CN109298300A - One kind being used for part discharge test system and method when high-tension cable pressure test - Google Patents
One kind being used for part discharge test system and method when high-tension cable pressure test Download PDFInfo
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- CN109298300A CN109298300A CN201811478092.9A CN201811478092A CN109298300A CN 109298300 A CN109298300 A CN 109298300A CN 201811478092 A CN201811478092 A CN 201811478092A CN 109298300 A CN109298300 A CN 109298300A
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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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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The partial discharge test system when present invention provides one kind for high-tension cable pressure test, it includes that series resonance generates unit, high speed acquisition unit, data processing unit, series resonance generates unit and connects power supply, the output that series resonance generates unit connects tested cable, apply test signal to tested cable, high speed acquisition unit obtains the electric signal on cable shielding layer earthing line, the data acquired by connection to data processing unit transmission；Series resonance generates unit, includes variable-frequency power sources, increasing apparatus, resonant element, and the input of variable-frequency power sources connects power supply, carries out frequency, voltage conversion to the AC power source of input, the output of variable-frequency power sources connects increasing apparatus.Data processing unit establishes increasing apparatus discharge data library for obtaining acquisition data, analyzes data, and show analysis result.The present invention is applied widely, and small in size, light-weight, capacity of experiment is big, test voltage is high, does not require booster for no partial discharge device.
Description
Technical field
The present invention relates to technical field of electric power detection, specially a kind of to be used for shelf depreciation survey when high-tension cable pressure test
Test system and method.
Background technique
The insulating properties of cable is an important indicator of cable, and cable not merely needs to test integral insulation, heavier
What is wanted is insulation defect existing for measurement cable respective location, and it is existing to have shelf depreciation for the local defect of cable under high pressure
As slowly damaging cable insulation medium, eventually leading to dielectric breakdown, break down.
National standard GB 50150-2016 " the electric device installing engineering electrical equipment handover examination that on December 1st, 2016 implements
Standard inspection is quasi- " the 8th article of the 17th part is required when high-tension cable does pressure test, while the shelf depreciation of detection cable.Utilize office
Monitoring system is put in pressure-resistant process, Partial discharge signal is looked over one's shoulder with the trend of voltage and time change, it is serious to grasp electric cable stoppage
The variation of degree.
How high-tension cable pressure resistance Partial Discharge Detection, difficulty and technical bottleneck mainly exclude increasing apparatus itself office
The interference of portion's electric discharge.What is used both at home and abroad at present is mainly the following method:
Without partial discharge increasing apparatus
Before no cable local discharge technology, traditional pressure-resistant increasing apparatus is produced using frequency conversion resonance vibration device
Raw experiment power supply, as shown in Figure 1, frequency conversion tank is the core component of device, frequency conversion tank is obtained by the rectification and inversion of thyristor
Frequency needed for test, introduces a large amount of harmonic wave or high-frequency pulse current composition during power conversion.In high-frequency components,
Existing creeping discharge, also there is shelf depreciation.
Cable local discharge test when, the judgement of the shelf depreciation of cable insulation ontology can be seriously affected, so, just whether there is or not
Partial discharge increasing apparatus technology.But no partial discharge increasing apparatus is very strict to the requirement of excitation-transformation variable manufacturing process, expensive.
1, frequency conversion phase fenestration
Partial discharge test is carried out simultaneously during carrying out cable voltage test, since cable voltage experiment power supply uses alien frequencies
Power supply, power frequency component do not have correlation on the phase map by test system, and only the Partial discharge signal inside increasing apparatus can
There can be correlation on the phase map of power frequency component, be believed using the interference that this point can effectively exclude running equipment generation
Number.The Partial discharge signal of experimental rig itself is that the closing of opening of thyristor causes, and is generally concentrated at particular phases, and this kind of interference exists
It can be excluded to a certain extent by " opening phase window ".But this method, the accurate phase information that obtains is difficult, is easy mixed
The shelf depreciation of increasing apparatus of confusing and the shelf depreciation of cable body.
2, power cable pressure test local discharge detection device and detection method
This method, which is laid particular emphasis on, filters out low-frequency interference signal using saturable reactor, and acquisition system acquires ultra-high frequency signal.But
Be that there are such shortcomings for this method: 1) discharge frequency that increasing apparatus generates is random, and existing low frequency, surpasses high frequency
High-frequency signal, collected ultra-high frequency signal inevitably have the ultra-high frequency signal of increasing apparatus；2) ultra-high frequency signal attenuation coefficient is big,
Transmission range is short, is applicable in the relatively close shorter capacitive electrical equipment such as end, is not suitable for the partial discharge test of longer cable.
