CN106646132A - Single-phase grounding fault positioning rear-end fault indicator through signal active injection method, and positioning method therefor - Google Patents
Single-phase grounding fault positioning rear-end fault indicator through signal active injection method, and positioning method therefor Download PDFInfo
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- CN106646132A CN106646132A CN201611169045.7A CN201611169045A CN106646132A CN 106646132 A CN106646132 A CN 106646132A CN 201611169045 A CN201611169045 A CN 201611169045A CN 106646132 A CN106646132 A CN 106646132A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000002347 injection Methods 0.000 title abstract description 4
- 239000007924 injection Substances 0.000 title abstract description 4
- 238000004891 communication Methods 0.000 claims description 23
- 238000005070 sampling Methods 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 claims description 4
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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
- G01R31/086—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
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Locating Faults (AREA)
Abstract
The invention proposes a single-phase grounding fault positioning rear-end fault indicator through a signal active injection method, and a positioning method therefor. The indicator and method are suitable for a small-current grounding system, and carry out the selection of a fault line and the positioning of a fault point when a single-phase grounding fault happens. When the single-phase grounding fault happens in a power distribution network and the fault line and fault phase are determined, a signal generator installed at an outgoing line end injects a signal into the system, i.e., temporarily connecting a grounding thyristor connected to one non-fault phase, and forming a temporary two-phase nonlocal grounding short-circuit loop with the grounding fault. Moreover, the short-circuit loop will generate a fault signal different from a power frequency signal, and the rear-end fault indicator which is installed on the whole power distribution system in a distributed manner can effectively recognize the fault signal. The indicator is simple in structure, is high in positioning accuracy, is lower in cost, and is easy to popularize.
Description
Technical field
The present invention relates to field of power distribution, more particularly to route selection and the localization method of singlephase earth fault.
Background technology
Singlephase earth fault is the modal failure of distribution system, is mostly occurred in moist, rainy weather.Due to screen of trees, match somebody with somebody
In electric line insulator it is single-phase puncture, the factors such as single-phase wire break and toy harm cause.Single-phase earthing not only shadow
The normal power supply of user is rung, and overvoltage may have been produced, burnt out equipment, or even caused phase fault and expansion accident.Though
So singlephase earth fault is incidence highest failure in power system, but is accurately positioned but one for singlephase earth fault
Directly fail to be well solved.In order to judge the position of trouble point as soon as possible, so as to fix a breakdown secondary failure is avoided
The even harm of power-off, it is proposed that active injecting signal carries out Fault Locating Method and technology.
The content of the invention
The invention provides a kind of active injecting signal singlephase earth fault positioning rear end fault detector and its positioning
Method, to the route selection and the orientation problem that solve single-phase grounded malfunction in grounded system of low current.
The technical scheme is that when there is singlephase earth fault in distribution, being installed on the signal generator of circuit first section
There is a fault-signal for being different from power frequency component.Rear end fault detector of the distributing installation in whole distribution system is to letter
Number carry out effectively identification, extract and spectrum analysis is carried out to it, judge the signal characteristic, then by built-in SIM to
Transformer station sends fault-signal so as to carry out fault location.
The present invention is achieved by the following technical solution.
By power module, sensing module, digital sampling and processing, four parts of communication module sequentially connect and compose；Its
In：
Power module obtains electric energy and meets fault detector normal work needs by sensing electricity taking coil from circuit, while
The module is powered when being used for power failure or Smaller load with reserve battery for fault detector；Electricity taking coil is using power taking efficiency high
The iron core of broken not alloy material；The electric current that senses from circuit of sensing electricity taking coil by Power Control and protection module, one
Part is sent to power management module sampling, and power management module and dc source mould are supplied electricity to after the rectified filtering of another part
Block, DC power supplier is charged the battery according to power management module instruction or is powered to second level dc source, and second
Level dc source provides electric energy for whole indicator circuit；
Sensing module is by sampling coil sensor current signal, while obtaining line voltage distribution letter by induction field change
Number, and signal is sent to into signal conditioning circuit；Sampling coil is iron core-closed using the high silicon steel sheet of accuracy in detection.
