隨著變電站自動(dòng)化技術(shù)的發(fā)展，對(duì)變電站內(nèi)時(shí)間的精確和統(tǒng)一提出了更高的要求。本文提出了一種采用IRIG-B時(shí)間碼來(lái)對(duì)時(shí)的方案。在這種對(duì)時(shí)方案中，每個(gè)變電站只安裝一個(gè)GPS接收裝置，利用RS422/485總線傳輸IRIG-B碼，保護(hù)裝置對(duì)IRIG-B碼解碼器后，來(lái)設(shè)置自己的時(shí)間。本文還詳細(xì)介紹了IRIG-B碼的概念和原理以及用CPLD實(shí)現(xiàn)IRIG-B碼解碼器的設(shè)計(jì)思想和實(shí)現(xiàn)方法。IRIG-B碼對(duì)時(shí)方式簡(jiǎn)化了回路設(shè)計(jì)，并且能夠可靠地提供精確的時(shí)間信息，必將在電力系統(tǒng)中得到廣泛的應(yīng)用。

　　Abstract:

　　With the progress of automatic technology in transformer substations， requirements for unified and accurate time in a substation are put forward. An economic and accurate scheme to synchronize time by using IRIG-B code is presented in the paper. In this scheme， only one GPS receiver is used in every substation， and the IRIG-B code is transmitted by RS422/485. After decoding the IRIG-B code， the protection device can set its own time. The concept and principle of IRIG-B code are explained， and the particular method of decode IRIG-B code by using CPLD is stated in detail. The way to synchronize time with IRIG-B code can simplify the circuit design，and provide accurate the information of time，which will be widely used in power system.

?