CN105319958A - An ultra-long distance communication cable high precision network time service system and a method thereof - Google Patents
An ultra-long distance communication cable high precision network time service system and a method thereof Download PDFInfo
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- CN105319958A CN105319958A CN201510783514.3A CN201510783514A CN105319958A CN 105319958 A CN105319958 A CN 105319958A CN 201510783514 A CN201510783514 A CN 201510783514A CN 105319958 A CN105319958 A CN 105319958A
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- time service
- monitoring terminal
- malfunction monitoring
- main frame
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Locating Faults (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention provides an ultra-long distance communication cable high precision network time service system and a method thereof. The method comprises the steps that a time service host sends time service pulses to multiple fault monitoring terminals through communication cables, wherein the fault monitoring terminals are arranged at all the positions of direct earthing and cross connection along cable lines and each position is provided with a traveling wave sensor; after the fault monitoring terminals receive the time service pulses sent by the time service host, the fault monitoring terminals perform clock synchronization for the first time locally; each fault monitoring terminal returns pulse signals to the time service host and the time service host obtains the time service delay of each fault monitoring terminal; the fault monitoring terminals perform final clock synchronization treatment. The time service host uses the high precision GPS time service and is a high precision double thermostatic bath oscillator, thereby guaranteeing the time service stability. The fault monitoring terminals employ multiple paths of clock source input, including the host time service, the local oscillator phase locking is performed and the complete dependence of the terminals on external reference clocks is reduced.
Description
Technical field
The present invention relates to technical field of electric power, particularly relate to a kind of ultra-distance communication cable high-accuracy network time dissemination system and method thereof.
Background technology
Along with the high speed development of China's economic construction, the urban network reconstruction work of China is carried out energetically.Due to the decline of power cable application cost, and the power supply reliability that power cable self has is high, by ground, space buildings thing impact, by weather extremes infringement, the feature such as durable safe and out of sight, thus obtain and apply more and more widely.But, compared with overhead transmission line, although power cable has above-mentioned advantage, but for later stage cable maintenance work particularly fault localization bring larger difficulty with location, especially the feature such as relatively short, the line fault unobservability of cable length all determines cable line and requires more accurate fault distance-finding method.In actual applications, conventional power failure distance-finding method has single end distance measurement and both-end distance measuring, and in single end distance measurement, owing to being subject to obtain information quantitative limitation, generally will carry out supposing or approximate processing, precision often can not meet the demands.And in both-end distance measuring, the clock due to circuit two ends fault location device needs precise synchronization, therefore the precision time service of Two-terminal Fault Location device is the key point of distance accuracy, and existing time service is wirelessly, and such time service precision is low.
Summary of the invention
Object of the present invention is exactly to solve the problem, a kind of ultra-distance communication cable high-accuracy network time dissemination system and method thereof are provided, the time dissemination system of the method can be laid in cable tunnel, pipe trench, not by the impact of space, environment, realize the precision time service to tunnel, pipe trench inner cable fault location device.
To achieve these goals, the present invention adopts following technical scheme:
A kind of ultra-distance communication cable high-accuracy network time service method, comprises the following steps:
Step one, the time service main frame be arranged in transformer station sends time service pulse by telecommunication cable to multiple malfunction monitoring terminal; Malfunction monitoring terminal is arranged on cable line cross interconnected directly grounded all positions along the line, is also provided with traveling wave sensor in each position;
Step 2, after malfunction monitoring terminal receives the time service pulse of time service main frame transmission, malfunction monitoring terminal local carries out first time clock synchronous;
Step 3, each malfunction monitoring terminal revertive pulse signal is to time service main frame, and time service main frame obtains the time service time delay of each malfunction monitoring terminal;
Step 4, malfunction monitoring terminal does final clock synchronous process according to the result of described step 2 and step 3.
Time service main frame is powered to returning malfunction monitoring terminal while time service terminal sends signal and order by telecommunication cable; Malfunction monitoring terminal and traveling wave sensor are arranged on cross interconnected direct earthing position along telecommunication cable loop, are all monitored by all communication cable-ends of process on the way, form a complete fault traveling wave process monitoring.Time service main frame is arranged in transformer station, connected by telecommunication cable between time service main frame and malfunction monitoring terminal, malfunction monitoring terminal and traveling wave sensor are arranged on each joint along cable loop, all cable splices of process on the way can be realized so all to monitor, form a complete fault traveling wave process monitoring.
Time service main frame sends the time service pulse of 1PPS to each malfunction monitoring terminal by telecommunication cable, main frame carries out continual self-adaptation and self study by closed-loop fashion to telecommunication cable, and error compensation is carried out to it, ensure the clock synchronous of each malfunction monitoring terminal.
Described time service main frame adopts GPS time service, and the main frame of time service simultaneously adopts two calibration cell oscillator.
