Railway electric power telecontrol box transformer substation automatic isolation through line fault judgment method and system

Abstract

The invention relates to the field of electrified railway power systems, and discloses a railway power telecontrol box transformer substation automatic isolation through line fault judgment method and system, and the method comprises the steps: collecting basic data information; executing fault judgment logic to convert the basic data information into fault information of the through line; a fault interval is judged according to the fault occurrence position in the fault information; and executing the fault clearing logic to automatically clear the fault of the fault section, and executing the fault isolation logic to automatically isolate the fault of the non-fault section. The fault section can be automatically, accurately and quickly judged, so that the line power supply efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of the electrified railway power system, and particularly relates to a method and system for automatically isolating and judging the faults of the through line of a railway power telecontrol box substation. Background Art

[0002] At present, the railway power through line is powered by adjacent substations. The distance between the main power supply substation and the standby power supply substation is generally 40 - 60 km. A railway power telecontrol box substation is set every about 3 km to form a ring network power supply to ensure power supply reliability.

[0003] At the present stage, the isolation process of the railway power telecontrol box substation from the fault section of the through line is as follows: First, receive the information such as reclosing, backup power supply automatic switching, and fault tripping of the through line protection and measurement and control device, as well as the fault information of the remote terminal unit (RTU) through the railway power supply dispatching control (SCADA) system; Secondly, confirm the fault section after manual analysis and judgment; Subsequently, send a remote control opening command to the load switches on both sides of the fault section to isolate the fault section; Finally, send a remote control closing command to the circuit breakers of the main power supply substation and the standby power supply substation to restore the power supply of the non-fault area of the through line. However, this method is limited by factors such as the accuracy of manual analysis and the timeliness of manual response, and cannot accurately and quickly determine the fault section, affecting the power supply of the line.

[0004] In view of this, how to design a method and system for automatically isolating and judging the faults of the through line of a railway power telecontrol box substation with high accuracy and timely response is the technical problem to be solved by the present invention. Summary of the Invention

[0005] The present invention provides a method and system for automatically isolating and judging the faults of the through line of a railway power telecontrol box substation, which can accurately and quickly determine the fault section, thereby improving the power supply efficiency of the line.

[0006] To achieve the above technical purpose, the present invention is realized by adopting the following technical solutions:

[0007] In one aspect, the present invention provides a method for automatically isolating and judging the faults of the through line of a railway power telecontrol box substation, including the following steps:

[0008] Collect basic data information;

[0009] Execute the fault judgment logic to convert the basic data information into the fault information of the through line;

[0010] Judge the fault section according to the position where the fault occurs in the fault information;

[0011] Execute the fault removal logic to automatically remove the faults in the fault section, and execute the fault isolation logic to automatically isolate the non-fault section.

[0012] The automatic isolation through-line fault judgment method for railway power remote control box transformers as described above, wherein the basic data information includes:

[0013] The voltage and current transient information of the substation and the through-line feeder, the circuit breaker position information of the substation and the through-line feeder, the voltage and current transient information of the first-class load through-line and the comprehensive load through-line, and the load switch position information of the first-class load through-line and the comprehensive load through-line.

[0014] The automatic isolation through-line fault judgment method for railway power remote control box transformers as described above, wherein the fault judgment logic includes:

[0015] Detect the current transient information of all the circuit breakers and the load switches. If the current of a certain switch is greater than the set fault current value and remains for more than the set time range threshold, it is determined that this switch has a fault, and a fault current signal is sent.

[0016] The automatic isolation through-line fault judgment method for railway power remote control box transformers as described above, the method further includes: performing a fault isolation charging logic before performing the fault removal logic or the fault isolation logic, and the fault isolation charging logic includes:

[0017] The fault isolation function is enabled. If a certain switch is in the closed position, there is no fault current, and there is no fault current in the adjacent switches on both sides, and the ring main unit bus of the through-line is energized and there is no discharge condition, it will turn to the charging state after delaying the fault isolation charging time.

[0018] The automatic isolation through-line fault judgment method for railway power remote control box transformers as described above, the discharge condition is: when a certain switch is in the closed position, the fault isolation function is turned off, the ring main unit bus of the through-line is de-energized, and any one of the delay time range thresholds is satisfied, the charging state will turn to the discharge state.

