CN106443329A - System and method for detecting fault of DC grounding electrode line - Google Patents
System and method for detecting fault of DC grounding electrode line Download PDFInfo
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- CN106443329A CN106443329A CN201610807006.9A CN201610807006A CN106443329A CN 106443329 A CN106443329 A CN 106443329A CN 201610807006 A CN201610807006 A CN 201610807006A CN 106443329 A CN106443329 A CN 106443329A
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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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- 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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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The invention relates to a system and method for detecting a fault of a DC grounding electrode line, and the system and method achieve the fault discrimination and range finding of the DC grounding electrode line. The system comprises a high-voltage reactor, a high-voltage capacitor, an impedance matching module, an overvoltage protection module, a fault detection device, and a connection cable. The fault detection device can transmit a common mode pulse signal and a differential mode pulse signal, and the common mode pulse signal and the differential mode pulse signal are injected into two conductors of the DC grounding electrode line through the impedance matching module and the high-voltage capacitor. Moreover, a fault reflection traveling wave is detected through the above loop. The high-voltage reactor is disposed at a split part of the grounding electrode line so as to prevent a DC field from affecting a common mode signal traveling wave. The system can reduce the mutual counteracting of differential mode signal traveling waves, and also can enable a differential mode traveling wave method not to be limited by an installation site. The method can improve the amplitude and signal to noise ratio of the traveling wave signals, and can improve the reliability and range finding precision of fault detection of the DC grounding electrode line.
Description
Technical field
The present invention relates to a kind of direct current grounding pole line fault detecting system and method, belong to high voltage dc transmission technology neck
Domain.
Background technology
In DC transmission system, direct current grounding pole line length is likely to be breached more than tens to one hundred kilometer.Ground connection polar curve short circuit
Or during open fault, all straight-flow system can be run and cause potential safety hazard it is therefore desirable to fault is carried out to direct current grounding pole circuit
Detection, including monitoring whether to break down, and carries out fault localization.Because straight-flow system is in direct current monopolar metallic return and double
During very big earthed return balance movement, earthing pole is only used as the potential reference point of DC side, does not have electricity in direct current grounding pole circuit
Stream flows through, now fault signature inconspicuous, is difficult to detect.When direct current monopolar ground return runs, direct current connects straight-flow system
Although the current potential of earth polar circuit can be raised because flowing through load current, due to voltage levvl limited (within usual 15kV),
Less, therefore conventional transmission line travelling wave distance-finding method is not applied for direct current to the travelling wave signal amplitude that short trouble produces
Ground electrode circuit.
The practical approach of direct current grounding pole line fault detection at present mainly has two kinds：One kind is impedance method, injects high frequency
Signal, impedance variation situation during detection fault；Another kind is time domain reflectometry, including common-mode signal traveling wave method and difference mode signal
Traveling wave method, by injected pulse signal, detects pulse signal change reflex time during fault, can monitor fault and carry out event
Barrier range finding.
As described in patent EP0360109, system structure is as shown in figure 1, the method needs in direct current impedance method ultimate principle
Trap is installed at ground electrode circuit two ends, and construction costs is higher, and system is complex, and can only monitor whether to exist fault, no
Method realizes fault localization.
Difference mode signal traveling wave method is addition pulse signal, such as SIEMENS company between two direct current grounding pole circuits
PEMO2000 direct current grounding pole line fault monitoring arrangement use difference mode signal method, system construction drawing is as shown in Figure 2.Difference
Mould travelling wave signal is to propagate between 2 wires of DC earthing polar curve, and therefore decaying, little and velocity of wave is constant, is conducive to time domain method
Fault localization.But because difference mode signal can be cancelled out each other at direct current grounding pole circuit split point, (in Fig. 2, v+ and v- mutually supports
Disappear), therefore there are two big shortcomings in difference mode signal traveling wave method at present：First, the enforcement of the method is limited by direct current place, because
The reason difference mode signal is cancelled out each other, the method requires the distance between signal decanting point and circuit split point sufficiently large (see Fig. 2
Middle a) generally should be greater than 50m, and should increase with the increase of direct current grounding pole line length, DC field may not possess this
The mounting condition of sample；Even if in addition, signal decanting point has a certain distance from split point, but the cancelling out each other still of differential signal
Cannot avoid, lead to useful signal amplitude to substantially reduce, and signal waveform becomes more complicated, is unfavorable for fault localization.
