Protective system for an installation and a method for checking a protective system
AssigneeSiemens Aktiengesellschaft
InventorsJörg Bröse, Michael Knörlein
Life of this patent
Estimating the term…
Abstract
The invention relates to a protective system for an installation, in particular for a gas-turbine installation, in which all the fail-safe protective circuits with reaction time requirements of greater than 50 milliseconds are routed via a more fail-safe programmable logic automation system. For all the other protective circuits with reaction time requirements of less than 50 milliseconds, fail-safe control relays are connected in a configuration which is tolerant to single faults, in which the automation system can check the operation of the control relay circuit cyclically during operation of the installation.
Claims20
A protective system for an installation, comprising:
- an automation system with
- a plurality of signal inputs that receive operating signals, to be monitored, of first operating parameters of the installation, and
- a plurality of signal outputs, wherein a portion of the signal outputs are for indirect control of the installation;
- a load control unit whose input side is coupled to the signal outputs and whose output side is coupled via a tripping line to an actuating element;
- and
- a control relay circuit having a control relay where the operating signals of further operating parameters are passed to the load control unit, and wherein the control relay circuit is checked by the automation system.
A method for checking a control relay circuit in a protective system by an automation system in a protective system, comprising:
- checking that a tripping line, which is not connected downstream from a closed-circuit line which is currently intended to be checked, to determine whether the tripping line is supplying electrical voltage to an actuating element;
- producing a test signal by the automation system at t=0 seconds by means of one of control relays for the closed-circuit line which is intended to be checked if the actuating element is being supplied with electrical voltage;
- recording a signal profile of the closed-circuit line or a signal profile of the tripping line by the automation system;
- and
- determining a state of the control relay circuit by the automation system by assessment of the recorded signal profile over time.
Dependencies are inferred from the claim text.