Method for determining fault removal power supply partition based on substation coding

Abstract

The invention discloses a method for determining and removing a fault power supply partition based on substation codes, which comprises the following steps: arranging a disconnection judgment device near a lower anchor post, arranging a redundant GOOSE switch and a fault partition judgment device in a substation, and connecting the fault partition judgment device and each disconnection judgment device to the redundant GOOSE switch in the substation. Then all the redundant GOOSE switches are connected to establish an inter-station redundant GOOSE network; sequentially coding the substations according to the sequence, and coding the anchor sections, the direct current feeder circuit breakers and the cross-zone switches based on the codes of the substations; the broken line judgment device sends broken line fault information containing the coding information to the fault partition judgment device of the substation, and the fault partition judgment device analyzes and determines a corresponding direct-current feeder circuit breaker according to the received coding information and sends a tripping command; and the other fault partition judgment devices further judge whether to send tripping information to the circuit breaker in the substation or not according to the disconnection fault information shared by the GOOSE networks in combination with the opening and closing information of the cross-zone switch.

Description

Technical Field

[0001] This invention belongs to the field of fault protection technology for DC power supply systems of electrified highways, and specifically relates to a method for determining and cutting off faulty power supply zones based on substation coding. Background Technology

[0002] Electrified highways refer to roads equipped with electric traction power supply systems along their routes, enabling motor vehicles to continuously obtain driving power from the traction network during operation. Their defining characteristic is the provision of uninterrupted power to vehicles in motion, representing a new mode of rail transit. In traditional urban rail transit and trunk railways where locomotives provide continuous power, a contact network is installed along the line as the positive terminal, and the running rail or dedicated return rail as the negative terminal. When a contact network failure occurs, it typically sags and connects to the running rail or a metal grounding electrode, creating a short circuit between the positive and negative terminals. The resulting large short-circuit current triggers current protection, causing the corresponding circuit breaker in the substation to trip. Even if the contact network failure does not connect to the running rail and no abnormal short-circuit current is generated, urban rail transit or trunk railways, being closed and independent right-of-way, will not pose a danger to the public.

[0003] For electrified highways, apart from the overhead contact line as the positive pole, no metal conductors are installed on the ground as the negative pole for return current. Instead, the same overhead contact line is installed as the negative pole for return current. When the overhead contact line breaks, there is no possibility of the positive or negative contact line connecting to the ground metal conductor to form a short circuit current. Conventional current protection fails, so the corresponding circuit breaker in the substation will not trip. At the same time, electrified highways do not have independent right-of-way. A broken overhead contact line while energized can easily cause personal injury and property damage to passing vehicles or people, which contradicts the original intention of safe and efficient transportation. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a method for determining fault-free power supply zones based on substation coding. This method overcomes the difficulties in applying existing technologies, significantly improves operational safety, saves inspection resources, and reduces safety risks.

[0005] This invention achieves this objective through the following technical solution: A method for determining fault-free power supply zones based on substation coding includes the following: A wire breakage detection device is installed near the lower anchor column of the contact wire anchor section of the DC traction power supply system of electrified highways. The device determines whether a wire breakage has occurred by real-time monitoring of the physical parameters collected by the sensor installed on the weight of the lower anchor compensation device. Each substation is equipped with a redundant GOOSE switch and a fault zone detection device. In the case of single-sided power supply, each substation connects all the disconnection detection devices installed in its own power supply zone or in the case of double-sided power supply, the half power supply zone that is physically closer in the power supply zone of the substation to the redundant GOOSE switch in the substation, forming a redundant GOOSE network in the substation. The redundant GOOSE switches in all substations are connected to form a redundant GOOSE network between substations, realizing information sharing within and between substations. Each substation is coded sequentially, and then each anchor section, each feeder circuit breaker, and each cross-zone switch is coded based on the substation coding. After the disconnection detection device determines that the contact wire is disconnected, it sends the disconnection fault information, which includes the anchor section code, to the fault zone detection device it is connected to through the redundant GOOSE network within the station. The fault zone detection device that receives the disconnection fault information analyzes and determines the corresponding DC feeder circuit breaker based on the anchor section code information and the collected position status information of the cross-zone switch, and sends a trip command. The fault information of the contact network disconnection and the tripping information of the DC feeder circuit breaker are sent to the fault zone judgment device of the adjacent substation through the redundant GOOSE network between substations. The fault zone judgment device of the adjacent substation then further judges whether to send the tripping information to the DC feeder circuit breaker in its own substation based on the opening and closing information of the cross-zone switch. Finally, the contact network disconnection fault information and DC feeder circuit breaker tripping information of each anchor section of the entire line are shared.

[0006] Furthermore, the anchor segment coding information includes "anchor segment identifier, uplink and downlink information, anchor segment type, anchor segment location information, anchor segment sequence number, and half-zone information within the anchor segment".

[0007] Furthermore, when the "anchor segment type" represents the code of an anchor segment located at the substation exit that crosses the power supply zone, the "anchor segment number" in the anchor segment code information is omitted, and the "anchor segment location information" is the code of three consecutive substations, namely the substation at the exit and the three adjacent substations on both sides. Among them, the adjacent substations missing in the "anchor segment location information" of the anchor segment located at the exit of the substation at both ends of the line that crosses the power supply zone are represented by a blank space " / ".

[0008] Furthermore, the power supply system is a bidirectional power supply mode. When the "anchor segment type" represents the code of a complete anchor segment located within a power supply zone, the "anchor segment location information" in the anchor segment code information is the code of the substation on both sides of the power supply zone where the anchor segment is located, and a " / " is inserted between the two substation codes to indicate a blank space. In the anchor segment code information of a complete anchor segment located within a power supply zone at both ends of the line, the adjacent substation that is missing in the "anchor segment location information" is represented by a blank " / ".

[0009] Furthermore, when the power supply system is a unidirectional power supply mode, and the "anchor segment type" represents the code of a complete anchor segment located within the power supply zone, the "anchor segment location information" in the anchor segment code information is an sequential arrangement of the substation code that supplies power to the power supply zone and the substation code that supplies power to the power supply zone on the other side of the cross-zone switch of the power supply zone, with a " / " inserted between the two substation codes to indicate a space.

[0010] Furthermore, the DC feeder circuit breaker coding information includes "circuit breaker identifier, uplink and downlink information, substation code where the DC feeder circuit breaker is located, and substation codes on both sides of the power supply zone supplied by the DC feeder circuit breaker".