Common-mode signal traveling wave method is to add common mode pulse signal between direct current grounding pole circuit and the earth, and signal is injected
Point no required distance, due to there is not the signal cancellation problem of differential mode method, the amplitude of therefore common-mode signal is larger and waveform is simple,
It is thus advantageous to fault localization.But because this pulse signal can be propagated to earthing pole and DC fields converter valve both direction simultaneously,
Therefore easily affected by the element in converter valve direction and circuit, and the intrinsic harmonic wave of DC fields and transient signal are to injection
Common-mode signal there is also very big interference, and therefore the method is difficult to directly apply at the scene.In addition, common-mode signal need to flow through greatly
Ground, its traveling wave speed is simultaneously non-constant, and signal attenuation is also larger, and this is also the technological difficulties that common-mode signal traveling wave method exists.
Additionally, common-mode signal traveling wave method and difference mode signal traveling wave method respectively have its pluses and minuses, for example common-mode signal is due to amplitude
Greatly, waveform is simple, and the reliability of therefore fault distinguishing is higher, but because signal attenuation is big, velocity of wave is non-constant, therefore range accuracy
Relatively low.But existing system and method are difficult to realize both approaches it is impossible to realize having complementary advantages at present simultaneously.
Content of the invention
The purpose of the present invention is：There is provided a kind of direct current grounding pole line fault detecting system and method, by same set of one
Secondary device and secondary device realize difference mode signal traveling wave method and common-mode signal traveling wave method simultaneously, solve difference mode signal traveling wave method engineering
Implement the problem that limited by direct current place, overcome difference mode signal the to cancel out each other signal amplitude leading to is low, waveform is complicated problem,
Solve the problems, such as that common-mode signal traveling wave method is subject to DC fields converter valve directional element and effect of signals, thus improving DC earthing polar curve
The reliability of road fault detect and range accuracy.
In order to reach above-mentioned purpose, the solution of the present invention is：
A kind of direct current grounding pole line fault detecting system, system includes high pressure equipment part, outdoor low voltage environment division
With indoor low-voltage equipment part, high pressure equipment part includes configuring high voltage reactor on direct current grounding pole circuit and high-tension electricity
Container, outdoor low voltage environment division comprises impedance matching module and double layer screen two core cable, and indoor low-voltage equipment part comprises
Overvoltage protective module, band screen layer two core cable and failure detector；High-voltage capacitor is connected respectively to direct current by wire
Ground electrode circuit and impedance matching module, impedance matching module is connected to overvoltage protective module by double layer screen two core cable,
Overvoltage protective module is connected to failure detector by carrying screen layer two core cable.
As present invention further optimization scheme, the quantity of described high voltage reactor is two, two high pressure reactance
The inductance value of device is identical, respectively exit after the division of direct current grounding pole circuit for the arranged in series；Described high-voltage capacitor
Quantity is two, and the capacitance of two high-voltage capacitors is identical, adjacent with high voltage reactor, and parallel configuration is in DC earthing polar curve
Lu Shang；Ground connection polar curve split point and high-voltage capacitor point in parallel are respectively positioned at the both sides of high voltage reactor.
As present invention further optimization scheme, comprise transformer device inside described impedance matching module and realize resistance
Anti- coupling and potential isolation, transformer device has two groups of coupling coils, and the former limit of two groups of coils, secondary all have a common port, former
Side, secondary are externally all rendered as three port network interfaces, transformer device high-pressure side common end grounding, and another two ends are respectively connecting to two
High-voltage capacitor；Two step down side common ports connect to the internal shield of double layer screen two core cable, and another two ends connect respectively
It is connected to two heart yearns of double layer screen two core cable.
