CN108303617A - A kind of fault location system - Google Patents
A kind of fault location system Download PDFInfo
- Publication number
- CN108303617A CN108303617A CN201810106287.4A CN201810106287A CN108303617A CN 108303617 A CN108303617 A CN 108303617A CN 201810106287 A CN201810106287 A CN 201810106287A CN 108303617 A CN108303617 A CN 108303617A
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- signal
- fault location
- location system
- phase
- line
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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
- G01R31/086—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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The present invention relates to a kind of fault location systems, including：Electroscope, for examining the energized state of circuit to be detected；Signal source, for exporting detection signal；Ground wire, for being connected to the earth and signal source；Signal injects line, for being connected to three-phase conducting wire and signal source；Write by hand device measures detection signal for receiving and editing clamp meter；Clamp meter detects signal for detecting three-phase line；And intelligent sensoring, the detection signal being used in non-contact inductive measurement three-phase line；The present invention solves the problems, such as that measurement accuracy is poor, interference free performance is poor, uses the measurement method of selecting type, is simple and efficient, and improves the stability and accuracy of measurement so that fault location it is more convenient with it is intuitive.
Description
Technical field
The present invention relates to one-phase earthing failure in electric distribution network inspection technical field, specifically a kind of fault location systems.
Background technology
In China's 6kV, 10kV and 35kV supply and distribution network, singlephase earth fault is that distribution line most circuits occurs
Failure, especially 10kV distributions are even more so.And considerable earth fault (especially stealthy earth fault, that is, soft touchdown)：Such as
Porcelain vase breakdown, inside transformer ground connection, arrester breakdown, the insulator breakdown etc. of mutual inductor ground connection, crane, staff is past
Toward needing with several hours, even tens hours could find earth fault.Since long-time cannot restore power transmission,
Not only social influence is very big, but also the electricity sales amount of power department is made to reduce, and directly influences the economic benefit of power department.This
Kind situation is more common in the distribution line in rural area, thus greatly reduces the power supply reliability of distribution.
Based on this, for limitation present in above-mentioned present situation, the present invention proposes a kind of event for improving and measuring convenience
Hinder positioning system.
Invention content
In order to solve above-mentioned the technical problems existing in the prior art, the present invention proposes a kind of improve and measures convenience
Positioning system.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of fault location system, including：
Electroscope, for examining the energized state of circuit to be detected；
Signal source, for exporting detection signal；
Ground wire, for being connected to the earth and signal source；
Signal injects line, for being connected to three-phase conducting wire and signal source；
Write by hand device measures detection signal for receiving and editing clamp meter；
Clamp meter detects signal for detecting three-phase line；And
Intelligent sensoring, the detection signal being used in non-contact inductive measurement three-phase line,
Wherein, the intelligent sensoring includes detection part and Rogowski coil, and the detection part is used for signal processing
And include the display screen on being set to detection part, the electroscope, signal source, ground wire, letter by signal processing results
Number injection line, write by hand device and clamp meter form contact fault location system, the electroscope, signal source, ground wire, signal note
Enter line, write by hand device and intelligent sensoring and forms contactless fault location system.
Further improvement of the present invention is that the algorithm in the clamp meter processor is dichotomy.
Further improvement of the present invention is, the signal for amplifying step by step and filtering step by step is provided in the detection part
Chain, by collected signal by obtaining actually detected signal after calculating.
Further improvement of the present invention is that the signal chains include the preamplifier communicated to connect successively, primary filter
Wave device, secondary amplifier, postifiler and conditioning circuit module, the conditioning circuit module are used for obtaining stable signal
Value.
Further improvement of the present invention is, is carried out wireless communication by RF modules in the system.
