CN112557832A - Fault location method for branch direct power supply traction network in full parallel AT power supply mode - Google Patents
Fault location method for branch direct power supply traction network in full parallel AT power supply mode Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a fault location method for a branch direct power supply traction network in a full parallel AT power supply mode, which comprises the steps of collecting fault data of a substation, an AT station and a subarea station when the traction network is in fault; judging whether the fault data meet a T-R fault condition; judging whether the current ratio meets the fault occurrence condition of the branch direct power supply traction network; calculating reactance of a substation, and calculating fault distance of the branch direct power supply traction network based on the reactance-distance corresponding relation of the branch direct power supply traction network; and calculating the fault distance of the full-parallel AT power supply traction network by adopting the fault distance measuring principle of the on-pole current ratio or the transverse link current ratio of the AT neutral point. The method does not depend on newly-added equipment, overcomes the defect of fault location of the branched direct power supply traction network in the full parallel AT power supply mode, greatly lightens the inspection workload of the fault of the branched direct power supply traction network, improves the fault finding speed and reduces the possibility of influencing driving.
Description
Technical Field
The invention relates to fault location of a branch direct power supply traction network, in particular to a fault location method of a branch direct power supply traction network in a full parallel AT power supply mode.
Background
The electrified railways in China mainly have an AT power supply mode and a direct power supply mode, the AT power supply mode has the advantages of large current carrying, strong power supply capacity, long power supply distance, small voltage loss and the like, the high-speed railways mainly adopt a full parallel AT power supply mode, namely, on the basis of parallel connection of the tail ends of compound line AT traction networks, contact networks corresponding to uplink and downlink traction networks and a positive feeder line are connected in parallel through a contact switch in a place where the AT exists, and the current taking requirement of the high-speed motor train unit is met. In the full parallel AT power supply mode, the fault location method is the comprehensive application of an AT neutral point up-current ratio method, a transverse link current ratio method, an up-down current ratio method and a reactance method: the full parallel AT power supply mode adopts the principle of current ratio of up-suction or current ratio of transverse connection; in the single-wire AT direct power supply mode, the principle of current absorption ratio is adopted when T-R, F-R short circuit fault occurs, and a reactance distance table look-up method is adopted when T-F short circuit fault occurs; the tail end parallel complex line AT power supply traction network mainly adopts the current ratio principle of an uplink feeder line and a downlink feeder line of a substation; under the single-wire direct power supply mode, a reactance distance table look-up method is adopted based on the measured reactance of the substation.
In some special power supply sections, such as tie lines between main lines, substation points, station yards, electric locomotive reserve lines and the like, in order to save construction cost or facilitate maintenance, a branch direct power supply line is connected out through a T-shaped connection on an adjacent main line power supply section to obtain electric energy, and a branch line is not provided with a circuit breaker and a protection device. For the full parallel AT power supply mode interval direct power supply traction network with branches, the fault distance measurement comprehensive method cannot meet the requirement of distance measurement, and the main reason is that a distance measurement device cannot judge whether a fault is on a positive line or a branch line. Therefore, when the traction network section with the branch line breaks down, the whole branch direct power supply traction network needs to be manually searched, so that the fault removal time is greatly delayed, and the traveling is seriously influenced.
In the existing literature, for a branch contact network line of a junction station contact network and a substation network access network in a direct power supply mode, a current acquisition device is mounted on a catenary of a branch line, and when a fault occurs on the branch line, the fault current of the catenary of the branch line is acquired, so that the fault occurrence on the branch line is judged. Because the current acquisition sensor needs to be added on the catenary cable and the fault data transmission equipment needs to be installed on the strut of the catenary cable, the equipment and maintenance cost is increased, and the driving safety is even affected.
Currently, the positioning of traction network faults on branch lines is divided into two categories: 1) the current measuring equipment is added at the branch point, so that the method causes great change to the line, increases the equipment and maintenance cost and influences the safe operation of the train. 2) And no measuring equipment is provided, when a fault occurs, the time and labor are wasted only by manually inspecting the whole branch line, the fault finding time is prolonged, and the driving safety is seriously influenced.
