CN109470991A - A kind of line fault of electrical power system recognition methods and system - Google Patents

A kind of line fault of electrical power system recognition methods and system Download PDF

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Publication number
CN109470991A
CN109470991A CN201811266569.7A CN201811266569A CN109470991A CN 109470991 A CN109470991 A CN 109470991A CN 201811266569 A CN201811266569 A CN 201811266569A CN 109470991 A CN109470991 A CN 109470991A
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China
Prior art keywords
phase
current
transient current
electric
phase transient
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Pending
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CN201811266569.7A
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Chinese (zh)
Inventor
杨尚瑾
王海龙
李甲飞
王清涛
郑青青
刘向峰
李志伟
喻劲松
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CHINA ELECTRIC PRIME TECHNOLOGY Co Ltd
NARI Group Corp
Original Assignee
CHINA ELECTRIC PRIME TECHNOLOGY Co Ltd
NARI Group Corp
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Priority to CN201811266569.7A priority Critical patent/CN109470991A/en
Publication of CN109470991A publication Critical patent/CN109470991A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/088Aspects of digital computing

Abstract

The present invention provides a kind of line fault of electrical power system recognition methods and system, and method includes the three-phase transient current for obtaining electric system route to be identified;Fault identification is carried out to electric system route to be identified according to the three-phase transient current of electric system route to be identified;Wherein, short-circuit fault of power system identification is realized using instantaneous current value criterion, transient current slope criterion and two-phase transient current difference criterion in recognition methods, solve the problems, such as in the prior art individually it is larger using transient current slope criterion influence from harmonic, using the low problem of transient current slope and instantaneous current value criterion recognition speed;And the method application that the application proposes is simple, is convenient for engineering construction.

