CN105301442B - Fault detector singlephase earth fault based on worst principle determines practical method - Google Patents
Fault detector singlephase earth fault based on worst principle determines practical method Download PDFInfo
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Abstract
The present invention provides a kind of fault detector singlephase earth fault judgement practical method based on worst principle, include the following steps: 1, determine power distribution network minimum fault verification region, and determines that fault detector singlephase earth fault determines mathematical model according to the power distribution network minimum fault verification region；2, mathematical model is determined according to the fault detector singlephase earth fault and is based on worst principle, determine the wrong report of singlephase earth fault signal and fail to report identifiability principle；3, after determining that identifiability principle amendment singlephase earth fault signal is reported and failed to report to mathematical model and the singlephase earth fault signal by mistake according to the fault detector singlephase earth fault, singlephase earth fault decision problem is converted to the logical operation of the minimum each equipment room in fault verification region.The present invention solves the problems, such as in Practical that singlephase earth fault signal such as frequently fails to report and report by mistake at the non-fault verification perfected under information to a certain extent, and live practical application effect is good, preferable to meet live actual demand.
Description
Technical field
The present invention relates to mining area distribution network failure indicator singlephase earth faults to determine field, and specifically one kind is based on
The fault detector singlephase earth fault of worst principle determines practical method.
Background technique
With the development of economy, demand of the people to power supply reliability is continuously improved.Shorten power off time, is to improve power supply
The important indicator of reliability and power supply quality.
Fault location time is the important component of power off time, and effectively reducing fault location time is when shortening to have a power failure
Between important means.Especially in mining area and tunnel, hazardous gas concentration is high, and spark caused by short circuit or ground fault will
Lead to catastrophic consequence, so failure quickly determines and is isolated particularly important.Fault detector is as FLU Fault Location Unit
Small in size with its, price is low, all has the features such as preferable polarization extensive in the power distribution network of mining area short circuit and ground fault
Using.
In practical applications, singlephase earth fault accounts for institute faulty 80% or more, effectively identification and judgement single-phase earthing
Failure determines that fault section has important practical significance.But singlephase earth fault occurs frequently in practical applications, and failure is believed
Number viability is poor, fault misdescription and fails to report situation and takes place frequently.So the non-fault detector localization method tool perfected under information of research
It is significant.
Summary of the invention
It is an object of the invention to solve mining area distribution network failure indicator singlephase earth fault decision problem, in conjunction with distribution
Net feature provides a kind of fault detector singlephase earth fault judgement practical method based on worst principle.
The present invention is implemented as follows:
A kind of fault detector singlephase earth fault judgement practical method based on worst principle, includes the following steps:
Step 1 determines power distribution network minimum fault verification region, and is determined according to the power distribution network minimum fault verification region
Fault detector singlephase earth fault determines mathematical model；
Step 2 determines mathematical model according to the fault detector singlephase earth fault and is based on worst principle, determines single
Identifiability principle is reported and failed to report to phase earth-fault signal by mistake；
Step 3 determines that mathematical model and the singlephase earth fault are believed according to the fault detector singlephase earth fault
Number report and fail to report the singlephase earth fault signal sent on identifiability principle identification of defective indicator by mistake, by singlephase earth fault signal into
After row amendment, it converts singlephase earth fault decision problem to the logical operation of the minimum each equipment room in fault verification region, according to
Logical operation formula determines the whether faulty indicator singlephase earth fault in the minimum fault verification region and occurs.
Further, determine that fault detector singlephase earth fault determines that mathematical model is specific as follows in the step 1:
The closed set being made of fault detector and feeder line section is known as fault verification region, if a fault verification
All endpoints in region are all fault detector and are all T contacts without interior point or all interior points, then claim the fault verification
Region is minimum fault verification region；
It flows through single-phase earth fault current and flows into the fault detector in minimum fault verification region and be known as the minimum failure
Determinating area enters domain fault detector, and what the singlephase earth fault signal sent thereon was known as the minimum fault verification region enters domain
Singlephase earth fault signal；Flow through single-phase earth fault current and flow out minimum fault verification region fault detector be known as should
Minimum fault verification region goes out domain fault detector, and the fault-signal sent thereon is known as the domain out in the minimum fault verification region
Singlephase earth fault signal.
