CN105974257A - Multi-bus loop fault positioning searching device and multi-bus loop fault positioning searching method for protection loop - Google Patents
Multi-bus loop fault positioning searching device and multi-bus loop fault positioning searching method for protection loop Download PDFInfo
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- CN105974257A CN105974257A CN201610419762.4A CN201610419762A CN105974257A CN 105974257 A CN105974257 A CN 105974257A CN 201610419762 A CN201610419762 A CN 201610419762A CN 105974257 A CN105974257 A CN 105974257A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/088—Aspects of digital computing
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- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The invention provides a multi-bus loop fault positioning searching device and a multi-bus loop fault positioning searching method for a protection loop. According to the multi-bus loop fault positioning searching device, real-time acquisition is performed on leakage current of all loops in the protection loop; signal processing is performed on data which are acquired by each loop; the data are uploaded to a fault analyzing module; multidimensional mode matching is performed on a characteristic rule which is arranged in a fault analyzing module system; system loop information is finally acquired; through loop analysis of the fault analyzing module, system loop distribution system information, loop state and insulation curve information of each loop are described; and particularly loops are displayed on a display screen. According to the multi-bus loop fault positioning searching device and the multi-bus loop fault positioning searching method, searching and positioning are performed on the loops which may occur in each feed line between multiple buses of the protection loop. Pairing can be performed between DC system loops of different buses. The multi-bus loop fault positioning searching device for the protection loop can perform accurate positioning and searching on the multi-bus loop fault of the protection loop.
Description
Technical field:
The present invention relates to special relay protection circuit loop fault and search field, be specifically related to the protective loop loop event of many buses
The Search and Orientation device of barrier.
Background technology:
At present, straight-flow system is mainly used in control loop, protective relaying device and outlet loop thereof in transformer station, signal returns
Road, widely, therefore the reliability of straight-flow system is extremely important in distribution.Electrical grid necessarily longtime running, along with season,
The change of the external environment conditions such as temperature and humidity, exposes metal in the environment, cable insulation material can produce damage and aging, adds
Connected equipment in running, self a certain degree of quality problems will occur, make some insulating properties the best element funeral
Lose insulation attribute, cause straight-flow system to be directly grounded.The concrete origin cause of formation of DC ground fault has: (1) cable, equipment, components and parts,
Secondary circuit insulant is defective, insulating properties are low because be chronically exposed to changeable in the environment of produce insulant serious
Aging, or exist some damage defect, creep such as insulant, butcher cuts, weigh wounded, DC system grounding that burn etc. causes；
(2) straight-flow system exposes aerial cable, equipment containing metal shell and the assembly local environment such as components and parts, secondary circuit
Containing conductive body or operate in moist rainy weather, using is not in good state makes electrical equipment insulation against ground performance significantly drop
Low, thus it is easily caused DC earthing.Happening under the special environment such as misty rain, plum rain season, straight-flow system easily causes occasionality
System earth, but may disappear when environment changes；(3) climbed into by wild animal when transformer station is in countryside or occasionality
Conductive component comes off on band point element, and this situation directly contributes DC system earth fault.According to existing reported in literature, as in suburb
Outward, the toy such as muroid, insecticide enters the loop of live line work often, thus causes the accident of ground short circuit to occur；It addition, because of
The metal parts long for substation equipment maintenance and repair construction or service life often falls when charged straight-flow system secondary performance loop, directly
Streaming system loop can connect with metal screen and ground short circuit occurs；Furthermore, secondary line insulation epidermis is easily subject to Rig up error
Rotatable parts scratch, thus cause the abrasion of insulating barrier to cause DC earthing the most exceptionally；(4) cable, equipment, unit's device
Part, secondary circuit etc., owing to constructing, safeguarding unreasonable or mistake, can produce the most ND earth fault hidden, often
See that situation has: secondary connection loosens, comes off, impacts such as being given a shock because of equipment and artificially touch by mistake, touch metal shell, cause straight
Stream earth fault, in the loosening case of secondary connection, then cable core on terminal, now terminal is in running status, and
Cable other end causes ground connection, and its concrete reason usually cable other end is erroneously interpreted as standby core or not charged, from
And make it exposed on ironware；Between direct current charging equipment and grounding apparatus or AC and DC charging equipment, insulation clearance is owing to setting
That counts and install is the least, when overvoltage occur in charging equipment or DC loop, it is possible to by gap breakdown, forms direct current and connects
Ground.
