CN206132913U - Special high frequency cable partial discharge detector device that can fix a position - Google Patents
Special high frequency cable partial discharge detector device that can fix a position Download PDFInfo
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- CN206132913U CN206132913U CN201620177227.8U CN201620177227U CN206132913U CN 206132913 U CN206132913 U CN 206132913U CN 201620177227 U CN201620177227 U CN 201620177227U CN 206132913 U CN206132913 U CN 206132913U
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Abstract
The utility model discloses a special high frequency cable partial discharge detector device that can fix a position, its characterized in that: data synchronous sampling module includes that the passageway is gathered to two high speeds and the passageway is gathered to a low -speed, and two external superfrequency sensors and a power frequency signal sensor are used for the following superfrequency partial discharge signal of synchronous sampling 1GHz, environmental signal and power frequency voltage signal, and the superfrequency sensor is directly settled on the cable, the synchronizing data that quintuplet method integrated analysis gathered is passed through to the analysis processes module, and effective recognition cable partial discharge signal and external noise disturb, and the location is put in further realization office, the power goes to make an uproar and prevents when the module is used for outdoor use that noise from being introduced by portable power, the user control terminal has data acquisition and shows that result analysis, historical data look over and report schedules with real time printing. The utility model discloses can detect and fix a position power cable's the partial discharge condition, improve the reliability that partial discharge detected, the accurate judgement partial discharge condition.
Description
Technical field
The utility model is related to power system Partial Discharge Detection field, more particularly to a kind of orientable superfrequency cable
Local discharge detection device.
Background technology
In recent years, accounting of the high pressure XLPE power cables in urban electric power circuit is increasing, by attention degree also day
Cumulative height, in city residents' energy consumption is ensured very important effect is played.It is domestic from starting the 80s and 90s in last century to introduce
The XLPE cable of 110kV electric pressures, the partial cables being also currently running till now come into " midlife " of predetermined age,
Even there is quite a few high-tension cable to be in excess load running status in spite of illness, there is cable body quality in addition, annex is installed
The problems such as laying quality and external force are destroyed, more causes this problem to project further, High Voltage XLPE Power Cable fault rate also more and more higher.
Research both at home and abroad shows that cable major insulation defect is the main cause for causing cable fault, and detection method for local discharge is state
Recognize detection cable insulation defect most effectual way in the technical field of border altogether.Experts and scholars both domestic and external and IEEE, IEC,
The internal authority such as CIGRE organization is more consistent to recommend partial discharge test as being that cable and its annex insulation status are evaluated
The best approach.Therefore, in order to avoid the frequent generation of cable fault, cable hidden danger is found before generation accident, effectively local
Discharge examination is essential.
The method of cable local discharge detection is a lot, is also mainly height in the electric on-line measurement method for using at the scene now
Frequency Partial Discharge Detection method.Traditional concept thinks that the primary bands of local discharge signal are in below 100MHz, therefore high-frequency detection
The groundwork frequency band of method has been completely suitable for the Partial Discharge Detection of XLPE cable, but a large amount of High Voltage XLPE Power Cable both at home and abroad
Partial discharge detection result shows that the Detection results of high-frequency detection method are limited, with the increase of range of application, has emerged increasingly
Many shortcomings and deficiencies, easily produce erroneous judgement, and particularly current criterion is mainly derived from U- Φ spectrograms, discharge capacity, time domain letter
Number, because parameter is few, faciostenosis is reacted, result is even more easily caused for doubtful so that operation department has no way of doing it defect elimination.Early have
Research shows that up to upper GHz, superfrequency technology has obtained ripe application to the frequency of local discharge signal on GIS, but in electricity
Still with high frequency partial discharge detection technology as main flow on cable.High frequency partial discharge detection equipment is limited in that one is to obtain signal band
It is too low, for example, low frequency (30kHz～300kHz), intermediate frequency (300kHz～3MHz), high frequency are divided according to China's electromagnetic signal frequency range
(3MHz～30MHz), very high frequency(VHF) (30MHz～300MHz), superfrequency (300MHz～3GHz) etc., the shelf depreciation of prior art
Testing equipment can only measure high frequency or very high frequency(VHF) frequencies below, it is impossible to measure ultrahigh-frequency signal, therefore lost the extra-high of preciousness
Frequency information.Two is that the method for discrimination to shelf depreciation is single, is also to continue with continuing to use traditional discharge capacity-phase place spectrogram or signal wave
Shape frequency spectrogram, three is that local discharge signal that cannot be to measuring is positioned, and four is measurement sensor not direct detection electricity
Cable body, but ground line signals are obtained, introduce noise jamming big.Therefore, now domestic and international main flow high frequency office to put equipment universal
There are problems that the problem of the running status to cable " be unable to explain clearly, road fail to understand ", the conclusion for drawing also tends to be to allow operator headache
" doubtful electric discharge ", also or obtain discharge signal, but do not know that it comes from where.
