• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Systems and methods for detecting the failure of a precision time source using an independent time source are disclosed. Additionally, detecting the failure of a GNSS based precision time source based on a calculated location of a GNSS receiver is disclosed. Moreover, the system may be further configured to distribute a time derived from the precision time source as a precision time reference to time dependent devices. In the event of a failure of the precision time source, the system may be configured to distribute a time derived from a second precision time source as the precision time signal during a holdover period.
    公开号:ES2547028A2
    申请号:ES201590031
    申请日:2013-10-17
    公开日:2015-09-30
    发明作者:V. ACHANTA Shankar；E. WHITEHEAD David；Henry Loehner
    申请人:Schweitzer Engineering Laboratories Inc；
    IPC主号:
    专利说明:

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    P201590031
    07-08-2015
    program, functions and / or instructions that are executable by computer / s to perform tasks such as those described in this document. The appropriate software, as applicable, can easily be provided by experts in the relevant technique (s) using the teachings presented in this document and languages and
    5 programming tools, such as XML, Java, Pascal, C ++, C, database languages, API, SDK, assembler, firmware, microcode, and / or other languages and tools. A precision time reference refers to a time signal or time source, upon which a plurality of devices depends and is distributed by a device of
    10 time distribution, and that is supposed to be more accurate than a local time source. Accuracy determination can be made based on a variety of factors. A precision time reference allows you to describe specific moments in time and temporarily compare them to each other. A source of time is any device that is capable of tracking the passage of time.
    15 A variety of types of time sources are contemplated, including a temperature-compensated and voltage-controlled crystal oscillator (VCTCXO), an oscillator with a phase-locked loop, an oscillator with a time-locked loop, a rubidium oscillator , a cesium oscillator, a trained oscillator, a microelectromechanical device (MEM), and / or another device capable of tracking the passage of time.
    20 A time signal is a representation of the time indicated by a time source. A time signal can constitute any form of communication to communicate time information. A wide variety of types of time signals are contemplated, including an Inter-Range Instrumentation Group (IRIG) protocol, a global satellite navigation system (GNSS, such as, for example, the positioning system
    25 global (GPS), GLONASS, or the like), a radio broadcast such as a broadcast from the National Institute of Science and Technology (NIST) (for example, WWV, WWVB and WWVH radio stations), the IEEE 1588 protocol, a network time protocol (NTP) encoded in RFC 1305, a simple network time protocol (SNTP) in RFC 2030, and / or another protocol
    or time transmission system. This document can be used
    30 regardless of time source and time signal. The failure of a precision time source and / or a precision time signal, as used herein, includes impersonation and / or signal interference, mechanical or software failures, general system shutdowns, etc. . Additionally, the features, operations or features described can be combined
    35 in any suitable manner in one or more embodiments. It will also be understood
    10
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    Precision time reference with accuracy greater than one millisecond to allow time-aligned comparisons. According to various embodiments, a time synchronization with an accuracy of the order of the microsecond or nanosecond can allow IEDs to make exact synchrophasor comparisons.
    5 Figure 2 illustrates a system 200 configured to be a highly reliable, redundant and distributed system of time distribution devices 204, 206 and 208 capable of providing a precision time reference to various time dependent IEDs 212, 214 and 216. Each time distribution device 204, 206 and 208 may be configured to receive and communicate time signals across multiple
    10 protocols and procedures. Although system 200 is described as capable of performing numerous procedures and functions, it should be understood that various systems may have more or less capabilities. Specifically, a system 200 can operate as desired using a single protocol, or having fewer external or local time signal inputs.
    15 As illustrated in Figure 2, three time distribution devices 204, 206 and 208 have WAN capabilities and are communicatively connected to a WAN 218, which may comprise one or more physical connections and protocols. Each time distribution device 204, 206 and 208 may also be connected to one or more IEDs within a local network. For example, time distribution device 204 is
    20 connected to the IED 212, the time distribution device 206 is connected to the IEDs 214, and the time distribution device 208 is connected to the IEDs 216. A time distribution device may be located, for example, in a power generation plant, a distribution center, a substation, a load center, or other location where one or more FDI is located. In various embodiments
    25 an IED can include a WAN port, and such IED can be connected directly to the WAN
    218. IEDs can be connected via WAN 218 or connection 210. Connection 210 can be, for example, a local area network (LAN) or a dedicated time communication link, such as a communication link Inter-Range Instrumentation Group (IRIG) contingent. In various embodiments, connection 210 may include multiple connections, for example, both a LAN connection and an IRIG. The time distribution devices 204, 206 and 208 can establish and maintain a precision time reference between various system components. Each time distribution device 204, 206 and 208 may be configured to communicate time information with the IEDs connected by the connection 210 through one or more procolos of
    35 time distribution, such as IEEE 1588.
    12
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    权利要求:
    Claims (1)
    [1]
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    类似技术:
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    CN110308466A|2019-10-08|Miniature dual mode receiver and its air navigation aid based on Zynq-7020
    CN110515109A|2019-11-29|A kind of method and device merging the autonomous PNT time based on multiple information sources
    Yi et al.2016|Remote time and frequency transfer experiment based on BeiDou common view
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    同族专利:
    公开号 | 公开日
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    US20140114608A1|2014-04-24|
    MX2015004133A|2015-07-06|
    ES2547028R1|2015-12-02|
    CA2886762A1|2014-04-24|
    AU2013331191A1|2015-04-09|
    US9760062B2|2017-09-12|
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    US20170351223A1|2017-12-07|
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    法律状态:
    2016-07-05| FC2A| Grant refused|Effective date: 20160629 |
    优先权:
    申请号 | 申请日 | 专利标题
    US201261716397P| true| 2012-10-19|2012-10-19|
    US61/716,397|2012-10-19|
    US14/056,170|2013-10-17|
    PCT/US2013/065447|WO2014062924A1|2012-10-19|2013-10-17|Time distribution device with multi-band antenna|
    US14/056,170|US9760062B2|2012-10-19|2013-10-17|Time distribution with multi-band antenna|
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