Power plant, transformer station direct current system ground connection are a kind of common and bigger to power system harm faults.General feelings
Under condition, one point earth has no effect on the operation of straight-flow system, if but can not quickly finding earth fault and be repaired, again
There is another one-point grounding fault, it is possible to cause signal circuit, the misoperation of the control device such as loop, relay protection, thus broken
The safe operation of bad power system, even causes large-scale power outage.Therefore, when straight-flow system generation one-point grounding fault
Shi Bixu finds early and gets rid of.
At present monitoring in real time for DC system grounding, this monitoring are only resided within for straight-flow system insulation analysis
Mainly there is a following two principle: active and passive type two kinds.The most active monitoring: inject the direct current of band characteristic information to system
Micro-current signal, then detects this signal by sensor and sentences loop and the feeder line involved by loop ground connection.2. passive type prison
Survey: do not inject any signal to system, utilize high sensitivity and high-resolution direct current transducer, directly detect the electric leakage in each loop
Stream judges loop and loop ground connection.Due to complexity and the dynamic of straight-flow system insulation against ground, DC ground fault is often
It is difficult to position.And for there is the straight-flow system of loop, its earth fault to be accurately positioned its difficulty bigger, straight-flow system is connect
Accuracy and the safety of ground monitoring device are had higher requirement.Passive type monitoring does not send any signal specific as sentencing
Disconnected benchmark, and containing various interference signals in straight-flow system, therefore monitoring difficulty is much larger than active.But passive type monitoring
With its safety, represent the developing direction of straight-flow system monitoring device, along with the continuous progress of modern microelectronic technology, will become
Main flow for market.
At present monitoring in real time for DC system grounding, this monitoring are only resided within for straight-flow system insulation analysis
Mainly there is a following two principle: active and passive type two kinds.The most active monitoring: inject the direct current of band characteristic information to system
Micro-current signal, then detects this signal by sensor and sentences loop and the feeder line involved by loop ground connection.2. passive type prison
Survey: do not inject any signal to system, utilize high sensitivity and high-resolution direct current transducer, directly detect the electric leakage in each loop
Stream judges loop and loop ground connection.Due to complexity and the dynamic of straight-flow system insulation against ground, DC ground fault is often
It is difficult to position.And for there is the straight-flow system of loop, its earth fault to be accurately positioned its difficulty bigger, straight-flow system is connect
Accuracy and the safety of ground monitoring device are had higher requirement.Passive type monitoring does not send any signal specific as sentencing
Disconnected benchmark, and containing various interference signals in straight-flow system, therefore monitoring difficulty is much larger than active.But passive type monitoring
With its safety, represent the developing direction of straight-flow system monitoring device, along with the continuous progress of modern microelectronic technology, will become
Main flow for market.
For the solution of direct-current system loop fault, current existing technology can carry out ring in same section of straight-flow system
Road is matched.But for the loop between multistage bus, it is impossible to effectively match, the particularly lookup of circling point, also lack effectively
Lookup tool or instrument.
Transforming plant protecting circuit connection is complicated at present, especially when 220kV Transfomer Substation Reconstruction protective loop, all uses double back
Road is from different dc bus power taking sources, and owing to each protective loop is numerous, complicated, this is possible to cause loop fault.Protect back
When road occurs loop fault, protective loop can be caused to report ground connection by mistake, relay fail, malfunction even occur, lose protection power supply
Accident.The eliminating of loop fault, makes straight-flow system really become radiant type feeder system, reaches to protect systematic design discipline to be retouched
The standard stated.During protective loop generation loop fault, can cause direct current wrong report ground connection thus give earth fault location bring
Interference greatly.
Patent documentation CN 202710684 U discloses a kind of can the transforming plant DC power supply of charged lookup fault online
Loop warning system, the fault being arranged on transformer station direct current system loop by multiple distributions is popped one's head in, and direct-current system loop
Multiple transmitting substations that upper distribution is arranged, launch the fault probe wireless connections that substation is neighbouring with it, and will by GSM network
Fault-signal transmission receives base station to GSM；Fault detected in straight-flow system can be shown in Surveillance center, can be to whole
Individual straight-flow system effectively monitors, and can quickly know the generation position of fault when breaking down, and improves and releases fault
Efficiency, reduces the economic loss and social loss caused because of fault.But this method needs arrange many on each loop
Individual fault probe and transmitting substation, improve the early stage laying cost of straight-flow system, and operability is low, and using value is relatively low.
