CN110994593A - DTU distribution method and system - Google Patents
DTU distribution method and system Download PDFInfo
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- CN110994593A CN110994593A CN201911133864.XA CN201911133864A CN110994593A CN 110994593 A CN110994593 A CN 110994593A CN 201911133864 A CN201911133864 A CN 201911133864A CN 110994593 A CN110994593 A CN 110994593A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000002955 isolation Methods 0.000 claims abstract description 32
- 241000272814 Anser sp. Species 0.000 claims abstract description 28
- 239000013307 optical fiber Substances 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims description 11
- 238000005192 partition Methods 0.000 claims description 5
- 230000006855 networking Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 5
- 125000006850 spacer group Chemical group 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a DTU distribution method and a DTU distribution system, wherein the DTU distribution method comprises the following steps: each switch on the distribution line is provided with a spacing unit; configuring a public unit for each area, and constructing a configuration-free GOOSE network through the public unit; a plurality of interval units in the same area are communicated with a public unit through a configuration-free GOOSE network, and interval units in adjacent areas are communicated through optical fibers; when the distribution line has a fault, the interval unit sends the detected fault information to the corresponding public unit, and the public unit determines a fault section and judges whether to execute fault isolation operation. The configuration-free GOOSE network is built through the public unit, plug and play of interval units in the same area are realized, a GOOSE protocol does not need to be configured one by one, and the construction time is shortened; the spacing units of adjacent areas are connected through optical fibers, so that wiring can be simplified, and the standardization degree is improved; the point protection and the surface protection of the distribution line can be combined by carrying out centralized processing on the fault information through the public unit.
Description
Technical Field
The invention relates to the technical field of distribution automation, in particular to a DTU distribution method and a DTU distribution system.
Background
In an electric power system, each switch on a Distribution line is generally configured with an interval Unit, the interval Unit is used for completing Terminal functions such as local measurement and control of each interval, and the interval units in the same area (for example, a switch station, a switching station or a ring main Unit) are connected with a station Terminal (DTU) so that Distribution automation of each interval is converged in the station Terminal to be realized. The traditional station terminal generally adopts a centralized structure of screen assembly installation, the interval units are connected with the station terminal through cables, wiring is complex, construction time is long, and each interval unit needs to be configured with a GOOSE protocol one by one, so that the standardization degree is low.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a DTU distribution method which can simplify wiring and shorten construction time.
The invention also provides a DTU distribution system.
According to the DTU distribution method of the embodiment of the first aspect of the invention, the method comprises the following steps:
each switch on the distribution line is provided with a spacing unit;
configuring a public unit for each area, and constructing a configuration-free GOOSE network through the public unit;
a plurality of interval units in the same area are communicated with the public unit through the configuration-free GOOSE network, and interval units in adjacent areas are communicated through optical fibers;
when the distribution line has a fault, the interval unit sends the detected fault information to the corresponding public unit, and the public unit determines a fault section and judges whether to execute fault isolation operation.
The DTU distribution method provided by the embodiment of the invention at least has the following beneficial effects:
the configuration-free GOOSE network is built through the public unit, plug and play of interval units in the same area can be realized, a GOOSE protocol does not need to be configured one by one, and the construction time is shortened; the spacing units of adjacent areas are connected through optical fibers, so that wiring can be simplified, the standardization degree is improved, and the signal transmission rate is improved; the point protection and the surface protection of the distribution line can be combined by carrying out centralized processing on the fault information through the public unit.
According to some embodiments of the present invention, configuring a common unit for each area, and building a configuration-free GOOSE network through the common unit specifically includes the following steps:
a plurality of interval units in the same area are configured with own switch types in advance;
a plurality of interval units are accessed to a common unit in the same area through a GOOSE switch;
a plurality of interval units send registration requests to a public unit in the same area;
the common unit of the same area receives and verifies the registration request.
According to some embodiments of the present invention, the receiving and verifying the registration request by the common unit in the same area specifically comprises the following steps:
the public unit detects whether the public unit is in a registration state, if so, the next step is executed, otherwise, the registration request is rejected;
detecting whether the sending time of the registration request is within the preset registration time, if so, executing the next step, and otherwise, rejecting the registration request;
and detecting whether the information of the registration request meets the requirement, if so, accepting the registration request, and otherwise, rejecting the registration request.