[0011] Furthermore, when the power supply system is a bidirectional power supply mode, the cross-regional switch coding information includes "cross-regional switch identifier, up and down information, and the codes of the substation where the cross-regional switch is located and the three consecutive substations of the adjacent substations on both sides", wherein the missing adjacent substations in the cross-regional switch coding information at both ends of the line are represented by the empty space " / ".

[0012] Furthermore, when the power supply system is a unidirectional power supply mode, the cross-regional switch coding information includes "cross-regional switch identifier, up and down information, and substation codes on both sides of the cross-regional switch".

[0013] Furthermore, when the cross-zone switch connected to the power supply zone with the open circuit fault is in the closed state, the fault zone judgment device of the substation that maintains electrical connection with the power supply zone with the open circuit fault sends a trip command to the DC feeder circuit breaker on the side of the closed cross-zone switch of that substation.

[0014] Compared with the prior art, the beneficial effects of this invention are as follows: 1) This invention enables power outage of the corresponding power supply section after the contact wire breaks, greatly improving the safety of the system.

[0015] 2) This invention has no impact on overhead contact lines and vehicles, and poses no safety risks.

[0016] 3) This invention enables the location of broken anchor sections in the overhead contact line, thereby improving the speed of fault location.

[0017] 4) This invention uses a communication method to replace the hard contact method, which reduces the number of control cables and facilitates construction.

[0018] 5) This redundant GOOSE network can be used as a shared network for the DC traction power supply system or the entire power supply system, establishing a fast and reliable redundant communication platform. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the network structure for the method of cutting off faulty power supply zones using a bilateral power supply approach according to an embodiment of the present invention; Figure 2This is a schematic diagram of the network structure for the method of cutting off faulty power supply zones using a single-sided power supply mode according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the power supply zone and anchor section setting model of the DC traction power supply system with bilateral power supply mode according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a DC traction power supply system with single-sided power supply according to an embodiment of the present invention; Figure 5 This is an illustration illustrating the anchor segment coding of the bilateral power supply method in an embodiment of the present invention; Figure 6 This is a diagram illustrating the coding of a DC feeder circuit breaker according to an embodiment of the present invention; Figure 7 This is an illustration illustrating the cross-zone switch coding in a bilateral power supply method according to an embodiment of the present invention; Figure 8 This is an illustration illustrating the anchor segment coding for a single-sided power supply method according to an embodiment of the present invention; Figure 9 This is an illustration illustrating the cross-zone switch coding in a single-sided power supply mode according to an embodiment of the present invention. Detailed Implementation

[0020] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] In the DC traction power supply system of electrified highways, when a contact wire or catenary cable of the overhead contact system breaks, the weight that applies tension to the contact wire (or catenary cable) will fall downwards. As a result, the weight will generate acceleration relative to the ground, and the angular acceleration of the ratchet (or pulley) at the lower anchor post will also change accordingly.

[0022] The intelligent unit installed on-site near the lower anchor bolt where the weight is installed is mainly used to determine the fault of contact wire breakage, and is therefore defined as a "breakage detection device" in this patent. This device corresponds to half of the anchor section, that is, each anchor section is divided into left and right half anchor section sections by the middle anchor, and a breakage detection device is set in each of the left and right anchor section sections.

[0023] Each substation is equipped with redundant GOOSE switches to form an intra-substation redundant GOOSE network. In addition, an intelligent unit, the "Fault Zone Judgment Device," is installed, which, along with the line failure judgment devices located in the left and right halves (for bilateral power supply) or the entire (for single power supply) power supply zone (including uplink and downlink), connects to the intra-substation redundant GOOSE network to achieve information sharing. Specifically, each substation has one fault zone judgment device. Line failure judgment devices in the physically closer half of the power supply zone (for bilateral power supply) or within the substation's power supply zone (for single power supply) directly send line failure information to the fault zone judgment device through the intra-substation redundant GOOSE network. A redundant GOOSE network is established between substations, using optical fibers to connect the redundant GOOSE switches in different substations to achieve inter-substation information sharing. That is, the fault zone judgment devices in one substation send line failure information and DC feeder circuit breaker tripping information to the fault zone judgment devices in adjacent substations through the inter-substation redundant GOOSE network. As a result, information on contact wire breakage faults and DC feeder circuit breaker tripping in each anchor section within the entire power supply zone of the line can be shared.

[0024] The fault zone identification device can not only directly collect contact wire breakage fault information of each anchor section within the entire power supply zone through the redundant GOOSE network, but also collect the closing and opening position information of each cross-zone switch. Based on all the information, it performs processing, analysis, and logical judgment to determine the faulty power supply zone. Then, it sends a trip command to the corresponding DC feeder circuit breaker to complete the rapid and accurate fault isolation. A network configuration diagram of the bilateral power supply method for isolating faulty power supply zones is shown below. Figure 1 A schematic diagram of the network structure for the method of isolating faulty power supply zones under single-sided power supply is shown below. Figure 2 As shown in the figure, only the downward movement is illustrated; the upward movement is the same as the downward movement and has been ignored.

[0025] In the DC traction power supply system for electrified highways, the contact wire and catenary wire of the overhead contact system are connected by droppers spaced 3m to 8m apart and anchored to anchor posts spaced 40m to 60m apart within each power supply zone. Within each bilateral or unilateral power supply zone, the anchor sections are connected by non-insulated joints to form an electrical connection between them. However, at the substation outlet, to achieve isolation between power supply zones, a segmented insulator is installed in the middle of the anchor section, thus forming two electrically isolated sections.

[0026] Therefore, it can be seen that when the DC feeder circuit breaker supplies power to this power supply zone, it is essentially supplying power to the anchor sections that form the electrical connection. In the bilateral power supply method, each power supply zone includes half anchor sections located at the outlets of the two substations and several complete anchor sections in the middle, such as... Figure 1As shown; in the single-sided power supply mode, each power supply zone includes half an anchor section located at the substation outlet and several subsequent complete anchor sections, such as... Figure 2 As shown.

