CN102411117A - Method for positioning short-circuit fault of distribution network based on distributed intelligent multi-calibration - Google Patents
Method for positioning short-circuit fault of distribution network based on distributed intelligent multi-calibration Download PDFInfo
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- CN102411117A CN102411117A CN2011102270406A CN201110227040A CN102411117A CN 102411117 A CN102411117 A CN 102411117A CN 2011102270406 A CN2011102270406 A CN 2011102270406A CN 201110227040 A CN201110227040 A CN 201110227040A CN 102411117 A CN102411117 A CN 102411117A
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Abstract
The invention relates to a method for positioning a short-circuit fault of a distribution network based on distributed intelligent multi-calibration. The method comprises the following steps of: arranging a plurality of intelligent agents in the distribution network and establishing a modeled multilevel multi-verification short-circuit fault positioning rule for different operating modes of the distribution network; in the operation process of the distribution network, monitoring operation information of a local current distribution network in real time through each distributed intelligent agent; once the current is out of limit, sending a current out-of-limit signal to the directly-adjacent intelligent agent and a superior intelligent agent and checking whether a short-circuit fault early-warning signal exists locally; if so, assuring that the short-circuit fault happens locally; otherwise, waiting for receiving the current out-of-limit signal sent by the directly-adjacent intelligent agent; and after delaying the signal for time t, according to the local current out-of-limit signal and the received current out-of-limit signal, carrying out rule matching and multi-condition calibration to determine a fault diagnosis result by utilizing a local short-circuit fault positioning rule library and combining a wiring type of the distribution network and the position of the intelligent agent.
Description
Technical field
The invention belongs to the Power System and its Automation field, be specifically related to a kind of short circuit fault of power distribution network localization method based on the multiple calibration of distributed intelligence.
Background technology
As the most common failure in the power distribution network, short trouble then might cause major accidents such as equipment burnout, load dead electricity as not locating as early as possible and isolating.
At present, short trouble relies on protection and isolating switch in the power distribution network to realize the location and isolate mostly.This method not only receives the restriction of breaker acting speed, and protection and isolating switch are prone to the phenomenon of malfunction, tripping.Simultaneously, the dead electricity scope is excessive, is positioned at the short trouble on the track section, after the protection action is isolated, tends to cause the dead electricity on the whole piece circuit.In addition, in the power distribution network of multiple feed, the definite value of protective device with cooperate more complicatedly, be difficult to realize the accurate location and the isolation of short trouble.
Distributed intelligence can effectively be simplified challenge as emerging technology, satisfies online in real time property, robotization and intelligentized requirement.The fault diagnosis that is used for electrical network; Can realize the local processing of local information, rely on mechanics of communication, can realize the interactive communication between the intelligent body; Cooperate than the original protection of electrical network; Not only processing speed is fast, and the formulation of judgment rule, revises with additional more flexible, is applicable to the multiple power distribution network method of operation.Simultaneously, simplified protection problem such as adjust greatly.In addition, only the boundary switch of action failure section has been dwindled the power failure scope, has improved the accuracy and the reliability of localization of fault.
Based on the short trouble localization method of distributed intelligence, at present domestic existing a small amount of research.Some documents are studied the distribution network failure self-healing control technology based on distributed intelligence; Open loop and operation with closed ring electrical power distribution network fault location method have been proposed; This method comprises following content: (1) is for the open loop power distribution network; If a certain fault current that surpasses setting valve that flow through mutually of a switch, then its intelligent electronic device sends the information that flows through fault current to the intelligent electronic device and the station level equipment of its adjacent switch; If a distribution zone has and has only 1 end points to report and flow through fault current, then fault occurs in this distribution intra-zone; Otherwise fault does not just occur in this distribution intra-zone.(2) for the closed loop power distribution network, if a certain fault current that surpasses setting valve that flow through mutually of a switch, then its intelligent electronic device sends failure message to the intelligent electronic device and the station level equipment of its adjacent switch, the direction of information content reflection fault power.For a distribution zone, if the fault power direction that its end points reports is all pointed to this intra-zone, then fault occurs in this distribution intra-zone; If the fault power direction that a certain end points reports is pointed to this region exterior or its all end points all do not report failure message, then just there is not fault in this distribution zone.
Above-mentioned short trouble localization method based on distributed intelligence can correctly carry out localization of fault in theory.But under the actual motion environment, might judge by accident; Need wait for the information that adjacent intelligent body sends simultaneously, the time is longer relatively, has influenced promptness, the accuracy of localization of fault to a certain extent.
Summary of the invention
The present invention seeks to problem to erroneous judgement, promptness and the accuracy of above-mentioned distributed intelligence localization of fault existence; And consider the influence of different powering modes; A kind of short circuit fault of power distribution network localization method based on the multiple calibration of distributed intelligence has been proposed; The method that this method utilizes early warning information or increase verification condition to carry out localization of fault can improve promptness, the accuracy of localization of fault, and can reduce the erroneous judgement probability.
