CN105406452A - Four-end line optical fiber differential protection device and method - Google Patents
Four-end line optical fiber differential protection device and method Download PDFInfo
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- CN105406452A CN105406452A CN201511028010.7A CN201511028010A CN105406452A CN 105406452 A CN105406452 A CN 105406452A CN 201511028010 A CN201511028010 A CN 201511028010A CN 105406452 A CN105406452 A CN 105406452A
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- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 5
- 239000000835 fiber Substances 0.000 claims description 28
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- 238000007726 management method Methods 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 7
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Classifications
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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
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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
- H02H7/226—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 for wires or cables, e.g. heating wires
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- H02J13/0013—
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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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The invention discloses a four-end line optical fiber differential protection device and method. The differential protection device includes a differential CPU module, a zero sequence CPU module, a distance CPU module, an alternating current plug-in, a communication management module, an optical interface module, a signal module, a tripping/closing plug-in, a display module and a power source plug-in; the alternating current plug-in acquires alternating voltage and current signals and transmits the alternating voltage and current signals to the three CUP modules; the three CUP modules receive and send information to the communication management module; the optical interface module is separately connected with the differential CPU and receives information sent by the opposite side and transmits information of the local side; and the differential CPU module, the zero sequence CPU module and the distance CPU module control the signal module and the tripping/closing plug-in according to logic judgment, transmit required information to the outside and control the switching off and switching on of an external circuit breaker. The four-end line optical fiber differential protection device is installed at each port of a four-end line and executes corresponding protection action according to differential protection calculation results.
Description
Technical field
The present invention relates to a kind of four-pole circuit fiber differential protection device and method, belong to servo protection automatic field.
Background technology
Two T-shaped nodes or " ten " type node equivalent, based on Kirchhoff's law, for four-pole circuit system, can be considered as the node be exaggerated, still meet Kirchhoff's law by current differential protection principle.When protected external area error, the electric current sum that all protected circuits flow through and differential current are 0, and when troubles inside the sample space, differential current is exactly fault current.After considering the direct-to-ground capacitance of circuit, electric current when external area error or normal operation, circuit flowed out and the electric current of inflow will produce deviation in amplitude and phase angle, differential current is now unsymmetrical current, the difference differential current of fault and the size of unsymmetrical current just can be distinguished in district, external area error.
The impact of shunt reactor and current transformer progress of disease error and the factor such as saturated if do not considered the distributed capacitance of transmission line, distribution conductance, in district; as long as differential protection escapes little balanced balanced current, can correct operation under just can ensureing that differential protection is in office and why hindering.For short overhead transmission line, capacitance current is little, when external fault, can not produce very large unsymmetrical current.For cable line; distributed capacitance is large relative to overhead transmission line; when circuit is longer or electric pressure is higher; line distribution capacitance electric current is larger; and the aperiodic component in fault current can cause the factors such as CT saturation; very large unsymmetrical current may be caused when circuit has passing through property electric current, must brake measure be taked, prevent protection misoperation.These situations are all the same for multi-point circuit current differential.But four ends or more multi-point circuit, following factor also may be had to cause malfunction or the tripping of protection:
1, during many T-type line external area error, the electric current that wherein one end circuit flows through may be the electric current sum of other several end lines, easily causes CT saturation, as shown in Figure 1, D may be caused during external fault to hold CT saturation;
2, during many T-type line internal fault, one of them terminal of outflow of bus current may be had, differential current is reduced, easily cause the tripping of protection, as shown in Figure 2, during internal fault, outflow of bus current situation may be had;
Whether the series compensation capacitance 3, on circuit and parallel reactance and circuit there are the factors such as transformer to affect the performance of protection too.
Malfunction during in order to prevent from protecting external fault, usual way adopts braking strategy exactly, namely in operating characteristics, adds braking amount.But when current transformer is seriously saturated under external fault, if protection only still can malfunction by the way of braking, meanwhile, add the sensitivity protected when excessive braking amount can affect internal fault.
In view of this, the present inventor studies this, and develop a kind of four-pole circuit fiber differential protection device and method specially, this case produces thus.
Summary of the invention
The object of this invention is to provide a kind of four-pole circuit fiber differential protection device and method.
