CN105334430A - Single-phase earth fault ranging method and system based on distribution automation system - Google Patents
Single-phase earth fault ranging method and system based on distribution automation system Download PDFInfo
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- CN105334430A CN105334430A CN201510873303.9A CN201510873303A CN105334430A CN 105334430 A CN105334430 A CN 105334430A CN 201510873303 A CN201510873303 A CN 201510873303A CN 105334430 A CN105334430 A CN 105334430A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a single-phase earth fault ranging method based on a distribution automation system. The method includes the steps of collecting zero-sequence voltage and zero-sequence current at the two ends of a distribution line, judging the calculation state according to the zero-sequence voltage and zero-sequence current at the two ends of the distribution line, and calculating fault points of the distribution line according to a line distribution parameter circuit model when the zero-sequence voltage and zero-sequence current at the two ends of the distribution line are detected, when three-phase current and voltage are detected at one end of the distribution line and zero-sequence voltage and zero-sequence current are detected at the other end of the power distribution line and when three-phase current and voltage are detected at one end of the distribution line and no current or voltage is detected at the other end of the distribution line. Application conditions for application of power distribution networks are given through a single-phase earth fault point positioning method; fault ranging conducted under the three conditions is achieved by capturing zero-sequence voltage and zero-sequence current generated instantly when one-phase earthing happens; according to the single-phase earth fault ranging principle based on the line distribution parameter circuit model, only distribution terminals need to be assembled at a main line node and important branch nodes to collect zero-sequence voltage and zero-sequence current of the line.
Description
Technical field
The present invention relates to distribution network line field, particularly a kind of single-phase ground fault distance measuring method based on electrical power distribution automatization system.
Background technology
At present, the fault location device great majority being applied to distribution line are the single end distance measurement devices based on resistance algorithm principle.Under two-side feeding mode, this distance-finding method is comparatively large by the impact of transition resistance in principle, therefore will ensure that good and stable distance accuracy will be very difficult.
Distance accuracy has extremely important meaning in distribution network line fault range finding, and it directly has influence on the length of searching of line fault and time of fixing a breakdown.Distance accuracy is high can shorten emergency repair time, fast recovery of power supply, reduces economic loss.
Therefore, a kind of method of the trouble spot calculated under different faults type condition is needed.
Summary of the invention
Object of the present invention is just to provide a kind of method of the trouble spot calculated under different faults type condition.
The object of the invention is by such technical scheme realize:
A kind of single-phase ground fault distance measuring method based on electrical power distribution automatization system provided by the invention, comprises the following steps:
S1: the residual voltage and the zero-sequence current that gather distribution line two ends;
S2: judge computing mode according to the residual voltage at distribution line two ends and zero-sequence current, when computing mode meets following condition, and carry out line fault search by the mode of following correspondence:
S21: when the zero-sequence current voltage at distribution line two ends being detected, according to the residual voltage v of circuit distributed constant circuit model computational scheme one end
fMwith the residual voltage v of the other end
fN, and search for and residual voltage v on distribution line
fMand v
fNconsistent point is the trouble spot of distribution line;
S22: when detecting that there is three-phase current voltage distribution line one end, when the other end has a zero-sequence current,
Obtain the detection residual voltage V of trouble spot F
f0with detection zero-sequence current i
nF0;
According to the detection residual voltage V of distribution line distributed constant circuit model trouble spot F point
f0with detection zero-sequence current i
nF0calculate the zero-sequence current i of distribution line one end
n0,
By the zero-sequence current i calculated
n0with detection zero-sequence current i
n0compare, if calculate zero-sequence current i
n0with detection zero-sequence current i
n0identical, then trouble spot F is earth fault;
If not identical, return and continue search calculating;
S23: when detecting that there is three-phase current voltage distribution line one end, when the other end is without detection current/voltage,
Calculate trouble spot F point forward-order current i
nF1with forward-order current i
nF2;
Calculate transition resistance Z
fon zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2;
Judge zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2whether equal, if equal, then this point is trouble spot;
If unequal, then return and re-start;
S3: store and export trouble spot.
Further, further comprising the steps of:
As the faulted phase voltage V of trouble spot F
fwhen equalling zero, then faulted phase voltage V
fnull point is trouble spot.
Further, further comprising the steps of:
By obtaining faulted phase voltage V
fwith ground connection transition resistance Z
fon the ground current i that flows through
f0calculate ground connection transition resistance Z
f, compare ground connection transition resistance Z
fchange, obtain the character of singlephase earth fault.
Further, described zero-sequence current i
nF0calculated by following steps:
Represent the instantaneous phase principle of method according to momentary signal sine function, adopt the sine function based on Hilbert transform to represent method, obtain faulted phase voltage v
ft () and M hold the zero-sequence current flow to
sine function represents:
In formula,
expression, ψ
vFt () represents,
represent,
represent, ω gets power frequency angular frequency; By i
nF0carry out sine function expression:
In formula,
be respectively polynomial function; Due to i
f0=i
mF0+ i
nF0, and V
finstantaneous phase and i
f0instantaneous phase is identical, has:
According to above formula, utilize in the time period
ψ
vF(t),
value, application least square method can be asked for
the coefficient of polynomial function;
According to what determine
polynomial function calculates zero-sequence current i
nF0.
