CN204721094U - A kind of Substation Communication System - Google Patents
A kind of Substation Communication System Download PDFInfo
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- CN204721094U CN204721094U CN201520456757.1U CN201520456757U CN204721094U CN 204721094 U CN204721094 U CN 204721094U CN 201520456757 U CN201520456757 U CN 201520456757U CN 204721094 U CN204721094 U CN 204721094U
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- 238000004891 communication Methods 0.000 title claims abstract description 179
- 238000003745 diagnosis Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 17
- 230000006870 function Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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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
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Abstract
This application discloses a kind of Substation Communication System, comprising: the first communication port, second communication passage, first from ring apparatus and second from ring apparatus; Wherein, the first communication port comprises: the outer device of device in first stop, first stop and connect the first communication line of the device outward of device and first stop in first stop; Second communication passage comprises: the outer device of device in second station, second station and connect the second communication circuit of the device outward of device and second station in second station; First is connected by the outer device of the first communication line and first stop from ring apparatus; And first is connected with device in second station from ring apparatus, in the first operative state, first is used for device in first stop from ring from ring apparatus; Second is connected by the outer device of second communication circuit and second station from ring apparatus, and second is connected with device in first stop from ring apparatus, and in a second operative state, second is used for device in second station from ring from ring apparatus.The application achieves the quick diagnosis that outage detects.
Description
Technical field
The utility model relates to technical field of power system communication, in particular, relates to a kind of Substation Communication System.
Background technology
Along with the development of computer technology, computing capability improves, and the automation of transformation substations also constantly promotes technically, and the aspect contained is also more and more wider.The responsibility that in standing, communication system is born is also more and more great, and the consequence that in standing, telecontrol communication interrupts producing is day by day serious.
At present when communication system generation outage, must carry out detecting from ring experiment confirming that outage occurs in station or outside station to scene by maintainer, and then notify that the staff of Xintong Co processes, which increase number of times of going to work, reduce operating efficiency.
Utility model content
For solving the problem, the utility model provides a kind of Substation Communication System, and by self-loop function, this Substation Communication System can confirm that communication failure occurs in station or outside station, achieve the quick diagnosis that outage detects, improve operating efficiency.
To achieve these goals, the utility model provides following technical scheme:
A kind of Substation Communication System, this Substation Communication System comprises: the first communication port, second communication passage, first from ring apparatus and second from ring apparatus; Wherein,
Described first communication port comprises: the outer device of device in first stop, first stop and connect the first communication line of the device outward of device and described first stop in described first stop;
Described second communication passage comprises: the outer device of device in second station, second station and connect the second communication circuit of the device outward of device and described second station in described second station;
Described first is connected by the outer device of described first communication line and described first stop from ring apparatus; And described first is connected with device in described second station from ring apparatus, in the first operative state, described first is used for device in described first stop from ring from ring apparatus;
Described second is connected by the outer device of described second communication circuit and described second station from ring apparatus, and described second is connected with device in described first stop from ring apparatus, in a second operative state, described second is used for device in described second station from ring from ring apparatus.
Preferably, in above-mentioned communication system, described first communication port is 101 communication ports of employing 101 stipulations;
Described second communication passage is 104 communication ports of employing 104 stipulations.
Preferably, in above-mentioned communication system, in described first stop, device comprises: the first switch connected successively, the first telecontrol communication machine and modulator-demodulator;
Described first communication line comprises: the voice distribution frame be connected with described modulator-demodulator by the first data feedback channel and the first down going channel; The first dispatching terminal be connected with described voice distribution frame.
Preferably, in above-mentioned communication system, described first data feedback channel and described first down going channel include two parallel sub-channels;
One sub-channels of described first data feedback channel docks with a sub-channels of described first down going channel; Another sub-channels of described first data feedback channel docks with another sub-channels of described first down going channel.
Preferably, in above-mentioned communication system, in described second station, device comprises: the second switch connected successively, the second telecontrol communication machine, real-time exchange machine and router;
Described second communication circuit comprises: the traffic patch bay be connected with described router by the second data feedback channel and the second down going channel; The second dispatch terminal be connected with described traffic patch bay.
