CN205195707U - Harmless auto -change over device of 2M optic fibre - Google Patents
Harmless auto -change over device of 2M optic fibre Download PDFInfo
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- CN205195707U CN205195707U CN201520618560.3U CN201520618560U CN205195707U CN 205195707 U CN205195707 U CN 205195707U CN 201520618560 U CN201520618560 U CN 201520618560U CN 205195707 U CN205195707 U CN 205195707U
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Abstract
Constantly perfect along with communication technology obtains the development about channel switching's device is also continuous, and more and more equipment can be realized quick switching different passageways, and channel switching's mistake causes protection device's two -way delay asymmetric, and the emergence of this kind of condition can arouse protection device's wrong action. The utility model provides a harmless auto -change over device of 2M optic fibre through the time delay of the less passageway of adjustment delay, makes two passageway delays unanimous when realizing harmless the switching, a harmless auto -change over device of 2M optic fibre, including 2M switching equipment, the 2nd 2M switching equipment, a SDH equipment, the 2nd SDH equipment, the 3rd SDH equipment, fourth SDH equipment, first repeater and second repeater, wherein fiber channel has set up master channel and alternate channel, and two be linked together through first repeater, 2M switching equipment, the 2nd 2M switching equipment and second repeater by the protection business.
Description
Technical field
The utility model relates to a kind of 2M optical fiber lossless switching device.
Background technology
Along with the development of differential protection in electric power system, the technology of communication aspects is constantly brought forth new ideas, and the cost of communication equipment and material constantly reduces, and the emergence of especially optical fiber communication impels the signal in electric power system mainly to adopt fiber optic communication network to transmit.Much local electricity communication will develop fiber optic communication network as backbone network, thus ensure that relay protection signal can not be subject to electromagnetic interference in transmitting procedure and transmission speed is fast.In the optical cable building Networks of Fiber Communications, provide not only the interface needed for periodic traffic and bandwidth, but also provide proprietary optical cable for relaying protection.Therefore electric current longitudinal differential protection not only can adopt multiplexing fiber-optic passage (data channel shared with SDH) to carry out the transmission of signal, but also can adopt dedicated optic fiber channel (utilizing the proprietary optical fiber of relaying protection in fiber optic network).Nowadays adopt the technology of the Current Differential Protection device of optical-fibre channel transmission guard signal ripe.The Three Gorges 220kV of China, the communications protection passage of the transmission line of 500kV and above is all almost optical-fibre channel.This communication mode will be following main transmission means.
The normal job requirement optical fiber transport channel of optical fiber longitudinal differential protection must be stablized, if the transmission channel of guard signal goes wrong, optical fiber longitudinal differential protection also cannot normally carry out.For ensureing the safe operation of high voltage transmission line, when differential protection signal transmission channel breaks down, differential wave cannot not should be transmitted because of the fault of transmission channel, therefore adopts the transmission channel that spare fibre is differential protection to provide protection.No matter adopt dedicated optic fiber channel or multiplex channel, all should have certain spare fibre, prevent the transmission causing during channel fiber fault carrying out differential protection signal.
At present; unified standard is there is no in the world in the specification to current comparison pilot protection 2M mouth switching device shifter; but at home; have each nets such as CHINA SOUTHERN POWER company, North China Power Grid Co., Ltd, economize grid company organized repeatedly for the test of current comparison pilot protection 2M mouth switching device shifter, related specifications and standard are also in formulation.
Constantly perfect along with the communication technology, the device about passage bridge is also constantly developed, and increasing equipment can realize switching different passage fast.Under transmission network normal operation running status, when unavoidably having fibre circuit and device fails, thus cause the increase of channel switching exception and channel bit error rate.The fault of passage likely causes the misoperation of protective relaying device, affects the stable of power system operation.In order to meet the time delay of relaying protection to optical-fibre channel, the requirement of the error rate; be necessary to analyze the impact on relaying protection such as defeated channel switching, passage error code; and to the appropriate design of protection channel and the time delay that arranges about switching; damaging of signal is also constantly goed deep into the discussion of problems such as can't harm, and various switching device shifter also constantly emerges.
