CN113406444B - High-resistance fault identification method and system for traction network - Google Patents
High-resistance fault identification method and system for traction network Download PDFInfo
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- CN113406444B CN113406444B CN202110887035.1A CN202110887035A CN113406444B CN 113406444 B CN113406444 B CN 113406444B CN 202110887035 A CN202110887035 A CN 202110887035A CN 113406444 B CN113406444 B CN 113406444B
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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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- 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
- G01R31/088—Aspects of digital computing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- 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 method and a system for identifying a high-resistance fault of a traction network, which are characterized in that the current of a downlink feeder line and an uplink feeder line of a substation is collected in real time through a measurement and control protection device, and the distance to be measured is calculated and stored in real time according to the collected current of the downlink feeder line and the uplink feeder line; calculating a unit time and a distance variation value in the unit time according to the minimum running speed of the railway locomotive; and judging whether the high-resistance fault occurs in the traction network at the current moment according to the distance change value in unit time, and if the judgment result is the high-resistance fault, sending a high-resistance fault alarm instruction to the measurement and control protection device. According to the method, whether the traveling distance of the train changes within a certain time is judged according to the obvious difference between the relationship between the fault distance when the fault occurs and the load distance when the locomotive normally travels and the time when the high-resistance fault occurs in the multi-line direct supply traction network and the railway locomotive normally travels, so that whether the high-resistance fault occurs in the traction network at the current moment is identified, the judgment process is simple, and the accuracy is high.
Description
Technical Field
The invention relates to the technical field of electrified railway traction networks, in particular to a method and a system for identifying a high-resistance fault of a traction network.
Background
In the existing electrified railway, because the traction net is not standby and exposed in the nature, and the bow net is in high-speed contact, various faults are easy to occur, accidents are caused, and normal operation is influenced. When the electrified railway traction network has a high-resistance fault, the fault current is small, the fault voltage is reduced a little, and the measured impedance of the feeder line protection device is several times to ten times higher than that of the conventional fault, so that overcurrent protection, impedance protection and the like can not reliably and correctly act. The existing feeder line protection device sets current increment protection aiming at high resistance faults occurring in a complex line direct supply traction network, namely, the current increment between the current and the current increment before a power frequency period is calculated, and when the calculated current increment value is larger than a protection fixed value, the current increment protection is regarded as the high resistance fault. However, the railway load has the characteristics of moving current taking, large load current change and the like, so that high-resistance fault current and load current are not easy to distinguish, and the current increment protection action is insensitive. Therefore, the method has great significance for identifying the high-resistance fault, improving the transportation efficiency, timely removing the fault and timely maintaining the traction network so as to ensure the stable and safe operation of the railway.
Disclosure of Invention
The invention aims to solve the technical problem of how to improve the identification accuracy of the high-resistance fault of the traction network in the compound line direct supply mode, and aims to provide a method and a system for identifying the high-resistance fault of the traction network.
The invention is realized by the following technical scheme:
a traction network high-resistance fault identification method comprises the following steps:
step S1, collecting the current of a downlink feeder line and an uplink feeder line of a substation in real time through a measurement and control protection device, and calculating and storing the distance to be measured in real time according to the collected current of the downlink feeder line and the uplink feeder line;
s2, calculating unit time according to the minimum running speed of the railway locomotive, and calculating a distance change value in unit time according to the distance to be measured;
and S3, judging whether the high-resistance fault occurs in the traction network at the current moment in real time according to the distance change value in unit time, and if the judgment result is the high-resistance fault, sending a high-resistance fault alarm instruction to the measurement and control protection device.
The invention discloses a method for identifying a high-resistance fault of a multi-wire direct supply traction network, which is characterized in that the high-resistance fault is identified mainly by current increment protection, a current increment protection setting value is calculated according to the rated current of a single locomotive, but the high-resistance fault current is not easily distinguished from the load current due to the characteristics of moving current taking, large load current change and the like of a railway load, and the current increment protection action is insensitive. The judgment logic is simple, data in the substation are collected, and whether the high-resistance fault occurs in the traction network at the current moment can be quickly and accurately identified.
