CN105356427A - Longitudinal zero sequence direction protection method of one-tower double-circuit parallel transmission line - Google Patents
Longitudinal zero sequence direction protection method of one-tower double-circuit parallel transmission line Download PDFInfo
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- CN105356427A CN105356427A CN201510756660.7A CN201510756660A CN105356427A CN 105356427 A CN105356427 A CN 105356427A CN 201510756660 A CN201510756660 A CN 201510756660A CN 105356427 A CN105356427 A CN 105356427A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
The present invention relates to the technical field of relay protection and particularly relates to a longitudinal zero sequence direction protection method of a one-tower double-circuit parallel transmission line. The method comprises a step of collecting the electrical quantity of two ends of a transmission line when the transmission line has a fault, a step of judging whether one end of the transmission line has negative sequence current or not, a step of judging whether the zero sequence direction of one end of the transmission line is positive or not if the one end of the transmission line has the negative sequence current, a step of judging whether the zero sequence directions of two ends of the transmission line is positive or not if the zero sequence direction of one end of the transmission line is positive, a step of judging that the fault is an internal region fault, and acting longitudinal zero sequence protection, otherwise, judging that the fault is an external region fault, and not acting longitudinal zero sequence protection. Through employing different zero sequence direction judgment methods for the different fault types in the transmission line, the accuracy of the longitudinal zero sequence direction protection is improved, the problem that the longitudinal zero sequence direction protection of the other non-failed line acts wrongly if one transmission line is failed in the one-tower double-circuit parallel transmission line is solved, and the reliability and the security of the transmission line are improved.
Description
Technical field
The present invention relates to technical field of relay protection, be specifically related to a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel.
Background technology
For China's supergrid, main configuration pilot protection is as the main protection of transmission line, and pilot protection comprises longitudinal differential protection, longitudinal distance protection, pilot zero sequence direction relay.Along with being constructed and put into operation of China's Three Gorges hydraulic and electric engineering engineering, the electrical network general layout of transferring electricity from the west to the east, north and south confession mutually is progressively formed, and in the construction of China's extra high voltage network, common-tower double-return transmission lines in parallel is widely used.Due to a variety of causes; the pilot zero sequence direction relay misoperation of same tower double back transmission line non-faulting side; the accident occurred is caused to get more and more; therefore; the mechanism of analysis circuit pilot zero sequence direction relay malfunction, research avoids the method for the pilot zero sequence direction relay malfunction of non-fault line to have great importance.The method that prior art adopts is: (1) existing method is thought; causing parallel double back transmission line, the reason of the pilot zero sequence direction relay malfunction of non-faulting side, is due in the strong magnetic situation of light current; when earth fault occurs in side, the impact of mutual inductance effect causes.Existing pilot zero sequence direction relay method, mainly avoids the false protection of non-faulting side for these reasons.(2) current research finds; parallel double back transmission line; there is disconnection fault in side; on non-fault line; the residual voltage zero crossing occurred; also be the key factor of the pilot zero sequence direction relay malfunction causing non-fault line, existing method fails to consider above-mentioned reason, thus causes the pilot zero sequence direction relay malfunction of common-tower double-return transmission lines in parallel non-faulting side.
Summary of the invention
The object of the invention is to a kind of pilot zero sequence direction relay method proposing common-tower double-return transmission lines in parallel; by adopting different zero sequence direction determination methods to fault types different on transmission line; improve the accuracy of zero-sequence pilot relay protection; solve in common-tower double-return transmission lines in parallel; article one, transmission line breaks down; the problem of the zero-sequence pilot relay protection malfunction on another non-fault line, improves reliability and the fail safe of transmission line.
For reaching this object, the present invention by the following technical solutions:
As one aspect of the present invention, the pilot zero sequence direction relay method of a kind of common-tower double-return transmission lines in parallel provided, comprising:
Transmission line breaks down, gathers the electric parameters at the two ends of described transmission line;
Judge whether one end of transmission line has negative-sequence current;
Whether the zero sequence direction if so, then judging described one end of transmission line is forward;
If so, judge whether the zero sequence direction at the two ends of described transmission line is all forward;
If so, then judge that described fault is as troubles inside the sample space, pilot zero sequence direction relay action;
Otherwise judge that described fault is as external area error, pilot zero sequence direction relay is failure to actuate.
