Absolute Time Synchronism Between Power System Fault Recorders and Sequence of Events Recorders
GEORGIA POWER COMPANY ATLANTA GA
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This paper addresses the problem of maintaining absolute real time synchronism between many remote transmission substation locations containing fault and sequence of events recording equipment. Several methods are described which have been under field evaluation for over five years and are in current use at Georgia Power Company. These methods include 1 utilizing a master time source for transmission via microwave of a time code data stream IRIG-B to selected remote locations. 2 utilizing the National Bureau of Standards 60 KHz transmission WWVB from Ft. Collins, Colorado to provide time data via commercial WWVB receivers. 3 utilizing the GOES satellite transmission to synchronize time data at selected locations via commercial GOES receivers. Advantages and disadvantages of each method are presented along with field data to support these methods. Synchronism to absolute real time provides a common time base for analyzing 1 system faults and disturbances recorded at many remote locations over a large geographical area with typically one millisecond resolution. This approach also allows the user to compare events and fault data between various I utilities where reference is made to absolute real time.
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