Further, the residual voltage at described distribution line two ends and zero-sequence current collection are that acquisition terminal by being arranged at distribution line two ends obtains; Described acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
The invention provides a kind of single-phase ground fault distance measuring system based on electrical power distribution automatization system, comprise power distribution automation main website, communication system and distribution power automation terminal;
Described distribution power automation terminal is arranged at for gathering the electrical quantity at distribution line two ends on distribution line, and described electrical quantity comprises residual voltage and zero-sequence current;
Distribution main website is the upper system of distribution automation system, completes the monitor and forecast to the various online equipment of distribution network systems, and processes the fault that circuit occurs;
The distribution line electrical quantity of distribution terminal collection is uploaded to power distribution automation main website by described communication system; And receive the control command that power distribution automation main website passes down;
The electrical quantity information that described power distribution automation main website reception distribution power automation terminal is uploaded also calculates trouble spot distance on distribution line according to circuit distributed constant circuit model.
Further, the calculating of described trouble spot distance is carried out according to following steps:
S1: the residual voltage and the zero-sequence current that obtain distribution line two ends;
S2: judge computing mode according to the residual voltage at distribution line two ends and zero-sequence current, when computing mode meets following condition, and carry out line fault search by the mode of following correspondence:
S21: when the zero-sequence current voltage at distribution line two ends being detected, according to the residual voltage v of circuit distributed constant circuit model computational scheme one end
fMwith the residual voltage v of the other end
fN, and search for and residual voltage v on distribution line
fMand v
fNconsistent point is the trouble spot of distribution line;
S22: when detecting that there is three-phase current voltage distribution line one end, when the other end has a zero-sequence current,
Obtain the detection residual voltage V of trouble spot F
f0with detection zero-sequence current i
nF0;
According to the detection residual voltage V of distribution line distributed constant circuit model trouble spot F point
f0with detection zero-sequence current i
nF0calculate the zero-sequence current i of distribution line one end
n0,
By the zero-sequence current i calculated
n0with detection zero-sequence current i
n0compare, if calculate zero-sequence current i
n0with detection zero-sequence current i
n0identical, then trouble spot F is earth fault;
If not identical, return and continue search calculating;
S23: when detecting that there is three-phase current voltage distribution line one end, when the other end is without detection current/voltage,
Calculate trouble spot F point forward-order current i
nF1with forward-order current i
nF2;
Calculate transition resistance Z
fon zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2;
Judge zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2whether equal, if equal, then this point is trouble spot;
If unequal, then return and re-start;
S3: store and export trouble spot.
Further, further comprising the steps of:
As the faulted phase voltage V of trouble spot F
fwhen equalling zero, then faulted phase voltage V
fnull point is trouble spot;
By obtaining faulted phase voltage V
fwith ground connection transition resistance Z
fon the ground current i that flows through
f0calculate ground connection transition resistance Z
f, compare ground connection transition resistance Z
fchange, obtain the character of singlephase earth fault;
The residual voltage at described distribution line two ends and zero-sequence current collection are that the acquisition terminal by being arranged at distribution line two ends obtains; Described acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
Further, described zero-sequence current i
nF0calculated by following steps:
Represent the instantaneous phase principle of method according to momentary signal sine function, adopt the sine function based on Hilbert transform to represent method, obtain faulted phase voltage v
ft () and M hold the zero-sequence current flow to
sine function represents:
In formula,
expression, ψ
vFt () represents,
represent,
represent, ω gets power frequency angular frequency; By i
nF0carry out sine function expression:
In formula,
be respectively polynomial function; Due to i
f0=i
mF0+ i
nF0, and V
finstantaneous phase and i
f0instantaneous phase is identical, has:
According to above formula, utilize in the time period
ψ
vF(t),
value, application least square method can be asked for
the coefficient of polynomial function;
According to what determine
polynomial function calculates zero-sequence current i
nF0.
Owing to have employed technique scheme, the present invention has following advantage:
The present invention adopts the theoretical foundation based on the single-phase ground fault distance measuring method of circuit distributed constant circuit model, except circuit distributed constant circuit model, also has the sine function of momentary signal to represent method.To the adaptability of the various singlephase earth faults under different electric network composition, different earthing mode and Different climate condition; To transition resistance (being not less than 2000 Europe), provide the applicable elements of power distribution network application with regard to Single-phase Ground Connection Failure localization method; Three kinds of situation fault localizations are single-phase earthing moment residual voltage and the seizure of zero-sequence current, the scene interference of the voltage and current signal of collection is removed, the correction of current transformer polarity, second and third kind of situation be momentary signal sine function represent ask for, the asking for of the order components electric current of trouble spot offside circuit, the synchronous process also having two check point image data of the second situation.
