CN106932689A - A kind of power cable fault voltage traveling wave distance-finding method - Google Patents
A kind of power cable fault voltage traveling wave distance-finding method Download PDFInfo
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- CN106932689A CN106932689A CN201511031298.3A CN201511031298A CN106932689A CN 106932689 A CN106932689 A CN 106932689A CN 201511031298 A CN201511031298 A CN 201511031298A CN 106932689 A CN106932689 A CN 106932689A
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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
- G01R31/08—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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- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The invention belongs to power system monitoring field, specifically related to a kind of power cable fault voltage traveling wave distance-finding method, it is characterized in that, by tested cable opposite end loop, intact phase to being tested power cable applies high-voltage pulse signal, failure phase and another voltage traveling wave reflection configuration of intact phase are recorded simultaneously, using first crest or the time difference of trough of failure phase and intact phase traveling wave data, analytical calculation fault distance.The present invention has accuracy higher.Trouble point reflected impulse and sphere gap pulse polarity are conversely, easily distinguish trouble point reflected impulse and sphere gap pulse, while voltage traveling wave method need not increase high-voltage capacitance, cost increases little.
Description
Technical field：
The invention belongs to power system monitoring field, and in particular to a kind of power cable fault voltage traveling wave range finding
Method.
Background technology：
What is applied when being found range to line fault at present is usually pulse current method, and the method is by failure
The failure of cable mutually applies high-voltage pulse signal, makes trouble point disruptive discharge, measures the current traveling wave of failure phase
Data.Due to exist trouble point reflected impulse it is identical with sphere gap pulse polarity the characteristics of, cause trouble point anti-
Penetrate the problem that pulse and sphere gap pulse are not easily distinguishable.
The content of the invention：
It is an object of the present invention to overcome prior art not enough, there is provided one kind can overcome drawbacks described above, letter
Single, convenience, accurate power cable fault voltage traveling wave distance-finding method.
Power cable fault voltage traveling wave distance-finding method provided by the present invention, it is right by tested cable opposite end loop
The intact phase of tested power cable applies high-voltage pulse signal, while recording failure phase and another intact phase
Voltage traveling wave reflection configuration, using first crest or the time of trough of failure phase and intact phase traveling wave data
Difference, analytical calculation fault distance；Specifically include following steps：
(1) voltage sensor respectively, is set in the failure phase and intact phase of tested power cable, by electric power
The short circuit simultaneously of the other end three-phase of cable；
(2), two-way voltage sensor is distinguished the two-way high-speed sampling unit of connection cable failure tester, structure
Into two-way synchronized sampling structure.
(3) high-voltage pulse signal, is applied to another intact phase for not accessing voltage sensor, trouble point is discharged
Puncture；
(4) by the two-way high-speed sampling unit and voltage sensor in cable fault localization instrument, while record
The voltage traveling wave data of failure phase and intact phase；
(5) the voltage traveling wave data for collecting step 4 carry out waveform analysis, according to fault point voltage row
The feature of ripple electric discharge, the time difference △ t that must be out of order mutually with the crest of waveform first of intact phase two or trough,
According to traveling wave spread speed V and tested cable total length L in the cable, fault distance D=L- △ t*V/2 are drawn.
Preferably, cable opposite end is to failure phase in step (3) and to test after the intact phase short circuit of traveling wave simultaneously
Apply high-voltage pulse signal.
The beneficial effects of the invention are as follows：
With accuracy higher.Trouble point reflected impulse and sphere gap pulse polarity are conversely, easily distinguish event
Barrier point reflection pulse and sphere gap pulse, while voltage traveling wave method need not increase high-voltage capacitance, cost increases
Seldom.The present invention is simple and easy to apply, realizes the purpose that test traveling wave data are easier to analysis identification, and it is right to reduce
Tester tests the requirement of experience, improves the efficiency of fault test, shortens power off time, improves power supply
Quality.The voltage traveling wave that trouble point electric discharge is produced, the voltage traveling wave produced with other non-faulting points has phase
Opposite feature, and current traveling wave does not have this feature, overcomes current traveling wave signal and is easily gone by point is mismatched
Wave reflection influences, and causes traveling-wave waveform to be difficult to the problem analyzed.It is expected to realize full automatic power cable fault
The function of range finding.
Brief description of the drawings
Fig. 1 present system structural scheme of mechanism；
Fig. 2 failures and intact phase waveform comparison diagram；
In figure：1st, it is tested cable；2nd, short circuit connecting line；3rd, failure phase fault position；4th, high-voltage signal
Generator；5th, cable fault localization instrument；6th, voltage sensor.
Specific embodiment
As shown in figure 1, a voltage sensor is respectively set in the failure phase and intact phase of tested power cable,
By the short circuit simultaneously of the other end three-phase of power cable；
Two-way voltage sensor is distinguished the two-way high-speed sampling unit of connection cable failure tester, two-way is constituted
Synchronized sampling structure.
Another intact phase to not accessing voltage sensor applies high-voltage pulse signal, makes trouble point discharge breakdown；
By two-way high-speed sampling unit and voltage sensor in cable fault localization instrument, while recording failure phase
With the voltage traveling wave data of intact phase；
The voltage traveling wave data that step 4 is collected carry out waveform analysis, are discharged according to fault point voltage traveling wave
Feature, must be out of order mutually and the crest of waveform first of intact phase two or trough time difference △ t, according to row
Ripple spread speed V and tested cable total length L in the cable, draws fault distance D=L- △ t*V/2.