Preferably, in above-mentioned communication system, described first is connected with described second telecontrol communication machine from ring apparatus one end, and the other end is connected with the outer device of described first stop by described first data feedback channel and described first down going channel.
Preferably, in above-mentioned communication system, described second is connected with described first telecontrol communication machine from ring apparatus one end, and the other end is connected with the outer device of described second station by described second data feedback channel and described second down going channel.
Preferably, in above-mentioned communication system, described first comprises from ring apparatus: for being received from the receiver module of fourth finger order; Described from fourth finger order for performing, carry out the Executive Module controlled from ring; For the power module that described receiver module and described Executive Module are powered.
Preferably, in above-mentioned communication system, described second is identical from ring apparatus structure with described first from ring apparatus.
Known by foregoing description, the Substation Communication System that the utility model provides comprises: the first communication port, second communication passage, first from ring apparatus and second from ring apparatus; Wherein, described first communication port comprises: the outer device of device in first stop, first stop and connect the first communication line of the device outward of device and described first stop in described first stop; Described second communication passage comprises: the outer device of device in second station, second station and connect the second communication circuit of the device outward of device and described second station in described second station; Described first is connected by the outer device of described first communication line and described first stop from ring apparatus; And described first is connected with device in described second station from ring apparatus, in the first operative state, described first is used for device in described first stop from ring from ring apparatus; Described second is connected by the outer device of described second communication circuit and described second station from ring apparatus, and described second is connected with device in described first stop from ring apparatus, in a second operative state, described second is used for device in described second station from ring from ring apparatus.
When there is communication disruption fault in any one in described first communication port and described second communication passage, control to occur the station equipment of communication port of outage from ring by correspondence from ring apparatus, can device in station is in still stand outer device during position according to this communication port generation outage of packet sending and receiving state confirmation of device outside the station of this communication port after ring, on-the-spot from ring experiment test without the need to manually carrying out, achieve the quick diagnosis that outage detects, improve operating efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The structural representation of a kind of Substation Communication System that Fig. 1 provides for the embodiment of the present application;
The structural representation of the another kind of Substation Communication System that Fig. 2 provides for the embodiment of the present application;
Fig. 3 for the embodiment of the present application provide a kind of first from the structural representation of ring apparatus.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
With reference to the structural representation of a kind of Substation Communication System that figure 1, Fig. 1 provides for the embodiment of the present application, this Substation Communication System.
First communication port comprises: the outer device 11 of device 12 in first stop, first stop and connect the first communication line 13 of device 12 and the outer device 11 of first stop in first stop.
Second communication passage comprises: the outer device 14 of device 15 in second station, second station and connect the second communication circuit 16 of device 15 and the outer device 14 of second station in second station.
First is connected by the outer device 11 of the first communication line 13 and first stop from ring apparatus 17; And first is connected with device in second station 15 from ring apparatus 17, in the first operative state, first from ring apparatus 17 for by device in first stop 12 from ring.
First operating state is that second communication tunneling traffic is normal, state during the first communication port generation communication disruption fault.Under first operating state, due to communication disruption, outer device 11 message of first stop is abnormal.Now, in second station, device 15 sends first from ring driving instruction and the first test packet signal to first from ring apparatus 17, and first controls first stop in device 12 from ring according to first from ring driving instruction from ring apparatus 17.
If the outer device 11 of first stop can receive this first test packet signal, then illustrate and communicate normally by the outer device 11 of the first communication line 13 and first stop, the outage of the first communication port occurs in device 12 in first stop, and namely outage occurs in station.
Otherwise, if the outer device 11 of first stop cannot receive this first test packet signal, then prove to communicate abnormal by the outer device 11 of the first communication line 13 and first stop, illustrate that the first test packet signal does not transmit by the first communication line 13 and the outer device 11 of first stop, outage is there is by the communication port part of device 11 outside the first communication line 13 to first stop, can judge that communication disruption fault occurs in the first communication line 13 outside station, or the outer device 11 of first stop, or, namely can judge that communication disruption fault occurs in outside station therebetween.
Second is connected by the outer device 14 of second communication circuit 16 and second station from ring apparatus 18, and second is connected with device in first stop 12 from ring apparatus 18, in a second operative state, second from ring apparatus 18 for by device in second station 15 from ring.
