CN105277856B - Cross-Linked Polythene Cable Joints discharge fault monitoring system and Fault Classification - Google Patents
Cross-Linked Polythene Cable Joints discharge fault monitoring system and Fault Classification Download PDFInfo
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- CN105277856B CN105277856B CN201510807611.1A CN201510807611A CN105277856B CN 105277856 B CN105277856 B CN 105277856B CN 201510807611 A CN201510807611 A CN 201510807611A CN 105277856 B CN105277856 B CN 105277856B
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Abstract
The invention discloses a kind of Cross-Linked Polythene Cable Joints discharge fault monitoring system, including multiple images collecting unit, view data temporary storage location, stereo-picture regression analysis unit, communication and fault alarm unit and power supply power supply unit；The original image at crosslinked polyethylene silicon rubber interface at image acquisition units collection cable connector；The raw image data that view data temporary storage location storage collects；Stereo-picture regression analysis unit one is whether thick assay surface occurs discharge fault, second, reduction crosslinked polyethylene silicon rubber interface failure electrical discharge arc three-dimensional shape, third, assay surface fault discharge arc shape and obtain discharge fault type；Monitor terminal is alarmed or be sent to communication with fault alarm unit analysis result；Power supply power supply unit is powered for all units.Energy of the invention is visual in image, constantly efficiently monitors cable connector health status, and the classification of fast positioning and fault type for cable connector discharge fault provides authentic data.
Description
Technical field
The present invention relates to a kind of joint discharge fault on-line monitoring system and fault type determination methods, more particularly to one kind
Cross-Linked Polythene Cable Joints discharge fault monitoring system and Fault Classification.
Background technology
HV XLPE Power Cable carries the important task of power transmission in cities and towns are modernized, and is power system
Important component.But the ratio of cable intermediate joint breakdown fault accounts for the 31% of cable operation fault sum, and wherein
Because the multilayer dielectricity creeping discharge reason between crosslinked polyethylene-silicon rubber joint causes joint breakdown fault to account for cable connector
The 97% of failure sum.Therefore, fast and effeciently position high-voltage cable joint surface breakdown failure, to improve supply of electric power can
It is significant by property.
Cable and junction malfunction detection at present is broadly divided into on-line monitoring and offline inspection.Offline inspection has OWTS Sassers electric
The test of cable partial discharge, pulse current method (Electromagnetic coupling method) measurement, measuring super low frequency etc.；On-line monitoring includes checking for grounded current
Method, shelf depreciation Capacitance Coupled and inductance actinobolia etc..
1) OWTS Sassers method cable connector discharge test
The test of OWTS Sasser cable connectors shelf depreciation uses damped vibration voltage tester strength of discharge, and combines partial discharge
Alignment system realizes the detection of partial discharge.OWTS wave of oscillation method cable connectors locally put measuring technology, are fixed due to being used during experiment
Inductance L and cable resonance produce high-frequency sasser and pressurizeed, and close to power frequency sine wave, action time is short for its waveform and frequency,
Cable will not be damaged, is relatively adapted to onsite application.Furthermore by interference protection measure, Partial discharge signal can be accurately detected, to cable
Body, annex, joint process etc. have good Detection results, be a kind of effective partial discharge detection method.It is but existing
Field detection workload is very big, it is impossible to effective detection in real time.
2) HFCF sensors (pulse current method) detect
HFCF sensors (pulse current method) detection be mainly used in cable connector partial discharge monitoring system or from
Line detecting system.Pulse current method is by HFCT sensors, the method coupled using electric capacity arm, and it is whole that sensor is arranged on into cable
The appearance of end equipment, measure loop, detection means, without directly contacting, do not influence the operation of equipment with equipment loop.This detection side
Method is extremely low installed in the appearance of cable terminating equipment, the interference of irrelevant signal, testing result reliability due to sensor.
3) ultralow frequency detection cable partial discharge technology
0.1Hz ultralow frequencies technology is applied more common in mesolow cable connector Partial Discharge Detection.Its Cleaning Principle
Similar with OWTS Sassers method survey cable partial discharge, difference is that it uses 0.1Hz high pressure generators to produce pure sine wave high pressure, applies
The shelf depreciation that defect point is excited on detected cable is added to, the coupled capacitor partial pressure of detecting system is followed by detecting the survey of impedance
Loop is measured, partial discharge horizontal survey is carried out using pulse current method.The workload of this detection method is big, it is impossible to effective inspection in real time
Survey.
