CN115173374A - Relay protection method, device, medium and equipment for traction power supply system - Google Patents
Relay protection method, device, medium and equipment for traction power supply system Download PDFInfo
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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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
- H02H7/28—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 for meshed systems
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Abstract
The disclosure relates to a method, a device, a medium and equipment for relay protection of a traction power supply system, wherein the method comprises the following steps: acquiring historical statistical values of line locomotive loads, wherein the historical statistical values are obtained based on historical monitoring values at a plurality of different moments in the historical driving process; determining a relay protection fixed value of the current increment based on the historical statistic value; adjusting a relay protection set value of the current increment based on the relay protection set value of the current increment; and the adjusted relay protection set value is greater than the relay protection set value. Therefore, the relay protection setting value of the current increment can be determined by combining with the historical statistical value of the load of the line locomotive, and then the relay protection setting value of the current increment is adjusted, so that the adjusted relay protection setting value is larger than the relay protection setting value, and therefore, the relay protection can be realized while the size of the relay protection setting value can be flexibly adjusted on the basis of the historical statistical condition, the relay protection can adapt to the relay protection requirement, the relay protection misoperation is avoided, the accuracy is improved, and the power supply and driving safety is improved.
Description
Technical Field
The disclosure relates to the technical field of traction power supply, and in particular to a method, a device, a medium and equipment for relay protection of a traction power supply system.
Background
With the development of traction power supply technology, the strategic trunk line of electrified railway transportation gradually extends, the train transportation order is continuously adjusted, and overload tripping sometimes occurs.
For example, with the gradual enrichment and complicated development of a trunk network, projects in a plurality of different areas are implemented successively, the rated current of an operating locomotive is larger and larger, the current setting value corresponding to the current increment protection action is correspondingly increased and even larger than the minimum metallic short-circuit current at the tail end of a contact network, so that the current increment protection can lose effect, even the contact network is disconnected, and the power supply and the driving safety are influenced.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the present disclosure provides a method, an apparatus, a medium, and a device for traction power supply system relay protection.
The present disclosure provides a relay protection method for a traction power supply system, including:
acquiring historical statistics of the load of the line locomotive; the historical statistical value is obtained by statistics based on historical monitoring values at a plurality of different moments in the historical driving process;
determining a relay protection fixed value of the current increment based on the historical statistic value;
adjusting a relay protection set value of the current increment based on the relay protection set value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value, and the relay protection setting value is a threshold value arranged in the relay protection device.
Optionally, the obtaining historical statistics of the line locomotive load includes:
and acquiring a traction characteristic curve and a locomotive scheduling table of the locomotive.
Optionally, the determining a relay protection fixed value of the current increment based on the historical statistical value includes:
determining the maximum traction force and the maximum acceleration in a single power frequency period based on the traction characteristic curve;
determining the maximum value of current increment in a single power frequency period based on the maximum value of the traction force and the maximum value of the acceleration;
determining the maximum value of the starting number of the locomotives on the traction power supply line based on the locomotive scheduling table;
and determining the relay protection fixed value based on the maximum value of the starting number of the locomotives and the corresponding maximum value of the current increment of each locomotive in a single power frequency period.
Optionally, the relay protection fixed value is equal to the product of the maximum value of the starting number of the locomotives and the maximum value of the current increment in a single power frequency period.
Optionally, the method further comprises:
determining voltage, current, impedance angle corresponding to the current increment protection trip and the distribution state of the locomotive in the traction power supply network based on the historical statistic values;
acquiring historical principle logic of current increment protection;
identifying error nodes of the historical principle logic based on voltage, current and impedance angle corresponding to current increment protection tripping and the distribution state of the locomotive in a traction power supply network;
and correcting the error node.
Optionally, the error node comprises a metering accumulation problem node for second harmonics and current increment values;
the correcting the faulty node comprises:
correcting the logic of the error node as: when the current increment measuring element acts and is accompanied by that the second harmonic is greater than the locking setting value, after the second harmonic is locked and returned, the current increment measuring element is cleared, and the measurement is restarted when the second harmonic is lower than the locking setting value.
The present disclosure also provides a relay protection device for a traction power supply system, including:
the first acquisition module is used for acquiring historical statistics of the load of the line locomotive; the historical statistical value is obtained by statistics based on historical monitoring values at a plurality of different moments in the historical driving process;
the first determining module is used for determining a relay protection fixed value of the current increment based on the historical statistic value;
the constant value adjusting module is used for adjusting the relay protection set value of the current increment based on the relay protection constant value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value, and the relay protection setting value is a threshold value arranged in the relay protection device.
Optionally, the first obtaining module is configured to obtain historical statistics of a line locomotive load, and specifically includes:
and acquiring a traction characteristic curve and a locomotive scheduling table of the locomotive.
Optionally, the first determining module is configured to determine a relay protection fixed value of the current increment based on the historical statistical value, and specifically includes:
determining the maximum traction force and the maximum acceleration in a single power frequency period based on the traction characteristic curve;
determining the maximum value of the current increment in a single power frequency period based on the maximum value of the traction force and the maximum value of the acceleration;
determining the maximum value of the starting number of the locomotives on the traction power supply line based on the locomotive scheduling table;
and determining the relay protection fixed value based on the maximum value of the starting number of the locomotives and the corresponding maximum value of the current increment of each locomotive in a single power frequency period.
