CN110244189A - A kind of power circuit Earth design method - Google Patents
A kind of power circuit Earth design method Download PDFInfo
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- CN110244189A CN110244189A CN201910651308.5A CN201910651308A CN110244189A CN 110244189 A CN110244189 A CN 110244189A CN 201910651308 A CN201910651308 A CN 201910651308A CN 110244189 A CN110244189 A CN 110244189A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a kind of power circuit Earth design methods, more particularly to electric power system fault field of locating technology, specifically comprise the following steps: step 1, inquiry is obtained position at the substation of power supply line, is substantially discharged each phase line of cable over the ground using discharging rod；Step 2, the plug of action of low-voltage pulse p-wire and the action of low-voltage pulse socket of test device are connected, and two clamps of p-wire are connect with two failure phase lines；Step 3, according to the suitable velocity of wave of the type set of cable, by action of low-voltage pulse p-wire to test cable by one action of low-voltage pulse of injection.The fault distance and fault location that the present invention obtains are more accurate, it can reduce and the deviation of actual fault point, to improve the accuracy to fault location, and pass through the polarity of perception reflex pulse, it can be determined that the property of failure, workload of the user when carrying out feeder line fault detection is reduced, and precision easy to operate is high.
Description
Technical field
The present invention relates to electric power system fault field of locating technology, it is more particularly related to a kind of power circuit
Earth design method.
Background technique
The power distribution network in China is all made of neutral point not direct grounding way (NUGS) at present, when since ground fault occurs,
The electric current for flowing through grounding point is small, so being called small current neutral grounding system.Small current neutral grounding system can be divided into neutral point and not connect
Ground system (NUS), Neutral Grounding through Resistance in Electrical system (NRS) and neutral by arc extinction coil grounding system (NES).In ground connection event
When barrier occurs, since three line voltages are still symmetrical, especially neutral by arc extinction coil grounding system flows through the electricity of grounding point
Very little is flowed, does not influence continuously to power to load, " power system security regulation " regulation can still continue to run 0.5-2 hour,
But small current neutral grounding system, in single-phase earthing, non-faulting phase voltage can be upgraded to line voltage, operate with failure for a long time easily
Arc grounding is generated, two points ground fault failure is formed, causes system overvoltage, to influence the safety of system.It can carry out at present
Failure line selection, and there are many kinds of existing line selection apparatus, but due to only installing current transformer, Zhi Nengxuan at line outlet
Line not can be carried out fault location, and patrolling method is usually taken, but some failures are difficult to against range estimation, difficulty and work
Amount is very big, some units carry out troubleshooting by La Lujia line walking, seriously affects the reliability of power supply.
In existing Fault Locating Method, Low Voltage Impulse Method is used for low-resistance, short circuit and the disconnection fault of cable；It can also be used in
Measure length, the wave velocity of cable；It can also be used for distinguishing medial head, T connector and the terminals of cable.Low Voltage Impulse Method can
Above-mentioned various faults test problems are solved, fault location can be carried out, difficulty is low, workload is small, and what will not be powered to influence can
It leans on, but this kind of method is inaccurate to fault location when detecting, can not also obtain the type of cable fault.
Summary of the invention
In order to overcome the drawbacks described above of the prior art, the embodiment of the present invention provides a kind of power circuit Earth design
Method, by injecting an action of low-voltage pulse, generation when pulse travels to impedance mismatch point along test cable to cable in test
Reflection, is collected display to the impulse waveform after reflection and calculates fault distance, and under the premise of waveforms amplitude is distortionless,
Reflected impulse is amplified, changes waveforms amplitude by waveform horizontal scaling and obtains high resolution of ranging, to improve reflected impulse
To the expression at impedance mismatch point, so that calculating, the fault distance obtained is more accurate, reduces inclined with actual fault point
Difference, to improve the accuracy to fault location, during impulse ejection and reflection, disconnection fault reflected impulse and transmitting arteries and veins
Rush that polarity is identical, reflected impulse and the transmitting pulse polarity of short-circuit mix line fault, can on the contrary, pass through the polarity of perception reflex pulse
To determine the property of failure, workload of the user when carrying out feeder line fault detection is reduced, and precision easy to operate is high.
