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An introduction of No.7 signal system in H 20-20

ZHANG Shao li(Mudanjing No.2 Power Plant,Mudanjiang 157015,China)  
There are a lot of applications of H 20-20 series digital programs control switch in electric power system. With the development of communication technology and continue increasing of communication operation,China NO.1 signal system can't satisfied with user's request, particularly when we build communication networks adopting digital relay,H 20-20 series digital programs control switch will be applied abroadly.
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