A Fault Prognosis Strategy Based on Time-Delayed Digraph Model and Principal Component Analysis

Table 1

Description of process variables.

Number	Variables	Descriptions	Units
1	PDI_1	Resistance of the lower tower	KPA
2	LIAS_2	Liquid oxygen level of condenser evaporator	MM
3	AI_701	Argon content of the argon fraction	%
4	TI_16	Temperature of the argon fraction	DEGC
5	PDI_701	Resistance of CAC I	MPA
6	PIS_701	Outlet pressure of CAC II	MPA
7	PDI_702	Resistance of CAC II	KPA
8	FI_702	Flow rate of the argon fraction	M3/HR
9	LIC_701	Liquid air level of condenser	MM
10	AI_705	Argon content of the crude argon gas	%