[0027] Taking a dual-power supply system with five traction substations as an example, the schematic diagram of the DC traction power supply system with dual-power supply is as follows: Figure 3 As shown in the diagram (only the downlink is illustrated; the uplink is the same as the downlink and is ignored), each power supply zone is distinguished by a different color: For a complete anchor section located in the middle of a bilateral power supply zone, when a line breakage fault occurs in one of the anchor sections, the corresponding line breakage detection device determines the line breakage fault and, based on the normal bilateral power supply or the large bilateral power supply operation condition of a substation disconnection, trips the feeder circuit breakers at both ends of the corresponding power supply zone or the large power supply zone, thus completing the fault clearing of the faulty power supply zone; For an anchor section located at the substation outlet, since it bridges two power supply zones, when a line breakage fault occurs, the corresponding line breakage detection device determines the line breakage fault and, based on the normal bilateral power supply or the large bilateral power supply operation condition of a substation disconnection, trips the feeder circuit breakers of the corresponding two or three power supply zones, thus completing the fault clearing of the faulty zone. Figure 3 Taking the five traction substations shown (downstream only) as an example, under normal operation and operation with a substation disconnected, when a line breakage fault occurs in any anchor section, the corresponding tripped DC feeder circuit breaker is as follows: Figure 3 The table shows (the DC feeder circuit breakers shown in parentheses in the table are equipment in the disconnected substation).

[0028] It is not difficult to see that for a complete anchor section located in the middle of a bilateral power supply zone, such as an anchor section located within power supply zones AB, BC, CD, or DE, when neither of the substations at either end of the bilateral power supply zone has disconnected, the tripping switch in the event of a line breakage fault in the anchor section is the corresponding two DC feeder circuit breakers supplying power to that power supply zone (e.g., ...). Figure 2 When power supply zones AB, BC, CD, and DE are all in normal operating mode; however, when a substation is disconnected, in the event of a line breakage fault in an anchor section, the tripping switch should include, in addition to the two corresponding DC feeder circuit breakers supplying power to this power supply zone, the two additional DC feeder circuit breakers of the adjacent power supply zone connected to the disconnected substation's inter-zone switch (e.g., Figure 3When the anchor sections of power supply zones AB, BC, CD, and DE are respectively disconnected from substation B, B or C, C or D, or D. For anchor sections located at the substation outlet bridging two power supply zones, such as anchor sections located at the outlets of substations A, B, C, D, and E, regardless of whether the substation itself is disconnected, in the event of a line breakage fault in the anchor section, the tripping switch will be the four DC feeder circuit breakers connected to the two adjacent substations (e.g., ...). Figure 3 The anchor sections installed at the exits of substations A, B, C, D, and E are not in situations where substation B is disconnected, substation C is disconnected, substation B or D is disconnected, substation C is disconnected, or substation D is disconnected. However, when a substation in one of the two connected power supply zones is disconnected, in the event of a line breakage fault in the anchor section, the tripping switch should include, in addition to the four DC feeder circuit breakers supplying power to the two adjacent substations connected, the other two DC feeder circuit breakers in the adjacent power supply zone connected to the disconnected substation's cross-zone switch (e.g., ...). Figure 3 The anchor sections set at the exits of substations A, B, C, D, and E are respectively in the following situations: substation B is disconnected, substation C is disconnected, substation B or substation D is disconnected, substation C is disconnected, and substation D is disconnected.

[0029] Taking three traction substations as an example, the schematic diagram of a DC traction power supply system with single-sided power supply is as follows: Figure 4 As shown in the diagram (only the downlink is illustrated; the uplink is the same as the downlink and is ignored), each power supply zone is distinguished by a different color: For a complete anchor section located in the middle of a single-sided power supply zone, when a line breakage fault occurs in one of the anchor sections, the corresponding line breakage judgment device determines the line breakage fault and, based on the normal single-sided power supply or the large single-sided power supply disconnected from a substation (the condition of the cross-zone switch being closed), trips the corresponding power supply zone or the large power supply zone feeder circuit breaker, thus completing the fault clearing of the faulty power supply zone; For an anchor section located at the substation outlet, since it bridges two power supply zones, when a line breakage fault occurs, the corresponding line breakage judgment device determines the line breakage fault and, based on the normal single-sided power supply or the large single-sided power supply disconnected from a substation, trips the feeder circuit breakers of the corresponding two or three / four power supply zones, thus completing the fault clearing of the faulty zone. Figure 4 Taking the three traction substations shown (downstream only) as an example, under normal operation and operation with one substation disconnected, when a line breakage fault occurs in any anchor section, the corresponding tripped DC feeder circuit breaker is as follows: Figure 4 The table shows (the DC feeder circuit breakers shown in parentheses in the table are equipment in the disconnected substation).

[0030] It is therefore easy to see that for a complete anchor section located in the middle of a single-sided power supply zone, such as anchor sections located in power supply zones A3, B1, and C1, when the substation of the single-sided power supply zone has not been disconnected, the tripping switch in the event of a line breakage fault in the anchor section is the corresponding DC feeder circuit breaker supplying power to that power supply zone (e.g., ...). Figure 4 When power supply zones A3, B1, B3, and C1 are all in normal operating mode; and when a substation is disconnected, in the event of a line breakage fault in an anchor section, the tripping switch should include, in addition to the corresponding DC feeder circuit breaker supplying power to this power supply zone, the DC feeder circuit breaker of the adjacent power supply zone connected to the cross-zone switch (such as...). Figure 4 When the anchor sections of power supply zones A3, B1, B3, and C1 are respectively disconnected from substation A or B, or from substation B or C. For anchor sections located at the substation outlet bridging two power supply zones, such as anchor sections at the outlets of substations A, B, and C, if the substation and its two adjacent substations are not disconnected, and a line breakage fault occurs in the anchor section, the trip switch of the two DC feeder circuit breakers supplying power to the substation (e.g.) Figure 4 The anchor sections installed at the exits of substations A, B, and C are not in situations where substations A or B are disconnected, A, B, or C are disconnected, or B or C is disconnected, respectively. However, when a disconnection occurs at this substation or between the two adjacent substations, the tripping switch in case of a line breakage fault at the anchor section should include not only the two DC feeder circuit breakers supplied by this substation, but also the DC feeder circuit breakers of the adjacent power supply zone (such as...). Figure 4 The anchor sections set at the exits of substations A, B, and C are respectively located when substation A or B is disconnected, substation A or B or C is disconnected, and substation B or C is disconnected.

[0031] Therefore, each of the above-mentioned anchor sections, DC circuit breakers, and cross-zone switches is numbered.