Further, in order to accurately distinguish the downlink feeder line current and the uplink feeder line current under the conditions of high-resistance faults and loads, when the downlink feeder line current and the uplink feeder line current of the substation are collected in the step S1, the collection frequency is greater than or equal to 50Hz, and the duration of the cache data is greater than or equal to 50S.
Further, the process of calculating the distance change value per unit time is:
calculating the distance D to be measured:
D＝Q×L
wherein L represents the distance from the substation of the traction network to the subarea station, I 1 、I 2 Dividing into down and up feeder currents of a substation; calculating a distance change value delta l in unit time:
Δl＝l Δt -l -Δt
wherein l Δt Represents the distance to be measured, l, calculated at the current time -Δt The distance to be measured at the last time before the current time in unit time is calculated, the calculation of the unit time is related to the running speed of the railway locomotive, the faster the speed is, the shorter the unit time is, the current running speed of the railway locomotive is between (40 and 300) km/h, and the distance is calculated according to the minimum speed of 40km/hAnd calculating unit time.
Further, the specific process of determining whether the high resistance fault occurs in the traction network at the current time in step S3 is as follows:
comparing the distance change value in the unit time obtained by calculation in the step S2 with a preset distance change threshold value, judging whether the distance change value at the current moment is smaller than the distance change threshold value, and setting the distance change threshold value in the unit time to be 500m by considering factors such as sampling, current transformer errors and the like;
when the distance change value is smaller than the distance change threshold value, judging that the traction network is in a high-resistance fault at the current moment; sending a high-resistance fault alarm instruction to the measurement and control protection device after a preset alarm time delay;
and when the distance change value is larger than the distance change threshold value, judging that the traction network is in load operation at the current moment.
Preferably, because the no-load current is far less than the rated current of the single locomotive, the high-resistance fault can be correctly judged as long as the current of the traction network exceeds the no-load current, so that the identification process has higher sensitivity, and the high-resistance fault of a large transition resistor can be identified, therefore, in order to prevent the condition when the traction network is no-load from being judged as the high-resistance fault, the judgment condition is set as:
if the following conditions are simultaneously satisfied: step S2, if the distance change value in unit time obtained by calculation is smaller than a preset distance change threshold value and the larger current value in the current of the downlink feeder line and the current of the uplink feeder line of the substation acquired in real time is larger than the no-load threshold current of the traction network, judging that the traction network is a high-resistance fault at the current moment, and sending a high-resistance fault alarm instruction to the measurement and control protection device after a preset alarm time delay; if not, judging that the traction network is in load operation at the current moment.
In addition, the invention provides a traction network high-resistance fault identification system which comprises a measurement and control protection device, a data processing unit, a storage unit, a logic judgment unit and an alarm unit, wherein the measurement and control protection device comprises a plurality of measurement and control units, a plurality of data processing units and a plurality of logic judgment units
The measurement and control protection device is used for collecting the current of a downlink feeder line and an uplink feeder line of a substation in real time and sending out fault alarm signals;
the data processing unit calculates the distance to be measured and the distance change value in unit time in real time according to the collected downlink feeder line current and uplink feeder line current, and the unit time is calculated according to the minimum running speed of the railway locomotive; the unit time is related to the running speed of the railway locomotive, and the unit time is shorter as the speed is higher. At present, the running speed of a railway locomotive is between 40 and 300 km/h, and unit time is calculated according to the minimum speed of 40 km/h;
the storage unit is used for storing the acquired downlink feeder line current and the uplink feeder line current of the substation, the distance to be measured obtained through real-time calculation, the distance change value in unit time, the distance change threshold value and the traction network no-load threshold current;
the logic judgment unit is used for judging whether the high-resistance fault occurs in the traction network at the current moment in real time, and if the judgment result is the high-resistance fault, a high-resistance fault alarm instruction is sent to the measurement and control protection device;
and the alarm unit is used for reminding an operator to carry out fault treatment according to the fault alarm signal.
Further, in order to accurately distinguish the downlink feeder line current and the uplink feeder line current under the conditions of high-resistance faults and loads, when the measurement and control device collects the downlink feeder line current and the uplink feeder line current of the substation, the collection frequency is greater than or equal to 50Hz, and the duration of the cache data is greater than or equal to 50s.
