CN109031077A - A kind of cable oscillatory wave partial discharge fault location system - Google Patents
A kind of cable oscillatory wave partial discharge fault location system Download PDFInfo
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- CN109031077A CN109031077A CN201811072450.6A CN201811072450A CN109031077A CN 109031077 A CN109031077 A CN 109031077A CN 201811072450 A CN201811072450 A CN 201811072450A CN 109031077 A CN109031077 A CN 109031077A
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Testing Relating To Insulation (AREA)
Abstract
A kind of cable oscillatory wave partial discharge fault location system, including High Frequency Current Sensor, the local discharge signal of induction is input in advance signal wave detector by High Frequency Current Sensor, advance signal wave detector judges signal, and it controls subsequent variable gain amplifier and selects straight-through or amplification factor, signal is amplified into high-speed AD acquisition card analog-to-digital conversion by variable gain amplifier later, and data are transmitted to host computer and are analyzed, and handle and show；The present invention is by increasing advance signal detector and variable gain amplification module, significantly improve the amplitude of reflection signal, improve AD collection effect, related operation is used to sampled data simultaneously, wave character algorithm carries out Waveform Matching, matching effect is improved to greatest extent, the recognition effect of inductive signal twice is greatly promoted, and effectively increases fault location precision.
Description
Technical field
The invention belongs to power cable Partial Discharge Detecting Technology fields, in particular to based on variable gain amplification module
A kind of cable oscillatory wave partial discharge fault location system.
Technical background
The problem of partial discharges fault positioning of power cable is the urgent need to resolve in live detection, general shelf depreciation is fixed
Position is divided into traveling wave method and both-end positioning, and both-end positioning detects signal simultaneously at the both ends of discharge source respectively, arrived according to synchronization signal
Up to the time difference calculating position of both-end, when traveling wave method is the original signal of an equipment detection discharge signal and reflects the propagation of signal
Difference positions, and traveling wave method method is simple, but on-site test electromagnetic interference is larger, local discharge signal amplitude is smaller, reflection
Signal amplitude can be submerged in ambient noise mostly, it is difficult to be identified；Common partial discharges fault is using impulse amplitude, signal frequency
Identification is brought, there is the initial time inaccuracy of judgement electric discharge, remote afterpulse amplitude of transmitting is too small, can not even sentence sometimes
It is disconnected to break down, cause location algorithm to fail, how to accurately identify discharge pulse, is before carrying out partial discharges fault positioning
It mentions.
Summary of the invention
The problem of for the positioning of traveling wave method shelf depreciation, the invention proposes based on variable gain amplification module
A kind of cable oscillatory wave partial discharge fault location system can be improved the pulse recognition ability under weak signal conditions, solve
The problem of position inaccurate.
To solve the above-mentioned problems, the technical solution of the present invention is as follows:
A kind of cable oscillatory wave partial discharge fault location system, including High Frequency Current Sensor, High Frequency Current Sensor
The local discharge signal of induction is input in advance signal wave detector, advance signal wave detector judges signal, and controls
It makes subsequent variable gain amplifier and selects straight-through or amplification factor, signal is laggard by the amplification of variable gain amplifier later
Enter high-speed AD acquisition card analog-to-digital conversion, data are transmitted to host computer and are analyzed, and handle and show；
The host computer uses the matching algorithm of Partial Discharge, first calculates the sample bits of shelf depreciation input signal
It sets, waveform, the signals such as spectrum signature；Then the data after big signal are segmented, calculate separately the wave character of segmentation
Signal finds the wave character to match with the big signal of input and accurately calculates the time difference according to the sampling time point of two signals
Value, to be accurately positioned according to cable length and transmission speed.
The High Frequency Current Sensor is that local discharge signal is incuded based on Rogowski coil principle, before output end is used as
Set the input terminal of wave detector.
The preposition wave detector is signal peak wave detector, judges the amplitude size of input signal, and is sentenced according to amplitude
Disconnected input signal is incoming signal or reflection signal, controls the amplification factor of variable gain amplifier.