[0019] The automatic isolation through-line fault judgment method for railway power remote control box transformers as described above, the fault removal logic includes:

[0020] After the fault isolation charging logic is executed, when the through-line fails, a certain load switch detects a fault current, and only one of the left and right load switches of this load switch does not send a fault current signal. After the fault removal delay time, a fault removal action signal is generated to trip this load switch.

[0021] The automatic isolation through-line fault judgment method for railway power remote control box transformers as described above, the fault isolation logic includes:

[0022] When the above-mentioned fault isolation charging logic execution is completed, when a fault occurs in the through line, a certain load switch does not detect a fault current, and it receives a fault current signal from only one of the left and right load switches of this load switch. After the fault isolation delay time, a fault isolation action signal is generated to cause the above-mentioned load switch to trip.

[0023] In another aspect, the present invention provides a railway power telecontrol box substation automatic isolation through line fault judgment system, including:

[0024] Multiple edge gateways, which are arranged in the substation and the railway power telecontrol box substation. The edge gateways are all connected to the same ring network, and the above-mentioned method as described in any one of the preceding items is set in the edge gateways;

[0025] A through line protection and measurement and control device, which is arranged in the through line feeder interval in the substation. The through line protection and measurement and control device is connected to the edge gateway, and the through line protection and measurement and control device is configured to collect the voltage and current transient information of the substation and the through line feeder, and the breaker position information of the substation and the through line feeder;

[0026] A telecontrol terminal device, which is arranged in the railway power telecontrol box substation. The telecontrol terminal device is connected to the edge gateway, and the telecontrol terminal device is configured to collect the voltage and current transient information of the first-class load through line and the comprehensive load through line, and the load switch position information of the first-class load through line and the comprehensive load through line.

[0027] For the above-mentioned railway power telecontrol box substation automatic isolation through line fault judgment system, the telecontrol terminal device is connected to the control circuit, and the control circuit controls the load switch to trip.

[0028] For the above-mentioned railway power telecontrol box substation automatic isolation through line fault judgment system, it is characterized in that the edge gateway is communicatively connected to the through line protection and measurement and control device through the IEC104 protocol, and the edge gateway is communicatively connected to the telecontrol terminal device through the IEC104 protocol.

[0029] Compared with the prior art, the advantages and positive effects of the present invention are:

[0030] (1) By using the fault judgment logic to judge the fault section of the through line, and then using the fault removal logic to automatically remove the fault in the fault section or using the fault isolation logic to automatically isolate the non-fault section, the automatic isolation of faults in each section of the through line of the power telecontrol box substation can be realized;

[0031] (2)Collect basic data through the edge gateway, and build the fault judgment logic, fault removal logic, and fault isolation logic into the edge gateway to achieve the automatic isolation and through-line fault judgment of the railway power telecontrol box transformer based on edge computing, replacing the process of manual fault interval judgment, reducing the time for fault judgment and isolation, and improving the reliability of the railway power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a flowchart of an embodiment of the method for automatically isolating and judging through-line faults of the railway power telecontrol box transformer of the present invention;

[0034] Figure 2 It is a logic diagram for judging the fault of this switch in an embodiment of the method for automatically isolating and judging through-line faults of the railway power telecontrol box transformer of the present invention;

[0035] Figure 3 It is a logic diagram for judging the voltage of the ring main unit bus in an embodiment of the method for automatically isolating and judging through-line faults of the railway power telecontrol box transformer of the present invention;

[0036] Figure 4 It is a logic diagram for judging the no-voltage of the ring main unit bus in an embodiment of the method for automatically isolating and judging through-line faults of the railway power telecontrol box transformer of the present invention;

[0037] Figure 5 It is a fault removal logic diagram in an embodiment of the method for automatically isolating and judging through-line faults of the railway power telecontrol box transformer of the present invention;

[0038] Figure 6 It is a fault isolation logic diagram in an embodiment of the method for automatically isolating and judging through-line faults of the railway power telecontrol box transformer of the present invention;

[0039] Figure 7 It is a logic diagram for judging the no-current state of this load switch in an embodiment of the method for automatically isolating and judging through-line faults of the railway power telecontrol box transformer of the present invention;

[0040] Figure 8 It is a structural schematic diagram of the railway power through-line in an embodiment of the method for automatically isolating and judging through-line faults of the railway power telecontrol box transformer of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In the present invention, unless otherwise clearly defined and limited, the terms such as "install", "connect", "couple", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0045] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0046] As Figure 1 shown, the present invention provides a method for automatically isolating and judging the faults of the through line of a railway power remote control box substation. The railway power remote control box substation is a railway power remote control box-type substation. Hereinafter, the railway power remote control box substation or the box substation will be used for description. The method includes:

[0047] Collect basic data information.