Further, the logic judgment unit judges according to the following criteria:
comparing the distance variation value in unit time with a pre-stored distance variation threshold value, judging whether the distance variation value at the current moment is less than the distance variation threshold value,
when the distance change value is smaller than the distance change threshold value, judging that the traction network is in a high-resistance fault at the current moment; sending a high-resistance fault alarm instruction to the measurement and control protection device after a preset alarm time delay;
and when the distance change value is larger than the distance change threshold value, judging that the traction network is in load operation at the current moment.
Preferably, because the no-load current is much smaller than the rated current of the single locomotive, the high-resistance fault can be correctly judged as long as the current of the traction network exceeds the no-load current, so that the identification process has higher sensitivity, and the high-resistance fault of a larger transition resistor can be identified, therefore, in order to prevent the condition of the traction network during no-load from being judged as the high-resistance fault, the judgment basis of the logic judgment unit is set as:
if the following conditions are simultaneously satisfied: if the distance change value in unit time is smaller than a preset distance change threshold value and the larger current value in the downlink feeder line current and the uplink feeder line current of the substation acquired in real time is larger than the prestored no-load threshold current of the traction network, judging that the traction network is a high-resistance fault at the current moment, and sending a high-resistance fault alarm instruction to the measurement and control protection device after a preset alarm time delay; if not, judging that the traction network is in load operation at the current moment.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the method and the system for identifying the high-resistance fault of the traction network, provided by the embodiment of the invention, the difference between the relation between the fault distance when the fault occurs and the load distance when the locomotive normally travels is obvious when the high-resistance fault occurs in the multi-line direct supply traction network and the locomotive travels, and whether the high-resistance fault occurs in the traction network is judged by identifying the difference;
2. the method and the system for identifying the high-resistance fault of the traction network provided by the embodiment of the invention have the advantages that the judgment error when the traction network is in no-load is prevented, the no-load current is far smaller than the rated current of a single locomotive, the high-resistance fault can be correctly judged as long as the current of the traction network exceeds the no-load current, the algorithm has higher sensitivity, and the high-resistance fault of a larger transition resistor can be identified.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic flow chart of a method provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of power supply of a complex-line direct supply traction network according to an embodiment of the present invention;
FIG. 3 is a graph of distance to failure versus time provided by an embodiment of the present invention;
FIG. 4 is a graph of load distance versus time provided by an embodiment of the present invention;
FIG. 5 is a block diagram of a system provided by an embodiment of the invention;
fig. 6 is a schematic diagram of a determination logic according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example" or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or examples are included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Example 1
As shown in fig. 1, a method for identifying a high resistance fault of a traction network according to an embodiment of the present invention includes the following steps:
step S1, collecting downlink and uplink feeder line currents of a substation in real time through a measurement and control protection device, and calculating and storing a distance to be measured in real time according to the collected downlink and uplink feeder line currents;
in order to accurately distinguish the downlink feeder line current and the uplink feeder line current under the conditions of high-resistance faults and loads, when the downlink feeder line current and the uplink feeder line current of a substation are collected, the collection frequency is greater than or equal to 50Hz, and the duration of the cache data is greater than or equal to 50s;
calculating the distance D to be measured:
D＝Q×L (1)
wherein L represents the distance from the substation of the traction network to the subarea station, I 1 、I 2 Dividing into down and up feeder currents of a substation;
s2, calculating unit time according to the minimum running speed of the railway locomotive, and calculating a distance change value in the unit time according to the distance to be measured;
calculating a distance change value delta l in unit time:
Δl＝l Δt -l -Δt
wherein l Δt Represents the distance to be measured, l, calculated at the current time -Δt The unit time is related to the running speed of the railway locomotive from the distance to be measured at the previous moment before the current moment in unit time, the unit time is shorter when the speed is higher, the running speed of the railway locomotive is between 40 and 300 km/h at present, and the unit time is calculated according to the minimum speed of 40 km/h; when calculating unit time, taking factors such as device sampling, current transformer error and the like into consideration, and taking the calculation distance as 0.5 \13214;
s3, judging whether the high-resistance fault occurs in the traction network at the current moment in real time according to the distance change value in unit time, and if the judgment result is the high-resistance fault, sending a high-resistance fault alarm instruction to the measurement and control protection device;
generally, when the condition of the traction network during no-load is not considered, the specific process of judging whether the high-resistance fault occurs in the traction network at the current moment is as follows:
comparing the distance change value in the unit time obtained by calculation in the step S2 with a preset distance change threshold value, judging whether the distance change value at the current moment is smaller than the distance change threshold value, and setting the distance change threshold value in the unit time to be 500m by considering factors such as sampling, current transformer errors and the like;
when the distance change value is smaller than the distance change threshold value, judging that the traction network is in a high-resistance fault at the current moment; sending a high-resistance fault alarm instruction to the measurement and control protection device after a preset alarm time delay;
and when the distance change value is larger than the distance change threshold value, judging that the traction network is in load operation at the current moment.