The variable gain amplifier is the controllable broadband amplifiers of gain factor, and amplification factor is from 10 times to 100 times
It is optional, control of the amplification factor by preposition wave detector；Variable gain amplification process is as a result, be directed to shelf depreciation incoming signal amplitude
By force, the decaying of reflection signal is big, and the small feature of signal amplitude is added to advance signal wave detector, detects the signal of input, preceding confidence
Number wave detector output access variable gain amplifier, gain control by the result of sound detector, when guaranteeing the big signal of input,
Variable gain amplifier does not amplify or gain is smaller, guarantees that signal is unsaturated by amplifier, when small signal inputs, gain is put
Greatly, it can be identified by high-speed AD acquisition card.
The high-speed AD acquisition card is four-way synchronous acquisition, sample rate 125M/s, 12 AD precision, input range
For ± 1V, using DDR3 massive store, 100ms can be arrived by sampling duration.
The invention has the benefit that
By increasing advance signal detector and variable gain amplification module, the amplitude of reflection signal is significantly improved, is mentioned
AD collection effect has been risen, while related operation is used to sampled data, wave character algorithm carries out Waveform Matching, mentions to greatest extent
High matching effect, greatly promotes the recognition effect of inductive signal twice, effectively increases fault location precision.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is further described in more detail.
Shown in referring to Fig.1, a kind of power cable partial discharges fault positioning system based on variable gain amplification module, point
Not by High Frequency Current Sensor, advance signal wave detector, variable gain amplifier, high-speed AD acquisition card, host computer composition；High frequency
The local discharge signal of induction is input in advance signal wave detector by current sensor, and advance signal wave detector carries out signal
Judgement, and control subsequent variable gain amplifier and select straight-through or amplification factor, signal passes through variable gain amplifier later
Be amplified into high-speed AD acquisition card analog-to-digital conversion, data are transmitted to host computer and are analyzed, and handle and show.
The host computer is to grind magnificent industrial personal computer, using the matching algorithm of Partial Discharge, first calculates shelf depreciation and enters
Penetrate the sampling location of signal, waveform, spectrum signature signal；Then the data after the big signal of incoming signal are segmented, point
The wave character signal of segmentation is not calculated, the waveform position to match with reflection signal is found, when according to the sampling of two signals
Between point, the time difference being exactly found between incident waveform and reflection configuration, further according to the biography of cable length and electromagnetic wave
Defeated velocity interpolation is accurately positioned.
The High Frequency Current Sensor is HFCT sensor, is to incude local discharge signal based on Rogowski coil principle,
Input terminal of its output end as preposition wave detector.
The preposition wave detector model is AD8313 wave detector；It is signal peak wave detector, judges the width of input signal
It is worth size, and judges that input signal for incoming signal or reflection signal, controls the times magnification of variable gain amplifier according to amplitude
Number.
The variable gain amplifier model is AD8009 amplifier, is the controllable broadband amplifiers of gain factor, puts
Big multiple times optional, the control of amplification factor by preposition wave detector from 10 times to 100；Variable gain amplification process is as a result, be directed to
Shelf depreciation incoming signal amplitude is strong, and reflection signal decaying is big, and the small feature of signal amplitude is added to advance signal wave detector,
Detect the signal of input, advance signal wave detector output access variable gain amplifier, result of the gain by sound detector
Control, when guaranteeing to input big signal, variable gain amplifier does not amplify or gain is smaller, guarantees that signal passes through amplifier insatiable hunger
When inputting with, small signal, gain amplification can be identified by high-speed AD acquisition card.
The high-speed AD acquisition card is FPGA four-way synchronous acquisition, sample rate 125M/s, 12 AD precision, input
Range is ± 1V, and using DDR3 massive store, 100ms can be arrived by sampling duration.
The matching algorithm of the Partial Discharge is new more PD pulse signal recognition methods, it is answered in time-frequency domain
With the match tracing principle research PD pulse characteristic of Laplace small echo.By the collected PD signal for being mixed with much noise signal
Compared with all basic functions in Laplace wavelet library, Partial discharge signal is determined whether it is by calculating coefficient of similarity.
In multiple partial discharge sources and there are in the case where multiple reflections, which can not only inhibit to interfere, but also can extract more
Mostly useful partial discharge characteristic information, such as the generation moment of PD signal, frequency content, attenuation coefficient, can be with using these information
Determine the relevant position of discharge source and measuring device.Pass through the bandwidth and gain relationship of reasonable disposition whole system, this acquisition system
Gain control unite rationally, it is preferable to partial discharge discharge waveform collection effect, it is highly effective to fault location.