Digital sampling and processing, one-chip computer module and voltage, current regulating circuit composition, current regulating circuit will sample
Current signal is changed into data signal and is sent to fault detector host scm module, voltage modulate circuit on the circuit that coil gets
The voltage signal for sensing is changed into into data signal and is sent to fault detector host scm module；Again signal is carried out by single-chip microcomputer
Analog-to-digital conversion is gone forward side by side line algorithm computing, determines whether the presence of POWER SYSTEM DISTURBANCE SIGNALS；
Communication module realizes that low-power consumption mechanism is by time duty using the radio-frequency communication module of the 433MHz of low-power consumption
Than designing less radio-frequency two-way communication mode, 5s intercepts the aerial carrier signals of 25ms, and address matches carries out data interaction.By
Single-chip microcomputer judged result is sent to communication terminal by communication module by radio communication mode.
The present invention fault location is carried out according to above-mentioned fault location rear end fault detector method be：
(1) the rear end fault detector is numbered；
(2) judge that last detects the rear end fault detector of current disturbing signal and first does not connect detection electric current
Position between the rear end fault detector of disturbing signal is that failure occurs position；
Active injecting signal singlephase earth fault positioning rear end fault detector using method of the present invention also includes：
The mode of the warning message that rear end fault detector of the present invention sends is：1. rear end fault detector is adopted
Carrying out breakdown judge, the characteristic signal of extraction is non-power frequency component to feature signal extraction；2. it is sent to far by communication system
The malfunction monitoring main station system of side；3. rear end fault detector locally by state change is informing power circuit attendant.
Beneficial effects of the present invention：The present invention produces controllable electric signal by controllable interference signal source, not to power train
On the premise of system causes any harmful effect, the microvariations on voltage and current waveform are formed；Using signal monitoring terminal-pair electricity
Flow disturbance carries out feature extraction and analysis, realizes fault location.On the premise of circuit normal work is not affected, to single-phase earthing
Failure is accurately positioned.Principle is simple, and positional accuracy is high, and cost is relatively low, it is easy to promote.
Description of the drawings
With reference to the accompanying drawings and examples the invention will be further described：
Fig. 1 active injecting signals singlephase earth fault positions rear end fault detector schematic diagram；
The operating diagram of Fig. 2 present invention；
The fault location schematic flow sheet of Fig. 3 present invention.
Specific embodiment
With reference to the accompanying drawings and examples the invention will be further described：
See Fig. 1, active injecting signal singlephase earth fault positions rear end fault detector, the invention is characterised in that：
By power module, sensing module, digital sampling and processing, four parts of communication module sequentially connect and compose；Its
In：
Power module obtains electric energy and meets fault detector normal work needs by sensing electricity taking coil from circuit, while
The module is powered when being used for power failure or Smaller load with reserve battery for fault detector；Electricity taking coil is using power taking efficiency high
The iron core of broken not alloy material；The electric current that senses from circuit of sensing electricity taking coil by Power Control and protection module, one
Part is sent to power management module sampling, and power management module and dc source mould are supplied electricity to after the rectified filtering of another part
Block, DC power supplier is charged the battery according to power management module instruction or is powered to second level dc source, and second
Level dc source provides electric energy for whole indicator circuit；
Sensing module is by sampling coil sensor current signal, while obtaining line voltage distribution letter by induction field change
Number, and signal is sent to into signal conditioning circuit.Sampling coil is iron core-closed using the high silicon steel sheet of accuracy in detection；
Digital sampling and processing, one-chip computer module and voltage, current regulating circuit composition, current regulating circuit will sample
Current signal is changed into data signal and is sent to fault detector host scm module, voltage modulate circuit on the circuit that coil gets
The voltage signal for sensing is changed into into data signal and is sent to fault detector host scm module；Again signal is carried out by single-chip microcomputer
Analog-to-digital conversion is gone forward side by side line algorithm computing, determines whether the presence of POWER SYSTEM DISTURBANCE SIGNALS；
Communication module realizes that low-power consumption mechanism is by time duty using the radio-frequency communication module of the 433MHz of low-power consumption
Than designing less radio-frequency two-way communication mode, 5s intercepts the aerial carrier signals of 25ms, and address matches carries out data interaction；By
Single-chip microcomputer judged result is sent to communication terminal by communication module by radio communication mode.
