CN111880136A - Partial discharge calibration method for power cable high-frequency partial discharge online monitoring - Google Patents
Partial discharge calibration method for power cable high-frequency partial discharge online monitoring Download PDFInfo
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- CN111880136A CN111880136A CN202010667813.1A CN202010667813A CN111880136A CN 111880136 A CN111880136 A CN 111880136A CN 202010667813 A CN202010667813 A CN 202010667813A CN 111880136 A CN111880136 A CN 111880136A
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- G—PHYSICS
- G01—MEASURING; TESTING
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Abstract
The invention relates to a partial discharge calibration method for on-line monitoring of high-frequency partial discharge of a power cable, which comprises the following steps: the method comprises the following steps that 1, an oscillatory wave partial discharge test is carried out based on an oscillatory wave partial discharge detection system, and accurate partial discharge amount is displayed through a display control unit of the oscillatory wave partial discharge detection system; the partial discharge detection system based on the oscillation wave is connected with one end of the tested cable; and 2, serially connecting a high-frequency current sensor of the high-frequency partial discharge online monitoring system to the other end of the tested cable, and calibrating the partial discharge of the high-frequency partial discharge online monitoring system based on the partial discharge obtained by the oscillation wave partial discharge test. The method can make up for the defect that the high-frequency partial discharge online monitoring system cannot quantify the partial discharge, and uses the apparent partial discharge obtained by the oscillatory wave partial discharge test for comparing and calibrating the partial discharge of the high-frequency partial discharge online monitoring system, thereby increasing the precision of the high-frequency partial discharge online monitoring system and facilitating monitoring personnel to visually know the numerical value of the partial discharge.
Description
Technical Field
The invention belongs to the technical field of power cables, and particularly relates to a partial discharge calibration method for on-line monitoring of high-frequency partial discharge of a power cable.
Background
After the cable is put into operation, the cable is subjected to the action of electricity, heat, machinery and chemistry and is gradually aged. Minor defects in manufacturing and construction also develop and deteriorate with operating time. Since the cable is in a cable trench, even buried underground, once a problem occurs, it is difficult to find and process the cable. Meanwhile, due to the fact that long time is needed for ordering and replacing the cables, ordering needs to be carried out according to the length, the ordering and production period is long, and repair is difficult to carry out in a short time. The traditional test means represented by insulation resistance and alternating current-direct current withstand voltage is difficult to effectively find the insulation defect of the high-voltage cable, and research institutions at home and abroad are actively researching more effective new technology and new method, and some methods have already been successfully applied. However, the insulation defects of the high-voltage cable are caused by various reasons, such as external force damage during installation and unqualified manufacturing process, impurities remained in the insulation material, insulation aging caused by electric effect and thermal effect, and potential defects are difficult to find timely and effectively by using only one detection method. With the rapid development of high-speed processing chips, communication technologies and sensor technologies, online monitoring and live detection are widely applied to the health condition assessment of electrical equipment due to the advantages of no need of power failure, consistent distribution and running state of an electric field in the equipment and the like.
When the detected partial discharge signal needs to be calibrated, the prior art generally adopts a terminal calibration method, a coupler calibration method and a hybrid calibration method. The basic principle of the three methods is that a square wave signal is firstly applied to a cable to be measured to generate a quantitative standard charge with a known value, and the amplitude is observed and recorded by an oscilloscope. The end calibration method has a major problem in that when injecting a pulse signal into a cable, it is necessary to inject the pulse signal from the end of the cable, and it is difficult to inject the pulse signal from the end of the cable in the field, so that the method is only suitable for off-line calibration, and is not suitable for on-line calibration. Compared with the end calibration method, the coupler calibration method and the hybrid calibration method have larger errors in the actual measurement calibration process, mainly because the influence of stray capacitance on signal detection is not considered in the two methods, and the semi-conducting layer of the cable also has great influence on transmission of ultrahigh frequency signals. Meanwhile, two sensors are used in the two methods, and the difference of the sensor performance can greatly influence the calibration effect.
Disclosure of Invention
The invention aims to provide a partial discharge calibration method for power cable high-frequency partial discharge online monitoring, which is characterized in that a high-frequency current sensor of a high-frequency partial discharge online monitoring system is connected to the other end of a tested cable in series, and is compared with the accurate partial discharge in an oscillatory wave display control unit and calibrated, so that the partial discharge of the high-frequency partial discharge online monitoring system in the later period can be quantized, and the accuracy of the high-frequency partial discharge online monitoring system is improved.