[0032] The specific numbers of each anchor section, DC circuit breaker, and cross-zone switch for the bilateral power supply method are as follows: Anchor segment numbering as follows Figure 5As shown, each anchor segment is numbered in the format "MD-S / X-Anchor Segment Type-Substation Code (-Serial Number)-Location within Anchor Segment" (the serial number is limited to the complete anchor segment type in the middle). Each digit of the code has a fixed coded address. The coded address MD1 indicates either uplink (S) or downlink (X). The coded address MD2 indicates the anchor segment type, which corresponds to the numbers 2 and 3 respectively: a complete anchor segment located in the middle of a bilateral power supply zone and an anchor segment located at the substation outlet bridging two power supply zones. The coded addresses MD3, MD4, and MD5 correspond to the substation codes and are ordered from left to right according to the DC power supply system diagram: For a complete anchor segment located in the middle of a bilateral power supply zone, the codes of the substations at both ends of the power supply zone are arranged in order, with a " / " indicating a space in the middle. That is, MD4 is fixed as " / ", MD3 is the code of the left adjacent substation, and MD5 is the code of the right adjacent substation. When it is a terminal station, the missing adjacent substation is represented by a space " / ". For an anchor segment located at the substation outlet that spans two power supply zones, the codes of the three substations spanning the two power supply zones are arranged in order. When the substation is a terminal station, the missing adjacent substation is represented by a space " / ". A complete anchor segment located in the middle of a bilateral power supply zone generally contains multiple segments, so a serial number is used to distinguish them; for an anchor segment located at the substation outlet that spans two power supply zones, there is only one segment, so the serial number can be omitted. Within the anchor section, the area is divided into left and right halves of the anchor section according to the substation arrangement order in the DC power supply system diagram, with the middle anchor as the boundary. Each half corresponds to a line break detection device.

[0033] For example, the downlink anchor sections set within the power supply zone between substation C and substation D are sequentially numbered as MD-X-2-C / D-1-Z, MD-X-2-C / D-1-Y, MD-X-2-C / D-2-Z, MD-X-2-C / D-2-Y, MD-X-2-C / D-3-Z, MD-X-2-C / D-3-Y... The downlink left-side anchor section set at the exit of substation C, bridging power supply zones BC and CD, involves substations B, C, and D, and is numbered as MD-X-3-BCD-Z.

[0034] To facilitate the isolation of fault power supply zones after a contact wire breakage, a new numbering system based on the substation code is defined for DC feeder circuit breakers that already have dispatch switch numbers. The numbering is as follows: Figure 6 As shown, the code is numbered "DL-S / X-Substation Code-Substation Codes at Both Ends of Power Supply Zone," with each digit having a fixed address. Address DL1 indicates the uplink (S) or downlink (X). Address DL2 indicates the substation it belongs to. Addresses DL3 and DL4 correspond to the substation codes, arranged from left to right according to the DC power supply system diagram. When a substation is a terminal substation, the adjacent substation is represented by a space " / ".

[0035] For example, the DC feeder circuit breakers supplying power to the downstream of power supply zone CD are C3 of station C and D1 of station D, with corresponding numbers DL-XC-CD and DL-XD-CD.

[0036] Inter-zone switch numbering as follows Figure 7 As shown, for the cross-regional switches within each substation, the numbering is "GK-S / X-code of three substations bridging two power supply zones," with each digit having a fixed address. Address GK1 indicates uplink or downlink. Addresses GK2, GK3, and GK4 correspond to the codes of the three substations in the two power supply zones bridged by the cross-regional switch, arranged from left to right according to the power supply direction in the DC power supply system diagram. When a substation is a terminal station, the vacant adjacent substation is represented by a space " / ". Address GK3 corresponds to the installation location of the cross-regional switch, i.e., the substation to which the equipment belongs. GK2 and GK4 correspond to the codes of the left and right adjacent substations, respectively.

[0037] For example, the downlink cross-zone switch of substation C is numbered GK-X-BCD.

[0038] The specific numbers of each anchor section, DC circuit breaker, and cross-zone switch for single-sided power supply are as follows: Anchor segment numbering as follows Figure 8 As shown, the numbering principle is similar to that of the bilateral power supply method, except that the meanings of the substation codes corresponding to the coded addresses MD3, MD4, and MD5 are different. For a complete anchor segment set in a single-sided power supply zone, MD3 corresponds to the substation code during normal power supply, MD5 corresponds to the substation code during fault power supply, and MD4 is fixed as " / ".

[0039] For example, the downlink anchor sections set within the power supply zone between substation A and substation B are sequentially numbered as MD-X-2-A / B-1-Z, MD-X-2-A / B-1-Y, MD-X-2-A / B-2-Z, MD-X-2-A / B-2-Y..., ...MD-X-2-B / A-2-Z, MD-X-2-B / A-2-Y, MD-X-2-B / A-1-Z, MD-X-2-B / A-1-Y; the downlink left-side anchor sections set at the substation B outlet, bridging power supply zones B1, B3, and, in case of a fault, power supply zones A3 and C1, involve substations B, C, and D, and are numbered as MD-X-3-ABC-Z.

[0040] The numbering principle for DC feeder circuit breakers is the same as that for bilateral power supply.

[0041] Inter-zone switch numbering as follows Figure 9As shown, the numbering principle is similar to that of the bilateral power supply method, but since the cross-zone switch only involves two substations, the numbering is "GK-S / X-code of two substations crossing two power supply zones", corresponding to GK2 and GK3.

[0042] For example, the cross-zone switch installed in the downlink power supply zone between substation A and substation B is numbered GK-X-AB.

[0043] As a result, each device has a corresponding coded address attribute, establishing an intrinsic connection between them. Figure 3 , Figure 4 Each anchor section, DC circuit breaker, and cross-zone switch contains a corresponding code.

[0044] When a wire breakage fault occurs within a certain anchor section: When the power supply system is a dual-side power supply method: The line breakage detection device corresponding to the anchor section can determine that a line breakage fault has occurred in the anchor section.

[0045] The fault information is sent via the redundant GOOSE network within the institute to the fault partitioning device of the institute, indicating a disconnection fault with an anchor segment code.