The objective of the invention is to adopt following technical proposals to realize:
A kind of short circuit fault of power distribution network localization method based on the multiple calibration of distributed intelligence, its improvements are that said method is utilized early warning information or increased the verification condition and carries out localization of fault; Said method comprises the steps:
(1) intelligent body is set in said power distribution network;
(2) set up the multi-level many verifications short trouble of medelling locating rule storehouse;
(3) said intelligent body is monitored this vagabond current in the said power distribution network operational process and voltage power distribution network operation information in real time, if this vagabond current is out-of-limit, then gets into step (4); Otherwise, continue circulation and carry out this step;
(4) said intelligent body sends the out-of-limit signal of electric current to direct neighbor intelligence body and higher level's intelligence body;
(5) check whether this locality has the short trouble early warning signal,, then confirm local failed because if having; If no, then carry out step (6);
(6) wait for the out-of-limit signal of electric current that receives the transmission of said direct neighbor intelligence body, get into step (7) behind the delay time t;
(7) carry out the calibration of rule match and multiple condition, diagnostic reasoning; Said rule condition coupling comprises: utilize said short trouble locating rule storehouse, in conjunction with said power distribution network wiring type and said intelligent body present position with according to the out-of-limit signal of electric current local and that receive;
(8) confirm diagnostic result.
A kind of optimized technical scheme provided by the invention is: described in the said step (1) in the power distribution network position that is provided with of intelligent body comprise:
Locate at a certain distance on A, the circuit, the liaison office of different circuit;
B, circuit branch;
C, distribution substation/distribute-electricity transformer district;
D, ring main unit/switching station/cable distribution box;
E, distributed power source and site;
F, user access point;
The function that said intelligent body possesses comprises that program run, data storage, electric parameters detect and information communication.
Second optimized technical scheme provided by the invention is: set up the multi-level many verifications short trouble of medelling locating rule storehouse described in the said step (2) and comprise the method for operation to power distribution network, set up said short trouble locating rule storehouse;
The said power distribution network method of operation comprises the open loop method of operation and operation with closed ring mode; The said open loop method of operation is the radial power system operating mode of single supply; Said operation with closed ring mode is that the N power supply is simultaneously to the method for operation of a mains supply;
In the power distribution network with the said open loop method of operation, end points is the residing position of intelligent body in the said power distribution network; Said end points is divided into section with circuit; Said end points is in the link position of section and section; Said section is the base unit that constitutes circuit; According to the end points number of said section, be divided into single-ended section, both-end section, three end section and four end section with the section in the open loop method of operation power distribution network with said.
The 3rd optimized technical scheme provided by the invention is: the said mode of rule that comprises section level, end points level and circuit hierarchy with the short circuit fault of power distribution network locating rule pattern of the open loop method of operation; The mode of rule of said section level comprises single-ended range mode, both-end range mode, three end section patterns and four end section patterns; Wherein, the rule condition of section level comprises pacing items and verification condition; The rule condition of end points level and circuit hierarchy comprises pacing items.
The 4th optimized technical scheme provided by the invention is: in the power distribution network with the operation with closed ring mode, end points is the residing position of intelligent body in the said power distribution network; Said end points is divided into section with circuit; Said end points is in the link position of section and section; Said section is the base unit that constitutes circuit; According to the end points number and the present position of said section, be divided into both-end section on single-ended section, the backbone, the both-end section on the branch line, three end section on the full backbone, three end section on half backbone, three end section on the branch line, four end section on the full backbone, four end section on three backbones, four end section and four end section on the branch line on two backbones with the section in the power distribution network of operation with closed ring mode with said.
The 5th optimized technical scheme provided by the invention is: the said mode of rule that comprises section level, end points level and circuit hierarchy with the short circuit fault of power distribution network locating rule pattern of operation with closed ring mode; The mode of rule of said section level comprises four end section patterns, four end section patterns on three backbones, four end section patterns on two backbones and the four end section patterns on the branch line on three end section patterns on both-end range mode on single-ended range mode, the backbone, the both-end range mode on the branch line, the full backbone, three end section patterns on half backbone, three end section patterns on the branch line, the full backbone; Wherein, the rule condition of section level comprises pacing items and verification condition or comprises pacing items; The rule condition of end points level and circuit hierarchy comprises pacing items.
The 6th optimized technical scheme provided by the invention is: in the said step (4), the intelligent body of said direct neighbor is meant that two intelligence place end points link to each other through lead, and other intelligent body of nothing is separated by between the two intelligent bodies.
The 7th optimized technical scheme provided by the invention is: in the said step (7), said diagnostic reasoning is followed following requirement:
1. the rule of not having calibration condition for only pacing items being arranged as long as actual conditions satisfy all pacing itemss, can be confirmed the conclusion establishment;
The rule that 2. calibration condition is arranged again for existing pacing items, if actual conditions satisfy all pacing itemss and satisfy at least one calibration condition, then conclusion is set up;
3. for described rule,, can confirm that conclusion is false if actual conditions do not satisfy pacing items;
The rule that 4. calibration condition is arranged again for existing pacing items, if actual conditions satisfy whole pacing itemss, and all calibration conditions all do not satisfy, then conclusion possibly set up.
The 8th optimized technical scheme provided by the invention is: in the said step (8), said diagnostic result comprises:
Whether each section that a, said intelligent body connected two phase or three phase short circuit fault take place;
Whether each section that b, said intelligent body connected two phase or three phase short circuit fault possibly take place;
Whether c, said intelligent body are 2 phase or three phase short circuit fault points;
D, said two phases or three phase short circuit fault point are positioned at the upper reaches or the downstream end points place of fault section;
Whether subordinate's electrical network of e, said intelligent body place section two phase or three phase short circuit fault take place;
Whether f, said intelligent body feeder line of living in are two phase or three phase short circuit fault feeder lines.
