CN112924825A - Medium-voltage cable partial discharge test defect simulation detection method and system - Google Patents
Medium-voltage cable partial discharge test defect simulation detection method and system Download PDFInfo
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- CN112924825A CN112924825A CN202110122573.1A CN202110122573A CN112924825A CN 112924825 A CN112924825 A CN 112924825A CN 202110122573 A CN202110122573 A CN 202110122573A CN 112924825 A CN112924825 A CN 112924825A
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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
- 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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
The invention discloses a method and a system for simulating and detecting defects of a medium-voltage cable partial discharge test, wherein the method comprises the following steps: the system comprises a vibration wave partial discharge host and an intelligent defect simulation cabinet, wherein the intelligent defect simulation cabinet comprises a defect cable short sample; selecting a prefabricated defect cable short sample according to a preset typical defect; inputting the prefabricated defective cable short sample into the defective cable short sample; the oscillation wave partial discharge host is started to generate current, the intelligent defect simulation cabinet is connected with the oscillation wave partial discharge host, and the intelligent defect simulation cabinet detects and analyzes the current so as to display a waveform and complete a partial discharge simulation test. According to the invention, the partial discharge defect simulation test is carried out by simulating the power cable, the partial discharge test data and the spectrum under the typical defect are obtained, and the accuracy of obtaining the typical partial discharge defect waveform spectrums of the power cables of different types is improved.
Description
Technical Field
The invention relates to the technical field of power testing, in particular to a method and a system for simulating and detecting defects of a medium-voltage cable partial discharge test.
Background
The power cable line has the advantages of small occupied area, reliable power supply, small possibility of electric shock, simple and convenient operation and maintenance, and the like, is beneficial to improving the power factor of a power system and beautifying a city. With the development of socio-economic in China, the number of power cables in operation in urban and rural power networks is increasing for the needs of urban construction planning. Therefore, it becomes important to ensure reliable operation of the power cable and to reduce the number of cable failures. However, the existing power cable can only be maintained and detected after the power failure, which wastes time and labor, and causes huge power load loss, affects the electricity consumption of residents and industrial production, and causes irreparable economic loss. Therefore, maintenance and operation work needs to be arranged, and power failure due to faults is prevented, the conventional method for diagnosing partial discharge of the cable comprises a temperature detection method, an ultrasonic detection method, an ultrahigh frequency method and the like, and various factors such as detection precision, interference resistance, fault judgment, fault location and the like of the partial discharge test are integrated, however, the conventional technology cannot acquire partial discharge test data of different defects generated by different types of power cables, so that the detection result is inaccurate, and complete cable partial discharge defect data cannot be established for the later period.
Disclosure of Invention
The invention aims to provide a method and a system for simulating and detecting the defects of the partial discharge test of a medium-voltage cable.
In order to achieve the above object, an embodiment of the present invention provides a method for detecting defects in a partial discharge test of a medium voltage cable, including: the system comprises a vibration wave partial discharge host and an intelligent defect simulation cabinet, wherein the intelligent defect simulation cabinet comprises a defect cable short sample;
selecting a prefabricated defect cable short sample according to a preset typical defect;
inputting the prefabricated defective cable short sample into the defective cable short sample;
the oscillation wave partial discharge host is started to generate current, the intelligent defect simulation cabinet is connected with the oscillation wave partial discharge host, and the intelligent defect simulation cabinet detects and analyzes the current so as to display a waveform and complete a partial discharge simulation test.
Preferably, the selecting the prefabricated defective cable short sample according to the preset typical defect comprises:
the prefabricated defect cable short sample is accurately prefabricated according to typical partial discharge defect types, and the preset typical defects comprise impurities contained in the cable, cable insulation protrusions and poor cable joint process.
Preferably, the selecting the prefabricated defective cable short sample according to the preset typical defect comprises:
the prefabricated defective cable short sample is used for providing a cable partial discharge defect model required in a test, and is continuously stable under a rated voltage.
