CN109324263A - A kind of distribution network cable initial failure positioning system and its control method based on transient disturbance - Google Patents
A kind of distribution network cable initial failure positioning system and its control method based on transient disturbance Download PDFInfo
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- CN109324263A CN109324263A CN201811239674.1A CN201811239674A CN109324263A CN 109324263 A CN109324263 A CN 109324263A CN 201811239674 A CN201811239674 A CN 201811239674A CN 109324263 A CN109324263 A CN 109324263A
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- 230000001052 transient effect Effects 0.000 title claims abstract description 93
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- 238000005259 measurement Methods 0.000 claims description 34
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- 230000005611 electricity Effects 0.000 claims description 4
- 238000013528 artificial neural network Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010835 comparative analysis Methods 0.000 claims description 3
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- 238000012706 support-vector machine Methods 0.000 claims description 3
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- 230000004888 barrier function Effects 0.000 claims description 2
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Classifications
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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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- 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
Abstract
The invention discloses a kind of distribution network cable initial failure positioning system and its control method based on transient disturbance, the system comprises information transmission modular, Transient Disturbance Signal detection module, Transient Disturbance Signal identification module, fault pre-alarming module, fault data processing module and cable fault locating modules.The system is efficient one kind, low cost, the cable initial failure early warning of high reliability and localization method, it can simplify and promoted maintenance work efficiency, effective prevention cable fault, finds the initial failure of cable in time, avoids loss of outage caused by cable fault.
Description
Technical field
The invention belongs to technical field of electric power, are related to a kind of distribution network cable initial failure positioning system based on transient disturbance
System and its control method.
Background technique
Power distribution network is located at the end of electric system, is directly connected with user, power supply capacity of the entire electric system to user
It is all realized and is ensured by it with power supply quality.Therefore, power distribution network is both the development foundation of entire electric system and it is final
Home to return to is the important link for realizing smart grid.Meanwhile with the gradually expansion of city size, the load density of power distribution network is not
Disconnected to increase, the requirement to indexs such as its power supply reliability and power supply qualitys is higher and higher.But currently, mutual during the big load of power grid
For scarce capacity, it is most likely that the power outage of occurrence of large-area, power supply reliability and the ability withstood natural calamities are urgently
It improves.
With the quickening of urbanization process, cable deal shared in the net power supply of city is also increasingly heavier, gradually replaces
Aerial power supply line, is widely used in power distribution network.Buried cable is more safer than overhead line in inclement weather, and short distance passes
It is defeated more economical, and have the characteristics that be not easy affected by environment and easy to maintain, therefore it is widely applied.Power cable is main
For the power lead-in of substation, power plant and industrial and mining enterprises, use scope is gradually extensively to be taken seriously.With city
The development of construction, overhead transmission line is gradually replaced power cable, and shared ratio is increasing in the net power supply of city.With
Being widely used for power cable necessarily bring increasing for cable fault, buried cable is easier to draw because of shelf depreciation, flashover etc.
Hair causes permanent fault, and trouble shoot is more difficult, is the highest equipment of failure rate in Distribution Network Equipment.In order to ensure power cable
It safely and steadily runs, cable initial failure is accomplished to find to cope in time early.
Summary of the invention
To solve the above problems, a kind of distribution network cable initial failure positioning system and its control based on transient disturbance of the present invention
Method processed, the system are efficient one kind, low cost, the cable initial failure early warning of high reliability and localization method, Ke Yijian
Change and promoted maintenance work efficiency, effectively prevents cable fault.Therefore, it is necessary to study midium voltage cable deterioration process, in foundation
The standard parameter of distribution network cable degradation is pressed, proposes the monitoring means and discrimination method of cable initial failure, realizes failure classes
Type identification and Severity, find the initial failure of cable in time, avoid loss of outage caused by cable fault.
The present invention is specially a kind of distribution network cable initial failure positioning system based on transient disturbance, and the system comprises letters
Cease transmission module, Transient Disturbance Signal detection module, Transient Disturbance Signal identification module, fault pre-alarming module, at fault data
Manage module and cable fault locating module；The information of measurement point is transferred to the Transient Disturbance Signal by the information transmission modular
Detection module and the fault data processing module；The Transient Disturbance Signal detection module is connected to the Transient Disturbance Signal
Identification module, the Transient Disturbance Signal identification module identify the Transient Disturbance Signal detected, and tentatively judgement hair
A possibility that raw failure；The Transient Disturbance Signal identification module is connected to the fault pre-alarming module, the fault pre-alarming mould
Block is issued warning signal when the Transient Disturbance Signal identification module identifies that the possibility that breaks down is excessively high；The transient state is disturbed
Dynamic signal identification module is also connected to the fault data processing module, and the fault data processing module is doubtful to what is identified
Fault message is further judged and is handled；The fault data processing module is connected to the cable fault locating module,
The cable fault that the cable fault locating module judges the fault data processing module positions, with quick obtaining
The specific location of Method of Cable Trouble Point.