And Current Distribution Automation terminal can not realize collection and the transmission of the fault characteristic information such as single-phase earthing under different earthed system, causes electrical power distribution automatization system still can not solve well singlephase earth fault orientation problem.
Utilize the single-phase ground fault distance measuring principle based on circuit distributed constant circuit model, only need gather circuit residual voltage, zero-sequence current at basic routing line node and important branch node installing distribution terminal.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be realized by instructions below and claims and be obtained.
Accompanying drawing explanation
Accompanying drawing of the present invention is described as follows.
Fig. 1 is the single-phase ground fault distance measuring method schematic diagram based on electrical power distribution automatization system of the present invention.
Fig. 2 is the zero-sequence network schematic diagram of line single phase grounding failure of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1
As shown in the figure, a kind of single-phase ground fault distance measuring method based on electrical power distribution automatization system that the present embodiment provides, is characterized in that: comprise the following steps:
S1: the residual voltage and the zero-sequence current that gather distribution line two ends;
S2: judge computing mode according to the residual voltage at distribution line two ends and zero-sequence current, when computing mode meets following condition, and carry out line fault search by the mode of following correspondence:
S21: when the zero-sequence current voltage at distribution line two ends being detected, according to the residual voltage v of circuit distributed constant circuit model computational scheme one end
fMwith the residual voltage v of the other end
fN, and search for and residual voltage v on distribution line
fMand v
fNconsistent point is the trouble spot of distribution line;
S22: when detecting that there is three-phase current voltage distribution line one end, when the other end has a zero-sequence current,
Obtain the detection residual voltage V of trouble spot F
f0with detection zero-sequence current i
nF0;
According to the detection residual voltage V of distribution line distributed constant circuit model trouble spot F point
f0with detection zero-sequence current i
nF0calculate the zero-sequence current i of distribution line one end
n0,
By the zero-sequence current i calculated
n0with detection zero-sequence current i
n0compare, if calculate zero-sequence current i
n0with detection zero-sequence current i
n0identical, then trouble spot F is earth fault;
If not identical, return and continue search calculating;
S23: when detecting that there is three-phase current voltage distribution line one end, when the other end is without detection current/voltage,
Calculate trouble spot F point forward-order current i
nF1with forward-order current i
nF2;
Calculate transition resistance Z
fon zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2;
Judge zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2whether equal, if equal, then this point is trouble spot;
If unequal, then return and re-start;
S3: store and export trouble spot.
Further comprising the steps of:
As the faulted phase voltage V of trouble spot F
fwhen equalling zero, then faulted phase voltage V
fnull point is trouble spot.
Further comprising the steps of:
By obtaining faulted phase voltage V
fwith ground connection transition resistance Z
fon the ground current i that flows through
f0calculate ground connection transition resistance Z
f, compare ground connection transition resistance Z
fchange, obtain the character of singlephase earth fault.
Described zero-sequence current i
nF0calculated by following steps:
Represent the instantaneous phase principle of method according to momentary signal sine function, adopt the sine function based on Hilbert transform to represent method, obtain faulted phase voltage v
ft () and M hold the zero-sequence current flow to
sine function represents:
In formula,
expression, ψ
vFt () represents,
represent,
represent, ω gets power frequency angular frequency; By i
nF0carry out sine function expression:
In formula,
be respectively polynomial function; Due to i
f0=i
mF0+ i
nF0, and V
finstantaneous phase and i
f0instantaneous phase is identical, has:
According to above formula, utilize in the time period
ψ
vF(t),
value, application least square method can be asked for
the coefficient of polynomial function;
According to what determine
polynomial function calculates zero-sequence current i
nF0.
The residual voltage at described distribution line two ends and zero-sequence current collection are that the acquisition terminal by being arranged at distribution line two ends obtains; Described acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
A kind of single-phase ground fault distance measuring system based on electrical power distribution automatization system that the present embodiment provides, comprises power distribution automation main website, communication system and distribution power automation terminal;
Described distribution power automation terminal is arranged at for gathering the electrical quantity at distribution line two ends on distribution line, and described electrical quantity comprises residual voltage and zero-sequence current;
Distribution main website is the upper system of distribution automation system, completes the monitor and forecast to the various online equipment of distribution network systems, and processes the fault that circuit occurs;
The distribution line electrical quantity of distribution terminal collection is uploaded to power distribution automation main website by described communication system; And receive the control command that power distribution automation main website passes down;
The electrical quantity information that described power distribution automation main website reception distribution power automation terminal is uploaded also calculates trouble spot distance on distribution line according to circuit distributed constant circuit model.