[0046] If a line break occurs within the left portion of the second complete anchor segment between the downlink power supply zones of substations C and D, the line break detection device for that anchor segment will issue a line break fault message "DX{MD-X-2-C / D-2-Z}", where DX represents "line break fault" and MD-X-2-C / D-2-Z represents the corresponding anchor segment number. Anchor segment MD-X-2-C / D-2-Z is closer to substation C and is located within the redundant GOOSE network of substation C, thus sending the line break fault message "DX{MD-X-2-C / D-2-Z}" to the fault segment detection device of substation C.

[0047] If a line break fault occurs within the left anchor section of the downlink outlet of substation C, regardless of whether it is in the BC or CD power supply zone, the line break detection device for that anchor section will issue a line break fault message "DX{MD-X-3-BCD-Z}", where DX represents "line break fault" and MD-X-3-BCD-Z represents the corresponding anchor section number. The line break fault message "DX{MD-X-3-BCD-Z}" will be sent to the fault zone detection device of substation C.

[0048] The fault zone identification device extracts the anchor section type, uplink and downlink information, and substation information from the received line breakage fault information.

[0049] If the fault zone judgment device of substation C receives the "DX{MD-X-2-C / D-2-Z}" disconnection fault information issued by the disconnection judgment device of anchor section MD-X-2-C / D-2-Z, it means that MD1=X, MD2=2, MD3=C, MD4= / , MD5=D, and it can be determined that a disconnection fault has occurred in the left part of the second complete anchor section between the downlink power supply zones of substation C and substation D.

[0050] If the fault zone judgment device of substation C receives the "DX{MD-X-3-BCD-Z}" open circuit fault information from the open circuit judgment device of anchor section MD-X-3-BCD-Z, it means that MD1=X, MD2=3, MD3=B, MD4=C, MD5=D, and it can be determined that an open circuit fault has occurred in the left part of the anchor section at the outlet of the downlink power supply zone of substation C.

[0051] The fault zone judgment device, in conjunction with the collected status information of the cross-zone switch of this substation, determines the DC feeder circuit breaker that needs to be tripped within the power supply zone of this substation, and issues a tripping command to the DC feeder circuit breaker of this substation.

[0052] For anchor segments of type 2 (MD2=2): When the circuit breaker of this substation is in the open state: This substation only trips the DC feeder circuit breakers supplying power to the faulty section. Based on the relationship between the over-zone switch's coded address GK3 and the anchor section's coded address MD3 or MD5, the tripped circuit breaker's number is determined to be that of this substation. and neighboring places (When MD3=GK3) or our firm's and neighboring places (When MD5=GK3). The fault zone judgment device of this institute supplies power to the DC feeder circuit breaker. (When MD3=GK3) or (When MD5=GK3) Issue a trip command.

[0053] For example, if the fault information is “DX{MD-X-2-C / D-2-Z}”, and the downstream cross-zone switch (numbered GK-X-BCD) of substation C is in the open state, then GK3=MD3=C. Therefore, it is determined that the DC feeder circuit breaker DL-XC-CD (corresponding to C3) of substation C and the DC feeder circuit breaker DL-XD-CD (corresponding to D1) of the adjacent substation D have tripped. The fault zone judgment device of substation C issues a trip command to the DC feeder circuit breaker DL-XC-CD (corresponding to C3).

[0054] When the circuit breaker of this substation is in the closed state: Except for the tripping of the DC feeder circuit breaker supplying power to the faulty section. and Neighborhood (When MD3=GK3) or this firm and Neighborhood (When MD5=GK3) Except for (regardless of whether the DC feeder circuit breaker is in the open state, a trip command will be issued again), the DC feeder circuit breaker supplying power in the adjacent power supply zone connected to the cross-zone switch will also trip, that is, the DC feeder circuit breaker of this substation will trip. The DC feeder circuit breaker of the neighboring station tripped. (When MD3=GK3) or the DC feeder circuit breaker of this substation trips. The DC feeder circuit breaker of the neighboring station tripped. (When MD5=GK3). The fault zone judgment device of this institute supplies power to the DC feeder circuit breaker of this institute. , (When MD3=GK3) or , (When MD5=GK3) Issue a trip command.

[0055] For example, in the case of a line break fault message "DX{MD-X-2-C / D-2-Z}", when the downstream cross-zone switch (numbered GK-X-BCD) of substation C is in the closed state, GK3=MD3=C. Therefore, it is determined that in addition to the tripping of the DC feeder circuit breaker DL-XC-CD (corresponding to C3) of substation C and the DC feeder circuit breaker DL-XD-CD (corresponding to D1) of the adjacent substation D, the tripping of the DC feeder circuit breaker DL-XC-BC (corresponding to C1) of the adjacent power supply zone and the tripping of the DC feeder circuit breaker DL-XB-BC (corresponding to B3) of the adjacent substation also occurs. The fault zone judgment device of this substation issues a tripping command to the DC feeder circuit breakers DL-XC-CD (corresponding to C3) and DL-XC-BC (corresponding to C1) of this substation.

[0056] For anchor sections of type 3 at substation outlets (MD2=3): Regardless of the opening or closing status of the inter-zone switch, all four DC feeder circuit breakers in the two power supply zones connected by the inter-zone switch have tripped. The DC feeder circuit breakers of this substation have also tripped. and DC feeder circuit breaker of neighboring station and Tripping. The fault zone identification device of this substation sent a signal to the DC feeder circuit breaker of this substation. and Issue a trip command.

[0057] For example, if the fault information is "DX{MD-X-3-BCD-Z}", regardless of the status of the cross-zone switch in substation C, the DC feeder circuit breakers DL-XC-BC (corresponding to C1) and DL-XC-CD (corresponding to C3) in substation C, DL-XB-BC (corresponding to B3) in substation B, and DL-XD-CD (corresponding to D1) in substation D will trip. The fault zone determination device of this substation will issue a trip command to the DC feeder circuit breakers DL-XC-BC (corresponding to C1) and DL-XC-CD (corresponding to C3).

[0058] The fault zone identification device sends the line break fault information and the circuit breaker information that needs to be tripped to the corresponding substation's fault zone identification device via the inter-substation redundant GOOSE network.

[0059] For anchor segments of type 2 (MD2=2): When the circuit breaker of this substation is in the open state: If a line break fault message “DX{MD-X-2-C / D-2-Z}” occurs, the fault zone judgment device of substation C will send the line break information and the trip command of the DC feeder circuit breaker DL-XD-CD (corresponding to D1) of substation D to the fault zone judgment device of substation D.