Further, the Transient Disturbance Signal detection module and Transient Disturbance Signal identification module are based on expert system
Interference signal statistical model identification operation, effective fault-signal is acquired.
Further, the information transmission modular can carry out between modules the collected fault-signal of measurement point
Signal conversion and data transmitting.
Further, the Transient Disturbance Signal detection module is able to detect the ground connection line current of cable, residual voltage, zero
The electric characteristic amount of the reflection cable electrical characteristic such as sequence electric current.
Further, the Transient Disturbance Signal identification module can be using neural network, support vector machine etc. to signal
Carry out the identification of multiclass disturbance.
Further, the fault data processing module and cable fault locating module are to the electricity based on Transient Disturbance Signal
Cable initial failure is judged and is positioned.
The control method for the distribution network cable initial failure positioning system based on transient disturbance that the invention also includes a kind of, it is special
Sign is that the control method includes the following steps:
Step 1: transient voltage, current signal mutual inductor for installation are combined using modeling analysis and experimental test
Method transient state travelling wave signal Transfer characteristic that initial failure is generated carry out the theory analysis of system；
Step 2: according to the basic principle of transient voltage, current signal mutual inductor, its Type Equivalent Circuit Model is established, to failure
Transient state travelling wave carries out progress of disease test, obtains mutual inductor according to test and joins to the progress of disease gain of signal, response delay, wave distortion etc.
Number；
Step 3: the transient state travelling wave signal of first and second side being handled, comparative analysis discloses transient state travelling wave and passes through mutual inductance
Secondary side signal changed essence when device, to the processing of secondary side fault-signal, the transient state travelling wave of identification initial failure generation
The information that Mintrop wave head signal contains；
Step 4: after determining that distribution is broken down, each measurement point current traveling wave Mintrop wave head height frequency component ωiPolarity η
The otherness being distributed with ENERGY E in faulty line section and non-fault line section constructs the identification of faulty line section accordingly and refers to
Show factor ξfIt is shown below:
Wherein, ξfIndicator, η are recognized for the fault section that each current traveling wave measurement point detectsiAnd γiIt is corresponding
Weight, influence of the value according to physical fault situation and mutual inductor to traveling wave propagation characteristic and predefine；Select first 3
Maximum fault section recognizes the section where being faulty line that the corresponding measurement point of factor values is surrounded；
Step 5: the initial failure transient signal measured using all measurement points on fault section route considers that it is propagated most
Short path and sign mutation point correspond to the moment, rationally determine the high fdrequency component institute that signal calculates data window length and to be extracted
In spectral range, the amplitude and phase information of each measuring point transient state travelling wave signal Mintrop wave head height frequency component are extracted using S-transformation；It is any
Frequency is ω in the traveling wave Mintrop wave head that measurement point A is detectediHigh-frequency signal be expressed from the next:
Wherein,And θAi=-βiX is that the traveling wave Mintrop wave head signal intermediate frequency rate that measurement point A is obtained is ωi's
The amplitude and phase of high-frequency signal；
Step 6: illusory bus method is used, when considering that a certain position of route is broken down between different measurement points, according to upper
Between the same high fdrequency component Amplitude Ration of the reality that the formula theoretically high fdrequency component Amplitude Ration being calculated and S-transformation are calculated
Difference solves the corresponding hypothesis position of minimum difference using the thought of iterative search, then the corresponding practical true event in this position
Hinder exact position；
Step 7: in view of the result solved using single amplitude information may have pseudo- root, therefore it is corresponding calculating
The notional phase difference and actual phase difference that corresponding measurement point same high fdrequency component is calculated while measurement point Amplitude Ration, using same
Mode solve failure exact position, then take two ways to calculate the intersection of result, be enough to ensure that in this way in various situations
Failure is accurately positioned result and is free of pseudo- root.
Detailed description of the invention
Fig. 1 is to invent a kind of distribution network cable initial failure positioning system structure schematic diagram based on transient disturbance；
Fig. 2 is distribution typical topology schematic diagram.