The calculating of described trouble spot distance is carried out according to following steps:
S1: the residual voltage and the zero-sequence current that obtain distribution line two ends;
S2: judge computing mode according to the residual voltage at distribution line two ends and zero-sequence current, when computing mode meets following condition, and carry out line fault search by the mode of following correspondence:
S21: when the zero-sequence current voltage at distribution line two ends being detected, according to the residual voltage v of circuit distributed constant circuit model computational scheme one end
fMwith the residual voltage v of the other end
fN, and search for and residual voltage v on distribution line
fMand v
fNconsistent point is the trouble spot of distribution line;
S22: when detecting that there is three-phase current voltage distribution line one end, when the other end has a zero-sequence current,
Obtain the detection residual voltage V of trouble spot F
f0with detection zero-sequence current i
nF0;
According to the detection residual voltage V of distribution line distributed constant circuit model trouble spot F point
f0with detection zero-sequence current i
nF0calculate the zero-sequence current i of distribution line one end
n0,
By the zero-sequence current i calculated
n0with detection zero-sequence current i
n0compare, if calculate zero-sequence current i
n0with detection zero-sequence current i
n0identical, then trouble spot F is earth fault;
If not identical, return and continue search calculating;
S23: when detecting that there is three-phase current voltage distribution line one end, when the other end is without detection current/voltage,
Calculate trouble spot F point forward-order current i
nF1with forward-order current i
nF2;
Calculate transition resistance Z
fon zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2;
Judge zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2whether equal, if equal, then this point is trouble spot;
If unequal, then return and re-start;
S3: store and export trouble spot.
Further comprising the steps of:
As the faulted phase voltage V of trouble spot F
fwhen equalling zero, then faulted phase voltage V
fnull point is trouble spot;
By obtaining faulted phase voltage V
fwith ground connection transition resistance Z
fon the ground current i that flows through
f0calculate ground connection transition resistance Z
f, compare ground connection transition resistance Z
fchange, obtain the character of singlephase earth fault;
The residual voltage at described distribution line two ends and zero-sequence current collection are that the acquisition terminal by being arranged at distribution line two ends obtains; Described acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
Described zero-sequence current i
nF0calculated by following steps:
Represent the instantaneous phase principle of method according to momentary signal sine function, adopt the sine function based on Hilbert transform to represent method, obtain faulted phase voltage v
ft () and M hold the zero-sequence current flow to
sine function represents:
In formula,
expression, ψ
vFt () represents,
represent,
represent, ω gets power frequency angular frequency; By i
nF0carry out sine function expression:
In formula,
be respectively polynomial function; Due to i
f0=i
mF0+ i
nF0, and V
finstantaneous phase and i
f0instantaneous phase is identical, has:
According to above formula, utilize in the time period
ψ
vF(t),
value, application least square method can be asked for
the coefficient of polynomial function;
According to what determine
polynomial function calculates zero-sequence current i
nF0.
Embodiment 2
As shown in the figure, a kind of single-phase ground fault distance measuring method based on electrical power distribution automatization system that the present embodiment provides, comprises the following steps:
S1: the residual voltage and the zero-sequence current that gather distribution line two ends;
S2: judge the residual voltage at distribution line two ends and zero-sequence current detected state meet which kind of condition following, and carry out line fault search in the following manner:
S21: when the zero-sequence current voltage at distribution line two ends being detected, according to the residual voltage v of circuit distributed constant circuit model computational scheme any point
fMand v
fN, and search for and residual voltage v on distribution line
fMand v
fNconsistent point is the trouble spot of distribution line;
S22: when detecting that there is three-phase current voltage distribution line one end, when the other end has a zero-sequence current,
Obtain the detection residual voltage V of trouble spot F
f0with detection zero-sequence current i
nF0;
According to the detection residual voltage V of distribution line distributed constant circuit model trouble spot F point
f0with detection zero-sequence current i
nF0calculate the zero-sequence current i of distribution line one end
n0,
By the zero-sequence current i calculated
n0with detection zero-sequence current i
n0compare, if calculate zero-sequence current i
n0with detection zero-sequence current i
n0identical, then trouble spot F is earth fault;
If not identical, return step and continue search calculating.
S23: when detecting that there is three-phase current voltage distribution line one end, when the other end is without detection current/voltage,
Calculate trouble spot F point forward-order current i
nF1with forward-order current i
nF2;
Calculate transition resistance Z
fon zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2;
Judge zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2whether equal, if equal, then this point is trouble spot;
If unequal, then return and re-start;
S3: store and export trouble spot.
Further comprising the steps of:
As the faulted phase voltage V of trouble spot F
fwhen equalling zero, then faulted phase voltage V
fnull point is trouble spot.
Further comprising the steps of:
By obtaining faulted phase voltage V
fwith ground connection transition resistance Z
fon the ground current i that flows through
f0calculate ground connection transition resistance Z
f, compare ground connection transition resistance Z
fchange, obtain the character of singlephase earth fault.
Described zero-sequence current i
nF0calculated by following steps:
Represent the instantaneous phase principle of method according to momentary signal sine function, adopt the sine function based on Hilbert transform to represent method, obtain faulted phase voltage v
fthe zero-sequence current i flow to is held with M
mF0sine function represents:
In formula,
expression, ψ
vFt () represents,
represent,
represent, ω gets power frequency angular frequency; By i
nF0carry out sine function expression, have
In formula,
be respectively polynomial function; Due to i
f0=i
mF0+ i
nF0, and V
finstantaneous phase and i
f0instantaneous phase is identical, has:
According to above formula, utilize in the time period
ψ
vF(t),
value, application least square method can be asked for
the coefficient of polynomial function;
Determine
polynomial function, thereupon i
nF0can ask for.