Further improvement of the present invention is, when the electric current of electric current maximum phase is more than 37.3mA, is filled using intelligent remote sensing
Set carry out fault location.When the electric current of electric current maximum phase is less than 37.3mA, fault location is carried out using clamp meter.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention solves that measurement accuracy is poor, interference free performance is poor
The problem of, the measurement method of selecting type is used, is simple and efficient, improves the stability and accuracy of measurement so that failure
Position it is more convenient with it is intuitive.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the system construction drawing of the present invention；
Fig. 2 is signal chains schematic diagram in intelligent sensoring 8 in the present invention；
Fig. 3 is the definition graph of operation principle in the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1 to Figure 2, a kind of fault location system, including：
Electroscope 1, for examining the energized state of circuit to be detected；
Signal source 2, for exporting detection signal；
Ground wire 3, for being connected to the earth and signal source；
Signal injects line 4, for being connected to three-phase conducting wire and signal source；
Write by hand device 5 measures detection signal for receiving and editing clamp meter；
Clamp meter 6 detects signal for detecting three-phase line；And
Intelligent sensoring 7, the detection signal being used in non-contact inductive measurement three-phase line,
Wherein, the intelligent sensoring 7 includes detection part and Rogowski coil, and the detection part is used for signal processing
And include the display screen on being set to detection part, the electroscope, signal source, ground wire, letter by signal processing results
Number injection line, write by hand device and clamp meter form contact fault location system, the electroscope, signal source, ground wire, signal note
Enter line, write by hand device and intelligent sensoring and forms contactless fault location system.
When it is implemented, the algorithm at the clamp meter in 6 reason devices is dichotomy.
When it is implemented, the signal chains amplified step by step and filtered step by step are provided in the detection part, it will be collected
Signal is by obtaining actually detected signal after calculating.
When it is implemented, the signal chains include the preamplifier communicated to connect successively, preliminary filter, secondary amplification
Device, postifiler and conditioning circuit module, the conditioning circuit module are used for obtaining stable signal value.The modulate circuit
Module is specially to carry out rejecting higher value, smaller value to the wave crest of all signal values measured within a certain period of time and remaining
Value carries out average value solution, to achieve the purpose that waveform is smooth, obtains the signal value closer to actual value, is missed to reduce
Difference.
When it is implemented, being carried out wireless communication by RF modules in the system.
When it is implemented, when the electric current of electric current maximum phase is more than 37.3mA, it is fixed to carry out failure using intelligent sensoring 7
Position.When the electric current of electric current maximum phase is less than 37.3mA, fault location is carried out using clamp meter 6.
The operation principle of the present invention is that：
Behind earth point direction and separate determination, when carrying out localization of fault, for the high efficiency of localization of fault, engineering
Upper generally use dichotomy is positioned, and is declined due to consideration that line distribution capacitance has the applied signal code in failure side
Subtract, so caused by need to considering distribution capacity electric leakage when judging current break using dichotomy using non-contact measurement mode
Measured value decays, and is not so easy to measure to decay caused by causing to leak electricity line distribution capacitance to be mistaken for earth point of passing by
And the current break occurred, as shown in figure 3, having been injected into a little in circuit head end, earth point is in line end, it is assumed that impedance ground R
Distribution capacity capacitive reactance Xc=21922.17 Ω equal to 10km under 40mA injection conditions, pass through Vector operation current distribution feelings
Condition isSince circuit three-phase distribution capacity is equal, then A phase currents, that is, a=9.33mA, B phases
Electric current, that is, a=9.33mA, C phase currents, that is, a+Z=37.3mA, the sum of three-phase current is 3a at decanting point for measuring apparatus
+ Z=56mA, in failure side line road midpoint electric current 3b+Z=42mA, midpoint current attenuation has been mutated 14mA, according to above-mentioned point
Analysis, as impedance ground R>The current attenuation Sudden Changing Rate of Xc=21922.17 Ω, failure side line road midpoint can be with the increasings of impedance
Increase greatly, simply by the presence of line length, there will be the decaying of electric current.When carrying out fault location using dichotomy, finally
Be at earth point to be judged before and after jump-value of current size determine location of fault, at the earth point before and after current break
Amount≤due to line distribution capacitance to current attenuation and caused by jump-value of current when, be that will appear erroneous judgement certainly in this way, this
Kind situation is not discussed.As long as the jump-value of current before and after at the place be more than due to line distribution capacitance to current attenuation and
Caused by jump-value of current when, theoretically when can use non-contact type measuring device, but in engineering in view of client makes
The fluctuation that contactless device caused by the problems such as irrationality, topography variation, external disturbance is possible measures, the two are prominent
The variable difference the big more is conducive to the accuracy and reliability of localization of fault, jump-value of current and 10km circuits before and after earth point
Midpoint distribution capacity at least difference 14mA between the attenuating mutation amount of electric current, and when impedance ground is equal to the appearance of 10km circuits
When anti-Xc=21922.17 Ω, Sudden Changing Rate 28mA-10km circuit midpoint distribution capacity is prominent to the decaying of electric current before and after earth point
Variable is 14mA, is equal to the value of aforementioned Sudden Changing Rate.