As present invention further optimization scheme, inside described overvoltage protective module, it is provided with three groups of lightning protection devices and one group
Grounding terminal block, the internal shield of double layer screen two core cable and the screen layer with screen layer two core cable are all connected to earth terminal
Son row, three groups of lightning protection devices are attempted by two between cable core and grounding terminal block respectively.
As present invention further optimization scheme, described failure detector comprises signal generator, signal detection
Device and control analysis module, control analysis module control signal generator to send differential mode pulse signal and common mode pulse signal, letter
Number detector is used for gathering differential mode pulse signal and common mode pulse signal, controls analysis module to the difference mode signal of collection and common mode
Signal is analyzed, and realizes fault detect.
6th, a kind of direct current grounding pole circuitry fault detection method it is characterised in that：
Direct current grounding pole line fault detection is carried out using time domain reflectometry, is intercepted by the high-frequency signal of high voltage reactor
Effect improves common mode, the amplitude of differential mode travelling wave signal and signal to noise ratio, is respectively adopted difference mode signal traveling wave method and common-mode signal traveling wave
Method realizes the detection of direct current grounding pole line fault, and difference mode signal traveling wave method is used in combination with common mode signal rows ripple method to improve
The reliability of direct current grounding pole line fault detection and range accuracy.
7th, direct current grounding pole circuitry fault detection method as claimed in claim 6 it is characterised in that：Methods described is also wrapped
Include, using reactance value and the positively related characteristic of signal frequency of reactor, signal frequency is higher, and resistance value is bigger；
Using the high-frequency components in time domain reflectometry collection and signal Analysis, using high voltage reactor, differential mode and common mode are believed
High-frequency signal in number is intercepted.
8th, direct current grounding pole circuitry fault detection method as claimed in claim 6 it is characterised in that：
When failure detector works in differential mode pattern, analysis module control signal generator is controlled to send differential mode pulse
, there is potential difference signal between two heart yearns with screen layer two core cable in signal, this difference mode signal is through double layer screen two core electricity
Cable, impedance matching module and high-voltage capacitor are injected on two wires of direct current grounding pole circuit；
When failure detector works in common mode pattern, analysis module control signal generator is controlled to send common mode pulse
Signal, two heart yearns with screen layer two core cable over the ground between there is potential difference signal, this common-mode signal is through double layer screen two
Core cable, impedance matching module and high-voltage capacitor are injected on two wires of direct current grounding pole circuit；
The reflected traveling wave that above-mentioned difference mode signal or common-mode signal are formed in trouble point is through high-voltage capacitor, impedance matching mould
Block, double layer screen two core cable, the signal detector with screen layer two core cable entrance failure detector, analyze mould by controlling
Block correspondence realizes Differential mode analysis or Common mode analysis.
9th, direct current grounding pole circuitry fault detection method as claimed in claim 7 it is characterised in that：
Described failure detector is according to the model selection arranging individually or simultaneously using differential mode or two kinds of common mode
Fault detection method；
When simultaneously using two methods, the cycle by setting is used alternatingly two methods；Or, using common-mode signal traveling wave
Method, as fault distinguishing main formula method, is used difference mode signal traveling wave method as travelling wave ranging main formula method, uses when main formula method loses efficacy
Another kind of method is as supplement.