Compared with prior art, the beneficial effect that reaches of the present invention is:
1, the short circuit fault of power distribution network localization method based on the multiple calibration of distributed intelligence provided by the invention utilizes fault pre-alarming information, realizes confirming fast of fault;
2, method provided by the invention is based on the distributed intelligence body, and local information is local to be handled, and diagnosis speed is fast;
3, the present invention utilizes the Rulemaking method of medelling, and it is reliable comprehensively to handle problems;
4, method provided by the invention has realized the localization of fault of section level, dwindles the power failure scope, diagnoses more accurate;
5, method provided by the invention adopts the Rulemaking mode of multiple calibration, has avoided the switch malfunction;
6, method provided by the invention can be carried out the accident of subordinate's electrical network and judge except that the diagnosis of this locality, is easy to realize multi-stage protection, is desirable short trouble localization method.
Description of drawings
Fig. 1 is the short circuit fault of power distribution network localization method process flow diagram based on the many calibrations of distributed intelligence provided by the invention;
Fig. 2 is the short trouble localization method example structure synoptic diagram that the present invention is used for typical power distribution network.
Embodiment
Do further detailed description below in conjunction with the accompanying drawing specific embodiments of the invention.
The present invention is used for handling the short trouble of power distribution network.A plurality of intelligent bodies are set in power distribution network, and each intelligent body possesses functions such as program run, data storage, electric parameters detection, information communication.To the multiple method of operation of power distribution network,, set up the multi-level many verifications short trouble of medelling locating rule based on section, end points and circuit types of objects.In the power distribution network operational process; Each distributed intelligence body is monitored operation of power networks information such as this vagabond current, voltage in real time, in case electric current, voltage etc. are out-of-limit; Then send the out-of-limit signal of electric current and voltage to direct neighbor intelligence body and higher level's intelligence body; And check whether this locality has the short trouble early warning signal, if having, can confirm local failed because.If there is not the short trouble early warning signal, then wait for to receive out-of-limit signals such as electric current that direct neighbor intelligence body sends, voltage, delay time t (scope of t is 5-50ms).Afterwards, utilize local short trouble locating rule storehouse,,, carry out the condition coupling and the multiple condition calibration of rule, confirm fault diagnosis result according to out-of-limit signals such as local and the electric current that receives, voltages in conjunction with power distribution network wiring type and should intelligence body present position.Diagnostic result comprises; Whether each section that this intelligence body is connected two phase or three phase short circuit fault take place; This intelligence body is positioned at the upper reaches or the downstream position of short trouble section, and whether subordinate's electrical network of this intelligence body place section two phases or three phase short circuit fault etc. take place.
Fig. 1 is the short circuit fault of power distribution network localization method process flow diagram of the many calibrations based on distributed intelligence provided by the invention; As shown in Figure 1, the present invention realizes through following technical scheme, comprises the steps:
(1) a plurality of intelligent bodies are set in power distribution network, each intelligent body possesses program run, data storage, electric parameters detects and the function of information communication.
The position that is provided with of intelligent body includes but not limited to following place in the power distribution network:
Locate at a certain distance on A, the circuit, the liaison office of different circuit;
B, circuit branch;
C, distribution substation/distribute-electricity transformer district;
D, ring main unit/switching station/cable distribution box;
E, distributed power source and site;
F, user access point.
(2) set up the multi-level many verifications short trouble of medelling locating rule;
This rule base comprises following content:
The power distribution network method of operation can be divided into two kinds, and a kind of is the open loop method of operation, i.e. the radial power system operating mode of single supply; A kind of is the operation with closed ring mode, and promptly N (N >=2) power supply is simultaneously to the method for operation of a mains supply; Need to set up different short trouble locating rules to the different power distribution network methods of operation.
One type: for power distribution network with the open loop approach operation
End points is the residing position of intelligent body in the electrical network.End points is divided into some sections with circuit, itself is in the link position of section and section.
Section is the base unit that constitutes circuit.According to the end points number, can the section in the power distribution network be divided into four kinds of typical modules such as single-ended section, both-end section, three end section, four end section.N (N >=3) end section is made up of N bar branch line, the branch line in the corresponding section of each end points.Circuit is connected to form by section and section.
Short circuit fault of power distribution network locating rule with the operation of the open loop method of operation includes but not limited to following mode of rule:
1) section level
A) single-ended range mode
Rule one:
Pacing items: this section end points two phases (being made as A, B phase) electric current is got over the upper limit, and third phase (being made as the C phase) electric current is not got over the upper limit;
The verification condition: upper reaches terminal A, the B phase current of upper reaches adjacent sections are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items: this section end points three-phase current is got over the upper limit;
The verification condition: the upper reaches end points three-phase current of upper reaches adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
B) both-end range mode
Rule one:
Pacing items: this section upper reaches end points two phases (being made as A, B phase) electric current is got over the upper limit, and third phase (being made as the C phase) electric current is the upper limit more, and the downstream end points is not circulated a notice of three-phase current and got over the upper limit;
Verification condition one: upper reaches end points or downstream terminal A, B voltage between phases approach 0, and all the other voltages between phases are normal;
Verification condition two: upper reaches terminal A, the B phase current of upper reaches adjacent sections are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items: this section upper reaches end points three-phase current is got over the upper limit, and downstream end points three-phase current is not got over the upper limit;
Verification condition one: upstream and downstream two-end-point three-phase voltage between phases all approaches 0;
Verification condition two: the upper reaches end points three-phase current of upper reaches adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
C) three end section patterns
Rule one:
Pacing items: this section upper reaches end points two phases (being made as A, B phase) electric current is got over the upper limit, and third phase (being made as the C phase) electric current is got over the upper limit, and the three-phase current of two downstream end points is all got over the upper limit;
A, the B voltage between phases of one: three end points of verification condition approach 0, and all the other voltages between phases are normal;
Verification condition two: upper reaches terminal A, the B phase current of upper reaches adjacent sections are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items: this section upper reaches end points three-phase current is got over the upper limit, and the three-phase current of two downstream end points is not all got over the upper limit;
The three-phase voltage between phases of one: three end points of verification condition approaches 0;
Verification condition two: the upper reaches end points three-phase current of upper reaches adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
Rule three:
Pacing items: this section upper reaches end points two phases (being made as A, B phase) electric current is got over the upper limit; Third phase (being made as the C phase) electric current is not got over the upper limit; And the downstream end points three-phase current on this section backbone is not all got over the upper limit; And downstream terminal A, B phase current on this section branch line are got over the upper limit, and the C phase current is not out-of-limit.