According to some embodiments of the invention, the information of the registration request comprises a multicast address of the destination public unit, a unique address APPID of the spacer unit itself, a MAC address of the spacer unit itself and a switch type.
According to some embodiments of the present invention, the determining, by the common unit, the fault section and the determining whether to perform the fault isolation operation specifically includes the following steps:
if one and only one interval unit in the same area sends the fault information to the public unit, the area is determined to be a fault section;
after the interval unit of the fault section successfully executes the fault isolation operation, a fault isolation success signal is sent to the public unit;
and after the common unit confirms that the switch in the fault section is tripped, the power supply recovery operation of reverse power supply is executed.
According to some embodiments of the invention, the power restoration operation of the back-powering comprises the steps of:
the common unit sends a power supply recovery signal to a corresponding interval unit in the same area in a GOOSE message mode;
the corresponding interval units in the same area transmit the power supply recovery signals to the interval units in the adjacent areas through optical fibers until the interval units associated with the interconnection switches receive the power supply recovery signals;
the interconnection switch performs closing operation, and the interval unit associated with the interconnection switch feeds back a switch failure or fault isolation success signal.
According to some embodiments of the present invention, the restored power signals within the same area include a switch type, a light differential fault signal, a node fault signal, a switch deactivation signal, a fault isolation success signal, and a node lockout signal.
According to some embodiments of the present invention, the restoration power signal delivered by the optical fiber includes a switch rejection signal and a fault isolation success signal.
According to a second aspect of the invention, a DTU distribution system comprises:
a spacing unit disposed at each switch of the distribution line;
the public units are distributed in different areas of the distribution line and used for carrying out fault signal processing and configuration-free networking;
the switches are distributed in different areas of the distribution line;
the plurality of interval units in the same area are connected with the switch and are connected with the public unit in the same area through the switch, and the interval units in adjacent areas are connected through optical fibers.
According to some embodiments of the invention, the partition unit, the common unit and the switch in the same area are integrally installed in the same DTU cabinet.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a DTU distribution method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a DTU distribution system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a trip logic of a DTU distribution system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
Referring to fig. 1, the present embodiment discloses a DTU distribution method, which includes the following steps:
each switch 300 on the distribution line is provided with one spacing unit 100;
configuring a public unit 200 in each area, and building a configuration-free GOOSE network through the public unit 200;
a plurality of interval units 100 in the same area communicate with the public unit 200 through a configuration-free GOOSE network, and interval units 100 in adjacent areas communicate through optical fibers 400;
when a fault occurs in the distribution line, the bay unit 100 transmits the detected fault information to the corresponding utility unit 200, and the utility unit 200 determines a fault section and determines whether to perform a fault isolation operation.
The public unit 200 is used for building a configuration-free GOOSE network, so that plug and play of the interval units 100 in the same area can be realized, a GOOSE protocol does not need to be configured one by one, and the construction time is shortened; the adjacent partition units 100 are connected through the optical fiber 400, so that wiring can be simplified, the standardization degree can be improved, and the signal transmission rate can be improved; the point protection and the surface protection of the distribution line can be combined by the centralized processing of the fault information through the public unit 200, wherein the point protection is the monitoring and the protection of the corresponding switch by the interval unit 100, and the surface protection is the centralized processing of the fault signals of the interval units 100 in the same area through the public unit 200, so that the monitoring and the protection of the areas are realized.
Specifically, configuring one common unit 200 for each area, and building a configuration-free GOOSE network through the common unit 200 specifically includes the following steps:
a plurality of interval units 100 in the same area are configured with their own switch types in advance, wherein the switch types comprise a section switch, a tie switch, a first switch and a last switch;
a plurality of interval units 100 are connected to a common unit 200 in the same area through a GOOSE switch;
the plurality of bay units 100 send registration requests to the common unit 200 in the same area;
the common unit 200 of the same area receives and verifies the registration request.
The steps of receiving and verifying the registration request by the public unit 200 in the same area specifically include:
the public unit 200 detects whether the public unit is in a registration state, if so, the next step is executed, otherwise, the registration request is rejected;
detecting whether the sending time of the registration request is within the preset registration time, if so, executing the next step, otherwise, rejecting the registration request, wherein the preset registration time can be 5 seconds, 10 seconds or 15 seconds;
and detecting whether the information of the registration request meets the requirement, if so, accepting the registration request, and otherwise, rejecting the registration request.
