초록 ▼

A tripping control system for use with, for example, turbines, includes a block circuit having two or more redundant blocking valves disposed or connected in series within a pressure supply line to block the supply of hydraulic fluid within the pressure supply line and a bleed circuit having two or

A tripping control system for use with, for example, turbines, includes a block circuit having two or more redundant blocking valves disposed or connected in series within a pressure supply line to block the supply of hydraulic fluid within the pressure supply line and a bleed circuit having two or more bleed valves connected in parallel between the pressure supply line and a return or dump line to bleed to the hydraulic fluid from the pressure supply line. The blocking valves and the bleed valves are actuated by one or more control valves under the control of a process or safety controller which trips the turbine by first performing a bleed function using the bleed valves, which then causes the block function to automatically actuate. Pressure sensors disposed at various locations in the tripping control system provide feedback to the controller to enable the controller to test each of the block and bleed valves individually, during operation of the turbine, without causing an actual trip of the turbine. The tripping control system thereby provides reliable trip operation during a trip by providing redundant block and bleed functionality in combination with enabling the individual components of the block and bleed circuits to be tested while the turbine is online and operating but without preventing the turbine from being tripped, if necessary, during the test.

대표청구항 ▼

What is claimed is: 1. A trip control system for controlling the operation of a controlled device using fluid pressure delivered from a fluid pressure source to an input of the controlled device, comprising:a fluid pressure line adapted to be connected between the fluid pressure source and the input

What is claimed is: 1. A trip control system for controlling the operation of a controlled device using fluid pressure delivered from a fluid pressure source to an input of the controlled device, comprising:a fluid pressure line adapted to be connected between the fluid pressure source and the input of the controlled device, the input of the controlled device being a control input that controls the controlled device to move between a first state and a second state when a pressure at the input exceeds a certain amount, wherein the first state is one of an opened or a closed state, and the second state is the other of the opened or the closed state;a low pressure fluid return line;a bleed circuit having a bleed valve system hydraulically and directly coupled between the fluid pressure line and the low pressure fluid return line, the bleed circuit disposed upstream of the input of the controlled device and the bleed valve system operable to hydraulically and controllably connect the fluid pressure line to the low pressure fluid return line to reduce the fluid pressure within the fluid pressure line; anda block circuit disposed at least partially in the fluid pressure line upstream of the bleed circuit and coupled to the low pressure fluid return line, the block circuit including:a first valve and a second valve disposed in series in the fluid pressure line, the first and the second valve each operable to completely block the fluid pressure line; andfirst and second electronically controlled actuators hydraulically coupled to the first and second valves to control the operation of the first and second valves, the first and second electronically controlled actuators adapted to receive control signals to control the operation of the first and second valves.