Further, it is reported by mistake in the step 2 and to fail to report identifiability principle specific as follows:
When singlephase earth fault occurs, and when fault detector fails to report singlephase earth fault signal, decision principle are as follows:
Principle 1: when a phase voltage bust in feeder line, another two-phase voltage jumps, and the faulty finger of fault detector downstream institute
Show that then the fault detector reports singlephase earth fault signal when sending singlephase earth fault signal on device at least 1；
When not occurring singlephase earth fault, and when fault detector wrong report singlephase earth fault signal, decision principle are as follows:
Principle 2: when none phase voltage bust in feeder line, another two-phase voltage jumps situation, and send on fault detector single-phase
When earth-fault signal, then the fault detector does not report singlephase earth fault signal.
Further, minimum fault verification region is converted by singlephase earth fault decision problem in the step 3 respectively to set
Logical operation between standby, specific as follows:
The basis that singlephase earth fault determines is minimum fault verification region, and fault verification criterion is as follows:
Criterion 1: if the domain singlephase earth fault signal that enters in the minimum fault verification region exists, and the minimum failure
The domain singlephase earth fault signal that goes out of determinating area is not present, then there is singlephase earth fault in the minimum fault verification region；
Criterion 2: if the domain singlephase earth fault signal that enters in the minimum fault verification region exists, and the minimum failure
There is also then the minimum fault verification region occurs the domain singlephase earth fault signal that goes out of determinating area without singlephase earth fault；
If AR indicates that a minimum fault verification area fault logical value, logical value indicate singlephase earth fault for 1
In the minimum fault verification region, logical value is that 0 expression singlephase earth fault does not occur in the minimum fault verification region,
Logic calculation expression formula are as follows:
" && " is logic and operation；What Fin indicated the minimum fault verification region enters domain singlephase earth fault signal logic
Value, logical value are that the domain singlephase earth fault signal that enters in the 1 expression minimum fault verification region exists, and logical value is 0 table
Show that the domain singlephase earth fault signal that enters in the minimum fault verification region is not present；It is the logical not operation of GFout,
GFout indicates the singlephase earth fault signal logic value for domain fault detector group in the minimum fault verification region, logic
Value indicates that the singlephase earth fault signal for domain fault detector group in the minimum fault verification region exists for 1, logical value
The singlephase earth fault signal for going out domain fault detector group for the 0 expression minimum fault verification region is not present, specifically:
GFout={ Fout1||Fout2||…||Foutn}
" | | " it is logic or operation；FoutnIndicate the single-phase earthing for domain fault detector in minimum fault verification region
Fault-signal logical value, logical value are the domain fault detector out in the 0 expression minimum fault verification region without single-phase earthing event
Hindering signal, logical value is that going out on the fault detector of domain for the 1 expression minimum fault verification region send singlephase earth fault signal,
Wherein n is the domain fault detector number out in the minimum fault verification region, if the value that n is 0, GFout is 0.
The present invention has the advantage that present invention determine that the concept in power distribution network minimum fault verification region, and based on matching
Power grid minimum fault verification region has determined that fault detector singlephase earth fault determines mathematical model；Based on worst principle, really
Singlephase earth fault signal recognition principle and method are determined, have solved singlephase earth fault signal to a certain extent and fail to report and report by mistake
Etc. the non-fault verification problem perfected under information state；Logic-based operation method converts singlephase earth fault decision problem
For the logical operation of the minimum each equipment room in fault verification region, and propose unified calculation method and formula；The present invention establishes
A kind of fault detector singlephase earth fault based on worst principle determines practical method, solves mine to a certain extent
Singlephase earth fault signal such as frequently fails to report and reports by mistake at the non-fault verification problem perfected under information in area's Practical, and scene is real
Border application effect is good, can preferably meet live actual demand.
Detailed description of the invention
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is typical power distribution network figure.
