CN108919046A - A kind of examination of distribution net work earthing fault stops route tagmeme decision-making technique and system - Google Patents
A kind of examination of distribution net work earthing fault stops route tagmeme decision-making technique and system Download PDFInfo
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- CN108919046A CN108919046A CN201810461211.3A CN201810461211A CN108919046A CN 108919046 A CN108919046 A CN 108919046A CN 201810461211 A CN201810461211 A CN 201810461211A CN 108919046 A CN108919046 A CN 108919046A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
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Abstract
The embodiment of the invention discloses a kind of examinations of distribution net work earthing fault to stop route tagmeme decision-making technique and system, route successively stopped to choosing and after non-loaded line road test stops, if not determining fault point yet, tagmeme examination is carried out according to its ground fault Synthetic Measurement value descending sequence to remaining route and is stopped.The present invention provides the reference frame that reliable, scientific, fixed route examination stops sequence for dispatcher, can quickly check the circuit that is out of order, ensure line security.
Description
Technical field
The present invention relates to power scheduling technical field, specifically a kind of distribution net work earthing fault examination stops route tagmeme and determines
Plan method and system.
Background technique
Singlephase earth fault is one of most common failure in distribution system.The power distribution network of neutral point indirect earthing occurs
Singlephase earth fault, earth current is smaller, and breaker protection is failure to actuate, and reminds regulation personnel by issuing ground signalling, needs
The artificial method for drawing road is taken according to route selection information to judge faulty line and be isolated.Reduce ground fault to the shadow of system power supply
It rings, is mainly realized by following two aspect：
First is that identification earth fault line provides ground path information by ground fault electrical quantity Variation Features.It is neutral
In the earth-free power distribution network of point, line selection apparatus judges earth fault line by one of following three kinds of principles.
1, zero-sequence current direction method.When single-phase earthing of small current earthing system, ground path zero-sequence current size is equal to same
The sum of bus non-fault line zero-sequence current, it is contrary.The direction of all route zero-sequence currents of earth bus, can be used as and sentence
The foundation of other earth fault line.
2, current injection method when singlephase earth fault occurs for neutral point non-direct grounding system, passes through Injection Current, tracking
Current direction can detecte earth fault, so that it is determined that ground fault section.
3, parallel medium resistance method, in neutral point non-direct grounding system, when singlephase earth fault occurs, neutral point is in short-term
The small resistance in parallel with arc suppression coil is put into, parallel low resistance constitutes earth fauit loops, fault current by earth fault
Become larger, can detecte earth fault line.
Second is that optimization examination stops line sequence in the case where earthing wire-selecting information is inaccurate, improves examination and stop being directed to for route
Property, reduce line outage.
But the above line selection apparatus only passes through low current information and provides 1 possible ground path, and due to ageing equipment, existing
The reasons such as field bad environments, route selection accuracy rate is not high, if route selection information errors, ground connection examination will be caused to stop the blindness for the treatment of process
Property and ground connection overlong time caused by the person, equipment safety risk.
Summary of the invention
A kind of examination of distribution net work earthing fault is provided in the embodiment of the present invention and stops route tagmeme decision-making technique and system, with solution
When certainly ground fault occurs in the prior art, examination stops route inaccuracy, blindness selection examination stops sequence and route is caused to be grounded for a long time,
The high problem of security risk.
In order to solve the above-mentioned technical problem, the embodiment of the invention discloses following technical solutions：
The present invention provides a kind of examinations of distribution net work earthing fault to stop route tagmeme decision-making technique, successively stops route and sky to choosing
Route is carried to try after stopping, it is descending according to its ground fault Synthetic Measurement value to remaining route if not determining fault point yet
Sequence carries out tagmeme examination and stops.
Further, the calculation formula of the ground fault Synthetic Measurement value M is
M=w1m1+w2m2+w3m3
In formula, m1For route historical failure measure value, m2For idle variation fault measurement value, m3For the survey of line construction failure
Angle value, w1、w2And w3Respectively route historical failure measure value, idle variation fault measurement value and line construction fault measurement value
Weight.
Further, the route historical failure measure value m1Calculation formula be
m1=NfG+fT
fGFor line-to-ground fault history number, fTFor line tripping fault history number, N is coefficient.
