CN108037409A - A kind of DC line fault detection method and device - Google Patents

A kind of DC line fault detection method and device Download PDF

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Publication number
CN108037409A
CN108037409A CN201711030396.4A CN201711030396A CN108037409A CN 108037409 A CN108037409 A CN 108037409A CN 201711030396 A CN201711030396 A CN 201711030396A CN 108037409 A CN108037409 A CN 108037409A
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China
Prior art keywords
line
current
failure component
current failure
energy
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Inventor
王兴国
王江天
郭雅蓉
杜丁香
余越
姜宏丽
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Application filed by State Grid Corp of China SGCC, China Electric Power Research Institute Co Ltd CEPRI filed Critical State Grid Corp of China SGCC
Priority to CN201711030396.4A priority Critical patent/CN108037409A/en
Publication of CN108037409A publication Critical patent/CN108037409A/en
Pending legal-status Critical Current

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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

Abstract

The present invention provides a kind of DC line fault detection method and device, first determine the current failure component of DC line, then the current failure component energy of DC line is calculated, finally judge whether DC line breaks down according to the current failure component energy of DC line, finally realize the fault detect of DC line.The present invention determines the current failure component of DC line by the electric current of DC line at different moments, eliminate influence of the load component to fault detection sensitivity, the fault detect of DC line is only carried out by the current failure component energy of DC line, influenced from voltage transformer disconnection, in addition the present invention realizes the continuous incremental variations of fault signature, the fault detect speed of DC line is not only increased, while improves the sensitivity of fault detect.