To achieve the above object, the invention provides the following technical scheme: a kind of power circuit Earth design method, tool
Body includes the following steps:
Step 1, inquiry obtains position at the substation of power supply line, using discharging rod that each phase line of cable is abundant over the ground
Electric discharge；
Step 2 connects the plug of action of low-voltage pulse p-wire and the action of low-voltage pulse socket of test device, the two of p-wire
A clamp is connect with two failure phase lines；
Step 3, according to the suitable velocity of wave of the type set of cable, by action of low-voltage pulse p-wire to test cable by note
Enter an action of low-voltage pulse, pulse encounters impedance mismatch point along cable distribution, and pulse generates reflection, is transmitted back to measurement point and is tested trial assembly
Set record；
Step 4 carries out timing in action of low-voltage pulse transmitting, is counted as when the reflected impulse of impedance mismatch point is received
△ t, pulse traveling wave spread speed are counted as V, then fault point distance Lx are as follows:
Mismatch the reflection coefficient ρ of point are as follows:
Wherein ZiFor the input impedance of fault point, ZcFor the characteristic impedance of route；
Step 5, the reflected impulse that will acquire are shown that the initial position of reflected pulse waveform is abort situation, are passed through
Vector operation obtains the distance that test cable starting point begins with significant change position to impulse waveform, obtains the failure of primary Calculation
Distance；
Step 6 keeps in the reflected pulse waveform obtained in above-mentioned steps, and based on above-mentioned test environment, surveys
An intact cable is tried, reflected pulse waveform is obtained, by temporary faulty line reflection configuration and intact cable reflection waveform ratio
Compared with, obtain two waveforms in the similarities and differences, will at the difference in comparison of wave shape propose, by vector operation obtain difference to cable rise
Distance at point, obtains the fault distance of secondary calculating, and take multiple measurements, the fault distance and primary Calculation to acquisition
Fault distance is averaged, and obtains power circuit ground fault location information according to the trend of cable and fault distance.
In a preferred embodiment, the reflected impulse of acquisition is also adjusted gain, undistorted in waveforms amplitude
Under the premise of, reflected impulse is amplified, waveforms amplitude is changed.
In a preferred embodiment, disconnection fault reflected impulse is identical as transmitting pulse polarity, short-circuit swinging cross event
The reflected impulse of barrier is opposite with transmitting pulse polarity.
In a preferred embodiment, by waveform horizontal scaling, high resolution of ranging is obtained, and waveform is amplifying
State can not be automatically positioned.
Technical effect and advantage of the invention:
1, by injecting an action of low-voltage pulse to cable in test, when pulse travels to impedance mismatch point along test cable
Reflection is generated, display is collected to the impulse waveform after reflection and calculates fault distance, and before waveforms amplitude is distortionless
It puts, reflected impulse is amplified, change waveforms amplitude by waveform horizontal scaling and obtain high resolution of ranging, to improve reflection
Expression at pulse pair impedance mismatch point reduces and actual fault point so that the fault distance for calculating acquisition is more accurate
Deviation, to improve to the accuracy of fault location；
2, during impulse ejection and reflection, disconnection fault reflected impulse is identical as transmitting pulse polarity, and short circuit is mixed
Reflected impulse and the transmitting pulse polarity of line failure are on the contrary, pass through the polarity of perception reflex pulse, it is possible to determine that the property of failure,
Workload of the user when carrying out feeder line fault detection is reduced, and precision easy to operate is high.
Detailed description of the invention
Fig. 1 is the transmitting pulse obtained in step five of the invention and reflected pulse waveform figure.
