Answer / bhatt

Earth pit resistance is measured by Earth tester, Earth
tester have four terminals P1,P2,C1,C2 i.e. Two potential &
Two Current terminals. while earth pit testing, P2 & C2 are
shorted and C1 connected to current spike(Conductive rod)
which should be drived into soil at around 30 meter
distance from earth pit and P1 is connected to potential
spike(Conductive rod) drived at around 15 mtr away from
earth pit in the direction of current spikes.By rotating
the handle of meter(in old meters) or by pressing test
button (in new type meter) one can get earth resistance.Now
Potential spikes are drived at different locations toward
earth pit and current spike side and a curve between
distance and resistance is plotted. Earth resistance will
be platue of the graph.In this meter current is passed
between earth pit and current spike and potential is
measured between potential spike and earth pit. Ratio
between Voltage measured and current passed thrugh the
earth is the resitance of earth pit.

Answer / satya narayan padhy

Earth pit resistance is measured by Earth tester, Earth
tester have four terminals P1,P2,C1,C2 i.e. Two potential &
Two Current terminals. while earth pit testing, P2 & C2 are
shorted and C1 connected to current spike(Conductive rod)
which should be drived into soil at around 30 meter
distance from earth pit and P1 is connected to potential
spike(Conductive rod) drived at around 15 mtr away from
earth pit in the opposite direction of current spikes.By
rotating
the handle of meter(in old meters) or by pressing test
button (in new type meter) one can get earth resistance.Now
Potential spikes are drived at different locations toward
earth pit and current spike side and a curve between
distance and resistance is plotted. Earth resistance will
be platue of the graph.In this meter current is passed
between earth pit and current spike and potential is
measured between potential spike and earth pit. Ratio
between Voltage measured and current passed thrugh the
earth is the resitance of earth pit.

Answer / salman hazari

Earth pit testing is measured by megger or earth pit tester. There are 4 terminals in megger. P1, P2, C1, C2, it means there are two potential terminals and two current terminals. while measuring earth pit resistance we have the requirement of 3 wires. one wire will be connected between one earth electrode which has drived in ground and P1 point of tester from a distance of 30 meters from earth pit. 2nd wire will be connected between one earth electrode which has drived in ground and C1 point of tester from a distance of 15 meters from earth pit. Both electrodes in opposite direction. Shorted P2 & C2 terminal by a small piece of wire. connect one wire to the Earth pit from shorted wire. Move the handle of megger. you will get the resistance value. As theoretically value should be 0 ohm. But practically it should be less then 1 ohm.

Thanks
salman Hazari
chief Engineer
Keys hotel
pimpri, pune

Answer / sabir khan

It's measure by earth tester

Answer / karthik.j

The earth pit resistance is measured by Megger meter. This
measurement will be done on every two months once in the site.

Answer / upen

It's measure by earth tester it must less then 1mega ohm 0.02 is better

Answer / susanta paul

Earth pit resistance is measured by Meggar.This measurement will be done on every year once in the site.

the input mechanical power of a single alternator is increased,its RPM increased but in case of an alternator synchronised with grid its RPM does not increased with increase of input mechanical power. why?

3 Answers   Bhel,

why do we use LPF wattmeter not UPF in the experiment of no load and blocked rotor test of 3phase slipring induction motor?

3 Answers   Matrix,

For having nonavailablity of 10 Amps fuse, a lineman replace the same with 5Amps two strand, Do he correct ?

4 Answers  

Lt motor sfu flashing reasons?

0 Answers   NDFL,

What will be the output of t/f supplied with DC sourse?

2 Answers  

Why field rheostat is kept in minimum position while armature rheostat at maximum position?

0 Answers  

How can claculate to attain the desired PF in the line ( HOW Much KVAR is required ) Pls Give the formula? Equate Petrochemical 0 1 how to calculate sizing of NGTR (Transformer rating,Loading resistor value and Current rating of resistor) and what is the X/R ratio. Details : 11kV,Capacitance 1.73532 micro farads,40kA for 1sec. 0 1 What will happened. if we feed 3phase supplay to the stater with out insert the rotor. How much current will flow through the stater winnding? Equate Petrochemical 0 1 What is required of exietation to the alternater. 0 1 why star point of HT motor not earthed? Equate Petrochemical 0 1 Why we are getting low voltage in star connection? Equate Petrochemical 0 2 What's ND relay & it's functions? Equate Petrochemical 0 2 How instantanious short circuit current is calculated? its formula? Equate Petrochemical 0 2 What is servo Motor? What's the advantages of this motor over Induction motor? Equate Petrochemical 0 2 What is core CT & it's function? Equate Petrochemical 0 3 what is meant by star/delta voltages as 440/220 in a 3 phase induction motor, and why it should be connected on STAR IN 3 PHASE SUPPLY L & T 0 4 What is required of exietation to the alternater. KNB 1 23 what is the design voltage for 6.6KV 2000 KVAR HT capacitor? Consultancy 0 3 Pls explain about vfd control?Where it is used, Give some example? siemens 1 22 Please explain me abt PQ diagaram in the power sector. 0 9

0 Answers  

What are differences between Voltage, EMF & Potential difference ?

0 Answers  

how to carried out tan delta test in 11 KV alternator ?

0 Answers  

Plz tell me how we can find that particular company has vacancy or not

0 Answers   L&T,

please tell me the all the spcications of the 100MW 11KV HYDEL POWER PLANT SPECICATIONS

2 Answers   Bhel,

depending on what we can choose the rate of mccb considering that we know the total load

2 Answers