The public unit 200 can enter a registration state by triggering a key or receiving a remote control signal, and accept a registration request within a preset registration time, thereby facilitating network management and improving network stability.
The information of the registration request includes the multicast address of the destination common unit 200, the unique address APPID of the spacer unit 100 itself, the MAC address of the spacer unit 100 itself, and the switch type, so that the common unit 200 can identify each spacer unit 100, and can communicate with each spacer unit 100.
Specifically, the determining, by the common unit 200, the fault section and the judging whether to execute the fault isolation operation specifically includes the following steps:
if one and only one interval unit 100 in the same area sends fault information to the public unit 200, the area is determined to be a fault section;
after the interval unit 100 of the fault section successfully executes the fault isolation operation, a fault isolation success signal is sent to the public unit 200;
the common unit 200 performs a power restoration operation of the reverse power supply after confirming that the switch in the failed section is tripped.
The power supply recovery operation of the reverse power supply comprises the following steps:
the common unit 200 sends the power supply recovery signal to the corresponding interval unit 100 in the same area in a GOOSE message manner;
the corresponding spacer units 100 in the same area transmit the power supply restoration signal to the spacer units 100 in the adjacent areas through the optical fiber 400 until the spacer units 100 associated with the tie switch receive the power supply restoration signal;
the tie switch performs a closing operation and the spacer unit 100 associated with the tie switch feeds back a switch failure or fault isolation success signal.
The power supply recovery signals in the same area comprise a switch type, an optical difference fault signal, a node fault signal, a switch operation rejection signal, a fault isolation success signal and a node blocking signal.
The restoration power signals delivered by fiber 400 include a switch failure signal and a fault isolation success signal.
Referring to fig. 2 and fig. 3, the following describes in detail the combination of the point protection and the area protection of the DTU distribution method according to the present embodiment through the trip logic of the present embodiment:
f1, substation outlet fault: the first switch CB201 is subjected to voltage loss and delayed opening, the spacing unit 100 associated with the first switch CB201 sends a fault isolation success signal, the fault isolation success signal is transmitted to the spacing unit 100 associated with the section switch CB202 through the optical fiber 400, the spacing unit 100 associated with the section switch CB202 sends the fault isolation success signal to the public unit 200 through the configuration-free GOOSE network, the public unit 200 sends the fault isolation success signal to the spacing unit 100 associated with the section switch CB206 through the configuration-free GOOSE network, and the fault isolation success signal is transmitted to the spacing unit 100 associated with the tie switch CB304 step by step in such a way, so that the tie switch CB304 is subjected to switching to supply power;
f2, bus fault in station: the public unit 200 detects a node fault signal of the section switch CB102, other nodes have no fault, a fault isolation signal is sent after a signal collection time of less than 20ms is waited, all switches (CB102, CB103, CB104, CB105 and CB106) on a bus are tripped, and after the fault isolation is successful, the public unit 200 is transmitted to a tie switch CB304 step by step through an optical fiber 400 and a configuration-free GOOSEE network to carry out switching on and power supply;
f3, line fault between stations: the interval unit 100 associated with the section switch CB206 and the section switch CB207 detects a differential signal by using an optical fiber differential protection principle, then the section switch CB206 and the section switch CB207 automatically trip, and sends an optical differential fault signal and a fault isolation success signal to the public unit 200, and the public unit 200 transfers the optical differential fault signal and the fault isolation success signal to a CB303 contact switch step by step through a non-configuration GOOSE network and an optical fiber 400 to perform switching-on and power supply;
f4, line fault between stations: similar to the case of the F3 failure point;
f5, demarcation line fault: the fault is isolated by itself after the fault occurs in the end switch CB210, and the interval unit 100 associated with the end switch CB210 sends a blocking signal to the common unit 200.
F6, line fault near contact: the separation unit 100 related to the section switch CB111 and the tie switch CB304 enables the section switch CB111 and the tie switch CB304 to trip automatically after detecting a differential signal by using an optical fiber differential protection principle, and sends an optical differential fault signal and a fault isolation success signal to the public unit 200, and the public unit 200 enables the tie switch CB304 to be closed by locking through a configuration-free GOOSE network and an optical fiber 400.
