西班牙专利ES2552829A2 Time distribution switch

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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:ES2552829A2
申请号:ES201590030
申请日:2013-10-18
公开日:2015-12-02
发明作者:E. WHITEHEAD David；V. ACHANTA Shankar；Henry Loehner
申请人:Schweitzer Engineering Laboratories Inc；
IPC主号:

专利说明:

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a cesium oscillator, a trained oscillator, a microelectromechanical device (MEM), and / or another device capable of tracking the passage of time. 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
5 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 global positioning system (GPS) , GLONASS, or the like), a radio broadcast such as a broadcast from the National Institute of Science and Technology (NIST) (for example, WWV radio stations,
10 WWVB and WWVH), 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. In this document, time source and time signal can be used interchangeably. The failure of a precision time source and / or a precision time signal, such as
15 used herein, includes impersonation and / or signal interference, mechanical or software failures, general system shutdowns, etc. Additionally, the features, operations or features described may be combined in any suitable manner in one or more embodiments. It will also be easily understood that the order of the stages or actions of the procedures described in relation
20 with the embodiments described herein can be changed, as will be apparent to those skilled in the art. Thus, any order in the drawings or in the detailed description is for illustrative purposes only and does not mean that it implies a required order, unless the need for an order is specified. Figure 1 illustrates a single-line diagram of an electric power supply system 10.
25 The delivery system 10 includes intelligent electronic devices (IEDs) 102, 104 and 106 that use a precision time reference to monitor, protect and / or control system components. The electric power supply system 10 illustrated in Figure 1 includes three geographically separate substations 16, 22 and 35. Substations 16 and 35 include generators 12a, 12b and 12c. Generators
30 12a, 12b and 12c generate electricity at a relatively low voltage, such as 12 kV. The substations include lifting transfomers 14a, 14b and 14c to raise the voltage to an appropriate level for transmission. The substations include several circuit breakers 18 and bars 19, 23 and 25 for the adequate transmission and distribution of electrical energy. Electric power can be transmitted over long distances using
35 transmission lines 20a, 20b and 20c. Substations 22 and 35 include reducing transformers 24a, 24b and 24c for
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reduce the electrical energy to a level suitable for distribution to several loads 30, 32 and 34 using distribution lines 26, 28 and 29. In substations 16, 22 and 35, IEDs 102, 104 and 106 configured to protect are illustrated , control, measure and / or automate certain equipment or devices of the system
5 energy According to several embodiments, numerous IEDs are used in each substation; however, for clarity only one FDI is illustrated in each substation. IEDs 102, 104 and 106 may be configured to perform various time-dependent tasks that include, but are not limited to, monitor and / or protect a transmission line, a distribution line and / or a generator. Other FDI included in the substation may be
10 configured as bar protection relays, distance relays, communication processors, automation controllers, transformer protection relays, and the like. Since each IED or group of IEDs can be configured to communicate over a local area network (LAN) or a wide area network (WAN), each IED or group of IEDs can be considered a node of a communications network.
15 As indicated above, an FDI can be configured to calculate and communicate synchrophasors with other FDI. In order to compare exactly the synchrophasors obtained by geographically separated FDI, it is necessary to synchronize each FDI with a precision time reference with accuracy greater than one millisecond to allow time-aligned comparisons. According to various embodiments, a synchronization of
20 times with an accuracy of the order of the microsecond or nanosecond can allow FDI to make exact synchrophasor comparisons. 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 dependent IEDs
25 of time 212, 214 and 216. Each time distribution device 204, 206 and 208 may be configured to receive and communicate time signals through multiple 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 function as
30 is desired using a single protocol, or having fewer external or local time signal inputs. 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 device of
Time distribution 204, 206 and 208 may also be connected to one or more IEDs within a local network. For example, time distribution device 204 is
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As a second time source, one skilled in the art will recognize that other time sources, such as those described above, may be used instead of the WWVB broadcast. In 406 the time quality module compares the first time signal with the second time signal. Each of the time signals received by the quality module of
5 time has an inherent error limit related to the accuracy of the time signal. In one embodiment, the time quality module compares the time signals relative to their respective error limits to determine if the first time source has failed. For example, given the relatively lower error limit found in the time derived from a GNSS signal compared to that found in a time derived from a
10 WWVB broadcast, the time based on the GTNSS signal should fall within the time error limit based on the WWVB broadcast. However, if the GNSS-based time signal falls outside the error limit of the WWVB-based time signal, the time quality module detects, at 408, that there is an error with the GNSS-based time signal.
15 If, at 408, the time quality module determines that the first time source has not failed, the time quality module distributes the time from the first time signal as a precision time reference at 410. Yes, in 408, the time quality module determines that the first time source has failed, in 412 the time quality module alerts a user that the best available time source has failed and that
20 that the time may not be accurate. In addition to alerting a user of the failure, the time quality module can determine in 414 a better available time source and in 416 distribute the best available time source as a precision time reference. The process to determine the best available time source is described in greater detail below with reference to Figure 7.
25 Although the example in Figure 4 is limited to a first and second time signals, the time quality module can continue comparing time signals in order of relative error limits beyond a first and second time signals. . For example, the WWVB-based time can be compared with the time of a local oscillator (taking into account the oscillator deviation rate) to determine if the
30 WWVB source has failed, etc. Figure 5 illustrates a second embodiment to determine if a main source has failed
or the best available. Although the time signals in the example of Figure 5 are described as specific signals, other signals with similar results can be used. In 502 the time distribution device receives a first time signal from a
The first time source, or best available time source, and provides the time signal to the time quality module. In one embodiment, the first source of time is
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权利要求:
Claims (1)
[1]
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类似技术:

