CN107015123B - A kind of accurate determination method of transmission line malfunction based on recorder data - Google Patents
A kind of accurate determination method of transmission line malfunction based on recorder data Download PDFInfo
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- CN107015123B CN107015123B CN201710419543.0A CN201710419543A CN107015123B CN 107015123 B CN107015123 B CN 107015123B CN 201710419543 A CN201710419543 A CN 201710419543A CN 107015123 B CN107015123 B CN 107015123B
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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 invention discloses a kind of accurate determination methods of the transmission line malfunction based on recorder data, include the following steps: S1, bus Auto-matching；S2, zero sequence analog signals reversal connection intelligent recognition and correction；S3, circuit breaker trip is determined using full analog signals；S4, boundary anticipatory method screen fault reference point；S5, the anti-misoperation locking based on the identification of busbar voltage perturbation features.The present invention adapts to the random change of grid operation mode, the channel reversal connection phenomenon easily occurred when compatible scene electrical construction, avoid judgment basis deficiency problem in kernel state amount signal configuration parameter missing/infull situation, overcome and relies on the unreliability that single failure datum mark is easily sent out in the past, various emulation signal interferences threaten when releasing substation's test, the accuracy that faulty line judgement greatly improved, has closely agreed with power system management and operation characteristic.
Description
Technical field
The present invention relates to technical field of electric power more particularly to a kind of transmission line malfunction based on recorder data accurately to determine
Method.
Background technique
As the black box of substation operation record, every oscillograph can be simultaneously to a plurality of transmission line of electricity (also known as route)
It is monitored, it is specified that the power transmission line number of every oscillograph monitoring is 6 to 8 by taking a 220kV substation as an example, and is used
In digitlization oscillograph then up to 30 of intelligent substation.About 95% electric network fault betides on transmission line of electricity, is formed short
Road effect, due to the sensitivity of oscillograph record, either power grid normal disturbances or transmission line malfunction, related data all can
It is recorded and is analyzed by oscillograph.When transmission line malfunction, the electrical quantity of several adjacent routes can also show similar features,
Therefore, it to the judgement of faulty line, first has to distinguish with various grid disturbances, the doubtful feature of secondary same adjacent lines
It is screened, additionally needs to fully consider other possible unexpected factors, prevent from judging, failing to judge phenomenon by accident.
In informationization technology highly developed today, substation has been realized in unattended, power regulation department dependence
Throughout oscillograph everywhere, full automatic Stateful Inspection and fault verification are implemented to intensive power transmission line corridor, once occur
The erroneous judgement of transmission line malfunction is failed to judge, and will cause consequence difficult to the appraisal to the accident treatment of scheduling administrative staff.Therefore, base
The accurate judgement under various scenes is carried out to faulty line in recorder data, is conducive to rapid development emergency preplan and line inspection defect elimination
Measure ensures transmission reliability, reduces loss of outage.Faulty line is determined based on recorder data, the technology faced is asked
Topic has:
Bus mispairing.The adjustment of grid operation mode be it is random, the bus that route is mounted also can be adjusted accordingly, but adjust
Parameter after whole does not notify oscillograph, causes in recorder data record, and the bus parameter of route mounting is same not to be inconsistent actually, from
And cause to judge by accident.
Zero sequence reversal connection.Oscillograph is when accessing the analog signals of substation bus bar and route, the zero sequence of voltage and current
Signal secondary circuit is just the opposite in the connection of channel, therefore it is anti-by zero sequence to be easy human error during electrical construction
It connects, signal acquisition source is caused just to malfunction, influence judgement of the later period to faulty line.
Important state parameter definition missing.Oscillograph monitors in signal, in addition to necessary busbar voltage, line current etc.
Analog signals further include the state quantity signals such as protection act, the circuit breaker trip being equipped with for route, and wherein circuit breaker trip is believed
It number is the foundation for determining that line failure is most directly strong.But in actual disposition, since different manufacturers oscillograph is set in function
Difference on meter, the important state signal parameter closely related with route usually defines not rigorously, or even missing, is fault wire
The intuitive judgment on road causes trouble.
It is high that fault reference point chooses risk.Determine that route troubles inside the sample space first has to based on reasonable ranging datum mark, it is theoretical
On, any one point is all good selection in time window A, but this is only for metallic short circuit class ideal type failure.
As lightning stroke wave, this kind of developing fault of mountain fire, each electrical component numerical discretization degree of adjacent moment is very big, chooses different datum marks
Distance measurement result difference it is obvious, under extreme case, have the datum mark of half that ranging localization result can be made to fall in outside area in time window A
Or opposite direction, become " minefield ".Therefore, the selection of fault reference point often has certain chance component, and error probability is high, pole
Easily cause and fails to judge.
Emulation data of the electric system personnel when substation is engaged in test, regular inspection activity are the same as physical fault data height phase
Seemingly, it is big to screen difficulty.It advances by leaps and bounds as experimental assembly manufacturing capacity and theory of algorithm are horizontal, substation field has had energy
Power simulates the various signals extremely approached with true electric network fault scene on secondary circuit, is not only embodied in analog signals
In terms of fidelity, also there are few difference for the action logic of state quantity signal, timing variations, even if manual identified is all highly difficult, one
Denier causes erroneous judgement, and consequence is extremely serious.