As long as can show that impedance ground is less than or equal to the capacitive reactance Xc=21922.17 Ω of 10km circuits from analysis above,
When carrying out localization of fault using non-contact measurement apparatus, even if appearing in failure side line road midpoint there is current attenuation
Mutation, but as long as being not more than 14mA, device is all that can use and can consider earth point in measurement point large size side, until adopting
It is more than that 28mA can consider earth point in the small size side of measurement point current break occur with dichotomy measurement, it is contemplated that intelligent remote sensing
Device is understood (at electric current maximum point) at 25 meters of point failure side of distance injection place by the schools by force three-phase current 56mA in actual use
35mA is just arrived, is changed then corresponding earthing position direction thresholding is just corresponding, as long as all may be used from original no more than 14mA devices
To use and can consider earth point in measurement point large size side, if become can using no more than 8.75mA devices and
It is considered that earth point is in measurement point large size side；It can consider more than 17.5mA until there is current break using dichotomy measurement
Earth point is in the small size side of measurement point.
Therefore the use condition for providing non-contact measurement apparatus is：Under the conditions of 10km, impedance ground R is necessarily less than
21922.17 Ω, then the size of impedance ground how is confirmed, to which selection is gone back using clamp meter positioning in fault location
It is non-contact measurement apparatus, the first step that may be used in localization of fault uses split-core type meter to judge ground connection direction and Earth Phase
When other, generated in Earth Phase by judging to be grounded when whether phase current is more than or equal to 10km line-to-grounds impedance=21922.17 Ω
Current value (37.3mA), so that it may to determine line-to-ground impedance magnitude indirectly, determine whether to be suitble to using contactless
Measuring device.
Similarly, if line length is 20km, the capacitor value R of circuit when impedance ground critical value has reformed into 20km
=10961.08 Ω, the current value generated at this time in Earth Phase are still 37.3mA.
Similarly, if line length is 30km, the capacitor value R of circuit when impedance ground critical value has reformed into 30km
=7307.39 Ω, the current value generated at this time in Earth Phase are still 37.3mA.
Similarly, if line length is 50km, the capacitor value R of circuit when impedance ground critical value has reformed into 30km
=4384.43 Ω, the current value generated at this time in Earth Phase are still 37.3mA.
As can be seen from the above analysis, the length of circuit is only influenced using connecing corresponding to non-contact type measuring device
Ground impedance critical condition, in actual use, even if knowing that line impedance is much, but do not know to chant folk tales to the accompaniment of simple percussion instruments in line length
Under condition, it is difficult that difference uses that equipment on earth to be, but if whether being more than 37.3mA as criterion using ground connection phase current
Words need not just consider, physical fault circuit have how long and corresponding ground connection critical impedance have it is much, need to be in fault location
The first step determine fault direction with it is separate when, measure whether obtained ground connection phase current is more than 37.3mA thresholdings by clamp meter 6
Value still carries out localization of fault using intelligent sensoring 7 to determine that follow-up earth point navigates to bottom using clamp meter 6.