公开号 | 公开日 | 专利标题

ES2552829A2|2015-12-02|Time distribution switch

ES2565702B1|2018-07-04|QUALITY OF PRECISION TIME SOURCES

ES2523703B1|2016-09-02|SYSTEMS AND METHODS FOR SYNCHRONIZATION OF FDI TIME BY RADIO LINK

ES2547028A2|2015-09-30|Time distribution device with multi-band antenna

US9319100B2|2016-04-19|Delay compensation for variable cable length

US8812256B2|2014-08-19|System and apparatus for measuring the accuracy of a backup time source

CN106461787B|2020-05-05|Verification and distribution of time signals

US20150364953A1|2015-12-17|Adaptive Holdover Timing Error Estimation and Correction

MX2015004152A|2015-07-06|Manipulation resilient time distribution network.

CN103163780A|2013-06-19|Power network global position system |big dipper dual system satellite synchronous clock system

CN103036314A|2013-04-10|Inserted electricity parameter sampling realization device based on time-base signals of compass navigation satellite system and global position system |

US9948420B2|2018-04-17|Voting scheme for time alignment

US10527732B2|2020-01-07|Verification of time sources

CN204389571U|2015-06-10|The multi-clock synchronization vector measurement device of the absolute built-in potential of generator can be measured

Gutiérrez Rivas2019|Dependable systems over synchronous networks

Zhao et al.2013|Design of time synchronization system based on GPS/BeiDou satellite

CN105162544A|2015-12-16|System time keeping method based on SDH network

同族专利:

公开号 | 公开日

AU2013331048A1|2015-04-09|

MX2015004131A|2015-07-06|

WO2014063058A1|2014-04-24|

ES2552829R1|2016-06-03|

US20140111249A1|2014-04-24|

ES2552829B1|2017-03-23|

CA2885784A1|2014-04-24|

US9520860B2|2016-12-13|

US20170063482A1|2017-03-02|

BR112015008592A2|2017-07-04|

US10122487B2|2018-11-06|

引用文献:

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

US5160926A|1989-06-28|1992-11-03|Schweitzer Engineering Laboratories, Inc.|Display transducer apparatus|