Conclusion: this section is failed because not, and A takes place on the branch line that this section is drawn, the B two-phase short-circuit fault.
Rule four:
Pacing items: this section upper reaches end points three-phase current is got over the upper limit, and the equal upper limit more of the downstream end points three-phase current on this section backbone, and the downstream end points three-phase current on this section branch line is got over the upper limit.
Conclusion: this section is failed because not, and on the branch line that this section is drawn three phase short circuit fault takes place.
D) four end section patterns
Rule one:
Pacing items: this section upper reaches end points two phases (being made as A, B phase) electric current is got over the upper limit, and third phase (being made as the C phase) electric current is got over the upper limit, and the three-phase current of three downstream end points is all got over the upper limit;
A, the B voltage between phases of one: four end points of verification condition approach 0, and all the other voltages between phases are normal;
Verification condition two: upper reaches terminal A, the B phase current of upper reaches adjacent sections are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items: this section upper reaches end points three-phase current is got over the upper limit, and the three-phase current of three downstream end points is not all got over the upper limit;
The three-phase voltage between phases of one: four end points of verification condition approaches 0;
Verification condition two: the upper reaches end points three-phase current of upper reaches adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
Rule three:
Pacing items: this section upper reaches end points two phases (being made as A, B phase) electric current is got over the upper limit; Third phase (being made as the C phase) electric current is not got over the upper limit; And the downstream end points three-phase current that reaches on this section backbone on the branch line (being designated as branch line 1) is all got over the upper limit; And downstream terminal A, B phase current on another branch line of this section (being designated as branch line 2) are got over the upper limit, and the C phase current is not out-of-limit.
Conclusion: this section is failed because not, and on the branch line 2 that this section is drawn A, B two-phase short-circuit fault takes place.
Rule four:
Pacing items: this section upper reaches end points three-phase current is got over the upper limit; And the downstream end points three-phase current that reaches on this section backbone on the branch line (being designated as branch line 1) is all got over the upper limit, and the downstream end points three-phase current on another branch line of this section (being designated as branch line 2) is got over the upper limit.
Conclusion: this section is failed because not, and on the branch line 2 that this section is drawn three phase short circuit fault takes place.
2) end points level
Rule one:
Pacing items: this end points connects arbitrary section two phase or three phase short circuit fault takes place.
Conclusion: this end points is 2 phase or three phase short circuit fault points.
Rule two:
Pacing items: this end points is the upper reaches end points of two phases or three phase short circuit fault section.
Conclusion: this end points is two phase or three phase short circuit fault upper reaches end points.
Rule three:
Pacing items: this end points is the downstream end points of two phases or three phase short circuit fault section.
Conclusion: this end points is two phase or three phase short circuit fault downstream end points.
3) circuit hierarchy
Rule one:
Pacing items: arbitrary end points is 2 phase or three phase short circuit fault points on this circuit.
Conclusion: this circuit is two phase or three phase short circuit fault circuits.
As shown in Figure 2, Fig. 2 is the short trouble localization method example structure synoptic diagram that the present invention is used for typical power distribution network, the power distribution network that moves for the operation with closed ring mode shown in the figure.
Two types: for power distribution network with the closed-loop fashion operation
End points is the residing position of intelligent body in the electrical network.End points is divided into some sections with circuit, itself is in the link position of section and section.
Section is the base unit that constitutes circuit.End points number and present position according to section; Can be with the section in the power distribution network of operation with closed ring mode, be divided into the ten kinds of typical modules of four end section on four end section, four end section on three backbones, four end section on two backbones and the branch line on three end section on both-end section on single-ended section, the backbone, the both-end section on the branch line, the full backbone, three end section on half backbone, three end section on the branch line, the full backbone.N (N >=3) end section is made up of N bar branch line, the branch line in the corresponding section of each end points.Circuit is connected to form by section and section.
Operation with closed ring short circuit fault of power distribution network locating rule includes but not limited to following mode of rule:
1) section level:
A) single-ended range mode
Rule one:
Pacing items: this section end points two phases (being made as A, B phase) electric current is got over the upper limit, and third phase (being made as the C phase) electric current is not got over the upper limit;
Verification condition one: terminal A, B voltage between phases approach 0, and all the other voltages between phases are normal;
Verification condition two: upper reaches terminal A, the B phase current of upper reaches adjacent sections are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items: this section end points three-phase current is got over the upper limit;
Verification condition one: end points three-phase voltage between phases approaches 0;
Verification condition two: the upper reaches end points three-phase current of upper reaches adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
B) the both-end section on the backbone
Rule one:
Pacing items one: this section two-end-point two phases (being made as A, B phase) direction of current is and flows into this section direction;
Two: one end points (being made as end points 1) of pacing items A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And another end points (being made as end points 2) A, B phase current negative sense are got over the upper limit, and the C phase current is not got over the upper limit;
Verification condition one: two-end-point A, B voltage between phases approach 0, and all the other voltages between phases are normal.
