Wtat is mean by GHOAST VOLTAGE?

3 Answers  

---

why induction motor speed is decress with increase in load? how synchronous motor speed is constant?

1 Answers  

---

Why air circuit breaker off due to power failure?

0 Answers  

---

What is the purpose of lighting Transformer used in Industries for Lighting illumination? Its necessary or not?

2 Answers  

---

which transfofrmer oil break down voltage strength get will be more if oil sample taken from bottom of tank or oil sample taken from top of the transfomer tank.

2 Answers   NPCIL,

---

---

what is the size of ht cable of 33kv ht line and transformers ratings are 1 Mva and 5mva.please send formula also.

0 Answers  

---

What is capacitance?

0 Answers  

---

Can neutral line also be use as a earthting for distribution transformer, or we need separate earthing pit forh the transformer?

1 Answers  

---

1. which type of transformer connection is preferred in case of power supply transformers? (A) Star/Star (B) Delta/Delta (C) Star/Delta (D) Zig Zag/Star 2. In a power transformer usuall which winding is closer to the core? (A) Primary winding (B) Secondary winding (C) Low Voltage winding (D) High Voltage winding 3. The power factor of a purely inductive load is (A) Zero (B) Lagging (C) Leading (D) Unity.

9 Answers   CECRI_Central_Electrical_Research_Institute,

---

We operate a 10 Mw facility and we have been experiencing several trips due to fluctuations on the MVAR? We have checked all issues related to the AVR and we have found all OK? Can anyone help us? The grid voltage, internal voltage, all regular parameters look ok. MVAR fluctuate and there it goes the unit? What could be happening? Thanks!

5 Answers  

---

In transformer how measure the winding temperature ?

5 Answers  

---

We have a 12MW power plant & we inject 5-6MW power to Orissa GRID. For this we have a 33KV/11KV switch yard having 12.5MVA power transformer. Some times we draw power during emergency. It is observed that during Export or Import for load less than 500Kw the power factor is decreasing to 0.3 . This is happening only during export or import. During island condition TG power factor OK.Our capacitor bank is provided with our Power plant auxilliary load. Please suggest how I can we improve our power factor during low load (GRID).

3 Answers  

---