WO1994005117A1|1992-08-14|1994-03-03|Dtmf Television, Inc.|A participatory television system|

US6694270B2|1994-12-30|2004-02-17|Power Measurement Ltd.|Phasor transducer apparatus and system for protection, control, and management of electricity distribution systems|

US5557284A|1995-02-03|1996-09-17|Honeywell Inc.|Spoofing detection system for a satellite positioning system|

US5959980A|1995-06-05|1999-09-28|Omnipoint Corporation|Timing adjustment control for efficient time division duplex communication|

US5737715A|1996-04-23|1998-04-07|Hughes Electronics|Frequency normalization utilizing GPS pulse time and time interval signal|

US5995911A|1997-02-12|1999-11-30|Power Measurement Ltd.|Digital sensor apparatus and system for protection, control, and management of electricity distribution systems|

US5873044A|1997-02-21|1999-02-16|Motorola, Inc.|Method and apparatus in a radio communication system for synchronizing transmissions while maintaining full user traffic|

US5914685A|1997-04-25|1999-06-22|Magellan Corporation|Relative position measuring techniques using both GPS and GLONASS carrier phase measurements|

JP3180735B2|1997-10-22|2001-06-25|松下電器産業株式会社|Wireless terminal with transmission timing correction function and method of manufacturing the same|

US6999440B2|1997-10-22|2006-02-14|Matsushita Electric Industrial Co., Ltd.|TDMA radio terminal capable of adjusting transmit timing by using measured delay time|

US6144334A|1998-02-26|2000-11-07|Analytical Graphics, Inc.|Method and apparatus for calculating access between satellite constellations and ground targets|

US6483856B1|1998-07-29|2002-11-19|Trimble Navigation Limited|GPS synchronized data communications link|

US6463092B1|1998-09-10|2002-10-08|Silicon Image, Inc.|System and method for sending and receiving data signals over a clock signal line|

US7375683B2|1999-03-05|2008-05-20|Era Systems Corporation|Use of geo-stationary satellites to augment wide— area multilateration synchronization|

DE19914600A1|1999-03-30|2000-10-05|Bosch Gmbh Robert|Synchronization method for orthogonal frequency division multiplexing radio receivers by inserting symbol sequence in data stream|

DE10013348A1|2000-03-17|2001-09-20|Abb Research Ltd|Time synchronization system for networks uses deterministic link with IRIG protocol distributes time from one clock|

DE1273112T1|2000-04-06|2003-05-28|Interdigital Tech Corp|SYNCHRONIZATION OF PROGRESSION AND DEVIATION|

US6716101B1|2000-06-28|2004-04-06|Bellsouth Intellectual Property Corporation|System and method for monitoring the location of individuals via the world wide web using a wireless communications network|

US6940931B2|2000-09-05|2005-09-06|Yamaha Corporation|Clock-synchronism evaluating apparatus and method|

GB2366971A|2000-09-13|2002-03-20|Marconi Comm Ltd|Bit and frame synchronisation|

US7196660B2|2000-11-17|2007-03-27|Global Locate, Inc|Method and system for determining time in a satellite positioning system|

US6472943B1|2000-12-21|2002-10-29|Telefonaktie Bolaget L.M. Ericsson|Oscillating circuit and method for calibrating same|

US7373175B2|2001-03-09|2008-05-13|Qualcomm Incorporated|Method and apparatus for timebase synchronization for use with cellular base stations|

US7092409B2|2001-03-21|2006-08-15|Telefonaktiebolaget Lm Ericsson |Timing distribution redundacy in a wireless network|

US20080186229A1|2001-06-06|2008-08-07|Van Diggelen Frank|Method and Apparatus for Monitoring Satellite-Constellation Configuration To Maintain Integrity of Long-Term-Orbit Information In A Remote Receiver|

GB2379581B|2001-09-11|2005-08-31|Nec Technologies|Apparatus and method of compensation for signal time-of-arrival variation in a UMTS handset|