Optionally, the relay protection fixed value is equal to the product of the maximum value of the starting number of the locomotives and the maximum value of the current increment in a single power frequency period.
Optionally, the apparatus further comprises:
the second determination module is used for determining the voltage, the current, the impedance angle corresponding to the current increment protection trip and the distribution state of the locomotive in the traction power supply network based on the historical statistic values;
the second acquisition module is used for acquiring historical principle logic of current increment protection;
the node identification module is used for identifying the error node of the historical principle logic based on the voltage, the current and the impedance angle corresponding to the current increment protection trip and the distribution state of the locomotive in the traction power supply network;
and the node correcting module is used for correcting the error node.
Optionally, the error node comprises a metering accumulation problem node for second harmonics and current increment values;
the node correcting module is configured to correct the faulty node, and specifically includes:
correcting the logic of the error node as: when the current increment measuring element acts and is accompanied by that the second harmonic is greater than the locking setting value, after the second harmonic is locked and returned, the current increment measuring element is cleared, and the measurement is restarted when the second harmonic is lower than the locking setting value.
The present disclosure also provides a computer readable medium, the storage medium storing a computer program for performing the steps of any one of the methods described above.
The present disclosure also provides an electronic device, including:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the steps of any of the above methods.
Compared with the prior art, the technical scheme provided by the disclosure has the following advantages:
the relay protection method for the traction power supply system comprises the following steps: acquiring historical statistical values of the load of the line locomotive, wherein the historical statistical values are obtained by statistics based on historical monitoring values at a plurality of different moments in the historical driving process; determining a relay protection fixed value of the current increment based on the historical statistic value; adjusting a relay protection set value of the current increment based on the relay protection set value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value, and the relay protection setting value is a threshold value arranged in the relay protection device. Therefore, the relay protection setting value of the current increment can be determined by combining the historical statistical value of the line locomotive load, and then the relay protection setting value of the current increment is adjusted, so that the adjusted relay protection setting value is larger than the relay protection setting value, and therefore, while relay protection is realized, the size of the relay protection setting value arranged in the relay protection device can be flexibly adjusted based on historical statistical conditions, the relay protection device can adapt to the relay protection requirement, misoperation of relay protection is avoided, accuracy is improved, and power supply and driving safety are improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for protecting a relay of a traction power supply system according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of change of power frequency 1 cycle current increment characteristics of a motor train unit according to an embodiment of the disclosure;
fig. 3 is a schematic flow chart of another relay protection method for a traction power supply system according to an embodiment of the present disclosure;
fig. 4 is a current variation curve of a substation provided in an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a power supply of a traction substation provided in an embodiment of the present disclosure;
FIG. 6 is a schematic logic diagram illustrating historical principles of current delta protection according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a relay protection device of a traction power supply system according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of another relay protection device for a traction power supply system according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Explanation of technical wording:
the purpose of the current increment protection, also called high-resistance grounding protection, is that when the traction network is subjected to high-resistance grounding, the current protection and the distance protection may not judge the occurrence of a fault and refuse to act, so the current increment protection is introduced, and an action characteristic element of the current increment protection always judges the current increment in a short time. When high-resistance grounding occurs, although the current is relatively small compared with that of a metallic short circuit, the increment of the short-circuit current is still existed, so that the high-resistance grounding fault can be judged by using the current increment protection. When the electric locomotive load starts, the current increment protection element can also measure the increase of the current of the traction network, and the current increment protection cannot be operated mistakenly because the electric locomotive is equivalent to a large inductor and the current increase rate of the electric locomotive is slower than the short-circuit fault current increase rate.
For the case where the current increment protection is disabled, such as the case shown in the background, or the following case: along with the extension of the strategic main line, the geological conditions of the place of part of lines are complex, the operation environment is severe, so that the traction power supply equipment can be influenced by factors such as the falling of an upper span line, the lodging of trees and bamboos, flood disasters, lightning impact and the like, the high-resistance grounding fault of a contact network is caused to happen very easily, and the power supply and driving safety can be influenced. The embodiment of the disclosure provides a method for improving a current increment protection function in a traction power supply system, such as a high-speed rail traction substation, which solves the problem of poor reliability of current increment protection action in the case of a high-resistance ground fault of an electrified railway. Specifically, the method provided by the embodiment of the disclosure determines a relay protection setting value of a current increment through steps such as statistical calculation by using relevant data of the current increment in the operation process of a traction power supply system (including a traction substation), and adjusts the relay protection setting value to the relay protection setting value, so as to realize adjustment of a current increment protection function and improve reliability; meanwhile, historical principle logic of current increment protection is corrected by using historical statistical data, which is equivalent to upgrading of software programs and/or hardware logic corresponding to the current increment protection, so that the reliability and the sensitivity of the current increment protection are improved, and the running safety of a traction power supply system is ensured.
The following describes an example of a method, an apparatus, a medium, and a device for relay protection of a traction power supply system according to an embodiment of the present disclosure with reference to the accompanying drawings.
In some embodiments, fig. 1 is a schematic flowchart of a method for relay protection of a traction power supply system according to an embodiment of the present disclosure. As shown in fig. 1, the relay protection method for the traction power supply system includes the following steps:
and S110, acquiring historical statistics of the load of the locomotive on the line.