Preferably, because the no-load current is much smaller than the rated current of the single locomotive, the high-resistance fault can be correctly determined as long as the current of the traction network exceeds the no-load current, so that the identification process has higher sensitivity, and the high-resistance fault of a large transition resistor can be identified, therefore, in order to prevent the situation when the traction network is in the no-load state from being determined as the high-resistance fault and causing a determination error, the situation when the traction network is in the no-load state is eliminated, as shown in fig. 6, the specific process of determining whether the high-resistance fault occurs in the traction network at the current moment is as follows:
if the following conditions are simultaneously satisfied: the distance change value in unit time calculated in the step S2 is smaller than a preset distance change threshold value, and the larger current value in the downlink feeder line current and the uplink feeder line current of the substation acquired in real time is larger than I kz ，I kz Judging that the traction network is in a high-resistance fault at the current moment for the no-load threshold current of the traction network, and passing through a preset alarm time delay T set Sending a high-resistance fault alarm instruction to the measurement and control protection device; if the current time does not meet the requirement, judging that the traction network is in load operation at the current time, and setting the distance change threshold value within unit time to be 500m by considering factors such as sampling, current transformer errors and the like.
Example 2
As shown in fig. 5, this embodiment provides a system for identifying a high-resistance fault of a traction network, which includes a measurement and control protection device, a data processing unit, a storage unit, a logic determination unit, and an alarm unit, where the measurement and control protection device includes a first measurement and control unit, a second measurement and control unit, a logic determination unit, and a logic determination unit, where the logic determination unit includes a logic determination unit, and a logic determination unit
The measurement and control protection device is used for collecting the current of a downlink feeder line and an uplink feeder line of the substation in real time and sending out fault alarm signals;
the data processing unit calculates the distance to be measured and the distance change value in unit time in real time according to the collected downlink feeder line current and uplink feeder line current, and the unit time is calculated according to the minimum running speed of the railway locomotive; the unit time is related to the running speed of the railway locomotive, and the unit time is shorter as the speed is higher. At present, the running speed of a railway locomotive is between 40 and 300 km/h, and unit time is calculated according to the minimum speed of 40 km/h;
the storage unit is used for storing the acquired downlink feeder line current and the uplink feeder line current of the substation, the distance to be measured obtained through real-time calculation, the distance change value in unit time, the distance change threshold value and the traction network no-load threshold current;
the logic judgment unit is used for judging whether the high-resistance fault occurs in the traction network at the current moment in real time, and if the judgment result is the high-resistance fault, a high-resistance fault alarm instruction is sent to the measurement and control protection device;
and the alarm unit is used for reminding an operator to carry out fault treatment according to the fault alarm signal.
In order to accurately distinguish the downlink feeder line current and the uplink feeder line current under the conditions of high-resistance faults and loads, when the measurement and control device collects the downlink feeder line current and the uplink feeder line current of a substation, the collection frequency is greater than or equal to 50Hz, and the duration of the cache data is greater than or equal to 50s.
The judgment basis of the logic judgment unit is as follows:
comparing the distance variation value in unit time with a pre-stored distance variation threshold value, judging whether the distance variation value at the current moment is less than the distance variation threshold value,
when the distance change value is smaller than the distance change threshold value, judging that the traction network is in a high-resistance fault at the current moment; sending a high-resistance fault alarm instruction to the measurement and control protection device after a preset alarm time delay;
and when the distance change value is larger than the distance change threshold value, judging that the traction network is in load operation at the current moment.