The faulty line characteristic quantity signal of standard is as shown in Figure 3.T0 moment route is in normal duty state, and Tn is failure
Starting point, the Tb moment that is protected in which is equipped with output action signal, and breaker trips after receiving action signal in the Tc moment,
Failure phase load to Tm dotted line road is removed, current signal 0.
Summary of the invention
The invention proposes a kind of accurate determination methods of the transmission line malfunction based on recorder data, to solve above-mentioned background
The problem of being proposed in technology.
The invention proposes a kind of accurate determination methods of the transmission line malfunction based on recorder data, include the following steps:
S1, bus Auto-matching: when transmission line of electricity breaks down, the current value of failure phase short dot be increased dramatically, voltage
Value reduces in various degree, and short dot is closer apart from oscillograph, and the amplitude that voltage value reduces is bigger, passes through voltage value when measuring and calculating failure
The dough softening, can Auto-matching be out of order the true bus that route mounted, steps are as follows:
The bus that A1, basis initially mount, determines the voltage class of the route, and then filters out all of same voltage class
Bus is included in the alternative echelon of bus；
A2, the calculating of voltage attenuation degree is carried out to initial mounting bus, on the basis of T0, and T0 is specially first sampled point
Moment calculates separately primitive period component virtual value Ua, Ub, Uc of bus A, B, C three-phase voltage, i.e., load when bus is normal
Voltage；
If any one of A3, Ua, Ub, Uc are less than 35V, the bus is abandoned, carries out next alternative bus matching；
A4, otherwise, on the basis of Tn, and Tn is specially failure point moment, continuous for interval with 1 millisecond in time window A
Calculating is taken, counts minimum primitive period component virtual value Ua ', the Ub ', Uc ' of bus A, B, C three-phase voltage respectively；
A5, Ua "=(Ua '-Ua)/Ua, Ub "=(Ub '-Ub)/Ub, Uc "=(Uc '-Uc)/Uc is set, if | Ua " |, | Ub "
|, | Uc " | any one of be not less than 10%, then match bus success, process terminates；
A6, otherwise repeats step A2, A3, A4, A5, successively judges alternative echelon's median generatrix, until successful match
Bus out；
If being still unable to successful match after the completion of A7, above-mentioned steps goes out bus, matching initial mounts bus；
S2, zero sequence analog signals reversal connection intelligent recognition and correction: at any time, busbar voltage zero sequence analog signals
Instantaneous value Un1=- | Ua1+Ub1+Uc1 |, line current zero sequence analog signals instantaneous value In1=| Ia1+Ib1+Ic1 |,
In, Ua1, Ub1, Uc1 are respectively the instantaneous value of bus A, B, C three-phase voltage analog signals, and Ia1, Ib1, Ic1 are respectively route
A, the instantaneous value of B, C three-phase current analog signals；
It is the unique foundation for determining ground property failure in view of zero sequence analog signals, once there is zero sequence reversal connection, if not
Identification and corrective measure are taken, faulty line is will result directly in and fails to judge；
When carrying out target line relevant calculation, on the basis of Tn, current zero sequence analog signals are counted in time window A
Maximum instantaneous value In_max and In_max corresponding at the time of point, and calculate moment point A, B, C three-phase current analog quantity letter
The sum of number instantaneous value Iabc can determine that current zero sequence analog signals channel is not anti-if In_max is consistent with Iabc sign symbol
It connects, is otherwise considered as reversal connection, if being reversely connected, correction mode is all to negate current zero sequence analog signals instantaneous value symbol；
When carrying out the bus relevant calculation of target line mounting, on the basis of Tn, voltage zero sequence is counted in time window A
At the time of point corresponding to the maximum instantaneous value Un_max and Un_max of analog signals, and calculate moment point A, B, C three-phase electricity
The sum of pressing mold analog quantity sample Uabc, if Un_max and Uabc sign symbol are on the contrary, can determine that voltage zero sequence analog quantity is believed
Number channel is not reversely connected, is otherwise considered as reversal connection, if being reversely connected, correction mode is by voltage zero sequence analog signals instantaneous value symbol
All negate；
By the reversal connection automatic identification of zero sequence analog signals and correction, the true electric simulation amount letter of fault moment is restored
Number feature is cleared away the obstacles for being appropriately determined for target line；
S3, circuit breaker trip is determined using full analog signals:
When line failure, current in the short is increased rapidly, and causes the protective device being equipped with for the route at the Tb moment
Signal is acted and issues, breaker trips after receiving signal at the Tc moment, disjunction short dot, the event after tripping successfully, on route
Hinder phase load to be removed in Tm, electric current be 0 and keep, wherein, Tb be the protection act moment, Tc is circuit breaker trip moment, Tm
For failure removal point moment；
Circuit breaker trip judgement is carried out based on full analog signals, method is to determine the event of target line in time window B
Whether barrier phase current analog signal instantaneous value is continuously 0, and determining to set up then indicates circuit breaker trip；
It further include approximation, it is now assumed that the approximation is Z0, the then obtaining value method of Z0 are as follows:
B1, it calculates separately in T0 moment target line A, B, C three-phase current analog signals primitive period component virtual value
