CN104330709B - A kind of isolated neutral system singlephase earth fault Section Location - Google Patents
A kind of isolated neutral system singlephase earth fault Section Location Download PDFInfo
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Abstract
The invention discloses a kind of isolated neutral system singlephase earth fault Section Location, gather the synchronous steady zero-sequence current instantaneous value at region two ends on circuit to be measured first, calculate the difference of two stable status zero-sequence current instantaneous values, then by the polarity of difference polarity and two stable status zero-sequence current instantaneous values come localization of faults region.The present invention all can achieve fault zone positioning for when transition resistance in system is larger and the change of circuit length differs, and the required precision to equipment is not high, improves the accuracy of fault zone positioning.
Description
Technical field
The present invention relates to field of relay protection in power, more particularly to a kind of isolated neutral system single-phase earthing
Fault section location method.
Background technology
Power distribution network adopts small current neutral grounding system mostly at present, and wherein, small current neutral grounding system can be divided into neutral point not again
It is grounded, be grounded and high resistance grounding three class through extinguisher.When small current isolated neutral system occurs single-phase earthing event
During barrier, due to not constituting short-circuit loop, earth short circuit current is more much smaller than load current, and fault phase-to-ground voltage reduces, non-event
Hinder biphase phase voltage to raise, but line voltage is still symmetrical, thus do not affect the continuous power supply to user, system can continue
Run a period of time.If but when there is singlephase earth fault, electrical network still longtime running, because of non-faulting two phase-to-ground voltage liter
Height, may cause the weak link of insulation breakdown, be eventually developed to as phase fault, make fault spread, impact user is just
Often power.In addition cause line to line fault for preventing another phase to be grounded again, or even three-phase shortcircuit is it is necessary to limit within a certain period of time
Complete single-phase fault exclusion.
The method providing several fault location in prior art, such as stable status zero-sequence current relative method and " S " are injected
Method etc., but stable status zero-sequence current relative method is very long for faulty line in isolated neutral system, even greater than non-faulting
This situation of circuit, fault location is inaccurate；" S " injection method is subject to transition Resistance Influence big, and fault location is also inaccurate.
Therefore, the accuracy how effectively improving fault zone positioning is that those skilled in the art need solve to ask at present
Topic.
Content of the invention
It is an object of the invention to provide a kind of isolated neutral system singlephase earth fault Section Location, for being
In system, transition resistance is larger and circuit length changes situation about differing and all can achieve fault zone positioning, will to the precision of equipment
Ask not high, improve the accuracy of fault zone positioning.
For solving above-mentioned technical problem, the invention provides a kind of isolated neutral system singlephase earth fault section is fixed
Method for position, including：
Step A1：Choose a test zone on circuit to be measured, in conjunction with the current conditions at described test zone two ends, judge event
Barrier point region, if trouble point is in described test zone, terminates testing process；Otherwise, to determine the trouble point obtaining
Region direction is as measurement direction；
Step B1：Select another test zone, described another test zone be along described measurement direction choose and
The adjacent test zone of the nearly test zone once tested, and using described another test zone as current test zone；
Step C1：In conjunction with the current conditions at described current test zone two ends, failure judgement point region, if trouble point
In described current test zone, then terminate testing process；Otherwise, enter step D1；
Step D1：If described trouble point is in region rightabout with described measurement direction it is determined that trouble point is current
Between the test zone of described test zone and described the last test, if judge to obtain described trouble point with described test
The region of direction equidirectional, then return to step B1, until localization of faults position；
Wherein, the current conditions at described calmodulin binding domain CaM two ends, the process of failure judgement point region is specially：
Gather synchronous steady zero-sequence current instantaneous value i at described region two endsA1、iB1, and calculate iA1-iB1Obtain difference △
iA1B1；
Judge △ iA1B1Polarity, if △ iA1B1<0, then trouble point is in described region；
If △ is iA1B1>0 and iA1<0、iB1<0, then trouble point is in described areas outside and in the region of load side；
If △ is iA1B1>0 and iA1>0、iB1>0, then trouble point described areas outside and near mains side region in,
Wherein, described iA1It is the stable status zero-sequence current instantaneous value near described mains side, described iB1It is near described load
The stable status zero-sequence current instantaneous value of side, when the sense of current points to described load side direction by described mains side, current value is just electricity
When described mains side direction is pointed to by described load side in stream direction, current value is negative.