To achieve these goals, solution of the present invention is:
A kind of four-pole circuit fiber differential protection device, comprise differential CPU module, zero sequence CPU module, distance CPU module, exchange plug-in unit, communication management module, optical interface module, signaling module, breaker tripping and closing plug-in unit, display module and power insert, wherein, described interchange plug-in unit is connected with the signal input part of differential CPU module, zero sequence CPU module, distance CPU module, the current and voltage signals collected is sent to respectively differential CPU module, zero sequence CPU module, distance CPU module; Described signaling module, breaker tripping and closing plug-in unit are connected with the signal output part of differential CPU module, zero sequence CPU module, distance CPU module respectively, described communication management module is connected with differential CPU module, zero sequence CPU module, distance CPU module respectively, described optical interface module is connected with differential CPU module, and display module is connected with communication management module.
As preferably, described differential CPU module, zero sequence CPU module, distance CPU module all adopt 32 or 64 bit processors to control.
As preferably, described display module adopts LCD MODULE, specifically can adopt touch-screen.
As preferably, described power insert provides direct current 5V and direct current 24V working power for modules.
The four-pole circuit fiber differential protection device operation principle of said structure: power module provides all working powers for modules.Exchange plug-in unit collection alternating voltage current signal and be sent to differential CPU, zero sequence CPU, distance CPU, three CPU are accepted by CAN and send information to communication management module, simultaneous communications administration module shows information to LCD MODULE by internal data bus mode, also accepts the operation information of LCD MODULE simultaneously.Light mouth module is connected to separately differential CPU, and the information accepting offside transmission sends the information of this side simultaneously.Differential CPU module, zero sequence CPU module, distance CPU module according to Logic judgment control signal module and breaker tripping and closing module, give the information required for outside transmission and control outside circuit breaker deciliter.
When the four-pole circuit fiber differential protection device of said structure uses; be arranged on each port of four-pole circuit respectively; when in land or when breaking down outside region; the differentiation made precision maneuver in time or be failure to actuate, realizes alternate and synchronization function examined by ground distance protection, band direction zero-sequenceprotection, three-phase single shot reclosing band, hand closes function such as the inspection same period and failure protection etc.
A kind of four-pole circuit optical fibre differential protection method, comprises the steps:
1) the four-pole circuit fiber differential protection device of said structure is arranged on each port of four-pole circuit, wherein, the protective device of the first port is connected with the protective device communication of the second port and the 4th port respectively, and the protective device of the second port is connected with the protective device communication of the 3rd port;
2) when communicating normal, current information transmits simultaneously in the two directions, article one, transmission link is by the 4th port (begin chain D holds), and with the electric current of the 4th port for benchmark, after the electric current of the 4th port is sent to the first port, first port, by after the current synchronization of the electric current of the port and the 4th port, mails to the second port; Second port is by after the current synchronization of the electric current of the port and the 4th port, then the data of the 4th port, the first port and the second port are together packed and mail to the 3rd port (last-of-chain C holds), after 3rd port receives, by the current synchronization of the electric current of the port and the 4th port, the first port and the second port, obtain the synchronizing current data of four ports; An other transmission link process is basic identical with a upper transmission link, and transmission direction, by the 3rd port, through the first port and the second port transfer, finally obtains the synchronizing current data of four ports at the 4th port;
3) because circuit respectively holds protective device to be independently sample, can not ensure the synchronism of sampling, data correction must be taked synchronous, and during transfer of data, the time delay of 2 ports adopts following formula:
, wherein, T1 is the data delivery time of transmitting terminal, T2 is the data receive time of receiving terminal, T3 is receiving terminal data delivery times again, T4 is transmitting terminal data receive time, data sending terminal and receiving terminal are sampled alone with identical frequency separately, phase angle difference between them is θ, T4 deducts transmission delay Td, moment t (i) that transmitting terminal is corresponding is engraved in when calculating the T3 of receiving terminal, and sampling sequence number M (i) that the current data of receiving terminal is corresponding, the current phasor of the transmitting terminal corresponding with sequence number is rotated θ, obtain the synchronizing current vector with the receiving terminal T3 moment, for the processing procedure of receiving terminal and transmitting terminal similar, data are after revising, carry out differential protection calculating,
4) four-pole circuit fiber differential protection device performs corresponding protection act according to differential protection result of calculation.
As preferably, the protective device of described 3rd port is connected with the protective device communication of the 4th port, forms alternate channel; when other certain communication channel in working breaks down; passage can be realized automatically switch, drop into alternate channel, differential protection is resumed work.