Description

A kind of DC line fault detection method and device
Technical field
The present invention relates to technical field of relay protection, and in particular to a kind of DC line fault detection method and device.
Background technology
Flexible direct current power grid is by renewable energy power generation DC online in wide area, there is many advantages：1) make full use of The complementarity of renewable energy power generation, realizes that the extensive of generation of electricity by new energy concentrates access, improves generation of electricity by new energy utilization rate；2) There is no the intrinsic frequency stabilization sex chromosome mosaicism of AC system for DC grid, it is possible to achieve the smooth access of new energy, reduces system Spare capacity；3) it can realize the independent control of active reactive, reduce reactive requirement；4) trend point of fast and flexible can be realized Cloth, accomplishes that the adjusting of wide area power is mutually helped；5) can over long distances, the transmission of the electric energy of large capacity.
Flexible direct current network system is very different with AC system, and the fault current after failure rises rapid.Work as direct current When earth fault occurs for circuit, the capacitance of voltage source converter (Voltage Source Converter, VSC) is first in pole Discharge in the short time trouble point, cause line current to rise rapidly, be mounted with the flexible direct current power grid of dc circuit breaker not It is same as the point-to-point DC transmission system of tradition, soft straight line path by dc circuit breaker quickly cuts off failure after breaking down, this is right The rapidity and sensitivity of fault detect propose very high requirement.
The fault detect of DC line is mainly realized by the curtage situation of change of DC line at present, below it is right The fault detect of DC line is described in detail：
When the electric current of DC line persistently increases and is more than current threshold, it is judged as that DC line breaks down；Or work as When the voltage of DC line reduces and is less than voltage threshold, it is judged as that DC line breaks down.
After DC line breaks down, comprising load component and fault component two parts in the electric current of DC line, when straight Occur during Flow Line heavy load through high resistance ground when minor failure, load component is larger, and fault component is smaller, load component More than fault component, fault signature is masked, the simple detection method for relying on DC current increase cannot be after failure in electric current Fault signature to be extracted, can not accurately detect whether DC line fault occurs, the sensitivity of DC line fault detection is relatively low, into And the molar behavior performance of DC line protection is influenced, DC line fault is detected by direct current using DC voltage descending method Press the influence of transformer disconnection.
The content of the invention
In order to overcome the shortcomings of that the sensitivity of the above-mentioned detection of DC line fault in the prior art is relatively low, the present invention provides one Kind DC line fault detection method and device, first determine the current failure component of DC line according to the electric current of DC line, Then the current failure component energy of DC line is calculated according to the current failure component of DC line, finally judges DC line Current failure component energy whether meet DC line fault criterion, if satisfied, DC line breaks down, protective device is moved Make；Otherwise DC line does not break down, and protective device is failure to actuate, and finally realizes the fault detect of DC line.
In order to realize foregoing invention purpose, the present invention adopts the following technical scheme that：
The present invention provides a kind of DC line fault detection method, including：
The current failure component of DC line is determined according to the electric current of DC line；
The current failure component energy of DC line is calculated according to the current failure component of DC line；
Judge whether the current failure component energy of DC line meets DC line fault criterion, if satisfied, AC line Road is broken down, protective device action；Otherwise DC line does not break down, and protective device is failure to actuate.
The electric current according to DC line determines that the current failure component of DC line includes：
The current failure component of DC line is calculated as follows：
Δ i (t)=i (t)-i (t-TS)
Wherein, Δ i (t) represents the current failure component of t moment DC line, and i (t) represents the electricity of t moment DC line Stream, i (t-TS) represent t-TSThe electric current of moment DC line, TSRepresent sampling time interval.
The i (t) and i (t-TS) obtained by harvester；
The harvester includes DC current sensor；
The DC current sensor is using Zero flux current sensor, optical current mutual inductor or Hall effect sensing Device.
The current failure component energy of DC line is calculated as follows according to the current failure component of DC line：
I=∑ Δ i (t)
Wherein, I represents the current failure component energy of DC line.
The DC line fault criterion such as following formula：
I≥Iset.1
Wherein, Iset.1Represent the first energy threshold.
The DC line fault criterion such as following formula：
Wherein, Iset.2Represent the second energy threshold.
The present invention also provides a kind of DC line fault detection device, including：
Determining module, for determining the current failure component of DC line according to the electric current of DC line；
Computing module, for calculating the current failure component energy of DC line according to the current failure component of DC line Amount；
Whether judgment module, the current failure component energy for judging DC line meet DC line fault criterion, If satisfied, DC line breaks down, protective device action；Otherwise DC line does not break down, and protective device is failure to actuate.
The determining module is specifically used for：