Further, the idle variation fault measurement value m2Calculating process be：
According to the accumulative average value of t moment active power, reactive power historical data, obtain distribution line has in t moment
The standard value of function power, reactive power；
When ground fault occurs, the changing value of active power before and after failure is calculated；
If the changing value of active power is more than the first setting value, m2Take 0；
If the changing value of active power is less than the first setting value, reactive power is calculated in the bust amount of fault moment；
If bust amount is positive, m2Take bust amount and fault moment idle work variable quantity and failure previous moment idle work variable quantity
The relative value of difference；
If bust amount is negative, m2Take 0.
Further, the average value accumulative according to t moment active power, reactive power historical data, obtains distribution
Route is in the detailed process of t moment active power, the standard value of reactive power：
Every Fixed Time Interval, the numerical value of the active power and reactive power in distribution line is obtained；
Calculate the relative scale of t moment active power changing value and reactive power changing value；
If the relative scale is more than the second setting value, the numerical value of the moment active power and reactive power is rejected；
If the relative scale is less than the second setting value, the moment active power and reactive power are calculated and stored
Accumulative average value, and using accumulative average value as distribution line t moment active power and reactive power standard value.
Further, the line construction fault measurement value m3Calculation formula be
m3=NB*pov
NBFor branch's number of lines, povFor the ratio of overhead transmission line in whole route.
Further, according to obtained m1、m2And m3Value, in conjunction with actual earth fault line, to weight w1、w2And w3
Adaptively adjusted.
Further, described to weight w1、w2And w3The detailed process adaptively adjusted is：
It obtains according to measure value m1、m2And m3The failure examination respectively obtained stops tagmeme nSE1、nSE2And nSE3And it actual connects
Earth fault route；
Calculate the variation delta w of weighti=nSEj/(nSE1+nSE2+nSE3), and i+j=4；
According to the variable quantity of weight, to w1、w2And w3It is adaptively adjusted, the formula adaptively adjusted is wi=vwi,+
(1-v)Δwi；V indicates the amplitude adjusted every time.
The present invention also provides a kind of examinations of distribution net work earthing fault to stop route tagmeme decision system, including ground connection examination stops sequence
Decision-making module, the ground connection examination stop Sequence Decision module and stop route selection route and nonloaded line for successively trying in ground fault,
The ground connection examination stops Sequence Decision module and is also used to remaining route according to descending suitable of its ground fault Synthetic Measurement value
Sequence carries out tagmeme examination and stops.
Further, the influence factor of the ground fault Synthetic Measurement value includes route historical failure, idle variation event
Barrier and line construction failure, the system also includes the adaptive feedback regulation module of decision parameters, the decision parameters are adaptive
Feedback regulation module is used to that practical earth fault line to be combined to carry out the weight of each influence factor of ground fault Synthetic Measurement value
Adjustment.
The effect provided in summary of the invention is only the effect of embodiment, rather than invents all whole effects, above-mentioned
A technical solution in technical solution has the following advantages that or beneficial effect：
1, on the basis of original examination first stops route selection route and then tries to stop nonloaded line, to remaining all routes according to it
Ground fault Synthetic Measurement value determines the size of its ground fault possibility, lists the rational sorting that examination stops route.To dispatch people
Member provides reliable, scientific, fixed examination and stops route reference frame, can quickly check the circuit that is out of order, and ensures line security.
2, electrical quantity anomalous variation situation when according to the fault history of route, line construction and failure, quantitatively indicates
Every line-to-ground fault possibility ground size, and according to the size of ground fault Synthetic Measurement value, corresponding examination is provided and stops line
Road sequence.Overcome influence line-to-ground fault many factors can not comprehensive quantification indicate the shortcomings that.
3, the decision formula of ground fault Synthetic Measurement value is proposed, and proposes the adaptive feedback regulation side of weight parameter
Method adjusts the weight parameter of correlative factor in decision formula according to practical ground connection information.To realize decision formula according to practical event
Hinder the adaptive adjustment of result.The accuracy of line-to-ground fault Synthetic Measurement decision formula is continuously improved.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the flow diagram of the method for the invention；
Fig. 2 is ground fault Synthetic Measurement value influence factor of the present invention and obtains trying to stop sequence according to Synthetic Measurement value
Logical schematic；
Fig. 3 is the distribution system single phase earthing failure schematic diagram of neutral point indirect earthing of the present invention；
Fig. 4 is that active power of the present invention, reactive power add up the calculation flow chart of average value；
Fig. 5 is the idle variation fault measurement value m of the present invention2Calculation flow chart；
Fig. 6 is the flow diagram that weight of the present invention adaptively adjusts.
