Beidou and electric power, grid clock reference urgently needs high-precision Beidou timing service
Beidou and electric power, grid clock reference urgently needs high-precision Beidou timing service
1. Why use Beidou clock synchronization reference?
由于历史的原因,我国目前的电力行业的时间同步系统的时钟源大都采用米国GPS系统做为主时钟源。 目前，GPS是米国军方控制的军民共用的系统，对全世界开放。我国目前使用的GPS属于免费接收的米国信号。尽管如此，但是米国人并不承诺保证你的使用。这样就带来一个安全问题, 如电力系统以米国的GPS作为主时钟源，这便存在着重大的安全隐患，一旦发生战争等紧急事态，米国关闭或调整GPS信号，将给我们的电力生产带来很大影响。
如何建立完善的时间同步机制,同时使电力系统时间同步系统不受他国控制,是摆在电力行业面前的一大课题｡北斗时钟同步装置就是在这种情况下应运而生的，为了保障我国电力系统的生产、运行安全，北斗双模时钟同步装置同时接收GPS和北斗两个不同卫星系统的标准时间信息，当其中一个系统接收故障或者信号异常时，可以自动切换到另外一个另外一个授时系统，保证上游时间源的稳定接收，由于北斗卫星导航定位系统是由我国自主开发的，相对于GPS系统来说，在安全性上也更有保障。
2. How to help you choose the appropriate clock synchronization device
目前在时钟同步应用中同时并存着不同类型的设备，通过对一些技术资料的调查，这里把其中普遍承认的各种设备的主要特点说明如下：
2.1、可以同时兼容接收GPS和北斗两种卫星时间信号，可以设定任意一种卫星时间信号作为主时间源，当主时间源出现故障时或者信号异常时，系统自动识别误码并切换到备用时间信号源接收，倒换时间小于50MS，倒换时带有蜂鸣告警，无需人工手动干预。有的设备不能自动倒换，需要人工干预，这类设备在自动化程度越来越高的电力行业并不适用。
2.2 、系统采用模块式组合，主要优点是可以保证在不同的应用场合，针对使用需求可以任意配置PPS/PPM/PPH，IRIG-B接口，RS232/422/485，NTP,PTP等接口的类型和数量。
2.3、主控板和电源系统是否采用双备份的方式，是不是支持卫星丢失状态下时钟信号自我保持精度在24小时内误差小于10MS，当整个系统外部电源中断时，是否支持24小时自动续航。以上设计方式可以最大限度保障时钟信号基准的稳定安全输出，在极限情况下，也可以保障系统的正常运行。
2.4、所有插件均支持热插拔，该功能的好处是在维护和更换其中部分设备时不需要把整个时钟系统的电源关闭，维护或者更换配件的过程整个系统仍然可以稳定运行。
Beidou satellite timing service
detection example
It was applied to Xinjiang Turpan Electric Power Bureau and Xinjiang Aksu Electric Power Company on May 5, 2008. It is mainly used for clock synchronization and unified dispatch of the whole station. It has received unanimous praise, provided help for scientific research topics, and provided a strong reference basis for the post-analysis of equipment failures and the judgment of power grid breakpoints.
On August 25, 2009, through strict equipment insulation performance, heat and humidity resistance, mechanical performance, environmental performance, electromagnetic compatibility, reliability, maintainability, and safety testing, India’s IMFA 30MW power station officially selected the GPS clock synchronization system device ( Reserve the Beidou extension interface), and successfully reference the fault recorder and the clock synchronization of each unit.
On October 20, 2010, Hunan Shaoshan Electric Power Co., Ltd. chose this series (clock synchronization system) as the reference signal source for the clock synchronization of the whole station through a comprehensive comparison of product cost-effectiveness. The acceptance results showed that all indicators were met or due to the requirements of use .
In Shaoshan, according to the comparison of the overhaul team leader, the accuracy of our company’s instrument is the same as the original imported clock synchronization device he used (originally bought 400,000), the response time is the same, and the accuracy is the same. The price/performance ratio of this instrument is even more advantageous.