Preferably, to prevent the judgment error when the traction network is unloaded, the judgment basis of the logic judgment unit is as follows:
if the following conditions are simultaneously satisfied: if the distance change value in unit time is smaller than a preset distance change threshold value and the larger current value of the downlink feeder line current and the uplink feeder line current of the substation acquired in real time is larger than the prestored no-load threshold current of the traction network, judging that the traction network is in a high-resistance fault at the current moment, and sending a high-resistance fault alarm instruction to the measurement and control protection device after a preset alarm time delay; and if the current time does not meet the preset time threshold, judging that the traction network is in load operation at the current time, and setting the distance change threshold value within the unit time to be 500m by considering factors such as sampling, current transformer errors and the like.
According to the structural characteristics of the compound-line direct-supply traction network, the high-resistance fault and the load current of the traction network in the compound-line direct-supply mode are accurately distinguished by calculating the change curve of the section current ratio and the distance in real time.The schematic power supply diagram of the complex line direct supply traction network is shown in fig. 2, wherein 1QF and 2QF are circuit breakers arranged at the downlink feeder line and the uplink feeder line of a substation, 3QF is a parallel circuit breaker arranged in a sub-district, and I 1 、I 2 Calculating the fault distance l at the current moment when high-resistance fault occurs at the d point of traction network for the downlink and uplink feeder current of the substation 1 And current I 1 、I 2 Satisfies the above formula (1) and formula (2), and the load distance l is calculated by using the above formula (1) and formula (2) during the normal running process of the traction network 2 In contrast, when the traction network has a high resistance fault, the locomotive cannot normally operate due to the fault of the traction network, so that the fault distance l at the moment 1 The fault distance l cannot be changed along with the increase of the time t 1 The functional relationship with time t is shown in fig. 3, if the locomotive moves back and forth when the traction network draws current, and the current of the downlink feeder line and the uplink feeder line changes along with the continuous movement of the train, the load distance l is 2 Will change along with the increase of the time t, and the load distance l 2 The function with time t is shown in fig. 4. As can be seen from fig. 3 and 4, when a high-resistance fault and a load occur in the multi-wire direct-supply traction network, the relationship between the fault distance and the load distance and the time are significantly different, and the above embodiments determine whether the high-resistance fault occurs in the traction network by identifying the difference. Compared with the current traction network high-resistance fault which is identified through current increment protection, and the current increment protection setting value is calculated according to the rated current of a single locomotive, the method can correctly judge the high-resistance fault as long as the current of the traction network exceeds the no-load current, can accurately distinguish the conditions of the high-resistance fault and the load operation, has higher sensitivity, and can identify the high-resistance fault of larger transition resistance.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A method for identifying a high-resistance fault of a traction network is characterized by comprising the following steps:
step S1, collecting the current of a downlink feeder line and an uplink feeder line of a substation in real time through a measurement and control protection device, and calculating and storing the distance to be measured in real time according to the collected current of the downlink feeder line and the uplink feeder line;
s2, calculating unit time according to the minimum running speed of the railway locomotive, and calculating a distance change value in unit time according to the distance to be measured;
s3, judging whether the high-resistance fault occurs in the traction network at the current moment in real time according to the distance change value in unit time, and if the judgment result is the high-resistance fault, sending a high-resistance fault alarm instruction to a measurement and control protection device;
the process of calculating the distance change value per unit time is as follows:
calculating the distance D to be measured:
D＝Q×L
wherein L represents the distance from the substation of the traction network to the subarea station, I 1 、I 2 Dividing into down and up feeder currents of a substation;
calculating a distance change value delta l in unit time:
Δl＝l Δt -l -Δt
wherein l Δt Represents the distance to be measured, l, calculated at the current time -Δt The distance to be measured is the distance to be measured from the last moment before the current moment in unit time;
the specific process of judging whether the high resistance fault occurs in the traction network at the current moment in the step S3 is as follows:
comparing the distance variation value in unit time calculated in the step S2 with a preset distance variation threshold value to judge whether the distance variation value at the current moment is smaller than the distance variation threshold value,
when the distance change value is smaller than the distance change threshold value, judging that the traction network is in a high-resistance fault at the current moment; sending a high-resistance fault alarm instruction to the measurement and control protection device after a preset alarm time delay;
when the distance change value is larger than the distance change threshold value, judging that the traction network is in load operation at the current moment;
in order to prevent the condition of the traction network during no-load from being judged as a high-resistance fault to cause judgment errors, the condition of the traction network during no-load is eliminated, and the specific process of judging whether the high-resistance fault occurs in the traction network at the current moment is as follows:
if the following conditions are simultaneously satisfied: the distance change value in unit time calculated in the step S2 is smaller than a preset distance change threshold value, and the larger current value in the downlink feeder line current and the uplink feeder line current of the substation acquired in real time is larger than I kz ，I kz Judging that the traction network is in a high-resistance fault at the current moment for the no-load threshold current of the traction network, and passing through a preset alarm time delay T set Sending a high-resistance fault alarm instruction to the measurement and control protection device; if not, judging that the traction network is in load operation at the current moment.