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items one: this section two-end-point three-phase current direction is and flows into this section direction;
Two: one end points (being made as end points 1) of pacing items, three electric current forwards are got over the upper limit; And another end points (being made as end points 2) three-phase current negative sense is got over the upper limit;
Verification condition one: two-end-point three-phase voltage between phases approaches 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, the three-phase current forward is got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, the three-phase current negative sense is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
C) the both-end section on the branch line
Rule one:
Pacing items: this section upper reaches end points two phases (being made as A, B phase) electric current forward is got over the upper limit, and third phase (being made as the C phase) electric current is not got over the upper limit; And downstream end points three-phase current is not all got over the upper limit;
Verification condition one: two-end-point A, B voltage between phases approach 0, and all the other voltages between phases are normal;
Verification condition two: the upper reaches terminal A of this section upper reaches adjacent sections, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items: this section upper reaches end points three-phase current forward is got over the upper limit; And downstream end points three-phase current is not all got over the upper limit;
Verification condition one: two-end-point three-phase voltage between phases approaches 0;
Verification condition two: the upper reaches end points three-phase current forward of this section upper reaches adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
D) three end section on the full backbone
Rule one:
Pacing items one: this section three end points two phases (being made as A, B phase) direction of current is and flows into this section direction;
Two: one end points (being made as end points 1) of pacing items A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And two end points (being made as end points 2,3) A, B phase current negative sense are got over the upper limit in addition, and the C phase current is not got over the upper limit;
Verification condition one: three terminal A, B phase voltage between phases approach 0, and all the other voltages between phases are normal;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And the adjacent end points in end points 2 and end points 3 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and the C phase current is got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items one: this section three end points three-phase current directions are and flow into this section direction;
Two: one end points (being made as end points 1) of pacing items three-phase current forward is got over the upper limit; And two end points (being made as end points 2,3) three-phase current negative sense is got over the upper limit in addition;
One: three end points three-phase of verification condition voltage between phases approaches 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, the three-phase current forward is got over the upper limit; And the adjacent end points in end points 2 and end points 3 non-this section on backbone, the three-phase current negative sense is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
E) three end section on half backbone
Rule one:
Pacing items one: two end points two phases (being made as A, the B phase) direction of current on this section backbone is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And another backbone upper extreme point (being made as end points 2) A, B phase current negative sense are got over the upper limit, and the C phase current is not got over the upper limit; And branch line upper extreme point (being made as end points 3) three-phase current is not all got over the upper limit.
Verification condition one: three terminal A, B voltage between phases approach 0, and all the other voltages between phases are normal;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items one: two end points three-phase current directions on this section backbone are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And another backbone upper extreme point (being made as end points 2) three-phase current negative sense is got over the upper limit; And branch line upper extreme point (being made as end points 3) three-phase current is not all got over the upper limit;
One: three end points three-phase of verification condition voltage between phases approaches 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, the three-phase current forward is got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, the three-phase current negative sense is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
Rule three:
Pacing items one: two end points two phases (being made as A, the B phase) direction of current on this section backbone is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And another backbone upper extreme point (being made as end points 2) A, B phase current negative sense are got over the upper limit, and the C phase current is not got over the upper limit; And branch line upper extreme point (being made as end points 3) A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: this section is failed because not, and A takes place on the branch line that this section is drawn, the B two-phase short-circuit fault.
Rule four:
Pacing items one: two end points three-phase current directions on this section backbone are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And another backbone upper extreme point (being made as end points 2) three-phase current negative sense is got over the upper limit; And branch line upper extreme point (being made as end points 3) three-phase current forward is got over the upper limit.
Conclusion: this section is failed because not, and on the branch line that this section is drawn three phase short circuit fault takes place.
F) three end section on the branch line
Rule one:
Pacing items: this section upper reaches end points two phases (being made as A, B phase) electric current is got over the upper limit, and third phase (being made as the C phase) electric current is got over the upper limit, and the three-phase current of two downstream end points is all got over the upper limit;
A, the B voltage between phases of one: three end points of verification condition approach 0, and all the other voltages between phases are normal;
Verification condition two: upper reaches terminal A, the B phase current of upper reaches adjacent sections are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items: this section upper reaches end points three-phase current is got over the upper limit, and the three-phase current of two downstream end points is not all got over the upper limit;
The three-phase voltage between phases of one: three end points of verification condition approaches 0;
Verification condition two: the upper reaches end points three-phase current of upper reaches adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
G) four end section on the full backbone
Rule one:
Pacing items one: this section four end points two phases (being made as A, B phase) direction of current is and flows into this section direction;
Two: one end points (being made as end points 1) of pacing items A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And three end points (being made as end points 2,3,4) A, B phase current negative sense are got over the upper limit in addition, and the C phase current is not got over the upper limit;
Verification condition one: four terminal A, B voltage between phases approach 0, and all the other voltages between phases are normal;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And the adjacent end points in end points 2, end points 3 and end points 4 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and the C phase current is got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items one: this section four end points three-phase current directions are and flow into this section direction;
Two: one end points (being made as end points 1) of pacing items three-phase current forward is got over the upper limit; And three end points (being made as end points 2,3,4) three-phase current negative sense is got over the upper limit in addition;
One: four end points three-phase of verification condition voltage between phases approaches 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, the three-phase current forward is got over the upper limit; And the adjacent end points in end points 2, end points 3 and end points 4 non-this section on backbone, the three-phase current negative sense is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
H) four end section on three backbones
Rule one:
Pacing items one: three end points two phases (being made as A, the B phase) direction of current on this section backbone is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And two backbone upper extreme points (being made as end points 2,3) A, B phase current negative sense are got over the upper limit in addition, and the C phase current is not got over the upper limit; And branch line upper extreme point (being made as end points 4) three-phase current is not all got over the upper limit;
Verification condition one: four terminal A, B voltage between phases approach 0, and all the other voltages between phases are normal;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And the adjacent end points in end points 2,3 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items one: three end points three-phase current directions on this section backbone are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And two backbone upper extreme points (being made as end points 2,3) three-phase current negative sense is got over the upper limit in addition; And branch line upper extreme point (being made as end points 4) three-phase current is not all got over the upper limit;
One: four end points three-phase of verification condition voltage between phases all approaches 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, the three-phase current forward is got over the upper limit; And the adjacent end points in end points 2,3 non-this section on backbone, the three-phase current negative sense is got over the upper limit;
Conclusion: this section generation three phase short circuit fault.