Due to there are the problems referred to above, in cable local discharge field, exigence one kind can completely gather local and put
Electric signal, accurately judges superfrequency cable local discharge state and has the device of positioning function.
Utility model content
In order to overcome the indeterminacy of existing cable local discharge testing equipment and cannot realize what cable local discharge was positioned
Defect, the utility model provides a kind of orientable superfrequency cable local discharge detection device, is put using superfrequency local
Electro-detection and independent multi-channel synchronous technology, sensor direct measurement cable under test body or annex, low frequency, height in accurate acquisition
Frequently, very high frequency(VHF) and ultrahigh frequency partial discharge signal, obtain complete cable local discharge information, are effectively gone using double passage differential
Make an uproar, feature confidential interval recognizes the real Partial discharge signal from cable, the parametric synthesis of 5-linked fado judges shelf depreciation situation simultaneously
Realize the positioning of shelf depreciation defect, effectively support to find that dangerous electric cable stoppage is provided in advance, it is ensured that power cable and its
The safe operation of annex.
The utility model is using technical scheme：
A kind of orientable superfrequency cable local discharge detection device, including：Sensor assembly, synchronous data sampling mould
Block, analysis and processing module, denoising power module and user control terminal；
Wherein, the sensor assembly includes two extra-high video sensors and a power frequency component sensor, described two
Extra-high video sensor includes the first extra-high video sensor and the second extra-high video sensor, is the superfrequency sensing of same model parameter
Device, for obtaining cable local discharge signal；The power frequency component sensor is used to obtain power frequency component；The data syn-chronization is adopted
Collection module includes two high speed acquisition passages and a low speed acquisition channel, described two high speed acquisition passage difference external first
Extra-high video sensor and the second extra-high video sensor；The low speed acquisition channel connects the power frequency component sensor；Data are same
Walk local discharge signal, ambient signal and the power frequency component of acquisition module synchronous acquisition superfrequency and following frequency range.
The denoising power module includes compact power, and low pass power-supply filter is dry with shielded power supply line and anti-electromagnetism
Radome is disturbed, for the noise jamming for preventing from being introduced by compact power indoors or when outdoor installation is used.
The user control terminal shows for data acquisition, interpretation of result, historical data are checked and real time print form.
Further, the first extra-high video sensor in the extra-high video sensor is placed in cable body to be detected or its electricity
Outside cable fittings, two kinds of condenser type and electromagnetic type are divided into based on Cleaning Principle, electromagnetic type superfrequency sensor predominantly detects 30MHz
To 1.0GHz signals, cable under test placement is adjacent to, the detectable 1.5GHz signals below of the extra-high video sensor of condenser type, this practicality is new
The extra-high video sensor of the preferred condenser type of type, setting to wind around on cable under test, identical another extra-high keep pouring in
Sensor (the i.e. second extra-high video sensor) is placed in the environment away from the first extra-high video sensor and cable under test preset distance
Environmental disturbances signal can be synchronously detected, the preset distance is, for example, 2 meters；It is capable of achieving to remove environment introducing using double passage differential
Noise, power frequency component sensor be then placed on on the same phase cable under test of the first extra-high video sensor.
Further, the shielded enclosure for anti electromagnetic interference is made up of heavy alloy net, is placed in the output of 220V alternating voltages
Compact power outside, a power-supply filter is connected between local discharge detection device and compact power, and will be anti-electric
Magnetic disturbance Shielding Case grounding reaches the effect for removing power supply disturbance.
Further, two high speed acquisition passages can synchronous acquisition frequency in all signals of below 1.5GHz, lock in time essence
Degree is not more than 0.2ns.
