CN112578247A - Cable oscillatory wave partial discharge measurement system - Google Patents
Cable oscillatory wave partial discharge measurement system Download PDFInfo
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- CN112578247A CN112578247A CN202011506878.4A CN202011506878A CN112578247A CN 112578247 A CN112578247 A CN 112578247A CN 202011506878 A CN202011506878 A CN 202011506878A CN 112578247 A CN112578247 A CN 112578247A
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- 230000003534 oscillatory effect Effects 0.000 title claims abstract description 75
- 238000005259 measurement Methods 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 123
- 238000004891 communication Methods 0.000 claims abstract description 62
- 238000004458 analytical method Methods 0.000 claims abstract description 26
- 230000003993 interaction Effects 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 8
- 230000006855 networking Effects 0.000 claims description 3
- 230000032683 aging Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 7
- 229920003020 cross-linked polyethylene Polymers 0.000 description 6
- 239000004703 cross-linked polyethylene Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000006378 damage Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 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
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a cable oscillatory wave partial discharge measurement system, which comprises an oscillatory wave test module, a communication module, a test result analysis module and a test result output module, wherein the oscillatory wave test module is used for testing the local discharge of a cable; wherein: the oscillatory wave test module is in communication connection with the communication module to realize information interaction; the communication module is in communication connection with the test result analysis module to realize information interaction; the test result analysis module is in communication connection with the test result output module to realize information interaction; according to the invention, the cable oscillatory wave partial discharge test is carried out through the oscillatory wave test module, fault positioning is realized, and the aging condition of the cable can be judged according to the obtained test result.
Description
Technical Field
The invention relates to the technical field of cable detection, in particular to a cable oscillatory wave partial discharge measurement system.
Background
In the last decade, crosslinked polyethylene (XLPE) power cables have been widely used in urban power grids due to their advantages of good insulating properties, easy manufacturing, convenient installation, safe and reliable power supply, and being beneficial to urban and industrial layouts. However, there are often problems with the raw materials or the manufacturing process during the manufacturing of the power cable, resulting in air gaps between the conductor and the insulating layer, impurities or semi-conductors protruding towards the insulating layer, and partial discharges are very likely to occur at these air gaps and at the tips of the impurities. In addition, there may be various defects during installation and operation of the power cable to generate partial discharge. Meanwhile, the crosslinked polyethylene (XLPE) power cable has poor discharge resistance, so that the insulation material is continuously aged under the long-term action of partial discharge, and finally, insulation breakdown is caused, thereby causing major accidents.
Statistics show that: cable accidents caused by cable aging, poor process, accessory quality and other reasons have a large proportion of all power failures, and the hidden local defects have increasingly serious harm to the reliability of the urban power grid along with the continuous increase of the cable running time. A user urgently needs to detect the latent defect of the cable and evaluate the insulation state of the cable so as to determine whether the cable can be continuously used or not and guarantee the safe operation of a power grid.
At present, the common test means are only insulation test and direct-current voltage withstand test, and these tests can only judge whether the cable is normal to a certain extent to draw a conclusion whether the cable can continue to operate, but cannot explain the aging degree of the cable, and can damage the insulation of the normally operable cable, so that the cable is broken down and completely discarded in the test. Therefore, how to judge the specific aging degree of the cable in the testing process without damaging the current good insulation is a very critical problem.
The cable oscillatory wave partial discharge test system has high integration level, simple test wiring and operation, low power consumption and light overall weight, can simultaneously complete the test, voltage resistance, fault location and dielectric loss of the cable partial discharge by once pressurization, and has obvious advantages compared with a power frequency alternating voltage test, so that the oscillatory wave detection technology is rapidly developed in recent years.
In the prior art, a chinese patent of invention with publication number CN105388401A discloses a novel cable oscillatory wave partial discharge detection system in 09/2016 03.s, which includes a dc high-voltage device, an IGBT high-voltage switch, a resonant inductor, a capacitive voltage divider, a monitoring background, a compensation capacitor, and a partial discharge pulse detector; and (6) the tested cable. Although the method improves the measurement precision by means of adding a compensation capacitor with an adjustable capacitance value, additionally arranging partial discharge pulse detectors at two ports of a cable and the like; however, the problem that the aging condition of the cable cannot be judged due to the difficulty in completing the partial discharge test and fault location of the cable is not solved, and therefore a cable oscillatory wave partial discharge measurement system is urgently needed.