The present invention fault location is carried out according to above-mentioned fault location rear end fault detector method be：
(1) the rear end fault detector is numbered；
(2) judge that last detects the rear end fault detector of current disturbing signal and first does not connect detection electric current
Position between the rear end fault detector of disturbing signal is that failure occurs position.
Active injecting signal singlephase earth fault positioning rear end fault detector using method of the present invention also includes：
The mode of the warning message that rear end fault detector of the present invention sends is：1. rear end fault detector is adopted
Carrying out breakdown judge, the characteristic signal of extraction is non-power frequency component to feature signal extraction；2. it is sent to far by communication system
The malfunction monitoring main station system of side；3. rear end fault detector locally by state change is informing power circuit attendant.
When the turn on thyristors angle positioned at the active Injection Signal source of circuit outlet reaches certain number of degrees, in two-phase in short-term
The fault-signal that rear end fault detector in the earth fauit loops of strange land is extracted can effectively recognize that the rear end such as in figure is former
Barrier indicator 1 and 16, therefore can be by fault location between rear end fault detector 16 and 19.
Rear end fault detector carries out spectrum analysis by extracting the signal that signal generator injects to system to it,
Judge that the signal is different from after failure the obvious characteristic without signal during turn on thyristors, then by built-in SIM to change
Power station sends fault-signal so as to carry out fault location, and its workflow diagram is by shown in accompanying drawing 2.
The first step, when signal generator is to system Injection Signal, can send working signal and give rear end fault detector, after
End fault detector collection line current, extracts fault-signal, and line frequency analysis of spectrum of going forward side by side judges whether to meet initial criteria.
Second step, if the spectrum signature of fault-signal does not meet initial criteria, to signal generator feedback signal
" 0 ", waiting signal generator increases the working signal after the angle of flow, and carries out above workflow again.If fault-signal
Spectrum signature meet initial criteria, rear end fault detector will send effectively identification signal by SIM to transformer station, so as to
Carry out fault location.To also be communicated with signal generator simultaneously, to its feedback signal " 1 " so as to quit work.
Claims (3)
1. active injecting signal singlephase earth fault positions rear end fault detector, it is characterised in that：
By power module, sensing module, digital sampling and processing, four parts of communication module sequentially connect and compose；Wherein：
Power module obtains electric energy and meets fault detector normal work needs by sensing electricity taking coil from circuit, while the mould
Block is powered when being used for power failure or Smaller load with reserve battery for fault detector；Electricity taking coil using power taking efficiency high it is broken not
The iron core of alloy material；The electric current that sensing electricity taking coil is sensed from circuit is by Power Control and protection module, a part
Power management module sampling is sent to, power management module and DC power supplier is supplied electricity to after the rectified filtering of another part, directly
Stream power module is charged the battery according to power management module instruction or is powered to second level dc source, second level direct current
Power supply provides electric energy for whole indicator circuit；
Sensing module is by sampling coil sensor current signal, while line voltage signal is obtained by induction field change, and
Signal is sent to into signal conditioning circuit；Sampling coil is iron core-closed using the high silicon steel sheet of accuracy in detection；
Digital sampling and processing, one-chip computer module and voltage, current regulating circuit composition, current regulating circuit is by sampling coil
Current signal is changed into data signal and is sent to fault detector host scm module on the circuit for getting, and voltage modulate circuit will be felt
The voltage signal that should be arrived is changed into data signal and is sent to fault detector host scm module；Again signal is carried out into modulus by single-chip microcomputer
Line algorithm computing of going forward side by side is changed, the presence of POWER SYSTEM DISTURBANCE SIGNALS is determined whether；
Communication module using low-power consumption 433MHz radio-frequency communication module, realize low-power consumption mechanism be by duty ratio of time come
Design less radio-frequency two-way communication mode, 5s intercepts the aerial carrier signals of 25ms, and address matches carries out data interaction；By communicating
Single-chip microcomputer judged result is sent to communication terminal by module by radio communication mode.