Preferably, methods described also includes：
When the stable status zero-sequence current instantaneous value collecting on described circuit to be measured be on the occasion of when, then trouble point is not described
On circuit to be measured, select All other routes as circuit to be measured, return to step A1.
Preferably, methods described also includes：
When the stable status zero-sequence current instantaneous value collecting on described circuit to be measured is negative value, then trouble point is treated described
The end of the described load side on survey line road.
Preferably, the device of the synchronous steady zero-sequence current instantaneous value at described pickup area two ends fills for both-end synchronous detecting
Put.
Preferably, when described double-end monitor device detects trouble point, send ground connection warning information.
In order to solve technique scheme, present invention also offers another kind of isolated neutral system singlephase earth fault
Section Location, including：
Step A2：Choose a test zone on circuit to be measured, in conjunction with the current conditions at described test zone two ends, judge event
Barrier point region, if trouble point is in described test zone, terminates testing process；Otherwise, to determine the trouble point obtaining
Region direction is as measurement direction；
Step B2：Select another test zone, described another test zone be along described measurement direction choose and
The adjacent test zone of the nearly test zone once tested, and using described another test zone as current test zone；
Step C2：In conjunction with the current conditions at described current test zone two ends, failure judgement point region, if trouble point
In described current test zone, then terminate testing process；Otherwise, enter step D2；
Step D2：If described trouble point is in region rightabout with described measurement direction it is determined that trouble point is current
Between the test zone of described test zone and described the last test, if judge to obtain described trouble point with described test
The region of direction equidirectional, then return to step B2, until localization of faults position；
Wherein, the current conditions at described calmodulin binding domain CaM two ends, the process of failure judgement point region is specially：
Gather synchronous steady zero-sequence current instantaneous value i at described region two endsA2、iB2, and calculate iB2-iA2Obtain difference △
iB2A2；
Judge △ iB2A2Polarity, if △ iB2A2>0, then trouble point is in described section；
If △ is iB2A2<0 and iA2>0、iB2>0, then trouble point is in described areas outside and in the region of mains side；
If △ is iB2A2<0 and iA2<0、iB2<0, then trouble point described areas outside and near load side region in,
Wherein, described iA2It is the stable status zero-sequence current instantaneous value near described mains side, described iB2It is near described load
The stable status zero-sequence current instantaneous value of side, when the sense of current points to described load side direction by described mains side, current value is just electricity
When described mains side direction is pointed to by described load side in stream direction, current value is negative.
Preferably, methods described also includes：
When the stable status zero-sequence current instantaneous value collecting on described circuit to be measured be on the occasion of when, then trouble point is not described
On circuit to be measured, select All other routes as circuit to be measured, return to step A2.
Preferably, methods described also includes：
When the stable status zero-sequence current instantaneous value collecting on described circuit to be measured is negative value, then trouble point is treated described
The end of the described load side on survey line road.
Preferably, the device of the synchronous steady zero-sequence current instantaneous value at described pickup area two ends fills for both-end synchronous detecting
Put.
Preferably, when described double-end monitor device detects trouble point, send ground connection warning information.
Isolated neutral system singlephase earth fault Section Location different from the past, one kind that the present invention provides
Isolated neutral system singlephase earth fault Section Location, gathers the synchronization at a certain region two ends on circuit to be measured first
Stable status zero-sequence current instantaneous value, calculates the difference of two stable status zero-sequence current instantaneous values, more steady by difference polarity and two
The polarity of state zero-sequence current instantaneous value comes localization of faults region, and the present invention is for transition resistance in system is larger and line
The situation that road length change differs all can achieve fault zone positioning, and the required precision to equipment is not high, improves fault zone
The accuracy of positioning.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to institute in prior art and embodiment
Need use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only the present invention some enforcement
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also obtain according to these accompanying drawings
Obtain other accompanying drawings.
