Answer / j.kesavan

Dar means dielectric absorption ratio test in HT
machines.HT megger reading 1minite/30second reading is Dar
test.

Answer / sam

DARThe is The ratio of a 60 s reading to a 30 s reading
this ratio of time-resistance readings can be used to
indicatethe condition of the insulation system.
DAR = Recsistance 60 sec / Resistance 30 sec
Goog Insulation DAR more than 1.25

In underground cables,we have a grading method called 'capacitance grading'.Why is it called 'capacitance grading' although we do not use any capacitor in it?

1 Answers  

---

have u any web site who can give all electrical sum's to solve counting easy like how to convert 1kw=?Kva.

1 Answers   Marriott,

---

slipring induction motor starting time Lrs operating why lrs starting time lrs outer body didn't get shock

0 Answers   Ramco,

---

What is mean by hormonics?

5 Answers  

---

If we connect the capacitor banks for DG set for maintainig the power factor, it will effect to alternator windings??????????

7 Answers  

---

what type of motor used to move a 1 ton gate? and relate ratings with load.

0 Answers   Khidmah,

---

What do we use in Motor core laminations..???CRGO or CRNGO..and why..????

1 Answers  

---

If there is major % of Voltage harmonics in the system, how can it be control or reduced?

0 Answers   JCN, Wipro,

---

sir i completed apprentice in TNEB.apprentice is eligible for 'c' licence

0 Answers   Bhel, TNEB Tamil Nadu Electricity Board,

---

why transformer do not rotate?

3 Answers  

---

What is the different between buchholz relay and pressure relief device?

2 Answers  

---

HOW CAN WE DECIDE THE SUPPLY VOLTAGE FOR MOTOR ACCORDING TO ITS RATING(IF ANYONE KNOWS GIVE IT WITH EXAMPLE AND ITS CALCULATIONS)

0 Answers  

---