Rule three:
Pacing items one: three end points two phases (being made as A, the B phase) direction of current on this section backbone is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And two backbone upper extreme points (being made as end points 2,3) A, B phase current negative sense are got over the upper limit in addition, and the C phase current is not got over the upper limit; And branch line upper extreme point (being made as end points 4) A, B circuitry phase forward are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: this section is failed because not, and A takes place on the branch line that this section is drawn, the B two-phase short-circuit fault.
Rule four:
Pacing items one: three end points three-phase current directions on this section backbone are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And two backbone upper extreme points (being made as end points 2,3) three-phase current negative sense is got over the upper limit in addition; And branch line upper extreme point (being made as end points 4) three-phase current forward is got over the upper limit.
Conclusion: this section is failed because not, and on the branch line that this section is drawn three phase short circuit fault takes place.
I) four end section on two backbones
Rule one:
Pacing items one: two end points two phases (being made as A, the B phase) direction of current on this section backbone is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And another backbone upper extreme point (being made as end points 2) A, B phase current negative sense are got over the upper limit, and the C phase current is not got over the upper limit; And two branch line upper extreme points (being made as end points 3,4) three-phase current is not all got over the upper limit;
Verification condition one: four terminal A, B voltage between phases approach 0, and all the other voltages between phases are normal;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items one: two end points three-phase current directions on this section backbone are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And another backbone upper extreme point (being made as end points 2) three-phase current negative sense is got over the upper limit; And two branch line upper extreme points (being made as end points 3,4) three-phase current is not all got over the upper limit;
One: four end points three-phase of verification condition voltage between phases all approaches 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, the three-phase current forward is got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, the three-phase current negative sense is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
Rule three:
Pacing items one: two end points two phases (being made as A, the B phase) direction of current on this section backbone is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit; And another backbone upper extreme point (being made as end points 2) A, B phase current negative sense are got over the upper limit, and the C phase current is not got over the upper limit; And a branch line upper extreme point (being made as end points 3) A, B circuitry phase forward are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: this section is failed because not, and on the branch line at end points 3 places that this section is drawn A, B two-phase short-circuit fault takes place.
Rule four:
Pacing items one: two end points three-phase current directions on this section backbone are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And another backbone upper extreme point (being made as end points 2) three-phase current negative sense is got over the upper limit; And a branch line upper extreme point (being made as end points 3) three-phase current forward is got over the upper limit.
Conclusion: this section is failed because not, and on the branch line at end points 3 places that this section is drawn three phase short circuit fault takes place.
J) four end section on the branch line
Rule one:
Pacing items: this section upper reaches end points two phases (being made as A, B phase) electric current forward is got over the upper limit, and third phase (being made as the C phase) electric current is got over the upper limit, and the three-phase current of three downstream end points is all got over the upper limit;
A, the B voltage between phases of one: four end points of verification condition approach 0, and all the other voltages between phases are normal;
Verification condition two: the upper reaches terminal A of upper reaches adjacent sections, B phase current forward are got over the upper limit, and the C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault take place in this section.
Rule two:
Pacing items: this section upper reaches end points three-phase current forward is got over the upper limit, and the three-phase current of three downstream end points is not all got over the upper limit;
The three-phase voltage between phases of one: four end points of verification condition approaches 0;
Verification condition two: the upper reaches end points three-phase current forward of upper reaches adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
2) end points level:
Rule one:
Pacing items: this end points connects arbitrary section two phase or three phase short circuit fault takes place.
Conclusion: this end points is 2 phase or three phase short circuit fault points.
Rule two:
Pacing items: this end points is the upper reaches end points of two phases or three phase short circuit fault section.
Conclusion: this end points is two phase or three phase short circuit fault upper reaches end points.
Rule three:
Pacing items: this end points is the downstream end points of two phases or three phase short circuit fault section.
Conclusion: this end points is two phase or three phase short circuit fault downstream end points.
3) circuit hierarchy:
Rule one:
Pacing items: arbitrary end points is 2 phase or three phase short circuit fault points on this circuit.
Conclusion: this circuit is two phase or three phase short circuit fault circuits.
Described power distribution network positive dirction in the power distribution network of open loop operation, promptly refers to the direction of tide that power supply provides.In the power distribution network of operation with closed ring, promptly refer to the direction of tide that the power supply of a certain appointment provides.
Described backbone in the power distribution network of open loop operation, is meant the circuit of bearing main trend allocating task; In the power distribution network of operation with closed ring, be meant circuit with both end power supplying power supply.