Specifically, the lines refer to all driving lines corresponding to the traction power supply system, and the locomotives include all electric locomotives operating on the lines corresponding to the traction power supply system. The historical statistical value of the line locomotive load is obtained based on the historical monitoring values at a plurality of different moments in the historical driving process, and may include the historical monitoring values in the operation process of the locomotive, such as current values, voltage values, characteristic curves, scheduling conditions and other real-time monitoring quantities, and the result of performing classification statistics based on the historical monitoring values, or may also include the result obtained by performing simple mathematical operation based on the historical monitoring values, which is not limited herein.
Typically, historical statistics are stored in a memory for backtracking.
In this step, the historical statistics may be retrieved from memory for use in subsequent steps.
And S120, determining a relay protection fixed value of the current increment based on the historical statistical value.
Specifically, data statistics is carried out on the basis of historical statistical values, and a relay protection fixed value of the current increment is determined. The relay protection fixed value is a fixed value that does not cause malfunction or rejection while realizing current increment protection, and may be a current value, and a specific implementation process of this step will be exemplarily described later.
S130, adjusting a relay protection set value of the current increment based on the relay protection set value of the current increment; and the adjusted relay protection set value is greater than the relay protection set value.
Specifically, the relay protection setting value is a threshold set in the relay protection device, that is, the relay protection setting value of the current increment is an originally set current value corresponding to the current increment protection, and when the value is too small, a malfunction may be caused, thereby causing poor accuracy of the current increment protection. In the step, the relay protection setting value of the current increment is adjusted to be a current value larger than the relay protection setting value, so that misoperation can be avoided, namely the relay protection setting value is flexibly adjusted based on historical statistics, so that the relay protection setting value is adaptive to relay protection requirements, misoperation of relay protection is avoided, accuracy is improved, and power supply and driving safety are improved.
For example, the relay protection setting value may be adjusted by directly changing a corresponding current value to a current value greater than the relay protection setting value, which is described in the following exemplary description.
The relay protection method for the traction power supply system can determine the relay protection setting value of the current increment by combining the historical statistical value of the load of the line locomotive, and further adjust the relay protection setting value of the current increment to enable the adjusted relay protection setting value to be larger than the relay protection setting value, so that the relay protection can be realized, meanwhile, the size of the relay protection setting value can be flexibly adjusted based on the historical statistical condition, the relay protection requirement can be adapted to, the misoperation of relay protection is avoided, the accuracy is improved, and the safety of power supply and driving is improved.
In some embodiments, on the basis of fig. 1, the obtaining the historical statistical value of the line locomotive load in S110 may specifically include: and acquiring a traction characteristic curve and a locomotive schedule of the locomotive.
Specifically, the traction characteristic curve is a curve for representing the traction characteristics of the locomotive, and physical quantities such as traction force, acceleration and the like related to the dynamics of the locomotive can be determined, so that the maximum value of the current increment is determined; meanwhile, the running scheduling arrangement of the locomotive can be determined by combining the locomotive scheduling table, so that all the locomotives dragged in a single power frequency period are determined, and the relay protection fixed values corresponding to the current increment protection functions are determined by combining the maximum current increment values corresponding to the locomotives.
In some embodiments, determining a relay protection setting for the current increment based on historical statistics comprises:
determining the maximum value of the traction force and the maximum value of the acceleration in a single power frequency period based on the traction characteristic curve;
determining the maximum value of current increment in a single power frequency period based on the maximum value of the traction force and the maximum value of the acceleration;
determining the maximum value of the starting number of the locomotives on the traction power supply line based on the locomotive scheduling table;
and determining a relay protection fixed value based on the maximum value of the starting number of the locomotives and the corresponding maximum value of the current increment of each locomotive in a single power frequency period.
Specifically, before adjusting the relay protection setting value of the current increment, determining a corresponding relay protection setting value; in order to determine the relay protection fixed value, firstly, the maximum value of the current increase of the locomotive in a contact network is determined; and then, counting the maximum current increment finger by combining with a locomotive schedule, wherein the specific statistical mode can be summation or multiplication, and a relay protection fixed value is obtained.
Exemplarily, fig. 2 is a schematic diagram of a change of a power frequency 1 cycle current increment characteristic of a motor train unit, which is provided by the embodiment of the present disclosure and corresponds to a traction characteristic curve of a locomotive.
According to the traction characteristic curve of the motor train unit, the time period when the locomotive generates the maximum current increment in the catenary generally occurs in the starting stage, such as the starting acceleration stage of 0-50 km/h. Specifically, the maximum traction force and the maximum acceleration appear in the starting acceleration stage by inquiring the traction characteristic curve of the motor train unit. Therefore, on the basis of the traction characteristic curve, the maximum traction force value and the maximum acceleration value in a single power frequency period can be determined through curve query or data comparison. Furthermore, the maximum value of the traction force and the maximum value of the acceleration also correspond to the maximum value of the current increment, so that the maximum value of the current increment in a single power frequency period can be determined after the maximum value of the traction force and the maximum value of the acceleration are determined.
Illustratively, the maximum current increment value can be obtained by combining the acceleration times in a single power frequency period of the motor train unit as follows:
wherein F represents traction force, a represents acceleration, roundup (20/t 1, 0) represents the cycle number obtained by rounding up 20/t1 and is reserved to 0 bit after decimal point; t1 represents the duration of a single acceleration period and 20 represents the total duration of a power frequency period. Therefore, by combining the acceleration interval time of the motor train unit, the relationship between the power corresponding to the traction force and the acceleration and the relationship between the power corresponding to the voltage and the current are utilized, the association relationship among the traction force, the deceleration, the current and the voltage can be obtained, and the maximum value of 1 power frequency cycle current increment during the starting of the motor train unit can be calculated.