A kind of process of isolated neutral system singlephase earth fault Section Location that Fig. 1 provides for the present invention
Flow chart；
The current conditions at the calmodulin binding domain CaM two ends that Fig. 2 provides for the present invention, the stream of the process of failure judgement point region
Cheng Tu；
The process of another kind of isolated neutral system singlephase earth fault Section Location that Fig. 3 provides for the present invention
Flow chart；
The trouble point that Fig. 4 provides for the present invention in the zone between time domain two ends electric current flow to schematic diagram；
Fig. 5 shows for outer in test zone and near mains side time domain two ends electric current the flow direction in trouble point that the present invention provides
It is intended to；
Fig. 6 shows for outer in test zone and near load side time domain two ends electric current the flow direction in trouble point that the present invention provides
It is intended to；
The current conditions at the calmodulin binding domain CaM two ends that Fig. 7 provides for the present invention, another mistake of failure judgement point region
The flow chart of journey.
Specific embodiment
The core of the present invention is to provide a kind of isolated neutral system singlephase earth fault Section Location, for being
In system, transition resistance is larger and circuit length changes situation about differing and all can achieve fault zone positioning, will to the precision of equipment
Ask not high, improve the accuracy of fault zone positioning.
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment being obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
Embodiment one
Refer to Fig. 1, a kind of isolated neutral system singlephase earth fault section positioning side that Fig. 1 provides for the present invention
The flow chart of the process of method, the method includes：
Step s101：Choose a test zone on circuit to be measured；
It is understood that selecting a circuit first as circuit to be measured, and a test section is selected on circuit to be measured
Domain, the selection of the test zone on circuit to be measured and circuit here can be important area in important line or
Randomly select from a plurality of circuit, here is not particularly limited.
In addition, when test zone mentioned here refers to double-end monitor device collection two ends synchronous steady zero-sequence current,
Region between two ends.It should be noted that double-end monitor device here refers to be capable of synchronous acquisition region two ends
The device of stable status zero-sequence current.
Step s102：The current conditions at binding test region two ends, failure judgement point region, if trouble point is in test
In region, then enter step s108；Otherwise, enter step s103；
It is understood that after collecting the synchronous steady zero-sequence current at test zone two ends, analyzed area two ends same
The situation of step stable status zero-sequence current, the region that failure judgement point is located.
Step s103:To determine the trouble point region direction obtaining as measurement direction；
It is understood that when judge obtain trouble point in test zone when, terminate testing process, when judge obtain therefore
Barrier point outside test zone and near mains side when, then using test zone point to mains side direction as measurement direction；When
Judge obtain trouble point outside test zone and near load side when, then using test zone point to load side direction as survey
Examination direction.
Step s104：Select another test zone, another test zone is choosing along measurement direction and the last
The adjacent test zone of test zone of test, and using another test zone as current test zone；
It is understood that on the basis of previous step, when measurement direction points to mains side for test zone, then will
Adjacent with the test zone of the last test, test zone near mains side elects current test zone as, proceeds
Localization of fault；When measurement direction points to load side for test zone, then will be adjacent with the test zone of the last test
, elect current test zone as near the test zone of load side, proceed localization of fault.
Step s105：In conjunction with the current conditions at current test zone two ends, failure judgement point region, if trouble point exists
In current test zone, then enter step s108；Otherwise, enter step s106；
It is understood that after collecting the synchronous steady zero-sequence current at test zone two ends, analyzing current test zone
The situation of the synchronous steady zero-sequence current at two ends, the region that failure judgement point is located.
Step s106：Whether failure judgement point is in region rightabout with measurement direction, if it is, entering step
s107；Otherwise, return to step s104；
It is understood that when judging to obtain trouble point in the region contrary with measurement direction, then judging that trouble point exists
Between the test zone of current test zone and the last test；When judge obtain trouble point with measurement direction identical area
During domain, then return to step s104, until localization of faults position.
Step s107:The localization of faults is between the test zone of current test zone and the last test；
Step s108:Terminate testing process.