Preferably, the start the host computer produces electric current is put in the oscillator ripples office, intelligence defect simulation cabinet with the host computer is put in the oscillator ripples office is connected, intelligence defect simulation cabinet is right the electric current detects and the analysis to show the wave form, accomplish the office and put analogue test, include:
the intelligent defect simulation cabinet also comprises a shielding layer ground current detection device, a data recording module, an analysis module and a test waveform display module;
the shielding layer ground current detection device is used for detecting the current flowing into a grounding point of a cable shielding layer of the short defective cable sample, wherein the current is high-frequency partial discharge current, the high-frequency partial discharge current is input into the data recording module to be stored, the analysis module is adopted to analyze the test data, the defect type of the cable is judged according to the test data, and the test waveform is displayed by the test waveform display module.
Preferably, the start the host computer produces electric current is put in the oscillator ripples office, intelligence defect simulation cabinet with the host computer is put in the oscillator ripples office is connected, intelligence defect simulation cabinet is right the electric current detects and the analysis to show the wave form, accomplish the office and put analogue test, include:
in the working process of starting the oscillation wave partial discharge host to generate current, the working temperature is in the range of-10 ℃ to 40 ℃, and the environmental humidity is less than or equal to 80% RH;
in normal operation, the power cable bears 1.7UN voltage, UN is rated withstand voltage of the power cable, and the partial discharge measured value of the device is less than or equal to 10 pC.
The embodiment of the invention also provides a medium-voltage cable partial discharge test defect simulation detection system, which comprises a vibration wave partial discharge host and an intelligent defect simulation cabinet, wherein the intelligent defect simulation cabinet comprises a defective cable short sample;
the presetting module is used for selecting a prefabricated defective cable short sample according to a preset typical defect;
the input module is used for inputting the prefabricated defective cable short sample into the defective cable short sample;
the operation module starts the oscillation wave partial discharge host to generate current, the intelligent defect simulation cabinet is connected with the oscillation wave partial discharge host, and the intelligent defect simulation cabinet detects and analyzes the current so as to display a waveform and complete a partial discharge simulation test.
Preferably, the preset module includes:
the prefabricated defect cable short sample is accurately prefabricated in a laboratory according to typical partial discharge defect types, and the preset typical defects comprise impurities contained in the cable, cable insulation protrusions and poor cable joint process.
Preferably, the preset module includes:
the prefabricated defective cable short sample is used for providing a cable partial discharge defect model required in the test.
Preferably, the operation module includes:
the intelligent defect simulation cabinet also comprises a shielding layer ground current detection device, a data recording module, an analysis module and a test waveform display module;
the shielding layer ground current detection device is used for detecting the high-frequency partial discharge current flowing into the grounding point of the cable shielding layer of the defective cable short sample;
the data recording module and the analysis module are used for storing test data, analyzing the test data and judging the type of the cable defect according to the test data;
and the test waveform display module is used for displaying a test waveform.
Preferably, the operation module includes:
in the working process of starting the oscillation wave partial discharge host to generate current, the working temperature is in the range of-10 ℃ to 40 ℃, and the environmental humidity is less than or equal to 80% RH;
in normal operation, the power cable bears 1.7UN voltage, UN is rated withstand voltage of the power cable, and the partial discharge measured value of the device is less than or equal to 10 pC.
According to the embodiment of the invention, the partial discharge test data and the spectrum under the typical defects are obtained by simulating the partial discharge tests of the medium-voltage power cables of different models under different typical defects, the detection of the partial discharge test equipment of the power cables, the personnel training and the partial discharge defect research are served, the partial discharge defect simulation test is carried out on the power cables, the operation is simple, the defect replacement is fast and flexible, the accuracy of obtaining the typical partial discharge defect waveform spectrums of the power cables of different models is improved, and the partial discharge defect research and the personnel training are greatly facilitated.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for detecting defects in a medium-voltage cable partial discharge test according to an embodiment of the present invention;
fig. 2 is a schematic wiring diagram of a defect simulation apparatus for a cable partial discharge test according to another embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a defect simulation process of a cable partial discharge test according to another embodiment of the present invention;
FIG. 4 is a diagram of an internal structure of a defect intelligent simulation cabinet according to an embodiment of the present invention;
FIG. 5 is a diagram of wiring on the back of a defect intelligent simulation cabinet according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of a defective cable short-sample waveform using impurities in the cable according to another embodiment of the present invention;
FIG. 7 is a schematic view of a short-sample waveform of a defective cable employing cable insulation projections according to another embodiment of the present invention;
FIG. 8 is a waveform illustrating a short sample of a defective cable having a defective cable joint made by another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a system for simulating and detecting a defect in a medium-voltage cable partial discharge test according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the invention provides a method for detecting defects in a partial discharge test of a medium voltage cable, including: the system comprises a vibration wave partial discharge host and an intelligent defect simulation cabinet, wherein the intelligent defect simulation cabinet comprises a defect cable short sample;
s101, selecting a prefabricated defective cable short sample according to a preset typical defect;
specifically, the preset typical defects include: the cable contains impurities, cable insulation protrusions and poor cable joint process; and the prefabricated defective cable short sample is accurately prefabricated according to the typical partial discharge defect type and is used for providing a cable partial discharge defect model required in the test, wherein the prefabricated defective cable short sample is continuously stable under the rated voltage.
