CN111983401A - Method and device for obtaining equivalent relation curve of discharge capacity and signal amplitude - Google Patents
Method and device for obtaining equivalent relation curve of discharge capacity and signal amplitude Download PDFInfo
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- CN111983401A CN111983401A CN202010826762.2A CN202010826762A CN111983401A CN 111983401 A CN111983401 A CN 111983401A CN 202010826762 A CN202010826762 A CN 202010826762A CN 111983401 A CN111983401 A CN 111983401A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000009413 insulation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 230000005684 electric field Effects 0.000 description 1
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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
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
- G01R13/02—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
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Abstract
The invention discloses a method and a device for acquiring an equivalent relation curve of discharge capacity and signal amplitude, relates to the field of power equipment, and particularly relates to a method and a device for acquiring an equivalent relation curve of discharge capacity and signal amplitude by gradually acquiring the equivalent discharge capacity and the equivalent amplitude through a signal generator, a high-frequency pulse sensor, a three-way joint, an oscilloscope, an electric pulse partial discharge instrument and the like, and fitting the relation curve of the discharge capacity and the equivalent amplitude according to the acquired equivalent data of the discharge capacity and the equivalent amplitude. After a technician uses the existing partial discharge detector to obtain one signal parameter (such as discharge amount) of a partial discharge signal, the signal parameter can be quickly converted into another signal parameter (such as amplitude value) by means of the relation curve, so that the technician can conveniently and directly compare and analyze data of the partial discharge detector with data of other partial discharge detectors.
Description
Technical Field
The invention relates to the field of power equipment, in particular to a method and a device for acquiring an equivalent relation curve of discharge capacity and signal amplitude.
Background
Partial discharge analysis refers to a test method for detecting whether partial discharge exists in the insulation of electrical equipment. If there are voids, bubbles, impurities, or external damage in the insulation of the high-voltage electrical equipment or there are defects on the insulating surfaces, partial discharge occurs when the electric field strength reaches a certain value. The existing partial discharge detector is just a device for detecting the insulativity of the power equipment, but because the models are different, the manufacturers are different or the requirements of customers are different, the existing partial discharge detector has the discharge capacity of collecting partial discharge signals and the amplitude of collecting partial discharge signals, so that data among various partial discharge detectors are difficult to compare with each other, great trouble is brought to the analysis of detection work, and therefore a scheme which can facilitate people to equivalently convert the discharge capacity and the amplitude needs to be developed.
Disclosure of Invention
The invention provides a method and a device for acquiring an equivalent relation curve of discharge capacity and signal amplitude, and aims to solve the problems in the prior art.
The technical scheme adopted by the invention is as follows:
a method for obtaining an equivalent relation curve of discharge capacity and signal amplitude comprises the following steps: 1. sleeving a high-frequency pulse sensor on a loop of a first signal wire of a signal generator; 2. the output end of the high-frequency pulse sensor is connected with a three-way joint; then connecting the electric pulse partial discharge instrument to one end of the three-way joint by using a second signal wire, and connecting the oscilloscope to the other end of the three-way joint by using a third signal wire; 3. adjusting the signal generator to enable the signal generator to send out different square wave signals; 4. sequentially recording the discharge quantity displayed on the electric pulse partial discharge instrument and the signal amplitude displayed on the corresponding oscilloscope; 5. and (4) drawing a two-dimensional coordinate graph of the discharge capacity and the signal amplitude according to the data recorded in the step (4), and fitting a relation curve of the discharge capacity and the signal amplitude.
Further, in step 3, the signal generator is adjusted to make the signal generator send square wave signals with the same amplitude and different frequencies.
Furthermore, in step 3, the unit amount of frequency change is preset, and the signal generator is adjusted by increasing the frequency of one unit amount each time; after the signal generator is adjusted once, recording the discharge capacity and the signal amplitude value according to the mode of the step 4 to form a group of data which can be represented by points in a two-dimensional coordinate graph; recording for multiple times to obtain multiple discrete data points; and in step 5, interpolating and drawing approximation on the data points to finally obtain a fitting curve representing the equivalent relation between the discharge capacity and the signal amplitude.
Further, the second signal line and the third signal line are signal lines with the same model and specification.
A device for acquiring the relation between the discharge capacity and the signal amplitude comprises a signal generator, a first signal line, a high-frequency pulse sensor, a second signal line, a third signal line, a three-way joint, an oscilloscope and an electric pulse partial discharge instrument, wherein the first signal line penetrates through the high-frequency pulse sensor, and two ends of the first signal line are connected to the signal generator to form a signal loop; the output end of the high-frequency pulse sensor is connected to the three-way joint, the electric pulse partial discharge instrument is connected to one end of the three-way joint through a second signal line, and the oscilloscope is connected to the other end of the three-way joint through a third signal line.
Further, the second signal line and the third signal line are signal lines with the same model and specification.
