CN106685563A - High-precision time-keeping system for transformer station side - Google Patents
High-precision time-keeping system for transformer station side Download PDFInfo
- Publication number
- CN106685563A CN106685563A CN201611104217.2A CN201611104217A CN106685563A CN 106685563 A CN106685563 A CN 106685563A CN 201611104217 A CN201611104217 A CN 201611104217A CN 106685563 A CN106685563 A CN 106685563A
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- China
- Prior art keywords
- clock
- time
- synchronous
- high accuracy
- machine room
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0617—Systems characterised by the synchronising information used the synchronising signal being characterised by the frequency or phase
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
Abstract
The invention discloses a high-precision time-keeping system for a transformer station side, and the system employs an original Ethernet link of a communication machine room. When a time synchronization main device of the communication machine room loses the time reference, a high-precision frequency signal obtained through a synchronous Ethernet serves as a time-keeping reference of time synchronization equipment of the machine room. Meanwhile, the system also can employ an existing Ethernet network from the communication machine room to a relay protection machine room, and does not need to employ a local oscillator for time keeping. The high-precision frequency reference obtained through the synchronous Ethernet serves as a time-keeping signal, thereby continuing to maintain the high-precision time synchronization output. The interior of the communication machine room is provided with a high-precision time synchronization device, and the high-precision time synchronization device is provided with a GPS and a Beidou satellite, which serve as a time service reference and a frequency reference. Meanwhile, the time service reference and the frequency reference are transmitted to the far-end relay protection machine room through a communication optical cable, and a time synchronization extension device of the relay protection machine room is monitored.
Description
Technical field
The present invention relates to transformer station's time synchronized field, more particularly to a kind of transformer substation side high accuracy Time keeping system.
Background technology
With the progress of science and technology, the various protective relaying devices of transformer substation side and primary equipment need the high-precision time same
Step, current power industry standard has had the timing tracking accuracy requirement of 1us.Now substantially by time synchronism apparatus come real
The time synchronized networking of existing transformer substation side and precise synchronization, time synchronism apparatus are furnished with GPS, big-dipper satellite receptor
Time reference and frequency reference are obtained, inside has time phaselocked loop and frequency phase lock ring to carry out the fluctuation of filtration time and frequency, and
Locking fiducial time and frequency, by time and frequency to other equipment needed thereby distributions, if losing satellite-signal, drop-out time
Benchmark and frequency reference, the punctual state of at this moment device entrance, are realized keeping by the rubidium clock in device or high-grade constant-temperature crystal oscillator
When.Because rubidium clock and constant-temperature crystal oscillator all exist aging, so punctual precision is limited by aging speed, typically it is extremely difficult to
The punctual precision of 1us/24 hours.
The content of the invention
Present invention seek to address that the problems referred to above, and a kind of transformer substation side high accuracy Time keeping system is proposed, so as to not increase
On the premise of complexity of establishing network and equipment cost, punctual precision of the time synchronism apparatus under satellite-signal exception is improved, improved
The reliability of whole electrical network.
For achieving the above object, the invention provides a kind of transformer substation side high accuracy Time keeping system, its device support from
Clock, tracking clock are extracted very much on the net, floating and shaking for clock is filtered, and distributes clock, can reach and meet ITU-T
G.8261 standard, its implementation can after synchronizer drop-out time benchmark, as punctual clock original be continued to
There are the distribution and transmission of split-second precision, time precision is unaffected, greatly improve time synchronism apparatus in satellite-signal failure
Or the reliability and precision under loss situation.Its implementation can be realized by programmable array such as FPGA, CPLD, EPLD
Synchronous ether extracts clock, tracking clock, filters floating and shaking for clock, and distributes clock, it is also possible to by business core
Piece realizes extracting clock, tracking clock, filtering floating and shaking for clock for synchronous ether, and distributes clock.Its performance can
Reach ITU-T standards G.8261.
In networking, by using the original ethernet link of communications equipment room, when the time synchronized master device of communications equipment room
When losing time reference, high accuracy frequency signal the keeping time as communications equipment room time synchronism equipment obtained by synchronous ether
Benchmark, it is also possible to using the Ethernet of existing communications equipment room to relay protection machine room, when the time synchronized of relay protection machine room is filled
Put when losing time reference, kept time without using local oscillator, and the high accuracy frequency reference obtained by the use of synchronous ether as
Punctual signal, so as to continue to high-precision time synchronized output.There is precise synchronization in described communications equipment room
Device, this synchronizer is furnished with GPS, big-dipper satellite as time service benchmark and frequency reference, while passing through communications optical cable by time service
Benchmark and frequency reference are sent to the relay protection machine room of distal end, while monitoring the time synchronized expanding unit of relay protection machine room.