Preferably, whether the described zero sequence direction judging described one end of transmission line is that forward comprises:
Judge whether the electric parameters of the described one end of the transmission line collected meets the main criterion formula of zero sequence direction, and the main criterion formula of described zero sequence direction is:
and
, wherein, U
0for: the residual voltage of described one end of transmission line, I
0for: the zero-sequence current of described one end of transmission line, Z
0Lfor: the zero sequence impedance of transmission line, alphabetical A is the unit ampere of electric current;
Judge whether the electric parameters of the described one end of the transmission line collected meets negative phase-sequence assistant criteria formula, and described negative phase-sequence assistant criteria formula is:
and
, wherein, U
2for: the negative sequence voltage of described one end of transmission line, I
2for: the negative-sequence current of described one end of transmission line, Z
2Lfor the negative sequence impedance of transmission line, Uset is: the negative sequence voltage of the protective device of described one end of transmission line is adjusted definite value;
If described in the electric parameters that collects meet the main criterion formula of zero sequence direction and negative phase-sequence assistant criteria formula simultaneously, then judge that the zero sequence direction of described one end of described transmission line is as forward.
Preferably, describedly judge whether the zero sequence direction at the two ends of described transmission line is all forward and comprises:
Whether the zero sequence direction judging the other end of described transmission line according to described zero sequence direction main criterion formula and negative phase-sequence assistant criteria formula is forward.
Preferably, describedly judge whether one end of transmission line has negative-sequence current to be specially:
According to formula
judge whether one end of transmission line has negative-sequence current, wherein, I
setnegative-sequence current for the protective device of described one end of transmission line is adjusted definite value, if formula
set up, then judge described one end non-negative sequence current of transmission line, otherwise, judge that there is negative-sequence current described one end of transmission line.
Preferably, described judge whether one end of transmission line has negative-sequence current after, judge the zero sequence direction at the two ends of described transmission line also comprises before whether being all forward:
If described one end non-negative sequence current of transmission line, then judge whether described one end of transmission line has negative sequence voltage;
If so, then judge that the zero sequence direction of described one end of transmission line is as forward;
Otherwise, then judge that the zero sequence direction of described one end of transmission line is negative sense.
Preferably, describedly judge whether described one end of transmission line has negative sequence voltage to be specially:
According to formula
judge whether described one end of transmission line has negative sequence voltage, if formula
set up, then judge that described one end of transmission line is without negative sequence voltage, otherwise, judge that there is negative sequence voltage described one end of transmission line.
Preferably, describedly judge whether the zero sequence direction at the two ends of described transmission line is all forward and comprises:
If the described other end non-negative sequence current of transmission line, then judge whether the described other end of transmission line has negative sequence voltage;
If so, then judge that the zero sequence direction of the described other end of transmission line is as forward;
Otherwise, then judge that the zero sequence direction of the described other end of transmission line is negative sense.
Preferably, the electric parameters at the two ends of the described transmission line of described collection is specially:
The electric parameters at the two ends of described transmission line is gathered by two protective devices at transmission line two ends.
Preferably, described protective device judges the zero sequence direction of local terminal respectively according to the electric parameters collected, and the judged result of local terminal zero sequence direction is sent to the protective device of the other end by the mode of communication.
Beneficial effect of the present invention is: a kind of pilot zero sequence direction relay method of common-tower double-return transmission lines in parallel, comprising: transmission line breaks down, and gathers the electric parameters at the two ends of described transmission line; Judge whether one end of transmission line has negative-sequence current; Whether the zero sequence direction if so, then judging described one end of transmission line is forward; If so, judge whether the zero sequence direction at the two ends of described transmission line is all forward; If so, then judge that described fault is as troubles inside the sample space, pilot zero sequence direction relay action; Otherwise; judge that described fault is as external area error; pilot zero sequence direction relay is failure to actuate; by adopting different zero sequence direction determination methods to fault types different on transmission line; improve the accuracy of zero-sequence pilot relay protection, solve in common-tower double-return transmission lines in parallel, a transmission line breaks down; the problem of the zero-sequence pilot relay protection malfunction on another non-fault line, improves reliability and the fail safe of transmission line.
