Answer / saqib ziya

dielectric strength

Answer / asit

insulation registrant= ro/2pel(log r2/r1)
inversely proportional to length 

when the motor was star position that is running ok but when the motor was delta it was tripped? why?

5 Answers   Nimbus, SEL Manufacturing,

---

what is earth resistance? how to measured? and give values at power station and mcc area?

1 Answers   Essar,

---

Dear sirs, pls check this 4-20ma to RS485 module datasheet,pls guve me some suggestions. http://www.szsunyuan.com/sy/pro_more.asp?Productid=539 Thanks. E-mail:yunianjiang99@gmail.com

1 Answers  

---

draw 3 phase rectifier diagram

1 Answers   Equate,

---

what are the effects when the frequency is decreased in any ac machine

1 Answers  

---

why neutral and body earthing of transformers kept separated? what is distance between two is required as per is?

6 Answers  

---

what are the units of cable insulation?

3 Answers  

---

what are the merits and demerits of synchronous motor over an induction motor...??

5 Answers   NTPC,

---

WTA used cb?

1 Answers   Tagros,

---

What are the advantage of free wheeling diode in a full wave rectifier?

1 Answers  

---

my question is Megger of cable insulation or swgr board meggerring some values in one day 50mohms,some other day checking different values(20Mohms). this tell that some person tell that that values ok. how to identify the megger value is correct. pls tell me the answer.

2 Answers  

---

why knee point voltage should be high in Ct for differential protection

1 Answers   NTPC,

---