[0048] The basic data information includes: the voltage and current transient information of the substation and the through line feeder collected by multiple edge gateways respectively, the breaker position information of the substation and the through line feeder, the voltage and current transient information of the first-class load through line and the comprehensive load through line, and the load switch position information of the first-class load through line and the comprehensive load through line.

[0049] Execute the fault judgment logic to convert the basic data information into the fault information of the through line.

[0050] The fault judgment logic includes: detecting the current transient information of all breakers and load switches. If the current of a certain switch is greater than the set fault current value and remains for more than the set time range threshold, it means that there is a fault current in this switch (this switch is a breaker or a load switch. For the convenience of description, if the switch includes both a breaker and a load switch, it will be referred to as a "switch" for short). Then it is determined that this switch has a fault and a fault current signal is sent.

[0051] The fault judgment logic diagram is as Figure 2 shown. In the figure, I gz represents the fault current value (open setting); T gz represents the time setting value of having a fault current (open setting); I A represents the current of phase A; I b represents the current of phase B; I c represents the current of phase C; the logic box where Dylon is located represents the logic box of time delay.

[0052] Judge the fault section according to the position where the fault occurs in the fault information.

[0053] When one of the switches is determined to be faulty, the edge gateway immediately sends an output signal of "faulty current" to the edge gateways on both adjacent sides. The output signal of "faulty current" is maintained according to the faulty current state, and the faulty section can be determined. To ensure the reliability of subsequent fault isolation, the output signal of "faulty current" will be maintained for a period of time after the fault disappears, and the duration can be set according to actual production.

[0054] Execute the fault removal logic to automatically remove the fault from the faulty section and execute the fault isolation logic to automatically isolate the non-faulty section.

[0055] To ensure that when a permanent fault occurs in the through line, only the fault removal logic is executed once or only the fault isolation logic is executed, the fault isolation charging logic is executed before the fault removal logic or the fault isolation logic.

[0056] When executing the fault judgment logic, the fault isolation charging logic, the fault removal logic, and the fault isolation logic, it is necessary to ensure that the fault isolation function of the edge gateway is enabled and the communication of the edge gateway is normal. The fault isolation function means that there is a corresponding switch on the edge gateway, and the automatic isolation method for the through line fault of the railway power remote control box transformer can only be implemented after it is enabled. It should be noted here that the fault isolation function refers to the function of isolating the railway power remote control box transformer from the faulty area of the through line. Its enabling and disabling are set on the edge gateway, which is common knowledge in this field, so it will not be elaborated here.

[0057] The fault isolation charging logic includes:

[0058] When the fault isolation function is enabled, if a certain switch is in the closed position, there is no faulty current, and there is no faulty current in the switches on both adjacent sides, and the ring main unit bus of the through line is energized and there are no discharge conditions, after a delay of the fault isolation charging time, it will turn into a charging state. The fault isolation charging time can be set according to actual production requirements and needs to be adjusted.

[0059] The judgment logic for the ring main unit bus being energized is: when the line voltages all exceed the bus voltage setting value and after the bus voltage delay time, a bus voltage signal is generated. The judgment logic diagram for the ring main unit bus being energized is as Figure 3 shown. In the figure, U yy represents the bus voltage setting value; T yy represents the bus voltage time; U ab represents the line voltage between phase A and phase B; U bc represents the line voltage between phase B and phase C; U ca represents the line voltage between phase C and phase B; The logic box where Dylon is located represents the logic box for time delay.

[0060] The discharging condition is as follows: when a certain switch is in the closed position, the fault isolation function is turned off, the ring main unit bus of the through line is without voltage, and any one of the time delay range thresholds is satisfied, the charging state changes to the discharging state.