(two sub-values), is denoted as Ia, Ib, Ic, takes their maximum, is denoted as Imax, i.e. target line maximum phase load under normal circumstances
Electric current；
If B2, Imax are not more than 0.005, Z0=0.002, value process terminates；
B3, otherwise, Z0=Imax/25, if Z0 is not more than 0.01, Z0=0.01；
If B4, Z0 are not less than Imax/3, Z0=Imax/3；
If B5, Z0 are not less than 0.1, Z0=0.1；
After determining Z0, on the basis of failure removal point Tm, to faulted phase current analog signals instantaneous value in time window B
Remain 0 discriminant approach are as follows:
C1, initialization counter 0, for indicating that instantaneous value is continuously less than the number of Z0；
C2, on the basis of failure removal point Tm, in time window B, with 1 millisecond for interval, the electricity of node-by-node algorithm failure phase
Flow field simulation amount signal primitive period component virtual value, if being less than Z0, counter adds 1, otherwise counter clear 0；
If C3, counter are greater than 12, determine to set up, that is, confirm circuit breaker trip, process terminates；
C4, otherwise, in time window B, counter is not more than 12 always, then can confirm that breaker does not trip, to the event
The determination flow of barrier phase terminates；
If there are multiple failure phases for C5, target line, by mutually repeating the above steps, wherein any one phase confirmation road device is jumped
Lock is all considered as effectively, otherwise, can determine that breaker does not trip；
S4, boundary anticipatory method screen fault reference point: determine that route troubles inside the sample space must first establish a fault reference point,
The opportunity range that datum mark is chosen can be from Tn until Tm, ideal to choose opportunity in time window A；
The measure of boundary anticipatory method screening fault reference point method are as follows:
D1, the first length parameter according to target line, and length unit is kilometer, forward direction amplification extends 10%, reversely puts
Big to extend 2%, the two boundary values establish the effective coverage of ranging localization result；
D2, initialization counter 0, for indicating the datum mark number in alternative echelon；
D3, on the basis of fault moment point Tn, with 1 millisecond for interval in time window A, continuously take and to carry out a ranging localization
Measuring and calculating, if results of measuring falls in effective coverage, counter adds 1；
D4, such as counter reach 10, no longer carry out remaining measuring and calculating, are directly entered step D6；
D5, otherwise, after time window A, counter is less than 3, qualified datum mark number deficiency, and target line excludes, stream
Journey terminates；
If D6, counter are not less than 3, " leaving out the beginning and the end " method is used, maximum value and minimum value in alternative echelon are removed, it is remaining
Lower value is averaged, that is, most ideal measuring and calculating distance；
D7, in each datum mark of alternative echelon, take one closest to ideal measuring and calculating distance to be used as final fault reference point,
Confirm that troubles inside the sample space occurs for target line simultaneously；
S5, the anti-misoperation locking based on the identification of busbar voltage perturbation features
The anti-misoperation locking algorithm identified by the perturbation features to busbar voltage is as follows:
E1, pass through aforementioned bus automatic matching method, filter out the bus that target line is mounted；
E2, on the basis of T0, and T0 is specially first sampling point moment, calculates separately busbar channel A, B, C three-phase electricity
Press primitive period component virtual value Ua, Ub, Uc, i.e., load voltage when bus is normal；
If any one of E3, Ua, Ub, Uc are less than 35V, directly confirmation is emulation data, and anti-misoperation locking is set up, process knot
Beam；
E4, otherwise, on the basis of Tn, in time window A with 1 millisecond for interval, counts A, B, C three-phase voltage channel respectively
Minimum primitive period component virtual value Ua ', Ub ', Uc ', and maximum residual voltage primitive period component virtual value Un '；
E5, Ua "=(Ua '-Ua)/Ua, Ub "=(Ub '-Ub)/Ub, Uc "=(Uc '-Uc)/Uc is set, if | Ua " |, | Ub "
|, | Uc " | any one of more than 3%, can confirm it is non-emulated data, anti-misoperation locking releases, and process terminates；
E6, otherwise can also confirm it is non-emulated data if Un ' is greater than 1.8, and anti-misoperation locking releases, and process terminates；
If E7, E5, E6 cannot release anti-misoperation locking, emulation data can be confirmed as, anti-misoperation locking need to be carried out, must not be missed
Report.
The present invention adapts to the random change of grid operation mode, and the channel easily occurred when being compatible with scene electrical construction is anti-
Phenomenon is connect, judgment basis deficiency problem in kernel state amount signal configuration parameter missing/infull situation is avoided, overcomes and rely in the past
The unreliability that single failure datum mark is easily sent out, various emulation signal interferences threaten when releasing substation's test, greatly improved
The accuracy that faulty line determines, has closely agreed with power system management and operation characteristic, has extremely strong specific aim and is applicable in
Property.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the accurate determination method of transmission line malfunction based on recorder data of the invention；
Fig. 2 is a kind of schematic diagram of the accurate determination method of transmission line malfunction based on recorder data of the invention；
Fig. 3 is transmission line malfunction characteristic feature amount signal schematic representation of the invention.