Refer to Fig. 2, the current conditions at the calmodulin binding domain CaM two ends that Fig. 2 provides for the present invention, failure judgement point region
Process flow chart, this process is：
Step s201：Synchronous steady zero-sequence current instantaneous value i at pickup area two endsA1、iB1, and calculate iA1-iB1Differed from
Value △ iA1B1；
It is understood that synchronous steady zero-sequence current instantaneous value i hereA1And iB1Synchronization refer to that both-end is synchronously examined
Survey the electric current at the region two ends that device synchronization collects.
Step s202：Judge △ iA1B1Polarity, if △ iA1B1<0, then enter step s205, otherwise enter step s203；
If it is understood that △ iA1B1<0, then only have a kind of uniquely situation, i.e. iA1>0, iB1<0, then trouble point is described
In region.
Step s203：Judge iA1>0、iB1>Whether 0 all set up, and if so, then enters step s207, if it is not, then entering step
s204；
It is understood that △ iA1B1>0 and iA1>0、iB1>0 establishment, then explanation trouble point is in areas outside and near power supply
In the region of side.
Step s204：Judge iA1<0、iB1<Whether 0 all set up, and if so, then enters step s206；
It is understood that △ iA1B1>0 and iA1<0、iB1<0 establishment, then explanation trouble point is in areas outside and near load
In the region of side.
Step s205：Trouble point is in region；
Step s206：Trouble point is in areas outside and in the region of load side；
Step s207：Trouble point is in areas outside and in the region of mains side；
Wherein, iA1It is the stable status zero-sequence current instantaneous value near mains side, iB1It is the stable status zero-sequence current near load side
Instantaneous value, when the sense of current points to load side direction by mains side, current value is that just the sense of current points to mains side by load side
During direction, current value is negative.
Isolated neutral system singlephase earth fault Section Location different from the past, one kind that the present invention provides
Isolated neutral system singlephase earth fault Section Location, gathers the synchronization at a certain region two ends on circuit to be measured first
Stable status zero-sequence current instantaneous value, calculates the difference of two stable status zero-sequence current instantaneous values, more steady by difference polarity and two
The polarity of state zero-sequence current instantaneous value comes localization of faults region, and the present invention is for transition resistance in system is larger and line
The situation that road length change differs all can achieve fault zone positioning, and the required precision to equipment is not high, improves fault zone
The accuracy of positioning.
Embodiment two
Refer to Fig. 3, another kind of isolated neutral system singlephase earth fault section positioning that Fig. 3 provides for the present invention
The flow chart of the process of method, the method also includes on the basis of the method that embodiment one is provided：
Step s307：Judge all to test whether to be completed, if it is, entering step step s308；Otherwise enter
Step s304；
Step s308：Judge the stable status zero-sequence current instantaneous value collecting on circuit to be measured whether be on the occasion of, if it is,
Then enter step s309；If it is not, then entering step s310；
It is understood that first determining whether all to test whether to finish, if it is not, then return to step s304 proceeds event
Barrier diagnosis；If it is, judging whether the stable status zero-sequence current instantaneous value collecting on circuit to be measured is on the occasion of if all again
It is on the occasion of then explanation trouble point, not on circuit to be measured, selects All other routes as circuit to be measured, and return to step s301, such as
Fruit inequality is on the occasion of then entrance step s310.
Step s309：Select All other routes as circuit to be measured, return to step s301；
It is understood that when judge obtain collecting on circuit to be measured stable status zero-sequence current instantaneous value be not on the occasion of
When, then judge whether the stable status zero-sequence current instantaneous value collecting on circuit to be measured is negative value again, if it is, explanation fault
The end of the load side in circuit to be measured for the point.
Step s310：Judge whether the stable status zero-sequence current instantaneous value collecting on circuit to be measured is negative value, if it is,
Then enter step s311；
Step s311：The end of the load side in circuit to be measured for the trouble point, enters step s313.
Further, the device of the synchronous steady zero-sequence current instantaneous value at pickup area two ends fills for both-end synchronous detecting
Put.
It is understood that being not limited in both-end sync detection device here, it is capable of the detection of the object of the invention
Device is all within protection scope of the present invention.
Further, when double-end monitor device detects trouble point, send ground connection warning information.
It is understood that ground connection warning information here can send audible alert or instruction for double-end monitor device
Lamp alert, specifically which kind of or which plant form ground connection warning information here be not particularly limited, enable the object of the invention
Ground connection warning information all within protection scope of the present invention.