Four-pole circuit fiber differential protection device of the present invention and method, have the following advantages:
1, on the basis of original three-terminal line optical differential, only need to increase separate unit circuit optical fiber differential protection and dedicated optic fiber channel and equipment just can realize;
2, four-pole circuit optical fiber differential protective is not only applicable to the circuit optical fiber differential protection of four ends, is also applicable to the optical fiber differential protective of three ends or two-termial line;
3, adopt the data syn-chronization mode of innovation, ensure the reliability of four-pole circuit four side differential protection.
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is fault schematic diagram (external fault) of the prior art;
Fig. 2 is fault schematic diagram (internal fault) of the prior art;
Fig. 3 is the four-pole circuit fiber differential protection device module frame chart of the present embodiment;
Fig. 4 is the four-pole circuit fiber differential protection device scheme of installation of the present embodiment;
Fig. 5 is the sampling data synchronization correction schematic diagram of the present embodiment;
Fig. 6 is the differential action performance plot of the present embodiment.
Embodiment
As shown in Figure 3, a kind of four-pole circuit fiber differential protection device, comprise differential CPU module 1, zero sequence CPU module 2, distance CPU module 3, exchange plug-in unit 4, communication management module 5, optical interface module 6, signaling module 7, breaker tripping and closing plug-in unit 8, display module 9 and power insert, wherein, described interchange plug-in unit 4 is connected with the signal input part of differential CPU module 1, zero sequence CPU module, distance CPU module 3, the current and voltage signals collected is sent to respectively differential CPU module, zero sequence CPU module, distance CPU module; Wherein, differential CPU module 1: according to the current and voltage signals exchanging plug-in unit collection, uses Differential Protection Theory calculate and judge whether line fault belongs to zone fault; Zero sequence CPU module 2: according to the current and voltage signals exchanging plug-in unit collection, uses zero-sequenceprotection principle calculate and judge whether line fault belongs to zone fault; Distance CPU module 3: according to the current and voltage signals exchanging plug-in unit collection, uses principle of distance relay calculate and judge whether line fault belongs to zone fault.
Described signaling module 7, breaker tripping and closing plug-in unit 8 are connected with the signal output part of differential CPU module 1, zero sequence CPU module 2, distance CPU module 3 respectively, wherein, and signaling module 7: for externally all kinds of run signal of dispensing device, alarm signal and actuating signal; Breaker tripping and closing plug-in unit 8: according to the result of calculation of differential CPU module 1, zero sequence CPU module 2, distance CPU module 3, final controlling element action outlet order.
Described communication management module 5 is connected with differential CPU module 1, zero sequence CPU module 2, distance CPU module 3 respectively, and communication management module 5 is for device intercommunication management, and the telecommunication management of device and electric substation automation system.Described optical interface module 6 is connected to separately differential CPU module 1, and the information receiving offside transmission sends the information of this side simultaneously, and display module 9 is connected with communication management module.Power insert provides direct current 5V and direct current 24V working power for modules.
In the present embodiment, described display module 9 adopts LCD MODULE, specifically adopts touch-screen.Differential CPU module 1, zero sequence CPU module 2, distance CPU module 3 all adopt Microprocessor S3C44B0X, specifically can adopt the processor of 32 or 64.
The four-pole circuit fiber differential protection device operation principle of said structure: power module provides all working powers for modules.Interchange plug-in unit 4 gathers alternating voltage current signal and is sent to differential CPU module 1, zero sequence CPU module, distance CPU module 3, three CPU module are accepted by CAN and send information to communication management module 5, simultaneous communications administration module 5 shows information to LCD MODULE 9 by internal data bus mode, also accepts the operation information of LCD MODULE 9 simultaneously.Optical interface module 6 is connected to separately differential CPU module 1, and the information accepting offside transmission sends the information of this side simultaneously.Differential CPU module 1, zero sequence CPU module, distance CPU module 3 pieces according to Logic judgment control signal module 7 and breaker tripping and closing module 8, give the information required for outside transmission and control outside circuit breaker deciliter.
When the four-pole circuit fiber differential protection device of said structure uses; be arranged on each port of four-pole circuit respectively; when in land or when breaking down outside region; the differentiation made precision maneuver in time or be failure to actuate, realizes alternate and synchronization function examined by ground distance protection, band direction zero-sequenceprotection, three-phase single shot reclosing band, hand closes function such as the inspection same period and failure protection etc.