Using System and method for of the present invention, it is possible to use it is poor that same set of primary equipment and secondary device are realized simultaneously
Mould signal traveling wave method and common-mode signal traveling wave method.According to the system structure, the decanting point of differential mode pulse signal need not be apart from direct current
More than ground electrode circuit split point 50m, can inject nearby adjacent split point, therefore can improve the engineering of difference mode signal traveling wave method
Adaptability.The high voltage reactor that the system uses can improve the effective breadth that difference mode signal is injected into direct current grounding pole circuit,
The amplitude of fault reflected signal can be improved, the complexity of difference mode signal can be reduced, be conducive to improving difference mode signal traveling wave method
The reliability of fault detect and range accuracy.The system can reduce the element in DC fields converter valve direction and signal to common mode
The impact of distance measuring signal, is conducive to improving the reliability of fault detect and the range accuracy of common-mode signal traveling wave method.This method can
To be implemented in combination with having complementary advantages difference mode signal traveling wave method and common mode signal rows ripple method, thus improving direct current grounding pole line fault
The reliability of detection and range accuracy.
Brief description
Fig. 1 is the direct current grounding pole line fault detecting system structure chart of impedance method；
Fig. 2 is the direct current grounding pole line fault detecting system structure chart of differential mode travelling wave signal method；
Fig. 3 is direct current grounding pole line fault detecting system structure chart according to the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings embodiments of the present invention are further described.
As shown in figure 3, a kind of direct current grounding pole line fault detecting system and method, system include high pressure equipment part,
Outdoor low voltage environment division and indoor low-voltage equipment part, high pressure equipment part includes configuring the height on direct current grounding pole circuit
Pressure reactor 11,12 and high-voltage capacitor 21,22, outdoor low voltage environment division comprises impedance matching module 3 and double layer screen two
Core cable 4, indoor low-voltage equipment part comprises overvoltage protective module 5, band screen layer two core cable 6 and failure detector 7；High
Piezoelectric capsule is connected respectively to direct current grounding pole circuit and impedance matching module by wire, and impedance matching module passes through bilayer screen
Cover two core cable to connect to overvoltage protective module, overvoltage protective module connects to fault detect dress by carrying screen layer two core cable
Put.
High voltage reactor 11, the identical 0.1mH～10mH of 12 inductance value, arranged in series is in the division of direct current grounding pole circuit respectively
Exit afterwards；Described high-voltage capacitor 21, the identical 1nF～100nF of 22 capacitances, adjacent with high voltage reactor, parallel connection is joined
It is placed on direct current grounding pole circuit；Ground connection polar curve split point and high-voltage capacitor point in parallel are located at the two of high voltage reactor respectively
Side, the point in parallel of high-voltage capacitor can adjacent high voltage reactor it is not necessary to space out arrangement with ground connection polar curve split point.
Comprise transformer device inside impedance matching module 3 and realize impedance matching and potential isolation, transformer device has two
Group coupling coil 31,32, the former limit of two groups of coils, secondary all have a common port, and former limit, secondary are externally all rendered as three port nets
Mouthful, transformer device high-pressure side common end grounding, another two ends are respectively connecting to high-voltage capacitor 21,22；Two step down sides
Common port connects to the internal shield of double layer screen two core cable 4, and another two ends are respectively connecting to the two of double layer screen two core cable
Root heart yearn.
It is provided with three groups of lightning protection devices 51 and one group of grounding terminal block 52, double layer screen two core cable 4 inside overvoltage protective module 5
Internal shield and the screen layer with screen layer two core cable 6 be all connected to grounding terminal block, three groups of lightning protection devices are attempted by respectively
Two between cable core and grounding terminal block.
Failure detector 7 comprises signal generator 71, signal detector 72 and controls analysis module 73, controls analysis mould
Block can control signal generator and sends differential mode pulse signal and common mode pulse signal, and signal detector is used for gathering differential mode pulse letter
Number and common mode pulse signal, control analysis module to collection difference mode signal and common-mode signal be analyzed, realize fault detect.