Description

A kind of line fault of electrical power system recognition methods and system
Technical field
The invention belongs to electric power system faults to identify field, and in particular to a kind of line fault of electrical power system recognition methods and System.
Background technique
As modern power systems continue to develop, the short circuit current level in power grids at different levels constantly increases, once it is more than disconnected Road device rupturing capacity, consequence are hardly imaginable.Short circuit current excessive problem can be effectively solved using fault current limiter, it is special Point is that zero impedance or Low ESR are presented when power grid operates normally, and is hardly had an impact to system, and in system jam Shi Chengxian high impedance, short circuit current is limited under predetermined value.Quickly inhibit short to give full play to fault current limiter The characteristic of road electric current needs quickly to identify line short fault.
After short trouble occurs, for limiting short-circuit current, need to put into fault current limit in the shortest possible time Device processed, so short trouble fast recognition technology is most important to the realization of fault current limiter function.According to electric system event Service requirement after barrier, when singlephase earth fault occurs, the movement of faulted phase current limiter, non-faulting phase current limiter is not Movement;When multiphase failure occurs for route, the movement of three-phase current limiter.Therefore, the technological difficulties that fault-signal quickly identifies Be accurately need to quickly judge whether line fault occurs, and certain mutually whether be single-phase fault non-faulting phase.In the prior art Using current slope criterion, recognition speed is very fast, but since current slope influence from harmonic is larger, by current slope Identification is matched with current instantaneous value, i.e., when certain phase current slope and current instantaneous value reach setting valve, judges route Break down and think that the non-faulting phase of the Xiang Buwei single-phase fault, such method reduce recognition speed.To improve route event Hinder the rapidity and reliability of identification, it is necessary to further study it.
Summary of the invention
A kind of line fault of electrical power system recognition methods provided by the invention and system, it is therefore an objective in conjunction with circuit on power system Instantaneous current value criterion, transient current slope criterion and two-phase transient current difference criterion realize circuit on power system short trouble Identification.
To achieve the above object, the invention adopts the following technical scheme:
The present invention provides a kind of line fault of electrical power system recognition methods, it is improved in that the described method includes:
Obtain the three-phase transient current of electric system route to be identified;
Failure is carried out to electric system route to be identified according to the three-phase transient current of electric system route to be identified Identification.
Preferably, the three-phase transient current according to electric system route to be identified is to electric system line to be identified Road carries out fault identification, comprising:
If a phase transient current is greater than Fisrt fault identification preset value and described current in current time three-phase transient current A phase transient current meets the first criterion in moment three-phase transient current, then judges line failure to be identified;
If it is pre- to be greater than the second fault identification for the corresponding current slope of a phase transient current in current time three-phase transient current If a phase transient current meets the first criterion in value and the current time three-phase transient current, then judge that route to be identified occurs Failure;
Wherein, the line failure to be identified include this mutually occur two-phase in single-phase fault or three-phase break down or Three-phase breaks down.
Further, first criterion are as follows:
In formula, i1(t)For a phase transient current in current time t three-phase transient current;i1(t-T)For the previous of current time t A phase transient current in a electric system power frequency period T three-phase transient current;i2(t)It is another in current time t three-phase transient current A phase transient current in outer two-phase;i2(t-T)For in the previous electric system power frequency period T three-phase transient current of current time t In addition a phase transient current in two-phase;i3(t)For another phase transient current in two-phase other in current time t three-phase transient current; i3(t-T)It is instantaneously electric for another phase in two-phase other in the previous electric system power frequency period T three-phase transient current of current time t Stream;Iset3For third fault identification preset value.
Further, the Fisrt fault identification preset value is the maximum that the circuit on power system carries busy hour Load current;
The second fault identification preset value is that the circuit on power system carries busy hour maximum load current pair The current slope answered.
Further, the third fault identification preset value is the maximum value in first threshold and second threshold;
Wherein, the first threshold is circuit on power system carrying peak load, and when route generation single-phase fault, In addition the difference of two-phase current time transient current difference and the previous electric system power frequency period transient current difference at current time Maximum value;
When the second threshold is breaker actuation outside the circuit on power system, any two in route three-phase transient current The maximum of the difference of phase current time transient current difference and the previous electric system power frequency period transient current difference at current time Value.
The present invention also provides a kind of line fault of electrical power system identifying systems, it is improved in that the system comprises:
Transient current obtains module, for obtaining the three-phase transient current of electric system route to be identified;