The current failure component of DC line is calculated as follows：
Δ i (t)=i (t)-i (t-TS)
Wherein, Δ i (t) represents the current failure component of t moment DC line, and i (t) represents the electricity of t moment DC line Stream, i (t-TS) represent t-TSThe electric current of moment DC line, TSRepresent sampling time interval.
The determining module includes harvester, and the harvester is used to gather i (t) and i (t-TS), the collection dress Put including DC current sensor；
The DC current sensor is using Zero flux current sensor, optical current mutual inductor or Hall effect sensing Device.
The computing module is specifically used for：
The current failure component energy of DC line is calculated as follows according to the current failure component of DC line：
I=∑ Δ i (t)
Wherein, I represents the current failure component energy of DC line.
The DC line fault criterion such as following formula：
I≥Iset.1
Wherein, Iset.1Represent the first energy threshold.
The DC line fault criterion such as following formula：
Wherein, Iset.2Represent the second energy threshold.
Compared with the immediate prior art, technical solution provided by the invention has the advantages that：
In DC line fault detection method provided by the invention, DC line is first determined according to the electric current of DC line Current failure component, then calculates the current failure component energy of DC line, most according to the current failure component of DC line Judge whether the current failure component energy of DC line meets DC line fault criterion afterwards, if satisfied, DC line occurs Failure, protective device action；Otherwise DC line does not break down, and protective device is failure to actuate, and finally realizes the event of DC line Barrier detection；
DC line fault detection device provided by the invention includes being used to determine AC line according to the electric current of DC line The determining module of the current failure component on road, the electric current event for calculating DC line according to the current failure component of DC line Hinder the computing module of component energy and judge whether DC line is sent out for the current failure component energy according to DC line The judgment module of raw failure, finally realizes the fault detect of DC line；
The electric current event of DC line is determined in technical solution provided by the invention by the electric current of DC line at different moments Hinder component, eliminate influence of the load component to fault detection sensitivity；
The electric current event of DC line is calculated in technical solution provided by the invention by the current failure component of DC line Hinder component energy, and the fault detect of DC line is only carried out by the current failure component energy of DC line, from voltage Transformer disconnection influences；
In technical solution provided by the invention failure is realized by carrying out integration to the current failure component of DC line The continuous incremental variations of feature, not only increase the fault detect speed of DC line, while improve the sensitive of fault detect Degree；
Two kinds of criterions of Fisrt fault detection criteria and the second fault detect criterion are provided in technical scheme, are selected The one i.e. achievable fault detect to DC line is selected, implementation process is simple and reliable.
Brief description of the drawings
Fig. 1 is DC line fault detection method flow chart in the embodiment of the present invention 1；
Fig. 2 is current failure component samples value schematic diagram after DC line breaks down in the embodiment of the present invention；
Fig. 3 is the current failure component energy schematic diagram of DC line in the embodiment of the present invention；
Fig. 4 is DC line fault detection method flow chart in the embodiment of the present invention 2；
Fig. 5 is four end flexible direct current power grid schematic diagram in the embodiment of the present invention 3；
Fig. 6 is that monopole occurs for Kangbao County in the embodiment of the present invention 3-Fengning line midpoint through electric current event during 300 ohm of earth fault Hinder component simulation waveform schematic diagram；
Fig. 7 is that monopole occurs for Kangbao County in the embodiment of the present invention 3-Fengning line midpoint through electric current event during 300 ohm of earth fault Hinder component energy simulation waveform schematic diagram.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment 1
The embodiment of the present invention 1 provides a kind of DC line fault detection method, the DC line fault detection method Particular flow sheet is as shown in Figure 1, detailed process is as follows：
S101：The current failure component of DC line is determined according to the electric current of DC line；
S102：The current failure component energy of DC line is calculated according to the current failure component of the S101 DC lines determined Amount；
S103：Judge whether the current failure component energy for the DC line that S102 is calculated meets the first DC line fault Criterion, if meeting the first DC line fault criterion, shows that DC line breaks down, protective device action；Otherwise show DC line does not break down, and protective device is failure to actuate.
In above-mentioned S101, the detailed process of current failure component of DC line is determined according to the electric current of DC line such as Under：
1) the electric current i (t) and t-T of t moment DC line are gathered by harvesterSElectric current i (the t- of moment DC line TS), wherein TSRepresent sampling time interval.
2) the current failure component of DC line is calculated as follows：
Δ i (t)=i (t)-i (t-TS)
Wherein, Δ i (t) represents the current failure component of t moment DC line, and i (t) represents the electricity of t moment DC line Stream, i (t-TS) represent t-TSThe electric current of moment DC line, TSRepresent sampling time interval.