Accompanying drawing explanation
Fig. 1 is the pilot zero sequence direction relay method flow diagram of a kind of common-tower double-return transmission lines in parallel that the embodiment of the present invention provides;
Fig. 2 is the common-tower double-return transmission lines in parallel schematic diagram that the embodiment of the present invention provides;
Fig. 3 is non-fault line residual voltage distribution map in the common-tower double-return transmission lines in parallel disconnection fault that provides of the embodiment of the present invention.
Embodiment
Technical scheme of the present invention is further illustrated by embodiment below in conjunction with Fig. 1-Fig. 3.
Fig. 1 is the pilot zero sequence direction relay method flow diagram of a kind of common-tower double-return transmission lines in parallel that the embodiment of the present invention provides.
A pilot zero sequence direction relay method for common-tower double-return transmission lines in parallel, comprising:
S10, transmission line break down, gathers the electric parameters at the two ends of described transmission line;
S20, judge whether one end of transmission line has negative-sequence current;
Whether S30, the zero sequence direction if so, then judging described one end of transmission line are forward;
S40, if so, judge whether the zero sequence direction at the two ends of described transmission line is all forward;
S50, if so, then judge that described fault is as troubles inside the sample space, pilot zero sequence direction relay action;
S60 otherwise, judge that described fault is as external area error, pilot zero sequence direction relay is failure to actuate.
In the present embodiment; by adopting different zero sequence direction determination methods to fault types different on transmission line; improve the accuracy of zero-sequence pilot relay protection; solve in common-tower double-return transmission lines in parallel; article one, transmission line breaks down; the problem of the zero-sequence pilot relay protection malfunction on another non-fault line, improves reliability and the fail safe of transmission line.
In the present embodiment; common-tower double-return transmission lines in parallel is illustrated; as shown in Figure 2, between M side transformer station and N side transformer station, carry out transmission of electricity by transmission line 1 and transmission line 2 and transmit; A point installs M side line line protection device; protection transmission line 1, B point installs N side line line protection device, same protection transmission line 1; A point, to the power transmission line scope of B point, is the protection range of protective device.Because transmission line 1 and transmission line 2 are arranged on above same seat steel tower usually, and transmission line 1 and transmission line 2 belong to two different loops, so the transmission line illustrated by Fig. 1, are called common-tower double-return transmission lines in parallel.
Method of the present invention is a kind of circuit longitudinal zero-sequence voltage injection, defines basic concepts, be described as follows in power industry:
(1) vertical and horizontal: be seen as longitudinal direction toward the other end from transmission line one end, longitudinal orthogonal direction is laterally.Vertical connection, refers to that the two ends of transmission line contact.The protection that the vertical connection information (such as: command information, analog information) of dependence is formed is called pilot protection.
(2) zero sequence and negative phase-sequence, refers to zero sequence and the negative sequence component of electric parameters respectively, causes producing by there is unbalanced fault in transmission line.
(3) the zero sequence electric parameters in transmission line comprises residual voltage and zero-sequence current.
(4) the negative phase-sequence electric parameters in transmission line comprises negative sequence voltage and negative-sequence current.
(5) the direction regulation of zero-sequence current, it is forward that bus flows to circuit, and line flows is negative sense to bus.
(6) the direction regulation of negative-sequence current, it is forward that bus flows to circuit, and line flows is negative sense to bus.
(7) the direction regulation of residual voltage, the voltage of circuit is forward higher than the earth, is negative sense lower than the earth.
(8) the direction regulation of negative sequence voltage, the voltage of circuit is forward higher than the earth, is negative sense lower than the earth.
(9) troubles inside the sample space and external area error, occurs in the fault in protective device protection range, is called troubles inside the sample space, the fault that such as, in Fig. 2 C point occurs; Occur in the fault beyond protective device protection range, be referred to as external area error, the fault that such as, in Fig. 2 D point and E point occur.
In the present embodiment, for the breakdown judge of transmission line, if the transmission line two ends zero sequence direction judged, two ends are forward, are indicated as troubles inside the sample space, protection act; If the zero sequence direction at the transmission line two ends judged, is all negative sense, or one end forward, one end negative sense, is indicated as external area error, and protection is failure to actuate.