S102, inputting the prefabricated defective cable short sample into the defective cable short sample;
referring to fig. 2, specifically, the defect simulation device for the cable partial discharge test includes a compensation capacitor, an oscillating wave or high-frequency partial discharge host, a defect-free sample section I, a defect intelligent simulation cabinet and a defect-free sample section II, wherein the above devices are connected in sequence, the intelligent defect simulation cabinet includes a defect cable short sample, and the prefabricated defect cable short sample is input into the defect cable short sample in the intelligent defect simulation cabinet.
S103, starting the oscillation wave partial discharge host to generate current, connecting the intelligent defect simulation cabinet with the oscillation wave partial discharge host, and detecting and analyzing the current by the intelligent defect simulation cabinet so as to display a waveform and complete a partial discharge simulation test.
Referring to fig. 2, the defect simulation device for the cable partial discharge test comprises a compensation capacitor, a shock wave or high frequency partial discharge host, a defect-free sample section I, a defect intelligent simulation cabinet and a defect-free sample section II, wherein the devices are connected in sequence, and power cable joints of all parts of the device are connected by a standard european partial discharge-free connecting sleeve, so that partial discharge interference caused by the cable joints can be effectively prevented.
Referring to fig. 3, fig. 4 and fig. 5, in the intelligent defect simulation cabinet, the prefabricated defect cable short samples can be manually switched, and by toggling the switch K, three different types of preset typical defect cable short samples can be connected to the test circuit according to the test requirements, where the preset typical defects include: the cable contains impurities, such as metal particles; cable insulation protrusions, such as with air gaps; and poor cable splice processing, such as poor installation. Placing the prefabricated cable short samples with typical partial discharge defects into a prefabricated cable short sample device of a defect intelligent simulation cabinet, switching a manual change-over switch K to a certain typical defect cable short sample, checking whether the wiring of the device is correct and ensuring the safety of personnel, starting a shock wave partial discharge host or a high-frequency partial discharge host, generating pulse alternating-current high voltage with adjustable amplitude, frequency and duration, and inputting the pulse alternating-current high voltage into a test power cable; the cable shielding layer ground current detection device detects high-frequency partial discharge current flowing into a grounding point from a cable shielding layer of a prefabricated defective cable short sample, and sends a detection signal to the data storage and analysis module after passing through the digital-to-analog converter; the data storage and analysis module stores, calls and analyzes the received data and analyzes and judges the partial discharge defect type according to experimental data; the waveform display module displays the test waveform on a display screen so that a tester can read the test waveform conveniently. After one test is completed, the oscillating wave partial discharge host or the high-frequency partial discharge host needs to be closed, after the device and the typical defect cable short sample are discharged, the manual change-over switch K can be operated to change over the sample type, and then the next test is continued according to the previous steps to complete the simulation flow. In the working process of starting the oscillation wave partial discharge host to generate current, the working temperature is in the range of-10 ℃ to 40 ℃, and the environmental humidity is less than or equal to 80 percent RH; in normal operation, the power cable bears 1.7UN voltage, UN is rated withstand voltage of the power cable, and the partial discharge measured value of the device is less than or equal to 10 pC.