Specific embodiment
With reference to the accompanying drawing to inventing a kind of distribution network cable initial failure positioning system and its control based on transient disturbance
Method specific example elaborates.
As shown in Figure 1, including information transmission mould the present invention is based on the distribution network cable initial failure positioning system of transient disturbance
Block, Transient Disturbance Signal detection module, Transient Disturbance Signal identification module, fault pre-alarming module, fault data processing module and
Cable fault locating module；The information of measurement point is transferred to the Transient Disturbance Signal detection module by the information transmission modular
With the fault data processing module；The Transient Disturbance Signal detection module is connected to the Transient Disturbance Signal identification mould
Block, the Transient Disturbance Signal identification module identify the Transient Disturbance Signal detected, and tentatively judgement is broken down
A possibility that；The Transient Disturbance Signal identification module is connected to the fault pre-alarming module, and the fault pre-alarming module is in institute
It states Transient Disturbance Signal identification module and identifies and issued warning signal when the possibility that breaks down is excessively high；The Transient Disturbance Signal
Identification module is also connected to the fault data processing module, and the fault data processing module believes the suspected malfunctions identified
Breath is further judged and is handled；The fault data processing module is connected to the cable fault locating module, the electricity
The cable fault that cable fault location module judges the fault data processing module positions, with the event of quick obtaining cable
Hinder the specific location of point.
The Transient Disturbance Signal detection module and Transient Disturbance Signal identification module are that the interference based on expert system is believed
Number statistical model identification operation, effective fault-signal is acquired.
The collected fault-signal of measurement point can be carried out between modules signal conversion by the information transmission modular
And data transmitting.
The Transient Disturbance Signal detection module is able to detect the ground connection line current of cable, residual voltage, zero-sequence current etc.
Reflect the electric characteristic amount of cable electrical characteristic.
The Transient Disturbance Signal identification module can carry out multiclass to signal using neural network, support vector machine etc. and disturb
Dynamic identification.
The fault data processing module and cable fault locating module are to the cable early stage event based on Transient Disturbance Signal
Barrier is judged and is positioned.
As shown in Fig. 2, by typical power distribution network topological structure according to a kind of distribution network cable early stage based on transient disturbance
Being further elaborated for fault location system and its control method, is equipped with fault transient in power distribution network topological structure in the figure
Point occurs for signal measurement unit (mutual inductor) and cable initial failure.
Step 1: transient voltage, current signal mutual inductor for installation are combined using modeling analysis and experimental test
Method transient state travelling wave signal Transfer characteristic that initial failure is generated carry out the theory analysis of system；
Step 2: according to the basic principle of transient voltage, current signal mutual inductor, its Type Equivalent Circuit Model is established, to failure
Transient state travelling wave carries out progress of disease test, obtains mutual inductor according to test and joins to the progress of disease gain of signal, response delay, wave distortion etc.
Number；
Step 3: the transient state travelling wave signal of first and second side being handled, comparative analysis discloses transient state travelling wave and passes through mutual inductance
Secondary side signal changed essence when device, to the processing of secondary side fault-signal, the transient state travelling wave of identification initial failure generation
The information that Mintrop wave head signal contains；
Step 4: after determining that distribution is broken down, each measurement point current traveling wave Mintrop wave head height frequency component ωiPolarity η
The otherness being distributed with ENERGY E in faulty line section and non-fault line section constructs the identification of faulty line section accordingly and refers to
Show factor ξfIt is shown below:
Wherein, ξfIndicator, η are recognized for the fault section that each current traveling wave measurement point detectsiAnd γiIt is corresponding
Weight, influence of the value according to physical fault situation and mutual inductor to traveling wave propagation characteristic and predefine；Select first 3
Maximum fault section recognizes the section where being faulty line that the corresponding measurement point of factor values is surrounded；
Step 5: the initial failure transient signal measured using all measurement points on fault section route considers that it is propagated most
Short path and sign mutation point correspond to the moment, rationally determine the high fdrequency component institute that signal calculates data window length and to be extracted
In spectral range, the amplitude and phase information of each measuring point transient state travelling wave signal Mintrop wave head height frequency component are extracted using S-transformation；It is any
Frequency is ω in the traveling wave Mintrop wave head that measurement point A is detectediHigh-frequency signal be expressed from the next:
Wherein,And θAi=-βiX is that the traveling wave Mintrop wave head signal intermediate frequency rate that measurement point A is obtained is ωi's
The amplitude and phase of high-frequency signal；
Step 6: illusory bus method is used, when considering that a certain position of route is broken down between different measurement points, according to upper
Between the same high fdrequency component Amplitude Ration of the reality that the formula theoretically high fdrequency component Amplitude Ration being calculated and S-transformation are calculated
Difference solves the corresponding hypothesis position of minimum difference using the thought of iterative search, then the corresponding practical true event in this position
Hinder exact position；
Step 7: in view of the result solved using single amplitude information may have pseudo- root, therefore it is corresponding calculating
The notional phase difference and actual phase difference that corresponding measurement point same high fdrequency component is calculated while measurement point Amplitude Ration, using same
Mode solve failure exact position, then take two ways to calculate the intersection of result, be enough to ensure that in this way in various situations
Failure is accurately positioned result and is free of pseudo- root.