Specific embodiment
It is next combined with specific embodiments below that the present invention will be further described.
Such as Fig. 1, the invention proposes a kind of accurate determination method of the transmission line malfunction based on recorder data, including it is as follows
Step:
S1, bus Auto-matching: when transmission line of electricity breaks down, the current value of failure phase short dot be increased dramatically, voltage
Value reduces in various degree, and short dot is closer apart from oscillograph, and the amplitude that voltage value reduces is bigger, passes through voltage value when measuring and calculating failure
The dough softening, can Auto-matching be out of order the true bus that route mounted, steps are as follows:
The bus that A1, basis initially mount, determines the voltage class of the route, and then filters out all of same voltage class
Bus is included in the alternative echelon of bus；
A2, the calculating of voltage attenuation degree is carried out to initial mounting bus, on the basis of T0, and T0 is specially first sampled point
Moment calculates separately primitive period component virtual value Ua, Ub, Uc of bus A, B, C three-phase voltage, i.e., load when bus is normal
Voltage；
If any one of A3, Ua, Ub, Uc are less than 35V, the bus is abandoned, carries out next alternative bus matching；
A4, otherwise, on the basis of Tn, and Tn is specially failure point moment, continuous for interval with 1 millisecond in time window A
Calculating is taken, counts minimum primitive period component virtual value Ua ', the Ub ', Uc ' of bus A, B, C three-phase voltage respectively；
A5, Ua "=(Ua '-Ua)/Ua, Ub "=(Ub '-Ub)/Ub, Uc "=(Uc '-Uc)/Uc is set, if | Ua " |, | Ub "
|, | Uc " | any one of be not less than 10%, then match bus success, process terminates；
A6, otherwise repeats step A2, A3, A4, A5, successively judges alternative echelon's median generatrix, until successful match
Bus out；
If being still unable to successful match after the completion of A7, above-mentioned steps goes out bus, matching initial mounts bus；
S2, zero sequence analog signals reversal connection intelligent recognition and correction: at any time, busbar voltage zero sequence analog signals
Instantaneous value Un1=- | Ua1+Ub1+Uc1 |, line current zero sequence analog signals instantaneous value In1=| Ia1+Ib1+Ic1 |,
In, Ua1, Ub1, Uc1 are respectively the instantaneous value of bus A, B, C three-phase voltage analog signals, and Ia1, Ib1, Ic1 are respectively route
A, the instantaneous value of B, C three-phase current analog signals；
It is the unique foundation for determining ground property failure in view of zero sequence analog signals, once there is zero sequence reversal connection, if not
Identification and corrective measure are taken, faulty line is will result directly in and fails to judge；
When carrying out target line relevant calculation, on the basis of Tn, current zero sequence analog signals are counted in time window A
Maximum instantaneous value In_max and In_max corresponding at the time of point, and calculate moment point A, B, C three-phase current analog quantity letter
The sum of number instantaneous value Iabc can determine that current zero sequence analog signals channel is not anti-if In_max is consistent with Iabc sign symbol
It connects, is otherwise considered as reversal connection, if being reversely connected, correction mode is all to negate current zero sequence analog signals instantaneous value symbol；
When carrying out the bus relevant calculation of target line mounting, on the basis of Tn, voltage zero sequence is counted in time window A
At the time of point corresponding to the maximum instantaneous value Un_max and Un_max of analog signals, and calculate moment point A, B, C three-phase electricity
The sum of pressing mold analog quantity sample Uabc, if Un_max and Uabc sign symbol are on the contrary, can determine that voltage zero sequence analog quantity is believed
Number channel is not reversely connected, is otherwise considered as reversal connection, if being reversely connected, correction mode is by voltage zero sequence analog signals instantaneous value symbol
All negate；
By the reversal connection automatic identification of zero sequence analog signals and correction, the true electric simulation amount letter of fault moment is restored
Number feature is cleared away the obstacles for being appropriately determined for target line；
S3, circuit breaker trip is determined using full analog signals: the quantity of state displacement signal that circuit breaker trip issues is very
Key is the necessary condition for determining target line and breaking down, and in engineering actual disposition, in many cases in recorder data simultaneously
Without strictly according to the facts, complete reflection circuit-breaker status amount configuration information, causes circuit breaker trip signal that can not confirm, hamper failure
Route determines；
When line failure, current in the short is increased rapidly, and causes the protective device being equipped with for the route at the Tb moment
Signal is acted and issues, breaker trips after receiving signal at the Tc moment, disjunction short dot, the event after tripping successfully, on route
Hinder phase load to be removed in Tm, electric current be 0 and keep, wherein, Tb be the protection act moment, Tc is circuit breaker trip moment, Tm
For failure removal point moment；
According to characteristic principle of the failure phase load before and after circuit breaker trip, full analog signals can be based on, identify target
The faulted phase current of route can retrodict judgement breaker from the analog signals variation characteristic for becoming 0 and keeping process is increased to
Tripping is not influenced by the error of its configuration parameter, incomplete factor to get rid of the dependence to state quantity signal, has both flexibility
And reliability；