Specific embodiment
The present invention will be described in detail below:
A kind of fault detector singlephase earth fault based on worst principle of the invention determines practical method, this method
Include the following steps:
Step 1 determines power distribution network minimum fault verification region, and true according to the described power distribution network minimum fault verification region
Determine fault detector singlephase earth fault and determines mathematical model；It is specific as follows:
The closed set being made of fault detector and feeder line section is known as fault verification region, if a fault verification
All endpoints in region are all fault detector and are all T contacts without interior point or all interior points, then claim the fault verification
Region is minimum fault verification region；
It flows through single-phase earth fault current and flows into the fault detector in minimum fault verification region and be known as the minimum failure
Determinating area enters domain fault detector, and what the singlephase earth fault signal sent thereon was known as the minimum fault verification region enters domain
Singlephase earth fault signal；Flow through single-phase earth fault current and flow out minimum fault verification region fault detector be known as should
Minimum fault verification region goes out domain fault detector, and the fault-signal sent thereon is known as the domain out in the minimum fault verification region
Singlephase earth fault signal；
Step 2 determines mathematical model according to the fault detector singlephase earth fault and is based on worst principle, determines single
Phase earth-fault signal is reported by mistake and fails to report identifiability principle, the wrong report and to fail to report identifiability principle specific as follows:
When singlephase earth fault occurs, and when fault detector fails to report singlephase earth fault signal, decision principle are as follows:
Principle 1: when a phase voltage bust in feeder line, another two-phase voltage jumps, and the faulty finger of fault detector downstream institute
Show that then the fault detector reports singlephase earth fault signal when sending singlephase earth fault signal on device at least 1；
When not occurring singlephase earth fault, and when fault detector wrong report singlephase earth fault signal, decision principle are as follows:
Principle 2: when none phase voltage bust in feeder line, another two-phase voltage jumps situation, and send on fault detector single-phase
When earth-fault signal, then the fault detector does not report singlephase earth fault signal；
Step 3 determines that mathematical model and the singlephase earth fault are believed according to the fault detector singlephase earth fault
Number report and fail to report the singlephase earth fault signal sent on identifiability principle identification of defective indicator by mistake, by singlephase earth fault signal into
After row amendment, it converts singlephase earth fault decision problem to the logical operation of the minimum each equipment room in fault verification region, according to
Logical operation formula determines the whether faulty indicator singlephase earth fault in the minimum fault verification region and occurs；Specifically such as
Under:
It is considered believable by data identification and modified fault-signal, fault verification can be carried out, it is single-phase
The basis that ground fault determines is minimum fault verification region, and fault verification criterion is as follows:
Criterion 1: if the domain singlephase earth fault signal that enters in the minimum fault verification region exists, and the minimum failure
The domain singlephase earth fault signal that goes out of determinating area is not present, then there is singlephase earth fault in the minimum fault verification region；
Criterion 2: if the domain singlephase earth fault signal that enters in the minimum fault verification region exists, and the minimum failure
There is also then the minimum fault verification region occurs the domain singlephase earth fault signal that goes out of determinating area without singlephase earth fault；
If AR indicates that a minimum fault verification area fault logical value, logical value indicate singlephase earth fault for 1
In the minimum fault verification region, logical value is that 0 expression singlephase earth fault does not occur in the minimum fault verification region,
Logic calculation expression formula are as follows:
" && " is logic and operation；What Fin indicated the minimum fault verification region enters domain singlephase earth fault signal logic
Value, logical value are that the domain singlephase earth fault signal that enters in the 1 expression minimum fault verification region exists, and logical value is 0 table
Show that the domain singlephase earth fault signal that enters in the minimum fault verification region is not present；It is the logical not operation of GFout,
GFout indicates the singlephase earth fault signal logic value for domain fault detector group in the minimum fault verification region, logic
Value indicates that the singlephase earth fault signal for domain fault detector group in the minimum fault verification region exists for 1, logical value
The singlephase earth fault signal for going out domain fault detector group for the 0 expression minimum fault verification region is not present, specifically:
GFout={ Fout1||Fout2||…||Foutn}
" | | " it is logic or operation；FoutnIndicate the single-phase earthing for domain fault detector in minimum fault verification region
Fault-signal logical value, logical value are the domain fault detector out in the 0 expression minimum fault verification region without single-phase earthing event
Hindering signal, logical value is that going out on the fault detector of domain for the 1 expression minimum fault verification region send singlephase earth fault signal,
Wherein n is the domain fault detector number out in the minimum fault verification region, if the value that n is 0, GFout is 0.
