CN105319958B - A kind of ultra-distance communication cable high-accuracy network time dissemination system and its method - Google Patents
A kind of ultra-distance communication cable high-accuracy network time dissemination system and its method Download PDFInfo
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- CN105319958B CN105319958B CN201510783514.3A CN201510783514A CN105319958B CN 105319958 B CN105319958 B CN 105319958B CN 201510783514 A CN201510783514 A CN 201510783514A CN 105319958 B CN105319958 B CN 105319958B
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- time service
- malfunction monitoring
- monitoring terminal
- time
- host
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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
Abstract
The invention discloses a kind of ultra-distance communication cable high-accuracy network time dissemination system and its methods, including：Time service host sends time service pulse by communication cable to multiple malfunction monitoring terminals；Malfunction monitoring terminal is mounted on the cross interconnected all positions being directly grounded along cable run, and traveling wave sensor is also equipped in each position；After malfunction monitoring terminal receives the time service pulse of time service host transmission, malfunction monitoring terminal local carries out first time clock synchronization；For each malfunction monitoring terminal revertive pulse signal to time service host, time service host obtains the time service delay of each malfunction monitoring terminal；Malfunction monitoring terminal does final clock synchronization process.Time service host is combined time service using high-precision GPS time service with the double thermostat oscillators of high-precision, has ensured the stability of time service.Malfunction monitoring terminal is inputted using multipath clock source, including host time service, local oscillator locking phase reduce being completely dependent on for terminal-pair external reference clock.
Description
Technical field
The present invention relates to technical field of electric power more particularly to a kind of ultra-distance communication cable high-accuracy network time dissemination systems
And its method.
Background technology
With the high speed development of economic construction of China, the urban network reconstruction work in China is carried out energetically.Due to electric power
Power supply reliability possessed by the decline of cable application cost and power cable itself is high, not by ground, space buildings object
Influence, not by harsh weather infringement, it is safe and out of sight durable the features such as, thus be more and more widely used.However, with frame
Empty transmission line of electricity is compared, although power cable have the advantages that it is above-mentioned, for the maintenance work especially fault localization of later stage cable
Larger difficulty is brought with positioning, and the features such as especially cable length is relatively short, line fault unobservability all determines
Cable run requires have more accurate fault distance-finding method.In practical applications, common power failure distance measuring method has single-ended
Ranging and both-end distance measuring due to being limited by that can obtain information content, will generally carry out assuming or approximate processing in single end distance measurement,
Precision tends not to meet the requirements.And in both-end distance measuring, since the clock needs of circuit both ends fault location device are accurate same
Step, therefore the precision time service of Two-terminal Fault Location device is the key point of range accuracy, existing time service is to pass through wireless parties
Formula, such time service precision are low.
Invention content
The purpose of the present invention is exactly to solve the above-mentioned problems, to provide a kind of ultra-distance communication cable high-accuracy network and award
When system and method, the time dissemination system of this method can be laid in cable tunnel, in pipe trench, not influenced by space, environment,
Realize the precision time service to tunnel, pipe trench inner cable fault location device.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of ultra-distance communication cable high-accuracy network time service method, includes the following steps：
Step 1, the time service host being mounted in substation send time service by communication cable to multiple malfunction monitoring terminals
Pulse；Malfunction monitoring terminal is mounted on the cross interconnected all positions being directly grounded along cable run, also pacifies in each position
Equipped with traveling wave sensor；
Step 2, after malfunction monitoring terminal receives the time service pulse of time service host transmission, malfunction monitoring terminal local
Carry out first time clock synchronization；
Step 3, each malfunction monitoring terminal revertive pulse signal to time service host, time service host obtain each failure prison
Survey the time service delay of terminal；
Step 4, malfunction monitoring terminal do final clock synchronization process according to the result of the step 2 and step 3.
Time service host is returned malfunction monitoring terminal while sending signal and order to time service terminal by communication cable and is supplied
Electricity；Malfunction monitoring terminal and traveling wave sensor are directly grounded position along communication cable circuit mounted on cross interconnected, will on the way
All communication cable-ends passed through all monitor, and form a complete fault traveling wave process monitoring.Time service host is installed
It in substation, is connected by communication cable between time service host and malfunction monitoring terminal, malfunction monitoring terminal and traveling wave sensing
Device is mounted on each joint along cable loop, and all cable connectors that may be implemented on the way to pass through so all monitor
Come, forms a complete fault traveling wave process monitoring.