[0061] The judgment logic for the ring main unit bus without voltage is as follows: when the line voltages are all lower than the no-voltage setting value of the bus, after the no-voltage time delay of the bus, a no-voltage signal of the bus is generated. The judgment logic diagram for the ring main unit bus without voltage is as shown in Figure 4 the figure. In the figure, U wy represents the no-voltage setting value of the bus; T wy represents the no-voltage time of the bus; U ab represents the line voltage between phase A and phase B; U bc represents the line voltage between phase B and phase C; U ca represents the line voltage between phase C and phase B; the logic box where Dylon is located represents the logic box for time delay.

[0062] The fault removal logic includes:

[0063] When the fault isolation function is enabled, the fault isolation charging logic is executed successfully and the edge gateway communication is normal. When a fault occurs in the through line, a certain load switch detects a fault current, and only one of the left and right load switches of this load switch does not send a fault current signal. After the fault removal time delay, a fault removal action signal is generated and a trip command is generated; at the same time, the edge gateway sends the trip command to the remote terminal unit, and the remote terminal unit receives the trip command and the trip circuit operates; if this load switch changes from the closed position to the open position and this load switch is in a no-current state, it means that the fault has been removed successfully. The fault removal logic diagram is as shown in Figure 5 the figure; the logic box where Dylon is located represents the logic box for time delay.

[0064] The fault isolation logic includes:

[0065] When the fault isolation function is enabled, the fault isolation charging logic is executed successfully and the edge gateway communication is normal. When a fault occurs in the through line, a certain load switch does not detect a fault current, and receives that only one of the left and right load switches of this load switch has a fault current signal. After the fault isolation time delay, a fault isolation action signal is generated and a trip command is generated; at the same time, the edge gateway sends the trip command to the remote terminal unit; the remote terminal unit receives the trip command and the trip circuit operates; if this load switch changes from the closed position to the open position and this load switch is in a no-current state, the fault isolation is successful. The fault isolation logic diagram is as shown in Figure 6 the figure; the logic box where Dylon is located represents the logic box for time delay.

[0066] The judgment logic for the no-current state of this load switch is as follows: When the phase currents are all lower than the no-current setting value and pass through the no-current delay time, a no-current signal is generated. The judgment logic diagram for the no-current state of this load switch is as shown in Figure 7 the following figure. In the figure, I wl represents the no-current setting value; T wl represents the no-current time; I a represents the phase current of phase A; I b represents the phase current of phase B; Ic represents the phase current of phase C; the logic box where Dylon is located represents the logic box for time delay.

[0067] In another aspect, the present invention provides a railway power remote control box substation automatic isolation through-line fault judgment system, including:

[0068] Multiple edge gateways are provided in the substation and the railway power remote control box substation. The edge gateways are all connected to the same ring network, and the above-mentioned method is set in the edge gateways.

[0069] A through-line protection and measurement and control device is provided in the through-line feeder interval of the substation. The through-line protection and measurement and control device is connected to the edge gateway. The through-line protection and measurement and control device has functions such as reclosing, backup power supply automatic switching, and three-stage overcurrent, and can collect the voltage and current transient information of the substation and the through-line feeder, and the circuit breaker position information of the substation and the through-line feeder. The voltage and current transient information of the substation and the through-line feeder interval includes phase voltage, phase current, zero-sequence current, zero-sequence voltage, and line voltage.

[0070] Multiple remote terminal units include: One remote terminal unit is provided in each railway power remote control box substation. The remote terminal unit is connected to the edge gateway. The remote terminal unit can collect the voltage and current transient information of the first-class load through-line and the comprehensive load through-line, the load switch position information of the first-class load through-line and the comprehensive load through-line, perform fault removal actions, and perform fault isolation actions. The voltage and current transient information of the first-class load through-line and the comprehensive load through-line includes line voltage and phase current.

[0071] The remote terminal unit is connected to the control circuit. The opening of the load switch is controlled by the control circuit. The remote terminal unit itself has a relay output interface. After the remote terminal unit receives the opening command sent by the edge gateway, the corresponding relay output interface acts, and then the load switch will open.

[0072] The edge gateway is communicatively connected to the through-line protection and measurement and control device through the IEC104 protocol, and the edge gateway is communicatively connected to the remote terminal unit through the IEC104 protocol. The IEC104 protocol is applicable to the railway power industry.

