{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Typical substation grounding resistance is between 01

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: = 3.2 × 10 m (i.e., a radius of about 1000 m) 0.08 But what the ground lacks in ρ , it makes up for in A! 25 ! Calculation of grounding resistance !  !  !  !  Because of its large cross sectional area the earth is actually a pretty good conductor. Devices are physically grounded by having a conductor in physical contact with the ground; having a fairly large area of contact is important. Most of the resistance associated with establishing an earth ground comes within a short distance of the grounding point. Typical substation grounding resistance is between 0.1 and 1 ohm; fence is also grounded, usually by connecting it to the substation ground grid. 26 ! Calculation of grounding R, cont’d !  Example: Calculate the resistance from a grounding rod out to a radial distance x from the rod, assuming the rod has a...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online