CN110247365B - Method for identifying fault section of electrified railway through power supply system - Google Patents
Method for identifying fault section of electrified railway through power supply system Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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Abstract
The invention discloses a method for identifying a fault section of a through power supply system of an electrified railway, and belongs to the technical field of power supply of electrified railways. The fault section identification method specifically comprises the steps that when a bilateral power supply contact network fails and an existing protection device of a traction substation trips to remove a fault, a bilateral power supply traction network fault section identification device simultaneously sends a data reading command to each sectional acquisition device and remembers a command sending time t 1; and after receiving the data reading command, each sectional acquisition device records the current time t and uploads the effective value of the voltage and the current recorded in a time period Tm from the current time to the current time t and the phase angle difference of the voltage and the current to the identification device of the fault section of the bilateral power supply traction network. After the fault section identification device of the bilateral power supply traction network receives all the data of each sectional acquisition device, the fault section is judged by using the voltage current effective value and the phase angle difference of two cycles after the occurrence time of the sudden increase of the current effective value and the sudden decrease of the voltage effective value.
Description
Technical Field
The invention belongs to the technical field of traction power supply of alternating current electrified railways.
Background
The single-phase system has the advantages of simple structure, low construction cost, convenient application and maintenance and the like, and the common adoption of single-phase power frequency alternating current for supplying power to the railway locomotive in the electrified railway is determined. The power system hopes that all loads take three-phase symmetrical fundamental current from the power grid so as to fully utilize the capacity of equipment and lines and reduce the damage of reactive current and harmonic current to the system. In order to meet the requirement, the electrified railway adopts a scheme of phase sequence alternation and segmented split-phase power supply, every 20-25km along the railway is taken as a power supply section, each section is sequentially and respectively supplied with power by different phases in a power grid, split-phase sections of about 30m are arranged among the sections, and split phases are carried out by a split-phase device. When the locomotive loads running on the sections respectively supplied with power by each phase are the same, the three-phase load of the power system can be balanced in a large range.
However, because the traction load of each section cannot be the same at any time, the split-phase segmentation scheme only lightens the influence of three-phase unbalance to a certain extent and does not fundamentally solve the influence of single-phase power utilization of railway loads on the whole public power grid. The electric railway is forced to modify the design scheme due to the problem of influencing the quality of electric energy, the investment is increased, and the situation of passive situations sometimes happens.
Meanwhile, due to the existence of the electric phase splitting device, when the locomotive runs to the tail end of a power supply section, the locomotive must go through a series of complex operations such as grade withdrawal, power failure and the like, and then slides to the next section to restore normal operation item by item, so that the complexity of locomotive operation is increased, and the improvement of the locomotive running speed and the exertion of traction force are also severely restricted.
Therefore, an expert provides an in-phase power supply technology, an in-phase power supply device is additionally arranged in a traction substation, a left arm contact network and a right arm contact network at an outlet of the traction substation adopt the same voltage for power supply, and phase splitting at the outlet of the traction substation is cancelled. When the same-phase power supply is adopted in the whole railway line, the through same-phase power supply is realized, the whole railway line has no split phase, the high-speed advance of the train is maintained, and the transport capacity is improved. The through (bilateral) power supply can lengthen the power supply arm in places where the external power supply is weak and the traction load is not particularly large, such as a Qinghai-Tibet railway, so that the investment of the external power supply and a traction substation is greatly saved, and after the power supply arm is lengthened, the power supply arm must be segmented so that a fault section can be quickly found after a fault and isolated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for identifying a fault section of a through power supply system of an electrified railway, which can effectively solve the technical problems of identifying the fault section and isolating the fault under the conditions that a bilateral power supply contact network fails and the existing protection device of a traction substation trips to remove the fault.
