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对于原子能反应堆和大型石油、化工企业，联锁保护系统是保证经济、安全生产的关键。因分一旦出事、轻者造成巨大的经济损失。重者将造成无法预测的灾难。严重时甚至涉及到政治和外交领域。所以联锁保护系统的可靠性历来为世人注目。多年来，许多人在不断地探索提高可靠性的办法，设法提高和解决此问题。为此，各种办法应运而生。
For nuclear reactors and large oil, chemical companies, interlocking protection system is to ensure economic and safety of the key. As a result of sub-incident, the light caused huge economic losses. Heavy people will cause unpredictable disaster. Serious even when it comes to political and diplomatic areas. Therefore, the reliability of interlock protection system has always been the world’s attention. Over the years, many people are constantly exploring ways to improve reliability and trying to raise and resolve this issue. To this end, a variety of ways came into being.