Interested to Buy Any Domain ? << Click Here >> for more details...
Do you know how to measure the earth resistance? if so
explain it
- 42 Answers
- 179831 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 / felix shapilo
Ohmmeter measurements are normally made with just a two-
point measurement method.
However, when measuring very low values of ohms, in the
milli- or micro-ohm range, the two-point method is
not satisfactory because test lead resistance becomes a
significant factor.
A similar problem occurs when making ground mat resistance
tests, because long lead lengths of up to 1000
feet, are used. Here also, the lead resistance, due to long
lead length, will affect the measurement results.
The four-point resistance measurement method eliminates
lead resistance. Instruments based on the four-point
measurement work on the following principle:
· Two current leads, C1 and C2, comprise a two-wire
current source that circulates current through the
resistance
under test.
· Two potential leads, P1 and P2, provide a two-wire
voltage measurement circuit that measures the voltage
drop across the resistance under test.
· The instrument computes the value of resistance from the
measured values of current and voltage
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
What are the material used for resistor?
Give some example of fault limiting devices?
how many single tension hardware are required on a double circuit transmission tower?
Transformer how to maintaince a check b check c check d check
If i have two 3000 kW motors and the whole facility requires a 10 MVA transformer. What would be better installing two 5 MVA transformers(one for 1 motor ) or just a single 10 MVA transformer for both of them. Give reasons for your answer.
what reactive how to maintain
An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor reactance at stand still is A 2 ohm B 1.25 ohm C 3.15 ohm D 2.25 ohm
whats the differece between Exd and Exe
what is formula to cal cute earth pit numbers and size of earth strip used in earthing?
what is meant by brushed alternator & its working principle ?
how flow current in 220 kv line to line
What is the two pole structure?
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.
for 5KW resistive load can anyone please suggest me whether to go for UPS/Inverter or Generator depending upon cost calulations
A 3 phase transformer's (Y-Y) Y and B phase is (Y and B connection not broken) broken from neutral and R and Nutral connection is ok, what will be the relay tripping and why