A kind of four-pole circuit optical fibre differential protection method, comprises the steps:
1) four-pole circuit fiber differential protection device is arranged on each port of four-pole circuit, wherein, the protective device of the first port A is connected with the protective device communication of the second port B and the 4th port D respectively, and the protective device of the second port B is connected with the protective device communication of the 3rd port C; The protective device of described 3rd port C and the protective device of the 4th port D also can carry out communication and be connected, form alternate channel, when other certain communication channel in working breaks down, passage can be realized and automatically switch (being arranged by control word), drop into alternate channel, differential protection is resumed work;
2) when communicating normal, current information transmits simultaneously in the two directions, article one, transmission link is by the 4th port (begin chain D holds), and with the electric current of the 4th port D for benchmark, after the electric current of the 4th port D is sent to the first port A, first port A, by after the current synchronization of the electric current of the port and the 4th port D, mails to the second port B; Second port B is by after the current synchronization of the electric current of the port and the 4th port D, then the data of the 4th port D, the first port A and the second port B are together packed and mail to the 3rd port (last-of-chain C holds), after 3rd port C receives, by the current synchronization of the electric current of the port and the 4th port D, the first port A and the second port B, obtain the synchronizing current data of four ports; An other transmission link process is basic identical with a upper transmission link, and transmission direction, by the 3rd port C, through the first port A and the second port B transfer, finally obtains the synchronizing current data of four ports at the 4th port D; As can be seen from above-mentioned communication process, the data that can obtain all ends of a reference synchronization are respectively held at begin chain/last-of-chain C end, D, and the data at all stations of 2 reference synchronization can be obtained at the first port A and the second port B, realize the information sharing at all stations;
3) because four-pole circuit optical fiber differential protective compares is the current value that circuit is respectively held, in order to ensure the correctness of protection calculation, carry out the current value that electric current that the circuit needed for differential calculating respectively holds must be synchronization, because circuit respectively holds protective device to be independently sample, the synchronism of sampling can not be ensured, data correction must be taked synchronous, and during transfer of data, the time delay of 2 ports (N end and M end) adopts following formula:
, wherein, T1 is the data delivery time of transmitting terminal M, T2 is the data receive time of receiving terminal N, T3 is receiving terminal N data delivery times again, T4 is transmitting terminal M data receive time, data sending terminal M samples alone with identical frequency separately with receiving terminal N, phase angle difference between them is θ, T4 deducts transmission delay Td, moment t (i) that transmitting terminal M is corresponding is engraved in when calculating the T3 of receiving terminal N, and sampling sequence number M (i) that the current data of receiving terminal N is corresponding, the current phasor of the transmitting terminal M corresponding with sequence number is rotated θ, obtain the synchronizing current vector with the receiving terminal NT3 moment, for the processing procedure of receiving terminal N and transmitting terminal M similar, data are after revising, just differential protection calculating can be carried out,
4) four-pole circuit fiber differential protection device performs corresponding protection act according to differential protection computation structure.
The basic differential criterion of differential protection is as follows:
In formula
for differential current,
for stalling current,
,
for restraint coefficient.
Differential for four sides, the operating characteristics protected as shown in Figure 6 is two broken lines.Wherein slope
be applicable to small area analysis region, CT characteristic is operated in linear zone, definite value
for the minimum initiation value of differential protection, definite value
choose and can ensure that CT operates in linear zone, when stalling current is greater than
time, think that CT progresses into inelastic region.Slope
be applicable to big current territory, CT characteristic is close or enter saturated, by selecting the slope be applicable to
strengthen braking amount to prevent protection misoperation.
Four-pole circuit fiber differential protection device described in the present embodiment and method, 1, only need to increase separate unit circuit optical fiber differential protection and dedicated optic fiber channel on the basis of original three-terminal line optical differential and equipment just can realize; 2, four-pole circuit optical fiber differential protective is not only applicable to the circuit optical fiber differential protection of four ends, is also applicable to the optical fiber differential protective of three ends or two-termial line; 3, adopt the data syn-chronization mode of innovation, ensure the reliability of four-pole circuit four side differential protection.
Above-described embodiment and graphic and non-limiting product form of the present invention and style, any person of an ordinary skill in the technical field, to its suitable change done or modification, all should be considered as not departing from patent category of the present invention.