US20030084190A1|2001-10-25|2003-05-01|Kimball Robert H.|Apparatus and system for maintaining accurate time in a wireless environment|

US6778136B2|2001-12-13|2004-08-17|Sirf Technology, Inc.|Fast acquisition of GPS signal|

DE10248052B4|2002-10-15|2009-12-24|Infineon Technologies Ag|Device and method for tracking a sampling time in radio receivers|

US7146516B2|2002-12-20|2006-12-05|Invensys Systems, Inc.|Time synchronization schemes wherein at least one data message associates a hardware pulse with a future time|

US7363009B2|2003-02-03|2008-04-22|Qualcomm Incorporated|Method and apparatus for determining propagation delays for use in wide area networks|

US7174133B2|2003-05-16|2007-02-06|Agilent Technologies, Inc.|Systems and methods for determining the delay offsets of communication systems|

US7272201B2|2003-08-20|2007-09-18|Schweitzer Engineering Laboratories, Inc.|System for synchronous sampling and time-of-day clocking using an encoded time signal|

US8138972B2|2003-09-02|2012-03-20|Csr Technology Inc.|Signal processing system for satellite positioning signals|

US7288779B2|2003-12-17|2007-10-30|Asml Netherlands B.V.|Method for position determination, method for overlay optimization, and lithographic projection apparatus|

US7266713B2|2004-01-09|2007-09-04|Intel Corporation|Apparatus and method for adaptation of time synchronization of a plurality of multimedia streams|

US7310064B2|2004-04-29|2007-12-18|Novariant Inc.|Rebroadcasting method and system for navigation signals|

US7398411B2|2005-05-12|2008-07-08|Schweitzer Engineering Laboratories, Inc.|Self-calibrating time code generator|

US7714735B2|2005-09-13|2010-05-11|Daniel Rockwell|Monitoring electrical assets for fault and efficiency correction|

US7372400B2|2005-11-07|2008-05-13|The Boeing Company|Methods and apparatus for a navigation system with reduced susceptibility to interference and jamming|

US20070132773A1|2005-12-08|2007-06-14|Smartdrive Systems Inc|Multi-stage memory buffer and automatic transfers in vehicle event recording systems|

US7617408B2|2006-02-13|2009-11-10|Schweitzer Engineering Labortories, Inc.|System and method for providing accurate time generation in a computing device of a power system|

US20070194987A1|2006-02-22|2007-08-23|Honeywell International Inc.|Systems and methods for a high-precision time of arrival ultra-wideband positioning system|

US7450069B2|2006-02-27|2008-11-11|Olympus Corporation Technology Of America|Ranging system and method|

US7606541B1|2006-04-12|2009-10-20|Nortel Network Limited|Enhanced holdover for synchronous networks employing packet switched network backhaul|

US7623068B2|2006-05-16|2009-11-24|Southwest Research Institute|Detection of deception signal used to deceive geolocation receiver of a satellite navigation system|

US7701923B2|2006-07-10|2010-04-20|Motorola, Inc.|Method and apparatus for frame synchronization in a communication network|

US8400353B2|2006-08-31|2013-03-19|Sige Semiconductor Limited|Apparatus and method for use in global position measurements|

US7920881B2|2007-05-15|2011-04-05|2Wire, Inc.|Clock synchronization for a wireless communications system|

KR100902601B1|2007-05-17|2009-06-12|한양네비콤주식회사|Wireless Time System And Method for Synchronizing Time|

JP5224727B2|2007-05-31|2013-07-03|株式会社東芝|DME ground equipment|

US7979228B2|2007-07-20|2011-07-12|The Regents Of The University Of Michigan|High resolution time measurement in a FPGA|

MX2010002163A|2007-09-28|2010-06-02|Schweitzer Engineering Lab Inc|Amplitude and phase comparators for line protection.|

WO2009055931A1|2007-11-02|2009-05-07|Novatel Inc.|System and method for distributing time and frequency over a network|