Exemplarily, table 1 shows the maximum current increment values at the start of different types of motor train units.
TABLE 1 maximum Current increment at Start of different locomotives List
The Fluke435II and E6100 power quality analyzers are adopted to test the starting current change characteristics of the CRH1 type motor train unit at the head ends of the corresponding feed lines of the traction substation, as shown in FIG. 2. Therefore, the following steps are carried out: when the CRH1 motor train unit is started at the tail end of a feeder line, the maximum value of the current increment of 1 power frequency period obtained by testing is 11.3A, the error between the current increment and the calculated value (namely 9.22A) in the table 1 is 2.08A, and the current difference of 2.08A can correspond to partial current of voltage loss of a contact network; when the CRH2 type motor train unit is started at the tail end of a feeder line, the maximum value of the current increment of 1 power frequency period obtained by testing is 4.08A, the error between the current increment and the calculated value (namely 3.43A) in the table 1 is 0.65A, and the current difference value of 0.65A can correspond to partial current of the voltage loss of a contact network; when the CRH3 motor train unit is started at the tail end of a feeder line, the maximum value of current increment in 1 power frequency period obtained through testing is 7.03A, the error between the current increment and a calculated value (namely 6.24A) in a table 1 is 0.79A, and the current difference value of 0.79A can correspond to partial current of voltage loss of a contact network; when the CR400AF motor train unit is started at the tail end of a feeder line, the maximum value of the current increment of 1 power frequency period obtained through testing is 6.48A, the error between the current increment and the calculated value (namely 5.62A) in the table 1 is 0.86A, and the current difference value of 0.86A can correspond to partial current of voltage loss of a contact network; when the CRH380A motor train unit is started at the tail end of a feeder line, the maximum value of current increment of 1 power frequency period obtained through testing is 4.72A, the error between the current increment and a calculated value (namely 4.46A) in a table 1 is 0.26A, and the current difference value of 0.26A can correspond to partial current of voltage loss of a contact net; therefore, when the voltage loss of the overhead line system is taken into consideration, the current calculated by the formula 1 is accurate, so that the correctness of the formula 1 can be verified. The voltage loss of the catenary is a voltage loss corresponding to parameters such as resistance of the catenary itself, and is numerically equal to an arithmetic difference between a voltage amplitude of a feeder line of the traction power transformer and a voltage amplitude of a pantograph of the locomotive, and corresponds to a difference of currents.
Therefore, the maximum traction force value and the maximum acceleration value are determined based on the traction characteristic curve of the motor train unit, and the maximum current increment value is further determined.
It can be understood that the example in table 1 is only used as an example to verify the correctness of formula 1, and does not limit formula 1, and does not affect the universality thereof.
On the basis, the maximum increment value of the load current of the overhead line system is further determined by combining a locomotive schedule table, namely a relay protection fixed value is determined.
Specifically, after the maximum value of the starting current increment of the single-train motor train unit is determined, the maximum starting number of the motor train units with the largest feeders can be determined by combining the locomotive dispatching table, and then the maximum value of the current increment generated by normal load is estimated.
Exemplarily, the maximum traveling quantity of the same feeder line can be determined according to the length of the corresponding feeder line of the traction substation, the running average speed of the motor train unit and the tracking interval time, and the maximum increment value of the load current of the overhead contact system can be further determined by combining the maximum increment value of the current of a single locomotive.
Illustratively, when the maximum number of trains in the same feeder is 2, the maximum value of the starting current increment of the CH1 single-train locomotive is calculated to be 368.8A, namely 368.8a =9.22a × 40 according to the current increment setting requirement and by referring to table 1, where 40 is the acceleration time statistic value in the acceleration period. The maximum value of the current increment corresponding to two-column reconnection is 737.6A, namely 737.6A =368.8A × 2.
Thereby, the relay protection constant value is determined.
It can be understood that, under the condition of fully considering the current-carrying capacity of the main conductive loop device of the traction power supply system, the relay protection set value can be adjusted to a current value slightly larger than the relay protection set value. For example, if the current increase protection constant value of the traction power converter before adjustment is 600A, which is smaller than the maximum current increase value 737.6A corresponding to the two-column double-coupling obtained above, it is necessary to increase the current value, and replace the original current value with the increased current value, so as to realize the current increase protection without malfunction, and in this case, the increased current value needs to be larger than 737.6A and not excessively large. For example, the increased current value may be 750A, which is a current value obtained by setting a single programmed current increment maximum value.
In some embodiments, the relay protection setting is equal to the product of the maximum number of locomotives started and the maximum current increment within a single power frequency cycle.
In combination with the above, when two trains are connected in series, the relay protection setting value is equal to the maximum value of the current increment in a single power frequency period multiplied by two.
In other embodiments, when the maximum current increment values of the trains started at the same time are different from each other and have a large difference, the maximum current value of the trains started at the same time may be summed to obtain a corresponding relay protection fixed value, which is not limited herein.
