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一、过速限制系统的动作条件葛洲坝二江分厂安装有五台ZZ500-LH-1020型转桨式水轮机,额定转速62.5转/分;配置JCST-200型电液调速器.除了调速器的正常控制、保护以外,还设计有过速限制系统,作为机组过速的一种保护.过速限制系统的原理图如图一所示,它由事故配压阀12、差动阀11、切换阀4、电磁配压阀3,9、液压阀5和备用油源(事故油罐)1等组成.它的动作条件是:
First, over-speed limit system operating conditions Gezhouba Erjiang plant installed five ZZ500-LH-1020 Kaplan turbine, rated speed of 62.5 rev / min; configuration JCST-200 electro-hydraulic governor.In addition to speed In addition to the normal control and protection of the device, a over-speed limit system is also designed as a protection for the over-speed of the unit, and the schematic diagram of the over-speed limit system is shown in Figure 1. It consists of an accident pressure regulating valve 12 and a differential valve 11 , Switching valve 4, electromagnetic pressure regulating valve 3, 9, hydraulic valve 5 and spare oil source (accident tank) 1, etc. Its operating conditions are: