Lecture15

Lecture15 - Page 1 Fundamentals of Power Systems Lecture 15...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

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

Unformatted text preview: Page 1 Fundamentals of Power Systems Lecture 15 1 Ampacity Fundamentals of Power Systems Lecture 15 2 Geometric Mean Radius (GMR) ' 1 1 ln ln ln 2 4 2 4 1 r r D D L r r P P P P S S ' 1 ln 2 D L GMR P S Inductance of conductor up to a distance of 1 unit (e.g. 1 foot) ' 1 ln 2 GMR L GMR P S Per definition the GMR of a specific conductor or conductor arrangement is the radius of an infinitely thin tube with the same internal inductance as the conductor itself out to a 1-foot radius Inductance of conductor in H per meter length with return path at distance D Page 2 Fundamentals of Power Systems Lecture 15 3 Alternative Formula used in Practice Substituting ln (base e) by log (base 10) Inserting P = 4 S 10-7 Vs/Am Expanding 1 mile = 1609.344 m ' 2 l n 2 6 l n 2 6 2 D f D X f GMR GMR P P S S S S 7 ' 4 10 1609.344 2 60 log 60 2 log( ) f D X e G M R S S S in : /mile (per conductor) ' 0.2794 log 60 f D X GMR Fundamentals of Power Systems Lecture 15 4 Example: Line Impedance...
View Full Document

Page1 / 6

Lecture15 - Page 1 Fundamentals of Power Systems Lecture 15...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online