Answer / narendra katakkar

First of all, a desired maintenance schedule is chalked out depending upon the diversity and intricacy of the installation. A typical maintenance schedule can be as follows.
1 Fix up a day (Maybe once a three months) and preferably when the installation is idle.
2 On that desired day the main power can be switched off, then disconnect all the neutral and body earth terminal connections.
3 Using Earth test instrument resistance of each earth station should be tabulated.
4 The earth stations to be properly watered or one can use drip irrigation system for continuous moisture retainment. If necessary add salt and charcoal or compound depending upon soil conditions. Excess of these materials to be avoided as this would lead to corrosion of earth electrode.
5 Check all the intermediate connections and remove rusted/corroded components.
6 Once again check the resistance values all the values should be below 2 ohms.
7 Connect back all the earth strips, on the power.
8 Fill up log book with noted resistance values.

Answer / venugopal

Earth resistance is maintained 2 ohms.and now a days using chemicals also for earthing

Answer / pratik mistry

get earthing soil wet properly...and maintain it...checkout the needles and road

Explain Power factor in simple words

1 Answers   ETO,

---

Why do you have to use Protecion relay with the function MTB ( Mechanical Trip Button ) for electrical system.

0 Answers   DT Technologies,

---

What is the meaning of coupling and decoupling in the context of power flow?

5 Answers  

---

In separetly excited m/c,we excite the field by a dc source,what not with ac source?

2 Answers  

---

Why dc Supply used in Control circuit.

12 Answers   HP,

---

how net resistance islow in star connection and viseversa in delta connection...? if anybody could explain in detail it wud be helpful.

0 Answers  

---

How will polarity test of Dy5 Transformer ?

0 Answers  

---

How we can recongnise the phase displacement of transformer connection between primary & scondary...plzzz explain it with example.........

0 Answers   BOC,

---

how many amps in 1 KVA? V=440v, PF=0.8 and FREQ=50Hz

22 Answers  

---

1. What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

3 Answers   BCPL,

---

Essential condition for parallel operation of two single phase transformer is that they should have same A polarity B kVA rating C voltage ratio D % impedance

1 Answers   wbsedcl,

---

In Battery Charger - What is the meaning of End Cell Voltage and Float Voltage.

9 Answers   FLSmidth, Focus, PSEB,

---