The fact applied at the scene by above-mentioned analysis and non-contact type measuring device obtains fault location strategy such as
Under：
The first step：Clamp meter 6 must be used to measure decanting point both sides three-phase electricity flow valuve, still whether put down using three-phase current
Weighing apparatus strategy judges to be grounded direction and ground connection is separate；
Second step：Judge whether the electric current of electric current maximum phase is more than 37.3mA, intelligence can be used if more than 37.3mA suggestions
Sensoring 7 carry out fault location, as long as using dichotomy failure side carry out fault location when jump-value of current 17.5mA,
It is believed that earth point of passing by, if but encounter T links for the accuracy of localization of fault, it is proposed that carried out using clamp meter 6
Localization of fault；
Third walks：If judging whether the electric current of electric current maximum phase is less than 37.3mA, then completely being determined using clamp meter 6
Position.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (6)
1. a kind of fault location system, which is characterized in that including：
Electroscope, for examining the energized state of circuit to be detected；
Signal source, for exporting detection signal；
Ground wire, for being connected to the earth and signal source；
Signal injects line, for being connected to three-phase conducting wire and signal source；
Write by hand device measures detection signal for receiving and editing clamp meter；
Clamp meter detects signal for detecting three-phase line；And
Intelligent sensoring, the detection signal being used in non-contact inductive measurement three-phase line,
Wherein, the intelligent sensoring includes detection part and Rogowski coil, the detection part be used for signal processing and
Include the display screen on being set to detection part, the electroscope, signal source, ground wire, signal note by signal processing results
Enter line, write by hand device and clamp meter composition contact fault location system, the electroscope, signal source, ground wire, signal injection
Line, write by hand device and intelligent sensoring form contactless fault location system.
2. a kind of fault location system according to claim 1, it is characterised in that：Algorithm in the clamp meter processor
For dichotomy.
3. a kind of fault location system according to claim 1, it is characterised in that：It is provided with step by step in the detection part
Amplification and the signal chains filtered step by step, by collected signal by obtaining actually detected signal after calculating.
4. a kind of fault location system according to claim 3, it is characterised in that：The signal chains include communication link successively
Preamplifier, preliminary filter, secondary amplifier, postifiler and the conditioning circuit module connect, the modulate circuit mould
Block is used for obtaining stable signal value.
5. a kind of fault location system according to claim 1, it is characterised in that：It is carried out by RF modules in the system
Wireless communication.
6. a kind of fault location system according to claim 1, it is characterised in that：When the electric current of electric current maximum phase is more than
When 37.3mA, fault location is carried out using intelligent sensoring.When the electric current of electric current maximum phase is less than 37.3mA, flowed using pincers
Table carries out fault location.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810106287.4A CN108303617A (en) | 2018-02-02 | 2018-02-02 | A kind of fault location system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810106287.4A CN108303617A (en) | 2018-02-02 | 2018-02-02 | A kind of fault location system |
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| CN108303617A true CN108303617A (en) | 2018-07-20 |
Family
ID=62850932
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| CN201810106287.4A Pending CN108303617A (en) | 2018-02-02 | 2018-02-02 | A kind of fault location system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346688A (en) * | 2019-07-31 | 2019-10-18 | 广东电网有限责任公司 | A kind of high pressure complexity cable fault quick segmentation differentiates and localization method |
| CN111700605A (en) * | 2019-03-18 | 2020-09-25 | 西门子医疗有限公司 | Detecting interference in measuring bioelectric signals |
| CN113655402A (en) * | 2021-08-10 | 2021-11-16 | 长春北晨智能科技有限公司 | Detection system based on impedance type grounding judgment strategy and measurement method thereof |
| CN114675139A (en) * | 2022-05-30 | 2022-06-28 | 辽宁汉华信息工程有限公司 | Method and system for determining position of power grid line fault |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111700605A (en) * | 2019-03-18 | 2020-09-25 | 西门子医疗有限公司 | Detecting interference in measuring bioelectric signals |
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| CN110346688A (en) * | 2019-07-31 | 2019-10-18 | 广东电网有限责任公司 | A kind of high pressure complexity cable fault quick segmentation differentiates and localization method |
| CN113655402A (en) * | 2021-08-10 | 2021-11-16 | 长春北晨智能科技有限公司 | Detection system based on impedance type grounding judgment strategy and measurement method thereof |
| CN114675139A (en) * | 2022-05-30 | 2022-06-28 | 辽宁汉华信息工程有限公司 | Method and system for determining position of power grid line fault |
| CN114675139B (en) * | 2022-05-30 | 2022-08-16 | 辽宁汉华信息工程有限公司 | Method and system for determining position of power grid line fault |
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Application publication date: 20180720 |