The purpose of the invention adopts the following technical scheme:
a method for identifying a fault section of an electrified railway through power supply system comprises the steps that the electrified railway through power supply system comprises at least two traction substation facilities, a contact network T and a steel rail R in the section governed by the two traction substations, each traction substation is respectively connected with the contact network T and the steel rail R, and the two traction substations are marked as a traction substation SS1 and a traction substation SS2 from left to right; the overhead line system between the traction substation SS1 and the traction substation SS2 is divided into n +1 power supply sections, the two power supply sections are isolated by a sectionalizer and are sequentially marked as a section T1, a section T2, a section T3, a section …, a section Tn and a section Tn + 1; the segmenters arranged between the sections T1 and T2 are denoted as GJ1, the segmenters arranged between the sections T2 and T3 are denoted as GJ2 and …, and the segmenters arranged between the sections Tn and Tn +1 are denoted as GJn, n ≧ 2; in the power supply sections corresponding to the sectionalizers, an electric isolating switch G1, electric isolating switches G2, … and an electric isolating switch Gn are respectively connected in parallel; when the electric isolation switch G1, the electric isolation switches G2, … and the electric isolation switch Gn are normally operated, so that a through power supply system is formed; the electric isolating switch G1, the electric isolating switches G2 and … and the electric isolating switch Gn loop are respectively connected with a current transformer LH1, current transformers LH2 and … and a current transformer LHn in series; the current transformers LH1, LH2, … and LHn of each power supply section are respectively connected with a sectional acquisition device RTU1, sectional acquisition devices RTU2, … and a sectional acquisition device RTUn; the secondary side currents of all power supply sections are respectively sampled and communicated with a contact network fault section identification device D1 and a contact network fault section identification device D2 of a traction substation through power supply system through optical fiber channels; a voltage transformer YH1, voltage transformers YH2, … and a voltage transformer YHn are connected in parallel between the right arm contact net T corresponding to each sectionalizer and the steel rail R; and the data are accessed into the corresponding sectional acquisition devices RTU1, RTU2 and … and RTUn respectively; the catenary fault section recognition device D1 is connected with a position signal of a right power supply arm feeder circuit breaker DL12 of the traction substation SS1, and the catenary fault section recognition device D2 is connected with a position signal of a left power supply arm feeder circuit breaker DL21 of the traction substation SS 2; and the through power supply system contact net fault section identification device and the sectional acquisition devices respectively transmit information instructions through optical fiber channels.
A method for identifying fault sections of a through power supply system of an electrified railway comprises the steps that when a through power supply system overhead contact network fails, and a traction substation SS1 or a traction substation SS2 trips to remove faults under the condition that an existing protection device fails, a through power supply system overhead contact network fault section identification device D1 or an overhead contact network fault section identification device D2 simultaneously sends a data reading command to a subsection acquisition device of each subsection, and remembers that the command sending time t1 is sent;
after receiving the data reading command, the sectional acquisition devices of all the sections remember the current time t, and upload the voltage effective value, the current effective value and the current-voltage phase angle difference recorded in a time period Tm before the current time t to a contact network fault section recognition device which penetrates through the power supply system; the voltage effective value and the current effective value are specifically calculated once every 5ms by each sectional acquisition device, and the current-voltage phase angle difference is equal to the difference obtained by subtracting the voltage phase angle from the calculated current phase angle; after the through power supply system contact network fault section recognition device D1 or the contact network fault section recognition device D2 receives all the data of the section acquisition devices of each section, the section with the fault is judged by the voltage effective value, the current effective value and the current voltage phase angle difference of two cycles after the occurrence time of the current effective value sudden increase and the voltage effective value sudden decrease:
(1) the phase angle difference judgment method comprises the steps that voltage and current phase angle difference signs measured by the segmented acquisition devices at two ends of a section with a fault are opposite, when the fault occurs in the section T2, the phase angle difference signs measured by the segmented acquisition devices RTU1 at two ends of the section T2 and the segmented acquisition device RTU2 are opposite, and the phase angle difference signs measured by the segmented acquisition devices RTUS1 are the same as the phase angle difference signs measured by the segmented acquisition devices RTU 1; the phase angle difference signs measured by the sectional acquisition devices RTU3 and …, the sectional acquisition device RTUn and the sectional acquisition device RTUS2 are the same as the sectional acquisition device RTU 2;
(2) voltage effective value discrimination: under most conditions, the effective values of the voltages measured by the sectional acquisition devices at the two ends of the section with the fault are the two smallest in all the measured voltages, and when the fault occurs in the section T2, the effective value of the current measured by the sectional acquisition device RTUS1 of the section T2 is larger than the effective value of the voltage measured by the sectional acquisition device RTU 1; the voltage effective value measured by the sectional acquisition device RTUS2 is greater than the voltage effective value measured by the sectional acquisition device RTUn, the voltage effective value measured by the sectional acquisition device RTUn is greater than the voltage effective value measured by the sectional acquisition device RTUn-1, …, and the voltage effective value measured by the sectional acquisition device RTU3 is greater than the voltage effective value measured by the sectional acquisition device RTU 2;
(3) current effective value discrimination: under most conditions, the effective values of currents measured by the sectional acquisition devices at two ends of a section with a fault are different, when the fault occurs in a section T2, the effective values of the currents measured by the sectional acquisition device RTU1 of the section T2 and the sectional acquisition device RTU2 are different, and the effective value of the current measured by the sectional acquisition device RTUS1 is the same as that of the sectional acquisition device RTU 1; the effective values of the currents measured by the sectional acquisition devices RTU3 and …, the sectional acquisition device RTUn and the sectional acquisition device RTUS2 are the same as the effective values of the currents measured by the sectional acquisition device RTU 2;
(4) the results of the above (1), (2) and (3) are verified mutually, if the results are the same, the reliability is high; and (3) if the results can not be judged in both (2) and (3), the result in (1) is taken as a conclusion.
