Table 1: Life-span of new electro-mechanical equipment in years: Values for estimated life-span are based on regular maintenance, availability of spare parts, and qualified personnel

Equipment Typical life-span of new components
Shut down vlave 60 years
Turbine stationnary parts 50
Turbine Governor 30
Generator 40
Exciter machine 40
MV switchgear 35
LV switchgear 35
Auxiliary transformer 40
Battery systems 20
Battery chargers 25
Cables 50
Generator protection 20
Voltage regulator 20
Synchronisation 20
Unit control system 20
Plant control system 20
Emergency diesel 50
Step up transformer 50
HV switchyard 45