CN112332382A - Relay protection method and system based on flexible traction network - Google Patents
Relay protection method and system based on flexible traction network Download PDFInfo
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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
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
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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
- H02H7/267—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 parallel lines and wires
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Abstract
The invention provides a relay protection method and system based on a flexible traction network, which are used for solving the problems of incomplete, unreliable and insensitive relay protection of the flexible traction network. The relay protection method includes configuring protection devices for a substation and a subarea station and building a local area network, collecting bus voltage of the substation and adjacent substations, current and position states of switches by the substation protection devices and judging an operation mode, selecting incoming line switch current as a reference current direction when the bus voltage is smaller than a preset threshold, calculating current directions of other switches through a current relative phase ratio, and comparing the current directions with current directions in a truth table; when consistent with the truth table, the fault location is determined and the corresponding switch is tripped. The invention can rapidly and accurately remove fault points, reduce the power failure time, narrow the power failure range and improve the safety and reliability of the traction network; meanwhile, all the operation modes can be self-adapted, the fixed value does not need to be adjusted manually, manual errors in the process of adjusting the fixed value can be avoided, and potential safety hazards are reduced.
Description
Technical Field
The invention belongs to the field of railway electric power safety, and particularly relates to a relay protection method and a relay protection system based on a flexible traction network.
Background
The normal operation of a railway train requires the traction network to provide power. Fig. 1 is a schematic view showing a conventional railway traction net structure in the prior art. As shown in fig. 1. Because the voltage phases of the traction networks in all sections are different, an electric phase separation is required to be arranged on the traction network where the substation and the subarea are located, and when the traction network is in normal operation, the bus tie switch of the substation and the subarea must be opened, and the traction networks on two sides operate independently by taking the tie switch as a boundary. The traction network protection configuration in the operation mode is shown in table 1, the protection configuration and the matching are simple, but the problem that the power loss and speed reduction are easy to occur and the inter-phase short circuit is easy to occur when a train passes through the traction network electric phase separation due to the fact that the electric phase separation has a dead zone.
TABLE 1 Single-supply traction network protection configuration table
| Switch | Protection arrangement | ||
| 1，2，11，12 | Differential protection of transformer, low-voltage starting |
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| 3，4，15，16 | Distance protection, low voltage start over |
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| 5，6，13，14 | Two-stage distance protection, low-voltage starting overcurrent protection | ||
| 7，8，9，10 | Distance protection, low voltage start over current protection |
In order to improve the railway operation efficiency and safety, a flexible power supply traction network appears, and fig. 2 is a schematic structural diagram of a flexible traction network in the prior art. As shown in fig. 2, the phases of the power supplies provided by the two power transformers are the same, and when the train runs normally, each bus tie switch is closed, and the traction network is not provided with a dead zone, so that the train can run in the whole process without power loss and interphase short circuit. The flexible traction network structure supports expanding the number of substations and bays. The relay protection of the flexible traction network is the guarantee of the safe operation of the train.
In the prior art, the applicable relay protection configuration is shown in table 2.
TABLE 2 Flexible traction network protection configuration table
| Switch | Protection arrangement | ||
| 1，2，11，12 | Differential protection of transformer, low-voltage starting |
||
| 3，4，15，16 | Distance protection, low voltage start over |
||
| 5，6，13，14 | Longitudinal differential protection, two-stage distance protection, low-voltage starting overcurrent protection | ||
| 7，8，9，10 | Longitudinal differential protection, distance protection, low voltage start over current protection |
Wherein:
(1) the longitudinal differential protection is arranged in pairs, 5 and 8, 6 and 7, 9 and 14, and 10 and 13 respectively.
(2)5, 6, 13, 14, the protection range of the first distance protection is 85% of the distance from the power substation to the subarea substation, and the protection range of the second distance protection is the full range between the two power substations.
The relay protection of the conventional flexible traction network shown in table 2 has the following problems:
(1) the longitudinal differential protection only protects the range between the current transformers on two sides and does not protect the range (such as a bus) outside the current transformers, and the protection range is not full.