US20100253578A1|2007-11-25|2010-10-07|Mantovani Jose R B|Navigation data acquisition and signal post-processing|

US8116170B2|2007-12-19|2012-02-14|Seiko Epson Corporation|Timekeeping device and satellite signal reception method for a timekeeping device|

US8867520B2|2008-03-07|2014-10-21|Charles Nicholls|Using a network frequency reference to augment timing Synchronization in a wireless base station|

US7440427B1|2008-03-12|2008-10-21|Daniel A. Katz|Increasing channel capacity of TDMA transmitters in satellite based networks|

US8018950B2|2008-03-17|2011-09-13|Wi-Lan, Inc.|Systems and methods for distributing GPS clock to communications devices|

US8035558B2|2008-05-30|2011-10-11|The Boeing Company|Precise absolute time transfer from a satellite system|

US20090310570A1|2008-06-16|2009-12-17|Rivada Networks Llc|Method and Systems Providing Peer-to-Peer Direct-Mode-Only Communications on CDMA Mobile Devices|

JP4941775B2|2008-06-23|2012-05-30|Ｎｅｃエンジニアリング株式会社|Time synchronizer|

AU2009279802B2|2008-08-04|2016-05-19|Endace Technology Limited|Method and system for distributing clock signals|

US7986263B2|2008-09-22|2011-07-26|Sierra Wireless, Inc.|Method and apparatus for a global navigation satellite system receiver coupled to a host computer system|

CN107728169A|2008-11-04|2018-02-23|知维科技有限公司|For by the improvement of assistance alignment system|

US8159391B2|2008-11-13|2012-04-17|Ecole Polytechnique Federale De Lausanne |Method to secure GNSS based locations in a device having GNSS receiver|

US8035557B2|2008-11-24|2011-10-11|Andrew, Llc|System and method for server side detection of falsified satellite measurements|

US7940213B2|2008-11-24|2011-05-10|Andrew, Llc|System and method for determining falsified satellite measurements|

US8326319B2|2009-01-23|2012-12-04|At&T Mobility Ii Llc|Compensation of propagation delays of wireless signals|

US8237609B2|2009-02-22|2012-08-07|Trimble Navigation Limited|GNSS position coasting|

US8886205B2|2009-03-02|2014-11-11|Qualcomm Incorporated|Timing adjustment for synchronous operation in a wireless network|

US7986266B2|2009-03-13|2011-07-26|Andrew, Llc|Method and system for selecting optimal satellites in view|

WO2010115151A1|2009-04-03|2010-10-07|Schweitzer Engineering Laboratories, Inc.|Fault tolerant time synchronization|

US7978130B1|2009-05-01|2011-07-12|Coherent Navigation, Inc.|Practical method for upgrading existing GNSS user equipment with tightly integrated Nav-Com capability|

EP2800004A1|2009-05-20|2014-11-05|Chronologic Pty Limited|Synchronous network of superspeed and non-superspeed USB devices|

US7915962B2|2009-07-06|2011-03-29|Nortel Networks Limited|System and method for built in self test for timing module holdover|

US8082367B2|2009-07-23|2011-12-20|Schneider Electric USA, Inc.|Differential time synchronization of intelligent electronic devices|

US8275487B2|2009-08-10|2012-09-25|Schweitzer Engineering Laboratories, Inc.|Electric power system automation using time coordinated instructions|

US20110109506A1|2009-09-24|2011-05-12|Coherent Navigation, Inc.|Simulating Phase-Coherent GNSS Signals|

EP2348335A1|2010-01-22|2011-07-27|Astrium Limited|A receiver and method for authenticating satellite signals|

US8531332B2|2010-03-22|2013-09-10|Qualcomm Incorporated|Anti-spoofing detection system|

US7952519B1|2010-04-16|2011-05-31|John Nielsen|Method and system for detecting GNSS spoofing signals|