[0073] In the prior art, the isolation of the circuit power remote box substation from the fault section of the through line depends on manual analysis and judgment, and the fault section is isolated by manually issuing a remote control opening command. Limited by the accuracy and response timeliness of manual work, it is difficult to quickly and accurately determine the fault section, and it is easy to make judgment errors due to subjective factors. In this application, the edge gateway collects voltage and current transient information and switch position information in real time, and uses the built-in logic to quickly judge the fault. Compared with manual analysis, the fault section can be determined clearly in a very short time, greatly reducing the fault location time; quick fault judgment and automatic isolation can reduce the impact of the fault on the power supply of the non-fault section, ensure the continuity of railway power supply, and thus improve the stability of the power supply system; judgment and operation are carried out based on the preset logic and the real-time collected data, excluding the interference of human factors, improving the accuracy of fault judgment and isolation, and reducing the risk of power supply accidents caused by human errors.

[0074] This application is illustrated by Substation A and Substation B:

[0075] The railway power through line consists of a power supply line and a railway power remote box substation, including a first-class load through line and a comprehensive load through line, both of which are double-end power supplies. In this embodiment, the first-class load through line is supplied from Substation A to Substation B, and the comprehensive load through line is supplied from Substation B to Substation A. Among them, the reverse of Substation B of the first-class load through line is in the standby mode, and the reverse of Substation A of the comprehensive load through line is in the standby power supply mode.

[0076] Edge gateways are configured in both the substation and the railway power remote box substation, and communicate with the through line protection and measurement control device and the remote terminal device through the IEC104 protocol. All edge gateways are connected to the same ring network and perform data interaction with the adjacent edge gateways on both sides. As Figure 8 shown, Figure 8 the switch types, switch locations, and switch numbers are shown in Table 1 below. Taking the edge gateway in Box Substation 1 as an example of this edge gateway, the adjacent edge gateways on both sides refer to the edge gateways in Substation A and Box Substation 2. Through the logic built in the edge gateway, operations such as switch fault judgment, fault removal, and fault isolation are completed, and the corresponding load switch is controlled to act to achieve automatic isolation of the through line fault of the railway power remote box substation. It should be noted that the switch includes a circuit breaker and a load switch. The switch in the feeder interval of the substation is a circuit breaker, and the switch in the ring main unit (including the ring main incoming cabinet and the ring main outgoing cabinet) of the railway power remote box substation is a load switch. Only the load switch can perform fault removal or fault isolation actions.

[0077] Table 1

[0078] Location Cabinet Switch Number Switch Type Transformer Substation A Through-Feed Line Feeder Bay QF1 Circuit Breaker Distribution Transformer 1 Ring Main Unit Incoming Cabinet QL1 Load Switch Ring Main Unit Outgoing Cabinet QL2 Load Switch Distribution Transformer 2 Ring Main Unit Incoming Cabinet QL3 Load Switch Ring Main Unit Outgoing Cabinet QL4 Load Switch Distribution Transformer 3 Ring Main Unit Incoming Cabinet QL3 Load Switch Ring Main Unit Outgoing Cabinet QL4 Load Switch Transformer Substation B Through-Feed Line Feeder Bay QF2 Circuit Breaker

[0079] (1) Taking the failure of the first-class load through line as an example: If a fault occurs between the circuit breaker QF1 of the through line feeder interval in Substation A and the load switch QL1 of the ring network incoming switch cabinet of Box-type Substation 1, it is a fault of the first-class load through line between the substation and the ring network incoming switch.

[0080] 1. When the fault occurs, QF1 detects the fault current, while neither QL1 nor QL2 detects the fault current. That is, QL1 does not detect the fault current and receives a communication signal indicating that only one of the left switch (QF1) and the right switch (QL2) "has fault current". After the fault tripping delay time, this load switch trips.

[0081] 2. The circuit breaker QF1 of the through line feeder interval in Substation A trips due to the instantaneous tripping action.

[0082] 3. The circuit breaker QF2 of the through line feeder interval in Substation B closes due to the backup power supply automatic switching action.

[0083] 4. The circuit breaker QF2 of the through line feeder interval in Substation B trips due to the post-acceleration action.

[0084] 5. The circuit breaker QF1 of the through line feeder interval in Substation A closes due to the reclosing action.

[0085] 6. The circuit breaker QF1 of the through line feeder interval in Substation A trips due to the post-acceleration action.