Disclosure of Invention
Aiming AT the defects in the prior art, the invention provides a method for fault location of a branch direct power supply traction network in a full parallel AT power supply mode.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
a method for fault location of a branch direct power supply traction network in a full parallel AT power supply mode comprises the following steps:
s1, acquiring fault data of the substation, the AT station and the subarea station when the traction network is in fault;
s2, carrying out T-F and T-R fault judgment according to the fault data collected in the step S1; if the T-R fault is detected, executing the step S3; otherwise, executing step S5;
s3, calculating a current ratio according to the fault data collected in the step S1, and judging whether the calculation result meets the fault occurrence condition of the branch direct power supply traction network; if yes, go to step S4; otherwise, executing step S5;
s4, calculating reactance of the substation according to the fault data acquired in the step S1, and calculating the fault distance of the branch direct power supply traction network based on the reactance-distance corresponding relation of the branch direct power supply traction network;
and S5, calculating the fault distance of the full parallel AT power supply traction network by adopting the fault distance measuring principle of the AT neutral point absorption current ratio or the transverse connection current ratio.
Further, the step S1 specifically includes:
collecting T line voltage, F line voltage, downlink T line current, downlink F line current, uplink T line current and uplink F line current at the feeder side of a substation when a traction network fails;
collecting downlink T line current, downlink F line current, uplink T line current, uplink F line current and AT neutral point absorption current of an AT when a traction network fails;
and collecting downlink T line current, downlink F line current, uplink T line current, uplink F line current and AT neutral point absorption current of the subareas when the traction network fails.
Further, the step S2 specifically includes the following sub-steps:
s21, calculating the current absorbed by the substation according to the fault data of the substation collected in the step S1;
s22, judging whether one of the effective values of the current absorbed by the substation, the AT station and the subarea station is larger than the current setting value of the T-F fault judgment; if yes, judging that the fault is not a T-F fault, and executing step S23; otherwise, executing step S5;
s23, judging whether the maximum value of the effective value of the 4-path feeder line current where the maximum effective value of the current is absorbed is T line current or not; if yes, the fault is judged to be a T-R fault, and step S3 is executed; otherwise, step S5 is executed.
Further, the calculation method of the current drawn by the substation in step S21 is as follows:
the calculation method of the current drawn by the substation in the step S21 is as follows:
wherein the content of the first and second substances,
in order to draw up the current of the transformer substation,
、
、
、
the current is downlink T line current, downlink F line current, uplink T line current and uplink F line current of a feeder line of the substation.
Further, the step S3 specifically includes the following sub-steps:
s31, determining a fault section according to the maximum current or the transverse connection line current of the substation, the AT station and the subarea station and the secondary maximum current or the transverse connection line current in the adjacent stations of the maximum current or the transverse connection line current, and executing the step S32 if the fault section comprises a branch direct power supply traction network access point; otherwise, executing step S5;
s32, calculating a current ratio according to the current absorbed or the transverse connection current at the two ends of the fault section determined in the step S31;
s33, judging whether the absolute value of the difference value between the current ratio and the current ratio setting value is smaller than a preset judgment threshold value; if yes, judging that the fault occurs on the branched direct power supply traction network, and executing step S4; otherwise, step S5 is executed.
Further, the step S4 specifically includes the following sub-steps:
s41, calculating the reactance of the substation according to the T line voltage, the downlink T line current and the downlink F line current on the feeder side of the substation;
and S42, determining two corresponding distance points according to a pre-established reactance-distance relation table where the reactance of the substation is located, and calculating the fault distance of the branch direct power supply traction network.
Further, the reactance of the substation in step S41 is calculated by:
wherein the content of the first and second substances,Xis the reactance of a power substation,
is the T-line voltage on the feeder side of the substation,
is the down-line T-line current of the substation,
and in the downlink F line current of the power substation, Im represents an imaginary part function.