Time service host sends the time service pulse of 1PPS by communication cable to each malfunction monitoring terminal, and host passes through closed loop
Mode carries out continual adaptive and self study to communication cable, and carries out error compensation to it, ensures each malfunction monitoring
The clock of terminal synchronizes.
The time service host uses GPS time services, while time service host is using double thermostat oscillators.
In the step 2, after the malfunction monitoring terminal receives time signal, starts locking phase, it is whole to generate malfunction monitoring
The local terminal clock signal at end, in the case where the time signal of time service host disconnects, failed terminals are local mutual by phase
Sensor obtains the 50Hz power frequency components on circuit, and be synchronous clock source into horizontal lock using the pulse of 50Hz power frequency components, therefore is
So that host time signal is disconnected can also realize that the clock of all terminals of circuit synchronizes.The time service adopted this method substantially may be used
To realize the timing tracking accuracy of 20~50ns, calculated 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 high practical value, ensure the time precision of each malfunction monitoring terminal.
In the step 3,1PPS pulses are recycled to time service by malfunction monitoring terminal successively according to the order of time service host schedules
Host, each malfunction monitoring terminal of time service host record return to the delay of time service pulse, and the half of delay is time service pulse
From time service host to the time service delay of monitoring terminal.
In the step 4, time service host leads to the time service delay data of each malfunction monitoring terminal obtained in step 3
Know that corresponding failure monitors terminal, malfunction monitoring terminal is delayed plus time service on the basis of first time clock synchronizes, is awarded
When host current correct time, ensure the time synchronization of all malfunction monitoring terminals mounted under same time service host.
A kind of system using the ultra-distance communication cable high-accuracy network time service method, including it is mounted on substation
Interior time service host, malfunction monitoring terminal and traveling wave sensor, the time service host are monitored eventually by communication cable connecting fault
End, the malfunction monitoring terminal are connect with traveling wave sensor, and the malfunction monitoring terminal is mounted on all along cable run
It is cross interconnected to be directly grounded position.
Beneficial effects of the present invention：
1), time service host is combined time service using high-precision GPS time service with the double thermostat oscillators of high-precision, has ensured and has awarded
When stability.
2), malfunction monitoring terminal is inputted using multipath clock source, including host time service, local oscillator locking phase reduce
Terminal-pair external reference clock is completely dependent on, even if can realize one if phase-locked local in the case where disconnecting time signal
The clock of all terminals of circuit synchronizes.
3) GPS time services directly, are received compared to conventional terminal, there is peace using the malfunction monitoring terminal of communication cable time service
The features such as holding position is not limited by a space, is at low cost, time service precision is high.Electric power system fault ranging is can be widely applied to, is
Ensure that the long-term normal operation of power cable provides a strong guarantee.By cable time service between host and terminal, time service precision can be with
Reach femtosecond rank.
Description of the drawings
Fig. 1 is the system connection figure of the present invention；
Fig. 2 is the time service flow chart of the present invention.
Specific implementation mode
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of ultra-distance communication cable high-accuracy network time dissemination system, including time service host, failure prison
Survey terminal and traveling wave sensor；Time service host is mounted in substation, is connect with malfunction monitoring terminal by communication cable, is realized
The transmission of signal and the power supply of terminal.
Malfunction monitoring terminal is connect with traveling wave sensor, they are mounted on each joint of cable loop, by a bus
Connection, all connectors that cable passes through on the way are all monitored, a complete process monitoring of fault traveling wave is formd.
As shown in Fig. 2, after system starts, time service host sends 1PPS's by communication cable to each malfunction monitoring terminal
High-precision time service pulse signal.
After all malfunction monitoring terminals on one circuit receive the time service pulse of time service host transmission, malfunction monitoring
Terminal local carries out first time clock synchronization, by local oscillator into horizontal lock, reduces malfunction monitoring terminal-pair host synchronization
The being completely dependent on property of signal.In order to ensure the time precision of each malfunction monitoring terminal, malfunction monitoring terminal is using high-precision
Clock Synchronization Design, in malfunction monitoring terminal itself by oscillator locking phase, even if there is time service host and malfunction monitoring terminal
Between communication suspension, clocking error of each malfunction monitoring terminal in 24 hours also can guarantee within 1us, and for a long time
The possibility of communication suspension is substantially not present.After time service host sends time signal, malfunction monitoring terminal receives time service letter
Number, and start locking phase, generate the clock signal of local terminal.In the case where time service host signal disconnects, failed terminals are local
The 50Hz power frequency components on circuit can be obtained by phase mutual inductor, and are carried out by synchronous clock source of the pulse of 50Hz power frequency components
Locking phase, therefore can realize that the clock of all terminals of circuit synchronizes host time signal disconnects.It adopts this method
Time service the timing tracking accuracy of 20~50ns may be implemented substantially, according to the traveling wave speed 170m/ μ s of high pressure polyethylene cable
It calculates, fault localization precision can reach 3.4 meters~8.5 meters substantially, and high practical value.