Another kind of isolated neutral system singlephase earth fault Section Location that the present invention provides, in upper one enforcement
Also add on the basis of the method that provided of example when the stable status zero-sequence current instantaneous value collecting on circuit to be measured be on the occasion of
When, then trouble point, not on circuit to be measured, selects All other routes to proceed trouble point zone location as circuit to be measured, until
Localization of faults position, when the stable status zero-sequence current instantaneous value collecting on circuit to be measured is negative value, then trouble point is being treated
The end of the described load side on survey line road.In addition also add the dress of the synchronous steady zero-sequence current instantaneous value at pickup area two ends
It is set to both-end sync detection device, when double-end monitor device detects trouble point, send ground connection warning information, improve further
The accuracy of fault zone positioning.
The small current singlephase earth fault area positioning method being provided in conjunction with above-described embodiment, this specification gives
Trouble point in zones of different electric current flow to schematic diagram, wherein, refer to Fig. 4, Fig. 5, Fig. 6, wherein, Fig. 4 carries for the present invention
For trouble point in the zone between time domain two ends electric current flow to schematic diagram, the trouble point that Fig. 5 provides for the present invention is in test
Flow to schematic diagram outside region and near mains side time domain two ends electric currents, the trouble point that Fig. 6 provides for the present invention is in test section
Overseas and flow to schematic diagram near load side time domain two ends electric currents；
Wherein, 3 in figures all have N bar circuit, circuit 11 respectively to be measured to All other routes 1N.R0For trouble point and ground
Between short-circuit resistance, iC0For the capacitance current between trouble point and ground, as both-end synchronous steady zero-sequence current iA1、iB1Flow direction
When identical, because in iA1And iB1Between iC0Shunting action so that iA1And iB1Numerically.
Embodiment three
Present invention also offers another kind of isolated neutral system singlephase earth fault Section Location.
Because the principle of this method is identical with the principle of the method that above-described embodiment one is provided, here highlight with upper
State method difference, unique difference is the current conditions at calmodulin binding domain CaM two ends, the tool of failure judgement point region
Body process is different, refer to Fig. 7, the current conditions at the calmodulin binding domain CaM two ends that Fig. 7 provides for the present invention, failure judgement point location
The flow chart of another process in domain, this process is：
Step s401：Gather synchronous steady zero-sequence current instantaneous value i at described region two endsA2、iB2, and calculate iB2-iA2?
To difference △ iB2A2；
Step s402：Judge △ iB2A2Polarity, if △ iB2A2>0, then enter step s405, otherwise, enter step s403；
If it is understood that △ iA2B2>0, then only uniquely a kind of situation is iA2<0, iB2>0, then trouble point is described
In region.
Step s403：Judge iA2>0、iB2>Whether 0 all set up, and if so, then enters step s407, if it is not, then entering step
s404；
It is understood that △ iA2B2<0 and iA2>0、iB2>0 establishment, then explanation trouble point is in areas outside and near power supply
In the region of side.
Step s404：Judge iA2<0、iB2<Whether 0 all set up, then be, then enter step s406；
It is understood that △ iA2B2<0 and iA2<0、iB2<0 establishment, then explanation trouble point is in areas outside and near load
In the region of side.
Step s405：Trouble point is in region；
Step s406：Trouble point is in areas outside and in the region of load side；
Step s407：Trouble point is in areas outside and in the region of mains side；
Wherein, iA2It is the stable status zero-sequence current instantaneous value near mains side, iB2It is the stable status zero-sequence current near load side
Instantaneous value, when the sense of current points to load side direction by mains side, current value is that just the sense of current points to mains side by load side
During direction, current value is negative.
Because embodiment three principle that this method is provided is identical with embodiment one, therefore other steps of embodiment three
Will not be described here, correlation step refer to embodiment one.
Example IV
Present invention also offers another kind of isolated neutral system singlephase earth fault Section Location.
The present embodiment and embodiment two are except the current conditions at calmodulin binding domain CaM two ends, the tool of failure judgement point region
Body process is different outer, other step all sames, and because this unique difference in embodiment three it has been described that, here is no longer
Repeat, therefore, the correlation step of example IV refer to real-time example two and embodiment three.