Chinese invention patent description CN 103728527 A discloses a kind of protective loop many bus section, busbar sections loop fault prison
Examining system, including signals collecting and pretreatment module SCM, Digital Signal Analysis and Processing module SAM and loop fault alarm module
LWM, SCM module gathers the leakage current of bus, and the data that two sections of bus collections are returned by Digital Signal Analysis and Processing module SAM are carried out
FIR digital signal pretreatment, filters and extracts small echo time-domain spectral after noise, and the multiple loop model built-in with equipment is carried out
Join, thus judge that system is in normal condition or abnormality；Then all Monitoring Data are carried out real-time storage, pass through
The loop analysis software of LWM, depicts the insulation calibration curve information in system circuit compartment system information, loop circuit state, every loop.
This system, mainly by gathering the leakage current of bus section, busbar section, analyzes and processes laggard row mode coupling and determines the loop broken down,
Collection data are less, and loop mode matching process is accurate not, and the determination causing loop fault is the most not accurate enough.
Loop fault, in the system that presentation is properly functioning, tends not to cause that operating maintenance personnel's is the heaviest
Depending on, long-term existence, in protection system, affects the safe operation of system.The monitoring of loop fault exists on technical research and application
Bigger technological difficulties, seldom have corresponding problem to its research of discussing.Therefore, for protective loop multistage
Between bus, the loop that each feeder line is likely to occur, need one can make a look up location, can be at protective loop many bus section, busbar sections ring
Road fault location searches device.
Summary of the invention:
The technical problem to be solved be for protective loop multistage bus between, the loop that each feeder line is likely to occur, enter
Row Search and Orientation, can be at protective loop many bus section, busbar sections loop fault positioning searching device.
Therefore, the present invention fully collects transformer dc system for field data, catches loop curent change rule and trend,
Set up the mathematical model of substantial amounts of loop fault and analyze the information characteristics of loop fault, recycling various algorithm and carry out pattern
Join, finally draw reliable loop unpaired message.
Protective loop many bus section, busbar sections loop fault positioning searching device that the present invention proposes, this device utilizes high-precision sensing
Device to all loops ripple waveform, leakage current and resistance to earth value Real-time Collection in protective loop, every loop is gathered and
The data obtained use large scale integrated circuit to carry out digital signal pretreatment, extract waveform and resistance to earth value after filtering interfering,
Information is uploaded to failure analysis module in real time by data/address bus, and failure analysis module utilizes the solidification that its internal single-chip microcomputer is built-in
Signature waveform and predetermined resistance to earth value contrast, and real-time storage information, depict protective loop compartment system information, ring
Line state, the insulation calibration curve information in every loop, the loop branch road information that the system that finally draws is concrete, pass through failure analysis module
Data processing module, comprehensive all loops information and comparison data, draw system branch compartment system information, loop waveform shape
State, ripple and resistance to earth value, then demonstrate the concrete feeder number of loop, loop waveform, ripple and resistance to earth on a display screen
Value.
Specific embodiments of the present invention are: a kind of protective loop many bus section, busbar sections loop fault positioning searching device, including:
Signal acquisition module, signal processing module, failure analysis module and display unit, it is achieved to all loops ripple waveform, electric leakage
Stream and resistance to earth value Real-time Collection, signal acquisition module is by the leakage current of Real-time Collection, shape information and resistance information transmission
To signal processing module, signal processing module to waveform and over the ground resistance value ratio to analysis；The signal processing module leakage to collecting
Current processing obtains Wavelet time-frequency signal, the Wavelet time-frequency signal data obtained is sent to loop fault and analyzes module, fault
Analyzing inside modules storage has substantial amounts of ring same with transforming plant protecting system, the mathematical model of different ring and characteristic, loop to connect
Ground mathematical model and characteristic, after failure analysis module receives Wavelet time-frequency signal data, use built-in loop mould
Type and characterization rules constantly carry out multi-dimensional model coupling, carry out loop screening, determine the pairing same characteristic features of loop reach 80% with
On feeder line address, export storage and display terminal as the monitoring result of loop fault.And record other ring less than 80%
The feeder line address of road feature, as loop storage of history data P；Failure analysis module depict protective loop compartment system information,
Loop circuit state, the insulation calibration curve information in every loop, analyze and draw the loop branch road information that system is concrete, by accident analysis mould
The data processing module of block, comprehensive all loops information and comparison data, draw system branch compartment system information, loop waveform
State, ripple and resistance to earth value；Result is sent to display unit by failure analysis module, is shown by display unit and analyzes
The concrete feeder number of loop, loop waveform and the resistance to earth value gone out.
