公开(公告)号：US3643437A

公开(公告)日：1972-02-22

申请号：US3643437D

申请日：1969-10-16

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： BIRNBAUM MANFRED E ,  BRAYTENBAH ANDREW S ,  RICHARDSON ARTHUR W

IPC: F01D21/02 ,  F01K7/24 ,  F01K13/02 ,  F01K17/02

CPC classification number: F01D21/02 ,  F01K7/24 ,  Y02T50/671

Abstract: The disclosure relates to a steam turbine-driven electrical generating plant wherein a protection system is provided for preventing the turbines from reaching speeds which would result in damage to the turbines; such speeds resulting from a sudden partial or entire loss of the electrical load. A partial loss of the load is sensed by a comparison of the inlet pressure at the lower pressure turbine stages with the output power provided to the load. If the output power decreases according to a predetermined relationship and if the input pressure corresponds to a value above a predetermined percentage of rated load, the interceptor valve is closed for a predetermined period of time to stop steam flow between the steam reheating apparatus and the lower turbine stages and thereby to reduce turbine speed buildup during and up to the time that additional load is connected to the generator output. In the event of a total load loss, which is determined in the same manner as in the case of a partial loss of the load but with the additional criteria that the circuit breakers associated with the generator be opened, both the intercept valve and the main governor valve, which regulates the steam through the high-pressure turbine stages, are closed. Whenever the speed of the turbine generator exceeds a predetermined percentage of rated speed, an overspeed protection system maintains both the interceptor valve and the governor valve in a closed position and cooperates with the main governor valve control system to relieve steam pressure within the reheating apparatus.

Abstract translation: 本发明涉及一种蒸汽涡轮机驱动的发电设备，其中提供保护系统以防止涡轮机达到将导致涡轮机损坏的速度; 这种速度是由电负载的突然部分或全部损失引起的。 通过将低压涡轮级的入口压力与提供给负载的输出功率进行比较来检测负载的部分损失。 如果输出功率根据预定关系而降低，并且如果输入压力对应于高于额定负载的预定百分比的值，则拦截阀关闭预定时间段以停止蒸汽再加热装置与下部蒸汽加热装置之间的蒸汽流动 涡轮级，从而在附加负载连接到发电机输出的期间和之前降低涡轮机速度的积累。 在总负载损失的情况下，其以与负载的部分损失的情况相同的方式确定，但是具有与发电机相关联的断路器的额外标准被打开，拦截阀和主体 调节通过高压涡轮级的蒸汽的调节阀被关闭。 每当涡轮发电机的速度超过额定转速的预定百分比时，超速保护系统将拦截阀和调速阀都保持在关闭位置，并与主调节阀控制系统配合，以减轻再加热装置内的蒸汽压力。