Further, the calculation method of the fault distance in step S42 is as follows:
wherein the content of the first and second substances,Lin order to be the distance of the fault,
、
respectively reactance of substation
、
The two corresponding distance points are arranged in the distance measuring way,
、
two reactance values respectively corresponding to the reactance-distance relation table, an
。
The invention has the beneficial effects that:
based on each fault electric quantity data collected by a full parallel AT traction network distance measurement system taking a power supply arm as a unit, the fault is automatically identified on a positive line of an AT power supply traction network or a branch line connected with a T through comprehensive analysis, and when the fault is judged to be on the branch line, the distance measurement is realized through a reactance-distance table look-up method, so that the defect of fault distance measurement of the branch direct power supply traction network under a full parallel AT power supply mode is overcome, the inspection workload of the fault of the branch direct power supply traction network is greatly reduced, the fault finding speed is improved, and the possibility of influencing driving is reduced;
compared with a fault location method for adding hardware (a line branch current induction sensor, communication forwarding equipment and a receiving module of a substation distance measurement device) to a branch direct power supply traction network, the method can be realized based on the existing distance measurement device, saves the reconstruction cost, does not need to add additional equipment, and better ensures the safety of the contact network.
Drawings
FIG. 1 is a schematic flow chart of a method for fault location of a branch direct power supply traction network in a full parallel AT power supply mode according to the present invention;
FIG. 2 is a schematic diagram of a traction network structure of a fully parallel AT power supply mode according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a direct power supply traction network with branches in a full parallel AT power supply mode in the embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, an embodiment of the present invention provides a method for fault location of a branch direct power supply traction network in a full parallel AT power supply mode, including the following steps:
s1, acquiring fault data of the substation, the AT station and the subarea station when the traction network is in fault;
in this embodiment, the traction network structure of the fully parallel AT power supply mode is, as shown in fig. 2, also capable of being divided into two independent single-line AT power supply operation modes or an operation mode in which the ends of the partitions in which the ATs are disconnected are connected in parallel, if necessary. Common fault types of the fully-parallel AT power supply traction network include T-R, F-R, T-F short-circuit faults, and uplink faults and downlink faults exist in the fault direction.
In FIG. 2, AT1 and AT2 are autotransformers of the AT station and the subarea station respectively,
、
t, R, F are respectively an overhead line system, a steel rail and a positive feeder line, T1, R1 and F1 are respectively a downlink overhead line system, a downlink steel rail and a downlink positive feeder line, T2, R2 and F2 are respectively an uplink overhead line system, an uplink steel rail and an uplink positive feeder line,
、
、
、
the down-line T-line current, the down-line F-line current, the up-line T-line current and the up-line F-line current of the transformer substation,
the down line T line current, the down line F line current, the up line T line current, the up line F line current, the AT neutral point attracting up current of AT,
the down line T line current, the down line F line current, the up line T line current, the up line F line current and the AT neutral point of the subarea station respectively draw up current, the CB1, the CB3 and the CB5 are down side feeder line breakers of the transformer substation, the AT station and the subarea station respectively, and the CB2, the CB4 and the CB6 are respectivelyThe breaker is an uplink feeder breaker of a substation, an AT station and a subarea station.
According to the actual design requirement of the traction network, a branch is directly connected from a contact network T of the full parallel AT traction network to directly supply power to the traction network, as shown in FIG. 3, a point k between a substation and the AT station is a branch point, wherein T3 represents the contact network, and R3 represents a steel rail.
When a T-R fault occurs from the branch point k to any point AT the tail end of the branched direct power supply traction network, the fault current necessarily flows through the branch point k, which is equivalent to the T-R short-circuit fault occurring AT the branch point k in the section of the substation-AT, so that the fault on the branched direct power supply traction network can be regarded as the T-R fault which takes current AT the point k.
The invention firstly collects the fault data of the substation, the AT station and the subarea station when the traction network is in fault in the full parallel AT power supply mode, and concretely comprises the following steps:
when the traction network fails, the distance measuring device of the substation is used for collecting the T line voltage at the feeder side of the substation
Line voltage F
Down line T line current
Down line F current
Uplink T-line current
Uplink F-line current
；
When the traction network is in fault, the distance measuring device of the AT is used for collecting the downlink T line current of the AT
Down line F current
Uplink T-line current
Uplink F-line current
AT neutral point draws up current
；
When the traction network fails, the downstream T-line current of the subareas is collected by using the distance measuring devices of the subareas
Down line F current
Uplink T-line current
Uplink F-line current
AT neutral point draws up current
。
S2, carrying out T-F and T-R fault judgment according to the fault data collected in the step S1; if the T-R fault is detected, executing the step S3; otherwise, executing step S5;
in this embodiment, the distance measuring device of the substation after the traction network fault receives fault data of the remote AT substation and the subarea substation, and performs fault judgment by combining the fault data of the substation.
