CN110187236A - A kind of midium voltage cable open-circuit fault on-line monitoring system and method based on SSTDR - Google Patents
A kind of midium voltage cable open-circuit fault on-line monitoring system and method based on SSTDR Download PDFInfo
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- CN110187236A CN110187236A CN201910507814.7A CN201910507814A CN110187236A CN 110187236 A CN110187236 A CN 110187236A CN 201910507814 A CN201910507814 A CN 201910507814A CN 110187236 A CN110187236 A CN 110187236A
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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
- G01R31/08—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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- 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
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
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Abstract
The present invention proposes a kind of midium voltage cable open-circuit fault on-line monitoring system and method based on SSTDR, method based on SSTDR, using the signal after PN code and sine wave modulation as detection signal, with excellent correlation properties and wider frequency spectrum, not only it is able to achieve on-line checking, and positioning accuracy is high, strong antijamming capability is very suitable for midium voltage cable fault detection.
Description
Technical field
The invention belongs to technical field of electric power, are related to the fault detection of midium voltage cable, are a kind of middle piezoelectricity based on SSTDR
Cable open-circuit fault on-line monitoring system and method.
Background technique
Middle and low voltage network connects factory, cell, user, is the critical infrastructures of service economy social development.For
Electricity, which interrupts, can seriously affect production and living order, cause Socie-economic loss, people's life and property safety, even cause confusion
With social unrest event.So far, more than 380 Wan Gongli of 6-20kV line length of the current operation and maintenance of State Grid Corporation of China,
More than 320 Wan Gongli of overhead transmission line, more than 60 Wan Gongli of cable run are distributed in residential area, all trades and professions factory, Urban Underground sky
Between the magnanimity such as equal 460 Yu Wantai of distribution transformer and ring network cabinet, distribution box, ammeter box power supply and distribution infrastructure.In addition
Low pressure 400V route is mainly in interlaced arrangements such as residential blocks, and due to residential block facility reconstruction etc., site environment variation is frequent, failure
Incidence is higher, is difficult to search fault point after failure, and power supply reliability ensures that pressure is big, health monitoring, event to distribution network
Quick positioning, lookup and fault recovery after barrier early warning and alert and failure generation are the scientific research tasks of a chronicity.
Low and medium voltage distribution network has the characteristics that a little more, wide, route length, and number of devices is big, has a very wide distribution, communication environment
It is complicated.Grid company power distribution network scale is more and more big, and cable rate steps up, and urbanization process is accelerated, power distribution network dilatation liter
Frequently, after especially load density increases, the probability that cable breaks down is stepped up for grade transformation.Current cable fault is most
It is all offline inspection, and detection rates are slower.Therefore, the cable fault on-line monitoring system with accurate, fast slowdown monitoring is aobvious
It obtains particularly important.
Bounce technique acquires the reflection signal of fault point by sending detection signal into cable under test, according to anti-
Signal is penetrated relative to the variation of detection signal to determine fault type and positioning failure distance.Currently, bounce technique mainly includes TDR
(Time Do-main Reflectometry)、FDR(Frequency Domain Reflectometry)、STDR
(Sequence Time Domain Reflectometry) and SSTDR (Spread-Spectrum Time-Domain
Reflectometry).TDR sends a burst pulse into cable under test, and it is certain that FDR sends frequency step into cable under test
One group of sine wave.TDR and FDR technology is more mature, simple and accurate, economic and reliable, thus is widely used, particularly suitable for communication electricity
Cable fault detection.However since detection signal will cause influence to the work of cable, they cannot carry out on-line checking to cable.
STDR sends PN code into cable under test, and PN code does not influence the normal work of cable, it is thus possible to realize on-line checking.SSTDR
Using the signal after PN code and sine wave modulation as detection signal, there is excellent correlation properties and wider frequency spectrum, not only
It is able to achieve on-line checking, and positioning accuracy is high, strong antijamming capability is very suitable for midium voltage cable fault detection.
Spread spectrum technique is in an increasingly wide range of applications in fields such as communication, navigation, measurements.Spread spectrum technique
Basis is Shannon (Shannon) channel capacity formula.