The residual voltage at described distribution line two ends and zero-sequence current collection are that the acquisition terminal by being arranged at distribution line two ends obtains; Described acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
Embodiment 3
The single-phase ground fault distance measuring method based on electrical power distribution automatization system that the present embodiment provides, wherein, the single-phase ground fault distance measuring principle based on circuit distributed constant circuit model is as follows:
After passing through singlephase earth fault Section Location determination line fault section, single-phase ground fault distance measuring principle based on circuit distributed constant circuit model is divided into three kinds of situations to carry out describing, and is that circuit two ends zero-sequence current voltage detection case, circuit one end three-phase current voltage can detect that the other end only detects zero-sequence current situation, circuit one end three-phase current voltage can detect other end current/voltage all can not detection case respectively.
1) circuit two ends zero-sequence current voltage can detection case
See Fig. 2, from circuit two ends M and N, to set a distance x and l-x, according to the residual voltage v of circuit distributed constant circuit model computational scheme any point
fMand v
fN, searching of line finds residual voltage v
fMand v
fNconsistent point is exactly trouble spot.
2) three-phase current voltage in circuit one end can detect the other end and only detect zero-sequence current situation
Fig. 2 is the zero-sequence network schematic diagram of line single phase grounding failure, and in fig. 2, the distance between M and N of circuit two ends is l, and the distance between check point M and trouble spot F is x, Z
ffor trouble spot ground connection transition resistance.The positive sequence of line single phase grounding failure and negative sequence network also can same way represent.
To set a distance x, held the residual voltage v of residual voltage Current calculation F point by M according to circuit distributed constant circuit model
f0the zero-sequence current i flow to is held with M
mF0, the positive sequence voltage v of sequence and negative sequence voltage Current calculation F point in like manner can be rectified by M
f1with negative sequence voltage v
f2, obtain the faulted phase voltage v of F point
f, owing to there is trouble spot ground connection transition resistance Z
ffor the characteristic of purely resistive, faulted phase voltage v
fphase place and ground connection transition resistance Z
fon the ground current i that flows through
f0same-phase.Ground current i
f0phase place and M hold the zero-sequence current i flow to
mF0phase place is identical, transition resistance Z
fbe stable resistance, just can search for Single-phase Ground Connection Failure according to these two conditions.But, under actual conditions, i
f0phase place and i
mF0phase place is likely inconsistent, even occurs larger gap, Z
falso may not be stable resistance, this just needs to obtain N and holds the zero-sequence current i flow to
nF0, in order to obtain i
nF0, introduce the instantaneous phase principle that momentary signal sine function represents method, think at any one time, the v of trouble spot
finstantaneous phase and v
f0instantaneous phase is identical, with Z
fwhether stable resistance has nothing to do.The sine function applied based on Hilbert transform represents method, can obtain v
fand i
mF0sine function represents, that is:
In formula, Φ (t) V
f, Ψ (t) V
f, Φ (t) i
mF0, Ψ (t) i
mF0unique and known, ω gets power frequency angular frequency.By i
nF0carry out sine function expression, have
In formula, Φ (t)
iMF0, Ψ (t)
iMF0can represent with a polynomial function respectively.Due to i
f0=i
mF0+ i
nF0, and V
finstantaneous phase and i
f0instantaneous phase is identical, has:
According to above formula, utilize Φ (t) V in the time period
f, Ψ (t) V
f, Φ (t) i
mF0, Ψ (t) i
mF0value, application least square method can ask for Φ (t) i
mF0, Ψ (t) i
mF0the coefficient of polynomial function, namely can determine Φ (t) i
mF0, Ψ (t) i
mF0polynomial function, thereupon i
nF0can ask for.
At the residual voltage V of F point
f0with zero-sequence current i
nF0when asking for, according to circuit distributed constant circuit model by F point V
f0and i
nF0calculate the zero-sequence current i of N end
n0, will i be calculated
n0with detection i
n0relatively, the two is consistent, then F point is earth fault; If inconsistent, continue search and calculate.
In earth fault point search process, if above trouble spot condition does not meet the phase voltage V that just breaks down
fnull situation, now faulted phase voltage V
fnull point is exactly trouble spot.
3) circuit one end three-phase current voltage can detect other end current/voltage all can not detection case
See Fig. 2, the now zero-sequence current i of N end
n0can not survey.According to F point zero-sequence current i
nF0acquiring method, with regard to positive sequence and negative sequence network, calculate F point forward-order current i
nF1with forward-order current i
nF2, thus transition resistance Z
fon zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2can ask for, i
f0, i
f1, i
f2equal point is exactly trouble spot, just can search for earth fault according to this range finding condition.