Fig. 2 is the transmitting pulse obtained in step six of the invention and reflected pulse waveform and temporary transmitting pulse and reflection
Timing chart.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
A kind of power circuit Earth design method as shown in Figs. 1-2, specifically comprises the following steps:
Step 1, inquiry obtains position at the substation of power supply line, using discharging rod that each phase line of cable is abundant over the ground
Electric discharge；
Step 2 connects the plug of action of low-voltage pulse p-wire and the action of low-voltage pulse socket of test device, the two of p-wire
A clamp is connect with two failure phase lines；
Step 3, according to the suitable velocity of wave of the type set of cable, by action of low-voltage pulse p-wire to test cable by note
Enter an action of low-voltage pulse, pulse encounters impedance mismatch point along cable distribution, and pulse generates reflection, is transmitted back to measurement point and is tested trial assembly
Set record；
Step 4 carries out timing in action of low-voltage pulse transmitting, is counted as when the reflected impulse of impedance mismatch point is received
△ t, pulse traveling wave spread speed are counted as V, then fault point distance Lx are as follows:
Mismatch the reflection coefficient ρ of point are as follows:
Wherein ZiFor the input impedance of fault point, ZcFor the characteristic impedance of route；
Step 5, the reflected impulse that will acquire are shown that the initial position of reflected pulse waveform is abort situation, are passed through
Vector operation obtains the distance that test cable starting point begins with significant change position to impulse waveform, obtains the failure of primary Calculation
Distance；
Step 6 keeps in the reflected pulse waveform obtained in above-mentioned steps, and based on above-mentioned test environment, surveys
An intact cable is tried, reflected pulse waveform is obtained, by temporary faulty line reflection configuration and intact cable reflection waveform ratio
Compared with, obtain two waveforms in the similarities and differences, will at the difference in comparison of wave shape propose, by vector operation obtain difference to cable rise
Distance at point, obtains the fault distance of secondary calculating, and take multiple measurements, the fault distance and primary Calculation to acquisition
Fault distance is averaged, and obtains power circuit ground fault location information according to the trend of cable and fault distance.
Embodiment 2
It on the basis of embodiment 1, further, can also be to arteries and veins during carrying out the display of reflected pulse waveform
It rushes waveform and is adjusted gain, to improve the display precision of reflected pulse waveform, specifically comprise the following steps:
The plug of action of low-voltage pulse p-wire and the action of low-voltage pulse socket of test device are connected, two clamps of p-wire with
The connection of two failure phase lines；
According to the suitable velocity of wave of the type set of cable, by action of low-voltage pulse p-wire to test cable by one low pressure of injection
Pulse, pulse encounter impedance mismatch point along cable distribution, and pulse generates reflection, are transmitted back to measurement point device being tested record,
Timing is carried out in action of low-voltage pulse transmitting, △ t is counted as when the reflected impulse of impedance mismatch point is received, pulse traveling wave is propagated
Speed is counted as V, then fault point distance Lx are as follows:
Mismatch the reflection coefficient ρ of point are as follows:
Wherein ZiFor the input impedance of fault point, ZcFor the characteristic impedance of route；
The reflected impulse that will acquire is adjusted gain, under the premise of waveforms amplitude is distortionless, amplifies to reflected impulse,
Change waveforms amplitude, then shown, the initial position of reflected pulse waveform is abort situation, is obtained and is surveyed by vector operation
Examination cable starting point begins with the distance of significant change position to impulse waveform, obtains the fault distance of primary Calculation；
The reflected pulse waveform obtained in above-mentioned steps is kept in, and based on above-mentioned test environment, tests one
Intact cable obtains reflected pulse waveform, and temporary faulty line reflection configuration and intact cable reflection waveform comparison obtain
The similarities and differences in two waveforms will propose at the difference in comparison of wave shape, be obtained at difference by vector operation to cable starting point
Distance, obtains the fault distance of secondary calculating, and takes multiple measurements, the failure of fault distance and primary Calculation to acquisition away from
From averaging, power circuit ground fault location information is obtained according to the trend of cable and fault distance.