Preferably, the time period Tm is in particular [ t-t ]P,t]Second, wherein t is the moment when the sectional acquisition device receives the signal of the contact network fault section identification device, tPAnd the longest action time is provided for power supply arm relay protection.
Preferably, the time t1 is a disconnection time of the corresponding substation feeder circuit breaker detected by the through power supply system catenary fault section recognition device D1 or the catenary fault section recognition device D2, the catenary fault section recognition device D1 detects a disconnection time of the circuit breaker DL12, and the catenary fault section recognition device D2 detects a disconnection time of the circuit breaker DL 21. Further preferably, the method for identifying the fault section of the bilateral power supply traction network is characterized in that the effective voltage and current values and the phase angle difference of the voltage and the current are obtained by calculating the effective voltage and current values and the phase angle of each segmented acquisition device every 5ms (1/4 cycles), and the phase angle difference of the voltage and the current is equal to the difference obtained by subtracting the voltage phase angle from the calculated current phase angle.
Compared with the prior art, the invention has the beneficial effects that:
the method collects the current and the current of the voltage transformer arranged at the section of the contact network to identify and locate the fault section of the contact network, quickly isolates the fault, avoids the expansion of the fault influence and further improves the reliability of power supply of the traction network.
And secondly, the invention synchronizes the data of each acquisition device by identifying the voltage sudden drop and the current sudden increase positions, and has the advantages of simplicity, reliability and strong operability.
The method is suitable for single-line direct supply or AT electrified railways, compound-line direct supply or AT electrified railways.
Drawings
Fig. 1 is a schematic diagram of a basic flow according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a system according to a second embodiment of the present invention.
Detailed Description
The working principle of the invention is as follows: under the condition that a bilateral power supply contact network fails and an existing protection device of a traction substation trips to remove the fault, a fault section identification device of the bilateral power supply traction network simultaneously sends a data reading command to each sectional acquisition device and remembers a command sending time t 1; and after receiving the data reading command, each sectional acquisition device records the current time t and uploads the effective value of the voltage and the current recorded in a time period Tm from the current time to the current time t and the phase angle difference of the voltage and the current to the identification device of the fault section of the bilateral power supply traction network. After the fault section identification device of the bilateral power supply traction network receives all the data of each sectional acquisition device, the fault section is judged by using the voltage current effective value and the phase angle difference of two cycles after the occurrence time of the sudden increase of the current effective value and the sudden decrease of the voltage effective value.
