Korea Hydro Nuclear Power Co., Ltd.

Yong Hoon Park

Chi Yong Park

Young Sheop Park

Ji In Kim

Dae Woong Kim

Byoung Oh Lee

Yang Seok Kim

Jong Seog Kim

Bum Nyun Kim

Nam Woo Choi

Hyoung Kyun Kim

Hee Seung Chang

You Soo Shin

Ju Hyung Kang

Gun Woong Shin

Method for diagnosing a pneumatic control valve by using a positioner model includes: establishing relational expression for outputting valve stem displacement according to control pressure, the relational expression including parameters for the characteristics of a positioner, an actuator, and a valve, determining initial parameter value by adjusting the values of the parameters until the difference between a measured value for a normal operation of the pneumatic control valve and output value obtained by the relational expression is smaller than predetermined error limit, determining diagnostic parameter value by adjusting the values of the parameters until the difference between a measured value for a diagnostic operation of the pneumatic control valve and an output value obtained by the relational expression is smaller than a predetermined error limit, and comparing the initial parameter value and the diagnostic parameter value so as to determine whether the pneumatic control valve has abnormality.

Method and apparatus for diagnosing pneumatic control valve by using positioner model

The present invention provides a method for learning latest data considering external influences in an early warning system, and the early warning system for same. The method for learning latest data considering external influences comprises the steps of: an early warning processing device categorizing device monitored variables according to external influences; and the early warning processing device differently applying a pattern learning method for each of the categorized monitored variables.

Method for learning latest data considering external influences in early warning system and system for same

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Gyeongsangbuk-do, South Korea

Yong Hoon Park