C is channel capacity (bit/s) in formula, and B is the bandwidth (Hz) of channel, and S is the signal power (W) of channel output, and N is
The additive white Gaussian noise power (W) of channel output.Can be seen that from the formula when the timing of channel capacity one, channel width with
Signal-to-noise ratio inverse correlation.The one of spread spectrum technique is big, and advantage is, can be with by increasing bandwidth in the case where obtaining same channel capacity
Reduce the requirement to signal-to-noise ratio, there is very strong anti-interference ability.
Summary of the invention
The problem to be solved in the present invention is: for the power grid actual conditions of low and medium voltage distribution network, how online fast slowdown monitoring
Cable fault.
The technical solution of the present invention is as follows: a kind of midium voltage cable open-circuit fault on-line monitoring system based on SSTDR, including letter
It is single number to generate unit, signal processor, transmitting signal transmitting module, reflection signal receiving module, coupling isolation, data storage
Member, I/O unit, remote data transmission module and GIS geography information module, signal generation unit is for generating STDR/SSTDR
PN code and sinusoidal signal needed for detection, transmitting signal transmitting module are used to detect the amplification and conditioning of signal；Transmitting signal connects
The reflection signal that module is used to receive fault point is received, while transmitting Signal separator being come out；Coupling isolation will be for that will test signal
Keep apart with the high-voltage electricity in midium voltage cable；Data storage cell is for storing test number and parameter configuration data；Input/defeated
Unit includes key and display screen out, is used for human-computer interaction；Remote data transmission module is used for the result teletransmission of local test
To Cloud Server.
A kind of midium voltage cable open-circuit fault on-line monitoring method based on SSTDR, under STDR/SSTDR detection mode, first
Circuit state detection is carried out with the test signal of lower frequency, if detecting that cable sends open-circuit fault, system is gradually
Increase frequency, by the method for " successive ignition, by approach frequently ", decision circuitry send open circuit fault point distance it is local away from
From, then by with GIS geography information binding analysis, judge whether occur open-circuit fault, in case of open-circuit fault, into
One step calculates location of fault, distance.
The present invention proposes a kind of midium voltage cable open-circuit fault on-line monitoring system and method based on SSTDR, this to be based on
The method of SSTDR as detection signal, has excellent correlation properties and wider using the signal after PN code and sine wave modulation
Frequency spectrum, be not only able to achieve on-line checking, and positioning accuracy is high, strong antijamming capability is very suitable for the inspection of midium voltage cable failure
It surveys.
Detailed description of the invention
Fig. 1 is that the present invention proposes the cable open-circuit fault on-line monitoring system figure based on SSTDR.
Fig. 2 is the monitoring flow chart of the method for the present invention.
Specific embodiment
The present invention proposes a kind of midium voltage cable open-circuit fault on-line monitoring system and method based on SSTDR.
Fig. 1 is that the present invention proposes the cable open-circuit fault on-line monitoring system figure based on SSTDR.The system includes that signal produces
It is raw unit, signal processor, transmitting signal transmitting module, reflection signal receiving module, coupling isolation, data storage cell, defeated
Enter/output unit, remote data transmission module, GIS geography information module.
The functional block diagram of SSTDR is as shown in the figure.It is STDR mode when switch selection is connected to port A；When switch selection connects
It is SSTDR mode when to port B.It will test signal to be sent into cable under test, detection signal can occur instead at Method of Cable Trouble Point
It penetrates, while receiving reflection signal, will test signal and reflection signal carries out related operation.
S (t) is detection signal in formula, and x (t- τ) is reflection signal, and r (t) is correlation result, and T is detection signal week
Phase.The open circuit and distance (fault message) of cable fault can be extracted from correlation result (detection curve).
SSTDR is that detection signal does not influence the normal work of cable relative to a big advantage of other bounce techniques, thus
On-line checking can be realized to the cable of normal work.On-line checking it can be found that the failure occurred in cable operational process, this
There is particularly important meaning to the potential risk for excluding cable.
Signal processor is mainly the signal generation for controlling signal generation unit in Fig. 1, selects PN code or Sin (wt) respectively
The generation of signal；Emit the amplification and conditioning that signal transmitting module major function is signal；Emit the main function of signal receiving module
It can be to receive reflection signal, while transmitting Signal separator being come out；Coupling isolation will mainly be tested in signal and midium voltage cable
High-voltage electricity keep apart；Data storage cell major function is storage test number and parameter configuration data；I/O unit
Including the input/output modules such as key and display screen；Remote data transmission module major function is by the result teletransmission of local test
To Cloud Server.
