Do you know how to measure the earth resistance? if so
explain it
- 42 Answers
- 152708 Views
- ABB, BEL, BridgeStone, College School Exams Tests, Dalkia, Dalmia Group, DEC, Electrical, Genpact, HEC, IOCL, JLL, L&T, MSEB, Saraca, Sical, Telecommunications, University Exams, I also Faced
- E-Mail Answers
Answer Posted / s. ghosh
earth resistivity is measured by earh megger . there so
many methods of earth resistivity measurements like1)
wenner 4 pin method, 2) schlumberger method, 3) driven rod
or 3pin method. all those test results varies on different
parameters of the site. to minimise tose effects the tests
has to be performed in an arrey called"line traverse
servay". the detail of those above methos i.e. the distace
of rod depth of rod and their variation is to be discussed
in detail. however the result given by the "earth megger"
i.e. the resistance of earth is to be converted into earth
resistivity by the following formula.
Wenner method:-
r(resistivity) = 2(PI)A R : A =Probe spacing, R
resistance reading in the E/megger
Schlumberger:-
r=(PI) L.L.R/2.l L=centre limb to outer probe,
l=centre limb to inner probe,
Driven rod:-
r=2(PI)lR/Ln(8l/d) l=rod length in earth, d=dia of rod.
contact me at sgmanofpower@yahoo.com if you have got
further details or questions.
| Is This Answer Correct ? | 12 Yes | 10 No |
Post New Answer View All Answers
how to identify vector group of three phase transformer by voltage method?
IN SINGLE PH TRANSFORMER IF LEKAGE IMPEDANCE DROP IS NEGLECTED ,THE FLUX IN THE MAGNETIC CORE and the lekage flux linking a winding are a)proportional to the applied v to the winding i respectively.
clarify types of motor operated valves and advantages
If we need 4c× 50mm sq cable but it's not available so we can pull 4c×25mm sq two cables?
How harmonic block test are conducted on relays ( Siemens,Areva ect )power transformer using omicron kit?
What is difference between mcb and mccb.
What is the rate of WCT on the Electrical Contracts comprising of DG Sets and Civil Works in Delhi ?
what do you mean by type zero control sytem ?Give an practical example of type zero contol sytem?
how to check ac servo motor
what is the diference between the 4pole & 6pole DC Motors & what is advantage 6pole over the 4pole ?
quantizer means?
I WANT HOW CALCULATE TO CABLE FOR WELDING PLANT ?
what is the chemical name and formula of refrigarent R-134a.
what is the ms flat constant for calculating earth mat design calculation?
RESPECCTED SIR/MADAM- I AM PRERING FOR SECTION ENGINEER (ELECTRICAL) RRB CHANDIGARH PLEASE SEND ME SOME PREVIOUS YEAR QUESTION PAPER OR MODEL PAPER.MY EXAM IS ON (30- NOVEMBER 2008).I AM VERY THANKFUL TO YOU. FROM- HARENDRA SINGH YADAV
