Plant diagnostic apparatus

• US 5,101,337 A
• Filed: 11/07/1989
• Issued: 03/31/1992
• Est. Priority Date: 11/09/1988
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Ebizuka, Kiyoshi
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): BROWN, THOMAS
• Application Number:
  US07/432,863
• Time in Patent Office: 875 Days
• Field of Search: 364/149, 364/150, 364/550, 364/578, 364/492, 364/493, 364/494, 364/495, 364/184-187
• US Class Current: 700/79
• CPC Class Codes: G05B 17/02 electric
• CPC Class Codes: G05B 23/0245 based on a qualitative model, e.g. rule based; if-then decisions
• CPC Class Codes: G05B 23/0275 Fault isolation and identification, e.g. classify fault; estimate cause or root of failure
• CPC Class Codes: G05B 23/0286 Modifications to the monitored process, e.g. stopping operation or adapting control

Abstract

A plant diagnostic apparatus for determining the cause of a fault in a power plant or the like displays a simulation fault value based on an estimated fault and therefore the diagnostic probability of the displayed cause of the fault to be the correct cause can be improved. Moreover, since an estimated fault, a fault period simulation value of the case that an estimated fault progresses and a normal period simulation value of the case that no fault occurs are displayed on the same screen, a simulation value of the estimated fault and normal value can be compared for judgment and thereby the diagnostic probability of the correctness of the decision of the estimated fault can be improved. In addition, since an estimated fault, a simulation value due to the estimated fault and a simulation value of the case that a counter measure is taken to correct the estimated fault are displayed on the same screen, the probability of the decision of the estimated fault being correct can be improved by comparing these values.

Claims

1. A plant diagnostic apparatus for determining a cause of a fault in a power plant or the like, comprising:

a plant characteristic model for storing plant characteristics;

input processing means for inputting data from the plant;

a plant transition data file for storing transition values of plant characteristics based on data from the input processing means;

fault detecting means for detecting a fault in the plant based on the data from said input processing means;

cause estimating means for estimating a cause of the fault from a fault event detected by the fault detecting means;

cause estimating image generating means for generating an image to be displayed by the data from the cause estimating means;

fault period simulation control means for calculating an estimated fault simulation value based upon the data from the plant characteristic model, from the plant transition data file and from the cause estimating means;

simulation image generating means for generating an image of the simulation value calculated by the fault period simulation control means;

display processing means for displaying and controlling the images generated by the simulation image generating means and by the cause estimating image generating means; and

a display unit for displaying the estimated fault and the estimated fault simulation value under the control of said display processing means.

2. A plant diagnostic apparatus for determining a cause of a fault in a power plant or the like, comprising:

a plant characteristic model for storing plant characteristics;

input processing means for inputting data from the plant;

a plant transition data file for storing transition values of plant characteristics based on data from the input processing means;

fault detecting means for detecting a fault in the plant based on the data from said input processing means;

cause estimating means for estimating a cause of the fault from a fault event detected by the fault detecting means;

cause estimating image generating means for generating an image to be displayed by data from the cause estimating means;

normal period simulation control means for calculating a normal period simulation value in the absence of a fault based on the data from the plant characteristic model, from the plant transition data file and from the cause estimating means;

fault period simulation control means for calculating an estimated fault simulation value based on the data from the plant characteristic model, from the plant transition data file and from the cause estimating means;

simulation image generating means for generating an image of the simulation values calculated by the fault period simulation control means and by the normal period simulation control means respectively;

display processing means for displaying and controlling the images generated by the simulation image generating means and by the cause estimating image generating means; and

a display unit for displaying the estimated cause of the fault, the normal period simulation value and the simulation value due to the estimated fault under the control of the display processing means.

3. A plant diagnostic apparatus for determining a cause of a fault in a power plant or the like, comprising:

a plant characteristic model for storing plant characteristics;

input processing means for inputting data from the plant;

a plant transition data file for storing transition values of plant characteristics based on data from the input processing means;

fault detecting means for detecting a fault in the plant based on the data from said input processing means;

cause and measure estimating means for estimating a cause and a counter measure to be taken based on a fault event detected by said fault detecting means;

cause estimating image generating means for generating an image to be displayed by data from the cause and measure estimating means;

fault/measure simulation control means for calculating a simulation value of a case where the estimated counter measure is taken for the estimated fault based on the data from the plant characteristic model, from the plant transition data file and from the cause and measure estimating means;

simulation image generating means for generating an image to be displayed by the data from the fault/measure simulation control means;

display processing means for displaying and controlling the images generated by the simulation image generating means and by the cause estimating image generating means; and

a display unit for displaying the estimated cause of the fault and the fault measure simulation value under the control of the display processing means.