Compared with prior art, the present invention efficiently solves the problems, such as following：The various protective relaying devices of transformer substation side
High-precision time synchronized, current power industry standard is needed to have the timing tracking accuracy requirement of 1us with primary equipment.It is existing
In time synchronized networking and precise synchronization that transformer substation side is substantially realized by time synchronism apparatus, time synchronized
Device is furnished with GPS, big-dipper satellite receptor to obtain time reference and frequency reference, and there are time phaselocked loop and frequency phase lock in inside
Ring carrys out the fluctuation of filtration time and frequency, and locks fiducial time and frequency, by time and frequency to other equipment needed thereby distributions,
If losing satellite-signal, drop-out time benchmark and frequency reference, at this moment device enters punctual state, by the rubidium clock in device
Or high-grade constant-temperature crystal oscillator is realizing keeping time.Due to rubidium clock and constant-temperature crystal oscillator all exist it is aging, so punctual precision is restricted
In aging speed, the punctual precision of 1us/24 hours is typically extremely difficult to.
Description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Specific embodiment
In order that the purpose of the present invention, technical scheme and beneficial effect become more apparent, below in conjunction with the accompanying drawings and implement
Example, the present invention will be described in further detail.It should be noted that specific embodiment described herein is only to explain this
It is bright, it is not intended to limit the present invention.
Referring to Fig. 1,
A kind of transformer substation side high accuracy Time keeping system, by using the original ethernet link of communications equipment room, works as communication equipment
When the time synchronized master device in room loses time reference, the high accuracy frequency signal obtained by synchronous ether is used as communications equipment room
The punctual benchmark of time synchronism equipment, it is also possible to using the Ethernet of existing communications equipment room to relay protection machine room, when after
When the time synchronism apparatus for protecting machine room lose time reference, kept time without using local oscillator, and utilized what synchronous ether was obtained
High accuracy frequency reference is exported as punctual signal so as to continue to high-precision time synchronized；In described communications equipment room
Inside there are high-precision time synchronizing apparatus, this synchronizer is furnished with GPS, big-dipper satellite as time service benchmark and frequency reference, while
Time service benchmark and frequency reference are sent to by communications optical cable for the relay protection machine room of distal end, while monitoring the time synchronized of relay protection machine room
Expanding unit.
As further technical scheme of the invention, the time synchronized master device in the communications equipment room have it is synchronous with
Function too, can connect synchronous ethernet, when clock, tracking are extracted from the upper level Ethernet of high-precise synchronization
Clock, floating and shaking for clock is filtered, and distribute clock.
As further technical scheme of the invention, can pass through commercial chip realize synchronization ether extraction clock, with
Track clock, floating and shaking for clock is filtered, and distribute clock.
Further technical scheme is obtained as of the invention, can be realized by programmable array such as FPGA, CPLD, EPLD synchronous
Ether extracts clock, tracking clock, filters floating and shaking for clock, and distributes clock.
Further technical scheme is obtained as of the invention, the high accuracy frequency signal obtained by synchronous ether is used as communication equipment
The punctual benchmark of room time synchronism equipment, can be in synchronizer drop-out time base by the synchronous local clock of Ethernet
After standard, the distribution and transmission of original split-second precision are continued to as punctual clock, time precision is unaffected, greatly improves
Reliability and precision of the time synchronism apparatus under satellite-signal failure or loss situation.
Further technical scheme is obtained as of the invention, the time synchronized expanding unit in the relay protection machine room has synchronous
The function of ether, can connect synchronous ethernet, when clock, tracking are extracted from the upper level Ethernet of high-precise synchronization
Clock, floating and shaking for clock is filtered, and distribute clock.
As further technical scheme of the invention, can pass through commercial chip realize synchronization ether extraction clock, with
Track clock, floating and shaking for clock is filtered, and distribute clock.
Further technical scheme is obtained as of the invention, can be realized by programmable array such as FPGA, CPLD, EPLD synchronous
Ether extracts clock, tracking clock, filters floating and shaking for clock, and distributes clock.