3, oscillation wave cable local discharge test method
Cable oscillation wave detection technique is based on LCR damped oscillation principle and passes through on the basis of completing cable DC charging
Solid-state switch and test product cable form damped oscillation voltage wave when built-in high voltage reactor, high-pressure solid, apply on test product cable
The sinusoidal voltage wave for adding approximate power frequency, inspires the discharge signal at cable latent defect.This method can only accomplish 10kV at present
And it is bulky, cost is high.
Summary of the invention
In order to overcome the drawbacks of the prior art, shelf depreciation is surveyed when the present invention provides one kind for high-tension cable pressure test
Test system generates the sine wave AC voltage that unit generates fixed frequency using series resonance, is applied on tested cable, passes through
High speed acquisition unit obtains electric signal, is transmitted to processing unit according to the characteristic of electric signal, obtains the position that shelf depreciation occurs
Etc. information.
Specifically, part discharge test system and method when the present invention provides one kind for high-tension cable pressure test,
Unit, high speed acquisition unit, data processing unit are generated including series resonance, series resonance generates unit and connects power supply, the string
Join the tested cable of output connection that resonance generates unit, for applying pressure-resistant voltage, the high speed acquisition unit to tested cable
The current signal on cable shielding layer earthing line is obtained, the high speed acquisition unit passes through connection to the data processing unit
Transmit the data of acquisition；
The series resonance generates unit and includes variable-frequency power sources, increasing apparatus and resonant element, the variable-frequency power sources
Input terminal connects power supply, for carrying out frequency and voltage conversion, the output end of the variable-frequency power sources to the AC power source of input
The increasing apparatus is connected, the increasing apparatus meets for boosting to the alternating current of input tests required high pressure,
The output end of the increasing apparatus connects the resonant element, and the resonant element and tested cable form series resonant circuit；
The high speed acquisition unit includes High Frequency Current Sensor and high-speed collection card, and the High Frequency Current Sensor is used
The high-frequency current signal on tested cable shielding layer earthing line is measured, the high-speed collection card connects the High Frequency Current Sensor
Output end, for the high-frequency current signal of measurement to be converted to digital signal, and be transmitted to the data processing unit；
The data processing unit analyzes data for obtaining acquisition data and establishing increasing apparatus high-frequency discharge database
And show analysis result.
Preferably, it is frequency conversion type resonant unit that series resonance, which generates unit,.
Wherein, frequency conversion type resonant unit carries out the calculation formula of resonance frequency are as follows:
Wherein f0For resonance frequency, unit Hz；L is reactor inductance amount, unit H；C is tested product capacitor, unit μ F.
Preferably, the data processing unit is the PC computer with processing software.
Preferably, the series resonance generates unit and exchanges electric boost using 60Hz.
Preferably, the present invention also provides a kind of measurement methods comprising following steps:
The high speed acquisition unit first carries out high-speed wideband sampling to the current pulse signal of increasing apparatus electric discharge, obtains
The complete time domain waveform of the number of winning the confidence extracts the discharge pulse fingerprint characteristic of increasing apparatus after Wavelet Denoising Method, establishes boosting dress
High-frequency discharge database is set, on this basis, with artificial intelligence identification technology, to containing cable discharge, the increasing apparatus
The blended data of electric discharge is analyzed and determined, to eliminate the electric discharge interference of increasing apparatus.
Preferably, the present invention also provides a kind of data processing methods:
The electric discharge initial data of the increasing apparatus is first obtained on the ground line of the increasing apparatus, it is small by the second generation
After wave conversion noise-removed technology, each pulse fingerprint characteristic amount is extracted, and establish database；Cable screens when re-test is normally pressure-resistant
The signal on layer ground line is covered, discharge signal of the signal with increasing apparatus passes through Second Generation Wavelet Transformation noise-removed technology
It is special with increasing apparatus pulse fingerprint one by one remaining pulse using K-Means clustering recognition and decision Tree algorithms after processing
Sign amount database compares, so that the homogeneity pulse zero setting after cluster, to reach the interference of shielding increasing apparatus electric discharge.
Compared with prior art, the invention has the following advantages:
The present invention is applied widely, and small in size, light-weight, capacity of experiment is big, test voltage is high.High safety and reliability, behaviour
It is succinct convenient to make, and the equivalence of test is good,
Series resonant equipment of the invention is very big to higher harmonic components impedance loop, so waveform is good on test product；Simultaneously
If flashing, breakdown occur during pressure test, because losing condition of resonance, high voltage disappears immediately, to keep electric arc vertical
Extinguish.