4) shelf depreciation Capacitance Coupled and inductance actinobolia
Shelf depreciation Capacitance Coupled and inductance actinobolia are to bury coupled capacitor or coupling in cable insulation region of interest
Inductance is closed, to detect the shelf depreciation occurred at interface or conductor end face.This method can be with detection cable failure initial stage
Signal, the expansion of accident can be prevented.But the method for embedded coupled capacitor or coupling inductance has to cable insulation body to be destroyed
Effect, or even directly result in insulation fault.And failure initial stage local discharge signal it is quite faint and disturb it is very big, effectively
Detect that real local discharge signal is difficult greatly.
5) checking for grounded current method
Checking for grounded current method is thought in joint, after the electric discharge of two insulator interfaces, on the grounding electrode of joint
Discharge current can be detected.But the fact is that grounding electrode is connected with the earth, and interface discharge current is to flow through crosslinked polyethylene
The semi-conductive layer and aluminium sheath or cable armour on insulating materials surface, there is no discharge current to flow through or very on grounding electrode
It is faint, it is not easy to detect.
Above cable and junction malfunction detection technique or method are either disturbed big or to destroy insulating body, and effect is poor,
Therefore it is significant to develop more effective detection method.
The content of the invention
For above-mentioned the shortcomings of the prior art, the invention provides a kind of Cross-Linked Polythene Cable Joints to put
Electric fault monitoring system.
Meanwhile present invention also offers a kind of Cross-Linked Polythene Cable Joints discharge fault sorting technique.
In order to solve the above-mentioned technical problem, present invention employs following technical scheme：
Cross-Linked Polythene Cable Joints discharge fault monitoring system, including multiple images collecting unit, view data are kept in
Unit, stereo-picture regression analysis unit, communication and fault alarm unit and power supply power supply unit；Described image collecting unit is adopted
Collect the original image at crosslinked polyethylene-silicon rubber interface at cable connector；Described image data temporary storage location storage image gathers
The raw image data that unit collects；The stereo-picture regression analysis unit one is whether coarse analysis interface discharges
Failure, second, the three-dimensional shape of reduction crosslinked polyethylene-silicon rubber interface failure electrical discharge arc, third, labor interface failure
Electrical discharge arc form and obtain discharge fault type；The communication is with fault alarm unit stereo-picture regression analysis unit
Analysis result is alarmed or is sent to monitor terminal and further handles；The power supply power supply unit is image acquisition units, picture number
Powered according to temporary storage location, stereo-picture regression analysis unit and communication with fault alarm unit.
Cross-Linked Polythene Cable Joints discharge fault sorting technique provided by the invention, is employed above-mentioned in the method
Cross-Linked Polythene Cable Joints discharge fault monitoring system, this method comprise the following steps：1) utilize and be arranged at cable connector
Multiple pinhole cameras gather the picture of cable connector in real time, establish data fact base to judge whether joint occurs electric discharge
Plinth；2) according to the view data to gathering in real time, judge whether each pixel value is more than setting value in image, if being set more than this
Definite value, then need to keep in this view data, and further carefully analyze, be to prevent power supply power supply unit failure and energy vacating space
The continuous collection offer condition in real time of image acquisition units；3) by discharge arc length, thickness change, area, position and
No, distributional pattern feature analysis is fixed in position, provides corresponding discharge fault type.
The beneficial effects of the invention are as follows：Energy of the invention is visual in image, real-time and efficiently monitors cable connector health status, is
The fast positioning of cable connector discharge fault and the classification of fault type provide authentic data, can greatly mitigate track walker's labor
Fatigue resistance and efficiency operation, the reliability for improving power supply are significant.
Brief description of the drawings
Fig. 1 is the schematic view of the mounting position of Cross-Linked Polythene Cable Joints discharge fault monitoring system image acquisition units；
Wherein, 1-two insulator interface；2-inner wire and interior semi-conductive layer；3-pinhole cameras；4-filler；5-insulation
Oversheath；6-transparent joint outer semiconducting layer or screen layer；7-crosslinked polyethylene main insulating layer；8-transparent silicone rubber is exhausted
Edge material.
Fig. 2 is the composition schematic diagram of Cross-Linked Polythene Cable Joints discharge fault monitoring system.
Fig. 3 is the flow chart of Cross-Linked Polythene Cable Joints discharge fault classification.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the schematic view of the mounting position of Cross-Linked Polythene Cable Joints discharge fault monitoring system image acquisition units,
Fig. 2 is the composition schematic diagram of Cross-Linked Polythene Cable Joints discharge fault monitoring system.Cross-Linked Polythene Cable Joints electric discharge event
Hindering monitoring system includes multiple images collecting unit, view data temporary storage location, stereo-picture regression analysis unit, communication and event
Hinder alarm unit and power supply power supply unit.