This method carries out direct current grounding pole line fault detection using time domain reflectometry, based on above-mentioned fault detect system
System, improves common mode, the amplitude of differential mode travelling wave signal and signal to noise ratio by the high-frequency signal iris action of high voltage reactor, can distinguish
The detection of direct current grounding pole line fault is realized using difference mode signal traveling wave method and common-mode signal traveling wave method, and can be by difference mode signal row
Ripple method is used in combination reliability and range accuracy to improve the detection of direct current grounding pole line fault with common mode signal rows ripple method.
This method utilizes reactance value and the positively related characteristic of signal frequency of reactor, and signal frequency is higher, and resistance value is got over
Greatly；Time domain reflectometry mainly gathers and the high-frequency components in signal Analysis, and this method utilizes high voltage reactor (11,12) to differential mode
Intercepted with the high-frequency signal in common-mode signal；
Due to the presence of high voltage reactor (11,12), it is injected into the difference mode signal between two wires of direct current grounding pole circuit
Direct current grounding pole circuit can be flowed mostly to because of the interception function of high voltage reactor, the signal returning from trouble point is also because high
Press the interception function of reactor mainly to flow to failure detector through high-voltage capacitor, therefore avoid difference mode signal and pass through to lead
Line split point and cancel out each other, therefore difference mode signal energy loss is much smaller than the situation of high voltage reactor of being not provided with；Further, since
The interception function of high voltage reactor, high-voltage capacitor can adjacent with high voltage reactor be installed it is not necessary to apart from direct current grounding pole circuit
More than split point 50m.Therefore, this method can improve reliability and the range accuracy of the fault detect of difference mode signal traveling wave method, with
The engineering adaptability of Shi Tigao the method.
Due to the presence of high voltage reactor (11,12), the high-frequency interferencing signal from DC fields converter valve direction is intercepted,
Meanwhile, be injected into direct current grounding pole circuit and the earth between common-mode signal also because high voltage reactor interception function and
Flow mostly to direct current grounding pole circuit, therefore common-mode signal energy loss is little, affected by DC fields converter valve directional element
Reduce because of the presence of high voltage reactor.Therefore, this method can improve the reliability of the fault detect of common-mode signal traveling wave method
And range accuracy.
When failure detector works in differential mode pattern, analysis module (73) control signal generator (71) is controlled to send
, there is potential difference signal between two heart yearns with screen layer two core cable 6, this difference mode signal is through bilayer screen in differential mode pulse signal
Cover two core cable 4, impedance matching module 3 and high-voltage capacitor 21,22 to be injected on two wires of direct current grounding pole circuit.
When failure detector works in common mode pattern, analysis module (73) control signal generator (71) is controlled to send
Common mode pulse signal, two heart yearns with screen layer two core cable 6 over the ground between there is potential difference signal, this common-mode signal is through double
Layer shielding two core cable 4, impedance matching module 3 and high-voltage capacitor 21,22 are injected into two wires of direct current grounding pole circuit
On.
The reflected traveling wave that above difference mode signal or common-mode signal are formed in trouble point through high-voltage capacitor 21,22, impedance
Join module 3, double layer screen two core cable 4, the signal detector 72 with screen layer two core cable 6 entrance failure detector, by
Analysis module (73) correspondence is controlled to realize Differential mode analysis or Common mode analysis.
Failure detector can be according to the model selection of setting individually or simultaneously using two kinds of fault detection methods；Simultaneously
During using two methods, really two methods are used alternatingly by certain cycle and rule, replace one-time detection within for example every 2 seconds
Method；When adopting two methods simultaneously, two methods can be used in combination, common-mode signal traveling wave method be used as fault distinguishing
Main formula method, is used difference mode signal traveling wave method as travelling wave ranging main formula method, made alternatively conduct when main formula method loses efficacy
Supplement.
The above, only presently preferred embodiments of the present invention, it is not intended to limit protection scope of the present invention.Any
Those familiar with the art in the technical scope of the disclosure of the present invention, the change or replacement that can readily occur in, all
Should be included within the scope of the present invention.