In the present embodiment, described step S30 comprises:
Judge whether the electric parameters of the described one end of the transmission line collected meets the main criterion formula of zero sequence direction, and the main criterion formula of described zero sequence direction is:
and
, wherein, U
0for: the residual voltage of described one end of transmission line, I
0for: the zero-sequence current of described one end of transmission line, Z
0Lfor: the zero sequence impedance of transmission line, alphabetical A is the unit ampere of electric current;
Wherein, the main criterion formula of zero sequence direction comprises two formula, and these two formula are relations of logical AND;
Judge whether the electric parameters of the described one end of the transmission line collected meets negative phase-sequence assistant criteria formula, and described negative phase-sequence assistant criteria formula is:
and
, wherein, U
2for: the negative sequence voltage of described one end of transmission line, I
2for: the negative-sequence current of described one end of transmission line, Z
2Lfor the negative sequence impedance of transmission line, Uset is: the negative sequence voltage of the protective device of described one end of transmission line is adjusted definite value;
Wherein, the main criterion formula of zero sequence direction comprises two formula, and these two formula are relations of logical AND;
If described in the electric parameters that collects meet the main criterion formula of zero sequence direction and negative phase-sequence assistant criteria formula simultaneously, then judge that the zero sequence direction of described one end of described transmission line is as forward.
In the present embodiment, U
2, I
2, U
0, I
0and Z
0Lbe all the electric parameters that protective device collects, Uset is: the negative sequence voltage of the protective device of described one end of transmission line is adjusted definite value, is obtained by transmission line operations staff setting of adjusting on the protection device.
In the present embodiment, provide a kind of vertical zero sequence direction method of discrimination unlike the prior art, comprise the main criterion of zero sequence direction and negative sequence direction assistant criteria, two kinds of criterions be combined with each other, namely under considering the strong magnetic situation of light current, during a double back transmission lines in parallel transmission line generation earth fault, mutual inductance effect is the reason of the zero-sequence pilot relay protection malfunction causing non-fault line, in addition, also contemplate a transmission line generation disconnection fault of double back transmission lines in parallel, on non-fault line, there is the situation of residual voltage zero crossing, effectively prevent the zero-sequence pilot relay protection malfunction of non-fault line.
As shown in Figure 3; for non-fault line residual voltage distribution map in common-tower double-return transmission lines in parallel disconnection fault in the present embodiment; on non-fault line there is zero crossing in residual voltage; traditional zero sequence direction method of discrimination; ignore this zero crossing; cause the both sides residual voltage overcompensation of parallel double circuit transmission line, cause pilot zero sequence direction relay misoperation.
In the present embodiment, described step S40 comprises:
Whether the zero sequence direction judging the other end of described transmission line according to described zero sequence direction main criterion formula and negative phase-sequence assistant criteria formula is forward.
In the present embodiment, described step S20 is specially:
According to formula
judge whether one end of transmission line has negative-sequence current, wherein, I
setnegative-sequence current for the protective device of described one end of transmission line is adjusted definite value, is obtained, if formula by transmission line operations staff setting of adjusting on the protection device
set up, then judge described one end non-negative sequence current of transmission line, otherwise, judge that there is negative-sequence current described one end of transmission line.
As shown in Figure 1, in the present embodiment, after described step S20, also comprise before step S40:
If described one end non-negative sequence current of S31 transmission line, then judge whether described one end of transmission line has negative sequence voltage;
If so, then judge that the zero sequence direction of described one end of transmission line is as forward, and enter step S40, judge whether the zero sequence direction of the other end of described transmission line is forward further;
Otherwise, then judge that the zero sequence direction of described one end of transmission line is negative sense.
In the present embodiment, described step S31 is specially:
According to formula
judge whether described one end of transmission line has negative sequence voltage, if formula
set up, then judge that described one end of transmission line is without negative sequence voltage, otherwise, judge that there is negative sequence voltage described one end of transmission line.