The original image at crosslinked polyethylene-silicon rubber interface, IMAQ list at image acquisition units collection cable connector
Member should install multiple images collecting unit, IMAQ according to actual conditions such as the thickness of cable, the length of two insulator interfaces
Unit installation is preferably with array, to install, to design, the reduction of image etc..Due to current high-voltage cross-linking polythene electric power
Cable and joint, semi-conductive layer etc. use opaque material substantially, to collect interface electric discharge optical information, crosslinked polyethylene electricity
Power cable, joint and semi-conductive layer etc. all should use high transparency material, and cable armour should open aperture, in order to IMAQ list
The installation of member.
The raw image data that view data temporary storage location storage image collecting unit collects；View data temporary storage location
Need the initial data of storage collecting unit, the arc data that storing stereoscopic image restoring analytic unit is reduced again, with right
Answer power supply power supply unit dead electricity and convenient analysis.
Stereo-picture regression analysis unit one is whether coarse analysis interface occurs discharge fault, second, reduction is crosslinked poly- second
The three-dimensional shape of alkene-silicon rubber interface failure electrical discharge arc, because the view data that single image collecting unit obtains is one
2-D data on individual face, the drum-shaped interface in not actual crosslinked polyethylene-silicone rubber for cable, third, labor interface
Fault discharge arc shape and obtain discharge fault type.
Communication and fault alarm unit the alarm of the analysis result of stereo-picture regression analysis unit or by optical fiber or
Other forms are sent to monitor terminal (using network computer) and further handled.Power supply power supply unit be image acquisition units,
View data temporary storage location, stereo-picture regression analysis unit and communication are powered with fault alarm unit.
Cross-Linked Polythene Cable Joints discharge fault sorting technique, by discharge arc length, thickness change, area,
The analysis of the morphological features such as position, distribution, provides corresponding discharge fault type, and this method comprises the following steps (such as Fig. 3 institutes
Show)：1) picture of cable connector is gathered in real time using the multiple pinhole cameras for being arranged at cable connector, to judge that joint is
The true basis of data is established in no generation electric discharge；2) according to the view data to gathering in real time, judge that each pixel value is in image
It is no to be more than setting value, if being more than this setting value, need to keep in this view data, and further carefully analyze, to prevent power supply
Simultaneously energy vacating space provides condition to power supply unit failure for the continuous collection in real time of image acquisition units；3) by electrical discharge arc
No, distributional pattern feature analysis is fixed in length, thickness change, area, position and position, provides corresponding discharge fault class
Type.
Its determination methods is：1) it is rough to judge in image whether is each pixel value according to the view data that gathers in real time
More than some setting value, if being more than this setting value, need to keep in this view data and concurrently veer away electric fault alarm signal；2)
The cylindrical coordinate using cable inner conductor axle center as Z coordinate is established, the data of multiple images collecting unit are carried out computing, utilize post
Coordinate system describes the solid shape of electrical discharge arc；3) whether analysis discharge fault runs through type failure, is then sent out if penetrability failure
One-level catastrophe failure alarm signal is sent, secondary failure alarm signal is then sent if non-through failure；3) from arc length side
To comprehensively if the change of electric arc thickness is little, interface failure source is comprehensive aging, is such as made moist；If electric arc thickness changes greatly,
Then interface failure source may be local serious deterioration, either have air gap generation or local serious change as local cable silicone grease disappears
Shape；If 4) arc length direction has locally without arclight, interface is not in place in erection stage processing, introduces the source of trouble,
Such as small conductive bits；If 5) arc position real-time change, the comprehensive aging in interface, if arc position does not change, interface
Local serious aging, it is abnormally dangerous.
Electric discharge picture transfer to monitor terminal is subjected to data analysis and storage, judges the specific failure of cable connector electric discharge
Type；Its determination methods is：Discharge picture in analysis above-mentioned steps in real time, and reduction electrical discharge arc solid shape is with position.Pass through
Analysis to electrical discharge arc form with position, judges discharge fault type.It is embodied in (long to the form of electrical discharge arc
Degree, thickness, area etc.) analyzed with position, describe in detail as follows：
The type of failure judgement：Set the higher limit of one group of light pixel number every with lower limit, detection in monitor terminal
One frame picture has the number of the pixel of light, and when the number for having light pixel exceedes preset lower limit, extraction period picture group is carried out
Analysis in real time, you can restore this group of electrical discharge arc concrete form (length, thickness, area that show as electric arc) with position.