In described step 2, after described malfunction monitoring terminal receives time signal, start phase-locked, generate the local terminal clock signal of malfunction monitoring terminal, when the time signal of time service main frame disconnects, failed terminals obtains the 50Hz power frequency component on circuit locally through phase place mutual inductor, and with the pulse of 50Hz power frequency component for synchronous clock source carries out phase-locked, even if therefore main frame time signal disconnects the clock synchronous that also can realize an all terminal of circuit.Adopt the time service of this kind of method substantially can realize the timing tracking accuracy of 20 ~ 50ns, calculate according to the traveling wave speed 170m/ μ s of high pressure polyethylene cable, fault localization precision can reach 3.4 meters ~ 8.5 meters substantially, and practical value is very high, ensures the time precision of each malfunction monitoring terminal.
In described step 3,1PPS pulse is recycled to time service main frame according to the order of time service host schedules by malfunction monitoring terminal successively, the each malfunction monitoring terminal of time service host record returns the time delay of time service pulse, and 1/2nd of time delay is the time service time delay of time service pulse from time service main frame to monitoring terminal.
In described step 4, the time service delay data of each malfunction monitoring terminal obtained in step 3 is notified corresponding failure monitoring terminal by time service main frame, malfunction monitoring terminal adds time service time delay on the basis of first time clock synchronous, obtain the current correct time of time service main frame, the time synchronized of all malfunction monitoring terminals mounted under ensureing same time service main frame.
A kind of system adopting described ultra-distance communication cable high-accuracy network time service method, comprise the time service main frame be arranged in transformer station, malfunction monitoring terminal and traveling wave sensor, described time service main frame connects malfunction monitoring terminal by telecommunication cable, described malfunction monitoring terminal is connected with traveling wave sensor, and described malfunction monitoring terminal is arranged on cable line all cross interconnected direct earthing position along the line.
Beneficial effect of the present invention:
1), time service main frame adopts high-precision GPS time service to combine with high precision pair calibration cell oscillator time service, ensured the stability of time service.
2), malfunction monitoring terminal adopts the input of multipath clock source, comprise main frame time service, local oscillator is phase-locked, reduces the completely dependence of terminal to outside reference clock, even if when disconnecting time signal, the local phase-locked clock synchronous that also can realize an all terminal of circuit.
3), compare conventional terminal and directly receive GPS time service, installation site is low by space constraint, cost, time service precision high to adopt the malfunction monitoring terminal of telecommunication cable time service to have.Electric power system fault range finding can being widely used in, providing powerful guarantee for ensureing that power cable normally runs for a long time.By cable time service between main frame and terminal, time service precision can reach femtosecond rank.
Accompanying drawing explanation
Fig. 1 is system connection layout of the present invention;
Fig. 2 is time service process flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, a kind of ultra-distance communication cable high-accuracy network time dissemination system, comprises time service main frame, malfunction monitoring terminal and traveling wave sensor; Time service main frame is arranged in transformer station, is connected with malfunction monitoring terminal by telecommunication cable, realizes the transmission of signal and the power supply of terminal.
Malfunction monitoring terminal is connected with traveling wave sensor, and they are arranged on each joint of cable loop, is connected, all monitored by all joints of cable on the way process, define the process monitoring that a fault traveling wave is complete by a bus.
As shown in Figure 2, after system starts, time service main frame sends the high precision time service pulse signal of 1PPS to each malfunction monitoring terminal by telecommunication cable.
Article one, after all malfunction monitoring terminals on circuit receive the time service pulse of time service main frame transmission, malfunction monitoring terminal local carries out first time clock synchronous, undertaken phase-locked by local oscillator, reduce malfunction monitoring terminal to the complete dependence of host synchronization signal.In order to ensure the time precision of each malfunction monitoring terminal, malfunction monitoring terminal adopts high-precision clock synchronous to design, phase-locked itself by oscillator in malfunction monitoring terminal, even if there is the communication suspension between time service main frame and malfunction monitoring terminal, the clocking error of each malfunction monitoring terminal in 24 hours also can ensure within 1us, and the possibility of long-time communication suspension does not exist substantially.After time service main frame sends time signal, malfunction monitoring terminal receives time signal, and starts phase-locked, generates the clock signal of local terminal.When time service host signal disconnects, the local 50Hz power frequency component obtained by phase place mutual inductor on circuit of failed terminals, and with the pulse of 50Hz power frequency component for synchronous clock source carries out phase-locked, even if therefore main frame time signal disconnects the clock synchronous that also can realize an all terminal of circuit.Adopt the time service of this kind of method substantially can realize the timing tracking accuracy of 20 ~ 50ns, calculate according to the traveling wave speed 170m/ μ s of high pressure polyethylene cable, fault localization precision can reach 3.4 meters ~ 8.5 meters substantially, and practical value is very high.