The degree of reflection of traveling wave can use the reflected voltage (electric current) of the impedance mismatch point for reflecting and incident voltage
The ratio between (electric current) is represented, this ratio is referred to as reflectance factor.The characteristics of voltage traveling wave reflects is traveling wave reflection at short circuit
Coefficient is -1, incident voltage and reflected voltage opposite in phase, and traveling wave reflectance factor is 1, incident voltage at open circuit
It is identical with reflected voltage phase.The reflected impulse and ball that only trouble point electric discharge is produced are drawn according to principles above
The pulse polarity that gap discharge is produced is opposite.And sphere gap discharge pulse and the trouble point electric discharge of current traveling wave method
Pulse polarity is identical, is not easily distinguishable.
Because the reflected impulse produced by the electric discharge of trouble point can produce the easy aliasing of multiple reflections, only collection event all the way
Barrier phase voltage traveling wave is not easily distinguishable trouble point discharge pulse interval.But the reflection produced according to trouble point electric discharge
The pulse polarity contrary principles that pulse and sphere gap electric discharge are produced, it is easy to distinguish first trouble point electric discharge arteries and veins
Punching, therefore using record failure phase and intact phase traveling-wave waveform, the mode being compared, it is easy to obtain simultaneously
The transmission time difference of trouble point discharge pulse is obtained, fault distance is thus calculated.
Claims (3)
1. a kind of power cable fault voltage traveling wave distance-finding method, it is characterized in that, by tested cable opposite end loop,
Intact phase to being tested power cable applies high-voltage pulse signal, while recording failure phase and another intact phase
Voltage traveling wave reflection configuration, using failure phase and intact phase traveling wave data first crest or trough when
Between poor, analytical calculation fault distance；Specifically include following steps：
(1) voltage sensor respectively, is set in the failure phase and intact phase of tested power cable, by electric power
The short circuit simultaneously of the other end three-phase of cable；
(2), two-way voltage sensor is distinguished the two-way high-speed sampling unit of connection cable failure tester, structure
Into two-way synchronized sampling structure.
(3) high-voltage pulse signal, is applied to another intact phase for not accessing voltage sensor, trouble point is discharged
Puncture；
(4) by the two-way high-speed sampling unit and voltage sensor in cable fault localization instrument, while record
The voltage traveling wave data of failure phase and intact phase；
(5) the voltage traveling wave data for collecting step 4 carry out waveform analysis, according to fault point voltage row
The feature of ripple electric discharge, the time difference △ t that must be out of order mutually with the crest of waveform first of intact phase two or trough,
According to traveling wave spread speed V and tested cable total length L in the cable, fault distance D=L- △ t*V/2 are drawn.
2. power cable fault voltage traveling wave distance-finding method according to claim 1, it is characterized in that, institute
Cable opposite end applies high pressure simultaneously to failure phase and after testing the intact phase short circuit of traveling wave in the step of stating (3)
Pulse signal.
3. the device of claim 1 methods described, including tested cable are realized, it is characterized in that, in tested electricity
One end three-phase shortcircuit connection of cable；One voltage sensor is respectively set in the failure phase and intact phase of the other end,
Another mutually intact High-voltage Signal Generator that is connected, voltage sensor connection cable fault locator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511031298.3A CN106932689A (en) | 2015-12-31 | 2015-12-31 | A kind of power cable fault voltage traveling wave distance-finding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511031298.3A CN106932689A (en) | 2015-12-31 | 2015-12-31 | A kind of power cable fault voltage traveling wave distance-finding method |
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| CN106932689A true CN106932689A (en) | 2017-07-07 |
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| CN201511031298.3A Pending CN106932689A (en) | 2015-12-31 | 2015-12-31 | A kind of power cable fault voltage traveling wave distance-finding method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541401A (en) * | 2018-12-29 | 2019-03-29 | 上海仁童电子科技有限公司 | Cable detection method, device and electronic equipment |
| CN109725235A (en) * | 2019-02-13 | 2019-05-07 | 国家电网有限公司 | A kind of flexible direct current power grid metallic return fault detection method |
| CN109932614A (en) * | 2017-12-19 | 2019-06-25 | 中国科学院长春光学精密机械与物理研究所 | A kind of cable fault investigation method and device |
| CN110187234A (en) * | 2019-05-31 | 2019-08-30 | 南方电网科学研究院有限责任公司 | A kind of mixed power transmission line fault distance-finding method |
| CN110286299A (en) * | 2019-07-30 | 2019-09-27 | 南京荣港电气技术有限公司 | A kind of power cable fault monitoring method |
| CN115412163A (en) * | 2022-09-21 | 2022-11-29 | 佛山市冰蓝科技有限公司 | System and method for detecting and positioning breakpoints of field optical cables |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932614A (en) * | 2017-12-19 | 2019-06-25 | 中国科学院长春光学精密机械与物理研究所 | A kind of cable fault investigation method and device |
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| CN109541401B (en) * | 2018-12-29 | 2021-02-02 | 上海仁童电子科技有限公司 | Cable detection method and device and electronic equipment |
| CN109725235A (en) * | 2019-02-13 | 2019-05-07 | 国家电网有限公司 | A kind of flexible direct current power grid metallic return fault detection method |
| CN110187234A (en) * | 2019-05-31 | 2019-08-30 | 南方电网科学研究院有限责任公司 | A kind of mixed power transmission line fault distance-finding method |
| CN110286299A (en) * | 2019-07-30 | 2019-09-27 | 南京荣港电气技术有限公司 | A kind of power cable fault monitoring method |
| CN115412163A (en) * | 2022-09-21 | 2022-11-29 | 佛山市冰蓝科技有限公司 | System and method for detecting and positioning breakpoints of field optical cables |
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Application publication date: 20170707 |