1PPS pulses are recycled to time service host, time service host by malfunction monitoring terminal successively according to the order of time service host schedules
Record the delay that each malfunction monitoring terminal returns to time service pulse, the half of delay be time service pulse from time service host to
Monitor the delay time of terminal；
The time service delay data of each malfunction monitoring terminal is notified corresponding terminal, malfunction monitoring terminal to exist by time service host
Normal time service pulse is delayed on the basis of reaching plus time service, you can the current correct time of time service host is obtained, to ensure
All malfunction monitoring terminal times mounted under same time service host synchronize.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (3)
1. a kind of ultra-distance communication cable high-accuracy network time service method, characterized in that include the following steps：
Step 1, the time service host being mounted in substation send time service arteries and veins by communication cable to multiple malfunction monitoring terminals
Punching；Malfunction monitoring terminal is mounted on the cross interconnected all positions being directly grounded along cable run, is also installed in each position
There is traveling wave sensor；
Step 2, after malfunction monitoring terminal receives the time service pulse of time service host transmission, malfunction monitoring terminal local carries out
First time clock synchronizes；
Step 3, each malfunction monitoring terminal revertive pulse signal to time service host, it is whole that time service host obtains each malfunction monitoring
The time service at end is delayed；
Step 4, malfunction monitoring terminal do final clock synchronization process according to the result of the step 2 and step 3；
Malfunction monitoring terminal is connect with traveling wave sensor, is mounted on each joint of cable loop, is connected by a bus, will
All connectors that cable passes through on the way all monitor, and form a complete process monitoring of fault traveling wave；Time service host is logical
The time service pulse that communication cable sends 1PPS to each malfunction monitoring terminal is crossed, host carries out communication cable by closed-loop fashion
Continual adaptive and self study, and error compensation is carried out to it, ensure that the clock of each malfunction monitoring terminal synchronizes；
The time service host uses GPS time services, while time service host is using double thermostat oscillators；
In the step 2, after malfunction monitoring terminal receives time signal, starts locking phase, generate the local of malfunction monitoring terminal
Terminal clock signal, in the case where the time signal of time service host disconnects, failed terminals are locally obtained by phase mutual inductor
50Hz power frequency components on circuit, and be synchronous clock source into horizontal lock using the pulse of 50Hz power frequency components；
In the step 3,1PPS pulses are recycled to time service master by malfunction monitoring terminal successively according to the order of time service host schedules
Machine, each malfunction monitoring terminal of time service host record return to the delay of time service pulse, the half of delay be time service pulse from
Time service delay of the time service host to monitoring terminal；
In the step 4, time service host arrives the time service delay data notice of each malfunction monitoring terminal obtained in step 3
Corresponding failure monitors terminal, and malfunction monitoring terminal is delayed on the basis of first time clock synchronizes plus time service, obtains time service master
The current correct time of machine ensures the time synchronization of all malfunction monitoring terminals mounted under same time service host.
2. a kind of ultra-distance communication cable high-accuracy network time service method as described in claim 1, characterized in that time service host
The power supply of malfunction monitoring terminal is returned while sending signal and order to time service terminal by communication cable；Malfunction monitoring terminal and
Traveling wave sensor is mounted on the cross interconnected all communication cables that is directly grounded position, will pass through on the way along communication cable circuit
Connector all monitors, and forms a complete fault traveling wave process monitoring.
3. a kind of system using ultra-distance communication cable high-accuracy network time service method described in claim 1, characterized in that
Include time service host, malfunction monitoring terminal and traveling wave sensor in substation, the time service host is by communicating electricity
Cable connecting fault monitors terminal, and the malfunction monitoring terminal is connect with traveling wave sensor, and the malfunction monitoring terminal is mounted on electricity
The all of cable curb line cross interconnected are directly grounded position.
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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 |
| 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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Address after: 250101 A203, block F, entrepreneurship square, Qilu Software Park, No.1 Shunhua Road, high tech Development Zone, Jinan City, Shandong Province Patentee after: Conway Communication Technology Co., Ltd Address before: 250101 Qilu Software Park, No. 1 Shunhua Road, Jinan High-tech Development Zone, Shandong Province, A 203 Patentee before: SHANDONG KANGWEI COMMUNICATION TECHNOLOGY Co.,Ltd. |