Circuit breaker trip judgement is carried out based on full analog signals, method is to determine the event of target line in time window B
Whether barrier phase current analog signal instantaneous value is continuously 0, and determining to set up then indicates circuit breaker trip；
It is not also proper numerical value " 0 " that instantaneous value, which is 0, usually by the faradic effect of zero sequence, actually
One lesser limiting value of numerical value, limiting value are also influenced by fault type, the method for operation, and certain fluctuation is shown, also
Including approximation, it is now assumed that the approximation is Z0, the then obtaining value method of Z0 are as follows:
B1, it calculates separately in T0 moment target line A, B, C three-phase current analog signals primitive period component virtual value
(two sub-values), is denoted as Ia, Ib, Ic, takes their maximum, is denoted as Imax, i.e. target line maximum phase load under normal circumstances
Electric current；
If B2, Imax are not more than 0.005, Z0=0.002, value process terminates；
B3, otherwise, Z0=Imax/25, if Z0 is not more than 0.01, Z0=0.01；
If B4, Z0 are not less than Imax/3, Z0=Imax/3；
If B5, Z0 are not less than 0.1, Z0=0.1；
After determining Z0, on the basis of failure removal point Tm, to faulted phase current analog signals instantaneous value in time window B
Remain 0 discriminant approach are as follows:
C1, initialization counter 0, for indicating that instantaneous value is continuously less than the number of Z0；
C2, on the basis of failure removal point Tm, in time window B, with 1 millisecond for interval, the electricity of node-by-node algorithm failure phase
Flow field simulation amount signal primitive period component virtual value, if being less than Z0, counter adds 1, otherwise counter clear 0；
If C3, counter are greater than 12, determine to set up, that is, confirm circuit breaker trip, process terminates；
C4, otherwise, in time window B, counter is not more than 12 always, then can confirm that breaker does not trip, to the event
The determination flow of barrier phase terminates；
If there are multiple failure phases for C5, target line, by mutually repeating the above steps, wherein any one phase confirmation road device is jumped
Lock is all considered as effectively, otherwise, can determine that breaker does not trip；
S4, boundary anticipatory method screen fault reference point: determine that route troubles inside the sample space must first establish a fault reference point,
The opportunity range that datum mark is chosen can be from Tn until Tm, ideal to choose opportunity in time window A；
In practical calculating process, the selection of different datum marks, ranging localization result is not also identical, even adjacent moment
The ranging localization result of two datum marks also has notable difference, the discreteness shown, in other words, if fault reference point
Choose unreasonable, ranging localization result gently then causes to generate deviation with practical, it is heavy then beyond total track length, or fall in negative side
To accident is failed to report in initiation；
The improper great risk that may cause is chosen to eliminate fault reference point, herein using the expected screening failure base in boundary
Method on schedule: carrying out ranging localization to sampled points all in time window A first and just calculate, and just calculates result and falls in route starting point to the end two
Within boundary, it is included in the alternative echelon of datum mark, then actuarial is carried out to these alternative points, filters out best fault reference point；
Boundary anticipatory method screens the advantage of fault reference point method clearly, firstly, ensuring all times in the first calculation stage
It selects datum mark that ranging localization result can be made to occur in area, avoids and depend on the ranging localization that single datum mark may cause unduly
Outside to area or the risk of failing to judge of opposite direction, secondly, undoubtedly more approaching to reality failure occurs the result based on the measuring and calculating of multiple datum marks
Position, be conducive to promoted track walker search fault point efficiency；
The measure of boundary anticipatory method screening fault reference point method are as follows:
D1, the first length parameter according to target line, and length unit is kilometer, forward direction amplification extends 10%, reversely puts
Big to extend 2%, the two boundary values establish the effective coverage of ranging localization result；
D2, initialization counter 0, for indicating the datum mark number in alternative echelon；
D3, on the basis of fault moment point Tn, with 1 millisecond for interval in time window A, continuously take and to carry out a ranging localization
Measuring and calculating, if results of measuring falls in effective coverage, counter adds 1；
D4, such as counter reach 10, no longer carry out remaining measuring and calculating, are directly entered step D6；
D5, otherwise, after time window A, counter is less than 3, qualified datum mark number deficiency, and target line excludes, stream
Journey terminates；
If D6, counter are not less than 3, " leaving out the beginning and the end " method is used, maximum value and minimum value in alternative echelon are removed, it is remaining
Lower value is averaged, that is, most ideal measuring and calculating distance；
D7, in each datum mark of alternative echelon, take one closest to ideal measuring and calculating distance to be used as final fault reference point,
Confirm that troubles inside the sample space occurs for target line simultaneously；
It is now based on the above method, the line fault data caused by certain mountain fire carry out ranging localization measuring and calculating, and target line is complete
82.64 kilometers long, corresponding boundary effective coverage is [- 1.65-95.04] kilometer, and it is public that practical line walking prospecting fault point is located at 44.67