Embodiment 3
On the basis of embodiment 2, disconnection fault reflected impulse with transmitting pulse polarity it is identical, short-circuit mix line fault it is anti-
It penetrates pulse and emits pulse polarity on the contrary, therefore passing through the polarity of perception reflex pulse, it is possible to determine that the property of failure；
As shown in Figure 1, waveform is downward at failure, therefore it is judged as short trouble, if waveform is upward, for disconnection fault；
When carrying out concrete application, include the following steps:
The plug of action of low-voltage pulse p-wire and the action of low-voltage pulse socket of test device are connected, two clamps of p-wire with
Two failure phase lines connection, according to the suitable velocity of wave of the type set of cable, by action of low-voltage pulse p-wire to test cable by note
Enter an action of low-voltage pulse, pulse encounters impedance mismatch point along cable distribution, and pulse generates reflection, is transmitted back to measurement point and is tested trial assembly
Set record；
Timing is carried out in action of low-voltage pulse transmitting, is counted as △ t, pulse when the reflected impulse of impedance mismatch point is received
Traveling wave spread speed is counted as V, then fault point distance Lx are as follows:
Mismatch the reflection coefficient ρ of point are as follows:
Wherein ZiFor the input impedance of fault point, ZcFor the characteristic impedance of route；
The reflected impulse that will acquire shown, the initial position of reflected pulse waveform is abort situation, and disconnection fault
Reflected impulse is identical as transmitting pulse polarity, and the reflected impulse and transmitting pulse polarity of short-circuit mix line fault are on the contrary, such as Fig. 1 institute
Show, waveform is downward at failure, therefore is judged as short trouble；
The distance for beginning with significant change position to impulse waveform by vector operation acquisition test cable starting point, obtains just
Walk the fault distance calculated；
The reflected pulse waveform obtained in above-mentioned steps is kept in, and based on above-mentioned test environment, tests one
Intact cable obtains reflected pulse waveform, and temporary faulty line reflection configuration and intact cable reflection waveform comparison obtain
The similarities and differences in two waveforms will propose at the difference in comparison of wave shape, be obtained at difference by vector operation to cable starting point
Distance, obtains the fault distance of secondary calculating, and takes multiple measurements, the failure of fault distance and primary Calculation to acquisition away from
From averaging, power circuit ground fault location information is obtained according to the trend of cable and fault distance.
By the way that during impulse ejection and reflection, disconnection fault reflected impulse is identical as transmitting pulse polarity, short circuit
Reflected impulse and the transmitting pulse polarity of mix line fault are on the contrary, pass through the polarity of perception reflex pulse, it is possible to determine that the property of failure
Matter reduces workload of the user when carrying out feeder line fault detection, and precision easy to operate is high.
Embodiment 4
On the basis of the above embodiments, further, also high resolution of ranging can be obtained by waveform horizontal scaling,
Close-up is carried out, to improve the precision to power circuit Earth design, reduces to be measured by display error bring and miss
Difference, and waveform can not be automatically positioned, be specifically comprised the following steps: in magnifying state
According to the suitable velocity of wave of the type set of cable, by action of low-voltage pulse p-wire to test cable by one low pressure of injection
Pulse, pulse encounter impedance mismatch point along cable distribution, and pulse generates reflection, are transmitted back to measurement point device being tested record,
Timing is carried out in action of low-voltage pulse transmitting, △ t is counted as when the reflected impulse of impedance mismatch point is received, pulse traveling wave is propagated
Speed is counted as V, then fault point distance Lx are as follows:
Mismatch the reflection coefficient ρ of point are as follows:
Wherein ZiFor the input impedance of fault point, ZcFor the characteristic impedance of route；
The reflected impulse that will acquire is shown that the initial position of reflected pulse waveform is abort situation, is carried out to waveform
Horizontal scaling obtains high resolution of ranging, carries out close-up；
The distance for beginning with significant change position to impulse waveform by vector operation acquisition test cable starting point, obtains just
Walk the fault distance calculated；
The reflected pulse waveform obtained in above-mentioned steps is kept in, and based on above-mentioned test environment, tests one
Intact cable obtains reflected pulse waveform, and temporary faulty line reflection configuration and intact cable reflection waveform comparison obtain
The similarities and differences in two waveforms will propose at the difference in comparison of wave shape, be obtained at difference by vector operation to cable starting point
Distance, obtains the fault distance of secondary calculating, and takes multiple measurements, the failure of fault distance and primary Calculation to acquisition away from
From averaging, power circuit ground fault location information is obtained according to the trend of cable and fault distance；
By injecting an action of low-voltage pulse, production when pulse travels to impedance mismatch point along test cable to cable in test
Raw reflection, is collected display to the impulse waveform after reflection and calculates fault distance, and in the distortionless premise of waveforms amplitude
Under, reflected impulse is amplified, changes waveforms amplitude by waveform horizontal scaling and obtains high resolution of ranging, to improve reflection arteries and veins
Punching is to the expression at impedance mismatch point, so that calculating, the fault distance obtained is more accurate, reduces and actual fault point
Deviation, to improve the accuracy to fault location.