Current failure component samples value schematic diagram after DC line breaks down as shown in Fig. 2, from figure 2 it can be seen that The current failure component samples value of DC line is 0 before breaking down, and the current failure component of DC line is adopted after breaking down Sample value is more than 0, and constantly increase.
It is above-mentioned 1) in harvester can be DC current sensor, which can use Zero flux Current sensor, optical current mutual inductor or hall effect sensor.
In above-mentioned S102, the current failure of DC line is calculated according to the current failure component of the S101 DC lines determined Component energy detailed process is as follows：
Point-by-point integration is carried out to the current failure component of DC line, you can obtain the current failure component energy of DC line Amount, is formulated as：
I=∑ Δ i (t)
Wherein, I represents the current failure component energy of DC line.
The current failure component energy schematic diagram of DC line is as shown in figure 3, the electric current of DC line is former before breaking down It is 0 to hinder component energy, and the current failure component energy of DC line is more than 0, and constantly increase after breaking down, and pushes the speed aobvious Write be more than break down after the current failure component samples value of DC line push the speed.
In above-mentioned S103, the first DC line fault criterion such as following formula：
I≥Iset.1
Wherein, Iset.1Represent the first energy threshold.
Based on same inventive concept, the embodiment of the present invention 1 additionally provides a kind of DC line fault detection device, these set Similar to DC line fault detection method for the principle solved the problems, such as, DC line fault detection device provided by the invention can Including the first determining module, the first computing module and the first judgment module, to introduce the function of above three module separately below：
First determining module therein, for determining the current failure component of DC line according to the electric current of DC line；
First computing module therein, for calculating the electric current event of DC line according to the current failure component of DC line Hinder component energy；
Whether the first judgment module therein, the current failure component energy for judging DC line meet the first direct current Line fault criterion, if meeting the first DC line fault criterion, DC line breaks down, protective device action；Otherwise it is straight Flow Line does not break down, and protective device is failure to actuate.
The first above-mentioned determining module determines the specific of the current failure component of DC line according to the electric current of DC line Process is as follows：
The current failure component of DC line is calculated as follows：
Δ i (t)=i (t)-i (t-TS)
Wherein, Δ i (t) represents the current failure component of t moment DC line, and i (t) represents the electricity of t moment DC line Stream, i (t-TS) represent t-TSThe electric current of moment DC line, TSRepresent sampling time interval.
The first above-mentioned determining module includes harvester, and harvester is used to gather i (t) and i (t-TS), harvester Can be DC current sensor, DC current sensor can use Zero flux current sensor, optical current mutual inductor or Hall effect sensor.
The first above-mentioned computing module calculates the current failure point of DC line according to the current failure component of DC line The detailed process of energy is as follows：
The current failure component energy of DC line is calculated as follows according to the current failure component of DC line：
I=∑ Δ i (t)
Wherein, I represents the current failure component energy of DC line.
Above-mentioned first judgment module according to the current failure component energy of DC line judge DC line whether failure During the first DC line fault criterion such as following formula for using：
I≥Iset.1
Wherein, Iset.1Represent the first energy threshold.
Embodiment 2
The embodiment of the present invention 2 provides a kind of DC line fault detection method, the DC line fault detection method Particular flow sheet is as shown in figure 4, detailed process is as follows：
S201：The current failure component of DC line is determined according to the electric current of DC line；
S202：The current failure component energy of DC line is calculated according to the current failure component of the S201 DC lines determined Amount；
S203：Judge whether the current failure component energy for the DC line that S202 is calculated meets the second DC line fault Criterion, if meeting the second DC line fault criterion, shows that DC line breaks down, protective device action；Otherwise show DC line does not break down, and protective device is failure to actuate.
In above-mentioned S201, the detailed process of current failure component of DC line is determined according to the electric current of DC line such as Under：
1) the electric current i (t) and t-T of t moment DC line are gathered by harvesterSElectric current i (the t- of moment DC line TS), wherein TSRepresent sampling time interval.
2) the current failure component of DC line is calculated as follows：
Δ i (t)=i (t)-i (t-TS)
Wherein, Δ i (t) represents the current failure component of t moment DC line, and i (t) represents the electricity of t moment DC line Stream, i (t-TS) represent t-TSThe electric current of moment DC line, TSRepresent sampling time interval.
Current failure component samples value schematic diagram after DC line breaks down as shown in Fig. 2, from figure 2 it can be seen that The current failure component samples value of DC line is 0 before breaking down, and the current failure component of DC line is adopted after breaking down Sample value is more than 0, and constantly increase.
It is above-mentioned 1) in harvester can be DC current sensor, which can use Zero flux Current sensor, optical current mutual inductor or hall effect sensor.
In above-mentioned S202, the current failure of DC line is calculated according to the current failure component of the S201 DC lines determined Component energy detailed process is as follows：
Point-by-point integration is carried out to the current failure component of DC line, you can obtain the current failure component energy of DC line Amount, is formulated as：