Disclosure of Invention
The invention provides a cable oscillatory wave partial discharge measurement system for carrying out cable partial discharge test and fault location so as to judge the cable aging condition.
The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:
a cable oscillatory wave partial discharge measurement system comprises an oscillatory wave test module, a communication module, a test result analysis module and a test result output module; wherein: the oscillatory wave test module is in communication connection with the communication module to realize information interaction; the communication module is in communication connection with the test result analysis module to realize information interaction; the test result analysis module is in communication connection with the test result output module to realize information interaction; the oscillatory wave test module is used for testing the cable oscillatory wave partial discharge and completing cable fault positioning to obtain a test result; the communication module is used for networking the oscillatory wave test module and the test result analysis module and transmitting the test result obtained by the oscillatory wave test module to the test result analysis module; the test result analysis module receives and analyzes the test result; and the test result output module outputs a test result report.
Preferably, the oscillatory wave test module includes an oscillatory wave tester and an oscilloscope, wherein: the oscillatory wave tester is used for carrying out cable oscillatory wave partial discharge testing, a first output end of the oscillatory wave tester is in communication connection with an input end of the communication module, and the input end of the oscillatory wave tester is in communication connection with the output end of the communication module, so that information interaction is realized; the oscilloscope is used for displaying voltage waveform and is in communication connection with the communication module to realize information interaction; the second output end of the oscillatory wave tester and the grounding end of the oscilloscope are connected with a high-voltage resistance voltage divider together, and the high-voltage resistance voltage divider is used for dividing direct current high voltage and alternating current high voltage respectively; the second output end of the oscillatory wave tester is connected with an analog cable; and the second output end of the oscillation wave tester is connected with a high-voltage injection capacitor, and the high-voltage injection capacitor is used for injecting electric quantity at high voltage.
Preferably, the voltage waveforms displayed by the oscilloscope comprise a direct current voltage waveform and an alternating current voltage waveform.
Preferably, the analog cable is free of partial discharge capacitance.
Preferably, the ground end of the high-voltage injection capacitor is also connected with a standard pulse generator, and the standard pulse generator is used for generating a standard pulse.
Preferably, the second output end of the oscillatory wave tester is further connected with a high-voltage dielectric loss device, and the high-voltage dielectric loss device is used for generating standard loss.
Preferably, the communication module is a wired communication module or a wireless communication module.
Preferably, the communication module is a communication manager.
Preferably, the test result analysis module is a PC.
Preferably, the test result output module is a printer.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the invention, the cable oscillatory wave partial discharge test is carried out through the oscillatory wave test module, fault positioning is realized, and the aging condition of the cable can be judged according to the obtained test result.
Drawings
FIG. 1 is a schematic overview of the system of the present invention;
FIG. 2 is a block diagram of a system according to the present invention;
FIG. 3 is a schematic circuit diagram according to embodiment 1 of the present invention;
wherein the reference numbers in the figures represent respectively: 1-oscillatory wave testing module; 2-a communication module; 3-a test result analysis module; 4-a test result output module; 11-oscillatory wave tester; 12-an oscilloscope; 13-a high voltage resistive divider; 14-analog cables; 15-high voltage injection capacitor; 16-a standard pulse generator; 17-high voltage dielectric loss device.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
As shown in fig. 1 to 2, a cable oscillatory wave partial discharge measurement system includes an oscillatory wave test module 1, a communication module 2, a test result analysis module 3, and a test result output module 4; wherein: the oscillatory wave test module 1 is in communication connection with the communication module 2 to realize information interaction; the communication module 2 is in communication connection with the test result analysis module 3 to realize information interaction; the test result analysis module 3 is in communication connection with the test result output module 4 to realize information interaction; the oscillatory wave test module 1 is used for testing the cable oscillatory wave partial discharge, completing cable fault positioning and obtaining a test result; the communication module 2 is used for networking the oscillatory wave testing module 1 and the testing result analysis module 3 and transmitting the testing result obtained by the oscillatory wave testing module 1 to the testing result analysis module 3; the test result analysis module 3 receives and analyzes the test result; and the test result output module 4 outputs a test result report.
In the scheme, the oscillatory wave test module 1 is responsible for completing the test of cable oscillatory wave partial discharge, obtaining a test result and realizing cable fault location (see a specific principle); the communication module 2 is responsible for transmitting the test result; the test result analysis module 3 is responsible for analyzing the test result; the test result output module 4 is used for outputting the test result.