The invention provides a partial discharge calibration method for on-line monitoring of high-frequency partial discharge of a power cable, which comprises the following steps:
the method comprises the following steps that 1, an oscillatory wave partial discharge test is carried out based on an oscillatory wave partial discharge detection system, and accurate partial discharge amount is displayed through a display control unit of the oscillatory wave partial discharge detection system; the partial discharge detection system based on the oscillation wave is connected with one end of the tested cable;
and 2, serially connecting a high-frequency current sensor of the high-frequency partial discharge online monitoring system to the other end of the tested cable, and calibrating the partial discharge of the high-frequency partial discharge online monitoring system based on the partial discharge obtained by the oscillation wave partial discharge test.
Further, the oscillatory wave partial discharge detection system comprises a voltage divider, an inductor, a high-voltage power electronic switch, a display control unit, a filter and a PD coupling unit; one end of the tested cable is connected with the voltage divider, one path of the voltage divider is connected with the display control unit through the inductor and the power electronic switch, and the other path of the voltage divider is connected with the display control unit through the PD coupling unit and the filter.
Further, the high voltage power electronic switch is a semiconductor switch.
Further, the step 1 of performing the oscillatory wave partial discharge test based on the oscillatory wave partial discharge detection system includes:
the rectification element converts an alternating current power supply into a direct current power supply, when the amplitude of direct current voltage is adjusted to a preset value, the high-voltage power electronic switch is closed, the direct current power supply is withdrawn, meanwhile, a tested cable and the inductor form an LC damping oscillation circuit, oscillation wave voltage is generated, and partial discharge at the insulation defect of the cable is excited by the generated oscillation wave voltage signal.
By means of the scheme, the partial discharge calibration method for the power cable high-frequency partial discharge online monitoring can overcome the defect that the high-frequency partial discharge online monitoring system cannot quantify the partial discharge, the apparent partial discharge obtained by the oscillatory wave partial discharge test is used for comparing and calibrating the partial discharge of the high-frequency partial discharge online monitoring system, the precision of the high-frequency partial discharge online monitoring system is improved, and monitoring personnel can conveniently and visually know the numerical value of the partial discharge.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Drawings
FIG. 1 is a flow chart of the method for calibrating partial discharge of power cable for on-line monitoring of high-frequency partial discharge according to the present invention;
FIG. 2 is a block diagram of an oscillatory wave partial discharge test system of the present invention;
FIG. 3 is a structural diagram of an oscillatory wave partial discharge test system of a series high-frequency current sensor according to the present invention.
Reference numbers in the figures:
11-a tested cable;
21-a voltage divider; 22-an inductance; 23-high voltage power electronic switch; 24-a display control unit; 25-a filter; 26-PD coupling unit;
31-high frequency current sensor.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1 to fig. 3, the present embodiment provides a partial discharge calibration method for online monitoring of high-frequency partial discharge of a power cable, including the following steps:
step S1, performing an oscillatory wave partial discharge test based on the oscillatory wave partial discharge detection system, and displaying an accurate partial discharge amount through the display control unit 24 of the oscillatory wave partial discharge detection system; wherein, the partial discharge detection system is connected with one end of the tested cable 11 based on the oscillation wave;
step S2, the high-frequency current sensor 31 of the high-frequency partial discharge online monitoring system is connected in series to the other end of the tested cable 11, and the partial discharge of the high-frequency partial discharge online monitoring system is calibrated based on the partial discharge obtained by the oscillatory wave partial discharge test.
In the present embodiment, the oscillatory wave partial discharge detection system includes a voltage divider 21, an inductor 22, a high voltage power electronic switch 23, a display control unit 24, a filter 25, and a PD (partial discharge) coupling unit 26; one end of the tested cable 11 is connected with a voltage divider 21, one path of the voltage divider 21 is connected with a display control unit 24 through an inductor 22 and a power electronic switch 23, and the other path is connected with the display control unit 24 through a PD coupling unit 25 and a filter 26.
In the present embodiment, the high voltage power electronic switch 23 is a semiconductor switch.
