An alarm method and system based on risk assessment

Abstract

The invention discloses an alarming method and system based on risk evaluation. The method includes the steps of: obtaining a risk variable; computing the status transition probability of the risk variable; computing the fault impact index of the risk variable; computing the time impact index of the risk variable; computing the risk index of the risk variable according to the status transition probability, the fault impact index and the time impact index; judging whether the risk index exceeds a risk alarming threshold, wherein the risk alarming threshold is the maximum risk value which the industrial system is capable of bearing; and if yes, sending an alarming signal. The method and system provided by the invention realizes real-time assessment and monitoring of a process risk status and is capable of effectively avoiding the situation that an operator can not handle process faults effectively and timely which is caused by alarm overflow, through establishing the risk variable and considering the three aspects of status transition probability, fault impact index and time impact index of the risk variable.

Description

technical field [0001] The invention relates to the technical field of industrial detection and alarm, in particular to an alarm method and system based on risk assessment. Background technique [0002] With the expansion of the scale of the industrial process and the increase of the complexity of the industrial process itself, the number of process variables has reached a considerable number. Due to the lack of scientific and effective methods for monitoring process variables, alarm flooding (the number of alarms exceeding the operator's handling capacity for a period of time) occurs from time to time. Once there is a flood of alarms, the operator will not be able to effectively analyze, judge and deal with the process failure in time, which will lead to serious consequences. [0003] In the prior art, patents related to fault diagnosis and alarm include CN104238545A "A Fault Diagnosis and Early Warning System for Petroleum Refining and Chemical Production Process and Its ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an alarm method and system based on risk assessment, which can obtain the risk index of all risk variables at the current moment and can clearly display the risk variable with the highest risk index, which is convenient for the operator to operate in a targeted manner and avoids excessive alarm parameters. For a long time, operators cannot effectively analyze, judge and deal with process failures in a timely manner

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