Example one
As shown in fig. 1, an embodiment of the present invention provides a method for identifying a fault section of a through power supply system of an electrified railway, where when a contact network of the through power supply system fails and a traction substation SS1 or a traction substation SS2 trips to remove the fault, a contact network fault section identification device D1 or a contact network fault section identification device D2 of the through power supply system simultaneously sends a data reading command to a section acquisition device of each section, and remembers a command sending time t 1; and after receiving the data reading command, the sectional acquisition devices of the sections remember the current time t, and upload the effective value of the voltage and the current recorded in a time period Tm before the current time t and the voltage angle difference to a contact network fault section recognition device penetrating through the power supply system. After the through power supply system contact network fault section recognition device D1 or the contact network fault section recognition device D2 receives all the data of the subsection acquisition devices of each subsection, the section with the fault is judged by the voltage and current effective values and the phase angle difference of two cycles after the occurrence time of the sudden increase of the current effective value and the sudden decrease of the voltage effective value:
(1) the phase angle difference judgment method comprises the steps that voltage and current phase angle difference signs measured by the segmented acquisition devices at two ends of a section with a fault are opposite, when the fault occurs in the section T2, the phase angle difference signs measured by the segmented acquisition devices RTU1 at two ends of the section T2 and the segmented acquisition device RTU2 are opposite, and the phase angle difference signs measured by the segmented acquisition devices RTUS1 are the same as the phase angle difference signs measured by the segmented acquisition devices RTU 1; the phase angle difference signs measured by the sectional acquisition devices RTU3 and …, the sectional acquisition device RTUn and the sectional acquisition device RTUS2 are the same as the sectional acquisition device RTU 2;
(2) voltage effective value discrimination: under most conditions, the effective values of the voltages measured by the sectional acquisition devices at the two ends of the section with the fault are the two smallest in all the measured voltages, and when the fault occurs in the section T2, the effective value of the current measured by the sectional acquisition device RTUS1 of the section T2 is larger than the effective value of the voltage measured by the sectional acquisition device RTU 1; the effective voltage value measured by the sectional acquisition device RTUS2 is greater than the effective voltage value measured by the sectional acquisition device RTUn, the effective voltage value measured by the sectional acquisition device RTUn is greater than the effective voltage value measured by the sectional acquisition device RTUn-1, …, and the effective voltage value measured by the sectional acquisition device RTU3 is greater than the effective voltage value measured by the sectional acquisition device RTU 2.
(3) Current effective value discrimination: under most conditions, the effective values of currents measured by the sectional acquisition devices at two ends of a section with a fault are different, when the fault occurs in a section T2, the effective values of the currents measured by the sectional acquisition device RTU1 of the section T2 and the sectional acquisition device RTU2 are different, and the effective value of the current measured by the sectional acquisition device RTUS1 is the same as that of the sectional acquisition device RTU 1; the effective values of the currents measured by the sectional acquisition devices RTU3 and …, the sectional acquisition device RTUn and the sectional acquisition device RTUS2 are the same as the effective values of the currents measured by the sectional acquisition device RTU 2;
(4) the results of the above (1), (2) and (3) are verified mutually, if the results are the same, the reliability is high; and (3) if the results can not be judged in both (2) and (3), the result in (1) is taken as a conclusion.
In the embodiment of the invention, the time period Tm is specifically [ t-tP,t]Second, where t is the time when the sectional acquisition device receives the signal of the fault section identification device, tPAnd the longest action time is provided for power supply arm relay protection. The time t1 is specifically the disconnection time of the feeder circuit breaker of the corresponding substation detected by the identification device of the fault section of the bilateral power supply traction network, the disconnection time of the circuit breaker DL12 detected by D1, and the disconnection time of the circuit breaker DL21 detected by D2.
The voltage and current effective value and the voltage and current phase angle difference are specifically that each sectional acquisition device calculates the voltage and current effective value and the phase angle every 5ms (1/4 cycles), and the voltage and current phase angle difference is equal to the difference obtained by subtracting the voltage phase angle from the calculated current phase angle.
Therefore, the current transformer current arranged at the contact network subsection is collected to identify the contact network fault section, so that the fault is quickly isolated, the fault influence is prevented from being expanded, and the reliability of power supply of the traction network is further improved. The data of each acquisition device is synchronized by identifying the positions of the sudden increase of the current and the sudden decrease of the voltage, so that the method is simple, reliable and strong in operability. The method is suitable for single-line direct supply or AT electrified railways, compound-line direct supply or AT electrified railways.