2. active injecting signal singlephase earth fault according to claim 1 positions the positioning side of rear end fault detector
Method, it is characterised in that：It is described carry out fault location method be：
(1) the rear end fault detector is numbered；
(2) judge that last detects the rear end fault detector of current disturbing signal and first does not connect detection current disturbing
Position between the rear end fault detector of signal is that failure occurs position.
3. active injecting signal singlephase earth fault according to claim 2 positions the positioning side of rear end fault detector
Method, it is characterised in that：
The mode of the warning message that described rear end fault detector sends is：1. rear end fault detector is carried using characteristic signal
Fetching carries out breakdown judge, and the characteristic signal of extraction is non-power frequency component；2. the failure prison in a distant place is sent to by communication system
Survey main station system；3. rear end fault detector locally by state change is informing power circuit attendant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611169045.7A CN106646132A (en) | 2016-12-16 | 2016-12-16 | Single-phase grounding fault positioning rear-end fault indicator through signal active injection method, and positioning method therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611169045.7A CN106646132A (en) | 2016-12-16 | 2016-12-16 | Single-phase grounding fault positioning rear-end fault indicator through signal active injection method, and positioning method therefor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107688134A (en) * | 2017-07-03 | 2018-02-13 | 临沂大学 | Distribution network failure indicator |
| CN107918079A (en) * | 2017-11-17 | 2018-04-17 | 云南电网有限责任公司电力科学研究院 | A kind of one-phase earthing failure in electric distribution network localization method and system based on frequency sweep injection |
| CN108020737A (en) * | 2017-11-17 | 2018-05-11 | 国网浙江省电力公司 | A kind of distribution line monitoring method |
| CN108802557A (en) * | 2018-06-28 | 2018-11-13 | 安徽康能电气有限公司 | A kind of fault locator based on disturbing signal |
| CN108802575A (en) * | 2018-07-05 | 2018-11-13 | 云南电网有限责任公司电力科学研究院 | A kind of line fault localization method, apparatus and system based on power disturbance method |
| US10481180B2 (en) | 2017-11-17 | 2019-11-19 | Industrial Technology Research Institute | Method for sensing power consumption and sensing device |
| CN113589095A (en) * | 2021-06-26 | 2021-11-02 | 国网山东省电力公司济宁供电公司 | Integrated single-phase earth fault intelligent identification and positioning system and method |
| CN114675133A (en) * | 2022-04-12 | 2022-06-28 | 贵州电网有限责任公司 | Power distribution network fault diagnosis positioning method |
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| CN101937015A (en) * | 2010-08-27 | 2011-01-05 | 西安交通大学 | Device for online monitoring lightning current and lightning voltage waveform parameters of overhead transmission line |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107688134A (en) * | 2017-07-03 | 2018-02-13 | 临沂大学 | Distribution network failure indicator |
| CN107918079A (en) * | 2017-11-17 | 2018-04-17 | 云南电网有限责任公司电力科学研究院 | A kind of one-phase earthing failure in electric distribution network localization method and system based on frequency sweep injection |
| CN108020737A (en) * | 2017-11-17 | 2018-05-11 | 国网浙江省电力公司 | A kind of distribution line monitoring method |
| US10481180B2 (en) | 2017-11-17 | 2019-11-19 | Industrial Technology Research Institute | Method for sensing power consumption and sensing device |
| CN107918079B (en) * | 2017-11-17 | 2021-03-12 | 云南电网有限责任公司电力科学研究院 | Power distribution network single-phase earth fault positioning method and system based on sweep frequency injection |
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| CN108802575A (en) * | 2018-07-05 | 2018-11-13 | 云南电网有限责任公司电力科学研究院 | A kind of line fault localization method, apparatus and system based on power disturbance method |
| CN113589095A (en) * | 2021-06-26 | 2021-11-02 | 国网山东省电力公司济宁供电公司 | Integrated single-phase earth fault intelligent identification and positioning system and method |
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