Step S2 specifically includes the following substeps:
s21, calculating the current absorbed by the substation according to the fault data of the substation acquired in the step S1, wherein the calculation mode is as follows:
wherein the content of the first and second substances,
in order to draw up the current of the transformer substation,
、
、
、
the current is the downlink T line current, the downlink F line current, the uplink T line current and the uplink F line current of the transformer substation respectively.
S22, judging the current drawn by the substation, the AT station and the subarea station
、
、
Whether one of the effective values of (a) is greater than the current setting value of the T-F fault judgment
If yes, judging that the fault is not a T-F fault, and executing step S23; otherwise, judging the fault to be a T-F fault, and executing the step S5; wherein T-F fault current setting value
According to field experience dataSetting, generally taking 1200A; m is the number, and the numbers of the substation, AT station and subarea are 0, 1 and 2 respectively.
S23, judging the 4-path feeder line current where the maximum effective value of the current is absorbed
、
、
、
Whether the maximum value of the effective values of (A) is a T line current
Or
(ii) a If yes, the fault is judged to be a T-R fault, and step S3 is executed; otherwise, the fault is determined not to be a T-R fault, and step S5 is executed.
S3, calculating a current ratio according to the fault data collected in the step S1, and judging whether the calculation result meets the fault occurrence condition of the branch direct power supply traction network; if yes, go to step S4; otherwise, executing step S5;
in this embodiment, step S3 specifically includes the following sub-steps:
s31, determining the fault section as a substation-AT station section or an AT station-subarea station section according to the maximum current draw or transverse connection current of the substation, the AT station and the subarea station and the secondary maximum current draw or transverse connection current in the adjacent stations of the maximum current draw or transverse connection current, and executing the step S32 if the fault section comprises a branch direct power supply traction network access point; otherwise, executing step S5;
s32, calculating a current ratio according to the current absorbed or the transverse connection current at the two ends of the fault section determined in the step S31;
in particular toIn other words, when the cross line current ratio is adopted, the branch point of the traction network is directly supplied according to the branch, i.e. when the branch point is in the substation-AT substation section, m =1, when the branch point is in the AT substation-subarea substation section, m =2, the effective value of the cross line current of the substation is
Effective value of current in connection with AT
Effective value of line current in horizontal line of partition
(ii) a The effective value of the cross-line current at two ends of the fault section is used to calculate the cross-line current ratio
，
、
The effective values of the cross-link current at the beginning and the end of the fault section are respectively.
When the AT neutral point current-drawing ratio is adopted, the section of the branch point of the traction network is directly supplied with electricity according to the branch, namely when the branch point k is in the section of the transformer station-AT station, m =1, when the branch point k is in the section of the AT station-subarea station, m =2, the AT neutral point current-drawing effect AT the starting end of the fault section is achieved
Effective value of current drawn by AT neutral AT the end of faulty section
(ii) a So as to calculate the current-drawing ratio of the AT neutral point according to the effective values of the current-drawing values AT two ends of the fault section
。
S33, judging whether the absolute value of the difference value between the current ratio and the current ratio setting value is smaller than a preset judgment threshold value; if yes, judging that the fault occurs on the branched direct power supply traction network, and executing step S4; otherwise, step S5 is executed.
Specifically, the setting mode of the current ratio setting value in the invention is as follows:
when the branch point k has a fault, the transverse link current ratio setting value
Setting value of current ratio on suction
。
Wherein the content of the first and second substances,
、
the effective values of the cross-link current at the beginning and end of the fault section when the branch point k is faulty,
、
the effective values of the current drawn at the beginning and end of the fault section when the branch point k fails are shown.