In the present embodiment, described step S40 comprises:
If the described other end non-negative sequence current of transmission line, then judge whether the described other end of transmission line has negative sequence voltage;
If so, then judge that the zero sequence direction of the described other end of transmission line is as forward;
Otherwise, then judge that the zero sequence direction of the described other end of transmission line is negative sense.
In the present embodiment, the zero sequence direction at transmission line two ends is judged by the protective device at transmission line two ends respectively, judge that flow process all as shown in Figure 1, first negative-sequence current has been judged whether, if have, then judge the zero sequence direction of this end according to the main criterion formula of described zero sequence direction and negative phase-sequence assistant criteria formula; If do not have negative-sequence current to adopt another kind of decision method, judge whether negative sequence voltage, if do not have, then judge that the zero sequence direction of this end is as negative sense, do not need the zero sequence direction judging the other end again, directly regarding as this fault is external area error, and pilot zero sequence direction relay is failure to actuate; If there is negative sequence voltage, then judge that the zero sequence direction of this end is as forward, continue the zero sequence direction judging the other end; also be first judge whether the other end has negative-sequence current, and flow process is the same, does not hereby repeat; when the zero sequence direction at two ends is all forward, pilot zero sequence direction relay just action.
In the present embodiment, the electric parameters at the two ends of the described transmission line of described collection is specially:
The electric parameters at the two ends of described transmission line is gathered by two protective devices at transmission line two ends.
In the present embodiment; described protective device judges the zero sequence direction of local terminal respectively according to the electric parameters collected; and by the mode of communication the judged result of local terminal zero sequence direction is sent to the protective device of the other end; therefore; the protective device of every one end can know the zero sequence direction of local terminal and the other end, and judges that pilot zero sequence direction relay is the need of action accordingly.
The foregoing is only the specific embodiment of the present invention, these describe just in order to explain principle of the present invention, and can not be interpreted as limiting the scope of the invention by any way.Based on explanation herein, those skilled in the art does not need to pay performing creative labour can associate other specific implementation method of the present invention, and these modes all will fall within protection scope of the present invention.
Claims (9)
1. a pilot zero sequence direction relay method for common-tower double-return transmission lines in parallel, is characterized in that, comprising:
Transmission line breaks down, gathers the electric parameters at the two ends of described transmission line;
Judge whether one end of transmission line has negative-sequence current;
Whether the zero sequence direction if so, then judging described one end of transmission line is forward;
If so, judge whether the zero sequence direction at the two ends of described transmission line is all forward;
If so, then judge that described fault is as troubles inside the sample space, pilot zero sequence direction relay action;
Otherwise judge that described fault is as external area error, pilot zero sequence direction relay is failure to actuate.
2. the pilot zero sequence direction relay method of a kind of common-tower double-return transmission lines in parallel according to claim 1, is characterized in that, whether the described zero sequence direction judging described one end of transmission line is that forward comprises:
Judge whether the electric parameters of the described one end of the transmission line collected meets the main criterion formula of zero sequence direction, and the main criterion formula of described zero sequence direction is:
and
, wherein, U
0for: the residual voltage of described one end of transmission line, I
0for: the zero-sequence current of described one end of transmission line, Z
0Lfor: the zero sequence impedance of transmission line, alphabetical A is the unit ampere of electric current;
Judge whether the electric parameters of the described one end of the transmission line collected meets negative phase-sequence assistant criteria formula, and described negative phase-sequence assistant criteria formula is:
and
, wherein, U
2for: the negative sequence voltage of described one end of transmission line, I
2for: the negative-sequence current of described one end of transmission line, Z
2Lfor the negative sequence impedance of transmission line, Uset is: the negative sequence voltage of the protective device of described one end of transmission line is adjusted definite value;
If described in the electric parameters that collects meet the main criterion formula of zero sequence direction and negative phase-sequence assistant criteria formula simultaneously, then judge that the zero sequence direction of described one end of described transmission line is as forward.
3. the pilot zero sequence direction relay method of a kind of common-tower double-return transmission lines in parallel according to claim 2, is characterized in that, describedly judges whether the zero sequence direction at the two ends of described transmission line is all forward and comprises:
Whether the zero sequence direction judging the other end of described transmission line according to described zero sequence direction main criterion formula and negative phase-sequence assistant criteria formula is forward.