In the present invention, the synchronous ether clock module of design in time synchronism apparatus, this module extract clock, tracking clock,
Floating and shaking for clock is filtered, and distributes clock.The punctual module of time synchronism apparatus can use the defeated of synchronous ether module
Go out clock as punctual benchmark.
The extraction time clock feature of synchronous ether clock module, shows as that ether can be extracted from the physical layer of Ethernet code stream
Network clock, this clock can be used as the reference clock of local clock phaselocked loop.
The tracking clock function of synchronous ether clock module, floating and shaking for clock is filtered, show as being set in this device
In respect of the phaselocked loop of synchronous ether clock, the reference clock of this phaselocked loop is the ethernet clock for extracting, during the source of this phaselocked loop
Clock for time synchronism apparatus local clock, by hardware phase lock high precision mode or software phlase locking mode, filter clock float and
Shake.Its hardware phase-locked-loop can be that commercial chip is realized, or discrete circuit is built, or programmable logic device
Part programming realization；Its software phlase locking mode can have software algorithm to coordinate peripheral hardware circuit realiration.
The punctual module of design, the aerial time signal of this module monitors, when satellite-signal goes out active in time synchronism apparatus
Or it is abnormal, in order to avoid the decline of time synchronized performance, then enter punctual pattern, by above-mentioned synchronous ether module export when
Used as punctual clock, because the link on ground does not have exception, the synchronous ether clock that terrestrial links are obtained is followed clock signal
ITU-T standards G.8261, then can be traceable to Primary Clock performance G.811, and this clock can continue as punctual clock
The performance indications of satellite-signal time service are maintained, so as to greatly promote the time synchronized q＆r of transformer substation side.Present base
Originally it is time synchronized networking and the precise synchronization that transformer substation side is realized by time synchronism apparatus, time synchronism apparatus
It is furnished with GPS, big-dipper satellite receptor to obtain time reference and frequency reference, inside has time phaselocked loop and frequency phase lock ring
The fluctuation of filtration time and frequency, and fiducial time and frequency are locked, by time and frequency to other equipment needed thereby distributions, if
Lose satellite-signal, then drop-out time benchmark and frequency reference, at this moment device enter punctual state, by the rubidium clock in device or
High-grade constant-temperature crystal oscillator is realizing keeping time.Due to rubidium clock and constant-temperature crystal oscillator all exist it is aging, so punctual precision is limited by always
The speed of change, is typically extremely difficult to the punctual precision of 1us/24 hours.
Transformer substation side is currently synchronous isolated island, is completely dependent on satellite-signal as a reference source, if satellite-signal lose or
Person's exception, then the time signal and frequency signal of all time synchronism apparatus in synchronous isolated island degrade.The present invention proposes a kind of
The new method of synchronization, that is, introduce ethernet clock as the backup clock of synchronous isolated island, time synchronism apparatus design it is synchronous with
Too in the case of module, synchronous ether clock can be run through the whole network, form the synchronous ethernet on ground, in the air abnormal signal
Or when losing, using synchronous ether clock as punctual benchmark, reach temporal quality and do not degrade, it is punctual better than 1us/24 hours
Precision.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, technology according to the present invention scheme and its
Inventive concept equivalent or change in addition, all should be included within the scope of the present invention.
Claims (8)
1. a kind of transformer substation side high accuracy Time keeping system, it is characterised in that by using the original ethernet link of communications equipment room,
When the time synchronized master device of communications equipment room loses time reference, the high accuracy frequency signal obtained by synchronous ether is used as
The punctual benchmark of communications equipment room time synchronism equipment, it is also possible to using the ether of existing communications equipment room to relay protection machine room
Network, when the time synchronism apparatus of relay protection machine room lose time reference, is kept time without using local oscillator, and utilize it is synchronous with
The high accuracy frequency reference for obtaining very much is exported as punctual signal so as to continue to high-precision time synchronized；Described
There are high-precision time synchronizing apparatus in communications equipment room, this synchronizer is furnished with GPS, big-dipper satellite as time service benchmark and frequency base
Standard, while time service benchmark and frequency reference are sent to by communications optical cable for the relay protection machine room of distal end, while monitoring relay protection machine room
Time synchronized expanding unit.
2. a kind of transformer substation side high accuracy Time keeping system as claimed in claim 1, it is characterised in that：In the communications equipment room
Time synchronized master device there is the function of synchronous ether, synchronous ethernet can be connected, from upper level high-precise synchronization
Ethernet on extract clock, tracking clock, filter floating and shaking for clock, and distribute clock.