Second operating state is that the first communication port communication is normal, state during second communication passage generation communication disruption fault.Under second operating state, due to communication disruption, outer device 14 message of second station is abnormal.Now, in first stop, device 12 sends second from ring driving instruction and the second test packet signal to second from ring apparatus 18, and second controls second station in device 15 from ring according to second from ring driving instruction from ring apparatus 18.
If the outer device 14 of second station can receive this second test packet signal, then illustrate and communicate normally by the outer device 14 of second communication circuit 16 and second station, the outage of second communication passage occurs in device 15 in second station, and namely outage occurs in station.
Otherwise, if the outer device 14 of second station cannot receive this second test packet signal, then prove to communicate abnormal by the outer device 14 of second communication circuit 16 and second station, illustrate that the second test packet signal does not transmit by second communication circuit 16 and the outer device 14 of second station, outage is there is by the communication port part of device 14 outside second communication circuit 16 to second station, can judge that communication disruption fault occurs in the second communication circuit 16 outside station, or the outer device 14 of second station, or, namely can judge that communication disruption fault occurs in outside station therebetween.
In the embodiment of the present application, described is that short circuit is arranged from ring, and namely device in first stop 12 is by device in first stop 12 short circuit from ring from ring apparatus 17 by first, and device in second station 15 is by device in second station 15 short circuit from ring from ring apparatus 18 by second.The station equipment of the communication port of communication disruption fault will be there is from ring by correspondence from ring apparatus, can judge that outage occurs in station or outside station fast.
When the first operating state, if it is determined that the station external memory of the first communication port is disconnected fault in the communications, in order to determine the first communication port further station in whether there is communication disruption fault simultaneously, now, second can also be sent from ring driving instruction and the second test packet signal to second from ring apparatus 18 by device in first stop 12, if the outer device 14 of second station can receive the second test packet signal, then illustrate that in first stop, device 12 communicates normally, namely there is not the communication disruption fault in station in the first communication port, if the outer device 14 of second station cannot receive the second test packet signal, then illustrate that in first stop, device 12 also has communication disruption fault, namely illustrate that the first communication port has in station and the outer communication disruption fault in station simultaneously.
When the second operating state, if it is determined that the station external memory of second communication passage is disconnected fault in the communications, in order to determine second communication passage further station in whether there is communication disruption fault simultaneously, now, first can also be sent from ring driving instruction and the first test packet signal to first from ring apparatus 17 by device in second station 15, if the outer device 11 of first stop can receive the first test packet signal, then illustrate that in second station, device 15 communicates normally, namely there is not the communication disruption fault in station in second communication passage, if the outer device 11 of first stop cannot receive the first test packet signal, then illustrate that in second station, device 15 also has communication disruption fault, namely illustrate that second communication passage has in station and the outer communication disruption fault in station simultaneously.
With reference to the structural representation of the another kind of Substation Communication System that figure 2, Fig. 2 provides for the embodiment of the present application, in the exemplary embodiment illustrated in fig. 2, the first communication port is 101 communication ports of employing 101 stipulations.Second communication passage is 104 communication ports of employing 104 stipulations.
In first stop, device 21 comprises: the first switch 211, first telecontrol communication machine 212 and the modulator-demodulator 213 connected successively.First communication line 22 comprises: the voice distribution frame 221 be connected with modulator-demodulator 213 by the first data feedback channel and the first down going channel; The first dispatching terminal 222 be connected with voice distribution frame 221.
In second station, device 23 comprises: the second switch 231, second telecontrol communication machine 232, real-time exchange machine 233 and the router two 34 that connect successively.Second communication circuit 24 comprises: by the second data feedback channel 5. and the traffic patch bay 241 that is 6. connected with router two 34 of the second down going channel; The second dispatch terminal 242 be connected with traffic patch bay 241.
Transceiving data is tested for the ease of the first dispatching terminal 222, first data feedback channel and the first down going channel include two parallel sub-channels, 3. 1. one sub-channels of the first data feedback channel dock with a sub-channels of the first down going channel, and 4. 2. another sub-channels of the first data feedback channel dock with another sub-channels of the first down going channel.Can be docked by switch between corresponding subchannel.
Test transceiving data for the ease of the second dispatching terminal 242,6. 5. the second data feedback channel dock with the second down going channel.6. 5. second data feedback channel can be achieved a butt joint by switch with the second down going channel.