Fault identification module, for being waited for according to the three-phase transient current of electric system route to be identified electric system Identify that route carries out fault identification.
Preferably, the fault identification module includes:
Fisrt fault recognition unit, if being greater than Fisrt fault for a phase transient current in current time three-phase transient current Identify that a phase transient current meets the first criterion in preset value and the current time three-phase transient current, then judges line to be identified It breaks down on road;
Second fault identification unit, if oblique for the corresponding electric current of a phase transient current in current time three-phase transient current Rate is greater than a phase transient current in the second fault identification preset value and the current time three-phase transient current and meets the first criterion, Then judge line failure to be identified;
Wherein, the line failure to be identified include this mutually occur two-phase in single-phase fault or three-phase break down or Three-phase breaks down.
Further, first criterion are as follows:
In formula, i1(t)For a phase transient current in current time t three-phase transient current;i1(t-T)For the previous of current time t A phase transient current in a electric system power frequency period T three-phase transient current;i2(t)It is another in current time t three-phase transient current A phase transient current in outer two-phase;i2(t-T)For in the previous electric system power frequency period T three-phase transient current of current time t In addition a phase transient current in two-phase;i3(t)For another phase transient current in two-phase other in current time t three-phase transient current; i3(t-T)It is instantaneously electric for another phase in two-phase other in the previous electric system power frequency period T three-phase transient current of current time t Stream;Iset3For third fault identification preset value.
Further, the Fisrt fault identification preset value is the maximum that the circuit on power system carries busy hour Load current;
The second fault identification preset value is that the circuit on power system carries busy hour maximum load current pair The current slope answered.
Further, the third fault identification preset value is the maximum value in first threshold and second threshold;
Wherein, the first threshold is circuit on power system carrying peak load, and when route generation single-phase fault, In addition the difference of two-phase current time transient current difference and the previous electric system power frequency period transient current difference at current time Maximum value;
When the second threshold is breaker actuation outside the circuit on power system, any two in route three-phase transient current The maximum of the difference of phase current time transient current difference and the previous electric system power frequency period transient current difference at current time Value.
It is compared with the immediate prior art, the technical scheme provide by that invention has the following excellent effect:
The present invention provides a kind of line fault of electrical power system recognition methods and system, by using instantaneous current value criterion, Transient current slope criterion and two-phase transient current difference criterion realize short-circuit fault of power system identification, solve in the prior art The problem that transient current slope criterion influence from harmonic is larger, transient current slope and instantaneous current value criterion recognition speed are low, And the present processes application is simple, is convenient for engineering construction.
Detailed description of the invention
Fig. 1 is electric power system fault recognition methods flow chart of the present invention;
Fig. 2 is electric power system fault identifying system structural schematic diagram of the present invention.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
The present invention provides a kind of line fault of electrical power system recognition methods as shown in Figure 1, which comprises
Step 1, the three-phase transient current for obtaining electric system route to be identified;
Step 2, according to the three-phase transient current of electric system route to be identified to electric system route to be identified into Row fault identification.
In the method described in step 2 according to the three-phase transient current of electric system route to be identified to electric system Route to be identified carries out fault identification, comprising:
If a phase transient current is greater than Fisrt fault identification preset value and described current in current time three-phase transient current A phase transient current meets the first criterion in moment three-phase transient current, then judges line failure to be identified;
If it is pre- to be greater than the second fault identification for the corresponding current slope of a phase transient current in current time three-phase transient current If a phase transient current meets the first criterion in value and the preceding moment three-phase transient current, then judge that event occurs for route to be identified Barrier;
Wherein, the line failure to be identified include this mutually occur two-phase in single-phase fault or three-phase break down or Three-phase breaks down.
Wherein, first criterion are as follows:
In formula, i1(t)For a phase transient current in current time t three-phase transient current;i1(t-T)For the previous of current time t A phase transient current in a electric system power frequency period T three-phase transient current;i2(t)It is another in current time t three-phase transient current A phase transient current in outer two-phase;i2(t-T)For in the previous electric system power frequency period T three-phase transient current of current time t In addition a phase transient current in two-phase;i3(t)For another phase transient current in two-phase other in current time t three-phase transient current; i3(t-T)It is instantaneously electric for another phase in two-phase other in the previous electric system power frequency period T three-phase transient current of current time t Stream;Iset3For third fault identification preset value.