(2) Differential current caused by current taking of a normally running train needs to be avoided during longitudinal differential protection setting, so that the longitudinal differential protection setting value is large, and the protection sensitivity is insufficient.
(3) After short circuit, the voltage of the bus is very low, and for the distance protection of the subareas, the impedance angle cannot be accurately calculated in a large range, so that the protection of 4 feeders of the subareas acts simultaneously, and the protection selectivity is lost.
(4) In most fault conditions, 4 feeders of the subarea have fault currents, so that the low voltage of the 4 feeders starts over-current protection to act simultaneously, and selectivity is not available.
(5) Both distance protection and low-voltage starting overcurrent protection need to utilize bus voltage, when PT disconnection occurs, the distance protection can be in misoperation or locked, the overcurrent protection can be in misoperation due to large load current, the two types of protection are not completely reliable, and the distance protection or the overcurrent protection is possibly invalid.
(6) Different setting values are set for different operation modes (power supply device failure and power supply support) of the traction network, distance protection and low-voltage starting overcurrent protection, and the adjustment of the setting values needs manual adjustment when the operation modes are switched, so that the operation is inconvenient.
Disclosure of Invention
In order to improve the reliability, stability and sensitivity of the relay protection of the flexible traction network, the embodiment of the invention provides a method and a system for the relay protection of the flexible traction network based on the relative current phase ratio.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, an embodiment of the present invention provides a relay protection method based on a flexible traction network, where the relay protection method of the flexible traction network includes the following steps:
step S1, configuring protection devices for substations and partitions in the flexible traction network, and building a local area network between the protection devices;
step S2, collecting the bus voltage of the local station and the adjacent station, the current and the position state of each switch by the protection device of each substation;
step S3, the protection device judges the current operation mode of the flexible traction network according to the switch position state, and calls a group of current direction truth tables under the current operation mode according to the operation mode;
step S4, under the current operation mode, monitoring the bus voltage, and when the bus voltage is smaller than a preset threshold value, entering the step S5; when the bus voltage is greater than or equal to the preset threshold value, repeating the step S4, and continuously monitoring the bus voltage;
step S5, selecting the current of the incoming line switch in the current operation mode as a reference current direction, and calculating the current direction of each switch through the relative phase ratio of the current;
step S6, comparing the current direction of the ith switch with the current direction of the ith switch at the jth fault location in the truth table in sequence: when the current directions are inconsistent, executing j to j +1, and repeating the step S6; when each current direction is consistent, the process proceeds to step S7;
and step S7, protecting the exit and outputting a switch number corresponding to the jth fault position.
In a preferred embodiment of the present invention, at least one protection device is disposed in the substation or the partition in step S1.
As a preferred embodiment of the invention, the local area network is built, and the SV/GOOSE network is built based on IEC 61850.
As a preferred embodiment of the invention, said relative current ratio is a method of phase-comparing the current at each switch with a reference current, the result being a relative current direction between the two switches.
As a preferred embodiment of the present invention, the relative current direction judgment is based on that the current always flows from the high potential point to the low potential point.
As a preferred embodiment of the present invention, the initial values of i and j are 1.
In a second aspect, an embodiment of the present invention further provides a relay protection system based on a flexible traction network, where the system includes the flexible traction network, an internal substation, and a substation, the system further includes protection devices and a local area network built between the protection devices, and the protection devices are configured in the substation and the substation.