Further, the oscillatory wave test module 1 includes an oscillatory wave tester 11 and an oscilloscope 12, wherein: the oscillatory wave tester 11 is used for performing a cable oscillatory wave partial discharge test, a first output end of the oscillatory wave tester 11 is in communication connection with an input end of the communication module 2, and an input end of the oscillatory wave tester 11 is in communication connection with an output end of the communication module 2, so that information interaction is realized; the oscilloscope 12 is used for displaying voltage waveforms, is in communication connection with the communication module 2, and realizes information interaction; a second output end of the oscillatory wave tester 11 and a ground end of the oscilloscope 12 are commonly connected with a high-voltage resistor voltage divider 13, and the high-voltage resistor voltage divider 13 is used for dividing direct-current high voltage and alternating-current high voltage respectively; a second output end of the oscillation wave tester 11 is connected with an analog cable 14; the second output end of the oscillation wave tester 11 is connected with a high-voltage injection capacitor 15, and the high-voltage injection capacitor 15 is used for injecting electric quantity at high voltage.
Further, the voltage waveforms displayed by the oscilloscope 12 include a direct current voltage waveform and an alternating current voltage waveform.
Further, the analog cable 14 is free of partial discharge capacitance.
Further, a standard pulse generator 16 is connected to the ground terminal of the high voltage injection capacitor 15, and the standard pulse generator 16 is used for generating a standard pulse.
Further, a second output end of the oscillation wave tester 11 is further connected with a high-voltage dielectric loss device 17, and the high-voltage dielectric loss device 17 is used for generating standard loss.
Further, the communication module 2 is a wired communication module or a wireless communication module.
Further, the communication module 2 is a communication manager.
Further, the test result analysis module 3 is a PC.
Further, the test result output module 4 is a printer.
The specific principle of the invention is as follows:
the process of the oscillating voltage excitation of the invention is divided into three stages:
1) a direct current charging stage: the analog cable is applied with a unipolar (negative or positive) voltage that increases over time, the time of pressurization of which will depend on the maximum available load current of the power supply, the test voltage level, and the capacitance value of the test article. While current theoretical calculations and measured data indicate that the process does not result in the accumulation of significant amounts of space charge in the XLPE material, the entire charging process should be completed in as short a time as possible (e.g., less than 100 seconds) to avoid possible adverse consequences. Charge measurements on XLPE material at different press times using PEA method;
2) and (3) a switch closing stage: when the simulation cable is charged to reach a given maximum test voltage V, the high-voltage switch is closed, and in order to avoid overvoltage damage of the switch and interference on local discharge measurement, the conduction time of the switch is as short as possible (for example, less than 1 us). Measuring the overvoltage generated in the switch closing stage;
3) and (3) a damped oscillation stage: the oscillation frequency of the oscillatory wave test is equal to the natural frequency of the test loop. The decay of the oscillating voltage depends on the quality factor of the resonant tank. This factor is inversely proportional to the following parameters: the total power loss of the circuit (including the high voltage switch), the power loss of the cable system, and the power loss of the reactor.
When the system is used for measurement, after a simulated cable is pressurized by a low-damping oscillatory wave alternating current withstand voltage test technology, a Partial Discharge (PD) signal generated by the simulated cable is tested by adopting an IEC60270 standard, the insulation condition of the cable is integrally judged according to a Partial Discharge Initial Voltage (PDIV), a Partial Discharge Extinction Voltage (PDEV) and a partial discharge level, and then a specific position generated by the partial discharge signal is detected by a time domain pulse reflection Technology (TDR) to judge the cable insulation weak point.
In the low damping oscillatory wave ac withstand voltage test, a DAC voltage is generated by a high voltage power supply 12 and a capacitive test object (analog cable) is charged to a predetermined test voltage within several seconds. When the test voltage is reached, the high voltage switch closes, forming an LC resonant circuit with the cable capacitance and system inductance, to provide a low damping, damped sinusoidal AC voltage, as shown in fig. 3. The AC frequency was varied in the range of 20 to 800Hz depending on the capacitance of the analog cable tested. The test voltage selected in the DAC voltage test is to apply a specified number of DAC excitations to the analog cable under test and to measure the simultaneous partial discharges and dielectric losses. In the testing process, there is always some risk of not turning the problem found (PD onset) into "crash". It is desirable to combine the withstand voltage test with a sensitive standardized PD measurement DAC, which can be performed in the withstand voltage test, and which is both reliable and sensitive.