In a certain cable partial discharge test defect simulation flow, selecting a prefabricated defect cable short sample according to typical defects, wherein the prefabricated defect cable short sample needs to meet the requirement of voltage resistance of 2 times of rated voltage for 1 hour, is continuously stable under the rated voltage and has no breakdown and flashover, inputting the defect cable short sample into the defect cable short sample in an intelligent simulation cabinet, operating a cable short sample manual switch K, selecting a test cable short sample, starting a shock wave partial discharge host or a high-frequency partial discharge host to generate current, wherein the current is the high-frequency partial discharge current, inputting the high-frequency partial discharge current into a data recording module for storage, analyzing test data by an analysis module, judging the type of the cable defect according to the test data, displaying a test waveform by a test waveform display module, finishing a partial discharge simulation test, closing the shock wave partial discharge host or the high-frequency partial discharge host, thereby the whole device and the test sample are discharged safely.
Referring to fig. 6, 7 and 8, in an example, the device is tested according to a test flow to obtain a waveform, specifically, the compensation capacitor is an HTBC-50, the capacitance value is 40000pF, the oscillator partial discharge host is an ONSITE MV30, the nondefective test sample segment I is a power cable with a size of YJLV22-15/3 × 35 square, the nondefective test sample segment II is a power cable with a size of YJLV22-15/3 × 35 square, the typical defect cable short sample is a cable with a size of YJLV22-15/3 × 50 square, and the three segments of the typical defect cable short sample are pre-manufactured to have one of the following three defects: the cable contains impurities (metal particles), cable insulation protrusions (air gaps), and cable joint process is poor (installation is not in place)
In this embodiment, partial discharge test data and a map under typical defects are acquired by simulating partial discharge tests of medium-voltage power cables of different models under different typical defects, detection of power cable partial discharge test equipment, personnel training and partial discharge defect research are served, the partial discharge defect simulation test is performed on the power cables by adopting the method, the operation is simple, the defect replacement is rapid and flexible, the accuracy of the typical partial discharge defect waveform maps of the power cables of different models is improved, and the partial discharge defect research and the personnel training are greatly facilitated.
Referring to fig. 9, an embodiment of the invention provides a system for simulating and detecting a defect in a partial discharge test of a medium voltage cable, including: the system comprises a vibration wave partial discharge host and an intelligent defect simulation cabinet, wherein the intelligent defect simulation cabinet comprises a defect cable short sample;
the presetting module 11 is used for selecting a prefabricated defective cable short sample according to a preset typical defect;
the input module 12 is used for inputting the prefabricated defective cable short sample into the defective cable short sample;
the operation module 13 starts the oscillation wave partial discharge host to generate current, the intelligent defect simulation cabinet is connected with the oscillation wave partial discharge host, and the intelligent defect simulation cabinet detects and analyzes the current so as to display a waveform and complete a partial discharge simulation test.
For the specific definition of the defect simulation detection system for the medium voltage cable partial discharge test, reference may be made to the above definition, and details are not described herein again. All modules in the medium-voltage cable partial discharge test defect simulation detection system can be completely or partially realized through software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A medium voltage cable partial discharge test defect simulation detection method is characterized by comprising the following steps: the system comprises a vibration wave partial discharge host and an intelligent defect simulation cabinet, wherein the intelligent defect simulation cabinet comprises a defect cable short sample;
selecting a prefabricated defect cable short sample according to a preset typical defect;
inputting the prefabricated defective cable short sample into the defective cable short sample;
the oscillation wave partial discharge host is started to generate current, the intelligent defect simulation cabinet is connected with the oscillation wave partial discharge host, and the intelligent defect simulation cabinet detects and analyzes the current so as to display a waveform and complete a partial discharge simulation test.
2. The method for simulating and detecting the defect of the medium-voltage cable partial discharge test according to claim 1, wherein the step of selecting the prefabricated defect cable short sample according to the preset typical defect comprises the following steps:
the prefabricated defect cable short sample is accurately prefabricated according to typical partial discharge defect types, and the preset typical defects comprise impurities contained in the cable, cable insulation protrusions and poor cable joint process.
3. The method for simulating and detecting the defect of the medium voltage cable partial discharge test according to claim 2, wherein the step of selecting the prefabricated defect cable short sample according to the preset typical defect comprises the following steps:
the prefabricated defective cable short sample is used for providing a cable partial discharge defect model required in a test, and is continuously stable under a rated voltage.