In some embodiments, fig. 3 is a schematic flowchart of another relay protection method for a traction power supply system according to an embodiment of the present disclosure. On the basis of fig. 1, with reference to fig. 3, the method further comprises the steps of:
and S150, determining the voltage, the current, the impedance angle and the distribution state of the locomotive in the traction power supply network corresponding to the current increment protection trip based on the historical statistical values.
Specifically, the voltage and current data can be analyzed based on historical statistical values, and the impedance angle and the distribution state of the locomotive in the traction power supply network can be analyzed so as to verify the historical principle logic of the current increment protection, identify and correct error nodes in the historical principle logic, and optimize the principle logic of the current increment protection (namely corresponding software programs and/or hardware logic) so as to improve the accuracy of the current increment protection.
And S160, acquiring historical principle logic of current increment protection.
Wherein the historical principle logic is the software program and/or hardware logic to be optimized.
In this step, the historical principle logic of the current increment protection is acquired so as to identify and correct the error node in combination with the analysis in S150.
For example, S160 may be executed before S170, and S150 may be executed after S110, but: the precedence relationship between S160 and S150 is not limited, and the precedence relationship between S160 and S110 is not limited.
And S170, identifying error nodes of historical principle logic based on voltage, current and impedance angle corresponding to the current increment protection tripping and the distribution state of the locomotive in the traction power supply network.
And S180, correcting the error node.
Specifically, the voltage, current and impedance angle corresponding to the current increment protection trip and the distribution state of the locomotive in the traction power supply network are combined to identify and correct error nodes in the historical principle logic, so that the optimization of the software program and/or hardware logic corresponding to the current increment protection is realized.
The optimization process is illustrated below with reference to examples.
Table 2 shows a trip data table corresponding to the current increment protection, and table 3 shows a distribution state table of the locomotive in the traction power supply network, correspondingly shows the distribution condition of the locomotive in a section at the trip time, namely shows the information of the line train when the CTC replays the trip; fig. 4 is a current variation curve of a substation provided in an embodiment of the present disclosure; where 71 represents 213 the feeder current IF, with a maximum value of 393A and a minimum value of 3A;72 represents 213 the feeder current IT, with a maximum value of 567A and a minimum value of 4A;73 represents 212 the feeder current IT, with a maximum value of 931A and a minimum value of 4A;74 represents 212 the feeder current IF, with a maximum value of 389A and a minimum value of 3A. Fig. 5 is a schematic diagram of power supply of a traction substation provided in an embodiment of the present disclosure.
Based on the analysis of the data shown in table 2, it can be seen that: when a feeder line of a traction substation trips, the bus voltage basically does not drop greatly, and meanwhile, both the uplink breaker and the downlink breaker trip, and when the latter trips, the fault current is large, and reclosing is unsuccessful.
TABLE 2 trip data sheet corresponding to current increment protection
TABLE 3 distribution state table of locomotive in traction power supply network
The impedance angle and the locomotive schedule are analyzed, the load impedance angle of the AC/DC electric locomotive is generally below 20 degrees, and the real-time data of the locomotive corresponding to the line is called and searched to obtain the impedance angle: the load impedance angle of the locomotive corresponding to the line is 70 degrees. Based on the analysis of the data shown in tables 2 and 3, it can be seen that: 3 electric locomotives are arranged on the power supply arm at the 1 st trip time, 3 th trip time and 7 th trip time 212, 1 electric locomotive is arranged in the power supply arm at the rest 5 trip times, and the comprehensive analysis in combination with the figure 4 and the figure 5 shows that: and (3) tripping time: the locomotive just leaves the station and trips when in the current-taking acceleration stage, and the tripping impedance angle accords with the load angle of the locomotive.
The trip of the power supply arms of the transformer substations 212 and 213 and the train operation data of 14 days in 7 months and 7 months in 2018 in table 2 are taken as examples for analysis, and the following steps are carried out: at the moment of 212QF trip at 53 minutes and 55 seconds at 09 hours, D2992 (CRH 2A reconnection), D1852 (CRH 2A reconnection) and G2902 (CRH 380 AL) 3 are arranged below a 212KX power supply arm, and G2907 (CRH 380A reconnection) 1 is arranged below a 213KX power supply arm.
According to the related technical data, the traction power corresponding to CRH2A reconnection is 9600kW, and is converted into rated current which is about 384A; CRH380AL corresponds to a traction power of 21560kW, converted to a rated current, of about 862.4A; the traction power corresponding to CRH380A reconnection is 19200kW, and is converted into rated current, which is about 768A.
As can be seen in the power supply diagram of the substation shown in fig. 5: the distance between the second subarea and the current station is about 18km, the time of the trip time G2902 when the motor train unit is about 9 minutes away from the scheduled arrival of the current station is calculated according to the running speed per hour of the motor train unit being 250km/h, and the motor train unit can approach about 37 km; therefore, it can be judged that the motor train unit just enters the feeder line power supply arm range of the current substation 212 through the split phase of the 214KX power supply arm of the adjacent previous substation passing through the second partition, at this time, the current borne by 212KX is mutated into 815.2A (i.e. 815.2A =384A/2+ 384A/2) from the original 384A (i.e. 384A = 384A.4A/2), and 815.2A is greater than the 212QF current increment protection set value (i.e. 600A), so that the 212KX current increment protection is led to the action outlet first (53 minutes 58 seconds 375 at action time 09); at the moment when the motor train unit just runs out of the current station to take current and accelerate speed, and 212KX trips instantly, 815.2A load originally borne by 212KX (about instant rotation to 213KX, load current reaches 1583.2A (namely 768a +815.2a = 1583.2a), so that 213QF current increment protection action is output (53 minutes, 59 seconds 152 at the action time of 09).