Claims (5)
1. a kind of cable oscillatory wave partial discharge fault location system, which is characterized in that including High Frequency Current Sensor, high-frequency electrical
The local discharge signal of induction is input in advance signal wave detector by flow sensor, and advance signal wave detector sentences signal
It is disconnected, and control subsequent variable gain amplifier and select straight-through or amplification factor, signal is by variable gain amplifier later
It is amplified into high-speed AD acquisition card analog-to-digital conversion, data are transmitted to host computer and are analyzed, and handle and show；
The host computer uses the matching algorithm of Partial Discharge, first calculates the sampling location of shelf depreciation input signal,
Waveform, spectrum signature signal；Then the data after big signal are segmented, calculate separately the wave character signal of segmentation,
It finds the wave character to match with the big signal of input and time difference is accurately calculated according to the sampling time point of two signals, from
And it is accurately positioned according to cable length and transmission speed.
2. a kind of cable oscillatory wave partial discharge fault location system according to claim 1, which is characterized in that described
High Frequency Current Sensor is to incude local discharge signal, input of the output end as preposition wave detector based on Rogowski coil principle
End.
3. a kind of cable oscillatory wave partial discharge fault location system according to claim 1, which is characterized in that described
Preposition wave detector is signal peak wave detector, judges the amplitude size of input signal, and according to amplitude judge input signal be into
Signal or reflection signal are penetrated, the amplification factor of variable gain amplifier is controlled.
4. a kind of cable oscillatory wave partial discharge fault location system according to claim 1, which is characterized in that described
Variable gain amplifier is the controllable broadband amplifiers of gain factor, and amplification factor is times optional from 10 times to 100, amplification factor by
The control of preposition wave detector；Variable gain amplification process is as a result, reflection signal decaying strong for shelf depreciation incoming signal amplitude
Greatly, the small feature of signal amplitude is added to advance signal wave detector, detects the signal of input, and the output of advance signal wave detector connects
Entering variable gain amplifier, gain is controlled by the result of sound detector, when guaranteeing to input big signal, variable gain amplifier
Do not amplify or gain is smaller, guarantee that signal is unsaturated by amplifier, when small signal inputs, gain amplification can be by high speed
The identification of AD capture card.
5. a kind of cable oscillatory wave partial discharge fault location system according to claim 1, which is characterized in that described
High-speed AD acquisition card is four-way synchronous acquisition, and sample rate 125M/s, 12 AD precision, input range is ± 1V, is used
DDR3 massive store, sampling duration can arrive 100ms.
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| CN201811072450.6A CN109031077A (en) | 2018-09-14 | 2018-09-14 | A kind of cable oscillatory wave partial discharge fault location system |
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| CN201811072450.6A CN109031077A (en) | 2018-09-14 | 2018-09-14 | A kind of cable oscillatory wave partial discharge fault location system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161381A (en) * | 2019-04-29 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of bushing shell for transformer humidified insulation state evaluating method based on oscillation wave |
| CN115856525A (en) * | 2022-11-08 | 2023-03-28 | 武汉朗德电气有限公司 | Cable partial discharge online monitoring method and system |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1665128A (en) * | 2005-03-30 | 2005-09-07 | 哈尔滨工业大学 | Multi-level auto-gain control integrated circuit system having gain indication function |