Specific embodiment
In order to clarify the technical characteristics of the invention, below by specific embodiment, and its attached drawing is combined, to this hair
It is bright to be described in detail.Following disclosure provides many different embodiments or example is used to realize different knots of the invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.
Stop line sequence as shown in Figure 1, stopping Sequence Decision module by ground connection examination and providing ground connection examination, stops in original examination first
On the basis of route selection route and nonloaded line, its ground fault may be determined according to its ground fault Synthetic Measurement value to remaining route
Property size, list examination and stop the rational sorting of route.Each line-to-ground fault Synthetic Measurement is worth decision formula by route history
Failure, line construction failure and idle variation fault condition etc. determine.After determining earth fault line, practical ground path is believed
Breath passes through the relevant parameter of the adaptive feedback adjustment module feedback of decision parameters to decision formula, decision formula is continuously improved
Order of accuarcy.
In Fig. 1, ground connection examination stops Sequence Decision module after receiving ground fault information, determines route selection according to route selection information
Route determines nonloaded line according to line load information.Route selection route is classified as the examination of the first cis-position and stops sequence, nonloaded line is arranged
Stop sequence for the examination of the second cis-position, if ground path does not determine after examination stops route selection route and nonloaded line, remaining route examination stops
Sequence sorts by ground fault Synthetic Measurement value.Stop after determining ground path according to sequence examination, actual ground path is believed
Breath feeds back to the adaptive feedback regulation module of decision parameters, which adjusts ground fault measure function according to practical ground connection information
In corresponding influence factor weight, and by parameter assignment adjusted in the decision formula of route.To realize decision formula root
The factually adaptive adjustment of border fail result.
As shown in Fig. 2, the ground fault for seeking characterizing its ground fault possibility size is comprehensive for every distribution line
Measure value stops sorting according to the examination that respective lines are listed in the sequence of its ground fault Synthetic Measurement value size.
Line-to-ground resultant fault measure value M is by historical failure measure value (m1), idle variation fault measurement value (m2), line
Line structure fault measurement value (m3) assign different weight (w1、w2、w3) weighted sum obtains.I.e.
M=w1m1+w2m2+w3m3
For the stability and w for guaranteeing ground fault Synthetic Measurement value M1、w2、w3The feasibility adaptively adjusted, takes w1+w2+
w3=1.
For every faulty line historical failure measure value m1, idle variation fault measurement value m2It is surveyed with line construction failure
Angle value m3 specifically calculates method for solving and w1、w2、w3Self-adapting regulation method is as follows：
Line fault historical failure measure value m1：Take m1=NfG+fT, f in formulaGFor line-to-ground fault history number, fTFor
Line tripping fault history number, takes fGWeight is fTN times, N takes the value greater than 5, indicates line-to-ground historical failure to route
The reference degree of ground fault possibility is much larger than tripping fault.
Fig. 3 illustrates the ground fault in the case of the distribution system single phase earthing of neutral point indirect earthing, and Z, C are respectively
The equivalent impedance and equivalent capacitance of route, ZfFor single-phase earthing impedance, iCFor the capacitive earth current of respective lines.Single-phase earthing
Afterwards, it is the earth-fault current I that the earth flows to bus that earth fault line, which increases direction,f, therefore it is reflected in reactive power distribution aspect,
For the idle output bust of earth fault line.Therefore by control ground fault after the idle situation of change (Δ QF) of distribution line with
Difference between the normal reactive power fluctuation (Δ Q) of route characterizes the size of line-to-ground fault possibility.
Idle variation fault measurement value m2Seek by data acquire, screening, memory module complete.Under normal circumstances, it adjusts
Spending automated system is 300s (5min) to distribution line active power value, reactive power value, load value sampling interval.For certain
One fixed time t takes daily moment (t) active power, reactive power to add up average value respectively, as the distribution line this when
Carve the standard value of (t) active reactive, the basis of reference as the idle situation of change of route in the case of singlephase earth fault.