As a preferred embodiment of the present invention, the protection device includes: the device comprises a data acquisition module, an operation mode judgment module, a bus voltage monitoring module, a current relative phase comparison calculation module, a current direction comparison module and a result output module; wherein,
the data acquisition module is used for acquiring the bus voltage of the local and adjacent places where the protection device is located, and the current and position state of each switch;
the operation mode judging module is used for judging the operation mode of the current flexible traction network according to the switch position state and sending the operation mode to the bus voltage monitoring module; the current direction comparison module is also used for calling a current direction truth table in the current operation mode according to the operation mode and sending the truth table to the current direction comparison module;
the bus voltage monitoring module is used for monitoring the bus voltage in the current operation mode, and starting the current relative phase ratio calculation module when the bus voltage is smaller than a preset threshold value; when the bus voltage is greater than or equal to a preset threshold value, continuously monitoring the bus voltage;
the current relative phase comparison calculation module is used for selecting the current of the incoming line switch in the current operation mode as a reference current direction, calculating the current relative direction of each of the other switches and simultaneously sending the current relative direction to the current direction comparison module;
the current direction comparison module is used for comparing the current direction of the ith switch with the current direction of the ith switch at the jth fault position in the truth table: when the current directions are inconsistent, executing j to j +1, and continuing comparison operation; and when each current direction is consistent, judging that the truth table is suitable for the current fault, and sending the result to the result output module.
And the result output module is used for outputting the switch number which needs to be tripped when the current fault occurs.
The embodiment of the invention has the following beneficial effects:
(1) the protection range is comprehensive. The relay protection method can not only identify short-circuit faults on a contact network, but also identify short-circuit faults on buses of each substation and each subarea station, so that full-range protection of the traction network is formed, and no protection dead zone exists.
(2) The protection selectivity is good. The relay protection method can distinguish fault points from the contact network uplink and downlink or substation buses and the subarea substation buses, has definite judgment positions, clear trip range, can not enlarge the trip range, and has complete protection selectivity.
(3) The protection is fast and convenient. The relay protection method can identify the fault point within 0.1 second, time limit coordination among all the protections is not needed, and compared with the protection functions of distance protection, over-current protection and the like which need time limit coordination, the protection quick-action performance is better.
(4) Is convenient to use. The relay protection method can automatically identify the operation mode according to each switch position, automatically adapt to the truth table, and is convenient to use because the fixed value does not need to be adjusted when the operation mode is switched.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional railway traction network configuration of the prior art;
FIG. 2 is a schematic diagram of a prior art railway flexible traction network;
FIG. 3 is a schematic diagram of a fault location of an embodiment of the present invention;
fig. 4 is a schematic flow chart of a relay protection method based on a flexible traction network according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a current relative phase ratio calculation principle of the relay protection method according to the embodiment of the invention;
FIG. 6 is a diagram of the hardware connections of protection devices configured for substation 1, substation 2 and bays in an example of the present invention;
fig. 7 is a first exemplary diagram of a lan structure built by the protection devices in the substation 1, the substation 2 and the substations in fig. 6;
fig. 8 is a second exemplary diagram of a lan structure built by the protection devices in the substation 1, the substation 2, and the bays in fig. 6.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a relay protection method of a flexible traction network according to the characteristics of the flexible traction network, which automatically identifies the current operation mode of the traction network by judging the switch position states of a plurality of substations; then, identifying a normal state and a fault state by judging the voltage drop; and finally, judging the position of a fault point by current relative phase comparison to obtain relay protection with perfection, selectivity and rapidity, ensuring the reliability, stability and flexibility of the flexible traction network and ensuring the safe and stable operation of the railway train.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
First embodiment
The embodiment provides a relay protection method based on a flexible traction network, and as shown in fig. 4, the relay protection method of the flexible traction network includes the following steps:
step S1, configuring protection devices for substations and partitions in the flexible traction network, and building a local area network between the protection devices;
step S2, the protection devices of each substation and each subarea station collect the 27.5kV bus voltage of the local station and the adjacent stations, the current and the position state of each switch;
step S3, the protection device judges the current operation mode of the flexible traction network according to the switch position state, and calls a group of current direction truth tables under the current operation mode according to the operation mode;
step S4, under the current operation mode, monitoring the bus voltage, and when the bus voltage is smaller than a preset threshold value, entering the step S5; when the bus voltage is greater than or equal to the preset threshold value, repeating the step S4, and continuously monitoring the bus voltage;
step S5, selecting the current of the incoming line switch in the current operation mode as a reference current direction, and calculating the current direction of each switch through the relative phase ratio of the current;
step S6, comparing the current direction of the ith switch with the current direction of the ith switch at the jth fault location in the truth table in sequence: when the current directions are inconsistent, executing j to j +1, and repeating the step S6; when each current direction is consistent, the process proceeds to step S7;
step S7, protecting the outlet, and outputting the switch number corresponding to the jth fault location in the above embodiment, the steps S1 and S2 are hardware building and data initialization stages.