Example two
As shown in fig. 2, the electrified railway through power supply system shown in the embodiment of the present invention includes at least two traction substations, and a catenary T and a rail R in the jurisdiction of the two traction substations, each traction substation is respectively connected to the catenary T and the rail R, and the two traction substations are marked as a traction substation SS1 and a traction substation SS2 from left to right; the overhead line system between the traction substation SS1 and the traction substation SS2 is divided into n +1 power supply sections, the two power supply sections are isolated by a sectionalizer and are sequentially marked as a section T1, a section T2, a section T3, a section …, a section Tn and a section Tn + 1; the segmenters arranged between the sections T1 and T2 are denoted as GJ1, the segmenters arranged between the sections T2 and T3 are denoted as GJ2 and …, and the segmenters arranged between the sections Tn and Tn +1 are denoted as GJn, n ≧ 2; in the power supply sections corresponding to the sectionalizers, an electric isolating switch G1, electric isolating switches G2, … and an electric isolating switch Gn are respectively connected in parallel; when the electric isolation switch G1, the electric isolation switches G2, … and the electric isolation switch Gn are normally operated, so that a through power supply system is formed; the method is characterized in that: the electric isolating switch G1, the electric isolating switches G2 and … and the electric isolating switch Gn loop are respectively connected with a current transformer LH1, current transformers LH2 and … and a current transformer LHn in series; the current transformers LH1, LH2, … and LHn of each power supply section are respectively connected with a sectional acquisition device RTU1, sectional acquisition devices RTU2, … and a sectional acquisition device RTUn; the secondary side currents of all power supply sections are respectively sampled and communicated with a contact network fault section identification device D1 and a contact network fault section identification device D2 of a traction substation through power supply system through optical fiber channels; a voltage transformer YH1, voltage transformers YH2, … and a voltage transformer YHn are connected in parallel between the right arm contact net T corresponding to each sectionalizer and the steel rail R; and the data are accessed into the corresponding sectional acquisition devices RTU1, RTU2 and … and RTUn respectively; the catenary fault section recognition device D1 is connected with a position signal of a right power supply arm feeder circuit breaker DL12 of the traction substation SS1, and the catenary fault section recognition device D2 is connected with a position signal of a left power supply arm feeder circuit breaker DL21 of the traction substation SS 2; and the through power supply system contact net fault section identification device and the sectional acquisition devices respectively transmit information instructions through optical fiber channels. Therefore, the electrified railway through (bilateral) power supply system provided by the embodiment of the invention identifies the fault section of the contact network by collecting the current of the current transformer arranged at the subsection of the contact network, quickly isolates the fault, avoids the expansion of the fault influence and further improves the reliability of the power supply of the traction network. The data of each acquisition device is synchronized by identifying the positions of the sudden increase of the current and the sudden decrease of the voltage, so that the method is simple, reliable and strong in operability. The method is suitable for single-line direct supply or AT electrified railways, compound-line direct supply or AT electrified railways.
Claims (3)
1. A fault section identification method for an electrified railway through power supply system comprises the steps that the electrified railway through power supply system comprises at least two traction substation facilities, a contact network T and a steel rail R in the section governed by the two traction substations, each traction substation is respectively connected with the contact network T and the steel rail R, the two traction substations are marked as a traction substation SS1 and a traction substation SS2 from left to right; the overhead line system between the traction substation SS1 and the traction substation SS2 is divided into n +1 power supply sections, the two power supply sections are isolated by a sectionalizer and are sequentially marked as a section T1, a section T2, a section T3, a section …, a section Tn and a section Tn + 1; the segmenters arranged between the sections T1 and T2 are denoted as GJ1, the segmenters arranged between the sections T2 and T3 are denoted as GJ2 and …, and the segmenters arranged between the sections Tn and Tn +1 are denoted as GJn, n ≧ 2; in the power supply sections corresponding to the sectionalizers, an electric isolating switch G1, electric isolating switches G2, … and an electric isolating switch Gn are respectively connected in parallel; when the electric isolation switch G1, the electric isolation switches G2, … and the electric isolation switch Gn are normally operated, so that a through power supply system is formed; the method is characterized in that: the electric isolating switch G1, the electric isolating switches G2 and … and the electric isolating switch Gn loop are respectively connected with a current transformer LH1, current transformers LH2 and … and a current transformer LHn in series; the current transformers LH1, LH2, … and LHn of each power supply section are respectively connected with a sectional acquisition device RTU1, sectional acquisition devices RTU2, … and a sectional acquisition device RTUn; the secondary side currents of all power supply sections are respectively sampled and communicated with a contact network fault section identification device D1 and a contact network fault section identification device D2 of a traction substation through power supply system through optical fiber channels; a voltage transformer YH1, voltage transformers