As shown in Figure 1, certain area's distribution network is made of two feeder lines, STA1, STA2 are substation；DS1, DS2 be with
Power station；SP1~SP3 is switching station；#1~#7 is each substation, power distribution station and switching station's bus；S1, S9 are disconnected for substation's outlet
Road device switch；S2~S8, S10~S18 are switchgear house and switching station's on-load switch, and S19 is that route high-voltage switch gear makees interconnection switch
With；T1~T12 is distribution transformer；D1~D12 is overhead transmission line high-voltage switch；FI1~FI12 is fault detector；
When substation wire-outgoing breaker switch S1 and substation wire-outgoing breaker switch S9 do not trip, fault detector
Singlephase earth fault signal, A phase voltage bust are sent on FI1, FI6, FI9, BC phase voltage jumps.Failure is sent on each fault detector
Signal is as shown in table 1 (table 1 is fault-signal and identification result in Fig. 1):
Table 1:
Firstly, recognizing to singlephase earth fault signal, A phase voltage bust, BC phase voltage jumps, FI1, FI2, FI3
Send earth-fault signal on downstream fault indicator FI6, according to fault identification principle 1, FI1, FI2, FI3 should on send ground fault
Signal.FI2, FI3 not on send earth-fault signal, belong to earth-fault signal and fail to report situation.Similarly, other fault detectors
Fault-signal identification result is as shown in table 1.
Then, fault verification is carried out according to each minimum fault verification region.For region 6, ground fault is sent on FI6
Signal, FI7 not on send earth-fault signal, Fin 1, GFout 0, according to formula, the ground fault logical value AR in region 6 is
1, illustrate that singlephase earth fault occurs for the region.(table 2 is each region fault verification knot to the fault verification in other regions such as table 2
Fruit) shown in.
Table 2:
Although specific embodiments of the present invention have been described above, those familiar with the art should be managed
Solution, we are merely exemplary described specific embodiment, rather than for the restriction to the scope of the present invention, it is familiar with this
The technical staff in field should be covered of the invention according to modification and variation equivalent made by spirit of the invention
In scope of the claimed protection.
Claims (1)
1. a kind of fault detector singlephase earth fault based on worst principle determines practical method, it is characterised in that: including
Following steps:
Step 1 determines power distribution network minimum fault verification region, and determines failure according to the power distribution network minimum fault verification region
Indicator singlephase earth fault determines mathematical model；
The closed set being made of fault detector and feeder line section is known as fault verification region, if a fault verification region
All endpoints be all fault detector and be all T contact without interior point or all interior points, then claim the fault verification region
For minimum fault verification region；
It flows through single-phase earth fault current and flows into the fault detector in minimum fault verification region and be known as the minimum fault verification
Region enters domain fault detector, the singlephase earth fault signal sent thereon be known as the minimum fault verification region to enter domain single-phase
Earth-fault signal；It flows through single-phase earth fault current and flows out the fault detector in minimum fault verification region and be known as the minimum
Fault verification region goes out domain fault detector, and the domain out that the fault-signal sent thereon is known as the minimum fault verification region is single-phase
Earth-fault signal；
Step 2 determines mathematical model according to the fault detector singlephase earth fault and is based on worst principle, determines single-phase connect
Identifiability principle is reported and failed to report to earth fault signal by mistake；The wrong report and to fail to report identifiability principle specific as follows:
When singlephase earth fault occurs, and when fault detector fails to report singlephase earth fault signal, decision principle are as follows:
Principle 1: when a phase voltage bust in feeder line, another two-phase voltage jumps, and all fault detectors in fault detector downstream
When sending singlephase earth fault signal at least 1, then the fault detector reports singlephase earth fault signal；
When not occurring singlephase earth fault, and when fault detector wrong report singlephase earth fault signal, decision principle are as follows:
Principle 2: when none phase voltage bust in feeder line, another two-phase voltage jumps situation, and single-phase earthing is sent on fault detector
When fault-signal, then the fault detector does not report singlephase earth fault signal；
Step 3 determines that mathematical model and the singlephase earth fault signal are missed according to the fault detector singlephase earth fault