The flexible traction net in step S1 may be a full net or a partial net. The number of the involved substations and subareas can be increased or decreased according to actual needs. At least one protection device is configured for the substation and the subarea station, and two or more protection devices can be configured according to the actual needs and the scales of the substation and the subarea station. The local area network can be built in a point-to-point networking mode, a ring networking mode or a switch networking mode.
In step S2, bus voltage, current and position information at the switch are collected, and a truth table of current direction is constructed.
In step S3, the identification of the operation mode of the traction network is determined by the protection device according to the switch position state, which is an automatic identification process. The operation modes of the flexible traction network comprise a normal operation mode, a zone bus handover operation mode, a contact network switch handover operation mode and the like. Each operating mode corresponds to a different current relative ratio truth table.
In step S5, the current of the incoming line switch is selected as the reference current, and consideration and calculation of the voltage are not included. The traction network has the characteristics of multiple power supplies, low-voltage starting overcurrent protection without direction judgment cannot distinguish which direction power supply the fault current is provided by, selectivity is not available, the traction network is not suitable for a multi-power supply system, and the problem that the direction cannot be accurately calculated due to too low bus voltage exists at the same time. In the present embodiment, only the relative direction of the current is used as the protection criterion.
The current relative phase ratio is a method of phase-comparing the current at each switch with a reference current, resulting in a relative current direction between the two switches. The relative current direction determination is based on a basic principle: outside the power supply, current always flows from the high potential point to the low potential point. Fig. 5 is a schematic diagram illustrating the principle of calculating the relative ratio of current in this embodiment. As shown in fig. 5, when a short circuit at point G occurs, so as to
Is a reference direction, by ohm's law
The relative current direction at each switch can be derived as indicated by the arrows in figure 5.
In this embodiment, the relative direction of the current is used as a protection criterion, and the method is suitable for a single-power traction network and a flexible traction network, including a long-distance traction network formed by a plurality of substations and partitions, and also can be used for a whole flexible traction network. The relative current phase ratio is based on the selected incoming line switch current, and the respective current at each switch is fully considered in the calculation, and except the switch providing the reference current, the other switches are not affected mutually, so that the fault operation mode can be automatically adapted according to the switch position.
In the above embodiment, the calculated relative direction of the current at each switch and the current direction values in the truth table are compared one by one in steps S6 and S7, and finally the position of the fault is determined.
Second embodiment
The embodiment provides a relay protection system based on a flexible traction network, and the system comprises the flexible traction network, an internal power substation, a regional substation, a protection device and a local area network built between the protection devices.
The protection device is disposed in the substation and the sub-district, and includes: the device comprises a data acquisition module, an operation mode judgment module, a bus voltage monitoring module, a current relative phase comparison calculation module, a current direction comparison module and a result output module; wherein,
the data acquisition module is used for acquiring the bus voltage of the local and adjacent places where the protection device is located, and the current and position state of each switch;
the operation mode judging module is used for judging the operation mode of the current flexible traction network according to the switch position state and sending the operation mode to the bus voltage monitoring module; the current direction comparison module is also used for calling a current direction truth table in the current operation mode according to the operation mode and sending the truth table to the current direction comparison module;
the bus voltage monitoring module is used for monitoring the bus voltage in the current operation mode, and starting the current relative phase ratio calculation module when the bus voltage is smaller than a preset threshold value; when the bus voltage is greater than or equal to a preset threshold value, continuously monitoring the bus voltage;
the current relative phase comparison calculation module is used for selecting the current of the incoming line switch in the current operation mode as a reference current direction, calculating the current relative direction of each of the other switches and simultaneously sending the current relative direction to the current direction comparison module;
the current direction comparison module is used for comparing the current direction of the ith switch with the current direction of the ith switch at the jth fault position in the truth table: when the current directions are inconsistent, executing j to j +1, and continuing comparison operation; and when each current direction is consistent, judging that the truth table is suitable for the current fault, and sending the result to the result output module.