As shown in figure 4, every Fixed Time Interval, acquisition is matched before calculating active power, reactive power adds up average value
Active-power P ' (t) in electric linenAnd reactive power Q ' (t)nNumerical value；Calculate t moment active power changing value and idle function
The relative scale of rate changing value, calculation formula areIf relative scale is more than the second setting value, the moment is rejected
The numerical value of active power and reactive power, accumulative average value is constant, i.e. P (t)n=P (t)n-1；Q(t)n=Q (t)n-1；If comparing
Example is less than the second setting value, then calculates and store the accumulative average value of the moment active power and reactive power, t moment is active
Power, reactive power add up average value calculation formula be respectively
And using accumulative average value as distribution line t moment active power and reactive power standard value.Second sets in the present embodiment
Definite value is 1.2, i.e. basisCarry out the screening of numerical value.P'(t),Q'(t)nWhen respectively indicating n-th day t
Carve active power, the reactive power of the distribution line, P (t), Q (t)nThe active power of route and idle after indicating accumulative average
Performance number.
As shown in figure 5, when ground fault occurs, according to obtained distribution line in t moment active power, reactive power
Standard value, calculate the changing value of active power before and after failure, the calculation formula of active power changing value isIf active
The changing value of power is more than the first setting value, active power changing value be more than the first setting value when, it is believed that idle variation because
Load variations cause, and do not consider because ground fault causes, then m20 is taken, the first setting value takes 1.5 in the present embodiment, that is, meetsm2Take 0；If the changing value of active power is less than the first setting value, reactive power is calculated in failure
The bust amount at quarter, bust amount Δ QFCalculation formula be Δ QF=Q ' (t-1)n-Q′(t)nIf bust amount is positive, m2Take bust
The relative value of amount and fault moment idle work variable quantity and failure previous moment idle work variable quantity difference, if bust amount is negative, m2
Take 0, i.e.,
Wherein Δ Q=| Q (t-1)n-1-Q(t)n-1|.It should be noted is that the value of m (Δ Q) shown in Fig. 5, that is, decision is public
M in formula2Value, because of m2Value be variable, in Fig. 5 with m (Δ Q) indicate.
Line construction fault measurement value m3：Take m3=NB*pov, NBFor branch's number of lines, povFor overhead transmission line in whole route
Ratio.More with quantized versions characterization branch's number of lines, the big route of overhead transmission line ratio is by biggish ground fault possibility.
As shown in fig. 6, being carried out after trying to stop according to decision formula, in conjunction with influence factor in actual earth fault line and 3
Fault measurement value m1、m2、m3Order of accuarcy, adjust m1、m2、m3Weighted value in decision formula.Order of accuarcy is higher
Increase its weighted value, lower its weighted value of reduction of order of accuarcy.
It is obtained respectively according to measure value m1、m2And m3The failure examination respectively obtained stops tagmeme nSE1、nSE2And nSE3, corresponded to
Sequence k1、k2、k3And actual earth fault line；Calculate the variation delta w of weighti, formula is Δ wi=nSEj/(nSE1
+nSE2+nSE3), and i+j=4, nSEjIt indicates and sequence nSEiIn nSE1、nSE2、nSE3Middle sequence kiOpposite sequence number, even ki
=1, then kj=3；If ki=2, then kj=2；If ki=3, then kj=1.For example, it is directed to actual earth fault line, if according to
It is 2 that sequence is drawn in its examination of line fault historical failure measure value m1；According to idle variation fault measurement value m2It tries to draw sequence to be 3；
According to line construction fault measurement value m3It tries to draw sequence to be 4；Then Δ w1=4/ (2+3+4)；Δw2=3/ (2+3+4)；Δw2=
2/(2+3+4)；
According to the variable quantity of weight, to w1、w2And w3It is adaptively adjusted, the formula adaptively adjusted is wi=vwi,+
(1-v)Δwi；The amplitude that v expression adjusts every time, 0<v<1.
The above is the preferred embodiment of the present invention, for those skilled in the art,
Without departing from the principles of the invention, several improvements and modifications can also be made, these improvements and modifications are also regarded as this hair
Bright protection scope.
Claims (10)
1. a kind of distribution net work earthing fault examination stops route tagmeme decision-making technique, it is characterized in that：Route and non-loaded line successively are stopped to choosing
After road test stops, if not determining fault point, the sequence descending according to its ground fault Synthetic Measurement value to remaining route yet
Tagmeme examination is carried out to stop.