In, on the basis of fault moment point Tn, continuous 20 positioning measuring and calculating is carried out for interval with 1 millisecond in time window A, is as a result seen below
Table；
The corresponding ranging localization of different datum marks is apart from computational chart
Remove maximum value 69.27, remove minimum value 43.25, remaining 8 values and be 359.84, average value 44.98,
Alternative datum mark closest to average value is located at Tn+4, therefore Tn+4 is best fault reference point；
S5, the anti-misoperation locking based on the identification of busbar voltage perturbation features: substation's operation maintenance personnel is to protective device, oscillograph
Carry out field experiment it is very common, be likely to occur under putting equipment in service, regular inspection, upgrade and repair situation, test generation
It is extremely similar with true electric network fault data to emulate data, when field test, to prevent from reporting by mistake, protective device can be by throwing on
Soft pressing plate is tested to be latched emulation data, and therefore oscillograph, carrys out recorder data processing then without this kind of soft pressing plate mechanism
It says, the automatic defect preventing locking measure of field simulation failure is extremely important；
Principle: whole group is focused in substation field test, i.e., test objective or is a route or is a mother
Line will not apply fault-signal to a route and a bus simultaneously, actually or it otherwise can not determine that route bus is done
Anticipation reaction is gone out, test objective is not achieved, therefore, in the failure period, only only line current analog signals amplitude becomes
Change and correlated condition amount signal intensity meets fault signature, but the busbar voltage analog signals amplitude mounted does not change
(zero disturbance or not disturbing), principle can recognize accordingly and locking emulates data；
The anti-misoperation locking algorithm identified by the perturbation features to busbar voltage is as follows:
E1, pass through aforementioned bus automatic matching method, filter out the bus that target line is mounted；
E2, on the basis of T0, and T0 is specially first sampling point moment, calculates separately busbar channel A, B, C three-phase electricity
Press primitive period component virtual value Ua, Ub, Uc, i.e., load voltage when bus is normal；
If any one of E3, Ua, Ub, Uc are less than 35V, directly confirmation is emulation data, and anti-misoperation locking is set up, process knot
Beam；
E4, otherwise, on the basis of Tn, in time window A with 1 millisecond for interval, counts A, B, C three-phase voltage channel respectively
Minimum primitive period component virtual value Ua ', Ub ', Uc ', and maximum residual voltage primitive period component virtual value Un '；
E5, Ua "=(Ua '-Ua)/Ua, Ub "=(Ub '-Ub)/Ub, Uc "=(Uc '-Uc)/Uc is set, if | Ua " |, | Ub "
|, | Uc " | any one of more than 3%, can confirm it is non-emulated data, anti-misoperation locking releases, and process terminates；
E6, otherwise can also confirm it is non-emulated data if Un ' is greater than 1.8, and anti-misoperation locking releases, and process terminates；
If E7, E5, E6 cannot release anti-misoperation locking, emulation data can be confirmed as, anti-misoperation locking need to be carried out, must not be missed
Report.
Such as Fig. 2, the principle of fault verification is carried out in engineering application to target line, two conditions need to be met:
1) line fault occurs in area, i.e. the range points of fault localization positioning should be in target line length range, no
It obtains more than overall length or falls in opposite direction (distance values are negative)；
2) circuit breaker trip, route once break down, and action signal, starting open circuit are outputed in the protection that target line is equipped with
Device tripping, cuts off the failure phase load electric current on route；
The judgement of troubles inside the sample space is based on route analog signals feature in recorder data, and the judgement of circuit breaker trip is based on record
The breaker trip condition amount signal displacement that wave number is equipped in for target line.
The relational language paraphrase occurred in text:
T0: the first sampling point moment,
Tn: failure point moment,
Tn+1: 1 millisecond after failure point moment,
Tn+5: 5 milliseconds after failure point moment,
Tn+10: 10 milliseconds after failure point moment,
Tn+15: 15 milliseconds after failure point moment,
Tn+19: 19 milliseconds after failure point moment,
Tb: the protection act moment,
Tc: the circuit breaker trip moment,
Tm: failure removal point moment,
Time window A: fault point and rear 1 cycle, totally 20 milliseconds, fault reference point optimal choice region,
Time window B: failure removal point 3 cycle backward, totally 60 milliseconds, this region load must be reduced to 0.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (1)
1. a kind of accurate determination method of transmission line malfunction based on recorder data, which comprises the steps of:
S1, bus Auto-matching: when transmission line of electricity breaks down, the current value of failure phase short dot be increased dramatically, and voltage value is not
Reduce with degree, short dot is closer apart from oscillograph, and the amplitude that voltage value reduces is bigger, is decayed by voltage value when measuring and calculating failure
Degree, can Auto-matching be out of order the true bus that route mounted, steps are as follows:
The bus that A1, basis initially mount, determines the voltage class of the route, and then filter out all mothers of same voltage class
Line is included in the alternative echelon of bus；
A2, the calculating of voltage attenuation degree is carried out to initial mounting bus, on the basis of T0, and when T0 is specially first sampled point
