Answer / nizam salih

A pole drop test can be done when the generator is in
standstill condition. Provide a ac voltage of 230V to the
rotor terminals of the salient pole machine and measure the
voltage drop in each pole. At least 5A should flow through
the rotor poles. A small current will not provide good
results. Once the voltage drops are recorded calculate the
drop index as follows.
Index = (max. value - min. value)/avearge value *100 %
An index value of less than 5% reprsents the poles are
good.
This is the usual annual test that we carry out in our
hydro generators.
Nizam Salih, Electrical Engineer, Sri Lanka.

what is %impedanece

3 Answers   KSEB, Steel Plant,

---

why and where we use early make & late break contacts in protection?

0 Answers  

---

What are linear and non-linear systems?

0 Answers  

---

what is the difference between arc and spark

2 Answers  

---

in case of transformer the power factor is depend on input or the output

1 Answers  

---

what is the difference between ac motor and dc generator

0 Answers   ETA,

---

Transformer TTR test procedure

2 Answers   Descon,

---

pls send me some question and answer for rrb railway interviw related 2010

2 Answers   CEAT, RRB,

---

What is the difference between AC Drive and VFD?

10 Answers   ITC Infotech,

---

How much ampere can withstand for 2sq mm c able?

2 Answers  

---

Draw the vector diagram and condition for the following: 1) Dyn1 2) Ynd0 3) YnYn0

0 Answers  

---

How can claculate to attain the desired PF in the line ( HOW Much KVAR is required ) Pls Give the formula?

2 Answers  

---