First is connected with the second telecontrol communication machine 232 from ring apparatus 25 one end, and the other end is connected with the outer device 22 of first stop by the first data feedback channel and the first down going channel.
Second is connected with the first telecontrol communication machine 212 from ring apparatus 26 one end, and 6. 5. the other end be connected with device 24 outside second station with the second down going channel by the second data feedback channel.
When fault occurs in fault point C, main website end by under 104 passages from ring order to the second telecontrol communication machine 231, second telecontrol communication machine 231 send first from ring driving instruction to first from ring apparatus 25, by passage from ring.Now main website end will be that transmitting-receiving is normal, and message is correct, and failure judgement occurs in the station of the first communication port.Main website end is the main electrical power plant comprising the first dispatching terminal and the second dispatching terminal.The power station comprising device in device in first stop and second station is the plant stand be scheduled.
When fault occurs in fault point D, main website end by under 101 passages from ring order to the first telecontrol communication machine 211, first telecontrol communication machine 211 send second from ring driving instruction to second from ring apparatus 26, by passage from ring.Now main website end will be receive and dispatch still extremely, not have message, outside failure judgement is stood.
In the embodiment of the present application, in standing and station is outer all refers to that communication disruption fault occurs in plant stand or outside plant stand.
With reference to figure 3, Fig. 3 for the embodiment of the present application provide a kind of first from the structural representation of ring apparatus, first comprises from ring apparatus 25: for being received from the receiver module 31 of fourth finger order; For performing from fourth finger order, carry out the Executive Module 32 controlled from ring; For the power module 33 that receiver module 31 and Executive Module 32 are powered.
For first from ring apparatus 25, its receiving terminal A is used for being connected with the second telecontrol communication machine 232, and for receiving the first closed loop instruction and the second test packet signal of the second telecontrol communication machine 232 transmission, its transmitting terminal B is used for being connected with the first communication line 22.
Second is identical from the structure of ring apparatus with first from ring apparatus, comprises equally: for being received from the receiver module of fourth finger order; For performing from fourth finger order, in control second station, device is from the Executive Module of ring; For the power module that receiver module and Executive Module are powered.
In the embodiment of the present application, receiver module can receive and understand that corresponding telecontrol communication machine sends 103, order in the station such as MMS in protocol massages.In first stop, in device and second station, device all has from ring status and normal operating condition two states, and close for often opening node from ring status, normally closed node disconnects.Normal operating condition disconnects for often opening node, and normally closed node closes.In standing, device is sent by corresponding telecontrol communication machine and carries out state switching from ring driving instruction and recovery order.
Command execution module by one with multiplely often opening, the two-position relay of normally closed node forms, its normally closed auxiliary node serial connection is to corresponding telecontrol communication machine, often auxiliary node be will open and corresponding data feedback channel and down going channel be connected to, receiver module from ring driving instruction or will recover the order deciphering driving actuating of relay, involution, carry out state switching.
Power module has the function of voltage stabilizing, alternating current-direct current self adaptation and power supply DC110/220 compatibility.
First in station, corresponding remote controlled point should be increased in telecontrol communication machine before ring apparatus uses, turn outer device and also increase corresponding remote controlled point, improve end remote control interface.Remote control mode is consistent with conventional remote, need with telemechanical, redo after ring apparatus does associated communication: preset-to return to school-to perform.
The station level network configuration of two net being used in from ring apparatus, adjusting as economized in 220kV transformer station, adjust two-way access, two-way can remote control or stand interior 101 passages, the mutual remote control of 104 passage mutually.
In the embodiment of the present application, voice distribution frame is for realizing the function such as connection, distribution, line transfer, switching of tone frequency channel wire in 101 passages and communication line.Modulator-demodulator is used for analog signal to translate into the discernible digital signal of computer (in 101 passages, data pass through analog signal transmission), realizes telecontrol communication machine and main website end device talk in station.Telecontrol communication machine is used for main website end signal modulation to download, and realizes the functions such as remote measurement, remote signalling, remote control, remote regulating.Communication wiring frame is for realizing the function such as connection, distribution line transfer, switching of the outer connection of 2M line and station in the station in 104 passages.Router is used for the data message between heterogeneous networks or the network segment to be carried out " translation ", with the data enabling their mutual " reading " understand the other side, realizes telecontrol communication machine and main website end device talk in station.