It carves, calculates separately primitive period component virtual value Ua, Ub, Uc of bus A, B, C three-phase voltage, i.e., load electricity when bus is normal
Pressure；
If any one of A3, Ua, Ub, Uc are less than 35V, the bus is abandoned, carries out next alternative bus matching；
A4, otherwise, on the basis of Tn, and Tn is specially failure point moment, in time window A, is continuously taken a little with 1 millisecond for interval
It calculates, counts the minimum primitive period component virtual value of bus A, B, C three-phase voltage respectively, calculated result is successively denoted as respectively
Ua',Ub',Uc'；
A5, the maximum perturbation ratio for setting bus A phase are denoted as Ua ", and calculation formula is Ua "=(Ua '-Ua)/Ua, bus B phase
Maximum perturbation ratio is denoted as Ub " and calculation formula is Ub "=(Ub '-Ub)/Ub, the maximum perturbation ratio of bus C phase is denoted as Uc ",
Any one of calculation formula is Uc "=(Uc '-Uc)/Uc, if the absolute value of three-phase disturbance ratio, i.e., | Ua " |, | Ub " |, | Uc " |
Not less than 10%, then bus success is matched, process terminates；
A6, otherwise repeats step A2, A3, A4, A5, successively judges alternative echelon's median generatrix, until successful match goes out mother
Line；
If being still unable to successful match after the completion of A7, above-mentioned steps goes out bus, matching initial mounts bus；
S2, zero sequence analog signals reversal connection intelligent recognition and correction: at any time, busbar voltage zero sequence analog signals are instantaneous
Value, is denoted as Un1, then calculation formula is Un1=- | Ua1+Ub1+Uc1 |, line current zero sequence analog signals instantaneous value is denoted as
In1, then calculation formula is In1=| Ia1+Ib1+Ic1 |, wherein the instantaneous value of Ua1 expression bus A phase voltage analog signals,
Ub1 indicates that the instantaneous value of bus B phase voltage analog signals, Uc1 indicate the instantaneous value of bus C phase voltage analog signals；Ia1
Indicate that the instantaneous value of route A phase current analog signals, Ib1 indicate instantaneous value, the Ic1 table of route B phase current analog signals
The instantaneous value of timberline road C phase current analog signals；
It is the unique foundation for determining ground property failure in view of zero sequence analog signals, once there is zero sequence reversal connection, if do not taken
Identification and corrective measure, will result directly in faulty line and fail to judge；
When carrying out target line relevant calculation, on the basis of fault moment Tn, unite in the time window A in first sampling period
The maximum instantaneous value for counting current zero sequence analog signals, when being denoted as the point of at the time of corresponding to In_max and In_max, and calculating this
The sum of punctum A, B, C three-phase current analog signals instantaneous value, is denoted as Iabc, can if In_max is consistent with Iabc sign symbol
Cutoff current zero sequence analog signals channel is not reversely connected, is otherwise considered as reversal connection, if being reversely connected, correction mode is by current zero sequence
Analog signals instantaneous value symbol all negates；
When carrying out the bus relevant calculation of target line mounting, on the basis of fault moment Tn, first sampling period
The maximum instantaneous value of statistics voltage zero sequence analog signals in time window A, at the time of being denoted as corresponding to Un_max and Un_max
The sum of point, and calculate moment point A, B, C three-phase voltage analog signals instantaneous value, it is denoted as Uabc, if Un_max and Uabc are just
Otherwise minus symbol is considered as reversal connection, if being reversely connected, correction side on the contrary, can determine that voltage zero sequence analog signals channel is not reversely connected
Formula is all to negate voltage zero sequence analog signals instantaneous value symbol；
By the reversal connection automatic identification of zero sequence analog signals and correction, it is special to restore the true electric simulation amount signal of fault moment
Sign is cleared away the obstacles for being appropriately determined for target line；
S3, circuit breaker trip is determined using full analog signals:
When line failure, current in the short is increased rapidly, and the protective device being equipped with for the route is caused to act at the Tb moment
And signal is issued, breaker trips after receiving signal at the Tc moment, disjunction short dot, the failure phase after tripping successfully, on route
Load is removed in Tm, electric current be 0 and keep, wherein, Tb be the protection act moment, Tc is the circuit breaker trip moment, Tm be therefore
Barrier excision point moment；
Circuit breaker trip judgement is carried out based on full analog signals, method is that the failure phase of target line is determined in time window B
Whether current analog signal instantaneous value is continuously 0, and determining to set up then indicates circuit breaker trip；
It further include approximation, it is now assumed that the approximation is Z0, the then obtaining value method of Z0 are as follows:
B1, it calculates separately in first record point moment T0 moment target line A, B, C three-phase current analog quantity letter of recorder data
Number primitive period component virtual value, is successively denoted as Ia, Ib, Ic, takes their maximum, be denoted as Imax, is i.e. target line is normal
In the case of maximum phase load electric current；
If B2, Imax are not more than 0.005, Z0=0.002, value process terminates；
B3, otherwise, Z0=Imax/25, if Z0 is not more than 0.01, Z0=0.01；
If B4, Z0 are not less than Imax/3, Z0=Imax/3；
If B5, Z0 are not less than 0.1, Z0=0.1；