[0060] When the circuit breaker of this substation is in the closed state: If a line break fault message “DX{MD-X-2-C / D-2-Z}” occurs, the fault zone judgment device of substation C will send the line break information and the trip commands of DC feeder circuit breaker DL-XB-BC (corresponding to B3) of substation B and DC feeder circuit breaker DL-XD-CD (corresponding to D1) of substation D to the fault zone judgment devices of substation B and substation D respectively.

[0061] For anchor sections of type 3 at substation outlets (MD2=3): If a line break fault message “DX{MD-X-3-BCD-Z}” occurs, the fault zone judgment device of substation C will send the line break information and the trip commands of DC feeder circuit breaker DL-XB-BC (corresponding to B3) of substation B and DC feeder circuit breaker DL-XD-CD (corresponding to D1) of substation D to the fault zone judgment devices of substation B and substation D respectively.

[0062] After receiving the line break fault information and the circuit breaker information that needs to be tripped from the inter-substation redundant GOOSE network, the fault zone judgment device sends a tripping command to the corresponding DC feeder circuit breaker. On the other hand, based on the received line break fault information, it extracts the anchor section type and uplink / downlink information, and combines it with the status information of the substation's cross-zone switches to determine the DC feeder circuit breaker that needs to be tripped within the substation's range.

[0063] When the circuit breaker of this substation is in the open state: The fault zone determination device only executes the information received from the tripped circuit breaker and issues a tripping command.

[0064] If the fault zone judgment device of substation D receives the line break fault information "DX{MD-X-2-C / D-2-Z}" and the tripping information of the DC feeder circuit breaker DL-XD-CD (corresponding to D1) of substation D from the fault zone judgment device of substation C, it will only execute the command to trip the DC feeder circuit breaker DL-XD-CD (corresponding to D1) of substation D when the downlink cross-zone switch (numbered GK-X-CDE) of substation D is in the open state.

[0065] When the circuit breaker of this substation is in the closed state: The fault zone determination device first executes the information received from the tripped circuit breaker and issues a tripping command.

[0066] Then, it is determined that the DC feeder circuit breaker supplying power to the adjacent power supply zone connected to the over-zone switch of this substation (the substation receiving the line break fault information at this time) has also tripped. The judgment logic is the same as the logic in Article 5 when the over-zone switch is in the closed state. That is, it is determined that the DC feeder circuit breaker of this substation... Helin DC feeder circuit breaker (When MD3=GK3) or the DC feeder circuit breaker of this institute Helin DC feeder circuit breaker (When MD5=GK3) it also trips. It should be noted that GK2, GK3, and GK4 here are the codes corresponding to the receiving substation. A trip command is then sent to the DC feeder circuit breaker of this substation.

[0067] If the fault zone judgment device of substation D receives the line break fault information "DX{MD-X-2-C / D-2-Z}" and the tripping information of the DC feeder circuit breaker DL-XD-CD (corresponding to D1) of substation D from the fault zone judgment device of substation C, and the downstream cross-zone switch (numbered GK-X-CDE) of substation D is in the closed state, it first executes the command to trip the DC feeder circuit breaker DL-XD-CD (corresponding to D1) of substation D. At this time, GK3=MD5=D, and it is determined that the DC feeder circuit breaker DL-XD-DE (corresponding to D3) of substation D and the DC feeder circuit breaker DL-XE-DE (corresponding to E1) of substation E have tripped. The fault zone judgment device of substation D then issues a tripping command to the DC feeder circuit breaker DL-XD-DE (corresponding to D3) of this substation.

[0068] The fault zone identification device sends the line break fault information and the circuit breaker information that needs to be tripped to the corresponding substation's fault zone identification device via the inter-substation redundant GOOSE network.

[0069] After receiving the line break fault information and the circuit breaker information that needs to be tripped from the inter-substation redundant GOOSE network, the fault zone judgment device sends a tripping command to the corresponding DC feeder circuit breaker. On the other hand, based on the received line break fault information, it extracts the anchor section type and uplink / downlink information, and combines it with the status information of the substation's cross-zone switches to determine the DC feeder circuit breaker that needs to be tripped within the substation's range.

[0070] The fault zone judgment device of substation D sends the disconnection information "DX{MD-X-2-C / D-2-Z}" and the trip command of the DC feeder circuit breaker DL-XE-DE (corresponding to E1) of substation E to the fault zone judgment device of substation E respectively.

[0071] If the fault zone judgment device of substation E receives the line break fault information "DX{MD-X-2-C / D-2-Z}" and the tripping information of the DC feeder circuit breaker DL-XE-DE (corresponding to E1) of substation E from the fault zone judgment device of substation D, it will only execute the command to trip the DC feeder circuit breaker DL-XE-DE (corresponding to E1) of substation E when the downlink cross-zone switch (numbered GK-X-DE) of substation E is in the open state.

[0072] When the power supply system is a single-sided power supply method: The line breakage detection device corresponding to the anchor section can determine that a line breakage fault has occurred in the anchor section.

[0073] In the same dual-side power supply mode, the fault information is sent via the redundant GOOSE network within the institute to the fault zone judgment device of the institute with a broken line fault information with anchor segment code.

[0074] If a line break fault occurs in the left portion of the second complete anchor segment within the downstream power supply zone B1 of substation B, the line break detection device for that anchor segment will issue a line break fault message "DX{MD-X-2-B / A-2-Z}", where DX represents "line break fault" and MD-X-2-B / A-2-Z represents the corresponding anchor segment number. The line break fault message "DX{MD-X-2-B / A-2-Z}" will be sent to the fault zone detection device of substation B.

[0075] If a line break fault occurs in the left portion of the anchor section within the substation B outlet, regardless of whether it is in the B3 or B1 power supply zone, the line break detection device for that anchor section will issue a line break fault message "DX{MD-X-3-ABC-Z", where DX represents "line break fault" and MD-X-3-ABC-Z represents the corresponding anchor section number. The line break fault message "DX{MD-X-3-ABC-Z}" will then be sent to the fault zone detection device of substation B.

[0076] In the same bilateral power supply mode, the fault zone judgment device extracts the anchor section type, uplink and downlink information and substation information from the received line breakage fault information.

[0077] If the fault zone judgment device of substation B receives the "DX{MD-X-2-B / A-2-Z}" disconnection fault information issued by the disconnection judgment device of anchor section MD-X-2-B / A-2-Z, it means that MD1=X, MD2=2, MD3=B, MD4= / , MD5=A, and it can be determined that a disconnection fault has occurred in the left part of the second complete anchor section in the downlink power supply zone B1 between substation B and substation A, which is powered by substation B.