Compared with the prior art, the invention has the advantages that:
the invention can simultaneously obtain equivalent discharge capacity and amplitude by gradually using a signal generator, a high-frequency pulse sensor, a three-way joint, an oscilloscope, an electric pulse partial discharge instrument and the like, and fit a relation curve of the discharge capacity and the amplitude according to the obtained equivalent data of the discharge capacity and the amplitude. After a technician uses the existing partial discharge detector to obtain one signal parameter (such as discharge amount) of a partial discharge signal, the signal parameter can be quickly converted into another signal parameter (such as amplitude value) by means of the relation curve, so that the technician can conveniently and directly compare and analyze data of the partial discharge detector with data of other partial discharge detectors.
Drawings
Fig. 1 is a schematic structural diagram of an acquisition device according to the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings. Numerous details are set forth below in order to provide a thorough understanding of the present invention, but it will be apparent to those skilled in the art that the present invention may be practiced without these details.
As shown in fig. 1, an obtaining apparatus for relationship between discharge capacity and signal amplitude includes a signal generator 1, a first signal line 2, a high-frequency pulse sensor 3, a second signal line 5, a third signal line 7, a three-way joint 4, an oscilloscope 8 and an electric pulse partial discharge instrument 6, wherein the first signal line 2 passes through the high-frequency pulse sensor 3, and both ends of the first signal line 2 are connected to the signal generator 1 to form a signal loop; the output end of the high-frequency pulse sensor 3 is connected to the three-way joint 4, the electric pulse partial discharge instrument 6 is connected to one end of the three-way joint 4 through a second signal line 5, and the oscilloscope 8 is connected to the other end of the three-way joint 4 through a third signal line 7.
As shown in fig. 1, the second signal line 5 and the third signal line 7 are signal lines of the same model and specification.
As shown in fig. 1, a method for obtaining an equivalent relationship curve between a discharge capacity and a signal amplitude includes the following steps:
1. a high-frequency pulse sensor 3 is sleeved on a loop of a first signal wire 2 of a signal generator 1.
2. The output end of the high-frequency pulse sensor 3 is connected with a three-way joint 4; then, an electric pulse partial discharge instrument 6 is connected to one end of the three-way joint 4 by a second signal line 5, and an oscilloscope 8 is connected to the other end of the three-way joint 4 by a third signal line 7.
3. The signal generator 1 is adjusted so that the signal generator 1 emits different square wave signals. Specifically, in step 3, the signal generator 1 is adjusted to make the signal generator 1 emit square wave signals with the same amplitude and different frequencies. Then, another discharge quantity-signal amplitude relation curve is fitted by using the method of the step 4 and the step 5.
4. And sequentially recording the discharge quantity displayed on the electric pulse partial discharge instrument 6 and the signal amplitude displayed on the corresponding oscilloscope 8. When the signal generator 1 is adjusted, it is recorded once for each increase of the frequency by one unit
5. And (4) drawing a two-dimensional coordinate graph of the discharge capacity and the signal amplitude according to the data recorded in the step (4), and fitting a relation curve of the discharge capacity and the signal amplitude.
More specifically, in step 3, the unit amount of frequency change is preset, and the signal generator 1 is adjusted with a frequency increased by one unit amount at a time. And (4) recording the discharge quantity displayed on the electric pulse partial discharge instrument 6 and the signal amplitude displayed on the corresponding oscilloscope 8 according to the mode of the step 4 after the signal generator 1 is adjusted every time, and forming a group of data which can be represented by points on a two-dimensional coordinate graph of the discharge quantity and the signal amplitude. After the recording is carried out for multiple times, a plurality of discrete data points can be obtained in a two-dimensional coordinate graph of the discharge capacity and the signal amplitude; in step 5, interpolation and approximation drawing are carried out on the data points in the two-dimensional coordinate graph, and finally a fitting curve representing the equivalent relation between the discharge capacity and the signal amplitude is obtained.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (6)
1. A method for obtaining an equivalent relation curve of discharge capacity and signal amplitude is characterized by comprising the following steps: 1. sleeving a high-frequency pulse sensor on a loop of a first signal wire of a signal generator; 2. the output end of the high-frequency pulse sensor is connected with a three-way joint; then connecting the electric pulse partial discharge instrument to one end of the three-way joint by using a second signal wire, and connecting the oscilloscope to the other end of the three-way joint by using a third signal wire; 3. adjusting the signal generator to enable the signal generator to send out different square wave signals; 4. sequentially recording the discharge quantity displayed on the electric pulse partial discharge instrument and the signal amplitude displayed on the corresponding oscilloscope; 5. and (4) drawing a two-dimensional coordinate graph of the discharge capacity and the signal amplitude according to the data recorded in the step (4), and fitting a relation curve of the discharge capacity and the signal amplitude.