In order to determine the specific location of the cable partial discharge, it is necessary to use time domain pulse reflection (TDR), i.e. by injecting a suitable electromagnetic wave pulse into the analog cable and receiving all or part of the reflected pulse from the fault point, locating the distance of the fault point according to the location of the reflected pulse, and determining the fault type according to the size and shape of the reflected pulse.
The system inductance can be selected according to actual use needs.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A cable oscillatory wave partial discharge measurement system is characterized by comprising an oscillatory wave test module (1), a communication module (2), a test result analysis module (3) and a test result output module (4); wherein:
the oscillatory wave test module (1) is in communication connection with the communication module (2) to realize information interaction;
the communication module (2) is in communication connection with the test result analysis module (3) to realize information interaction;
the test result analysis module (3) is in communication connection with the test result output module (4) to realize information interaction;
the oscillatory wave test module (1) is used for testing cable oscillatory wave partial discharge, completing cable fault positioning and obtaining a test result;
the communication module (2) is used for networking the oscillatory wave testing module (1) and the testing result analysis module (3) and transmitting the testing result obtained by the oscillatory wave testing module (1) to the testing result analysis module (3);
the test result analysis module (3) receives and analyzes the test result;
and the test result output module (4) outputs a test result report.
2. The cable oscillatory wave partial discharge measurement system according to claim 1, wherein the oscillatory wave test module (1) comprises an oscillatory wave tester (11), an oscilloscope (12), wherein:
the oscillatory wave tester (11) is used for carrying out cable oscillatory wave partial discharge testing, a first output end of the oscillatory wave tester (11) is in communication connection with an input end of the communication module (2), and an input end of the oscillatory wave tester (11) is in communication connection with an output end of the communication module (2) so as to realize information interaction;
the oscilloscope (12) is used for displaying voltage waveform and is in communication connection with the communication module (2) to realize information interaction;
a second output end of the oscillatory wave tester (11) and a grounding end of the oscilloscope (12) are connected with a high-voltage resistor voltage divider (13) together, and the high-voltage resistor voltage divider (13) is used for dividing direct current high voltage and alternating current high voltage respectively;
the second output end of the oscillation wave tester (11) is connected with an analog cable (14);
and a second output end of the oscillation wave tester (11) is connected with a high-voltage injection capacitor (15), and the high-voltage injection capacitor (15) is used for injecting electric quantity at high voltage.
3. The cable oscillatory wave partial discharge measurement system of claim 2, wherein the voltage waveforms displayed by the oscilloscope (12) comprise a direct current voltage waveform and an alternating current voltage waveform.
4. A cable oscillatory wave partial discharge measurement system in accordance with claim 2, wherein the analogue cable (14) is free of partial discharge capacitance.
5. The cable oscillatory wave partial discharge measurement system according to claim 2, wherein the high voltage injection capacitor (15) is grounded and connected with a standard pulse generator (16), and the standard pulse generator (16) is used for generating a standard pulse.
6. The cable oscillatory wave partial discharge measurement system according to claim 2, wherein the second output end of the oscillatory wave tester (11) is further connected with a high-voltage dielectric loss device (17), and the high-voltage dielectric loss device (17) is used for generating standard loss.
7. The cable oscillatory wave partial discharge measurement system according to claim 1, wherein the communication module (2) is a wired communication module or a wireless communication module.
8. The cable oscillatory wave partial discharge measurement system according to claim 1, wherein the communication module (2) is a communication supervisor.
9. The cable oscillatory wave partial discharge measurement system according to claim 1, wherein the test result analysis module (3) is a PC.
10. The cable oscillatory wave partial discharge measurement system according to claim 1, wherein the test result output module (4) is a printer.
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| CN202011506878.4A CN112578247A (en) | 2020-12-18 | 2020-12-18 | Cable oscillatory wave partial discharge measurement system |
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| CN202011506878.4A CN112578247A (en) | 2020-12-18 | 2020-12-18 | Cable oscillatory wave partial discharge measurement system |
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| CN113295978A (en) * | 2021-06-09 | 2021-08-24 | 广东电网有限责任公司 | Cable detection device, method, terminal device and computer readable storage medium |
| CN113358990A (en) * | 2021-06-07 | 2021-09-07 | 广东电网有限责任公司 | Oscillatory wave test system |
| CN113791313A (en) * | 2021-08-03 | 2021-12-14 | 深圳供电局有限公司 | Partial discharge detection device and detection method thereof |
| WO2022229562A1 (en) * | 2021-04-29 | 2022-11-03 | Epsilon Composite | Method for discriminant monitoring of a composite multi-material assembly |
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