[0086] 7. When the fault isolation delay time expires, a fault isolation action signal is generated, and at the same time, a tripping command is sent to the remote terminal unit (RTU); the remote terminal unit (RTU) receives the tripping command, and the tripping circuit operates; QL1 changes from the closed position to the open position, and QL1 is in a no-current state, then the "fault isolation successful" signal is output.

[0087] (2) An example of the first-class load through line fault, such as a fault occurring between the load switch QL6 of Box-type Substation 3 and the circuit breaker QF2 of the through line feeder interval in Substation B, is a fault of the first-class load through line between the substation and the ring network outgoing switch.

[0088] When the fault occurs, both QL5 and QL6 detect the fault current, while QF2 does not detect the fault current. That is, QL6 detects the fault current and receives a communication signal indicating that only one of the left switch (QL5) and the right switch (QF2) has not sent the "has fault current" signal. After the fault removal delay time, this load switch trips.

[0089] The circuit breaker QF1 of the through line feeder interval in Substation A trips due to the instantaneous tripping action.

[0090] The circuit breaker QF2 of the through line feeder interval in Substation B closes due to the backup power supply automatic switching action.

[0091] The circuit breaker QF2 of the through line feeder interval in Substation B trips due to the post-acceleration action.

[0092] The feeder interval QF1 of the through line in Substation A is closed due to reclosing operation.

[0093] The feeder interval QF1 of the through line in Substation A trips due to accelerated reclosing operation.

[0094] When the fault clearing delay time expires, a fault clearing action signal is generated, and at the same time, a trip command is sent to the remote terminal unit (RTU); the remote terminal unit (RTU) receives the trip command, and the trip circuit operates; QL6 changes from the closed position to the open position, and QL6 is in a no-current state, then the "fault cleared successfully" signal is output.

[0095] (3) Fault examples of the first-class load through line. For example, a fault occurs between the load switch QL2 of the ring network outgoing line cabinet of Box-type Substation 1 and the load switch QL3 of the ring network incoming line cabinet of Box-type Substation 2, which is a fault of the first-class load through line between the ring network outgoing switch and the ring network incoming switch between box-type substations.

[0096] When the fault occurs, fault current is detected by both QL1 and QL2, and no fault current is detected by QL3 and QL4. Fault current is detected by QL2, and only one of the left switch (QL1) and the right switch (QL3) does not send a "fault current present" communication signal. After the fault clearing delay time, this load switch trips. No fault current is detected by QL3, and it receives that only one of the left switch (QL2) and the right switch (QL4) does not send a "fault current present" communication signal. After the fault clearing delay time, this load switch trips. The feeder interval QF1 of the through line in Substation A trips due to instantaneous trip operation.

[0097] The feeder interval QF2 of the through line in Substation B is closed due to the operation of the backup power supply automatic switching device.

[0098] The feeder interval QF2 of the through line in Substation B trips due to accelerated reclosing operation.

[0099] The feeder interval QF1 of the through line in Substation A is closed due to reclosing operation.

[0100] The feeder interval QF1 of the through line in Substation A trips due to accelerated reclosing operation.

[0101] When the fault clearing delay time expires, a fault clearing action signal is generated, and at the same time, a trip command is sent to the remote terminal unit (RTU); the remote terminal unit (RTU) receives the trip command, and the trip circuit operates; QL2 changes from the closed position to the open position, and QL2 is in a no-current state, then the "fault cleared successfully" signal is output.

[0102] When the fault isolation delay time is up, a fault isolation action signal is generated, and a trip command is sent to the remote terminal unit (RTU); the remote terminal unit (RTU) receives the trip command, and the trip circuit is activated; QL3 changes from the closed position to the open position, and QL3 is in a no-flow state, then a "fault isolation successful" signal is output.

[0103] Other fault modes include the comprehensive load through-line fault between the distribution station and the ring network incoming switch, the comprehensive load through-line fault between the distribution station and the ring network outgoing switch, and the comprehensive load through-line fault between the ring network outgoing switch and the ring network incoming switch between the box-type substations. The fault judgment logic, fault removal, fault isolation and other logics of this switch are as follows: Figure 2 , Figure 5 and Figure 6 As shown, the failure process is basically the same as the failure instance process described above, and will not be repeated here.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0105] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

[0106] Wherever possible, the various aspects and features described and shown in the specification may be applied separately and these separate aspects may be made the subject of divisional applications.