The present invention proposes a kind of midium voltage cable open-circuit fault on-line monitoring system based on SSTDR and method first with compared with low frequency
The test signal of rate carries out circuit state detection, if detecting that cable sends open-circuit fault, system gradually increases frequency,
By the method for " successive ignition, by approach frequently ", accurate judgement circuit sends the distance of fault point distance this system of open circuit.So
Afterwards by with GIS geography information binding analysis, whether accurate judgement occurs open-circuit fault, in case of open-circuit fault, into
One step calculates location of fault, distance.
Present system can dispose multiple mesolows based on SSTDR on a plurality of midium voltage cable within the scope of substation
Cable open-circuit fault on-line monitoring system then will be multiple online in network by by data remote transmission to Cloud Server
System data is monitored, building is based on the thinking perspective view in " time and space ".
Midium voltage cable open-circuit fault on-line monitoring method proposed by the present invention based on SSTDR, detailed process such as Fig. 2 institute
Show.
After system electrification starts, function of initializing module is first carried out, subsequently into system self-calibration program, calibration is finished
Afterwards, then judge whether calibration reaches by test and meet index request.If if the requirements are not met, system reenters system
Then self calibration judges whether to meet index request again, be that system calibration is more acurrate by " circulation is calibrated ", so that test knot
Fruit is more acurrate.If meeting index request, that enters following program.
It first passes through and sends PN code using STDR signal detection cable status, then same Sin (wt) signal carries out SSTDR letter again
Number detection cable state.Judge whether that open-circuit fault occurs by result after being completed, if a failure occurs, carry out it is local and
Remote alarms；If it is determined that do not break down, then continue to judge whether test macro abnormal, if system work there is no
It is abnormal, then continue STDR and SSTDR signal detection.If system sends exception, system reenters system self-correcting
It is quasi-.And so on, loop test.
Claims (2)
1. a kind of midium voltage cable open-circuit fault on-line monitoring system based on SSTDR, it is characterized in that including signal generation unit, letter
Number processor, transmitting signal transmitting module, reflection signal receiving module, coupling isolation, data storage cell, input/output list
Member, remote data transmission module and GIS geography information module, PN code needed for signal generation unit is used to generate STDR/SSTDR detection
And sinusoidal signal, transmitting signal transmitting module are used to detect the amplification and conditioning of signal；Transmitting signal receiving module is for receiving
The reflection signal of fault point, while transmitting Signal separator being come out；Coupling isolation will be for that will test in signal and midium voltage cable
High-voltage electricity is kept apart；Data storage cell is for storing test number and parameter configuration data；I/O unit includes key
And display screen, it is used for human-computer interaction；Remote data transmission module is used for the result teletransmission of local test to Cloud Server.
2. a kind of midium voltage cable open-circuit fault on-line monitoring method based on SSTDR, it is characterized in that in the detection side STDR/SSTDR
Under formula, circuit state detection first is carried out with the test signal of lower frequency, if detecting that cable sends open-circuit fault, is
System gradually increases frequency, and by the method for " successive ignition, by approach frequently ", the fault point distance that decision circuitry sends open circuit is local
Distance, then by with GIS geography information binding analysis, judge whether occur open-circuit fault, in case of open-circuit fault
Words, further calculate location of fault, distance.
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| CN201910507814.7A CN110187236A (en) | 2019-06-12 | 2019-06-12 | A kind of midium voltage cable open-circuit fault on-line monitoring system and method based on SSTDR |
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Cited By (3)
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| CN110703127A (en) * | 2019-11-01 | 2020-01-17 | 中国人民解放军海军航空大学 | Airplane cable fault detection device and detection method thereof |
| CN112067945A (en) * | 2020-09-10 | 2020-12-11 | 广州赛力迪科技有限公司 | Railway signal cable on-line fault positioning system and method |
| CN112710740A (en) * | 2020-12-09 | 2021-04-27 | 东莞理工学院 | PN code-based time reversal multi-bolt damage ultrasonic detection method and system |
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Application publication date: 20190830 |