Described branch line in the power distribution network of open loop operation, is meant the trend of reception from backbone, and trend is supplied with the circuit of each load; In the power distribution network of operation with closed ring, be meant the circuit that only has single-ended trend to infeed.
The described end points electric current forward upper limit is meant when electrical network normally moves, and flows through the forward current maximum amplitude of this end points.
The described end points electric current negative sense upper limit is meant when electrical network normally moves, and flows through the negative current maximum amplitude of this end points.
Described section upper reaches end points is meant that the forward trend flows into the end points of this section institute warp.
Described section downstream end points is meant that the forward trend flows out the end points of this section institute warp.
Described two adjacent being meant of section, these two sections link to each other through a common end points.
The upstream zone of described certain section is meant, the forward trend flow into before this section the section of process.
Described single-ended section is meant that the section of an end points is only arranged.It is terminal that such section has more present electrical network.
Described both-end section is meant the section of two end points.
Described three end section are meant the section of three end points.
Three end section on the described full backbone are meant that three branch lines on this three end section are all on the electrical network backbone.
Three end section on described half backbone are meant that this three end section has two branch lines on the electrical network backbone, and a branch line is on the electrical network branch line.
Described four end section are meant the section of four end points.
Four end section on the described full backbone are meant that four branch lines on this four end section are all on the electrical network backbone.
Four end section on described three backbones are meant that this four end section has three branch lines on the electrical network backbone, and a branch line is on the electrical network branch line.
Four end section on described two backbones are meant that this four end section has two branch lines on the electrical network backbone, and two branch lines are on the electrical network branch line.
(3) in the power distribution network operational process, each intelligent body is monitored this vagabond current and voltage operation of power networks information in real time, if this vagabond current is out-of-limit, then gets into step (4); Otherwise, continue circulation and carry out this step;
(4) each intelligent body sends the out-of-limit signal of electric current to direct neighbor intelligence body and higher level's intelligence body;
Described two intelligent body direct neighbors are meant that two intelligent body place end points link to each other through lead, and other intelligent body of nothing is separated by between the two intelligent bodies.
(5) check whether this locality has the short trouble early warning signal,, then confirm local failed because if having; If no, then carry out step (6).
(6) wait for the out-of-limit signal of electric current that receives the transmission of direct neighbor intelligence body, delay time t gets into step (7);
(7) utilize local short trouble locating rule storehouse,,, carry out the calibration of rule match and multiple condition, diagnostic reasoning according to the out-of-limit signal of electric current local and that receive in conjunction with power distribution network wiring type and should intelligence body present position;
Reasoning process is followed following requirement:
1. for only there being pacing items not have the rule of calibration condition,, can confirm the conclusion establishment as long as actual conditions satisfy all pacing itemss.
The rule that 2. calibration condition is arranged again for existing pacing items, if actual conditions satisfy all pacing itemss and satisfy at least one calibration condition, then conclusion is set up.
3. for each rule,, can confirm that conclusion is false if actual conditions do not satisfy pacing items.
The rule that 4. calibration condition is arranged again for existing pacing items, if actual conditions satisfy whole pacing itemss, and all calibration conditions all do not satisfy, then conclusion possibly set up.
(8) confirm diagnostic result.
Diagnostic result includes but not limited to following content:
Whether each section that a, this intelligence body are connected two phase or three phase short circuit fault take place.
Whether each section that b, this intelligence body are connected two phase or three phase short circuit fault possibly take place.
Whether c, this intelligence body are 2 phase or three phase short circuit fault points (fault upper reaches end points or downstream end points).
Whether subordinate's electrical network of d, this intelligence body place section two phase or three phase short circuit fault take place.
Whether e, this intelligence body feeder line of living in are two phase or three phase short circuit fault feeder lines.
The short circuit fault of power distribution network localization method of a kind of multiple calibration based on distributed intelligence provided by the invention utilizes fault pre-alarming information, realizes confirming fast of fault; Based on the distributed intelligence body, local information is local to be handled, and diagnosis speed is fast; Utilize the Rulemaking method of medelling, it is reliable comprehensively to handle problems; Realized the localization of fault of section level, dwindled the power failure scope, diagnosed more accurate; Adopt the Rulemaking mode of multiple calibration, avoided the switch malfunction.Simultaneously, except that the diagnosis of this locality, can carry out the accident of subordinate's electrical network and judge, be easy to realize multi-stage protection, be desirable short trouble localization method.
Should be noted that at last: above embodiment is only in order to explanation the application's technical scheme but not to the restriction of its protection domain; Although the application has been carried out detailed explanation with reference to the foregoing description; The those of ordinary skill in affiliated field is to be understood that: those skilled in the art still can carry out all changes, revise or be equal to replacement to the embodiment of application after reading the application; These changes, modification perhaps are equal to replacement, and it is all within the claim scope that its application is awaited the reply.
Claims (9)
1. the short circuit fault of power distribution network localization method based on the multiple calibration of distributed intelligence is characterized in that, said method is utilized early warning information or increased the verification condition and carries out localization of fault; Said method comprises the steps:
(1) intelligent body is set in said power distribution network;
(2) set up the multi-level many verifications short trouble of medelling locating rule storehouse;
(3) said intelligent body is monitored this vagabond current in the said power distribution network operational process and voltage power distribution network operation information in real time, if this vagabond current is out-of-limit, then gets into step (4); Otherwise, continue circulation and carry out this step;
(4) said intelligent body sends the out-of-limit signal of electric current to direct neighbor intelligence body and higher level's intelligence body;
(5) check whether this locality has the short trouble early warning signal,, then confirm local failed because if having; If no, then carry out step (6);
(6) wait for the out-of-limit signal of electric current that receives the transmission of said direct neighbor intelligence body, get into step (7) behind the delay time t;
(7) carry out the calibration of rule match and multiple condition, diagnostic reasoning; Said rule condition coupling comprises: utilize said short trouble locating rule storehouse, in conjunction with said power distribution network wiring type and said intelligent body present position with according to the out-of-limit signal of electric current local and that receive;
(8) confirm diagnostic result.