Summary of the invention
The utility model is for the problem of above-mentioned proposition; a kind of harmless 2M is provided to protect switching device shifter; that opposite end 2M protects switching device shifter to record the data from transmitting terminal respectively by 2 data buffers, then by selecting correct data to be sent to protective relaying device.
The transmission channel of longitudinal differential protection signal has following 3 kinds of modes: (1) fiber direct connection; (2) based on the 2M circuit of SDH; (3) the 64k circuit of Based PC M multiplex technique.But because the communication data of 64k circuit can, through photoelectric conversion device, PCM equipment etc., cause the failure rate that 64k circuit is occurring the highest, therefore, it is more extensive that the device data-signal that fiber direct connection mode and 2M circuit transmission are protected is applied.In construction, protection circuit maintenance time, passway by the blocking-up of adjustment and switching, optical fiber, equipment produce that fault, joint are bad the fault such as to contact time, channel signal can be made to produce the problems such as interruption, alarm, error code, channel time delay increasing.
The utility model adopts the 2M circuit based on SDH, comprise a 2M switching device, 2nd 2M switching device, first, second SDH equipment, first repeater (7) and the second repeater 8, wherein optical-fibre channel is provided with master channel and alternate channel, protected business is connected with a 2M switching device (1) by the first repeater (7), one 2M switching device (1) is by a SDH(3, 4) be connected with alternate channel with master channel, in the other end master channel and alternate channel respectively with the 2nd SDH(5, 6) be connected, 2nd SDH(5, 6) be connected with protected business by the 2nd 2M switching device (2) and the second repeater (8), wherein a 2M switching device (1) comprises K switch 1, second switching device (2) comprises K switch 2.Protection business is sent by relay protection device; two switching protections couple together by primary and backup passage; under normal circumstances; master channel and alternate channel transmit data simultaneously; and by the overhead-bits transmission remote alarm information in framing 2M signal, the equipment making two ends participation protective switch is associated.When master channel breaks down, the 2M switching device (2) that can not receive data side will be switched K switch 2 and switch to alternate channel by master channel; Switch after K switch 2 switches to alternate channel, 2M switching device (2) transmits switching control command to opposite end by the overhead-bits in framing 2M signal, because what adopt is " two " mechanism, so opposite equip. can receive switching control command from master channel; After receiving switching control command, the K1 of 2M switching device (1) switches to alternate channel from master channel, and confirms switch messages by the control information in 2M overhead-bits and opposite end, finally guarantees that transmitting-receiving route is consistent, so far completes two-way switching; When after master channel fault recovery, can take the mode of automatic or manual, switch to master channel from alternate channel, its reversed process is consistent with above-mentioned two-way reversed process.
Described 2M switching device also comprises:
Duplicate supply backup module: the two-way-48V power supply be independent of each other mutually, adopt load balancing mode to work simultaneously, one block power supply breaks down can not affect the normal operation of equipment, outside has double loop power supply input function, and real-time online switching can be completed, when power module produces alarm, the alarm of power work indicator light;
Central management module: network management and monitoring are carried out to 2M line interface, and control the extraction selection of clock and the switching of protection channel;
2M interface module: meet ITU-TG.703, G.704 advise, bit rate is 2048Kb/s ± 50ppm, line code: HDB3, interface impedance: 75 Ω are non-equilibrium, frame structure: framing, non-frame structure;
Handover module: the monitoring and the passage bridge action that complete 2M signal, and buffer memory can be carried out to the 2M signal of framing, completing the extraction of channel monitoring amount and channel Control, is webmaster module assignment passage;
Webmaster module and interface: facility network tube module possesses configuration management, fault management and performance management, safety management, by RS232 or the communication of ICP/IP protocol stack.
The ambient temperature of the operational environment of this device is-5 DEG C-40 DEG C time, and device can meet normal handoff functionality.