The invention sets the judgment threshold value to be 0.01 to judge whether the current ratio and the current ratio setting value are basically equal, namely whether the current ratio meets the requirement
If yes, judging that the fault occurs on the branched direct power supply traction network, and executing step S4; otherwise, step S5 is executed.
S4, calculating reactance of the substation according to the fault data acquired in the step S1, and calculating a fault distance based on the reactance-distance corresponding relation of the branch direct power supply traction network;
in this embodiment, according to the short-circuit characteristic of the full parallel AT power supply mode, when any point on the traction network fails, the current-up ratio of the neutral point of the AT in the fault section and the current ratio of the transverse connection line obtained through comprehensive analysis of fault data of the substation, the AT station and the subarea station are constant values. And if the fault is in the running mode that the tail ends of the subareas of the AT station are connected in parallel, the uplink-downlink current ratio of the feeder line of the substation is a constant value. When a fault occurs at point k, the reactance measured by the substation is a determined value, and the reactance measured by the substation monotonically increases as the fault point gradually moves away from the branch point k in the direction of the branch line, so that the distance measurement is realized by adopting the relationship between the reactance measured by the substation and the distance of the fault point.
Step S4 specifically includes the following substeps:
s41, calculating the reactance of the substation according to the T line voltage, the downlink T line current and the downlink F line current of the feeder side of the substation, wherein the calculation mode is as follows:
wherein the content of the first and second substances,Xis the reactance of a power substation,
is the T-line voltage on the feeder side of the substation,
is the down-line T-line current of the substation,
and in the downlink F line current of the power substation, Im represents an imaginary part function.
And S42, determining two corresponding distance points according to a pre-established reactance-distance relation table where the reactance of the substation is located, and calculating the fault distance of the branch direct power supply traction network.
In particular, the invention relates toPre-establishing a reactance-distance relation table of reactance and distance point of a branched direct power supply traction network for distance measurement, wherein the number of the reactance-distance table is 8
Points, data points in tables
Distance indicating substation
When the point of (A) fails, the reactance measured by the substation is
，n=0,...,7，
、
Are one-to-one, monotonically increasing.
The invention is based on two reactance values in the reactance-distance relation table of the reactance X of the substation
、
In between, two reactance values are determined
、
Corresponding distance values are respectively
、
Therefore, the fault distance is calculated in the following way:
wherein the content of the first and second substances,Lin order to be the distance of the fault,
、
respectively reactance of substation
、
The two corresponding distance points are arranged in the distance measuring way,
、
two reactance values respectively corresponding to the reactance-distance relation table, an
。
And S5, calculating the fault distance of the full parallel AT power supply traction network by adopting the fault distance measuring principle of the AT neutral point absorption current ratio or the transverse connection current ratio.
As shown in fig. 3, when a branch point k is between a substation and an AT, and a short-circuit fault occurs AT a d point of a branch direct power supply traction network, it is determined that the fault is a T-R fault or a downlink fault according to a conventional fault location method based on the principle of fault location based on the current ratio of the AT neutral point to the current ratio of the cross-link line and the current ratio of the cross-link line of the substation, and when the current ratio of the cross-link line calculated by the fault location device according to the current ratio of the cross-link line and the current of the AT is approximately equal to the current ratio of the k point AT which the fault occurs, it is determined that the branch direct power supply. At the moment, the position of a fault point is determined by the fault reactance measured by the substation and table lookup and distance measurement based on the reactance-distance table of the branched direct power supply traction network. Both simulation and short-circuit test show that the ranging method is reasonable and accurate.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (8)
1. A method for fault location of a branch direct power supply traction network in a full parallel AT power supply mode is characterized by comprising the following steps:
s1, acquiring fault data of the substation, the AT station and the subarea station when the traction network is in fault;
s2, carrying out T-F and T-R fault judgment according to the fault data collected in the step S1; if the T-R fault is detected, executing the step S3; otherwise, executing step S5;
s3, calculating a current ratio according to the fault data collected in the step S1, and judging whether the calculation result meets the fault occurrence condition of the branch direct power supply traction network; if yes, go to step S4; otherwise, executing step S5;
s4, calculating reactance of the substation according to the fault data acquired in the step S1, and calculating the fault distance of the branch direct power supply traction network based on the reactance-distance corresponding relation of the branch direct power supply traction network;
and S5, calculating the fault distance of the full parallel AT power supply traction network by adopting the fault distance measuring principle of the AT neutral point absorption current ratio or the transverse connection current ratio.