3. a kind of transformer substation side high accuracy Time keeping system as claimed in claim 2, it is characterised in that：Commercial chip can be passed through
Extracting clock, tracking clock, filtering floating and shaking for clock for synchronous ether is realized, and distributes clock.
4. a kind of transformer substation side high accuracy Time keeping system as claimed in claim 2, it is characterised in that：Can be by may be programmed battle array
Row such as FPGA, CPLD, EPLD realize extracting clock, tracking clock, filtering floating and shaking for clock for synchronous ether, and distribute
Clock.
5. a kind of transformer substation side high accuracy Time keeping system as claimed in claim 1, it is characterised in that：Obtained by synchronous ether
High accuracy frequency signal as communications equipment room time synchronism equipment punctual benchmark, when by synchronous local of Ethernet
Clock can continue to distribution and the biography of original split-second precision after synchronizer drop-out time benchmark as punctual clock
Pass, time precision is unaffected, greatly improve reliability of the time synchronism apparatus under satellite-signal failure or loss situation
And precision.
6. a kind of transformer substation side high accuracy Time keeping system as claimed in claim 1, it is characterised in that：In the relay protection machine room
Time synchronized expanding unit there is the function of synchronous ether, synchronous ethernet can be connected, from upper level, high accuracy is same
Clock, tracking clock are extracted on the Ethernet of step, floating and shaking for clock is filtered, and distributes clock.
7. a kind of transformer substation side high accuracy Time keeping system as claimed in claim 2, it is characterised in that：Commercial chip can be passed through
Extracting clock, tracking clock, filtering floating and shaking for clock for synchronous ether is realized, and distributes clock.
8. a kind of transformer substation side high accuracy Time keeping system as claimed in claim 2, it is characterised in that：Can be by may be programmed battle array
Row such as FPGA, CPLD, EPLD realize extracting clock, tracking clock, filtering floating and shaking for clock for synchronous ether, and distribute
Clock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611104217.2A CN106685563A (en) | 2016-12-05 | 2016-12-05 | High-precision time-keeping system for transformer station side |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611104217.2A CN106685563A (en) | 2016-12-05 | 2016-12-05 | High-precision time-keeping system for transformer station side |
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| Publication Number | Publication Date |
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| CN106685563A true CN106685563A (en) | 2017-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611104217.2A Pending CN106685563A (en) | 2016-12-05 | 2016-12-05 | High-precision time-keeping system for transformer station side |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109379157A (en) * | 2018-11-23 | 2019-02-22 | 国网上海市电力公司 | The high-precision substation clock synchronization apparatus eliminated based on clock jitter |
| CN110673466A (en) * | 2019-10-18 | 2020-01-10 | 济南启天电子有限公司 | Time server |
| CN112148065A (en) * | 2019-06-28 | 2020-12-29 | 华为技术有限公司 | Time synchronization method and server |
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| CN1642068A (en) * | 2004-01-02 | 2005-07-20 | 上海欣泰通信技术有限公司 | Time supply and synchronizing system for telecommunication network |
| US7079807B1 (en) * | 1998-12-11 | 2006-07-18 | Daum Daniel T | Substantially integrated digital network and broadcast radio method and apparatus |
| CN101789627A (en) * | 2010-01-06 | 2010-07-28 | 江苏方天电力技术有限公司 | High-precision Ethernet timing device |
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2016
- 2016-12-05 CN CN201611104217.2A patent/CN106685563A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7079807B1 (en) * | 1998-12-11 | 2006-07-18 | Daum Daniel T | Substantially integrated digital network and broadcast radio method and apparatus |
| CN1642068A (en) * | 2004-01-02 | 2005-07-20 | 上海欣泰通信技术有限公司 | Time supply and synchronizing system for telecommunication network |
| CN101789627A (en) * | 2010-01-06 | 2010-07-28 | 江苏方天电力技术有限公司 | High-precision Ethernet timing device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109379157A (en) * | 2018-11-23 | 2019-02-22 | 国网上海市电力公司 | The high-precision substation clock synchronization apparatus eliminated based on clock jitter |
| CN112148065A (en) * | 2019-06-28 | 2020-12-29 | 华为技术有限公司 | Time synchronization method and server |
| CN110673466A (en) * | 2019-10-18 | 2020-01-10 | 济南启天电子有限公司 | Time server |
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Application publication date: 20170517 |
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