Answer / kj

See extract from service manual for HV alternator.

A 5000V motorised megger or similar instrument should be
used. Separate the three neutral leads,
ground V and W leads and megger U to ground. Repeat for V
phase with U and W grounded and W
phase with U and V grounded. Minimum acceptable limits
after 1 minute for each phase are:
New machine 300 M

In-service machine 150 M

The insulation resistance should not be less than specified
and the polarisation index should be in the
order of 2 or greater at 20 ºC.
(PI = IR10min / IR1min)

why we dont store the ac power in battery?

1 Answers   TCS,

---

What is a signal flow graph?

0 Answers  

---

Dear all, i completed M.E(Power Electronics & Drives) 2011 passed out having 78% so i need job in core side but i don't know how can i receive the calls from electrical companies and i uploaded my CV in naukri, times jobs etc.. In that iam not recieved any mails from good companies so give me best procedure plzzzzzzzzzzzzzzzzzzzzzzzz..... Thanks, K.Linga Reddy Email-id:-lingareddykmthm@gmail.com Ph no:-08015402078

0 Answers  

---

Which motor will you choose which can operate in both lagging as well as leading power factors?

0 Answers   HPCL,

---

The ripple frequency in output of fullwave bridge rectifier is a. Half the input b. Twice the input c. Same as input

0 Answers  

---

what is the magnitude of earthing and neutral voltage

2 Answers  

---

Why not using Air circuit breaker at High tension side?

1 Answers   Wipro,

---

what are the main components of fan?

2 Answers  

---

I want to calculate how much capacitor we connect to maintain the unity power factor? Is there any formula? Pls give me the answer

0 Answers  

---

why DC current not used in Transformer action?

17 Answers   Engineers India Limited,

---

plz explain the snubber circuit unit

1 Answers  

---

how can get electrical c licence.now i am working in spining mill , transformer capacity 2750KVA. SANCTION DEMAND 2250KVA. PLEASE ADVISE ME . MY CONTACT NO 09944226823

0 Answers  

---