Any power system network (Figure 1) can be represented by a simplistic Thevenin's equivalent circuit (Figure 2). Using the Thevenin's equivalent circuit of the network, it will be very easy to calculate the fault current at any point of the the power system.
Figure 1 Power System Network
Figure 2 Thevenins Equivalent Circuit
where:
' '
From Figure 2, the fault current will be
Most faults are considered to be bolted faults thus , which will simplify the equation to
A Filipino Engineer, Registered Professional Engineer of Queensland (RPEQ) - Australia, and Professional Electrical Engineer (PEE 2574 - 1st Place April 1991) - Philippines with extensive experience in concept selection, front-end engineering, HV & LV detail design, construction, and commissioning of Hazardous and Non-Hazardous Area electrical installations in water and wastewater pipeline and pumping facilities, offshore platforms, hydrocarbon process plants and pipelines including related facilities. Hazardous area classification and design certification (UEENEEM015B, UEENEEM016B, UEENEEM017B).
'
'
, which will simplify the equation to