Embodiment 5
Step 1, inquiry obtains position at the substation of power supply line, using discharging rod that each phase line of cable is abundant over the ground
Electric discharge；
Step 2 connects the plug of action of low-voltage pulse p-wire and the action of low-voltage pulse socket of test device, the two of p-wire
A clamp is connect with two failure phase lines；
Step 3, according to the suitable velocity of wave of the type set of cable, by action of low-voltage pulse p-wire to test cable by note
Enter an action of low-voltage pulse, pulse encounters impedance mismatch point along cable distribution, and pulse generates reflection, is transmitted back to measurement point and is tested trial assembly
Set record；
Step 4 carries out timing in action of low-voltage pulse transmitting, is counted as when the reflected impulse of impedance mismatch point is received
△ t, pulse traveling wave spread speed are counted as V, then fault point distance Lx are as follows:
Mismatch the reflection coefficient ρ of point are as follows:
Wherein ZiFor the input impedance of fault point, ZcFor the characteristic impedance of route；
Step 5, the reflected impulse that will acquire are shown that the initial position of reflected pulse waveform is abort situation, are passed through
Vector operation obtains the distance that test cable starting point begins with significant change position to impulse waveform, obtains the failure of primary Calculation
Distance；
Step 6 keeps in the reflected pulse waveform obtained in above-mentioned steps, and based on above-mentioned test environment, surveys
An intact cable is tried, reflected pulse waveform is obtained, by temporary faulty line reflection configuration and intact cable reflection waveform ratio
Compared with, obtain two waveforms in the similarities and differences, will at the difference in comparison of wave shape propose, by vector operation obtain difference to cable rise
Distance at point, obtains the fault distance of secondary calculating, and take multiple measurements, the fault distance and primary Calculation to acquisition
Fault distance is averaged, and obtains power circuit ground fault location information according to the trend of cable and fault distance；
Further, the reflected impulse of acquisition is also adjusted gain, under the premise of waveforms amplitude is distortionless, to reflection
Pulse amplifying changes waveforms amplitude；
On the basis of above-mentioned, disconnection fault reflected impulse is identical as transmitting pulse polarity, the reflection of short-circuit mix line fault
Pulse is opposite with transmitting pulse polarity；
Further, the present invention can also obtain high resolution of ranging, and waveform is in amplification shape by waveform horizontal scaling
State can not be automatically positioned.
The several points that should finally illustrate are: firstly, in the description of the present application, it should be noted that unless otherwise prescribed and
It limits, term " installation ", " connected ", " connection " shall be understood in a broad sense, can be mechanical connection or electrical connection, be also possible to two
Connection inside element, can be directly connected, and "upper", "lower", "left", "right" etc. are only used for indicating relative positional relationship, when
The absolute position for being described object changes, then relative positional relationship may change；
Secondly: the present invention discloses in embodiment attached drawing, relates only to the structure being related to the embodiment of the present disclosure, other knots
Structure, which can refer to, to be commonly designed, and under not conflict situations, the same embodiment of the present invention and different embodiments be can be combined with each other；
Last: the foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, all in the present invention
Spirit and principle within, any modification, equivalent replacement, improvement and so on, should be included in protection scope of the present invention it
It is interior.
Claims (4)
1. a kind of power circuit Earth design method, which is characterized in that specifically comprise the following steps:
Step 1, inquiry are obtained position at the substation of power supply line, are substantially discharged each phase line of cable over the ground using discharging rod；
Step 2 connects the plug of action of low-voltage pulse p-wire and the action of low-voltage pulse socket of test device, two folders of p-wire
Pincers are connect with two failure phase lines；
Step 3, according to the suitable velocity of wave of the type set of cable, by action of low-voltage pulse p-wire to test cable by injection one
Action of low-voltage pulse, pulse encounter impedance mismatch point along cable distribution, and pulse generates reflection, are transmitted back to measurement point device being tested note
Record；
Step 4 carries out timing in action of low-voltage pulse transmitting, is counted as △ t when the reflected impulse of impedance mismatch point is received,
Pulse traveling wave spread speed is counted as V, then fault point distance Lx are as follows:
Mismatch the reflection coefficient ρ of point are as follows:
Wherein ZiFor the input impedance of fault point, ZcFor the characteristic impedance of route；
Step 5, the reflected impulse that will acquire are shown that the initial position of reflected pulse waveform is abort situation, pass through vector
Algorithm obtains test cable starting point and begins with the distance of significant change position to impulse waveform, obtain the failure of primary Calculation away from
From；
Step 6 keeps in the reflected pulse waveform obtained in above-mentioned steps, and based on above-mentioned test environment, test one
The intact cable of item obtains reflected pulse waveform, and temporary faulty line reflection configuration and intact cable reflection waveform comparison obtain
The similarities and differences in two waveforms are taken, will be proposed at the difference in comparison of wave shape, obtained by vector operation and arrive cable starting point at difference
Distance, obtain the fault distance of secondary calculating, and take multiple measurements, the failure of fault distance and primary Calculation to acquisition
Distance is averaged, and obtains power circuit ground fault location information according to the trend of cable and fault distance.