Further, signal acquisition module includes waveform acquisition module, leakage current acquisition module and electrical resistance collection module；
Further, signal amplification module, filtration module and D/A converter module are included inside signal processing module；
Further, signal processing module flows through signal amplification module to the electric leakage collected and carries out signal amplification；
Further, signal amplification module includes differential operational amplifier；
Further, filtration module filters the noise signals such as spike, and wherein filtration module includes capacitor；
Further, D/A converter module converts analog signals into digital information, and wherein D/A converter module includes high-speed a/d
Transducer；
Further, high-speed a/d converter selects the ads7805 chip of 16.
The present invention also proposed a kind of protective loop many bus section, busbar sections loop fault positioning searching method, including, 1) collect
Transformer dc system for field data, catch loop curent change rule and trend, set up the mathematical modulo of substantial amounts of loop fault
Type and the information characteristics of analysis loop fault；2) the ripple waveform in all loops of transformer dc system, leakage current and right are gathered
Earth resistance value；3) by signal processing module, shape information and the resistance information of collection are compared, leakage current is believed
Number process obtains Wavelet time-frequency signal；4) failure analysis module storage inside has substantial amounts of ring same with transforming plant protecting system, different
The mathematical model of ring and characteristic, loop ground connection mathematical model and characteristic, failure analysis module uses built-in loop
Model and characterization rules constantly carry out multi-dimensional model coupling to Wavelet time-frequency signal data, carry out loop screening, determine loop
Pairing same characteristic features reaches the feeder line address of more than 80%, and the monitoring result as loop fault exports storage and display terminal；
5) and record other feeder line address of loop characteristics less than 80%, as loop storage of history data P；6) failure analysis module is retouched
Draw the insulation calibration curve information in protective loop compartment system information, loop circuit state, every loop, analyze and draw the ring that system is concrete
Road branch road information, by the data processing module of failure analysis module, comprehensive all loops information and comparison data, draw system
Branch road compartment system information, loop waveform state, ripple and resistance to earth value, then demonstrate the concrete loop of loop on a display screen
Number, loop waveform, ripple and resistance to earth value.
The invention have the benefit that
1, location trouble shoot device may determine that the pairing feeder line address of loop, reaches the composition loop feedback of loop fault monitoring
Being accurately positioned of line, finds in time the loop fault point in protective loop, processes loop fault in time, be prevented effectively from because of loop therefore
The false protection of barrier generation or tripping；
2, the present invention fully collects field data, catches loop curent change rule and trend, sets up substantial amounts of loop fault
Mathematical model and the information characteristics of analysis loop fault, recycle various algorithm and carry out pattern match, finally draw reliable ring
Road unpaired message；
3, high-speed a/d converter selects the ads7805 chip of 16, and chip internal contains sampling holding, voltage reference and clock
In circuit, greatly simplify the circuit design of user, improve the stability of system simultaneously；
4, display unit uses liquid crystal display, energy-saving and environmental protection, radiates low, and effective area is big, and image quality fine shows, weight
Gently, installation and the use of positioning searching device are facilitated.
Accompanying drawing explanation。
Fig. 1 is the structural representation of positioning searching device of the present invention.
Fig. 2 is the schematic diagram of positioning searching device of the present invention work.
Detailed description of the invention:
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
The present invention proposes a kind of protective loop many bus section, busbar sections loop fault positioning searching device, is illustrated in figure 1 this
The structural representation of bright positioning searching device, this positioning searching device includes that signal acquisition module, signal processing module, fault are divided
Analysis module and display unit.Signal acquisition module includes waveform acquisition module, leakage current acquisition module and electrical resistance collection module, real
Now to all loops ripple waveform, leakage current and resistance to earth value Real-time Collection, signal acquisition module is by the electric leakage of Real-time Collection
Stream, shape information and resistance information send signal processing module to.Signal amplification module, filtering is included inside signal processing module
Module and D/A converter module, signal processing module to waveform and over the ground resistance value ratio to analysis；Signal processing module is to collecting
Electric leakage flow through signal amplification module and carry out signal amplification, signal amplification module includes differential operational amplifier；Filtered
Module filters the noise signals such as spike, and wherein filtration module includes capacitor；Again through D/A converter module, analogue signal is turned
Changing digital information into, wherein D/A converter module includes high-speed a/d converter, and high-speed a/d converter selects the ads7805 of 16
Chip, chip internal contains the circuit such as sampling holding, voltage reference and clock, greatly simplifies the circuit design of user, carry simultaneously
The high stability of system, ads7805 uses cmos technique to manufacture, low in energy consumption, and single channel inputs, the scope of analog input voltage
For ± 10v, using successive approximation operation principle, transformation result, by 16 position datawire parallel outputs, starts in conversion and reading
The result of secondary conversion can be carried out simultaneously.After digital-to-analogue conversion, signal processing is extracted Wavelet time-frequency signal.