2. short circuit fault of power distribution network localization method as claimed in claim 1 is characterized in that, described in the said step (1) in the power distribution network position that is provided with of intelligent body comprise:
Locate at a certain distance on A, the circuit, the liaison office of different circuit;
B, circuit branch;
C, distribution substation/distribute-electricity transformer district;
D, ring main unit/switching station/cable distribution box;
E, distributed power source and site;
F, user access point;
The function that said intelligent body possesses comprises that program run, data storage, electric parameters detect and information communication.
3. short circuit fault of power distribution network localization method as claimed in claim 1; It is characterized in that; Set up the multi-level many verifications short trouble of medelling locating rule storehouse described in the said step (2) and comprise the method for operation, set up said short trouble locating rule storehouse to power distribution network;
The said power distribution network method of operation comprises the open loop method of operation and operation with closed ring mode; The said open loop method of operation is the radial power system operating mode of single supply; Said operation with closed ring mode is the method for operation that the N power supply is supplied power to a power distribution network simultaneously;
In the power distribution network with the said open loop method of operation, end points is the residing position of intelligent body in the said power distribution network; Said end points is divided into section with circuit; Said end points is in the link position of section and section; Said section is the base unit that constitutes circuit; According to the end points number of said section, be divided into single-ended section, both-end section, three end section and four end section with the section in the open loop method of operation power distribution network with said.
4. short circuit fault of power distribution network localization method as claimed in claim 3 is characterized in that, the said mode of rule that comprises section level, end points level and circuit hierarchy with the short circuit fault of power distribution network locating rule pattern of the open loop method of operation; The mode of rule of said section level comprises single-ended range mode, both-end range mode, three end section patterns and four end section patterns; Wherein, the rule condition of section level comprises pacing items and verification condition; The rule condition of end points level and circuit hierarchy comprises pacing items.
5. short circuit fault of power distribution network localization method as claimed in claim 3 is characterized in that, in the power distribution network with the operation with closed ring mode, end points is the residing position of intelligent body in the said power distribution network; Said end points is divided into section with circuit; Said end points is in the link position of section and section; Said section is the base unit that constitutes circuit; According to the end points number and the present position of said section, be divided into both-end section on single-ended section, the backbone, the both-end section on the branch line, three end section on the full backbone, three end section on half backbone, three end section on the branch line, four end section on the full backbone, four end section on three backbones, four end section and four end section on the branch line on two backbones with the section in the power distribution network of operation with closed ring mode with said.
6. short circuit fault of power distribution network localization method as claimed in claim 5 is characterized in that, the said mode of rule that comprises section level, end points level and circuit hierarchy with the short circuit fault of power distribution network locating rule pattern of operation with closed ring mode; The mode of rule of said section level comprises four end section patterns, four end section patterns on three backbones, four end section patterns on two backbones and the four end section patterns on the branch line on three end section patterns on both-end range mode on single-ended range mode, the backbone, the both-end range mode on the branch line, the full backbone, three end section patterns on half backbone, three end section patterns on the branch line, the full backbone; Wherein, the rule condition of section level comprises pacing items and verification condition or comprises pacing items; The rule condition of end points level and circuit hierarchy comprises pacing items.
7. short circuit fault of power distribution network localization method as claimed in claim 1 is characterized in that, in the said step (4), the intelligent body of said direct neighbor is meant that two intelligence place end points link to each other through lead, and other intelligent body of nothing is separated by between the two intelligent bodies.
8. short circuit fault of power distribution network localization method as claimed in claim 1 is characterized in that, in the said step (7), said diagnostic reasoning is followed following requirement:
1. the rule of not having calibration condition for only pacing items being arranged as long as actual conditions satisfy all pacing itemss, can be confirmed the conclusion establishment;
The rule that 2. calibration condition is arranged again for existing pacing items, if actual conditions satisfy all pacing itemss and satisfy at least one calibration condition, then conclusion is set up;
3. for described rule,, can confirm that conclusion is false if actual conditions do not satisfy pacing items;
The rule that 4. calibration condition is arranged again for existing pacing items, if actual conditions satisfy whole pacing itemss, and all calibration conditions all do not satisfy, then conclusion possibly set up.
9. short circuit fault of power distribution network localization method as claimed in claim 1 is characterized in that, in the said step (8), said diagnostic result comprises:
Whether each section that a, said intelligent body connected two phase or three phase short circuit fault take place;
Whether each section that b, said intelligent body connected two phase or three phase short circuit fault possibly take place;
Whether c, said intelligent body are 2 phase or three phase short circuit fault points;
D, said two phases or three phase short circuit fault point are positioned at the upper reaches or the downstream end points place of fault section;
Whether subordinate's electrical network of e, said intelligent body place section two phase or three phase short circuit fault take place;
Whether f, said intelligent body feeder line of living in are two phase or three phase short circuit fault feeder lines.
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| CN103354352A (en) * | 2013-04-23 | 2013-10-16 | 国家电网公司 | Distributed intelligence based power distribution network safety protection method |
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