Claims (9)
1. a kind of direct current grounding pole line fault detecting system it is characterised in that：
System includes high pressure equipment part, outdoor low voltage environment division and indoor low-voltage equipment part, and high pressure equipment part includes
Configure the high voltage reactor on direct current grounding pole circuit and high-voltage capacitor, outdoor low voltage environment division comprises impedance matching mould
Block and double layer screen two core cable, indoor low-voltage equipment part comprises overvoltage protective module, band screen layer two core cable and fault
Detection means；High-voltage capacitor is connected respectively to direct current grounding pole circuit and impedance matching module, impedance matching mould by wire
Block is connected to overvoltage protective module by double layer screen two core cable, and overvoltage protective module passes through to carry screen layer two core cable to connect
To failure detector.
2. direct current grounding pole line fault detecting system as claimed in claim 1 it is characterised in that：
The quantity of described high voltage reactor is two, and the inductance value of two high voltage reactors is identical, and arranged in series is in straight respectively
Exit after stream ground electrode circuit division；The quantity of described high-voltage capacitor is two, the electric capacity of two high-voltage capacitors
Value is identical, and adjacent with high voltage reactor, parallel configuration is on direct current grounding pole circuit；Ground connection polar curve split point and high-voltage capacitor
Point in parallel is located at the both sides of high voltage reactor respectively.
3. direct current grounding pole line fault detecting system as claimed in claim 1 it is characterised in that：
Comprise transformer device inside described impedance matching module and realize impedance matching and potential isolation, transformer device has two
Group coupling coil, the former limit of two groups of coils, secondary all have a common port, and former limit, secondary are externally all rendered as three port network interfaces, become
Depressor assembly high-pressure side common end grounding, another two ends are respectively connecting to two high-voltage capacitors；Two step down side common ports
Connect to the internal shield of double layer screen two core cable, another two ends are respectively connecting to two heart yearns of double layer screen two core cable.
4. direct current grounding pole line fault detecting system as claimed in claim 1 it is characterised in that：
Be provided with three groups of lightning protection devices and one group of grounding terminal block inside described overvoltage protective module, double layer screen two core cable interior
Screen layer and the screen layer with screen layer two core cable are all connected to grounding terminal block, and three groups of lightning protection devices are attempted by two electricity respectively
Between core and grounding terminal block.
5. direct current grounding pole line fault detecting system as claimed in claim 1 it is characterised in that：
Described failure detector comprises signal generator, signal detector (72) and controls analysis module, controls analysis mould
Block control signal generator sends differential mode pulse signal and common mode pulse signal, and signal detector is used for gathering differential mode pulse signal
With common mode pulse signal, control analysis module that the difference mode signal of collection and common-mode signal are analyzed, realize fault detect.
6. a kind of direct current grounding pole circuitry fault detection method it is characterised in that：
Direct current grounding pole line fault detection is carried out using time domain reflectometry, by the high-frequency signal iris action of high voltage reactor
Improve common mode, the amplitude of differential mode travelling wave signal and signal to noise ratio, be respectively adopted difference mode signal traveling wave method and common-mode signal traveling wave method is real
Existing direct current grounding pole line fault detection, and difference mode signal traveling wave method is used in combination with common mode signal rows ripple method to improve direct current
The reliability of ground electrode circuit fault detect and range accuracy.
7. direct current grounding pole circuitry fault detection method as claimed in claim 6 it is characterised in that：Methods described also includes,
Using reactance value and the positively related characteristic of signal frequency of reactor, signal frequency is higher, and resistance value is bigger；
Using the high-frequency components in time domain reflectometry collection and signal Analysis, using high voltage reactor in differential mode and common-mode signal
High-frequency signal intercepted.