Obtaining faulted phase voltage V
fwith ground connection transition resistance Z
fon the ground current i that flows through
f0, ground connection transition resistance Z
fcan obtain, whereby Z
fchange, the character of singlephase earth fault can be analyzed.
Based on the theoretical foundation of the single-phase ground fault distance measuring method of circuit distributed constant circuit model except circuit distributed constant circuit model, the sine function of momentary signal is also had to represent method.Research to the effect that to the adaptability research of the various singlephase earth faults under different electric network composition, different earthing mode and Different climate condition, the adaptability research to transition resistance (being not less than 2000 Europe), with regard to Single-phase Ground Connection Failure localization method provide power distribution network apply applicable elements; The Major Difficulties common ground of three kinds of situation Research on fault locating is single-phase earthing moment residual voltage and the seizure of zero-sequence current, the scene interference of the voltage and current signal of collection is removed, the correction of current transformer polarity, the Research Challenges of second and third kind of situation be momentary signal sine function represent ask for, the asking for of the order components electric current of trouble spot offside circuit, the Research Challenges of the second situation also has the synchronous process of two check point image data.
2, electrical power distribution automatization system and terminal are layouted
The one-piece construction of electrical power distribution automatization system comprises: power distribution automation main website, communication system and distribution power automation terminal.Distribution main website is the upper system of distribution automation system, completes the monitor and forecast to the various online equipment of distribution network systems, and processes the fault that circuit occurs; Communication system is the mutual platform of main website and distribution terminal system information and tie, is the nerve of whole electrical power distribution automatization system; Distribution power automation terminal gathers to by sensor line electricity tolerance, process and uploads, and monitors controller switching equipment.And Current Distribution Automation terminal can not realize collection and the transmission of the fault characteristic information such as single-phase earthing under different earthed system, causes electrical power distribution automatization system still can not solve well singlephase earth fault orientation problem.
Utilize the single-phase ground fault distance measuring principle based on circuit distributed constant circuit model, only need gather circuit residual voltage, zero-sequence current at basic routing line node and important branch node installing distribution terminal.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of the technical program, it all should be encompassed in the middle of right of the present invention.
Claims (9)
1. based on a single-phase ground fault distance measuring method for electrical power distribution automatization system, it is characterized in that: comprise the following steps:
S1: the residual voltage and the zero-sequence current that gather distribution line two ends;
S2: judge computing mode according to the residual voltage at distribution line two ends and zero-sequence current, when computing mode meets following condition, and carry out line fault search by the mode of following correspondence:
S21: when the zero-sequence current voltage at distribution line two ends being detected, according to the residual voltage v of circuit distributed constant circuit model computational scheme one end
fMwith the residual voltage v of the other end
fN, and search for and residual voltage v on distribution line
fMand v
fNconsistent point is the trouble spot of distribution line;
S22: when detecting that there is three-phase current voltage distribution line one end, when the other end has a zero-sequence current,
Obtain the detection residual voltage v of trouble spot F
f0with detection zero-sequence current i
nF0;
According to the detection residual voltage v of distribution line distributed constant circuit model trouble spot F point
f0with detection zero-sequence current i
nF0calculate the zero-sequence current i of distribution line one end
n0,
By the zero-sequence current i calculated
n0with detection zero-sequence current i
n0compare, if calculate zero-sequence current i
n0with detection zero-sequence current i
n0identical, then trouble spot F is earth fault;
If not identical, return and continue search calculating;
S23: when detecting that there is three-phase current voltage distribution line one end, when the other end is without detection current/voltage,
Calculate trouble spot F point forward-order current i
nF1with forward-order current i
nF2;
Calculate transition resistance Z
fon zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2;
Judge zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2whether equal, if equal, then this point is trouble spot;
If unequal, then return and re-start;
S3: store and export trouble spot.
2., as claimed in claim 1 based on the single-phase ground fault distance measuring method of electrical power distribution automatization system, it is characterized in that: further comprising the steps of:
As the faulted phase voltage v of trouble spot F
fwhen equalling zero, then faulted phase voltage v
fnull point is trouble spot.
3., as claimed in claim 1 based on the single-phase ground fault distance measuring method of electrical power distribution automatization system, it is characterized in that: further comprising the steps of:
By obtaining faulted phase voltage v
fwith ground connection transition resistance Z
fon the ground current i that flows through
f0calculate ground connection transition resistance Z
f, compare ground connection transition resistance Z
fchange, obtain the character of singlephase earth fault.
4., as claimed in claim 1 based on the single-phase ground fault distance measuring method of electrical power distribution automatization system, it is characterized in that: described zero-sequence current i
nF0calculated by following steps:
Represent the instantaneous phase principle of method according to momentary signal sine function, adopt the sine function based on Hilbert transform to represent method, obtain faulted phase voltage v
ft () and M hold the zero-sequence current flow to
sine function represents:
In formula,
expression, ψ
vFt () represents,
represent,
represent, ω gets power frequency angular frequency; By i
nF0carry out sine function expression:
In formula,
be respectively polynomial function; Due to i
f0=i
mF0+ i
nF0, and v
finstantaneous phase and i
f0instantaneous phase is identical, has:
According to above formula, utilize in the time period
ψ
vF(t),
value, application least square method can be asked for
the coefficient of polynomial function;
According to what determine
polynomial function calculates zero-sequence current i
nF0.