It is longer that the present invention restores Voltage Establishment process, it is easy to control power source trip before reaching flashover voltage again, keep away
Exempt to repeat to puncture, restores voltage and do not generate overvoltage caused by any overshoot.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is structural schematic block diagram of the invention；
Fig. 3 is circuit diagram of the invention；
Fig. 4 is flow chart of the invention.
Specific embodiment
Below with reference to the attached drawing exemplary embodiment that the present invention will be described in detail, feature and aspect.It is identical attached in attached drawing
Icon note indicates element functionally identical or similar.Although the various aspects of embodiment are shown in the attached drawings, unless special
It does not point out, it is not necessary to attached drawing drawn to scale.
The partial discharge test system when present invention provides one kind for high-tension cable pressure test, as shown in Figure 1 to Figure 3,
It includes that series resonance generates unit 1, high speed acquisition unit 2, data processing unit 3, and the series resonance generates unit 1 and connects electricity
Source, the output that the series resonance generates unit 1 connect tested cable, apply pressure-resistant voltage to tested cable, the high speed is adopted
Collect the electric signal on the acquisition cable of unit 2, the data acquired by connection to the data processing unit 3 transmission.
The series resonance generates unit 1, includes variable-frequency power sources 11, increasing apparatus 12, resonant element 13, the variable-frequency electric
The input in source 11 connects power supply, carries out frequency, voltage conversion to the AC power source of input, the output of the variable-frequency power sources 11 connects described
The alternating current of increasing apparatus 12,12 pairs of increasing apparatus inputs boosts, and tests required high pressure, the boosting to meet
The output of device 12 connects the resonant element 13, and the resonant element 13 forms series resonant circuit with tested cable.
The high speed acquisition unit 2 includes High Frequency Current Sensor 21, high-speed collection card 22, the High Frequency Current Sensor
21 are connected the high-frequency electrical and are spread with the current signal on the shielding layer grounding line for measuring tested cable, the high-speed collection card 22
The current signal of measurement is converted to digital signal by the output of sensor 21, and is transmitted to the data processing unit 3.
The data processing unit 3 establishes database for obtaining acquisition data, analyzes data, and shows analysis knot
Fruit.
Preferably, it is frequency conversion type resonant unit that series resonance, which generates unit 1,.
The calculation formula of frequency conversion type resonant unit progress resonance frequency are as follows:
Wherein f0For resonance frequency, unit Hz；L is reactor inductance amount, unit H；C is tested product capacitor, unit μ F.
Preferably, the data processing unit 3 is the PC computer with processing software.
Preferably, the series resonance generates unit 1 and exchanges electric boost using 60Hz.
Preferably, the present invention also provides a kind of measurement methods comprising following steps:
The high speed acquisition unit 2 first carries out high-speed wideband to the current pulse signal of the increasing apparatus 12 electric discharge and adopts
Sample obtains the time domain waveform of signal integrity, extracts increasing apparatus high-frequency discharge fingerprint characteristic, and establish the discharge count of increasing apparatus
According to library, the data that the data processing unit 3 is obtained according to the high speed acquisition unit 2 establish 12 discharge data of increasing apparatus
Library, on this basis, with artificial intelligence identification technology, to the mixed number containing cable discharge, the electric discharge of the increasing apparatus 12
According to being analyzed and determined, to eliminate the electric discharge interference of increasing apparatus 12.
Preferably, the present invention also provides a kind of data processing methods:
As shown in figure 4, first obtaining the electric discharge original number of the increasing apparatus 12 on the ground line of the increasing apparatus 12
According to extracting each pulse fingerprint characteristic amount, and establish database after Second Generation Wavelet Transformation noise-removed technology；Re-test
Signal on cable grounding, the signal have the discharge signal of increasing apparatus, are handled by Second Generation Wavelet Transformation noise-removed technology
Afterwards, using K-Means clustering recognition and decision Tree algorithms, remaining pulse, one by one with increasing apparatus pulse fingerprint characteristic amount
Database compares, so that the homogeneity pulse zero setting after cluster, to reach the interference of shielding increasing apparatus electric discharge.
