Question

H. Describe briefly what is Touch Potential and Step Potential of a person.

Answer 1

When a fault occur in Electrical system Fault current flow from equipment to ground Because flow fault current potential difference created across this potential electrical Equipmement gradient can harm person in two ways > so 2) i) Touch potential of a person Touch potential is potential gradient between Finger of a raising hand touching faltity structure of Electric System and the feet of person standing on ground Touch potential should be very small that person should not get any shock even ground is carrying fault current It depend on resistance of human body stwhich is variable, and current pass body depend R of body Resistance of body = 100012 ii) Step potential step potential is potential difference between feet (step) of a person Standing on floor of stubstation, and spacing between one step is during Fault Current flow through the ground system 0.5m

fault structure 7 falut current OF ste High Resitivity soil Touch Potential Po 0.5m Teartch mat

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