At present; 2M protects handoff technique to be divided into 2 classes: (1) 1:1 protects switching mode; namely when normal operation; protection channel selects master channel transmission data; when master channel breaks down; be switched on alternate channel, when main channel is recovered normal, automatic or manual mode can be selected to switch back.This kind of protection, when the switching of primary channel, can produce instantaneous time delay, probably produces error code and short in size, so this switching mode damages.(2) 1+1 protection mode, namely 2M protects switching device shifter to send transmission data by primary and backup passage to opposite end 2M switching device shifter simultaneously, and 2 passages run simultaneously.Opposite end 2M protects switching device shifter to record the data from transmitting terminal respectively by 2 data buffers, then by selecting correct data to be sent to protective relaying device.This kind of protection switching mode switches for harmless.There is unique characteristic the harmless aspects such as solving transmission channel interruption, hit, alarm, error code that switches in.
The transmission channel of electric relay protection equipment often adopts the mode of " 1+1 " to carry out the protection of signal, and this mode can ensure that proterctive equipment can switch to above another intact passage fast when a transmission channel goes wrong.Thus ensure the normal transmission of relay protection signal.
Switching device shifter adopts " 1+1 " passage of 2M, and the state of Real-Time Monitoring two paths transmission, receiving end selects a good 2M passage automatically according to tunnel condition, guarantees the reliability of data traffic transmission.When primary transmission line breaks down (LOS, AIS, LOF alarm); send alarm immediately; meanwhile detect the health status of another passage; if another passage is normal; then switch to rapidly alternate channel to transmit; if two passes all breaks down, then the spare fibre of protective device is adopted directly to carry out the transmission of signal.
For ease of connecting the relay protection device of different vendor based on framing and non-framing 2M transmission means, the 2M interface of switching device shifter should support the transmission of framing and non-framing 2M simultaneously.For the ease of management, equipment adopts the ethernet network management interface based on SNMP, thus can carry out remote monitoring.The Business Management Platform of Erecting and improving thus make the management at networking convenient, fast.Equipment employing both-end switches simultaneously and switches service channel, thus guarantees that the route of relay protection device transceive communications passage is consistent, and then guarantees that the propagation delay time of relay protection device transceiver channel is consistent.Path protection equipment can ensure the normal transmission of signal in relaying protection communication.Equipment provides two-way, and independently power supply is as the Hot Spare of device, and support DC-48V power supply inputs, thus the stable operation of the equipment of guarantee.
Duplicate supply backup module: the two-way-48V power supply be independent of each other mutually, adopt load balancing mode to work, a block power supply breaks down can not affect the normal operation of equipment simultaneously.Outside has double loop power supply input function, and can complete real-time online switching.When power module produces alarm, the alarm of power work indicator light.
Central management module: network management and monitoring are carried out to 2M line interface (enters scene 2), and control the extraction selection of clock and the switching of protection channel.
2M interface module: meet ITU-TG.703, G.704 advise, bit rate is 2048Kb/s ± 50ppm, line code: HDB3, interface impedance: 75 Ω are non-equilibrium, frame structure: framing, non-frame structure.
Handover module: the monitoring and the passage bridge action that complete 2M signal.And can carry out buffer memory to the 2M signal of framing, complete the extraction of channel monitoring amount and channel Control, be webmaster module assignment passage.
Webmaster module and interface: facility network tube module possesses configuration management, fault management and performance management, safety management.By RS232 or the communication of ICP/IP protocol stack.
Environmental requirement and electromagnetic compatibility: ambient temperature is-5 DEG C-40 DEG C time, and device should be able to meet normal handoff functionality, during ambient temperature-15 DEG C ~ 65 DEG C, device should not misoperation.2M switching device shifter will be arranged in transformer station, and the alternating magnetic field in short-term that the switching of the high-intensity magnetic field that high-tension line produces and switch produces all will have influence on the normal operation of equipment.And 2M switching device shifter accesses in protection channel and runs, its safety and reliability is primary requirement.Therefore, the anti-electromagnetic interference capability, electrical specifications etc. of equipment all should meet the service conditions under adverse circumstances.