Claims (6)
1. a four-pole circuit fiber differential protection device, it is characterized in that: comprise differential CPU module, zero sequence CPU module, distance CPU module, exchange plug-in unit, communication management module, optical interface module, signaling module, breaker tripping and closing plug-in unit, display module and power insert, wherein, described interchange plug-in unit is connected with the signal input part of differential CPU module, zero sequence CPU module, distance CPU module, the current and voltage signals collected is sent to respectively differential CPU module, zero sequence CPU module, distance CPU module; Described signaling module, breaker tripping and closing plug-in unit are connected with the signal output part of differential CPU module, zero sequence CPU module, distance CPU module respectively, described communication management module is connected with differential CPU module, zero sequence CPU module, distance CPU module respectively, described optical interface module is connected with differential CPU module, and display module is connected with communication management module.
2. a kind of four-pole circuit fiber differential protection device as claimed in claim 1, is characterized in that: described differential CPU module, zero sequence CPU module, distance CPU module all adopt 32 or the control of 64 bit processors.
3. a kind of four-pole circuit fiber differential protection device as claimed in claim 1, is characterized in that: described display module adopts touch-screen.
4. a kind of four-pole circuit fiber differential protection device as claimed in claim 1, is characterized in that: described power insert provides direct current 5V and direct current 24V working power for modules.
5. the differential protecting method of a kind of four-pole circuit fiber differential protection device as claimed in claim 1, is characterized in that: comprise the steps:
1) the four-pole circuit fiber differential protection device of said structure is arranged on each port of four-pole circuit, wherein, the protective device of the first port is connected with the protective device communication of the second port and the 4th port respectively, and the protective device of the second port is connected with the protective device communication of the 3rd port;
2) when communicating normal, current information transmits simultaneously in the two directions, article one, transmission link is by the 4th port, and with the electric current of the 4th port for benchmark, after the electric current of the 4th port is sent to the first port, first port, by after the current synchronization of the electric current of the port and the 4th port, mails to the second port; Second port is by after the current synchronization of the electric current of the port and the 4th port, then the data of the 4th port, the first port and the second port are together packed and mail to the 3rd port, after 3rd port receives, by the current synchronization of the electric current of the port and the 4th port, the first port and the second port, obtain the synchronizing current data of four ports; An other transmission link process is basic identical with a upper transmission link, and transmission direction, by the 3rd port, through the first port and the second port transfer, finally obtains the synchronizing current data of four ports at the 4th port;
3) because circuit respectively holds protective device to be independently sample, can not ensure the synchronism of sampling, data correction must be taked synchronous, and during transfer of data, the time delay of 2 ports adopts following formula:
, wherein, T1 is the data delivery time of transmitting terminal, T2 is the data receive time of receiving terminal, T3 is receiving terminal data delivery times again, T4 is transmitting terminal data receive time, data sending terminal and receiving terminal are sampled alone with identical frequency separately, phase angle difference between them is θ, T4 deducts transmission delay Td, moment t (i) that transmitting terminal is corresponding is engraved in when calculating the T3 of receiving terminal, and sampling sequence number M (i) that the current data of receiving terminal is corresponding, the current phasor of the transmitting terminal corresponding with sequence number is rotated θ, obtain the synchronizing current vector with the receiving terminal T3 moment, for the processing procedure of receiving terminal and transmitting terminal similar, data are after revising, carry out differential protection calculating,
4) four-pole circuit fiber differential protection device performs corresponding protection act according to differential protection result of calculation.
6. the differential protecting method of a kind of four-pole circuit fiber differential protection device as claimed in claim 5; it is characterized in that: the protective device of described 3rd port is connected with the protective device communication of the 4th port; form alternate channel; when other certain communication channel in working breaks down; realize passage to automatically switch; drop into alternate channel, differential protection is resumed work.
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| CN106207990A (en) * | 2016-07-13 | 2016-12-07 | 深圳供电局有限公司 | Rapid protection device and protection method of flexible direct current system |
| CN106199330A (en) * | 2016-06-24 | 2016-12-07 | 国电南瑞南京控制系统有限公司 | A kind of marine wind electric field collection line fault alignment system and method |
| CN109687403A (en) * | 2018-11-16 | 2019-04-26 | 国网江苏省电力有限公司盐城供电分公司 | A kind of four side form analog quantity synchronous method of double-circuit line on same pole |
| CN113098591A (en) * | 2021-02-24 | 2021-07-09 | 云谷技术(珠海)有限公司 | Distributed DTU optical fiber differential protection circuit |
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| CN113098591B (en) * | 2021-02-24 | 2022-04-01 | 云谷技术(珠海)有限公司 | Distributed DTU optical fiber differential protection circuit |
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