Afterwards the Wavelet time-frequency signal data obtained is sent to loop fault and analyzes module.Change is collected in a large number by early stage
Depressor straight-flow system field data, catches loop curent change rule and trend, establishes the mathematical modulo of substantial amounts of loop fault
Type, inside these loop fault mode inputs to failure analysis module, failure analysis module storage inside has substantial amounts of and becomes
The same ring of plant protection system, the mathematical model of different ring and characteristic, loop ground connection mathematical model and characteristic.Accident analysis
After module receives Wavelet time-frequency signal data, built-in loop model and characterization rules is used constantly to carry out multi-dimensional model
Join, and give full play to the data acquisition advantage of on-line monitoring, carry out synchronous acquisition, simultaneously match, in substantial amounts of matched data,
Define by loop characteristics, select the feeder line branch road address that there may be loop, by probability statistics principle, carry out loop screening,
Finally determine loop pairing same characteristic features reach more than 80% feeder line address, the monitoring result as loop fault exports
Storage and display terminal.And record other feeder line address of loop characteristics less than 80%, as loop storage of history data P.This
What the positioning searching device of invention completed loop fault feeder line address is accurately positioned monitoring, finds the ring in protective loop in time
Trouble point, road, processes loop fault in time, is prevented effectively from the false protection or tripping occurred because of loop fault.Choose joining of loop
Same characteristic features is reached more than 80%, both ensure that the precision of coupling, the workload of matching primitives can have been controlled again, make amount of calculation
It is unlikely to excessive.
By the Wavelet time-frequency signal data in every loop is carried out data analysis, depict protective loop compartment system letter
Breath, loop circuit state, the insulation calibration curve information in every loop, the loop branch road information that the system that finally draws is concrete, divided by fault
The data of analysis module process CPU, comprehensive all loops information and comparison data, draw system branch compartment system information, loop
Waveform state, ripple and resistance to earth value, after obtaining result, result is sent to display unit by failure analysis module, passes through
The concrete feeder number of loop, loop waveform, ripple and the resistance to earth value drawn is analyzed in display unit display.Display unit uses liquid
Crystal display, energy-saving and environmental protection, radiate low, effective area is big, and image quality fine shows, lightweight, facilitates positioning searching device
Install and use.
As in figure 2 it is shown, be the schematic diagram of positioning searching device of the present invention work.
The invention allows for a kind of protective loop many bus section, busbar sections loop fault positioning searching method, including, 1) collect change
Depressor straight-flow system field data, catches loop curent change rule and trend, sets up the mathematical model of substantial amounts of loop fault
With the information characteristics analyzing loop fault；2) the ripple waveform in all loops of transformer dc system, leakage current and over the ground are gathered
Resistance value；3) by signal processing module, shape information and the resistance information of collection are compared, to leakage current signal
Process obtains Wavelet time-frequency signal；4) failure analysis module storage inside has substantial amounts of and the same ring of transforming plant protecting system, different ring
Mathematical model and characteristic, loop ground connection mathematical model and characteristic, failure analysis module uses built-in loop mould
Type and characterization rules constantly carry out multi-dimensional model coupling to Wavelet time-frequency signal data, carry out loop screening, determine joining of loop
Same characteristic features reaches the feeder line address of more than 80%, and the monitoring result as loop fault exports storage and display terminal；5)
And record other feeder line address of loop characteristics less than 80%, as loop storage of history data P；6) failure analysis module is described
Go out the insulation calibration curve information in protective loop compartment system information, loop circuit state, every loop, analyze and draw the loop that system is concrete
Branch road information, by the data processing module of failure analysis module, comprehensive all loops information and comparison data, the system of drawing is propped up
Road compartment system information, loop waveform state, ripple and resistance to earth value, then demonstrate the concrete loop of loop on a display screen
Number, loop waveform, ripple and resistance to earth value.