2M switching device shifter operation principle:
Switching device shifter is by completing the switching of passage to the Real-Time Monitoring of channel signal, and the switching principle of 2M switching device shifter is: adopt dual transmitting and receiving mechanism, send two-way guard signal at transmitting terminal, normal condition receiving terminal is from primary 2M channel reception; When primary 2M passage breaks down and alarm, then receiving terminal is switched to 2M passage for subsequent use continuation and receives data, and transmitting terminal also carries out transmission and two-way switching at alternate channel, ensures that the route of receiving and transmitting signal is consistent.
Protection business is sent by relay protection device; two switching protections couple together by primary and backup passage; under normal circumstances; master channel and alternate channel transmit data simultaneously; and by the overhead-bits transmission remote alarm information in framing 2M signal, the equipment making two ends participation protective switch is associated.When master channel breaks down (one direction fault), the 2nd 2M switching device 2 that can not receive data side will be switched K switch 2 and switch to alternate channel by master channel; Switch after K switch 2 switches to alternate channel, 2nd 2M switching device 2 transmits switching control command to opposite end by the overhead-bits in framing 2M signal, because what adopt is " two " mechanism, so opposite equip. can receive switching control command from master channel; After receiving switching control command, the K1 of a 2M switching device 1 switches to alternate channel from master channel, and confirms switch messages by the control information in 2M overhead-bits and opposite end, finally guarantees that transmitting-receiving route is consistent, so far completes two-way switching; When after master channel fault recovery, can take the mode of automatic or manual, switch to master channel from alternate channel, its reversed process is consistent with above-mentioned two-way reversed process.
The harmless technique effect switched: the harmless switching mode switching employing dual transmitting and receiving, primary channel exists certain contact.Harmless two the transmitting-receiving ports switched all arrange the signal of buffer to transmission and store, and are then forwarded by the signal of storage.CPU controls the time delay of two end interfaces, with channel time delay larger in two passages for reference, by the time delay of adjustment time delay smaller channels, makes two channel time delay consistent.When passage break down send alarm (as AIS, LOS and occur error code) time, trigger switching device shifter according to judgment condition.Because signal can not to cause the interruption of signal through buffer memory in handoff procedure, thus ensure the harmless switching of signal.
Accompanying drawing explanation
Fig. 1 is 2M optical fiber lossless switching device schematic diagram under normal circumstances;
Fig. 2 is the schematic diagram of 2M optical fiber lossless switching device master channel when breaking down after K2 switching over to alternate channel;
Fig. 3 is after 2M optical fiber lossless switching device K2 switching over to alternate channel, passes on the schematic diagram of switching control command from master channel to opposite end;
Fig. 4 is the schematic diagram that 2M optical fiber lossless switching device master channel switches to alternate channel.
Embodiment
The utility model provides a kind of 2M optical fiber lossless switching device, it comprises: 2M switching device 1, 2, also comprise SDH3, 4, 5, 6, and repeater 7, 8, wherein optical-fibre channel is provided with master channel and alternate channel, protected business is connected with 2M switching device 1 by repeater 7, 2M switching device 1 passes through SDH3, 4 are connected with alternate channel with master channel, in the other end master channel and alternate channel respectively with SDH5, 6 are connected, SDH5, 6 are connected with protected business by 2M switching device 2 and repeater 8, wherein the switching state K1 of 2M switching device 1 and 2 and K2 switch indicate.
As shown in Figure 1, protection business is sent by relay protection device, two switching protections couple together by primary and backup passage, under normal circumstances, master channel and alternate channel transmit data simultaneously, and by the overhead-bits transmission remote alarm information in framing 2M signal, the equipment making two ends participation protective switch is associated;
As shown in Figure 2, when master channel breaks down (one direction fault), the 2M switching device 2 that can not receive data side will be switched K switch 2 and switch to alternate channel by master channel;
As shown in Figure 3, switch after K switch 2 switches to alternate channel, 2M switching device 2 transmits switching control command to opposite end by the overhead-bits in framing 2M signal, because employing is " two " mechanism, so opposite equip. can receive switching control command from master channel;
As shown in Figure 4, after receiving switching control command, the K1 of 2M switching device 1 switches to alternate channel from master channel, and confirms switch messages by the control information in 2M overhead-bits and opposite end, finally guarantee that transmitting-receiving route is consistent, so far complete two-way switching.
