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

Difference Between Differential Relay and Restricted Earth Fault Relay of Power Transformers

1 Answers   KSEB,

---

what r substations?what r there work?why voltages r incresed and then reduced during distribution of power

0 Answers  

---

Megger type of instrument is used to check??

8 Answers  

---

can anybody send the rrb chennai &rrb bopal question papers of 2006&2007.My exam is on 12 oct 2008.Its urgent

0 Answers  

---

sir what is the minimun earth resistance value of an industial bit and grid bit ? and Why?

1 Answers   Kirloskar,

---

in 3 phase induction motor resistance value is how much

1 Answers  

---

what is a tri vector meter? what are the tri vectors?

2 Answers  

---

What is the diffrence between PL Lamps and CFL Lamps

5 Answers  

---

how to measure the A.C flux .-instrument

8 Answers   NTPC,

---

Which motor has high Starting Torque and Staring current DC motor, Induction motor or Synchronous motor?

5 Answers   BSL, Elite, TTA,

---

What should be cable size for 75KVA 380/220 3ph transformer

3 Answers  

---

what is meant by cbct elr?

3 Answers  

---