The singlephase earth fault signal sent on identifiability principle identification of defective indicator is reported and failed to report, singlephase earth fault signal is repaired
After just, singlephase earth fault decision problem is converted to the logical operation of the minimum each equipment room in fault verification region, according to logic
Operational formula determines the whether faulty indicator singlephase earth fault in the minimum fault verification region and occurs；
Convert singlephase earth fault decision problem to the logical operation of the minimum each equipment room in fault verification region, specific as follows:
The basis that singlephase earth fault determines is minimum fault verification region, and fault verification criterion is as follows:
Criterion 1: if the domain singlephase earth fault signal that enters in the minimum fault verification region exists, and the minimum fault verification
The domain singlephase earth fault signal that goes out in region is not present, then there is singlephase earth fault in the minimum fault verification region；
Criterion 2: if the domain singlephase earth fault signal that enters in the minimum fault verification region exists, and the minimum fault verification
There is also then the minimum fault verification region occurs the domain singlephase earth fault signal that goes out in region without singlephase earth fault；
If AR indicates that a minimum fault verification area fault logical value, logical value are that 1 expression singlephase earth fault occurs at this
Minimum fault verification region, logical value are that 0 expression singlephase earth fault does not occur in the minimum fault verification region, logic
Calculation expression are as follows:
" && " is logic and operation；What Fin indicated the minimum fault verification region enters domain singlephase earth fault signal logic value,
Logical value is that the domain singlephase earth fault signal that enters in the 1 expression minimum fault verification region exists, and logical value indicates this most for 0
The domain singlephase earth fault signal that enters of glitch determinating area is not present；It is the logical not operation of GFout, GFout table
Show that the singlephase earth fault signal logic value for domain fault detector group in the minimum fault verification region, logical value are 1 table
Show that the singlephase earth fault signal for domain fault detector group in the minimum fault verification region exists, logical value is 0 expression
The singlephase earth fault signal for going out domain fault detector group in the minimum fault verification region is not present, specifically:
GFout={ Fout1||Fout2||L||Foutn}
" | | " it is logic or operation；FoutnIndicate the singlephase earth fault letter for domain fault detector in minimum fault verification region
Number logical value, logical value be 0 indicate the domain fault detector out in the minimum fault verification region without singlephase earth fault signal,
Its logical value is that going out on the fault detector of domain for the 1 expression minimum fault verification region send singlephase earth fault signal, and wherein n is
The minimum fault verification region goes out domain fault detector number, if the value that n is 0, GFout is 0.
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| CN105866630B (en) * | 2016-05-17 | 2018-11-09 | 许继集团有限公司 | A kind of method for diagnosing faults and system of reply whole station loss of learning |
| CN106443322B (en) * | 2016-08-31 | 2018-10-19 | 积成电子股份有限公司 | Fault detector failure judgment method based on maximum probability |
| CN109116181A (en) * | 2017-06-22 | 2019-01-01 | 南京理工大学 | A kind of fault detector failure judgment method based on maximum probability |
| CN112485602A (en) * | 2020-12-12 | 2021-03-12 | 国网辽宁省电力有限公司铁岭供电公司 | Small current grounding system fault state sensing method of wide-area synchronous time scale |
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| CN102565624B (en) * | 2011-12-21 | 2013-11-27 | 陕西电力科学研究院 | Fault-tolerant fault positioning method for distribution network |
| CN102761108B (en) * | 2012-07-18 | 2014-10-08 | 积成电子股份有限公司 | Logic operation-based distributed feeder automatization fault judgment method |
| CN102842905B (en) * | 2012-08-22 | 2014-10-08 | 积成电子股份有限公司 | Power distribution network state assessment method based on subnet worst principle |
| CN102832602B (en) * | 2012-08-31 | 2015-01-07 | 积成电子股份有限公司 | Method for improving fault judgment reliability of distributed type feeder automation |
| CN103048587B (en) * | 2012-12-12 | 2016-01-20 | 深圳供电局有限公司 | There is the Fault Locating Method of the power distribution network of distributed power source, Apparatus and system |
| CN104698342B (en) * | 2015-03-24 | 2016-04-06 | 中国石油大学(华东) | A kind of electrical power distribution network fault location method based on load point state and path logic computing |
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