Fig. 6 is a logic diagram illustrating a historical principle of current increment protection according to an embodiment of the present disclosure. Referring to fig. 6, considering only current, G2902 brings about a current break of only 431.2A (i.e., 862.4A/2), which is less than the current increment set point 600A, so the 212 feeder should not trip instantaneously when G2902 enters, but actually trips. The problem of metering superposition of the programs and/or logics built into the protection device and related to the current increment protection is determined.
Referring to fig. 6, considering the harmonic influence of the electric locomotive, the harmonic blocking criterion of the original protection program, I2/I1, is "not" similar to a long closed contact, when the second harmonic is greater than or equal to the setting value KYL, the node is opened, and the current increment protection is not released (the related state of the current increment value and the starting state of the time relay are not explained in the inquiry and protection device specification); when the second harmonic is smaller than the locking setting value, I2/I1 is unlocked, the node is closed, and meanwhile, when the current increment value delta I is larger than or equal to the setting value delta IZD, the normally open contact for reflecting the current increment is closed and is kept until the protection outlet is powered off and returns. Therefore, when the locomotive is started or the current taking is accelerated, and the current increment value delta I is greater than or equal to the setting value delta IZD for the first time, the normally open contact reflecting the current increment is closed, the time relay is started, and when the current duration is greater than or equal to the setting value of the current increment time relay, the current increment protection can be started once as long as the current increment is greater than or equal to the setting value once.
Accordingly, in some embodiments, the error node comprises a metric accumulation problem node for the second harmonic and the current delta value. Therefore, in the flow shown in fig. 3, the correcting the error node in S180 may specifically include:
the logic of the faulty node is corrected to: when the current increment measuring element acts and is accompanied by that the second harmonic is greater than the locking setting value, after the second harmonic is locked and returned, the current increment measuring element is cleared, and the measurement is restarted when the second harmonic is lower than the locking setting value.
In particular, the optimization of the software program and/or the hardware logic for the current delta protection may modify the logical relationship of the current delta protection with respect to the systematic defects of the protection device function identified above, namely: when the current increment measuring element acts and is accompanied by that the second harmonic is greater than the locking setting value, after the second harmonic locking returns, the current increment measuring element is cleared (the normally open contact which reflects the current increment returns), and the measurement is restarted when the second harmonic is lower than the locking setting value.
The method provided by the embodiment of the disclosure is mainly suitable for improving the relay protection function of the high-speed rail traction power supply system, namely, the current increment set value of the traction power substation is adjusted according to the maximum increment in a power frequency period when the load current of the line is avoided by combining the actual load condition of the line corresponding to the traction power supply system, and the current increment protection program is optimized. Specifically, on the basis of a given set value of the relay protection of the traction substation, the set value of the current increment of a feeder line of the substation is adjusted according to the actual change of the load of a line locomotive, so that the sensitivity and reliability of the relay protection of a traction power supply system are ensured, and the power supply and driving safety are ensured; and the existing program algorithm and/or hardware logic of the incremental protection of the feeder line current of the traction substation are corrected and optimized, the phenomena of power supply interruption of a contact network and interference of the train order caused by relay protection misoperation, refusal and the like caused by the running of a high-power locomotive are prevented, the reliability of the relay protection of the traction substation is improved, and a powerful basic guarantee is provided for the safe running of traction power supply equipment.
The method provided by the embodiment of the disclosure perfects and improves the relay protection function of the traction substation, effectively ensures the safe and stable operation of a high-speed rail traction power supply system, prevents the fault of the traction power supply equipment from being enlarged, reduces the interference of the fault of the power supply equipment on the sequence of the train, improves the operation and maintenance management level of the equipment, and has strong operability and convenience for organization and implementation.
It can be understood that, in order to ensure safety and not affect train operation, the method can be performed after train operation is finished at night, for example, the current increment protection device function and the protection action program corresponding to the traction power supply system are checked, and the current increment protection program upgrading and the set value modification are performed at a "skylight point".
It can be understood that before the modification of the set values and the program (and/or logic optimization) are carried out on the site of the traction substation, debugging preparation is also needed; thereafter, experimental verification may also be performed to ensure accuracy and safety.
The embodiment of the disclosure further provides a relay protection device for a traction power supply system, which is used for executing the steps of any one of the methods provided by the above embodiments, and has a corresponding effect.
In some embodiments, fig. 7 is a schematic structural diagram of a relay protection device of a traction power supply system according to an embodiment of the present disclosure. Referring to fig. 7, the traction power supply system relay protection device may include: a first obtaining module 310, configured to obtain historical statistics of a line locomotive load; a first determining module 320, configured to determine a relay protection setting value of the current increment based on the historical statistical value; the fixed value adjusting module 330 is configured to adjust a relay protection set value of the current increment based on the relay protection fixed value of the current increment; and the adjusted relay protection set value is larger than the relay protection set value.
