Patent ID: 7680627

Claim:
A plant operation data monitoring apparatus comprising: plant-data inputting means for inputting plant data from a plant facility; a plant-data most-recent-value table for temporarily storing a most recent value of said plant data; plant-data recording means for retrieving said most recent value from said plant-data most-recent-value table and recording long-term time-series plant data in a plant data history table; monitoring point editing means for editing to register data regarding one or more monitoring points for monitoring an error of said plant facility in response to an operator request; a monitoring-point registering table for storing a result registered by said monitoring-point editing means; data-correlation determining means for selecting one or more main variable points having a strong correlation to the corresponding monitoring point from said plant-data history table using said monitoring point as a key; a main-variable-point registering table for registering a main variable point selected by said data-correlation determining means; limit calculating means for calculating to define a statistical upper/lower limit value function for said plant-data history table on the basis of time-series plant data of said monitoring point and said main variable point; a limit-value function table for storing a limit-value function defined by said limit-value calculating means; limit-value determining means for referring to table information in said limit-value function table and for periodically matching content of said plant-data most-recent-value table with the table information, and if the most recent value is outside the limit value range, deviation information due to a plant error is determined and stored in a determination result table; plant-error monitoring/outputting means for monitoring and outputting an error signal and content of said determination result table if a new plant error occurs; and a display device for displaying an output from said plant-error monitoring/outputting means.