After determining Z0, on the basis of failure removal point Tm, to event in the time window B in first sampling period after failure removal
Barrier phase current analog signals instantaneous value remains 0 discriminant approach are as follows:
C1, initialization counter 0, for indicating that instantaneous value is continuously less than the number of Z0；
C2, on the basis of failure removal point Tm, in the time window B in first sampling period after failure removal, be with 1 millisecond
Interval, the current-mode analog quantity signal primitive period component virtual value of node-by-node algorithm failure phase, if being less than Z0, counter adds 1, otherwise
Counter clear 0；
If C3, counter are greater than 12, determine to set up, that is, confirm circuit breaker trip, process terminates；
C4, otherwise, in the time window B in first sampling period after failure removal, counter is not more than 12 always, then can be true
Recognize breaker not trip, the determination flow of the failure phase is terminated；
If there are multiple failure phases for C5, target line, by mutually repeating the above steps, wherein the tripping of any one phase confirmation road device is all
It is considered as effectively, otherwise, can determine that breaker does not trip；
S4, boundary anticipatory method screen fault reference point: determining that route troubles inside the sample space must first establish a fault reference point, benchmark
The opportunity range that point is chosen can be from Tn until Tm, ideal to choose opportunity in time window A；
The measure of boundary anticipatory method screening fault reference point method are as follows:
D1, the first length parameter according to target line, and length unit is kilometer, forward direction amplification extends 10%, and reversely amplification is prolonged
2% is stretched, the two boundary values establish the effective coverage of ranging localization result；
D2, initialization counter 0, for indicating the datum mark number in alternative echelon；
D3, on the basis of fault moment point Tn, with 1 millisecond for interval in time window A, continuously take and to carry out a ranging localization survey
It calculates, if results of measuring falls in effective coverage, counter adds 1；
D4, such as counter reach 10, no longer carry out remaining measuring and calculating, are directly entered step D6；
D5, otherwise, after time window A, counter is less than 3, qualified datum mark number deficiency, and target line excludes, process knot
Beam；
If D6, counter are not less than 3, " leaving out the beginning and the end " method is used, removes maximum value and minimum value in alternative echelon, remainder value
It is averaged, that is, most ideal measuring and calculating distance；
D7, in each datum mark of alternative echelon, take one closest to ideal measuring and calculating distance to be used as final fault reference point, simultaneously
Confirm that troubles inside the sample space occurs for target line；
S5, the anti-misoperation locking based on the identification of busbar voltage perturbation features
The anti-misoperation locking algorithm identified by the perturbation features to busbar voltage is as follows:
E1, pass through aforementioned bus automatic matching method, filter out the bus that target line is mounted；
E2, on the basis of first record point moment T0 of recorder data, calculate separately bus A phase voltage, B phase voltage, C phase voltage
Primitive period component virtual value, calculated result is successively denoted as Ua, Ub, Uc, i.e., load voltage when bus is normal respectively；
If any one of E3, Ua, Ub, Uc are less than 35V, directly confirmation is emulation data, and anti-misoperation locking is set up, and process terminates；
E4, otherwise in the time window A in first sampling period, is connected on the basis of the Tn of fault moment with 1 millisecond for interval
It is continuous to take calculating, the minimum primitive period component virtual value of bus A, B, C three-phase voltage is counted respectively, and calculated result is successively divided
It is not denoted as Ua ', Ub ', Uc '；
E5, the maximum perturbation ratio for setting bus A phase are denoted as Ua ", calculation formula Ua "=(Ua '-Ua)/Ua;Similarly, bus B phase
Maximum perturbation ratio be denoted as Ub ", calculation formula Ub "=(Ub '-Ub)/Ub；The maximum perturbation ratio of bus C phase is denoted as
Uc ", calculation formula Uc "=(Uc '-Uc)/Uc, if three-phase disturbance ratio absolute value, i.e., | Ua " |, | Ub " |, | Uc " | in it is any
One is not less than 10%, then matches bus success, and process terminates；
E6, otherwise can also confirm it is non-emulated data if Un ' is greater than 1.8, and anti-misoperation locking releases, and process terminates；
If E7, E5, E6 cannot release anti-misoperation locking, emulation data can be confirmed as, anti-misoperation locking need to be carried out, must not be reported by mistake.
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| CN111679151B (en) * | 2020-05-27 | 2022-06-21 | 武汉华电顺承科技有限公司 | Synchronous alignment point vector calculation method for double-end distance measurement of wave recording data |
| CN111812455B (en) * | 2020-06-28 | 2022-11-08 | 云南电网有限责任公司 | Power transmission line double-end fault distance measurement method and system |
| CN111751663A (en) * | 2020-06-29 | 2020-10-09 | 深圳供电局有限公司 | Method and system for drawing fault overall process time sequence based on power grid fault recording graph |
| CN112595926A (en) * | 2020-12-10 | 2021-04-02 | 国网河南省电力公司漯河供电公司 | Technical research of intelligent identification and auxiliary compilation of regional power grid maintenance plan |
| CN113241735B (en) * | 2021-05-28 | 2022-06-17 | 广东电网有限责任公司 | 10kV outgoing line backup protection method and system based on station domain information |
| CN114065875B (en) * | 2021-12-02 | 2022-11-11 | 山东石油化工学院 | Power grid fault identification system based on big data |
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