Known by foregoing description, Substation Communication System described in the embodiment of the present application can realize the fast detecting of communication failure in communication port, improves operating efficiency.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a Substation Communication System, is characterized in that, comprising: the first communication port, second communication passage, first from ring apparatus and second from ring apparatus; Wherein,
Described first communication port comprises: the outer device of device in first stop, first stop and connect the first communication line of the device outward of device and described first stop in described first stop;
Described second communication passage comprises: the outer device of device in second station, second station and connect the second communication circuit of the device outward of device and described second station in described second station;
Described first is connected by the outer device of described first communication line and described first stop from ring apparatus; And described first is connected with device in described second station from ring apparatus, in the first operative state, described first is used for device in described first stop from ring from ring apparatus;
Described second is connected by the outer device of described second communication circuit and described second station from ring apparatus, and described second is connected with device in described first stop from ring apparatus, in a second operative state, described second is used for device in described second station from ring from ring apparatus.
2. Substation Communication System according to claim 1, is characterized in that, described first communication port is 101 communication ports of employing 101 stipulations;
Described second communication passage is 104 communication ports of employing 104 stipulations.
3. Substation Communication System according to claim 2, is characterized in that, in described first stop, device comprises: the first switch connected successively, the first telecontrol communication machine and modulator-demodulator;
Described first communication line comprises: the voice distribution frame be connected with described modulator-demodulator by the first data feedback channel and the first down going channel; The first dispatching terminal be connected with described voice distribution frame.
4. Substation Communication System according to claim 3, is characterized in that, described first data feedback channel and described first down going channel include two parallel sub-channels;
One sub-channels of described first data feedback channel docks with a sub-channels of described first down going channel; Another sub-channels of described first data feedback channel docks with another sub-channels of described first down going channel.
5. Substation Communication System according to claim 3, is characterized in that, in described second station, device comprises: the second switch connected successively, the second telecontrol communication machine, real-time exchange machine and router;
Described second communication circuit comprises: the traffic patch bay be connected with described router by the second data feedback channel and the second down going channel; The second dispatch terminal be connected with described traffic patch bay.
6. Substation Communication System according to claim 5, is characterized in that, described first is connected with described second telecontrol communication machine from ring apparatus one end, and the other end is connected with the outer device of described first stop by described first data feedback channel and described first down going channel.
7. Substation Communication System according to claim 5, is characterized in that, described second is connected with described first telecontrol communication machine from ring apparatus one end, and the other end is connected with the outer device of described second station by described second data feedback channel and described second down going channel.
8. the Substation Communication System according to any one of claim 1-7, is characterized in that, described first comprises from ring apparatus: for being received from the receiver module of fourth finger order; Described from fourth finger order for performing, carry out the Executive Module controlled from ring; For the power module that described receiver module and described Executive Module are powered.
9. the Substation Communication System according to any one of claim 1-7, is characterized in that, described second is identical from the structure of ring apparatus with described first from ring apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520456757.1U CN204721094U (en) | 2015-06-29 | 2015-06-29 | A kind of Substation Communication System |
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| CN201520456757.1U CN204721094U (en) | 2015-06-29 | 2015-06-29 | A kind of Substation Communication System |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901427A (en) * | 2015-06-29 | 2015-09-09 | 国家电网公司 | Substation communication system |
| CN108614479A (en) * | 2018-04-23 | 2018-10-02 | 国网天津市电力公司电力科学研究院 | A kind of communication port having automatic switching function is from loop device |
-
2015
- 2015-06-29 CN CN201520456757.1U patent/CN204721094U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901427A (en) * | 2015-06-29 | 2015-09-09 | 国家电网公司 | Substation communication system |
| CN108614479A (en) * | 2018-04-23 | 2018-10-02 | 国网天津市电力公司电力科学研究院 | A kind of communication port having automatic switching function is from loop device |
| CN108614479B (en) * | 2018-04-23 | 2021-07-23 | 国网天津市电力公司电力科学研究院 | Communication channel self-loop device with automatic switching function |
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