2. The method for obtaining the equivalent relation curve of the discharge capacity and the signal amplitude as claimed in claim 1, wherein: in the step 3, the signal generator is adjusted to enable the signal generator to send square wave signals with the same amplitude and different frequencies.
3. The method for obtaining the equivalent relation curve of the discharge capacity and the signal amplitude as claimed in claim 3, wherein: in step 3, presetting unit quantity of frequency change, and adjusting the signal generator by increasing the frequency of one unit quantity each time; after the signal generator is adjusted once, recording the discharge capacity and the signal amplitude value according to the mode of the step 4 to form a group of data which can be represented by points in a two-dimensional coordinate graph; recording for multiple times to obtain multiple discrete data points; and in step 5, interpolating and drawing approximation on the data points to finally obtain a fitting curve representing the equivalent relation between the discharge capacity and the signal amplitude.
4. The method for obtaining the equivalent relationship curve of the discharge capacity and the signal amplitude as claimed in claim 1 or 2, wherein: the second signal wire and the third signal wire are signal wires with the same model and specification.
5. An apparatus for obtaining the relationship between the discharge capacity and the signal amplitude is characterized in that: the high-frequency pulse signal acquisition device comprises a signal generator, a first signal wire, a high-frequency pulse sensor, a second signal wire, a third signal wire, a three-way joint, an oscilloscope and an electric pulse partial discharge instrument, wherein the first signal wire penetrates through the high-frequency pulse sensor, and two ends of the first signal wire are connected to the signal generator to form a signal loop; the output end of the high-frequency pulse sensor is connected to the three-way joint, the electric pulse partial discharge instrument is connected to one end of the three-way joint through a second signal line, and the oscilloscope is connected to the other end of the three-way joint through a third signal line.
6. The apparatus for obtaining the relationship between the discharge capacity and the signal amplitude as claimed in claim 4, wherein: the second signal wire and the third signal wire are signal wires with the same model and specification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010826762.2A CN111983401A (en) | 2020-08-17 | 2020-08-17 | Method and device for obtaining equivalent relation curve of discharge capacity and signal amplitude |
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| CN202010826762.2A CN111983401A (en) | 2020-08-17 | 2020-08-17 | Method and device for obtaining equivalent relation curve of discharge capacity and signal amplitude |
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| CN111983401A true CN111983401A (en) | 2020-11-24 |
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| CN202010826762.2A Pending CN111983401A (en) | 2020-08-17 | 2020-08-17 | Method and device for obtaining equivalent relation curve of discharge capacity and signal amplitude |
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Citations (7)
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|---|---|---|---|---|
| CN104237759A (en) * | 2014-10-22 | 2014-12-24 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Discharge intensity detecting system and method for power transmission and transformation device |
| CN105203930A (en) * | 2015-09-10 | 2015-12-30 | 国家电网公司 | Partial discharge test platform and method for high-voltage switch cabinet |
| CN105319524A (en) * | 2015-11-16 | 2016-02-10 | 国家电网公司 | A high tension switchgear partial discharge live detection effectiveness judgment method |
| KR20170019831A (en) * | 2015-08-13 | 2017-02-22 | 한국수력원자력 주식회사 | Partial Discharge Defects Diagnostic System |
| CN209432990U (en) * | 2018-12-05 | 2019-09-24 | 华乘电气科技股份有限公司 | A kind of high-frequency current Partial discharge detector performance automatic checkout system |
| CN111225355A (en) * | 2019-12-24 | 2020-06-02 | 上海智光电力技术有限公司 | Signal acquisition sensor, and signal processing method and device |
| CN111537936A (en) * | 2020-06-11 | 2020-08-14 | 国网宁夏电力有限公司电力科学研究院 | High-frequency partial discharge signal reconstruction method and system |
-
2020
- 2020-08-17 CN CN202010826762.2A patent/CN111983401A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237759A (en) * | 2014-10-22 | 2014-12-24 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Discharge intensity detecting system and method for power transmission and transformation device |
| KR20170019831A (en) * | 2015-08-13 | 2017-02-22 | 한국수력원자력 주식회사 | Partial Discharge Defects Diagnostic System |
| CN105203930A (en) * | 2015-09-10 | 2015-12-30 | 国家电网公司 | Partial discharge test platform and method for high-voltage switch cabinet |
| CN105319524A (en) * | 2015-11-16 | 2016-02-10 | 国家电网公司 | A high tension switchgear partial discharge live detection effectiveness judgment method |
| CN209432990U (en) * | 2018-12-05 | 2019-09-24 | 华乘电气科技股份有限公司 | A kind of high-frequency current Partial discharge detector performance automatic checkout system |
| CN111225355A (en) * | 2019-12-24 | 2020-06-02 | 上海智光电力技术有限公司 | Signal acquisition sensor, and signal processing method and device |
| CN111537936A (en) * | 2020-06-11 | 2020-08-14 | 国网宁夏电力有限公司电力科学研究院 | High-frequency partial discharge signal reconstruction method and system |
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