Further, the 5-linked method that analysis and processing module is used includes discharge capacity-phase place spectrogram, feature confidential interval, electric discharge
Confidence level, five separate standards of periodic discharging probability and discharge capacity, referred to as " 5-linked method ", for qualitative and quantitative joint electricity are passed judgment on
Cable shelf depreciation and its order of severity；So-called electric discharge confidence level to be referred to and remove interval outer noise data by first step confidential interval
Remove in interval after noise data with second step binary channels contrast difference, based on institute in big data Statistics analysis confidential interval
Residues is according to the possibility for local discharge signal；Frequency and conduct that so-called periodic discharging probability sign local discharge signal occurs
One of criterion of the defect order of severity, the weight and pass based on discharge signal in one discharge cycle of a large amount of analysiss of statistical data
System.
Further, the first extra-high video sensor and the second superfrequency sensor distance 2m and the above are placed in into same to treat
On detection cable, based on high accuracy data synchronous acquisition, can be by short distance time difference method according to signal propagation direction and amplitude
Contrast to realize the positioning of local discharge signal.
The utility model also proposes a kind of orientable superfrequency cable local discharge detection method, is examined using above-mentioned electric discharge
Survey device to measure, concrete steps include：
First extra-high video sensor is disposed close to into cable position, the second extra-high video sensor is placed on around cable
A position in environment；Gather measurement end signal FA that the first extra-high video sensor detects and the second extra-high video sensor is detected
Environment end signal FB；Collection power frequency component sensor obtains cable power frequency component SA；The measurement end signal FA and environment end
By the high speed acquisition channel transfer in synchronous data sampling module to analysis and processing module, the power frequency component passes through signal FB
Low speed acquisition channel is transferred to analysis and processing module；
The synchrodata that the analysis and processing module is collected by " 5-linked method " comprehensive analysis, removes outside noise and does
Disturb, contrast shelf depreciation realizes partial discharge location according to case automatic identification cable local discharge signal in expert database, stores
Valid data；" the 5-linked method " analysis discharge capacity-phase place spectrogram, feature confidential interval, electric discharge confidence level, periodic discharging probability
And the parametric data of five separate standards of discharge capacity；
The utility model can effectively gather high frequency and following frequency using simple, sensor install convenient, sampling precision height
Rate, very high frequency(VHF), ultrahigh-frequency signal, process is analyzed to gathered data using expert database automatically using " 5-linked method ",
Accurate cable local discharge situation is obtained without the need for artificially be analyzed to signal, with powerful antijamming capability and is had
Source positioning function is put in the office of effect.The utility model can effectively make up existing cable Partial Discharge Detecting Technology analysis result by people
Larger, test result is affected mostly to be uncertain doubtful result, cannot believe local discharge signal source and noise for detection error
It is blank that number source carries out the key technology that effectively positioning etc. cannot be captured.
Description of the drawings
The detection means system block diagram that Fig. 1 is adopted by the utility model.
Fig. 2 (a) is the utility model signal processing and analysis and Partial Discharge Detection FB(flow block).
Fig. 2 (b) is that the utility model positions partial discharge position FB(flow block).
Fig. 3 is Partial Discharge Sources positioning principle block diagram.
Fig. 4 is power supply denoising device connection figure in the utility model.
Fig. 5 is the utility model functional framework figure.
Specific embodiment
The utility model is elaborated below in conjunction with the accompanying drawings.
Fig. 1 is detection means system architecture of the present utility model, mainly including sensor assembly, synchronous acquisition module, point
Analysis processing module, denoising power module and user control terminal.Wherein sensor assembly includes two extra-high video sensors and
Power frequency component sensor, power frequency component sensor and an extra-high video sensor are placed on cable under test for obtaining local
Discharge signal FA and power frequency component SA, the extra-high video sensor of another is placed in the air of measuring environment, for detecting environment
Signal FB；Synchronous acquisition module includes that two high speed acquisitions for being respectively intended to receive local discharge signal FA and ambient signal FB are led to
Road, a low speed acquisition channel and high-precise synchronization clock for being used for receiving power frequency component SA can precise acquisition superfrequency sensing
The signal of the output of device, triple channel synchronous error is not more than 0.2ns, to realize positioning function provide hardware supported；At analysis
Reason module includes polycaryon processor and mass storage, the synchrodata collected using " 5-linked method " comprehensive analysis, bilateral
Road synchronous difference removes outside noise interference, is put using expert database automatic identification cable local discharge signal, and realization office
The positioning in source, valid data are stored into mass storage；Denoising power module includes portable power source system, low pass filtered
Ripple device denoising module, power module, the normal use for device provides electric power support, while preventing by just during outdoor use device
Take the noise jamming of formula power-supply system introducing；User control terminal module includes peripheral interface and user control terminal, shows
Show that connection provides two kinds of interfaces, the respectively personal PC based on RJ45 is remotely accessed and the display based on VGA connects, there is provided
USB interface is used as peripheral hardware interface channel, it can also be used to which the movable storage device of data is derived, and user control terminal can realize number
Show according to collection, interpretation of result is put in office, and fault location is put in office, and historical data is checked and account on the spot export function.