In 2 specific method of above-mentioned steps, the Fisrt fault identification preset value, the second fault identification preset value and third event Barrier identification preset value is arranged according to the historical data of electric system route to be identified, specifically:
The Fisrt fault identification preset value is the maximum load current that the circuit on power system carries busy hour; The second fault identification preset value is that the circuit on power system carries the corresponding electric current of busy hour maximum load current Slope;The third fault identification preset value is the maximum value in first threshold and second threshold;Wherein, the first threshold is The circuit on power system carries peak load, and when route generation single-phase fault, in addition two-phase current time transient current is poor With the maximum value of the difference of the previous electric system power frequency period transient current difference at current time;The second threshold is described When the outer breaker actuation of circuit on power system, any two-phase current time transient current difference and current in route three-phase transient current The maximum value of the difference of the previous electric system power frequency period transient current difference at moment.
The present invention also provides a kind of line fault of electrical power system identifying system as shown in Figure 2, the system comprises:
Transient current obtains module, for obtaining the three-phase transient current of electric system route to be identified;
Fault identification module, for being waited for according to the three-phase transient current of electric system route to be identified electric system Identify that route carries out fault identification.
Fault identification module in the system includes:
Fisrt fault recognition unit, if being greater than Fisrt fault for a phase transient current in current time three-phase transient current Identify that a phase transient current meets the first criterion in preset value and the current time three-phase transient current, then judges line to be identified It breaks down on road;
Second fault identification unit, if oblique for the corresponding electric current of a phase transient current in current time three-phase transient current Rate is greater than a phase transient current in the second fault identification preset value and the preceding moment three-phase transient current and meets the first criterion, then Judge line failure to be identified;
Wherein, the line failure to be identified include this mutually occur two-phase in single-phase fault or three-phase break down or Three-phase breaks down.
First criterion are as follows:
In formula, i1(t)For a phase transient current in current time t three-phase transient current;i1(t-T)For the previous of current time t A phase transient current in a electric system power frequency period T three-phase transient current;i2(t)It is another in current time t three-phase transient current A phase transient current in outer two-phase;i2(t-T)For in the previous electric system power frequency period T three-phase transient current of current time t In addition a phase transient current in two-phase;i3(t)For another phase transient current in two-phase other in current time t three-phase transient current; i3(t-T)It is instantaneously electric for another phase in two-phase other in the previous electric system power frequency period T three-phase transient current of current time t Stream;Iset3For third fault identification preset value.
Fisrt fault identification preset value, the second fault identification preset value and third event in above-mentioned fault identification unit Barrier identification preset value is arranged according to the historical data of electric system route to be identified, specifically:
The Fisrt fault identification preset value is the maximum load current that the circuit on power system carries busy hour; The second fault identification preset value is that the circuit on power system carries the corresponding electric current of busy hour maximum load current Slope;The third fault identification preset value is the maximum value in first threshold and second threshold;Wherein, the first threshold is The circuit on power system carries peak load, and when route generation single-phase fault, in addition two-phase current time transient current is poor With the maximum value of the difference of the previous electric system power frequency period transient current difference at current time;The second threshold is described When the outer breaker actuation of circuit on power system, any two-phase current time transient current difference and current in route three-phase transient current The maximum value of the difference of the previous electric system power frequency period transient current difference at moment.
In conclusion the present invention provides a kind of line fault of electrical power system recognition methods and system, method includes obtaining electricity The three-phase transient current of Force system route to be identified;According to the three-phase transient current of electric system route to be identified to electric power System route to be identified carries out fault identification;Wherein, instantaneous current value criterion, transient current slope criterion are used in recognition methods Short-circuit fault of power system identification is realized with two-phase transient current difference criterion, is solved in the prior art individually using transient current The larger problem of slope criterion influence from harmonic is asked using transient current slope and instantaneous current value criterion recognition speed are low Topic;And the method application that the application proposes is simple, is convenient for engineering construction.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute The those of ordinary skill in category field is although should be understood with reference to the above embodiments: still can be to a specific embodiment of the invention It is modified or replaced equivalently, these are without departing from any modification of spirit and scope of the invention or equivalent replacement, in Shen Within claims of the invention that please be pending.