2. The method for identifying the high-resistance fault of the traction network according to claim 1, wherein when the currents of the downlink feeder line and the uplink feeder line of the substation are collected in the step S1, the collection frequency is greater than or equal to 50Hz, and the duration of the cache data is greater than or equal to 50S.
3. A traction network high-resistance fault identification system is characterized by comprising a measurement and control protection device, a data processing unit, a storage unit, a logic judgment unit and an alarm unit, wherein the measurement and control protection device comprises a power supply unit, a power supply unit and a power supply unit, the logic judgment unit comprises a power supply unit, a power supply unit and a power supply unit, the power supply unit is connected with the power supply unit, and the power supply unit is connected with the power supply unit
The measurement and control protection device is used for collecting the current of a downlink feeder line and an uplink feeder line of the substation in real time and sending out fault alarm signals;
the data processing unit calculates the distance to be measured and the distance change value in unit time in real time according to the collected downlink feeder line current and uplink feeder line current, and the unit time is calculated according to the minimum running speed of the railway locomotive;
the storage unit is used for storing the acquired downlink feeder current and the uplink feeder current of the substation, the distance to be measured obtained through real-time calculation, a distance change value in unit time, a distance change threshold value and a traction network no-load threshold current;
the logic judgment unit is used for judging whether the high-resistance fault occurs in the traction network at the current moment in real time, and if the judgment result is the high-resistance fault, a high-resistance fault alarm instruction is sent to the measurement and control protection device;
the alarm unit is used for reminding an operator to carry out fault treatment according to the fault alarm signal;
the process of calculating the distance change value per unit time is as follows:
calculating the distance D to be measured:
D＝Q×L
wherein L represents the distance from the substation of the traction network to the subarea station, I 1 、I 2 Dividing into down feeder line current and up feeder line current of a substation;
calculating a distance change value delta l in unit time:
Δl＝l Δt -l -Δt
wherein l Δt Represents the distance to be measured, l, calculated at the current time -Δt The distance to be measured is the distance to be measured from the last moment before the current moment in unit time;
the judgment basis of the logic judgment unit is as follows:
comparing the distance variation value in unit time with a pre-stored distance variation threshold value, judging whether the distance variation value at the current moment is less than the distance variation threshold value,
when the distance change value is smaller than the distance change threshold value, judging that the traction network is in a high-resistance fault at the current moment; sending a high-resistance fault alarm instruction to the measurement and control protection device after a preset alarm time delay;
when the distance change value is larger than the distance change threshold value, judging that the traction network is in load operation at the current moment;
in order to prevent the condition of the traction network during no-load from being judged as a high-resistance fault to cause judgment errors, the condition of the traction network during no-load is eliminated, and the specific process of judging whether the high-resistance fault occurs in the traction network at the current moment is as follows:
if the following conditions are simultaneously satisfied: the distance change value in unit time is smaller than a preset distance change threshold value, and the larger current value in the current of the downlink feeder line and the uplink feeder line of the substation acquired in real time is larger than I kz ，I kz Judging the traction network is a high-resistance fault at the current moment for the no-load threshold current of the traction network, and passing through a preset alarm time delay T set Sending a high-resistance fault alarm instruction to the measurement and control protection device; if not, judging that the traction network is in load operation at the current moment.
4. The system for identifying the high-resistance fault of the traction network according to claim 3, wherein when the measurement and control device collects currents of a downlink feeder line and an uplink feeder line of a substation, the collection frequency is greater than or equal to 50Hz, and the duration of the cached data is greater than or equal to 50s.
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