Fig. 2 (a) is general measure data analysis flow process, and the utility model measure field signal time first and amplitude are believed
Breath, specially：Collection measurement end signal FA and environment end signal FB, while the zero point moment is calculated using power frequency synchronizing signal SA,
Complete the synchronous abstraction function of signal.For the on-site signal for collecting is measured at end signal FA and environment end signal FB
Reason, to measuring end signal FA and environment end signal FB time-domain and frequency-domain feature Fuzzy contrast difference, statistics discharge capacity and phase are carried out
Position information, can obtain initial data spectrogram.On the one hand, initial data spectrogram is further analyzed, it is on the other hand, original
Data spectrogram is added to initial data spectrogram storehouse as data information, and initial data spectrogram storehouse is updated.Known according to pattern
The feature confidential interval of initial data spectrogram is not analyzed with neural network theory method, and then obtains discharge capacity-phase place
Spectrogram, and further analyze discharge capacity, electric discharge confidence level, periodic discharging probability level parameter.The utility model concern discharge capacity-
Phase place spectrogram, feature confidential interval, electric discharge confidence level, five shelf depreciation independent parameters of periodic discharging probability and discharge capacity, lead to
The analysis of each independent parameter is crossed, the signal to detecting is identified, judge whether it is local in cable by " 5-linked method "
Discharge signal and analysis cause the order of severity of the defect of the shelf depreciation, provide rational maintenance suggestion.This is cable local
The signal processing and analysis flow process of discharge examination, major function is to accurately identify local discharge signal, is being found that shelf depreciation letter
After number, in addition it is also necessary to relocate sensor, the partial discharge positioning method provided using the utility model carries out Partial Discharge Sources
Positioning, such as Fig. 2 (b) show positioning analysis flow process, Jing after Fig. 2 (a) methods identification local discharge signal, two extra-high is kept pouring in
Sensor is placed on the problem cable accessory side while measuring, and the extra-high video sensor in the position of synchronous acquisition 1 and 2 positions are extra-high
The discharge information that video sensor is obtained, by " 5-linked method " local discharge signal is recognized, to the channel signal of moment two width is carried out
Value and time difference information are extracted, and using short distance time difference method the local discharge signal source direction is judged.Further details please
With continued reference to Fig. 3.
Fig. 3 is the positioning principle schematic diagram of the utility model Partial Discharge Sources.Fig. 3 illustrates one section of cable, is also connected with thereon
Have a cable accessory (cable accessory and cable belong to two kinds of equipment, cable accessory refer in particular to when cable length is not enough or cable with
Trolley line jointing used when connecting).Measured twice for same cable annex, by measurement result twice
Comprehensive analysis, judges the local discharge signal that detects from this cable accessory, or the left direction by the cable accessory or
Right direction propagates to measurement position, and this is the on-the-spot test implementation of short distance time difference method.With specific reference to Fig. 3, wherein 1 is
Superfrequency sensors A, 2 is video sensor B extra-high with A identicals, and 3 is signal processing apparatus, and superfrequency sensors A and B is same
When be placed on the cable body of cable accessory one end, be spaced L=2 rice, synchronous acquisition obtain cable local discharge signal, from
Using short distance time difference method comparison signal transmission time difference and amplitude size in derived data, the direction of propagation of signal is obtained.
After completing previous step measurement, superfrequency sensors A is placed on position 4, superfrequency by mobile the utility model device to position 6
Sensor B is placed on position 5, same 2 meters of interval, the same cable local discharge signal that synchronous acquisition is obtained, from derived
The direction of propagation of the now signal is obtained in data, if twice detection judge signal source direction conversely, if detection signal as by
The signal that cable accessory is produced is surveyed, the cable accessory can successfully be positioned；If twice detection judges signal source direction
Unanimously, extra-high video sensor B is pointed in direction by superfrequency sensors A, then detection signal travels to this test point for the direction
Signal, can along judge direction proceed detection positioning work, until finding signal source, and it is accurately positioned.