The analysis of electrical discharge arc form：If the length of electrical discharge arc, thickness, area exceed the preset value upper limit, illustrate
Such fault type is Severe failure (through breakdown)；If the length of electrical discharge arc, thickness, area between higher limit with
Between lower limit, then it is GENERAL TYPE failure (non-penetrating type breakdown) to illustrate such failure；In view of the cable connector of different model is thick
Thin difference, it can be set when setting higher limit with lower limit according to specific cable connector model.
The analysis of electrical discharge arc position：If electrical discharge arc repeatedly appears in same position, illustrate that the discharge fault has
Develop into the trend of through failure；It is no it, then without the trend for developing into through failure.
Communicate and receive the analysis result of monitor terminal from fault alarm unit and sent not according to the different of analysis result
The alarm signal of same level, it is embodied in one-level alarm signal and secondary alarm signal.If failure is extremely serious, alarm signal
Number it is one stage signal, transmission feedback signal is started relay protection system and same by communication and fault alarm unit to monitor terminal
When to staff send alarm signal；Not extremely serious if failure is general, then alarm signal is second signal, communication
Then only alarm signal is sent with fault alarm unit to staff.
Energy of the invention is visual in image, real-time and efficiently monitors cable connector health status, is cable connector discharge fault
The classification of fast positioning and fault type provides authentic data, can greatly mitigate track walker's labor intensity and high efficiency work
Make, the reliability for improving power supply is significant.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent substitution, and without departing from the objective and scope of technical solution of the present invention, it all should cover at this
Among the right of invention.
Claims (2)
1. Cross-Linked Polythene Cable Joints discharge fault monitoring system, it is characterised in that：Including multiple images collecting unit, image
Data temporary storage location, stereo-picture regression analysis unit, communication and fault alarm unit and power supply power supply unit；Described image is adopted
Collect the original image at crosslinked polyethylene-silicon rubber interface at unit collection cable connector；Described image data temporary storage location stores
The raw image data that image acquisition units collect；The stereo-picture regression analysis unit one be coarse analysis interface whether
Generation discharge fault, second, the three-dimensional shape of reduction crosslinked polyethylene-silicon rubber interface failure electrical discharge arc, third, labor
Interface failure electrical discharge arc form and obtain discharge fault type；The communication is with fault alarm unit stereo-picture reduction point
The analysis result of analysis unit, which is alarmed or is sent to monitor terminal, further to be handled；The power supply power supply unit is IMAQ list
Member, view data temporary storage location, stereo-picture regression analysis unit and communication are powered with fault alarm unit.
2. Cross-Linked Polythene Cable Joints discharge fault sorting technique, it is characterised in that employ claim 1 in the method
Described Cross-Linked Polythene Cable Joints discharge fault monitoring system, the Cross-Linked Polythene Cable Joints discharge fault classification side
Method, comprise the following steps：1) picture of cable connector is gathered in real time using the multiple pinhole cameras being arranged at cable connector,
The true basis of data is established to judge whether joint occurs electric discharge；2) according to the view data to gathering in real time, judge in image
Whether each pixel value is more than setting value, if being more than this setting value, needs to keep in this view data, and further carefully divide
Analysis, condition is provided for the continuous collection in real time of image acquisition units to prevent power supply power supply unit failure and energy vacating space；3) lead to
Cross and no, distributional pattern feature analysis is fixed to discharge arc length, thickness change, area, position and position, provide corresponding
Discharge fault type.
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| CN201510807611.1A CN105277856B (en) | 2015-11-20 | 2015-11-20 | Cross-Linked Polythene Cable Joints discharge fault monitoring system and Fault Classification |
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Families Citing this family (5)
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| CN106383286A (en) * | 2016-11-30 | 2017-02-08 | 国网福建省电力有限公司 | Electric power line fault alarm device |
| CN110261746B (en) * | 2019-07-08 | 2021-08-24 | 清华大学深圳研究生院 | Cable defect detection method based on periodic attenuation characteristics of oscillating wave voltage |
| CN111025091B (en) * | 2019-11-19 | 2022-04-26 | 云南电网有限责任公司临沧供电局 | Intelligent evaluation method for uneven damp state of urban distribution network cable |
| CN111080578B (en) * | 2019-11-27 | 2022-08-16 | 西安交通大学 | Method for evaluating danger degree of arc fault by utilizing image recognition |
| CN113030626A (en) * | 2021-03-25 | 2021-06-25 | 苏州电器科学研究院股份有限公司 | Simulated fault arc detection system |
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