2. a kind of power circuit Earth design method according to claim 1, it is characterised in that: the reflection arteries and veins of acquisition
Punching is also adjusted gain, under the premise of waveforms amplitude is distortionless, amplifies to reflected impulse, changes waveforms amplitude.
3. a kind of power circuit Earth design method according to claim 1, it is characterised in that: disconnection fault reflection
Pulse is identical as transmitting pulse polarity, and the reflected impulse of short-circuit mix line fault is opposite with transmitting pulse polarity.
4. a kind of power circuit Earth design method according to claim 1, it is characterised in that: pass through waveform level
Scaling, obtains high resolution of ranging, and waveform can not be automatically positioned in magnifying state.
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| CN201910651308.5A CN110244189A (en) | 2019-07-18 | 2019-07-18 | A kind of power circuit Earth design method |
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| CN201910651308.5A CN110244189A (en) | 2019-07-18 | 2019-07-18 | A kind of power circuit Earth design method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161358A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of Earth design method and device |
| CN110687396A (en) * | 2019-09-30 | 2020-01-14 | 山东信通电子股份有限公司 | Method and system for improving cable fault measurement precision |
| CN111077406A (en) * | 2019-11-27 | 2020-04-28 | 西安交通大学 | Direct-current arc fault detection and positioning method based on pulse polarity characteristic distribution spectrogram |
| CN111638470A (en) * | 2020-07-10 | 2020-09-08 | 的卢技术有限公司 | Fault detection method and system for high-voltage connection system in new energy automobile |
| CN111679159A (en) * | 2020-08-14 | 2020-09-18 | 四川大学 | Method for judging impedance change type in frequency domain reflection method |
| CN113740663A (en) * | 2021-08-19 | 2021-12-03 | 成都飞机工业（集团）有限责任公司 | Airplane installed cable fault positioning method based on impedance characteristics |
-
2019
- 2019-07-18 CN CN201910651308.5A patent/CN110244189A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161358A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of Earth design method and device |
| CN110687396A (en) * | 2019-09-30 | 2020-01-14 | 山东信通电子股份有限公司 | Method and system for improving cable fault measurement precision |
| CN110687396B (en) * | 2019-09-30 | 2022-01-28 | 山东信通电子股份有限公司 | Method and system for improving cable fault measurement precision |
| CN111077406A (en) * | 2019-11-27 | 2020-04-28 | 西安交通大学 | Direct-current arc fault detection and positioning method based on pulse polarity characteristic distribution spectrogram |
| CN111638470A (en) * | 2020-07-10 | 2020-09-08 | 的卢技术有限公司 | Fault detection method and system for high-voltage connection system in new energy automobile |
| CN111679159A (en) * | 2020-08-14 | 2020-09-18 | 四川大学 | Method for judging impedance change type in frequency domain reflection method |
| CN111679159B (en) * | 2020-08-14 | 2020-11-24 | 四川大学 | Method for judging impedance change type in frequency domain reflection method |
| CN113740663A (en) * | 2021-08-19 | 2021-12-03 | 成都飞机工业（集团）有限责任公司 | Airplane installed cable fault positioning method based on impedance characteristics |
| CN113740663B (en) * | 2021-08-19 | 2022-05-10 | 成都飞机工业（集团）有限责任公司 | Airplane installed cable fault positioning method based on impedance characteristics |
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