Fig. 4 is the structure of the denoising power module used when without standard civil power, and 7 is to be made up of heavy alloy net in figure
Totally-enclosed shielded enclosure for anti electromagnetic interference, 8 is compact power, and 9 is low pass power filtering module, and 10 is band shielded power supply line,
11 is the utility model cable superfrequency local discharge detection device, and compact power is placed on into shielded enclosure for anti electromagnetic interference
In, using band shielded power supply line compact power is connected with superfrequency partial discharge detection device by low pass power filtering module,
Shielded enclosure for anti electromagnetic interference needs ground connection, superfrequency local discharge detection device protective grounding, you can realize power supply denoising effect.
Fig. 5 is the utility model functional framework, and user can realize that data acquisition shows using device of the present utility model,
Interpretation of result is put in office, and fault location is put in office, and historical data is checked and account on the spot export function.
Embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited, it is every
The equivalent structure made using the utility model specification and accompanying drawing content or equivalent flow conversion, or be directly or indirectly used in
Other related technical fields, are included in the same manner in scope of patent protection of the present utility model.
Claims (4)
1. a kind of orientable superfrequency cable local discharge detection device, it is characterised in that include：Sensor assembly, data
Synchronous acquisition module, analysis and processing module, denoising power module and user control terminal；
Wherein, the sensor assembly includes two extra-high video sensors and a power frequency component sensor, described two extra-high
Video sensor includes the first extra-high video sensor and the second extra-high video sensor, is the extra-high video sensor of same model parameter；
The synchronous data sampling module includes two high speed acquisition passages and a low speed acquisition channel, and described two high speeds are adopted
Collection passage distinguishes external first extra-high video sensor and the second extra-high video sensor, and the low speed acquisition channel connects the power frequency
Signal transducer；
The denoising power module includes compact power, low pass power-supply filter, band shielded power supply line and anti-electromagnetic interference screen
Cover cover.
2. a kind of orientable superfrequency cable local discharge detection device according to claim 1, it is characterised in that institute
State the first extra-high video sensor to be placed in outside cable body to be detected or its cable accessory, setting is treated to wind around
Survey on cable, the second extra-high video sensor is placed in the environment away from 2 meters of the first extra-high video sensor and cable under test
Synchronous detection environmental disturbances signal, power frequency component sensor is then placed on same phase cable under test.
3. a kind of orientable superfrequency cable local discharge detection device according to claim 2, it is characterised in that：Institute
Extra-high video sensor is stated from condenser type or electromagnetic type.
4. a kind of orientable superfrequency cable local discharge detection device according to claim 1, it is characterised in that：Institute
State shielded enclosure for anti electromagnetic interference to be made up of heavy alloy net, be placed in outside the portable power source of 220V alternating voltages output, office
Connect a power-supply filter between portion's discharging detection device and portable power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620177227.8U CN206132913U (en) | 2016-03-09 | 2016-03-09 | Special high frequency cable partial discharge detector device that can fix a position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620177227.8U CN206132913U (en) | 2016-03-09 | 2016-03-09 | Special high frequency cable partial discharge detector device that can fix a position |
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| CN206132913U true CN206132913U (en) | 2017-04-26 |
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| CN201620177227.8U Active CN206132913U (en) | 2016-03-09 | 2016-03-09 | Special high frequency cable partial discharge detector device that can fix a position |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459247A (en) * | 2018-03-19 | 2018-08-28 | 浙江图维科技股份有限公司 | A kind of high-voltage cable joint partial discharge detection position indicator and partial discharge detection localization method |
| CN108717152A (en) * | 2018-04-09 | 2018-10-30 | 保定华创电气有限公司 | A kind of GIS partial discharge localization method based on interval statistics algorithm |
-
2016
- 2016-03-09 CN CN201620177227.8U patent/CN206132913U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459247A (en) * | 2018-03-19 | 2018-08-28 | 浙江图维科技股份有限公司 | A kind of high-voltage cable joint partial discharge detection position indicator and partial discharge detection localization method |
| CN108717152A (en) * | 2018-04-09 | 2018-10-30 | 保定华创电气有限公司 | A kind of GIS partial discharge localization method based on interval statistics algorithm |
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Addressee: WUHAN HUAWEI ZHONGKE ELECTRIC POWER CO., LTD. Document name: Notification to Make Rectification |
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