US8446896B2|2010-04-21|2013-05-21|Lsi Corporation|Time synchronization using packet-layer and physical-layer protocols|

US8624779B2|2010-05-18|2014-01-07|Trimble Navigation Limited|Global navigation satellite system reference station integrity monitoring and assurance|

US8718673B2|2010-05-21|2014-05-06|Maple Acquisition Llc|System and method for location assurance of a mobile device|

US8519763B2|2010-06-11|2013-08-27|Altera Corporation|Integrated circuits with dual-edge clocking|

US8578012B2|2010-07-02|2013-11-05|Schweitzer Engineering Laboratories Inc|Local intelligent electronic device rendering templates over limited bandwidth communication link to manage remote IED|

US8583957B2|2010-07-27|2013-11-12|National Instruments Corporation|Clock distribution in a distributed system with multiple clock domains over a switched fabric|

JP5576747B2|2010-09-06|2014-08-20|株式会社日立製作所|Communication system and time synchronization method|

US8812256B2|2011-01-12|2014-08-19|Schweitzer Engineering Laboratories, Inc.|System and apparatus for measuring the accuracy of a backup time source|

US8456353B2|2011-01-14|2013-06-04|Deere & Company|Method and system for determining clock corrections|

US8576778B2|2011-01-27|2013-11-05|Telefonaktiebolaget L M Ericsson |Transfer of synchronization in a hybrid global satellite packet network system|

US20120198267A1|2011-01-31|2012-08-02|Srinjoy Das|System and Method for Facilitating Data Transfer Between a First Clock Domain and a Second Clock Domain|

CN103502843B|2011-03-22|2015-05-20|天宝导航有限公司|GNSS signal processing with delta phase|

US9720095B2|2011-06-30|2017-08-01|Tufts University|System and method for wireless collaborative verification of global navigation satellite system measurements|

EP2756620A1|2011-09-12|2014-07-23|Continental Teves AG&Co. Ohg|Method and device for synchronizing network subscribers in an on-board network of a vehicle|

US9590411B2|2011-12-15|2017-03-07|Schweitzer Engineering Laboratories, Inc.|Systems and methods for time synchronization of IEDs via radio link|

US8583142B2|2012-03-16|2013-11-12|Qualcomm Incorporated|Selective distribution of location based service content to mobile devices|

US8564330B1|2012-06-05|2013-10-22|Xilinx, Inc.|Methods and systems for high frequency clock distribution|

US9348321B2|2012-06-29|2016-05-24|Finite State Research Llc|Method, time consumer system, and computer program product for maintaining accurate time on an ideal clock|

US9709680B2|2012-09-08|2017-07-18|Schweitzer Engineering Laboratories, Inc.|Quality of precision time sources|

US9369225B2|2012-10-01|2016-06-14|Intel Deutschland Gmbh|Distribution of an electronic reference clock signal that includes delay and validity information|

US9383735B2|2012-10-04|2016-07-05|Schweitzer Engineering Laboratories, Inc.|Distributed coordinated electric power delivery control system using component models|

US9400330B2|2012-10-19|2016-07-26|Schweitzer Engineering Laboratories, Inc.|Manipulation resilient time distribution network|

US9599719B2|2012-10-19|2017-03-21|Schweitzer Engineering Laboratories, Inc.|Detection of manipulated satellite time signals|

CA2886762A1|2012-10-19|2014-04-24|Schweitzer Engineering Laboratories, Inc.|Time distribution device with multi-band antenna|

CA2885784A1|2012-10-19|2014-04-24|Schweitzer Engineering Laboratories, Inc.|Time distribution switch|

US9083503B2|2013-05-02|2015-07-14|Schweitzer Engineering Laboratories, Inc.|Synchronized clock event report|

US9709682B2|2013-05-06|2017-07-18|Schweitzer Engineering Laboratories, Inc.|Multi-constellation GNSS integrity check for detection of time signal manipulation|