2. a kind of distribution net work earthing fault examination according to claim 1 stops route tagmeme decision-making technique, it is characterized in that：It is described
The calculation formula of ground fault Synthetic Measurement value M is
M=w1m1+w2m2+w3m3
In formula, m1For route historical failure measure value, m2For idle variation fault measurement value, m3For line construction fault measurement value,
w1、w2And w3Respectively route historical failure measure value, the idle power for changing fault measurement value and line construction fault measurement value
Weight.
3. a kind of distribution net work earthing fault examination according to claim 2 stops route tagmeme decision-making technique, it is characterized in that：It is described
Route historical failure measure value m1Calculation formula be
m1=NfG+fT
fGFor line-to-ground fault history number, fTFor line tripping fault history number, N is coefficient.
4. a kind of distribution net work earthing fault examination according to claim 2 stops route tagmeme decision-making technique, it is characterized in that：It is described
Idle variation fault measurement value m2Calculating process be：
According to the accumulative average value of t moment active power, reactive power historical data, distribution line is obtained in t moment wattful power
Rate, the standard value of reactive power；
When ground fault occurs, the changing value of active power before and after failure is calculated；
If the changing value of active power is more than the first setting value, m2Take 0；
If the changing value of active power is less than the first setting value, reactive power is calculated in the bust amount of fault moment；
If bust amount is positive, m2Take bust amount and fault moment idle work variable quantity and failure previous moment idle work variable quantity difference
Relative value；
If bust amount is negative, m2Take 0.
5. a kind of distribution net work earthing fault examination according to claim 4 stops route tagmeme decision-making technique, it is characterized in that：It is described
According to the accumulative average value of t moment active power, reactive power historical data, distribution line is obtained in t moment active power, nothing
The detailed process of the standard value of function power is：
Every Fixed Time Interval, the numerical value of the active power and reactive power in distribution line is obtained；
Calculate the relative scale of t moment active power changing value and reactive power changing value；
If the relative scale is more than the second setting value, the numerical value of the moment active power and reactive power is rejected；
If the relative scale is less than the second setting value, the accumulative of the moment active power and reactive power is calculated and stored
Average value, and using accumulative average value as distribution line t moment active power and reactive power standard value.
6. a kind of distribution net work earthing fault examination according to claim 2 stops route tagmeme decision-making technique, it is characterized in that：It is described
Line construction fault measurement value m3Calculation formula be
m3=NB*pov
NBFor branch's number of lines, povFor the ratio of overhead transmission line in whole route.
7. a kind of distribution net work earthing fault examination according to claim 2 stops route tagmeme decision-making technique, it is characterized in that：According to
Obtained m1、m2And m3Value, in conjunction with actual earth fault line, to weight w1、w2And w3Adaptively adjusted.
8. a kind of distribution net work earthing fault examination according to claim 7 stops route tagmeme decision-making technique, it is characterized in that：It is described
To weight w1、w2And w3The detailed process adaptively adjusted is：
It obtains according to measure value m1、m2And m3The failure examination respectively obtained stops tagmeme nSE1、nSE2And nSE3And actual ground connection event
Hinder route；
Calculate the variation delta w of weighti=nSEj/(nSE1+nSE2+nSE3), and i+j=4；
According to the variable quantity of weight, to w1、w2And w3It is adaptively adjusted, the formula adaptively adjusted isV indicates the amplitude adjusted every time.
9. a kind of distribution net work earthing fault examination stops route tagmeme decision system, including ground connection examination stops Sequence Decision module, described to connect
Ground examination stops Sequence Decision module and stops route selection route and nonloaded line for successively trying in ground fault, it is characterized in that：It is described to connect
Ground examination stops Sequence Decision module and is also used to carry out remaining route according to the descending sequence of its ground fault Synthetic Measurement value
Tagmeme examination stops.
10. a kind of distribution net work earthing fault examination according to claim 9 stops route tagmeme decision system, it is characterized in that：Institute
The influence factor for stating ground fault Synthetic Measurement value includes route historical failure, idle variation failure and line construction failure, institute
The system of stating further includes the adaptive feedback regulation module of decision parameters, and the adaptive feedback regulation module of decision parameters is for combining
Practical earth fault line is adjusted the weight of each influence factor of ground fault Synthetic Measurement value.
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| CN112015160A (en) * | 2019-05-31 | 2020-12-01 | 北京新能源汽车股份有限公司 | Fault temperature determination method and device |
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