Finally it should be noted that only illustrating technical solution of the present invention rather than its limitations in conjunction with above-described embodiment.Institute
The those of ordinary skill in category field is it is to be understood that those skilled in the art can repair a specific embodiment of the invention
Change or equivalent replacement, but these modifications or change are being applied among pending claims.
Claims (7)
1. a kind of distribution network cable initial failure positioning system based on transient disturbance, which is characterized in that the system comprises information
Transmission module, Transient Disturbance Signal detection module, Transient Disturbance Signal identification module, fault pre-alarming module, fault data processing
Module and cable fault locating module；The information of measurement point is transferred to the Transient Disturbance Signal and examined by the information transmission modular
Survey module and the fault data processing module；The Transient Disturbance Signal detection module, which is connected to the Transient Disturbance Signal, to be known
Other module, the Transient Disturbance Signal identification module identify the Transient Disturbance Signal detected, and tentatively judgement occurs
A possibility that failure；The Transient Disturbance Signal identification module is connected to the fault pre-alarming module, the fault pre-alarming module
It is issued warning signal when the Transient Disturbance Signal identification module identifies that the possibility that breaks down is excessively high；The transient disturbance
Signal identification module is also connected to the fault data processing module, doubtful event of the fault data processing module to identifying
Barrier information is further judged and is handled；The fault data processing module is connected to the cable fault locating module, institute
It states the cable fault that cable fault locating module judges the fault data processing module to position, with quick obtaining electricity
The specific location of cable fault point.
2. a kind of distribution network cable initial failure positioning system based on transient disturbance according to claim 1, feature exist
In the system that, the Transient Disturbance Signal detection module and Transient Disturbance Signal identification module are the interference signals based on expert system
The operation for counting pattern identification, effective fault-signal is acquired.
3. a kind of distribution network cable initial failure positioning system based on transient disturbance according to claim 1, feature exist
In the collected fault-signal of measurement point can be carried out between modules signal conversion and data by the information transmission modular
Transmitting.
4. a kind of distribution network cable initial failure positioning system based on transient disturbance according to claim 1, feature exist
The reflection electricity such as the ground connection line current of cable, residual voltage, zero-sequence current are able to detect in, the Transient Disturbance Signal detection module
The electric characteristic amount of cable electrical characteristic.
5. a kind of distribution network cable initial failure positioning system based on transient disturbance according to claim 1, feature exist
In the Transient Disturbance Signal identification module can carry out multiclass disturbance to signal using neural network, support vector machine etc.
Identification.
6. a kind of distribution network cable initial failure positioning system based on transient disturbance according to claim 1, feature exist
In the fault data processing module and cable fault locating module carry out the cable initial failure based on Transient Disturbance Signal
Judgement and positioning.