US9319100B2|2013-08-12|2016-04-19|Schweitzer Engineering Laboratories, Inc.|Delay compensation for variable cable length|

US9270442B2|2014-04-29|2016-02-23|Schweitzer Engineering Laboratories, Inc.|Time signal propagation delay correction|

US9425652B2|2014-06-16|2016-08-23|Schweitzer Engineering Laboratories, Inc.|Adaptive holdover timing error estimation and correction|US9709680B2|2012-09-08|2017-07-18|Schweitzer Engineering Laboratories, Inc.|Quality of precision time sources|

CA2885784A1|2012-10-19|2014-04-24|Schweitzer Engineering Laboratories, Inc.|Time distribution switch|

GB201320858D0|2013-11-26|2014-01-08|Univ Manchester|Method of determining an islanding solution for an electrical power system|

US10509130B2|2014-04-09|2019-12-17|The Mitre Corporation|Positioning, navigation, and timing device interference and spoofing detector with timing mitigation|

US9425652B2|2014-06-16|2016-08-23|Schweitzer Engineering Laboratories, Inc.|Adaptive holdover timing error estimation and correction|

WO2016003262A1|2014-07-02|2016-01-07|Mimos Berhad|A system and method for detecting global positioning system anomalies|

US9813173B2|2014-10-06|2017-11-07|Schweitzer Engineering Laboratories, Inc.|Time signal verification and distribution|

JP6365220B2|2014-10-20|2018-08-01|株式会社明電舎|Protection relay system and sampling synchronous monitoring method of protection relay system|

US10310091B2|2015-01-31|2019-06-04|Southwest Research Institute|GPS-based time stamp system|

US20170060101A1|2015-01-31|2017-03-02|San Diego Gas & Electric Company|Methods and systems for detecting and defending against invalid time signals|

US10474119B2|2015-09-15|2019-11-12|Rockwell Automation Technologies, Inc.|Industrial automation packaged power solution for intelligent motor control and intelligent switchgear with energy management|

US10303127B2|2015-09-15|2019-05-28|Rockwell Automation Technologies, Inc.|Apparatus to interface process automation and electrical automation systems|

US10375108B2|2015-12-30|2019-08-06|Schweitzer Engineering Laboratories, Inc.|Time signal manipulation and spoofing detection based on a latency of a communication system|

US20180109369A1|2016-10-14|2018-04-19|General Electric Technology Gmbh|Systems and methods for synchronizing time sources within a protection zone of a digital power substation|

CN106655124A|2016-12-30|2017-05-10|南华大学|Failure protection algorithm and apparatus for line circuit breaker|

US10527732B2|2017-02-09|2020-01-07|Schweitzer Engineering Laboratories, Inc.|Verification of time sources|

EP3462276A4|2017-08-04|2019-08-21|Shenzhen Goodix Technology Co., Ltd.|Timing method, clock device and terminal device|

US11099219B2|2018-03-26|2021-08-24|Oracle International Corporation|Estimating the remaining useful life of a power transformer based on real-time sensor data and periodic dissolved gas analyses|

US10887038B2|2018-09-28|2021-01-05|Samsung Electronics Co., Ltd.|GNSS-based multi-modal clock correction|

US10819727B2|2018-10-15|2020-10-27|Schweitzer Engineering Laboratories, Inc.|Detecting and deterring network attacks|

CN109696822B|2019-01-17|2021-01-01|西安电子科技大学|Time signal switching system and switching method|

EP3726678A1|2019-04-16|2020-10-21|ABB Power Grids Switzerland AG|Handling of lost time synchronization in a substation network|

法律状态:
2017-09-07| FA2A| Application withdrawn|Effective date: 20170901 |

优先权:

申请号 | 申请日 | 专利标题

US201261716310P| true| 2012-10-19|2012-10-19|

US61/716,310|2012-10-19|

US14/057,803|US9520860B2|2012-10-19|2013-10-18|Time distribution switch|

US14/057,803|2013-10-18|

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