5., as claimed in claim 1 based on the single-phase ground fault distance measuring method of electrical power distribution automatization system, it is characterized in that: the residual voltage at described distribution line two ends and zero-sequence current collection are that the acquisition terminal by being arranged at distribution line two ends obtains; Described acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
6. based on a single-phase ground fault distance measuring system for electrical power distribution automatization system, it is characterized in that: comprise power distribution automation main website, communication system and distribution power automation terminal;
Described distribution power automation terminal is arranged at for gathering the electrical quantity at distribution line two ends on distribution line, and described electrical quantity comprises residual voltage and zero-sequence current;
Distribution main website is the upper system of distribution automation system, completes the monitor and forecast to the various online equipment of distribution network systems, and processes the fault that circuit occurs;
The distribution line electrical quantity of distribution terminal collection is uploaded to power distribution automation main website by described communication system; And receive the control command that power distribution automation main website passes down;
The electrical quantity information that described power distribution automation main website reception distribution power automation terminal is uploaded also calculates trouble spot distance on distribution line according to circuit distributed constant circuit model.
7., as claimed in claim 6 based on the single-phase ground fault distance measuring system of electrical power distribution automatization system, it is characterized in that: the calculating of described trouble spot distance is carried out according to following steps:
S1: the residual voltage and the zero-sequence current that obtain distribution line two ends;
S2: judge computing mode according to the residual voltage at distribution line two ends and zero-sequence current, when computing mode meets following condition, and carry out line fault search by the mode of following correspondence:
S21: when the zero-sequence current voltage at distribution line two ends being detected, according to the residual voltage v of circuit distributed constant circuit model computational scheme one end
fMwith the residual voltage v of the other end
fN, and search for and residual voltage v on distribution line
fMand v
fNconsistent point is the trouble spot of distribution line;
S22: when detecting that there is three-phase current voltage distribution line one end, when the other end has a zero-sequence current,
Obtain the detection residual voltage v of trouble spot F
f0with detection zero-sequence current i
nF0;
According to the detection residual voltage v of distribution line distributed constant circuit model trouble spot F point
f0with detection zero-sequence current i
nF0calculate the zero-sequence current i of distribution line one end
n0,
By the zero-sequence current i calculated
n0with detection zero-sequence current i
n0compare, if calculate zero-sequence current i
n0with detection zero-sequence current i
n0identical, then trouble spot F is earth fault;
If not identical, return and continue search calculating;
S23: when detecting that there is three-phase current voltage distribution line one end, when the other end is without detection current/voltage,
Calculate trouble spot F point forward-order current i
nF1with forward-order current i
nF2;
Calculate transition resistance Z
fon zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2;
Judge zero-sequence current i
f0, forward-order current i
f1with negative-sequence current i
f2whether equal, if equal, then this point is trouble spot;
If unequal, then return and re-start;
S3: store and export trouble spot.
8., as claimed in claim 6 based on the single-phase ground fault distance measuring system of electrical power distribution automatization system, it is characterized in that: further comprising the steps of:
As the faulted phase voltage v of trouble spot F
fwhen equalling zero, then faulted phase voltage v
fnull point is trouble spot;
By obtaining faulted phase voltage v
fwith ground connection transition resistance Z
fon the ground current i that flows through
f0calculate ground connection transition resistance Z
f, compare ground connection transition resistance Z
fchange, obtain the character of singlephase earth fault;
The residual voltage at described distribution line two ends and zero-sequence current collection are that the acquisition terminal by being arranged at distribution line two ends obtains; Described acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
9., as claimed in claim 6 based on the single-phase ground fault distance measuring system of electrical power distribution automatization system, it is characterized in that: described zero-sequence current i
nF0calculated by following steps:
Represent the instantaneous phase principle of method according to momentary signal sine function, adopt the sine function based on Hilbert transform to represent method, obtain faulted phase voltage v
ft () and M hold the zero-sequence current flow to
sine function represents:
In formula,
expression, ψ
vFt () represents,
represent,
represent, ω gets power frequency angular frequency; By i
nF0carry out sine function expression:
In formula,