And the result output module is used for outputting the switch number which needs to be tripped when the current fault occurs.
The relay protection system based on the flexible traction network in this embodiment corresponds to the relay protection method based on the flexible traction network in the first embodiment, the method is implemented based on the system, and the description of the method in the first embodiment is also applicable to the system in this embodiment, and is not repeated here.
The present invention will be described in detail below by taking the substation 1, the substation 2 and the zoning station as examples.
Fig. 6 is a diagram showing the hardware connection of protection devices arranged in the substation 1, the substation 2, and the bays. The data collected by the data collection module of the protection device comprises data of the local place and the neighboring places. Such as a protection device in a substation 1, collects data in the local substation and simultaneously collects data of a neighboring substation 2 and a subarea substation.
Fig. 7 shows a first example of a lan structure constructed by the protection devices in the substation 1, the substation 2, and the bays. As shown in fig. 7, the constructed lan is a ring network. Fig. 8 shows a second example of a lan structure constructed by the protection devices in the substation 1, the substation 2, and the bays. As shown in fig. 8, the constructed local area network is networked through switches.
Taking a to K fault locations in the substation 1, the substation 2, and the bays as an example, a truth table is constructed as shown in table 3. (in the table, i is 1-16, j is A-K. for convenience of description, the j is a letter instead of a number.) the fault locations A-K are shown in FIG. 3.
TABLE 3
In the network built by the substation 1, the substation 2 and the bays, steps S3 to S7 are performed, and the result is also shown in table 3 by comparing the calculated relative phase of the currents at the switches with the data in the truth table. Through the truth table shown in table 3, the relative phase comparison result of the currents of the comprehensive substation 1 and the subareas can clearly judge the positions of the A-K fault points and drive the corresponding switches to trip.
For example, when a downstream catenary between the substation 1 and the substation fails, there is a fault point in the upstream catenary, so that the current at the circuit breakers 6 and 7 is zero. Comparing the current directions of the switches in the row A in sequence, and executing j to j +1 when the current directions are inconsistent when i to 6; comparing the current directions of the switches in the B row in sequence; and repeating the comparison and line feed operations until the line E is reached, wherein each current direction is consistent, the fault point is marked as E, and outputting 'protective action switches 6 and 7' (the switches 6 and 7 are tripped).
According to the technical scheme, the relay protection method and the relay protection system based on the flexible traction network can quickly and accurately remove fault points, reduce power failure time, narrow power failure range and improve the safety and reliability of the traction network; meanwhile, all operation modes can be self-adapted, the fixed value does not need to be adjusted manually, the working efficiency is improved, manual errors in the process of adjusting the fixed value can be avoided, and potential safety hazards are reduced.
The present invention has been described in detail with reference to the embodiments, but the description is only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The scope of the invention is defined by the claims. The technical solutions of the present invention or those skilled in the art, based on the teaching of the technical solutions of the present invention, should be considered to be within the scope of the present invention, and all equivalent changes and modifications made within the scope of the present invention or equivalent technical solutions designed to achieve the above technical effects are also within the scope of the present invention. It should be noted that for the sake of clarity, parts of the description of the invention have been omitted where there is no direct explicit connection with the scope of protection of the invention, but where components and processes are known to those skilled in the art.