In this specification, each embodiment is described by the way of going forward one by one, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Professional further appreciates that, in conjunction with the unit of each example of the embodiments described herein description
And algorithm steps, can with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate hardware and
The interchangeability of software, generally describes composition and the step of each example in the above description according to function.These
Function to be executed with hardware or software mode actually, the application-specific depending on technical scheme and design constraint.Specialty
Technical staff can use different methods to each specific application realize described function, but this realization should
Think beyond the scope of this invention.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple modifications to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase one
The scope the widest causing.
Claims (5)
1. a kind of isolated neutral system singlephase earth fault area positioning method is it is characterised in that include：
Step A1：Choose a test zone on circuit to be measured, in conjunction with the current conditions at described test zone two ends, failure judgement point
Region, if testing process, in described test zone, is terminated in trouble point；Otherwise, it is located with determining the trouble point obtaining
Region direction is as measurement direction；
Step B1：Select another test zone, described another test zone be along described measurement direction choose and nearest one
The adjacent test zone of the test zone of secondary test, and using described another test zone as current test zone；
Step C1：In conjunction with the current conditions at described current test zone two ends, failure judgement point region, if trouble point is in institute
State in current test zone, then terminate testing process；Otherwise, enter step D1；
Step D1：If described trouble point is in region rightabout with described measurement direction it is determined that trouble point is in presently described survey
Between the test zone of examination region and described the last test, if judge to obtain described trouble point with described measurement direction phase
Equidirectional region, then return to step B1, until localization of faults position；
Wherein, the current conditions at described calmodulin binding domain CaM two ends, the process of failure judgement point region is specially：
Gather synchronous steady zero-sequence current instantaneous value i at described region two endsA1、iB1, and calculate iA1-iB1Obtain difference △ iA1B1；
Judge △ iA1B1Polarity, if △ iA1B1<0, then trouble point is in described region；
If △ is iA1B1>0 and iA1<0、iB1<0, then trouble point is in described areas outside and in the region of load side；
If △ is iA1B1>0 and iA1>0、iB1>0, then trouble point described areas outside and near mains side region in,
Wherein, described iA1It is the stable status zero-sequence current instantaneous value near described mains side, described iB1It is near described load side
Stable status zero-sequence current instantaneous value, when the sense of current points to described load side direction by described mains side, current value is just electric current side
To when pointing to described mains side direction by described load side, current value is negative.
2. fault zone as claimed in claim 1 localization method is it is characterised in that methods described also includes：
When the stable status zero-sequence current instantaneous value collecting on described circuit to be measured be on the occasion of when, then trouble point is not described to be measured
On circuit, select All other routes as circuit to be measured, return to step A1.
3. fault zone as claimed in claim 1 localization method is it is characterised in that methods described also includes：
When the stable status zero-sequence current instantaneous value collecting on described circuit to be measured is negative value, then survey line is treated described in trouble point
The end of the described load side on road.
4. fault zone as claimed in claim 1 localization method is it is characterised in that the synchronous steady at described pickup area two ends
The device of zero-sequence current instantaneous value is both-end sync detection device.
5. fault zone as claimed in claim 4 localization method it is characterised in that detect when described double-end monitor device therefore
During barrier point, send ground connection warning information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410712063.XA CN104330709B (en) | 2014-11-28 | 2014-11-28 | A kind of isolated neutral system singlephase earth fault Section Location |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410712063.XA CN104330709B (en) | 2014-11-28 | 2014-11-28 | A kind of isolated neutral system singlephase earth fault Section Location |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104330709A CN104330709A (en) | 2015-02-04 |
| CN104330709B true CN104330709B (en) | 2017-03-01 |
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| CN114814493B (en) * | 2022-04-22 | 2022-12-20 | 华北电力大学 | Four-segment type cable partial discharge source double-end monitoring and positioning method |
| CN115575857B (en) * | 2022-12-08 | 2023-04-28 | 江西广凯新能源股份有限公司 | Emergency protection method and device for high-voltage wire breakage |
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