1PPS pulse is recycled to time service main frame according to the order of time service host schedules by malfunction monitoring terminal successively, the each malfunction monitoring terminal of time service host record returns the time delay of time service pulse, and 1/2nd of time delay is time service pulse from time service main frame to the delay time of monitoring terminal;
The time service delay data of each malfunction monitoring terminal is notified corresponding terminal by time service main frame, malfunction monitoring terminal adds time service time delay on the basis that normal time service pulse arrives, can obtain the current correct time of time service main frame, thus all malfunction monitorings mounted under ensureing same time service main frame are synchronous for terminal time.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (8)
1. a ultra-distance communication cable high-accuracy network time service method, is characterized in that, comprise the following steps:
Step one, the time service main frame be arranged in transformer station sends time service pulse by telecommunication cable to multiple malfunction monitoring terminal; Malfunction monitoring terminal is arranged on cable line cross interconnected directly grounded all positions along the line, is also provided with traveling wave sensor in each position;
Step 2, after malfunction monitoring terminal receives the time service pulse of time service main frame transmission, malfunction monitoring terminal local carries out first time clock synchronous;
Step 3, each malfunction monitoring terminal revertive pulse signal is to time service main frame, and time service main frame obtains the time service time delay of each malfunction monitoring terminal;
Step 4, malfunction monitoring terminal does final clock synchronous process according to the result of described step 2 and step 3.
2. a kind of ultra-distance communication cable high-accuracy network time service method as claimed in claim 1, is characterized in that, time service main frame is powered to returning malfunction monitoring terminal while time service terminal sends signal and order by telecommunication cable; Malfunction monitoring terminal and traveling wave sensor are arranged on cross interconnected direct earthing position along telecommunication cable loop, are all monitored by all communication cable-ends of process on the way, form a complete fault traveling wave process monitoring.
3. a kind of ultra-distance communication cable high-accuracy network time service method as claimed in claim 1, it is characterized in that, time service main frame sends the time service pulse of 1PPS to each malfunction monitoring terminal by telecommunication cable, main frame carries out continual self-adaptation and self study by closed-loop fashion to telecommunication cable, and error compensation is carried out to it, ensure the clock synchronous of each malfunction monitoring terminal.
4. a kind of ultra-distance communication cable high-accuracy network time service method as described in claim 1 or 2 or 3, is characterized in that, described time service main frame adopts GPS time service, and the main frame of time service simultaneously adopts two calibration cell oscillator.
5. a kind of ultra-distance communication cable high-accuracy network time service method as claimed in claim 1, it is characterized in that, in described step 2, after malfunction monitoring terminal receives time signal, start phase-locked, generate the local terminal clock signal of malfunction monitoring terminal, when the time signal of time service main frame disconnects, failed terminals obtains the 50Hz power frequency component on circuit locally through phase place mutual inductor, and with the pulse of 50Hz power frequency component for synchronous clock source carries out phase-locked.
6. a kind of ultra-distance communication cable high-accuracy network time service method as claimed in claim 3, it is characterized in that, in described step 3,1PPS pulse is recycled to time service main frame according to the order of time service host schedules by malfunction monitoring terminal successively, the each malfunction monitoring terminal of time service host record returns the time delay of time service pulse, and 1/2nd of time delay is the time service time delay of time service pulse from time service main frame to monitoring terminal.
7. a kind of ultra-distance communication cable high-accuracy network time service method as claimed in claim 1, it is characterized in that, in described step 4, the time service delay data of each malfunction monitoring terminal obtained in step 3 is notified corresponding failure monitoring terminal by time service main frame, malfunction monitoring terminal adds time service time delay on the basis of first time clock synchronous, obtain the current correct time of time service main frame, the time synchronized of all malfunction monitoring terminals mounted under ensureing same time service main frame.
8. one kind adopts the system of ultra-distance communication cable high-accuracy network time service method described in claim 1, it is characterized in that, comprise the time service main frame be arranged in transformer station, malfunction monitoring terminal and traveling wave sensor, described time service main frame connects malfunction monitoring terminal by telecommunication cable, described malfunction monitoring terminal is connected with traveling wave sensor, and described malfunction monitoring terminal is arranged on cable line all cross interconnected direct earthing position along the line.
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Cited By (2)
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| CN111007353A (en) * | 2019-11-21 | 2020-04-14 | 国家电网有限公司 | Fault detection method based on combination of Beidou time service and power distribution network |
| CN114578679A (en) * | 2022-01-21 | 2022-06-03 | 桂林电子科技大学 | Time synchronization method applied to tunnel based on time service pressure control technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111007353A (en) * | 2019-11-21 | 2020-04-14 | 国家电网有限公司 | Fault detection method based on combination of Beidou time service and power distribution network |
| CN114578679A (en) * | 2022-01-21 | 2022-06-03 | 桂林电子科技大学 | Time synchronization method applied to tunnel based on time service pressure control technology |
| CN114578679B (en) * | 2022-01-21 | 2024-01-30 | 桂林电子科技大学 | Time synchronization method applied to tunnel based on time service voltage control technology |
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