Claims

1. A method for judging the fault of a railway electric telecontrol box transformer automatically isolating a through-line, characterized in that: The following steps are involved: Collect basic data information; Executing fault judgment logic to convert the basic data information into fault information of the through line; Determine the fault interval according to the location where the fault occurs in the fault information; The fault removal logic is executed to automatically remove the fault in the faulty section, and the fault isolation logic is executed to automatically isolate the fault in the non-faulty section.

2. The method for judging the fault of the railway electric telecontrol box transformer automatic isolation through line according to claim 1 is characterized in that: The basic data information includes: The voltage and current transient information of the substation and the through-line feeder, the circuit breaker position information of the substation and the through-line feeder, the voltage and current transient information of the primary load through-line and the comprehensive load through-line, and the load switch position information of the primary load through-line and the comprehensive load through-line.

3. The method for judging the fault of the railway electric telecontrol box transformer automatic isolation through line according to claim 2 is characterized in that: The fault judgment logic includes: The current transient information of all the circuit breakers and the load switches is detected. If the current of a certain switch is greater than the set fault current setting value and is maintained for more than the set time range threshold, it is determined that the switch is faulty and a fault current signal is issued.

4. The method for judging the fault of the railway electric telecontrol box transformer automatic isolation through line according to claim 3 is characterized in that: The method further includes: executing a fault isolation charging logic before executing the fault removal logic or executing the fault isolation logic, the fault isolation charging logic including: If a switch is in the closed position, there is no fault current and there is no fault current in the switches on the adjacent two sides, the busbar of the ring network cabinet of the through line is pressurized and there is no discharge, and all the conditions are met, it will be transferred to the charging state after the delayed fault isolation charging time.

5. The method for judging the fault of the railway electric telecontrol box transformer automatic isolation through line according to claim 4 is characterized in that: The discharging condition is: when a switch is in the closed position, the fault isolation function is turned off, the ring main unit bus of the through line is without pressure and any one of the delay time range thresholds is met, the charging state is changed to the discharging state.

6. The method for judging the fault of the railway electric telecontrol box transformer automatic isolation through line according to claim 4 is characterized in that: The fault removal logic includes: The fault isolation charging logic is executed. When the through line fails, a load switch detects a fault current, and only one of the left load switch and the right load switch of the load switch does not send a fault current signal. After the fault removal delay time, a fault removal action signal is generated to cause the load switch to open.

7. The method for judging the fault of the railway electric telecontrol box transformer automatic isolation through line according to claim 4 is characterized in that: The fault isolation logic includes: The fault isolation charging logic is executed. When a through line fails, a load switch does not detect the fault current, and receives a fault current signal from the left load switch and the right load switch of the load switch. After the fault isolation delay time, a fault isolation action signal is generated to cause the load switch to open.

8. A railway electric telecontrol box-type transformer automatic isolation through-line fault judgment system, characterized in that: include: Multiple edge gateways are arranged in a substation and a railway electric telecontrol box-type substation, the edge gateways are all connected to the same ring network, and the edge gateways are provided with the method according to any one of claims 1 to 7; A through-line protection and measurement and control device is arranged in the through-line feeder interval in the substation, the through-line protection and measurement and control device is connected to the edge gateway, and the through-line protection and measurement and control device is configured to collect voltage and current transient information of the substation and the through-line feeder, and circuit breaker position information of the substation and the through-line feeder; A remote control terminal device is arranged in a railway electric power remote control box-type substation. The remote control terminal device is connected to the edge gateway. The remote control terminal device is configured to collect voltage and current transient information of the primary load through-line and the comprehensive load through-line and load switch position information of the primary load through-line and the comprehensive load through-line.

9. A railway electric telecontrol box-type transformer automatic isolation through-line fault judgment system according to claim 8, characterized in that: The remote terminal device is connected to a control circuit, and the control circuit controls the opening of the load switch.

10. A railway electric telecontrol box-type transformer automatic isolation through-line fault judgment system according to claim 8, characterized in that: The edge gateway is connected to the through-line protection measurement and control device through the IEC104 protocol, and the edge gateway is connected to the remote control terminal device through the IEC104 protocol.

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