The location trouble shoot device that the present invention provides may determine that the pairing feeder line address of loop, reaches loop fault prison
That surveys constitutes being accurately positioned of loop feeder, finds the loop fault point in protective loop in time, processes loop fault in time, have
Effect avoids false protection or the tripping occurred because of loop fault.
Claims (9)
1. protective loop many bus section, busbar sections loop fault positioning searching device, it is characterised in that including: signal acquisition module,
Signal processing module, failure analysis module and display unit, it is achieved to all loops ripple waveform, leakage current and resistance to earth value
Real-time Collection, signal acquisition module sends the leakage current of Real-time Collection, shape information and resistance information to signal processing module,
Signal processing module to waveform and over the ground resistance value ratio to analysis；The signal processing module leakage current to collecting processes and obtains small echo
Time frequency signal, the Wavelet time-frequency signal obtained is sent to loop fault analyze module, failure analysis module storage inside have with
The same ring of transforming plant protecting system, the mathematical model of different ring and characteristic, loop ground connection mathematical model and characteristic, fault is divided
After analysis module receives Wavelet time-frequency signal, carry out multi-dimensional model coupling and loop screens, determine the identical spy of pairing of loop
Levying the feeder line address reaching more than 80%, the monitoring result as loop fault exports storage and display terminal；And record other
The feeder line address of the loop characteristics less than 80%, as loop storage of history data P；Failure analysis module is depicted protective loop and is divided
Distribution system information, loop circuit state, the insulation calibration curve information in every loop, analyze and draw the loop branch road information that system is concrete, logical
Cross the data processing module of failure analysis module, comprehensive all loops information and comparison data, draw system branch compartment system
Information, loop waveform state, ripple and resistance to earth value；Result is sent to display unit by failure analysis module, by display
The concrete feeder number of loop, loop waveform and the resistance to earth value drawn is analyzed in unit display.
2. positioning searching device as claimed in claim 1, it is characterised in that described signal acquisition module includes waveform acquisition mould
Block, leakage current acquisition module and electrical resistance collection module.
3. positioning searching device as claimed in claim 1, it is characterised in that include that signal is put inside described signal processing module
Big module, filtration module and D/A converter module.
4. positioning searching device as claimed in claim 1, it is characterised in that the described signal processing module electric leakage to collecting
Flow through signal amplification module and carry out signal amplification.
5. positioning searching device as claimed in claim 3, it is characterised in that described signal amplification module includes that calculus of differences is put
Big device.
6. positioning searching device as claimed in claim 3, it is characterised in that described filtration module filters spike and noise letter
Number, wherein filtration module includes capacitor.
7. positioning searching device as claimed in claim 3, it is characterised in that analogue signal is changed by described D/A converter module
Becoming digital information, wherein said D/A converter module includes high-speed a/d converter.
8. positioning searching device as claimed in claim 7, it is characterised in that described high-speed a/d converter selects 16
Ads7805 chip.
9. protective loop many bus section, busbar sections loop fault positioning searching method, it is characterised in that include, 1) collect transformator straight
Streaming system field data, catches loop curent change rule and trend, sets up mathematical model and the analysis of substantial amounts of loop fault
The information characteristics of loop fault；2) the ripple waveform of transformer dc system circuit, leakage current and resistance to earth value are gathered；3) logical
Cross the signal processing module shape information to gathering and resistance information compares, leakage current signal processing is obtained small echo
Time frequency signal；4) failure analysis module storage inside have substantial amounts of with the same ring of transforming plant protecting system, the mathematical model of different ring and
Characteristic, loop ground connection mathematical model and characteristic, failure analysis module carries out multi-dimensional model coupling and loop screens, really
The pairing same characteristic features determining loop reaches the feeder line address of more than 80%, as the monitoring result of loop fault export storage and
Display terminal；5) and record other feeder line address of loop characteristics less than 80%, as loop storage of history data P；6) fault
Analyzing module plotting and go out the insulation calibration curve information in protective loop compartment system information, loop circuit state, every loop, analysis draws and is
The loop branch road information uniting concrete, by the data processing module of failure analysis module, comprehensive all loops information and compare logarithm
According to, draw system branch compartment system information, loop waveform state, ripple and resistance to earth value, then demonstrate on a display screen
The concrete feeder number of loop, loop waveform, ripple and resistance to earth value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421782A (en) * | 2020-11-20 | 2021-02-26 | 云南电网有限责任公司临沧供电局 | Leakage protection switch on-line monitoring device |
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