2. The method for fault location of a branch direct power supply traction network in a full parallel AT power supply mode according to claim 1, wherein the step S1 specifically includes:
collecting T line voltage, F line voltage, downlink T line current, downlink F line current, uplink T line current and uplink F line current at the feeder side of a substation when a traction network fails;
collecting downlink T line current, downlink F line current, uplink T line current, uplink F line current and AT neutral point absorption current of an AT when a traction network fails;
and collecting downlink T line current, downlink F line current, uplink T line current, uplink F line current and AT neutral point absorption current of the subareas when the traction network fails.
3. The method for fault location of a branch direct power supply traction network in a full parallel AT power supply mode according to claim 2, wherein the step S2 specifically comprises the following sub-steps:
s21, calculating the current absorbed by the substation according to the fault data of the substation collected in the step S1;
s22, judging whether one of the effective values of the current absorbed by the substation, the AT station and the subarea station is larger than the current setting value of the T-F fault judgment; if yes, judging that the fault is not a T-F fault, and executing step S23; otherwise, executing step S5;
s23, judging whether the maximum value of the effective value of the 4-path feeder line current where the maximum effective value of the current is absorbed is T line current or not; if yes, the fault is judged to be a T-R fault, and step S3 is executed; otherwise, step S5 is executed.
4. The method for fault location of a branch direct power supply traction network in a full parallel AT power supply mode according to claim 3, wherein the calculation mode of the current drawn by the substation in the step S21 is as follows:
wherein the content of the first and second substances,
in order to draw up the current of the transformer substation,
、
、
、
the current is downlink T line current, downlink F line current, uplink T line current and uplink F line current of a feeder line of the substation.
5. The method for fault location of a branch direct power supply traction network in a full parallel AT power supply mode according to claim 4, wherein the step S3 specifically comprises the following sub-steps:
s31, determining a fault section according to the maximum current or the transverse connection line current of the substation, the AT station and the subarea station and the secondary maximum current or the transverse connection line current in the adjacent stations of the maximum current or the transverse connection line current, and executing the step S32 if the fault section comprises a branch direct power supply traction network access point; otherwise, executing step S5;
s32, calculating a current ratio according to the current absorbed or the transverse connection current at the two ends of the fault section determined in the step S31;
s33, judging whether the absolute value of the difference value between the current ratio and the current ratio setting value is smaller than a preset judgment threshold value; if yes, judging that the fault occurs on the branched direct power supply traction network, and executing step S4; otherwise, step S5 is executed.
6. The method for fault location of a branch direct power supply traction network in a full parallel AT power supply mode according to claim 5, wherein the step S4 specifically comprises the following sub-steps:
s41, calculating the reactance of the substation according to the T line voltage, the downlink T line current and the downlink F line current on the feeder side of the substation;
and S42, determining two corresponding distance points according to a pre-established reactance-distance relation table where the reactance of the substation is located, and calculating the fault distance of the branch direct power supply traction network.
7. The method for fault location of a branched direct power supply traction network under a full parallel AT power supply mode according to claim 6, wherein the reactance of the substation in the step S41 is calculated in a manner that:
wherein the content of the first and second substances,Xis the reactance of a power substation,
is the T-line voltage on the feeder side of the substation,
is the down-line T-line current of the substation,
and in the downlink F line current of the power substation, Im represents an imaginary part function.
8. The method for fault location of a branch direct power supply traction network in a full parallel AT power supply manner according to claim 7, wherein the fault distance in the step S42 is calculated in a manner that:
wherein the content of the first and second substances,Lin order to be the distance of the fault,
、
respectively reactance of substation
、
The two corresponding distance points are arranged in the distance measuring way,
、
two reactance values respectively corresponding to the reactance-distance relation table, an
。
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