| CN202649391U (en) * | 2012-06-29 | 2013-01-02 | 广州供电局有限公司 | Cable defect simulation test system |
| CN103197209A (en) * | 2013-03-27 | 2013-07-10 | 西安电子科技大学 | Partial discharge work frequency synchronization signal sensing device |
| CN203414563U (en) * | 2013-07-01 | 2014-01-29 | 杭州电子科技大学 | Partial discharge AE position detection system |
| CN103901256A (en) * | 2012-12-25 | 2014-07-02 | 北京嘉岳同乐极电子有限公司 | Novel lightning stroke current measuring device |
| CN104749498A (en) * | 2015-01-28 | 2015-07-01 | 西安交通大学 | Portable partial discharge detecting and diagnosing device |
| CN104808121A (en) * | 2015-04-13 | 2015-07-29 | 国家电网公司 | Distributing cable partial discharge test method based on oscillatory wave test |
| CN104913873A (en) * | 2015-06-02 | 2015-09-16 | 西安交通大学 | Multi-factor influence-improved ultrasonic hydraulic measurement method and system |
| CN105116306A (en) * | 2015-09-09 | 2015-12-02 | 国家电网公司 | Acquisition method and device of substation partial discharge live detection electromagnetic interference |
| CN204989403U (en) * | 2015-08-27 | 2016-01-20 | 国家电网公司 | Portable cable partial discharge takes electric detection means |
| CN105515597A (en) * | 2015-12-02 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Automatic gain control circuit for receivers |
| CN105911438A (en) * | 2016-04-13 | 2016-08-31 | 国网湖南省电力公司 | GIS risk evaluation method and GIS risk evaluation system based on partial discharge live detection |
| CN207488428U (en) * | 2017-11-02 | 2018-06-12 | 深圳市朗驰欣创科技股份有限公司 | A kind of partial discharge monitoring device |
-
2018
- 2018-09-14 CN CN201811072450.6A patent/CN109031077A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1665128A (en) * | 2005-03-30 | 2005-09-07 | 哈尔滨工业大学 | Multi-level auto-gain control integrated circuit system having gain indication function |
| CN202649391U (en) * | 2012-06-29 | 2013-01-02 | 广州供电局有限公司 | Cable defect simulation test system |
| CN103901256A (en) * | 2012-12-25 | 2014-07-02 | 北京嘉岳同乐极电子有限公司 | Novel lightning stroke current measuring device |
| CN103197209A (en) * | 2013-03-27 | 2013-07-10 | 西安电子科技大学 | Partial discharge work frequency synchronization signal sensing device |
| CN203414563U (en) * | 2013-07-01 | 2014-01-29 | 杭州电子科技大学 | Partial discharge AE position detection system |
| CN104749498A (en) * | 2015-01-28 | 2015-07-01 | 西安交通大学 | Portable partial discharge detecting and diagnosing device |
| CN104808121A (en) * | 2015-04-13 | 2015-07-29 | 国家电网公司 | Distributing cable partial discharge test method based on oscillatory wave test |
| CN104913873A (en) * | 2015-06-02 | 2015-09-16 | 西安交通大学 | Multi-factor influence-improved ultrasonic hydraulic measurement method and system |
| CN204989403U (en) * | 2015-08-27 | 2016-01-20 | 国家电网公司 | Portable cable partial discharge takes electric detection means |
| CN105116306A (en) * | 2015-09-09 | 2015-12-02 | 国家电网公司 | Acquisition method and device of substation partial discharge live detection electromagnetic interference |
| CN105515597A (en) * | 2015-12-02 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Automatic gain control circuit for receivers |
| CN105911438A (en) * | 2016-04-13 | 2016-08-31 | 国网湖南省电力公司 | GIS risk evaluation method and GIS risk evaluation system based on partial discharge live detection |
| CN207488428U (en) * | 2017-11-02 | 2018-06-12 | 深圳市朗驰欣创科技股份有限公司 | A kind of partial discharge monitoring device |
Non-Patent Citations (2)
| Title |
|---|
| 李建明 等: "局部放电信号波形及频谱特征", 《高电压技术》 * |
| 肖燕 等: "波形匹配追踪算法在多局放脉冲提取中的应用", 《中国电机工程学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161381A (en) * | 2019-04-29 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of bushing shell for transformer humidified insulation state evaluating method based on oscillation wave |
| CN110161381B (en) * | 2019-04-29 | 2021-04-13 | 云南电网有限责任公司电力科学研究院 | Transformer bushing insulation damp state evaluation method based on oscillation waves |
| CN115856525A (en) * | 2022-11-08 | 2023-03-28 | 武汉朗德电气有限公司 | Cable partial discharge online monitoring method and system |
| CN115856525B (en) * | 2022-11-08 | 2024-03-19 | 武汉朗德电气有限公司 | Cable partial discharge on-line monitoring method and system |
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