Referring to fig. 2, according to an embodiment of the present invention, a DTU distribution system is further disclosed, which includes a spacing unit 100, a public unit 200 and a switch (not shown), wherein the spacing unit 100 is configured at each switch 300 of a distribution line; the public units 200 are distributed in different areas of the distribution line, and the public units 200 are used for fault signal processing and configuration-free networking; the switches are distributed in different areas of the distribution line; the plurality of partition units 100 in the same area are connected to the switch and connected to the common unit 200 in the same area through the switch, and the partition units 100 in adjacent areas are connected through the optical fiber 400.
The interval unit 100, the public unit 200 and the switch in the same area are integrally installed in the same DTU cabinet.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A DTU distribution method is characterized by comprising the following steps:
each switch on the distribution line is provided with a spacing unit;
configuring a public unit for each area, and constructing a configuration-free GOOSE network through the public unit;
a plurality of interval units in the same area are communicated with the public unit through the configuration-free GOOSE network, and interval units in adjacent areas are communicated through optical fibers;
when the distribution line has a fault, the interval unit sends the detected fault information to the corresponding public unit, and the public unit determines a fault section and judges whether to execute fault isolation operation.
2. The DTU distribution method of claim 1, wherein each area is configured with a common unit, and the building of a configuration-free GOOSE network through the common units specifically comprises the following steps:
a plurality of interval units in the same area are configured with own switch types in advance;
a plurality of interval units are accessed to a common unit in the same area through a GOOSE switch;
a plurality of interval units send registration requests to a public unit in the same area;
the common unit of the same area receives and verifies the registration request.
3. The DTU distribution method of claim 2, wherein the step of receiving and verifying the registration request by the common unit in the same area specifically comprises the steps of:
the public unit detects whether the public unit is in a registration state, if so, the next step is executed, otherwise, the registration request is rejected;
detecting whether the sending time of the registration request is within the preset registration time, if so, executing the next step, and otherwise, rejecting the registration request;
and detecting whether the information of the registration request meets the requirement, if so, accepting the registration request, and otherwise, rejecting the registration request.
4. The DTU distribution method according to claim 3, wherein the information of the registration request includes a multicast address of the destination common unit, a unique address APPID of the interval unit itself, a MAC address of the interval unit itself, and a switch type.
5. The DTU distribution method of claim 1, wherein the determining the fault section and determining whether to perform the fault isolation operation by the common unit comprises:
if one and only one interval unit in the same area sends the fault information to the public unit, the area is determined to be a fault section;
after the interval unit of the fault section successfully executes the fault isolation operation, a fault isolation success signal is sent to the public unit;
and after the common unit confirms that the switch in the fault section is tripped, the power supply recovery operation of reverse power supply is executed.
6. The DTU distribution method of claim 5, wherein the back-powering restore operation comprises the steps of:
the common unit sends a power supply recovery signal to a corresponding interval unit in the same area in a GOOSE message mode;
the corresponding interval units in the same area transmit the power supply recovery signals to the interval units in the adjacent areas through optical fibers until the interval units associated with the interconnection switches receive the power supply recovery signals;
the interconnection switch performs closing operation, and the interval unit associated with the interconnection switch feeds back a switch failure or fault isolation success signal.
7. The DTU distribution method of claim 6, wherein the restored power signals in the same area include a switch type, a light differential fault signal, a node fault signal, a switch rejection signal, a fault isolation success signal, and a node lockout signal.
8. The DTU distribution method of claim 6, wherein the restoration power signals conveyed by the optical fiber include a switch rejection signal and a fault isolation success signal.
9. A DTU distribution system, comprising:
a spacing unit disposed at each switch of the distribution line;
the public units are distributed in different areas of the distribution line and used for carrying out fault signal processing and configuration-free networking;
the switches are distributed in different areas of the distribution line;
the plurality of interval units in the same area are connected with the switch and are connected with the public unit in the same area through the switch, and the interval units in adjacent areas are connected through optical fibers.
10. The DTU distribution system of claim 9, wherein the partition unit, the common unit, and the switch in the same area are integrally installed in the same DTU cabinet.
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| CN201911133864.XA CN110994593A (en) | 2019-11-19 | 2019-11-19 | DTU distribution method and system |
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| CN112865035B (en) * | 2021-01-19 | 2023-03-03 | 南方电网科学研究院有限责任公司 | Multicast communication-based line fault self-healing method and device |
| CN116054936A (en) * | 2022-12-29 | 2023-05-02 | 中国铁建电气化局集团有限公司 | Optical fiber fault real-time monitoring device, monitoring method and device |
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