PROTECTION SYSTEM FOR TRANSFERRING TURBINE AND STEAM GENERATOR OPERATION TO A BACKUP MODE ESPECIALLY ADAPTED FOR MULTIPLE COMPUTER ELECTRIC POWER PLANT CONTROL SYSTEMS

摘要

ABSTRACTAn electric power plant including a steam gener-ator and a steam turbine is operated by a control systemincluding two redundant digital computers. Switching cir-cuitry is provided for coupling one of the computers throughinterface equipment to the steam generator and the turbineand a generator according to programmed computer control. Adata link is established between the computers to transfermanual/automatic status and other needed data from the controlcomputer to the standby computer. A system is provided fordetecting when certain hardware and software malfunctionshave occurred and for responsively transferring control tothe standby computer. The standby computer is tracked tothe control computer so that control computer transfer canbe made reliably without disturbing the electric powergeneration process. The detection system triggers computertransfers in the event malfunctions occur in input/outputequipment including contact closure input and output systemsand analog input and output systems. Computer transfers arealso triggered on certain software malfunctions includingtight loop operation and prescribed task errors. Certainother events such as a data link malfunction permit a com-puter transfer but limit the computer coming into controlstatus to the manual mode.