Claims (10)
1. A relay protection method based on a flexible traction network is characterized by comprising the following steps:
step S1, configuring protection devices for substations and partitions in the flexible traction network, and building a local area network between the protection devices;
step S2, collecting the bus voltage of the local station and the adjacent station, the current and the position state of each switch by the protection device of each substation;
step S3, the protection device judges the current operation mode of the flexible traction network according to the switch position state, and calls a group of current direction truth tables under the current operation mode according to the operation mode;
step S4, under the current operation mode, monitoring the bus voltage, and when the bus voltage is smaller than a preset threshold value, entering the step S5; when the bus voltage is greater than or equal to the preset threshold value, repeating the step S4, and continuously monitoring the bus voltage;
step S5, selecting the current of the incoming line switch in the current operation mode as a reference current direction, and calculating the current direction of each switch through the relative phase ratio of the current;
step S6, comparing the current direction of the ith switch with the current direction of the ith switch at the jth fault location in the truth table in sequence: when the current directions are inconsistent, executing j to j +1, and repeating the step S6; when each current direction is consistent, the process proceeds to step S7;
and step S7, protecting the exit and outputting a switch number corresponding to the jth fault position.
2. The relay protection method based on the flexible traction network according to claim 1, wherein at least one protection device is configured in the substation and the subarea in step S1.
3. The relay protection method based on the flexible traction network according to claim 1, wherein the local area network is built, and the SV/GOOSE network is built based on IEC 61850.
4. The method of claim 1, wherein the relative current ratio is a phase comparison of the current at each switch with a reference current, resulting in a relative current direction between the two switches.
5. The relaying protection method based on flexible traction network as claimed in claim 4, wherein the judgment of the relative current direction is based on the fact that the current always flows from the high potential point to the low potential point.
6. The relay protection method based on the flexible traction network as claimed in claim 1, wherein the initial value of i and j is 1.
7. The relay protection system based on the flexible traction network comprises the flexible traction network, an internal substation and a subarea substation, and is characterized by further comprising a protection device and a local area network built between the protection devices, wherein the protection device is configured in the substation and the subarea substation.
8. The relay protection system based on the flexible traction network as claimed in claim 7, wherein the protection device comprises: the device comprises a data acquisition module, an operation mode judgment module, a bus voltage monitoring module, a current relative phase comparison calculation module, a current direction comparison module and a result output module; wherein,
the data acquisition module is used for acquiring the bus voltage of the local and adjacent places where the protection device is located, and the current and position state of each switch;
the operation mode judging module is used for judging the operation mode of the current flexible traction network according to the switch position state and sending the operation mode to the bus voltage monitoring module; the current direction comparison module is also used for calling a current direction truth table in the current operation mode according to the operation mode and sending the truth table to the current direction comparison module;
the bus voltage monitoring module is used for monitoring the bus voltage in the current operation mode, and starting the current relative phase ratio calculation module when the bus voltage is smaller than a preset threshold value; when the bus voltage is greater than or equal to a preset threshold value, continuously monitoring the bus voltage;
the current relative phase comparison calculation module is used for selecting the current of the incoming line switch in the current operation mode as a reference current direction, calculating the current relative direction of each of the other switches and simultaneously sending the current relative direction to the current direction comparison module;
the current direction comparison module is used for comparing the current direction of the ith switch with the current direction of the ith switch at the jth fault position in the truth table: when the current directions are inconsistent, executing j to j +1, and continuing comparison operation; and when each current direction is consistent, judging that the truth table is suitable for the current fault, and sending the result to the result output module.
And the result output module is used for outputting the switch number which needs to be tripped when the current fault occurs.
9. The relay protection system based on the flexible traction network as claimed in claim 8, wherein the number of the protection devices configured in the substation or the sub-substation is at least one.
10. The flexible traction network based relay protection system according to claim 8, wherein the initial value of i and j is 1.
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| CN202011045376.6A CN112332382B (en) | 2020-09-28 | 2020-09-28 | Relay protection method and system based on flexible traction network |
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| CN202011045376.6A CN112332382B (en) | 2020-09-28 | 2020-09-28 | Relay protection method and system based on flexible traction network |
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| CN114447972A (en) * | 2021-12-21 | 2022-05-06 | 西南交通大学 | Through flexible traction substation based on existing traction transformer and protection configuration method thereof |
| CN114498575A (en) * | 2021-12-21 | 2022-05-13 | 西南交通大学 | Flexible traction power supply system and fault direction judgment method thereof |
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