Claims (10)

1. a kind of line fault of electrical power system recognition methods, which is characterized in that the described method includes:
Obtain the three-phase transient current of electric system route to be identified;
Fault identification is carried out to electric system route to be identified according to the three-phase transient current of electric system route to be identified.
2. the method as described in claim 1, which is characterized in that the three-phase wink according to electric system route to be identified When electric current to electric system route to be identified carry out fault identification, comprising:
If a phase transient current is greater than Fisrt fault identification preset value and the current time in current time three-phase transient current A phase transient current meets the first criterion in three-phase transient current, then judges line failure to be identified;
If the corresponding current slope of a phase transient current is greater than the second fault identification preset value in current time three-phase transient current And a phase transient current meets the first criterion in the current time three-phase transient current, then judges that event occurs for route to be identified Barrier;
Wherein, the line failure to be identified includes that this mutually occurs two-phase in single-phase fault or three-phase and breaks down or three-phase Break down.
3. method according to claim 2, which is characterized in that first criterion are as follows:
In formula, i1(t)For a phase transient current in current time t three-phase transient current;i1(t-T)For the previous electricity of current time t A phase transient current in Force system power frequency period T three-phase transient current;i2(t)It is in current time t three-phase transient current other two Xiang Zhongyi phase transient current;i2(t-T)For in the previous electric system power frequency period T three-phase transient current of current time t in addition A phase transient current in two-phase;i3(t)For another phase transient current in two-phase other in current time t three-phase transient current; i3(t-T)It is instantaneously electric for another phase in two-phase other in the previous electric system power frequency period T three-phase transient current of current time t Stream;Iset3For third fault identification preset value.
4. method according to claim 2, which is characterized in that the Fisrt fault identification preset value is the electric system line The maximum load current of road carrying busy hour;
The second fault identification preset value is that circuit on power system carrying busy hour maximum load current is corresponding Current slope.
5. method as claimed in claim 3, which is characterized in that the third fault identification preset value is first threshold and second Maximum value in threshold value;
Wherein, the first threshold is circuit on power system carrying peak load, and when route generation single-phase fault, in addition The difference of two-phase current time transient current difference and the previous electric system power frequency period transient current difference at current time is most Big value;
When the second threshold is breaker actuation outside the circuit on power system, any two quite in route three-phase transient current The maximum value of the difference of preceding moment transient current difference and the previous electric system power frequency period transient current difference at current time.
6. a kind of line fault of electrical power system identifying system, which is characterized in that the system comprises:
Transient current obtains module, for obtaining the three-phase transient current of electric system route to be identified;
Fault identification module, it is to be identified to electric system for the three-phase transient current according to electric system route to be identified Route carries out fault identification.
7. system as claimed in claim 6, which is characterized in that the fault identification module includes:
Fisrt fault recognition unit, if being identified for a phase transient current in current time three-phase transient current greater than Fisrt fault A phase transient current meets the first criterion in preset value and the current time three-phase transient current, then judges route hair to be identified Raw failure;
Second fault identification unit, if big for the corresponding current slope of a phase transient current in current time three-phase transient current A phase transient current meets the first criterion in the second fault identification preset value and the current time three-phase transient current, then sentences Break line failure to be identified;
Wherein, the line failure to be identified includes that this mutually occurs two-phase in single-phase fault or three-phase and breaks down or three-phase Break down.
8. system as claimed in claim 7, which is characterized in that first criterion are as follows:
In formula, i1(t)For a phase transient current in current time t three-phase transient current;i1(t-T)For the previous electricity of current time t A phase transient current in Force system power frequency period T three-phase transient current;i2(t)It is in current time t three-phase transient current other two Xiang Zhongyi phase transient current;i2(t-T)For in the previous electric system power frequency period T three-phase transient current of current time t in addition A phase transient current in two-phase;i3(t)For another phase transient current in two-phase other in current time t three-phase transient current; i3(t-T)It is instantaneously electric for another phase in two-phase other in the previous electric system power frequency period T three-phase transient current of current time t Stream;Iset3For third fault identification preset value.
9. system as claimed in claim 7, which is characterized in that the Fisrt fault identification preset value is the electric system line The maximum load current of road carrying busy hour;
The second fault identification preset value is that circuit on power system carrying busy hour maximum load current is corresponding Current slope.
10. system as claimed in claim 8, which is characterized in that the third fault identification preset value is first threshold and the Maximum value in two threshold values;
Wherein, the first threshold is circuit on power system carrying peak load, and when route generation single-phase fault, in addition The difference of two-phase current time transient current difference and the previous electric system power frequency period transient current difference at current time is most Big value;
When the second threshold is breaker actuation outside the circuit on power system, any two quite in route three-phase transient current The maximum value of the difference of preceding moment transient current difference and the previous electric system power frequency period transient current difference at current time.
CN201811266569.7A 2018-10-29 2018-10-29 A kind of line fault of electrical power system recognition methods and system Pending CN109470991A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111999677A (en) * 2020-10-28 2020-11-27 江苏智臻能源科技有限公司 Indoor and outdoor short circuit identification method based on meter box monitoring terminal and intelligent electric meter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111999677A (en) * 2020-10-28 2020-11-27 江苏智臻能源科技有限公司 Indoor and outdoor short circuit identification method based on meter box monitoring terminal and intelligent electric meter

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