Claims (2)
1. a 2M optical fiber lossless switching device, comprise a 2M switching device (1), 2nd 2M switching device (2), first SDH equipment (3), second SDH equipment (4), Three S's DH equipment (5), 4th SDH equipment (6), first repeater (7) and the second repeater 8, wherein optical-fibre channel is provided with master channel and alternate channel, two protected business are by the first repeater (7), one 2M switching device (1), 2nd 2M switching device (2) is connected with the second repeater (8), it is characterized in that: one of them protected business is connected with the first repeater (7), first repeater (7) is connected with a 2M switching device (1), one 2M switching device (1) is communicated with master channel by the first SDH equipment (3), one 2M switching device (1) is communicated with alternate channel by the second SDH equipment (4), another protected business is connected with the second repeater (8), second repeater (8) is connected with the 2nd 2M switching device (2), 2nd 2M switching device (2) is communicated with master channel by Three S's DH equipment (5), 2nd 2M switching device (2) is communicated with alternate channel by the 4th SDH equipment (6), what wherein the first SDH equipment (3) was communicated with Three S's DH equipment (5) is master channel, what the second SDH equipment (4) was communicated with the 4th SDH equipment (6) is alternate channel, one 2M switching device (1) comprises K switch 1, second switching device (2) comprises K switch 2.
2. according to a kind of 2M optical fiber lossless switching device described in claim 1, it is characterized in that: described master channel and described alternate channel are the 2M circuit based on SDH.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520618560.3U CN205195707U (en) | 2015-08-17 | 2015-08-17 | Harmless auto -change over device of 2M optic fibre |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520618560.3U CN205195707U (en) | 2015-08-17 | 2015-08-17 | Harmless auto -change over device of 2M optic fibre |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301918A (en) * | 2016-08-16 | 2017-01-04 | 安徽省瑞鼎电子技术有限公司 | Communications network system based on remote action data protection equipment |
| CN106533811A (en) * | 2016-12-30 | 2017-03-22 | 中国电子科技集团公司第三十四研究所 | SDH (Synchronous Digital Hierarchy) based redundant communication system and redundancy protection method thereof |
| CN106877299A (en) * | 2017-04-01 | 2017-06-20 | 国网山东省电力公司信息通信公司 | A kind of 500kV substation relay protections system and its test system, method of testing |
| CN107645332A (en) * | 2017-09-14 | 2018-01-30 | 国网山东省电力公司信息通信公司 | Circuit relay protection service channel and its method of work in a kind of power telecom network |
-
2015
- 2015-08-17 CN CN201520618560.3U patent/CN205195707U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301918A (en) * | 2016-08-16 | 2017-01-04 | 安徽省瑞鼎电子技术有限公司 | Communications network system based on remote action data protection equipment |
| CN106533811A (en) * | 2016-12-30 | 2017-03-22 | 中国电子科技集团公司第三十四研究所 | SDH (Synchronous Digital Hierarchy) based redundant communication system and redundancy protection method thereof |
| CN106533811B (en) * | 2016-12-30 | 2023-05-12 | 中国电子科技集团公司第三十四研究所 | SDH-based redundant communication system and redundancy protection method thereof |
| CN106877299A (en) * | 2017-04-01 | 2017-06-20 | 国网山东省电力公司信息通信公司 | A kind of 500kV substation relay protections system and its test system, method of testing |
| CN106877299B (en) * | 2017-04-01 | 2018-09-18 | 国网山东省电力公司信息通信公司 | A kind of 500kV substation relay protections system and its test system, test method |
| CN107645332A (en) * | 2017-09-14 | 2018-01-30 | 国网山东省电力公司信息通信公司 | Circuit relay protection service channel and its method of work in a kind of power telecom network |
| CN107645332B (en) * | 2017-09-14 | 2020-04-03 | 国网山东省电力公司信息通信公司 | Circuit relay protection service channel in power communication network and working method thereof |
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