7. a kind of distribution network cable initial failure positioning system based on of any of claims 1-6 based on transient disturbance
Control method, which is characterized in that the control method includes the following steps:
Step 1: transient voltage, current signal mutual inductor for installation, the side combined using modeling analysis and experimental test
Method carries out the theory analysis of system to the transient state travelling wave signal Transfer characteristic that initial failure generates；
Step 2: according to the basic principle of transient voltage, current signal mutual inductor, its Type Equivalent Circuit Model is established, to fault transient
Traveling wave carries out progress of disease test, obtains mutual inductor to parameters such as the progress of disease gain of signal, response delay, wave distortions according to test；
Step 3: the transient state travelling wave signal of first and second side being handled, when comparative analysis announcement transient state travelling wave passes through mutual inductor
The changed essence of secondary side signal, to the processing of secondary side fault-signal, the transient state travelling wave Mintrop wave of identification initial failure generation
The information that head signal contains；
Step 4: after determining that distribution is broken down, each measurement point current traveling wave Mintrop wave head height frequency component ωiPolarity η and energy
Measure the otherness that E is distributed in faulty line section and non-fault line section, construct accordingly faulty line section identification instruction because
Sub- ξfIt is shown below:
Wherein, ξfIndicator, η are recognized for the fault section that each current traveling wave measurement point detectsiAnd γiTo weigh accordingly
Value, the value can influence according to physical fault situation and mutual inductor to traveling wave propagation characteristic and predefine；First 3 of selection is most
The section where being faulty line that the big corresponding measurement point of fault section identification factor values is surrounded；
Step 5: the initial failure transient signal measured using all measurement points on fault section route considers that it propagates shortest path
Diameter and sign mutation point correspond to the moment, rationally determine that signal calculates frequency where data window length and the high fdrequency component to be extracted
Spectral limit extracts the amplitude and phase information of each measuring point transient state travelling wave signal Mintrop wave head height frequency component using S-transformation；Any measurement
Frequency is ω in the traveling wave Mintrop wave head that point A is detectediHigh-frequency signal can be expressed from the next:
Wherein,And θAi=-βiX is that the traveling wave Mintrop wave head signal intermediate frequency rate that measurement point A is obtained is ωiHigh frequency letter
Number amplitude and phase；
Step 6: illusory bus method is used, when considering that a certain position of route is broken down between different measurement points, according to above formula meter
Difference between the same high fdrequency component Amplitude Ration of the reality that obtained theoretically high fdrequency component Amplitude Ration and S-transformation are calculated
It is different, using the thought of iterative search, the corresponding hypothesis position of minimum difference is solved, then the corresponding practical true failure in this position
Exact position；
Step 7: in view of the result solved using single amplitude information may have pseudo- root, therefore calculating corresponding measurement
The notional phase difference and actual phase difference that corresponding measurement point same high fdrequency component is calculated while point Amplitude Ration, using same side
Formula solves failure exact position, then takes two ways to calculate the intersection of result, is enough to ensure that in this way in various situation failures
It is accurately positioned result and is free of pseudo- root.
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| CN201811239674.1A CN109324263A (en) | 2018-10-24 | 2018-10-24 | A kind of distribution network cable initial failure positioning system and its control method based on transient disturbance |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798245A (en) * | 2019-10-25 | 2020-02-14 | 袁茂银 | Underground cable fault early warning method and device based on single model |
| CN110868241A (en) * | 2019-10-25 | 2020-03-06 | 袁茂银 | Underground cable fault early warning method and device based on multiple models |
| CN110875851A (en) * | 2019-10-25 | 2020-03-10 | 袁茂银 | Underground cable fault early warning method and device |
| CN110927539A (en) * | 2019-12-05 | 2020-03-27 | 武汉理工大学 | Power distribution network fault section positioning method based on single-ended transient energy spectrum similarity |
| CN112505471A (en) * | 2020-09-29 | 2021-03-16 | 贵州电网有限责任公司 | Transient disturbance-based early fault early warning and positioning system and method for looped network cable |
| CN113466622A (en) * | 2021-06-29 | 2021-10-01 | 华北电力大学 | Early fault section positioning method based on active injection |
-
2018
- 2018-10-24 CN CN201811239674.1A patent/CN109324263A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798245A (en) * | 2019-10-25 | 2020-02-14 | 袁茂银 | Underground cable fault early warning method and device based on single model |
| CN110868241A (en) * | 2019-10-25 | 2020-03-06 | 袁茂银 | Underground cable fault early warning method and device based on multiple models |
| CN110875851A (en) * | 2019-10-25 | 2020-03-10 | 袁茂银 | Underground cable fault early warning method and device |
| CN110927539A (en) * | 2019-12-05 | 2020-03-27 | 武汉理工大学 | Power distribution network fault section positioning method based on single-ended transient energy spectrum similarity |
| CN112505471A (en) * | 2020-09-29 | 2021-03-16 | 贵州电网有限责任公司 | Transient disturbance-based early fault early warning and positioning system and method for looped network cable |
| CN113466622A (en) * | 2021-06-29 | 2021-10-01 | 华北电力大学 | Early fault section positioning method based on active injection |
| CN113466622B (en) * | 2021-06-29 | 2023-08-11 | 华北电力大学 | Early fault section positioning method based on active injection |
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