Plant operation data monitoring apparatus

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.