Inside system software when setting shielding dot factor, the pulse signal that cable itself is issued is avoided accidentally to shield.This
Invention system acquisition rate is to acquire 4X10 in 20ms6A, i.e., the off time of each point is 5X10-6ms.Different boostings
The pulse that device issues has different pulse widths, it requires points before and after different shielding main pulses is arranged, according to big
Amount experiment is learnt, the pulse that 9000 points mask increasing apparatus enough is arranged.
When due to doing pressure resistance, it is proposed that use 60Hz ac test, the phase difference with the working power of 50Hz booster is
3X10-3s；And the total time of 9000 sampled points is 4.5X10-4S, not in an order of magnitude, so cable will not be masked accidentally
Issue the valid data of pulse.
Compared with prior art, the invention has the following advantages:
The present invention is applied widely, and small in size, light-weight, capacity of experiment is big, test voltage is high.High safety and reliability, behaviour
It is succinct convenient to make, and the equivalence of test is good,
Series resonant equipment of the invention is very big to higher harmonic components impedance loop, so waveform is good on test product；Simultaneously
If flashing, breakdown occur during pressure test, because losing condition of resonance, high voltage disappears immediately, to keep electric arc vertical
Extinguish.
It is longer that the present invention restores Voltage Establishment process, it is easy to control power source trip before reaching flashover voltage again, keep away
Exempt to repeat to puncture, restores voltage and do not generate overvoltage caused by any overshoot.
Finally, it should be noted that above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should understand that:
It can still modify to technical solution documented by previous embodiment, or to part of or all technical features into
Row equivalent replacement；And these modifications or substitutions, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side
The range of case.
Claims (7)
1. one kind is used for partial discharge test system when high-tension cable pressure test, it is characterised in that: it includes that series resonance produces
Raw unit, high speed acquisition unit, data processing unit, series resonance generate unit and connect power supply, and the series resonance generates unit
Output connect tested cable, for applying pressure-resistant voltage to tested cable, the high speed acquisition unit obtains cable shield
Current signal on ground line, the number that the high speed acquisition unit is acquired by connection to data processing unit transmission
According to；
It includes variable-frequency power sources, increasing apparatus and resonant element, the input of the variable-frequency power sources that the series resonance, which generates unit,
End connection power supply, for carrying out frequency and voltage conversion, the output end connection of the variable-frequency power sources to the AC power source of input
The increasing apparatus, the increasing apparatus meets for boosting to the alternating current of input tests required high pressure, described
The output end of increasing apparatus connects the resonant element, and the resonant element and tested cable form series resonant circuit；
The high speed acquisition unit includes High Frequency Current Sensor and high-speed collection card, the High Frequency Current Sensor measurement
High-frequency current signal on tested cable shielding layer earthing line, the high-speed collection card connect the defeated of the High Frequency Current Sensor
Outlet for the high-frequency current signal of measurement to be converted to digital signal, and is transmitted to the data processing unit；
The data processing unit is for obtaining acquisition data and establish increasing apparatus high-frequency discharge database, analyzing data and showing
Show analysis result.
2. according to claim 1 be used for partial discharge test system when high-tension cable pressure test, it is characterised in that: string
Joining resonance to generate unit is frequency conversion type resonant unit.
3. according to claim 2 be used for partial discharge test system when high-tension cable pressure test, it is characterised in that: become
The calculation formula of frequency formula resonant element progress resonance frequency are as follows:
Wherein f0For resonance frequency, unit Hz；L is reactor inductance amount, unit H；C is tested product capacitor, unit μ F.
4. according to claim 1 be used for partial discharge test system when high-tension cable pressure test, it is characterised in that: institute
Stating data processing unit is the PC computer with processing software.
5. according to claim 2 be used for partial discharge test system when high-tension cable pressure test, it is characterised in that: institute
It states series resonance and generates unit using 60Hz exchange electric boost.
6. according to claim 2 be used for the side that measures of partial discharge test system when high-tension cable pressure test
Method, it is characterised in that: itself the following steps are included:
The high speed acquisition unit first carries out high-speed wideband sampling to the current pulse signal of increasing apparatus electric discharge, obtains letter
Number complete time domain waveform extracts multi-signal fingerprint characteristic for the difference between different electric discharges and noise, by different letters
It number separates, the data that the data processing unit is obtained according to the high speed acquisition unit establish increasing apparatus discharge count
According to library, on this basis, with artificial intelligence identification technology, to the mixed number containing cable discharge, increasing apparatus electric discharge
According to being analyzed and determined, to eliminate the electric discharge interference of increasing apparatus.