[0078] If the fault zone judgment device of substation B receives the "DX{MD-X-3-ABC-Z}" open circuit fault information issued by the open circuit judgment device of anchor section MD-X-3-ABC-Z, it means that MD1=X, MD2=3, MD3=A, MD4=B, MD5=C, and it can be determined that the downlink left part of the anchor section of power supply zone AB and power supply zone BC connected at the outlet of substation B has an open circuit fault.

[0079] Similar to the dual-side power supply method, the fault zone judgment device, in conjunction with the status information of the cross-zone switch collected by the substation, determines the DC feeder circuit breaker that needs to be tripped within the power supply zone of the substation, and issues a tripping command to the DC feeder circuit breaker of the substation.

[0080] For anchor segments of type 2 (MD2=2): When the inter-zone switch is in the open state: This station only tripped the DC feeder circuit breaker supplying power to the faulty section. The circuit breaker number was determined to be... The fault zone identification device of this institute supplies power to the DC feeder circuit breaker. Issue a trip command.

[0081] For example, if the line break fault information is “DX{MD-X-2-B / A-2-Z}”, and the downstream cross-zone switch (numbered GK-X-AB) of substation A and substation B is in the open state, it is determined that the DC feeder circuit breaker DL-XB-AB (corresponding to B1) of substation B will trip. The fault zone judgment device of substation B issues a trip command to the DC feeder circuit breaker DL-XB-AB (corresponding to B1).

[0082] Under these conditions, the faulty partition has been removed. No further steps are required.

[0083] When the inter-zone switch is in the closed state: In addition to the DC feeder circuit breakers of this institute In addition to tripping (regardless of whether the DC feeder circuit breaker is in the open state, a tripping command will be issued again), the DC feeder circuit breaker in the adjacent power supply zone connected to the cross-zone switch will also be affected. It also tripped. The fault zone judgment device of this substation sent a signal to the DC feeder circuit breaker of this substation. Issue a trip command.

[0084] For example, if the line break fault information is “DX{MD-X-2-B / A-2-Z}”, when the downstream cross-zone switch (numbered GK-X-AB) of substation A and substation B is in the closed state, in addition to the tripping of the DC feeder circuit breaker DL-XB-AB (corresponding to B1) of substation B, the adjacent power supply zone DL-XA-AB (corresponding to A3) also trips. The fault zone judgment device of this substation issues a tripping command to the DC feeder circuit breaker DL-XB-AB (corresponding to B1) of this substation.

[0085] For anchor sections of type 3 at substation outlets (MD2=3): When both the left and right power supply zone cross-zone switches are in the open state: The two DC feeder circuit breakers connected to the two power supply zones of this unit and Tripping. The fault zone identification device of this substation sent a signal to the DC feeder circuit breaker of this substation. and Issue a trip command.

[0086] For example, in the case of a line break fault message “DX{MD-X-3-ABC-Z}”, when both the downlink cross-zone switches GK-X-AB and GK-X-BC of the left and right power supply zones are in the open state, the fault zone judgment device of substation B determines that the DC feeder circuit breakers DL-XB-AB (corresponding to B1) and DL-XB-BC (corresponding to B3) of substation B have tripped. The fault zone judgment device of this substation issues a trip command to the DC feeder circuit breakers DL-XB-AB (corresponding to B1) and DL-XB-BC (corresponding to B3) of this substation.

[0087] Under these conditions, the faulty partition has been removed. No further steps are required.

[0088] When the cross-zone switches of the left and right power supply zones are in the closed state: In addition to the DC feeder circuit breakers of this institute and In addition to tripping (regardless of whether the DC feeder circuit breaker is in the open state, a tripping command will be issued again), the DC feeder circuit breaker that supplies power to the adjacent power supply zone connected to the closed cross-zone switch will also be affected. ( (when closed) or ( It also trips when closed. The fault zone determination device in this unit sends a signal to the DC feeder circuit breaker. and Issue a trip command.

[0089] For example, if the fault information is “DX{MD-X-3-ABC-Z}”, and the cross-zone switches GK-X-AB or GK-X-BC of the left and right power supply zones are in the closed state, it is determined that in addition to the tripping of the DC feeder circuit breakers DL-XB-AB (corresponding to B1) and DL-XB-BC (corresponding to B3) of substation B, the adjacent power supply zone DL-XA-AB (corresponding to A3) or DL-XC-BC (corresponding to C1) will also trip. The fault zone judgment device of this substation issues a tripping command to the DC feeder circuit breakers DL-XB-AB (corresponding to B1) and DL-XB-BC (corresponding to B3).

[0090] The fault zone identification device sends the line break fault information and the circuit breaker information that needs to be tripped to the corresponding substation's fault zone identification device via the inter-substation redundant GOOSE network.

[0091] For anchor sections of type 2 (MD2=2): (This step and subsequent steps are only performed when the cross-zone switch within the fault power supply zone is in the closed state) If a line break fault message “DX{MD-X-2-B / A-2-Z}” occurs, the fault zone judgment device of substation B will send the line break information and the trip command of the DC feeder circuit breaker DL-XA-AB (corresponding to A3) of substation A to the fault zone judgment device of substation A.

[0092] For anchor sections of type 3 (substation outlet): (This step is executed only when the cross-zone switches of the left and right power supply zones are in the closed state, i.e., the subsequent steps) If a line break fault message “DX{MD-X-3-ABC-Z}” occurs, the fault zone judgment device of substation B will send the line break information and the trip command of the DC feeder circuit breaker DL-XA-AB (corresponding to A3) of substation A (when the cross-zone switch GK-X-AB is closed) or the DC feeder circuit breaker DL-XC-BC (corresponding to C1) of substation C (when the cross-zone switch GK-X-BC is closed) to the fault zone judgment device of substation A or substation C respectively.

[0093] After receiving the information about the circuit breaker that needs to be tripped from the inter-station redundant GOOSE network, the fault zone judgment device issues a tripping command to the corresponding DC feeder circuit breaker.

