when power transformer is flashed which gas is produce in side?

5 Answers  

---

what is humming AC solenoid

2 Answers   Seagate,

---

7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?

0 Answers  

---

I have 1 KW, 3ph. 440v, 50 hz, cos(phi) .75, efficiency 75%(star delta connection)Motor. How to calculate line current & Phase current (1) Star connection (2) delta Connection

2 Answers  

---

how step down and step up voltage is occured in transformer

3 Answers  

---

If increased the frequency up to 1000 then what changes shows in voltage?

0 Answers  

---

What is fault level? How can be calculate the fault level?

1 Answers  

---

Why earthing done?

1 Answers   CBRE,

---

State norton’s theorem?

0 Answers  

---

What is the different between Earthing & grounding?

1 Answers  

---

which types of relay used in acb and vcb?

0 Answers   IBM,

---

what is the temperature rise test? explain in brief.with formula.

1 Answers  

---