7. according to claim 2 be used for partial discharge test system when high-tension cable pressure test, it is characterised in that: institute
It states data cell and carries out data processing method particularly includes: first obtain the increasing apparatus on the ground line of the increasing apparatus
Electric discharge initial data extract each pulse fingerprint characteristic amount, and establish number after Second Generation Wavelet Transformation noise-removed technology
According to library；Signal on re-test cable grounding, the signal have the discharge signal of increasing apparatus, are gone by Second Generation Wavelet Transformation
Make an uproar after technical treatment, using K-Means clustering recognition and decision Tree algorithms, remaining pulse, one by one with increasing apparatus pulse
Fingerprint characteristic amount database compares, so that the homogeneity pulse zero setting after cluster, to reach the interference of shielding increasing apparatus electric discharge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811478092.9A CN109298300A (en) | 2018-12-04 | 2018-12-04 | One kind being used for part discharge test system and method when high-tension cable pressure test |
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| CN201811478092.9A CN109298300A (en) | 2018-12-04 | 2018-12-04 | One kind being used for part discharge test system and method when high-tension cable pressure test |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752634A (en) * | 2019-03-01 | 2019-05-14 | 浙江新图维电子科技有限公司 | A kind of cable connector resonant mode mutual inductance partial discharge detection device and detection method |
| CN110146790A (en) * | 2019-05-06 | 2019-08-20 | 西安工程大学 | A kind of special-shaped wave detection device and detection method of shelf depreciation |
| CN110596544A (en) * | 2019-09-04 | 2019-12-20 | 国网四川省电力公司电力科学研究院 | Partial discharge test platform under power cable frequency conversion series resonance |
| CN110749809A (en) * | 2019-11-11 | 2020-02-04 | 深圳供电局有限公司 | GIS fault detection device and system |
| CN112034311A (en) * | 2020-08-03 | 2020-12-04 | 国网宁夏电力有限公司电力科学研究院 | Dynamic tracking interference-eliminating high-frequency coupling partial discharge detection device and method |
| CN112485624A (en) * | 2020-12-10 | 2021-03-12 | 广东电网有限责任公司 | Partial discharge-free test power supply circuit |
| CN112557847A (en) * | 2020-11-30 | 2021-03-26 | 国网辽宁省电力有限公司电力科学研究院 | Polypropylene cable composite aging test device and method |
| CN112630585A (en) * | 2020-11-06 | 2021-04-09 | 国网山东省电力公司济宁供电公司 | Distribution cable partial discharge live detection system and detection method |
| CN112834873A (en) * | 2020-12-28 | 2021-05-25 | 深圳供电局有限公司 | Partial discharge test system and cable test system |
| CN116400201A (en) * | 2023-06-06 | 2023-07-07 | 中诚华隆计算机技术有限公司 | Core particle working state monitoring method and device, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109752634A (en) * | 2019-03-01 | 2019-05-14 | 浙江新图维电子科技有限公司 | A kind of cable connector resonant mode mutual inductance partial discharge detection device and detection method |
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| CN112034311A (en) * | 2020-08-03 | 2020-12-04 | 国网宁夏电力有限公司电力科学研究院 | Dynamic tracking interference-eliminating high-frequency coupling partial discharge detection device and method |
| CN112630585A (en) * | 2020-11-06 | 2021-04-09 | 国网山东省电力公司济宁供电公司 | Distribution cable partial discharge live detection system and detection method |
| CN112630585B (en) * | 2020-11-06 | 2023-03-14 | 国网山东省电力公司济宁供电公司 | Distribution cable partial discharge live detection system and detection method |
| CN112557847A (en) * | 2020-11-30 | 2021-03-26 | 国网辽宁省电力有限公司电力科学研究院 | Polypropylene cable composite aging test device and method |
| CN112557847B (en) * | 2020-11-30 | 2024-05-31 | 国网辽宁省电力有限公司电力科学研究院 | Polypropylene cable composite aging test device and method |
| CN112485624A (en) * | 2020-12-10 | 2021-03-12 | 广东电网有限责任公司 | Partial discharge-free test power supply circuit |
| CN112834873A (en) * | 2020-12-28 | 2021-05-25 | 深圳供电局有限公司 | Partial discharge test system and cable test system |
| CN116400201A (en) * | 2023-06-06 | 2023-07-07 | 中诚华隆计算机技术有限公司 | Core particle working state monitoring method and device, electronic equipment and storage medium |
| CN116400201B (en) * | 2023-06-06 | 2023-08-11 | 中诚华隆计算机技术有限公司 | Core particle working state monitoring method and device, electronic equipment and storage medium |
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