere body, preferably 2 mm.
In a preferred embodiment, the signal generating circuit is a multivibrator formed by a 555 timer integrated circuit, the frequency is 0.2Hz, and the duty ratio is 0.1.
In a preferred embodiment, the relay is a dc relay, and the operating voltage is 5V.
In a preferred embodiment, the calibration device provided by the invention adopts a 5V mobile power supply to supply power to the control circuit.
The invention provides a calibration method for GIS/GIL partial discharge diagnosis, which comprises the steps of adopting a 5V mobile power supply to supply power to a control circuit, conducting the control circuit, generating a square wave signal with certain frequency and duty ratio by a signal generating circuit to drive a relay to be switched on and off, controlling an electromagnet to generate magnetic force or eliminating the magnetic force by the relay, and enabling a metal ball to reciprocate under the driving of the magnetic force. When the electromagnet generates magnetic force, the metal ball is attracted to the electromagnet sucker. When the electromagnet eliminates the magnetic force, the metal ball falls from the sucking disc and collides with the GIS/GIL shell to generate a standard ultrasonic signal.
The above description is only a preferred embodiment of the present invention and should not be interpreted as limiting the scope of the present invention, it should be noted that those skilled in the art can make various changes and modifications without departing from the spirit of the present invention, and these changes and modifications should fall within the protection scope of the present invention.
Claims (10)
1. A calibration device for GIS/GIL partial discharge diagnosis is characterized in that,
the device comprises an electromagnet (1), a metal ball (2), a support (3) and a control circuit (4);
the electromagnet (1) is placed in the support (3), a through hole is formed in the support (3), and the metal ball (2) is placed in the through hole; the control circuit (4) is connected with the electromagnet and controls the electromagnet to act;
the metal ball (2) is driven by the electromagnet (1) to do reciprocating motion;
the device can generate ultrasonic signals for calibration with good consistency, and can meet the calibration requirements of the acoustic emission sensor for partial discharge diagnosis.
2. Calibration arrangement according to claim 1,
the control circuit (4) comprises a signal generating circuit and a relay, wherein the signal generating circuit generates square wave signals with certain frequency and duty ratio to drive the relay to be switched on and off.
3. Calibration arrangement according to claim 1,
the electromagnet (1) is an electromagnet with a sucker, and the working voltage is 5V.
4. Calibration arrangement according to claim 3,
the outer diameter of the electromagnet is 20mm, the diameter of the sucker is 8mm, the height of the sucker is 15mm, the power of the sucker is 2.5W, and the suction force of the sucker is 25N.
5. Calibration arrangement according to claim 1,
the metal ball (2) is a ferromagnetic metal ball, and the diameter of the metal ball (2) is 1.5 mm.
6. Calibration arrangement according to claim 1,
the support (3) is manufactured by fused deposition additive manufacturing, and has a diameter of 20mm and a height of 5 mm.
7. Calibration arrangement according to claim 1,
the diameter of the through hole is 2 mm.
8. Calibration arrangement according to claim 2,
the signal generating circuit is a multivibrator formed by a 555 timer integrated circuit, the frequency is 0.2HZ, and the duty ratio is 0.1.
9. Calibration arrangement according to claim 2,
the relay is a direct current relay, and the working voltage is 5V.
10. A calibration method for a calibration apparatus for the GIS/GIL partial discharge diagnosis of any one of claims 2, 8, 9, said method comprising:
a 5V mobile power supply is adopted to supply power to the control circuit, the control circuit is conducted, at the moment, the signal generating circuit generates a square wave signal with certain frequency and duty ratio to drive the relay to be switched on and off, the relay controls the electromagnet to generate magnetic force or eliminate the magnetic force, and the metal ball reciprocates under the driving of the magnetic force;
when the electromagnet generates magnetic force, the metal ball is attracted to the electromagnet sucker; when the electromagnet eliminates the magnetic force, the metal ball falls from the sucking disc and collides with the GIS/GIL shell to generate a standard ultrasonic signal.
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| CN201810665311.8A CN108845282B (en) | 2018-06-25 | 2018-06-25 | Calibration device and method for GIS/GIL partial discharge diagnosis |
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| CN201810665311.8A CN108845282B (en) | 2018-06-25 | 2018-06-25 | Calibration device and method for GIS/GIL partial discharge diagnosis |
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| CN108845282A CN108845282A (en) | 2018-11-20 |
| CN108845282B true CN108845282B (en) | 2020-08-25 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110187245B (en) * | 2019-05-27 | 2023-09-05 | 中国电力科学研究院有限公司 | Device and method for testing low-voltage side performance of GIL three-post insulator |
| CN111460706B (en) * | 2020-03-19 | 2023-06-06 | 国网江苏省电力有限公司电力科学研究院 | GIL pipe gallery on-line monitoring and temperature state distinguishing method and system |
| CN112378834B (en) * | 2020-10-23 | 2023-06-02 | 国网江苏省电力有限公司检修分公司 | Method for monitoring metal particles in GIL by using vibration/acoustic signals |
| CN117434163B (en) * | 2023-12-20 | 2024-04-16 | 中煤科工开采研究院有限公司 | Calibration device and method for acoustic emission sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507397A (en) * | 2011-11-22 | 2012-06-20 | 云南电力试验研究院（集团）有限公司电力研究院 | Acousto-electric jointed direct current detection method for metal electric conductive particles in GIS |
| CN103207376A (en) * | 2013-03-05 | 2013-07-17 | 广东电网公司电力科学研究院 | Calibration method and device for gas insulated switchgear (GIS) partial discharge ultrasonic detection device |
| CN204719221U (en) * | 2015-06-12 | 2015-10-21 | 深圳供电局有限公司 | A kind of caliberating device of high-frequency local discharging sensor |
| CN106842092A (en) * | 2016-12-12 | 2017-06-13 | 国网北京市电力公司 | Sensor Frequency Response scaling method and device in live testing apparatus for local discharge |
-
2018
- 2018-06-25 CN CN201810665311.8A patent/CN108845282B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507397A (en) * | 2011-11-22 | 2012-06-20 | 云南电力试验研究院（集团）有限公司电力研究院 | Acousto-electric jointed direct current detection method for metal electric conductive particles in GIS |
| CN103207376A (en) * | 2013-03-05 | 2013-07-17 | 广东电网公司电力科学研究院 | Calibration method and device for gas insulated switchgear (GIS) partial discharge ultrasonic detection device |
| CN204719221U (en) * | 2015-06-12 | 2015-10-21 | 深圳供电局有限公司 | A kind of caliberating device of high-frequency local discharging sensor |
| CN106842092A (en) * | 2016-12-12 | 2017-06-13 | 国网北京市电力公司 | Sensor Frequency Response scaling method and device in live testing apparatus for local discharge |
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