Answer / rajeshsan

salient pole machines driven by water turbines at a speed in the range 50 ±1000 rev/min. Generally used for low speed applications. The speed depends on the type of turbine,which in turn depends on the head and the flow rate of the water available. At low speeds, the permissible rotor diameter will be several times its active length. Generally,the largest allowable diameter of rotor is used to maximise the machine's inertia which is an important part of overing the water turbine. Outputs up to 800MW have been achieved. A small high-speed unit will have a horizontal shaft, but for reasons of mechanical construction and stability larger machines have vertical shafts.

why do we lay up the core of a cable?

0 Answers  

---

why the pf of semiconductor device is improved the electrical devices

0 Answers  

---

what is ratio test?

1 Answers  

---

What is the loss of power of transformer 220kv/33kv,63/80mva of % imp12.05 at 80%load

0 Answers  

---

Distribution transformer we provided 2 separate earthing pit for Body and 2 separate earthing pit for neutral,we can not connect separate body earthing pit to other earthing pit but we do metal glanding in secondary side cable termination in both side, transformer and PCC panel (LT Panel), is this safe for transformer and other equipment?

0 Answers  

---

what are the disadvantages of low power factor

0 Answers   HMK,

---

Why in Hv transmission line as we see there are generally 6 or more than 4 conductor wires are used instead of 4 i.e. 3 for phase and 1 for neutral wire?????

2 Answers  

---

if we know Fault level say 25 KA , How to decide busbar size for Distribution network of 1000 Amp Breaker ? Sample Calculation or Farmula Available or not ?

4 Answers   TCS,

---

we can use airconditioner for cooling the winding of transformer ,if not why?

3 Answers  

---

What is the operating range(tolerance) of voltage and frequency of grid supply in india?

10 Answers   BARC,

---

WHY BREAKER ARE USED IN SUBSTATIONS?

0 Answers   Fedco,

---

what is the acb tripping & closing voltage.

2 Answers  

---