[0094] For anchor sections of type 2 (MD2=2): (This step is only performed when the cross-zone switch within the fault power supply zone is in the closed state) If the fault zone judgment device of substation A receives the line break fault information "DX{MD-X-2-A / B-2-Z}" and the tripping information of the DC feeder circuit breaker DL-XA-AB (corresponding to A3) of substation A from the fault zone judgment device of substation B, it executes the command to trip the DC feeder circuit breaker DL-XA-AB (corresponding to A3) of substation A.

[0095] For anchor sections of type 3 (substation outlet): (This step is performed only when the cross-zone switches of the left and right power supply zones are in the closed state) If the fault zone judgment device of substation A or substation C receives the line break fault information "DX{MD-X-3-ABC-Z}" sent by the fault zone judgment device of substation B and the tripping information of DC feeder circuit breaker DL-XA-AB (corresponding to A3) of substation A (when the cross-zone switch GK-X-AB is closed) or DC feeder circuit breaker DL-XC-BC (corresponding to C1) of substation C (when the cross-zone switch GK-X-BC is closed), it executes the command to trip DC feeder circuit breaker DL-XA-AB (corresponding to A3) of substation A or DC feeder circuit breaker DL-XC-BC (corresponding to C1) of substation C.

[0096] The present invention has been described in detail above through embodiments, but the content described is only an exemplary embodiment of the present invention and should not be considered as limiting the scope of the present invention. The scope of protection of the present invention is defined by the claims. Any technical solutions designed by those skilled in the art using the technical solutions described in the present invention, or similar technical solutions designed by those skilled in the art under the inspiration of the technical solutions of the present invention, within the substance and scope of protection of the present invention, to achieve the above-mentioned technical effects, or equivalent changes and improvements made to the scope of the application, should still fall within the patent protection scope of the present invention. It should be noted that, for clarity, descriptions of some components and processes that are not directly and obviously related to the scope of protection of the present invention but are known to those skilled in the art have been omitted in the description of the present invention.

Claims

1. A method for determining fault-free power supply zones based on substation coding, characterized in that, Includes the following: A wire breakage detection device is installed near the lower anchor column of the contact wire anchor section of the DC traction power supply system of electrified highways. The device determines whether a wire breakage has occurred by real-time monitoring of the physical parameters collected by the sensor installed on the weight of the lower anchor compensation device. Each substation is equipped with a redundant GOOSE switch and a fault zone detection device. In the case of single-sided power supply, each substation connects all the disconnection detection devices installed in its own power supply zone or in the case of double-sided power supply, the half power supply zone that is physically closer in the power supply zone of the substation to the redundant GOOSE switch in the substation, forming a redundant GOOSE network in the substation. The redundant GOOSE switches in all substations are connected to form a redundant GOOSE network between substations, realizing information sharing within and between substations. Each substation is coded sequentially, and then each anchor section, each feeder circuit breaker, and each cross-zone switch is coded based on the substation coding. After the disconnection detection device determines that the contact wire is disconnected, it sends the disconnection fault information, which includes the anchor section code, to the fault zone detection device it is connected to through the redundant GOOSE network within the station. The fault zone detection device that receives the disconnection fault information analyzes and determines the corresponding DC feeder circuit breaker based on the anchor section code information and the collected position status information of the cross-zone switch, and sends a trip command. The fault information of the contact network disconnection and the tripping information of the DC feeder circuit breaker are sent to the fault zone judgment device of the adjacent substation through the redundant GOOSE network between substations. The fault zone judgment device of the adjacent substation then further judges whether to send the tripping information to the DC feeder circuit breaker in its own substation based on the opening and closing information of the cross-zone switch. Finally, the contact network disconnection fault information and DC feeder circuit breaker tripping information of each anchor section of the entire line are shared.

2. The method according to claim 1, characterized in that, The anchor segment coding information includes "anchor segment identifier, uplink and downlink information, anchor segment type, anchor segment location information, anchor segment sequence number, and half-zone information within the anchor segment".

3. The method according to claim 2, characterized in that, When "Anchor Section Type" represents the code of an anchor section located at the substation exit that crosses power supply zones, the "Anchor Section Sequence Number" in the anchor section code information is omitted, and the "Anchor Section Location Information" is the code of the substation at the exit and three consecutive substations adjacent to it on both sides. For anchor sections located at the exits of substations at both ends of the line that cross power supply zones, the missing adjacent substations in the "Anchor Section Location Information" are represented by empty spaces " / ".

4. The method according to claim 2, characterized in that, The power supply system is a bidirectional power supply mode. When the "anchor segment type" represents the code of a complete anchor segment located within the power supply zone, the "anchor segment location information" in the anchor segment code information is the code of the substation on both sides of the power supply zone where the anchor segment is located, and a " / " is inserted between the two substation codes to indicate a blank space. In the anchor segment code information of a complete anchor segment located within the power supply zone at both ends of the line, the adjacent substation that is missing in the "anchor segment location information" is represented by a blank " / ".

5. The method according to claim 2, characterized in that, When the power supply system is a unidirectional power supply mode, and the "anchor segment type" represents the code of a complete anchor segment located within the power supply zone, the "anchor segment location information" in the anchor segment code information is the sequential arrangement of the substation code that supplies power to the power supply zone and the substation code that supplies power to the power supply zone on the other side of the cross-zone switch of the power supply zone, with a " / " inserted between the two substation codes to indicate a space.

6. The method according to claim 1, characterized in that, The coding information of the DC feeder circuit breaker includes "circuit breaker identifier, uplink and downlink information, substation code where the DC feeder circuit breaker is located, and substation codes on both sides of the power supply zone supplied by the DC feeder circuit breaker".

7. The method according to claim 1, characterized in that, When the power supply system is a bidirectional power supply mode, the cross-zone switch coding information includes "cross-zone switch identifier, up and down information, and the codes of the substation where the cross-zone switch is located and the three consecutive substations of the adjacent substations on both sides". The adjacent substations that are missing in the cross-zone switch coding information at both ends of the line are represented by the empty space " / ".

8. The method according to claim 1, characterized in that, When the power supply system is a unidirectional power supply mode, the cross-zone switch coding information includes "cross-zone switch identifier, up and down information, and substation codes on both sides of the cross-zone switch".

9. The method according to claim 1, characterized in that, When the cross-zone switch connected to the power supply zone with the open circuit fault is in the closed state, the fault zone judgment device of the substation that maintains electrical connection with the power supply zone with the open circuit fault sends a trip command to the DC feeder circuit breaker on the side of the closed cross-zone switch of that substation.

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