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一、控制和保安系统 1.要求的裕度虽然通常希望用单路系统,但由于单路系统对运行时的试验和维修有一定的限制,这有害于电站的安全性和利用率,因而这种系统不一定总是能被采用的. 举例来说,I级保护中必须包括防止汽轮机超速的功能.所谓I级系指当发生不允许的超速时,汽轮机不仅应高度可靠地速关,还应防止产生系统的任何误停.上述要求可采用双路液动系统布置或二用其一的形式来达到.这
I. CONTROL AND SECURITY SYSTEMS 1. LIMITS REQUIRED While single systems are often desired, single systems have certain limitations on trial and maintenance during operation, which is detrimental to the safety and utilization of the plant and therefore For example, class I protection must include features that prevent the turbine from overspeeding, the so-called Class I means that the turbine should not only be shut off with a high degree of speed when impermissible overspeeds occur, but also The system should be protected against any erroneous stops. The above requirements can be achieved by using two-way hydraulics or one of two types.