4. the pilot zero sequence direction relay method of a kind of common-tower double-return transmission lines in parallel according to claim 2, is characterized in that, describedly judges whether one end of transmission line has negative-sequence current to be specially:
According to formula
judge whether one end of transmission line has negative-sequence current, wherein, I
setnegative-sequence current for the protective device of described one end of transmission line is adjusted definite value, if formula
set up, then judge described one end non-negative sequence current of transmission line, otherwise, judge that there is negative-sequence current described one end of transmission line.
5. the pilot zero sequence direction relay method of a kind of common-tower double-return transmission lines in parallel according to claim 4; it is characterized in that; described judge whether one end of transmission line has negative-sequence current after, judge the zero sequence direction at the two ends of described transmission line also comprises before whether being all forward:
If described one end non-negative sequence current of transmission line, then judge whether described one end of transmission line has negative sequence voltage;
If so, then judge that the zero sequence direction of described one end of transmission line is as forward;
Otherwise, then judge that the zero sequence direction of described one end of transmission line is negative sense.
6. the pilot zero sequence direction relay method of a kind of common-tower double-return transmission lines in parallel according to claim 5, is characterized in that, describedly judges whether described one end of transmission line has negative sequence voltage to be specially:
According to formula
judge whether described one end of transmission line has negative sequence voltage, if formula
set up, then judge that described one end of transmission line is without negative sequence voltage, otherwise, judge that there is negative sequence voltage described one end of transmission line.
7. the pilot zero sequence direction relay method of a kind of common-tower double-return transmission lines in parallel according to claim 6, is characterized in that, describedly judges whether the zero sequence direction at the two ends of described transmission line is all forward and comprises:
If the described other end non-negative sequence current of transmission line, then judge whether the described other end of transmission line has negative sequence voltage;
If so, then judge that the zero sequence direction of the described other end of transmission line is as forward;
Otherwise, then judge that the zero sequence direction of the described other end of transmission line is negative sense.
8. the pilot zero sequence direction relay method of a kind of common-tower double-return transmission lines in parallel according to claim 1, is characterized in that, the electric parameters at the two ends of the described transmission line of described collection is specially:
The electric parameters at the two ends of described transmission line is gathered by two protective devices at transmission line two ends.
9. the pilot zero sequence direction relay method of a kind of common-tower double-return transmission lines in parallel according to claim 8; it is characterized in that; described protective device judges the zero sequence direction of local terminal respectively according to the electric parameters collected, and the judged result of local terminal zero sequence direction is sent to the protective device of the other end by the mode of communication.
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| CN106253244B (en) * | 2016-08-10 | 2018-08-07 | 三峡大学 | It is a kind of based on electric current from the current direction longitudinal protection method of structure reference quantity |
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| CN106353641B (en) * | 2016-09-13 | 2018-10-09 | 国电南瑞科技股份有限公司 | Method of discrimination based on multiple-circuit on same tower area internal and external fault |
| CN107947129A (en) * | 2016-10-12 | 2018-04-20 | 国网西藏电力有限公司 | A kind of zero-sequenceprotection method |
| CN107947129B (en) * | 2016-10-12 | 2020-01-17 | 国网西藏电力有限公司 | Zero sequence protection method |
| CN106602530A (en) * | 2016-12-30 | 2017-04-26 | 中国电力科学研究院 | Anti-misoperation method and anti-misoperation system for one-tower double-circuit zero-sequence pilot protection |
| CN106602530B (en) * | 2016-12-30 | 2021-12-03 | 中国电力科学研究院 | Misoperation prevention method and system for same-tower double-circuit zero-sequence longitudinal protection |
| CN109301799A (en) * | 2018-10-12 | 2019-02-01 | 中国电力科学研究院有限公司 | A kind of method and system preventing multiple-loop line line pilot zero sequence direction relay malfunction |
| CN111025080A (en) * | 2019-10-12 | 2020-04-17 | 中国电力科学研究院有限公司 | Method and system for determining fault line based on station domain information |
| CN111025080B (en) * | 2019-10-12 | 2022-11-15 | 中国电力科学研究院有限公司 | Method and system for determining fault line based on station domain information |
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