According to the relay protection device of the traction power supply system, through the synergistic effect of the functional modules, the relay protection setting value of the current increment can be determined by combining historical statistical values of the load of the line locomotive, and then the relay protection setting value of the current increment is adjusted, so that the adjusted relay protection setting value is larger than the relay protection setting value, relay protection is achieved, meanwhile, the size of the relay protection setting value can be flexibly adjusted based on historical statistical conditions, relay protection requirements are met, misoperation of relay protection is avoided, accuracy is improved, and power supply and driving safety is improved.
In some embodiments, the first obtaining module 310 is configured to obtain historical statistics of the load of the locomotive on the line, and specifically includes: and acquiring a traction characteristic curve and a locomotive scheduling table of the locomotive.
In some embodiments, the first determining module 320 is configured to determine the relay protection setting value of the current increment based on the historical statistical value, and specifically includes: determining the maximum value of the traction force and the maximum value of the acceleration in a single power frequency period based on the traction characteristic curve; determining the maximum value of current increment in a single power frequency period based on the maximum value of the traction force and the maximum value of the acceleration; determining the maximum value of the starting number of the locomotives on the traction power supply line based on the locomotive scheduling table; and determining a relay protection fixed value based on the maximum value of the starting number of the locomotives and the corresponding maximum value of the current increment of each locomotive in a single power frequency period.
In some embodiments, the relay protection setpoint is equal to the product of the maximum number of locomotives started and the maximum current increment over a single power frequency cycle.
In some embodiments, fig. 8 is a schematic structural diagram of another relay protection device for a traction power supply system according to an embodiment of the present disclosure. On the basis of fig. 7, referring to fig. 8, the apparatus further includes: a second determination module 360, configured to determine, based on the historical statistical values, a voltage, a current, an impedance angle corresponding to the current delta protection trip, and a distribution state of the locomotive in the traction power supply network; a second obtaining module 350, configured to obtain historical principle logic of current increment protection; a node identification module 370, which is used for identifying the error node of the historical principle logic based on the voltage, the current and the impedance angle corresponding to the current increment protection trip and the distribution state of the locomotive in the traction power supply network; a node correcting module 380 for correcting the error node.
In some embodiments, the error node comprises a meter accumulation problem node for the second harmonic and the current delta value; the node correcting module 380 is used for correcting a faulty node, and specifically includes: the logic of the faulty node is corrected to: when the current increment measuring element acts and is accompanied by that the second harmonic is greater than the locking setting value, after the second harmonic is locked and returned, the current increment measuring element is cleared, and the measurement is restarted when the second harmonic is lower than the locking setting value.
It can be understood that the relay protection device for a traction power supply system provided in the embodiment of the present disclosure can perform the steps of any one of the methods in the foregoing embodiments, and has corresponding effects, which are not described herein again.
The present disclosure also provides an electronic device, including: a processor; a memory for storing processor-executable instructions; the processor is configured to read executable instructions from the memory and execute the instructions to implement the steps of any of the methods described above to achieve a corresponding effect.
In some embodiments, fig. 9 is a schematic structural diagram of an electronic device provided in an embodiment of the present disclosure, which shows a schematic structural diagram of an electronic device 500 suitable for implementing an embodiment of the present disclosure. The electronic device 500 in the disclosed embodiment may include, but is not limited to, a mobile terminal such as a mobile phone, a notebook computer, a digital broadcast receiver, a PDA (personal digital assistant), a PAD (tablet computer), a PMP (portable multimedia player), a vehicle terminal (e.g., a car navigation terminal), and the like, and a stationary terminal such as a digital TV, a desktop computer, and the like. The electronic device shown in fig. 9 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present disclosure.
As shown in fig. 9, the electronic device 500 may include a processing means (e.g., central processing unit, graphics processor, etc.) 501 that may perform various appropriate actions and processes in accordance with a program stored in a read only memory ROM502 or a program loaded from a storage means 508 into a random access memory RAM 503. In the RAM503, various programs and data necessary for the operation of the electronic apparatus 500 are also stored. The processing device 501, the ROM502, and the RAM503 are connected to each other through a bus 504. An input/output I/O interface 505 is also connected to bus 504.
Generally, the following devices may be connected to the I/O interface 505: input devices 506 including, for example, a touch screen, touch pad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc.; output devices 507 including, for example, a Liquid Crystal Display (LCD), speakers, vibrators, and the like; storage devices 508 including, for example, magnetic tape, hard disk, etc.; and a communication device 509. The communication means 509 may allow the electronic device 500 to communicate with other devices wirelessly or by wire to exchange data. While fig. 9 illustrates an electronic device 500 having various means, it is to be understood that not all illustrated means are required to be implemented or provided. More or fewer devices may alternatively be implemented or provided.
In particular, according to an embodiment of the present disclosure, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program carried on a non-transitory computer readable medium, the computer program containing program code for performing the method illustrated by the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication means 509, or installed from the storage means 508, or installed from the ROM 502. The computer program, when executed by the processing device 501, performs the above-described functions defined in the methods of the embodiments of the present disclosure.
It should be noted that the computer readable medium of the present disclosure may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In contrast, in the present disclosure, a computer readable signal medium may comprise a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.
In some embodiments, the clients, servers may communicate using any currently known or future developed network Protocol, such as HTTP (Hyper Text Transfer Protocol), and may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), the Internet (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed network.
The computer readable medium may be embodied in the electronic device; or may be separate and not incorporated into the electronic device.