YH2, … and a voltage transformer YHn are connected in parallel between the right arm contact net T corresponding to each sectionalizer and the steel rail R; and the data are accessed into the corresponding sectional acquisition devices RTU1, RTU2 and … and RTUn respectively; the catenary fault section recognition device D1 is connected with a position signal of a right power supply arm feeder circuit breaker DL12 of the traction substation SS1, and the catenary fault section recognition device D2 is connected with a position signal of a left power supply arm feeder circuit breaker DL21 of the traction substation SS 2; the identification device for the fault section of the contact network of each through power supply system and each sectional acquisition device respectively transmit information instructions through an optical fiber channel; when a through power supply system contact network fails, and a traction substation SS1 or a traction substation SS2 trips to remove a fault under the condition that an existing protection device fails, a contact network fault section recognition device D1 or a contact network fault section recognition device D2 of the through power supply system simultaneously sends a data reading command to a subsection acquisition device of each subsection, and remembers a command sending time t 1; after receiving the data reading command, the sectional acquisition devices of all the sections remember the current time t, and upload the voltage effective value, the current effective value and the current-voltage phase angle difference recorded in a time period Tm before the current time t to a contact network fault section recognition device which penetrates through the power supply system; the voltage effective value and the current effective value are specifically calculated once every 5ms by each sectional acquisition device, and the current-voltage phase angle difference is equal to the difference obtained by subtracting the voltage phase angle from the calculated current phase angle; after the through power supply system contact network fault section recognition device D1 or the contact network fault section recognition device D2 receives all the data of the section acquisition devices of each section, the section with the fault is judged by the voltage effective value, the current effective value and the current voltage phase angle difference of two cycles after the occurrence time of the current effective value sudden increase and the voltage effective value sudden decrease:
(1) the phase angle difference judgment method comprises the steps that the signs of current and voltage phase angle differences measured by the segmented acquisition devices at the two ends of a section with a fault are opposite, and when the fault occurs in the section T2, the signs of the phase angle differences measured by the segmented acquisition devices RTU1 at the two ends of the section T2 and the signs of the phase angle differences measured by the segmented acquisition devices RTU2 are opposite; the phase angle difference signs measured by the sectional acquisition devices RTU3 and … and the sectional acquisition device RTUn are the same as the sectional acquisition device RTU 2;
(2) voltage effective value discrimination: the effective values of the voltages measured by the sectional acquisition devices at two ends of the section with the fault are the minimum two of all the measured voltages, when the fault occurs in the section T2, the effective value of the voltage measured by the sectional acquisition device RTUn is greater than the effective value of the voltage measured by the sectional acquisition device RTUn-1, …, and the effective value of the voltage measured by the sectional acquisition device RTU3 is greater than the effective value of the voltage measured by the sectional acquisition device RTU 2;
(3) current effective value discrimination: the effective values of the currents measured by the sectional acquisition devices at two ends of the section with the fault are different, when the fault occurs in the section T2, the effective values of the currents measured by the sectional acquisition device RTU1 of the section T2 and the sectional acquisition device RTU2 are different, and the effective values of the currents measured by the sectional acquisition devices RTU3 and … and the sectional acquisition device RTUn are the same as the effective value of the current measured by the sectional acquisition device RTU 2;
(4) the results of the above (1), (2) and (3) are verified mutually, if the results are the same, the reliability is high; and (3) if the results can not be judged in both (2) and (3), the result in (1) is taken as a conclusion.
2. The method for identifying the fault section of the electrified railway run-through power supply system according to claim 1, wherein the method comprises the following steps: the time period Tm is specifically [ t-tP,t]Second, wherein t is the moment when the sectional acquisition device receives the signal of the contact network fault section identification device, tPAnd the longest action time is provided for power supply arm relay protection.
3. The method for identifying the fault section of the electrified railway run-through power supply system according to claim 1, wherein the method comprises the following steps: the time t1 is specifically the disconnection time of the corresponding substation feeder circuit breaker detected by the through power supply system catenary fault section recognition device D1 or the catenary fault section recognition device D2, the catenary fault section recognition device D1 detects the disconnection time of the circuit breaker DL12, and the catenary fault section recognition device D2 detects the disconnection time of the circuit breaker DL 21.
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| CN110979105B (en) * | 2019-12-24 | 2022-06-14 | 中铁二院工程集团有限责任公司 | Design method for external power supply access scheme of through bilateral traction power supply system |
| CN114094547B (en) * | 2021-10-27 | 2023-09-08 | 南京南瑞继保电气有限公司 | Protection method and protection device for compound line direct-supply traction network |
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