4. The method for simulating and detecting the defect of the medium-voltage cable partial discharge test according to claim 1, wherein the step of starting the oscillator wave partial discharge host to generate a current, the intelligent defect simulation cabinet is connected with the oscillator wave partial discharge host, and the intelligent defect simulation cabinet detects and analyzes the current so as to display a waveform and complete the partial discharge simulation test comprises the steps of:
the intelligent defect simulation cabinet also comprises a shielding layer ground current detection device, a data recording module, an analysis module and a test waveform display module;
the shielding layer ground current detection device is used for detecting the current flowing into a grounding point of a cable shielding layer of the short defective cable sample, wherein the current is high-frequency partial discharge current, the high-frequency partial discharge current is input into the data recording module to be stored, the analysis module is adopted to analyze the test data, the defect type of the cable is judged according to the test data, and the test waveform is displayed by the test waveform display module.
5. The method for simulating and detecting the defect of the medium voltage cable partial discharge test according to claim 4, wherein the starting of the oscillating wave partial discharge host to generate a current, the intelligent defect simulation cabinet connected to the oscillating wave partial discharge host, the intelligent defect simulation cabinet detecting and analyzing the current to display a waveform, and completing the partial discharge simulation test comprises:
in the working process of starting the oscillation wave partial discharge host to generate current, the working temperature is in the range of-10 ℃ to 40 ℃, and the environmental humidity is less than or equal to 80% RH;
in normal operation, the power cable bears 1.7UN voltage, UN is rated withstand voltage of the power cable, and the partial discharge measured value of the device is less than or equal to 10 pC.
6. The utility model provides a medium voltage cable partial discharge test defect simulation detecting system which characterized in that includes: the system comprises a vibration wave partial discharge host and an intelligent defect simulation cabinet, wherein the intelligent defect simulation cabinet comprises a defect cable short sample;
the presetting module is used for selecting a prefabricated defective cable short sample according to a preset typical defect;
the input module is used for inputting the prefabricated defective cable short sample into the defective cable short sample;
the operation module starts the oscillation wave partial discharge host to generate current, the intelligent defect simulation cabinet is connected with the oscillation wave partial discharge host, and the intelligent defect simulation cabinet detects and analyzes the current so as to display a waveform and complete a partial discharge simulation test.
7. The system according to claim 6, wherein the presetting module comprises:
the prefabricated defect cable short sample is accurately prefabricated in a laboratory according to typical partial discharge defect types, and the preset typical defects comprise impurities contained in the cable, cable insulation protrusions and poor cable joint process.
8. The system according to claim 7, wherein the presetting module comprises:
the prefabricated defective cable short sample is used for providing a cable partial discharge defect model required in the test.
9. The system for simulating and detecting the defect of the medium-voltage cable partial discharge test according to claim 6, wherein the operation module comprises:
the intelligent defect simulation cabinet also comprises a shielding layer ground current detection device, a data recording module, an analysis module and a test waveform display module;
the shielding layer ground current detection device is used for detecting the high-frequency partial discharge current flowing into the grounding point of the cable shielding layer of the defective cable short sample;
the data recording module and the analysis module are used for storing test data, analyzing the test data and judging the type of the cable defect according to the test data;
and the test waveform display module is used for displaying a test waveform.
10. The system for simulating and detecting the defect in the medium voltage cable partial discharge test according to claim 9, wherein the operation module comprises:
in the working process of starting the oscillation wave partial discharge host to generate current, the working temperature is in the range of-10 ℃ to 40 ℃, and the environmental humidity is less than or equal to 80% RH;
in normal operation, the power cable bears 1.7UN voltage, UN is rated withstand voltage of the power cable, and the partial discharge measured value of the device is less than or equal to 10 pC.
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| WO2023078457A1 (en) * | 2021-11-08 | 2023-05-11 | 南方电网科学研究院有限责任公司 | Sand table simulation system for intelligent operation and maintenance of power cable, simulation method, device and medium |
| CN114187811B (en) * | 2021-11-08 | 2024-12-13 | 南方电网科学研究院有限责任公司 | Power cable intelligent operation and maintenance sandbox simulation system, simulation method, equipment and medium |
| CN115656445A (en) * | 2022-11-11 | 2023-01-31 | 江苏省特种设备安全监督检验研究院 | Test method for detecting typical defects of directly buried jacketed steam pipelines |
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Application publication date: 20210608 |