Why do power automation systems need satellite synchronous clock devices?
Why do power automation systems need satellite synchronous clock devices?
With the rapid development of power automation, decentralized computer monitoring systems, water regime monitoring systems, video monitoring systems, condition monitoring systems, production information management systems...
Distributed equipment, relay protection device, fault recorder, PMU device, event sequence record SOE......
The functions are becoming more and more powerful, and the amount of data that needs to be collected and recorded is getting larger and larger. If the time for data collection and event recording is self-sufficient, then the time sequence will be unavoidable, which will cause great difficulties for data analysis and failure analysis , The establishment of the satellite synchronous clock system can provide an accurate, safe and reliable factory-wide clock source, and provide a unified time reference. The time of the satellite synchronous clock system needs to receive the time service of the earth orbit satellite.
At present, the main domestic use, China's Beidou satellite navigation system, the United States GPS global satellite navigation system, the Beidou satellite navigation system is a satellite navigation system built and operated independently by China, providing all-weather, all-weather, high-precision, positioning, National important space infrastructure for navigation and timing services is the preferred configuration.
Satellite synchronization clock system structure, basic time synchronization system, a master clock and signal transmission medium composition, master-slave time synchronization system, a master clock, multiple slave clocks, signal transmission medium composition, master-backup time synchronization system , Composed of two master clocks, multiple slave clocks, and signal transmission media, and also accepts Beidou satellite navigation system and GPS global positioning system
Used to synchronize the time of the time serviced equipment and system.
Commonly used time synchronization interfaces include pulse signal, active PPS or PPM, passive PPS or PPM, IRIB-B code, TTL DC B code, RS422/485 level DC B, AC B code, network time synchronization NTP/PTP, Serial time message RS232/RS485, DCF77, etc.
High-precision punctuality: In order to improve reliability, the clock is still required to output accurate time when the satellite signal is not received. At this time, a high-precision punctuality module is required. The punctuality module has different accuracy and adopts ordinary temperature compensation. The general accuracy of crystal oscillators has an error of about 100 milliseconds per day. The accuracy of the most commonly used constant temperature crystal oscillators has an error of approximately 1 millisecond per day. The accuracy of rubidium atomic clocks has an error of approximately 10 microseconds per day.