I=∑ Δ i (t)
Wherein, I represents the current failure component energy of DC line.
The current failure component energy schematic diagram of DC line is as shown in figure 3, the electric current of DC line is former before breaking down It is 0 to hinder component energy, and the current failure component energy of DC line is more than 0, and constantly increase after breaking down, and pushes the speed aobvious Write be more than break down after the current failure component samples value of DC line push the speed.
In above-mentioned S203, the second DC line fault criterion such as following formula：
Wherein, Iset.2Represent the second energy threshold.
Based on same inventive concept, the embodiment of the present invention 2 additionally provides a kind of DC line fault detection device, these set Similar to DC line fault detection method for the principle solved the problems, such as, DC line fault detection device provided by the invention can Including the second determining module, the second computing module and the second judgment module, to introduce the function of above three module separately below：
Second determining module therein, for determining the current failure component of DC line according to the electric current of DC line；
Second computing module therein, for calculating the electric current event of DC line according to the current failure component of DC line Hinder component energy；
Whether the second judgment module therein, the current failure component energy for judging DC line meet the second direct current Line fault criterion, if meeting the second DC line fault criterion, DC line breaks down, protective device action；Otherwise it is straight Flow Line does not break down, and protective device is failure to actuate.
The second above-mentioned determining module determines the specific of the current failure component of DC line according to the electric current of DC line Process is as follows：
The current failure component of DC line is calculated as follows：
Δ i (t)=i (t)-i (t-TS)
Wherein, Δ i (t) represents the current failure component of t moment DC line, and i (t) represents the electricity of t moment DC line Stream, i (t-TS) represent t-TSThe electric current of moment DC line, TSRepresent sampling time interval.
The second above-mentioned determining module includes harvester, and harvester is used to gather i (t) and i (t-TS), harvester Can be DC current sensor, DC current sensor can use Zero flux current sensor, optical current mutual inductor or Hall effect sensor.
The second above-mentioned computing module calculates the current failure point of DC line according to the current failure component of DC line The detailed process of energy is as follows：
The current failure component energy of DC line is calculated as follows according to the current failure component of DC line：
I=∑ Δ i (t)
Wherein, I represents the current failure component energy of DC line.
Above-mentioned second judgment module according to the current failure component energy of DC line judge DC line whether failure During the second DC line fault criterion such as following formula for using：
Wherein, Iset.2Represent the second energy threshold.
Embodiment 3
The embodiment of the present invention 3 illustrates DC line fault detection method by taking four end flexible direct current power grids shown in Fig. 5 as an example Detailed process：
4 AC systems that Kangbao County, Zhangbei County, Fengning, Beijing in Fig. 5 are connected with DC grid respectively, and 4 exchange systems System is connected with corresponding current conversion station, and current conversion station is connected with each other by dc bus and DC line, AC line voltage grade ±500kV。
Monopole occurs to Tu5Zhong Kangbao County-Fengning line midpoint to imitate through current failure component during 300 ohm of earth fault Very, specific simulation waveform schematic diagram is as shown in fig. 6, current failure component is increased in 5ms by 0 after a failure as can be seen from Figure 6 Stablize to holding after 0.8kA greatly.
Monopole occurs to Tu5Zhong Kangbao County-Fengning line midpoint to carry out through current failure component energy during 300 ohm of earth fault Emulation, specific simulation waveform schematic diagram is as shown in fig. 7, current failure component integrated value is held after a failure as can be seen from Figure 7 Continuous increase, and after failure 40kA is increased to by 0 in 5ms, it is seen that the fault signature in Fig. 7 is more notable, in identical definite value situation Under, the fault identification ability that profit carries out current failure component the fault detection method of integration construction is stronger.
For convenience of description, each several part of apparatus described above is divided into various modules with function or unit describes respectively. Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program Product.Therefore, the application can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware Apply the form of example.Moreover, the application can use the computer for wherein including computer usable program code in one or more The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram The combination of flow and/or square frame in journey and/or square frame and flowchart and/or the block diagram.These computer programs can be provided The processors of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices, which produces, to be used in fact The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or The instruction performed on other programmable devices is provided and is used for realization in one flow of flow chart or multiple flows and/or block diagram one The step of function of being specified in a square frame or multiple square frames.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute The those of ordinary skill in category field with reference to above-described embodiment still can to the present invention embodiment modify or Equivalent substitution, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent substitution Within bright claims.

