What should be the earthing resistance of an industrial
substation and also What should be the house hold earthing
resistance?

Answer Posted / sayyed

hor residential area the earthing resistance should be less
than 1 ohm.
for substation of capacity less than 33 kv the resistance
in between 1-3 ohm.

Is This Answer Correct ?    16 Yes 40 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

What are the main faults of DC generators?

2367


Mention the disadvantages of low power factor?

688


Explain the function and difference of Restricted earth fault, simple earth fault and sensitive earth fault with connection diagram.

2152


What is the height of DA, DAL, DB, DC & DDE tower?

1723


if an insulated power and control cables of a running gas diesel gensets laid direct in an open trench i.e, trench bed is not rcc of a power house in which rain water, spillage water alwas exists and all power control cables remains submerged even when gas gensets of 480 kw each runningin on load. These power &control cables runs from power house to switchgear room through these trenches in which water remains most of the time. pl explain its merit & de-merit

1408






why we use condenser in the thermal power plant, althrough the same vapour will be again heated

3956


Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1.  H1-H2 = H2-H3 H3-H1 2.  H2-H3 = H3-H1 H1-H2 3.  H3-H1 = H1-H2 H2-H3 For the LV side also: 4.  X1-X0 = X2-X0 X3-X0 5.  X2-X0 = X3-X0 X1-X0 6.  X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0  H2-H0  H3-H0    X0-X1  X0-X2  X0-X3 128.0  119.9  7.2      29.2   13.3   15.8 70.7   128.4  59.2     23.4   22.0   3.6 7.2    120.1  128.1    13.4   29.3   15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?

1370


how much UPS neutral erath leakage current.

3127


how to operate and maintenance of 1500 kva diesel generator set

1350


What are the functions of different probes used in cro?

678


State the frequency for rc phase shift oscillator?

587


hi can anyone pls tell me the eee interview core questions asked in l&t

1549


What is the Surge for 1.1 Phase Induction Motor(For Eg.1Hp) 2.3 Phase Induction Motor(For Eg.1Hp) 3.AirConditioner(For Eg 1Ton) 4.Refrigerator(For Eg 180Ltr or 160kW) 5.Induction Cooker 4. Ceiling Fan

1628


why power not passes in plastic and rubber material

1542


11 kV line deraction check by an Engineer.

1525