8. direct current grounding pole circuitry fault detection method as claimed in claim 6 it is characterised in that：
When failure detector works in differential mode pattern, analysis module control signal generator is controlled to send differential mode pulse letter
Number, there is potential difference signal between two heart yearns with screen layer two core cable, this difference mode signal through double layer screen two core cable,
Impedance matching module and high-voltage capacitor are injected on two wires of direct current grounding pole circuit；
When failure detector works in common mode pattern, analysis module control signal generator is controlled to send common mode pulse letter
Number, two heart yearns with screen layer two core cable over the ground between there is potential difference signal, this common-mode signal is through double layer screen two core
Cable, impedance matching module and high-voltage capacitor are injected on two wires of direct current grounding pole circuit；
The reflected traveling wave that above-mentioned difference mode signal or common-mode signal are formed in trouble point is through high-voltage capacitor, impedance matching module, double
Layer shielding two core cable, the signal detector with screen layer two core cable entrance failure detector, by control analysis module pair
Differential mode analysis or Common mode analysis should be realized.
9. direct current grounding pole circuitry fault detection method as claimed in claim 7 it is characterised in that：
Described failure detector is according to the model selection arranging individually or simultaneously using differential mode or two kinds of faults of common mode
Detection method；
When simultaneously using two methods, the cycle by setting is used alternatingly two methods；Or, made using common-mode signal traveling wave method
For fault distinguishing main formula method, difference mode signal traveling wave method is used as travelling wave ranging main formula method, when main formula method lost efficacy using another
The method of kind is as supplement.
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| CN107391810A (en) * | 2017-06-30 | 2017-11-24 | 中国西电电气股份有限公司 | A kind of method for calculating earthing pole lead monitoring arrangement element transient state rated value |
| CN107391810B (en) * | 2017-06-30 | 2020-06-30 | 中国西电电气股份有限公司 | Method for calculating transient rated value of element of grounding electrode lead monitoring device |
| CN108362981A (en) * | 2018-01-09 | 2018-08-03 | 复旦大学 | A kind of photovoltaic system DC Line Fault arc method for measuring that active/passive detection combines |
| CN108362981B (en) * | 2018-01-09 | 2020-07-28 | 复旦大学 | Active/passive detection combined photovoltaic system direct-current fault arc detection method |
| CN108845219B (en) * | 2018-06-26 | 2019-08-02 | 西南交通大学 | A kind of recognition methods of System for HVDC System Earth Pole line fault |
| CN108845219A (en) * | 2018-06-26 | 2018-11-20 | 西南交通大学 | A kind of recognition methods of System for HVDC System Earth Pole line fault |
| CN109038515A (en) * | 2018-07-09 | 2018-12-18 | 中国电力科学研究院有限公司 | A kind of Hybrid HVDC route traveling-wave protection method and system based on Dual Tree Complex Wavelet variation |
| CN109116167A (en) * | 2018-07-27 | 2019-01-01 | 中国电力科学研究院有限公司 | A kind of cable grounding line monitoring device and method based on coupling coil |
| CN109444670A (en) * | 2018-12-21 | 2019-03-08 | 青岛科汇电气有限公司 | Fault location system and method for grounding electrode line in direct current transmission system |
| CN111562442A (en) * | 2019-02-13 | 2020-08-21 | 国家电网有限公司 | Grounding resistance online fault monitoring system and method |
| CN110165646A (en) * | 2019-04-09 | 2019-08-23 | 山东鲁源电气股份有限公司 | A kind of cable shield electric current bleeder |
| CN112595929A (en) * | 2020-12-09 | 2021-04-02 | 天津大学 | Monopole grounding fault location method suitable for true bipolar flexible direct system |
| CN112595929B (en) * | 2020-12-09 | 2022-08-02 | 天津大学 | Monopole grounding fault location method suitable for true bipolar flexible direct system |
| CN115184718A (en) * | 2022-04-20 | 2022-10-14 | 中国矿业大学 | Time domain analysis-based three-core cable fault positioning method |
| CN115184718B (en) * | 2022-04-20 | 2023-11-14 | 中国矿业大学 | Three-core cable fault positioning method based on time domain analysis |
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