Claims (12)

  1. A kind of 1. DC line fault detection method, it is characterised in that including：
    The current failure component of DC line is determined according to the electric current of DC line；
    The current failure component energy of DC line is calculated according to the current failure component of DC line；
    Judge whether the current failure component energy of DC line meets DC line fault criterion, if satisfied, DC line is sent out Raw failure, protective device action；Otherwise DC line does not break down, and protective device is failure to actuate.
  2. 2. DC line fault detection method according to claim 1, it is characterised in that the electricity according to DC line Stream determines that the current failure component of DC line includes：
    The current failure component of DC line is calculated as follows：
    Δ i (t)=i (t)-i (t-TS)
    Wherein, Δ i (t) represents the current failure component of t moment DC line, and i (t) represents the electric current of t moment DC line, i (t-TS) represent t-TSThe electric current of moment DC line, TSRepresent sampling time interval.
  3. 3. DC line fault detection method according to claim 2, it is characterised in that the i (t) and i (t-TS) pass through Harvester obtains；
    The harvester includes DC current sensor；
    The DC current sensor uses Zero flux current sensor, optical current mutual inductor or hall effect sensor.
  4. 4. DC line fault detection method according to claim 1, it is characterised in that the electricity according to DC line The current failure component energy that fault component calculates DC line is flowed, including：
    The current failure component energy of DC line is calculated as follows：
    I=∑ Δ i (t)
    Wherein, I represents the current failure component energy of DC line, and Δ i (t) represents the current failure point of t moment DC line Amount.
  5. 5. DC line fault detection method according to any one of claims 1 to 4, it is characterised in that the DC line Failure criterion such as following formula：
    I≥Iset.1
    Wherein, Iset.1Represent the first energy threshold, I represents the current failure component energy of DC line.
  6. 6. DC line fault detection method according to any one of claims 1 to 4, it is characterised in that the DC line Failure criterion such as following formula：
    <mrow> <mfrac> <mi>I</mi> <msub> <mi>T</mi> <mi>S</mi> </msub> </mfrac> <mo>&amp;GreaterEqual;</mo> <msub> <mi>I</mi> <mrow> <mi>s</mi> <mi>e</mi> <mi>t</mi> <mn>.2</mn> </mrow> </msub> </mrow>
    Wherein, Iset.2Represent the second energy threshold, I represents the current failure component energy of DC line, TSRepresent the sampling time Interval.
  7. A kind of 7. DC line fault detection device, it is characterised in that including：
    Determining module, for determining the current failure component of DC line according to the electric current of DC line；
    Computing module, for calculating the current failure component energy of DC line according to the current failure component of DC line；
    Whether judgment module, the current failure component energy for judging DC line meet DC line fault criterion, if full Foot, DC line break down, protective device action；Otherwise DC line does not break down, and protective device is failure to actuate.
  8. 8. DC line fault detection device according to claim 7, it is characterised in that the determining module is specifically used In：
    The current failure component of DC line is calculated as follows：
    Δ i (t)=i (t)-i (t-TS)
    Wherein, Δ i (t) represents the current failure component of t moment DC line, and i (t) represents the electric current of t moment DC line, i (t-TS) represent t-TSThe electric current of moment DC line, TSRepresent sampling time interval.
  9. 9. DC line fault detection device according to claim 8, it is characterised in that the determining module includes collection Device, the harvester are used to gather i (t) and i (t-TS), the harvester includes DC current sensor；
    The DC current sensor uses Zero flux current sensor, optical current mutual inductor or hall effect sensor.
  10. 10. DC line fault detection device according to claim 1, it is characterised in that the computing module is specifically used In：
    The current failure component energy of DC line is calculated as follows according to the current failure component of DC line：
    I=∑ Δ i (t)
    Wherein, I represents the current failure component energy of DC line, and Δ i (t) represents the current failure point of t moment DC line Amount.
  11. 11. according to any DC line fault detection device of claim 7 to 10, it is characterised in that the AC line Road failure criterion such as following formula：
    I≥Iset.1
    Wherein, Iset.1Represent the first energy threshold, I represents the current failure component energy of DC line.
  12. 12. according to any DC line fault detection device of claim 7 to 10, it is characterised in that the AC line Road failure criterion such as following formula：
    <mrow> <mfrac> <mi>I</mi> <msub> <mi>T</mi> <mi>S</mi> </msub> </mfrac> <mo>&amp;GreaterEqual;</mo> <msub> <mi>I</mi> <mrow> <mi>s</mi> <mi>e</mi> <mi>t</mi> <mn>.2</mn> </mrow> </msub> </mrow>
    Wherein, Iset.2Represent the second energy threshold, I represents the current failure component energy of DC line, TSRepresent the sampling time Interval.
CN201711030396.4A 2017-10-30 2017-10-30 A kind of DC line fault detection method and device Pending CN108037409A (en)

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Citations (6)

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