In this embodiment, the step 1 of performing the oscillatory wave partial discharge test based on the oscillatory wave partial discharge detection system includes:
the rectification element converts an alternating current power supply into a direct current power supply, when the amplitude of direct current voltage is adjusted to a preset value, the high-voltage power electronic switch is closed, the direct current power supply is withdrawn, meanwhile, a tested cable and the inductor form an LC damping oscillation circuit, oscillation wave voltage is generated, and partial discharge at the insulation defect of the cable is excited by the generated oscillation wave voltage signal.
By the partial discharge calibration method for the power cable high-frequency partial discharge online monitoring, the defect that the high-frequency partial discharge online monitoring system cannot quantify the partial discharge can be overcome, the apparent partial discharge obtained by the oscillatory wave partial discharge test is used for comparing and calibrating the partial discharge of the high-frequency partial discharge online monitoring system, the precision of the high-frequency partial discharge online monitoring system is improved, and monitoring personnel can conveniently and visually know the numerical value of the partial discharge.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A partial discharge calibration method for power cable high-frequency partial discharge online monitoring is characterized by comprising the following steps:
the method comprises the following steps that 1, an oscillatory wave partial discharge test is carried out based on an oscillatory wave partial discharge detection system, and accurate partial discharge amount is displayed through a display control unit of the oscillatory wave partial discharge detection system; the partial discharge detection system based on the oscillation wave is connected with one end of the tested cable;
and 2, serially connecting a high-frequency current sensor of the high-frequency partial discharge online monitoring system to the other end of the tested cable, and calibrating the partial discharge of the high-frequency partial discharge online monitoring system based on the partial discharge obtained by the oscillation wave partial discharge test.
2. The partial discharge calibration method for the on-line monitoring of the high-frequency partial discharge of the power cable according to claim 1, wherein the oscillatory wave partial discharge detection system comprises a voltage divider, an inductor, a high-voltage power electronic switch, a display control unit, a filter and a PD coupling unit; one end of the tested cable is connected with the voltage divider, one path of the voltage divider is connected with the display control unit through the inductor and the power electronic switch, and the other path of the voltage divider is connected with the display control unit through the PD coupling unit and the filter.
3. The partial discharge calibration method for the on-line monitoring of the high-frequency partial discharge of the power cable as claimed in claim 2, wherein the high-voltage power electronic switch is a semiconductor switch.
4. The partial discharge calibration method for on-line monitoring of high-frequency partial discharge of a power cable according to claim 2, wherein the step 1 of performing the oscillatory wave partial discharge test based on the oscillatory wave partial discharge detection system comprises:
the rectification element converts an alternating current power supply into a direct current power supply, when the amplitude of direct current voltage is adjusted to a preset value, the high-voltage power electronic switch is closed, the direct current power supply is withdrawn, meanwhile, a tested cable and the inductor form an LC damping oscillation circuit, oscillation wave voltage is generated, and partial discharge at the insulation defect of the cable is excited by the generated oscillation wave voltage signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010667813.1A CN111880136A (en) | 2020-07-13 | 2020-07-13 | Partial discharge calibration method for power cable high-frequency partial discharge online monitoring |
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| CN202010667813.1A CN111880136A (en) | 2020-07-13 | 2020-07-13 | Partial discharge calibration method for power cable high-frequency partial discharge online monitoring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113109685A (en) * | 2021-05-26 | 2021-07-13 | 广东电网有限责任公司 | Cable oscillatory wave partial discharge detection equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565637A (en) * | 2011-12-12 | 2012-07-11 | 广东电网公司电力科学研究院 | Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement |
| CN202770953U (en) * | 2012-07-24 | 2013-03-06 | 江苏省电力公司电力科学研究院 | Partial discharge detector for oscillating wave of crosslinked cable |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565637A (en) * | 2011-12-12 | 2012-07-11 | 广东电网公司电力科学研究院 | Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement |
| CN202770953U (en) * | 2012-07-24 | 2013-03-06 | 江苏省电力公司电力科学研究院 | Partial discharge detector for oscillating wave of crosslinked cable |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113109685A (en) * | 2021-05-26 | 2021-07-13 | 广东电网有限责任公司 | Cable oscillatory wave partial discharge detection equipment |
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Application publication date: 20201103 |