be respectively polynomial function; Due to i
f0=i
mF0+ i
nF0, and v
finstantaneous phase and i
f0instantaneous phase is identical, has:
According to above formula, utilize in the time period
ψ
vF(t),
value, application least square method can be asked for
the coefficient of polynomial function;
According to what determine
polynomial function calculates zero-sequence current i
nF0.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066444A (en) * | 2016-06-14 | 2016-11-02 | 北京鼎科远图科技有限公司 | Ground fault detection device and method based on capacitance partial pressure and big data analysis |
| CN107230970A (en) * | 2016-03-24 | 2017-10-03 | 中国电力科学研究院 | A kind of singlephase earth fault processing method of the feeder automation of type on the spot |
| CN108535597A (en) * | 2018-04-13 | 2018-09-14 | 国网福建省电力有限公司 | Singlephase earth fault Section Location based on circuit model |
| CN111948568A (en) * | 2019-04-30 | 2020-11-17 | 国家电网有限公司 | Power grid line fault processing method based on instantaneous phase consistency |
| CN112698147A (en) * | 2020-12-03 | 2021-04-23 | 国网重庆市电力公司市区供电分公司 | Power line fault point positioning method based on instantaneous phase consistency |
| CN113687267A (en) * | 2021-09-14 | 2021-11-23 | 广东电网有限责任公司 | High-resistance grounding fault direction detection method, system, equipment and storage medium |
| CN113702762A (en) * | 2021-08-27 | 2021-11-26 | 山东科汇电力自动化股份有限公司 | Power distribution network single-phase earth fault distance measurement method using zero sequence information quantity |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080211511A1 (en) * | 2007-01-26 | 2008-09-04 | Myongji University Industry And Academia Cooperation Foundation | Method of Generating Fault Indication in Feeder Remote Terminal Unit for Power Distribution Automation System |
| CN101478149A (en) * | 2009-01-16 | 2009-07-08 | 西安交通大学 | Wire selection method for power distribution network single phase earthing failure based on transient signal |
| CN103245890A (en) * | 2013-05-10 | 2013-08-14 | 国家电网公司 | Line single-phase ground fault single-terminal location method capable of preventing influences of both transitional resistance and load current |
| CN103293442A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Line single-phase earth fault single-terminal location method implemented by aid of zero-sequence voltage distribution characteristics |
| CN103630798A (en) * | 2013-09-12 | 2014-03-12 | 清华大学 | Transmission line single-phase grounding fault single-end ranging method |
| CN104237738A (en) * | 2014-08-29 | 2014-12-24 | 珠海威瀚科技发展有限公司 | Distribution feeder single-phase grounding location system and location method |
-
2015
- 2015-12-02 CN CN201510873303.9A patent/CN105334430B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080211511A1 (en) * | 2007-01-26 | 2008-09-04 | Myongji University Industry And Academia Cooperation Foundation | Method of Generating Fault Indication in Feeder Remote Terminal Unit for Power Distribution Automation System |
| CN101478149A (en) * | 2009-01-16 | 2009-07-08 | 西安交通大学 | Wire selection method for power distribution network single phase earthing failure based on transient signal |
| CN103245890A (en) * | 2013-05-10 | 2013-08-14 | 国家电网公司 | Line single-phase ground fault single-terminal location method capable of preventing influences of both transitional resistance and load current |
| CN103293442A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Line single-phase earth fault single-terminal location method implemented by aid of zero-sequence voltage distribution characteristics |
| CN103630798A (en) * | 2013-09-12 | 2014-03-12 | 清华大学 | Transmission line single-phase grounding fault single-end ranging method |
| CN104237738A (en) * | 2014-08-29 | 2014-12-24 | 珠海威瀚科技发展有限公司 | Distribution feeder single-phase grounding location system and location method |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107230970A (en) * | 2016-03-24 | 2017-10-03 | 中国电力科学研究院 | A kind of singlephase earth fault processing method of the feeder automation of type on the spot |
| CN106066444A (en) * | 2016-06-14 | 2016-11-02 | 北京鼎科远图科技有限公司 | Ground fault detection device and method based on capacitance partial pressure and big data analysis |
| CN108535597A (en) * | 2018-04-13 | 2018-09-14 | 国网福建省电力有限公司 | Singlephase earth fault Section Location based on circuit model |
| CN111948568A (en) * | 2019-04-30 | 2020-11-17 | 国家电网有限公司 | Power grid line fault processing method based on instantaneous phase consistency |
| CN112698147A (en) * | 2020-12-03 | 2021-04-23 | 国网重庆市电力公司市区供电分公司 | Power line fault point positioning method based on instantaneous phase consistency |
| CN112698147B (en) * | 2020-12-03 | 2024-02-06 | 国网重庆市电力公司市区供电分公司 | Power line fault point positioning method based on instantaneous phase consistency |
| CN113702762A (en) * | 2021-08-27 | 2021-11-26 | 山东科汇电力自动化股份有限公司 | Power distribution network single-phase earth fault distance measurement method using zero sequence information quantity |
| CN113702762B (en) * | 2021-08-27 | 2024-04-16 | 山东科汇电力自动化股份有限公司 | Distribution network single-phase earth fault distance measurement method utilizing zero sequence information quantity |
| CN113687267A (en) * | 2021-09-14 | 2021-11-23 | 广东电网有限责任公司 | High-resistance grounding fault direction detection method, system, equipment and storage medium |
| CN113687267B (en) * | 2021-09-14 | 2023-08-04 | 广东电网有限责任公司 | High-resistance ground fault direction detection method, system, equipment and storage medium |
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