The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: acquiring historical statistics of the load of the line locomotive; determining a relay protection fixed value of the current increment based on the historical statistic value; adjusting a relay protection set value of the current increment based on the relay protection set value of the current increment; and the adjusted relay protection set value is larger than the relay protection set value. The relay protection setting value of the current increment can be determined by combining the historical statistical value of the load of the line locomotive, and then the relay protection setting value of the current increment is adjusted, so that the adjusted relay protection setting value is larger than the relay protection setting value, the relay protection can be realized, meanwhile, the size of the relay protection setting value can be flexibly adjusted based on the historical statistical condition, the relay protection can adapt to the relay protection requirement, the misoperation of the relay protection is avoided, the accuracy is improved, and the safety of power supply and driving is improved.
Computer program code for carrying out operations for aspects of the present disclosure may be written in any combination of one or more programming languages, including but not limited to an object oriented programming language such as Java, smalltalk, C + +, including conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present disclosure may be implemented by software or hardware. Where the name of an element does not in some cases constitute a limitation on the element itself.
The functions described herein above may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems on a chip (SOCs), complex Programmable Logic Devices (CPLDs), and the like.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The previous description is only for the purpose of describing particular embodiments of the present disclosure, so as to enable those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A relay protection method for a traction power supply system is characterized by comprising the following steps:
acquiring historical statistical values of the load of the line locomotive; the historical statistical value is obtained by statistics based on historical monitoring values at a plurality of different moments in the historical driving process;
determining a relay protection fixed value of the current increment based on the historical statistic value;
adjusting a relay protection set value of the current increment based on the relay protection set value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value, and the relay protection setting value is a threshold value arranged in a relay protection device;
the method further comprises the following steps:
determining voltage, current, impedance angle corresponding to the current increment protection tripping operation and the distribution state of the locomotive in the traction power supply network based on the historical statistic value;
acquiring historical principle logic of current increment protection;
identifying error nodes of the historical principle logic based on voltage, current and impedance angle corresponding to current increment protection tripping and the distribution state of the locomotive in a traction power supply network;
and correcting the error node.
2. The method for protecting relay in a traction power supply system according to claim 1, wherein the obtaining historical statistics of the load of the line locomotive comprises:
and acquiring a traction characteristic curve and a locomotive scheduling table of the locomotive.
3. The traction power supply system relay protection method according to claim 2, wherein the determining a relay protection fixed value of the current increment based on the historical statistical value comprises:
determining the maximum traction force and the maximum acceleration in a single power frequency period based on the traction characteristic curve;
determining the maximum value of current increment in a single power frequency period based on the maximum value of the traction force and the maximum value of the acceleration;
determining the maximum value of the starting number of the locomotives on the traction power supply line based on the locomotive scheduling table;
and determining the relay protection fixed value based on the maximum value of the starting number of the locomotives and the corresponding maximum value of the current increment of each locomotive in a single power frequency period.
4. The traction power supply system relay protection method according to claim 3, wherein the relay protection setting value is equal to a product of a maximum value of the number of starting locomotives and a maximum value of a current increment in a single power frequency cycle.
5. The traction power supply system relay protection method according to claim 4, wherein the error node comprises a metering accumulation problem node for a second harmonic and a current increment value;
the correcting the faulty node comprises:
correcting the logic of the faulty node to: when the current increment measuring element acts and is accompanied by that the second harmonic is greater than the locking setting value, after the second harmonic is locked and returned, the current increment measuring element is cleared, and the measurement is restarted when the second harmonic is lower than the locking setting value.
6. A relay protection device for a traction power supply system is characterized by comprising:
the first acquisition module is used for acquiring historical statistics values of line locomotive loads; the historical statistical value is obtained by statistics based on historical monitoring values at a plurality of different moments in the historical driving process;
the first determining module is used for determining a relay protection fixed value of the current increment based on the historical statistic value;
the constant value adjusting module is used for adjusting the relay protection set value of the current increment based on the relay protection constant value of the current increment; the adjusted relay protection setting value is larger than the relay protection setting value, and the relay protection setting value is a threshold value arranged in a relay protection device;
the device further comprises:
the second determination module is used for determining the voltage, the current, the impedance angle and the distribution state of the locomotive in the traction power supply network corresponding to the current increment protection tripping operation based on the historical statistic value;
the second acquisition module is used for acquiring historical principle logic of current increment protection;
the node identification module is used for identifying the error node of the historical principle logic based on the voltage, the current and the impedance angle corresponding to the current increment protection trip and the distribution state of the locomotive in the traction power supply network;
and the node correcting module is used for correcting the error node.
7. A computer-readable medium, characterized in that the readable medium stores a computer program for performing the steps of the method according to any of claims 1-5.
8. An electronic device, characterized in that the electronic device comprises:
a processor;
a memory for storing the processor-executable instructions;
the processor configured to read the executable instructions from the memory and execute the instructions to implement the steps of the method according to any one of claims 1 to 5.
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| CN107370114A (en) * | 2017-08-14 | 2017-11-21 | 深圳市中业智能系统控制有限公司 | The setting method and device of current quick definite value |
| CN107425510A (en) * | 2017-09-15 | 2017-12-01 | 中铁第四勘察设计院集团有限公司 | A kind of high-speed railway power supply network system and its guard method |
| CN111890994A (en) * | 2020-06-18 | 2020-11-06 | 国电南瑞南京控制系统有限公司 | High-speed railway power supply operation analysis method and system based on dynamic current acquisition |
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