We use ungrounded DC system (220V/110V) for control and protection system in substations etc. Suppose we have long 2 core DC cables running from our DCDB in control room to the load (length of around 2 to 3 km). Do we need to protect these long DC cables from earth leakages or not? If yes how?

5 Answers   Siemens,

---

Why we use 2core cable for Dc motor.Can I use 3core?

5 Answers   JK Paper, Maharaja Whiteline,

---

Why capacitor is blow when I am starting motor ?

1 Answers  

---

why we r using alternator instead of d.c generator and induction generator

1 Answers  

---

what happens if i connect acapacitor to a generator load

5 Answers  

---

What is d role of reactive power in power system??How it produce & consume?

5 Answers   ABB,

---

What may be happen if neutral and earth is shorted in a substation

3 Answers   Bureau Veritas,

---

what is direct dischage of power transformer

1 Answers  

---

What is core balancing in Power Transformer. What is the affect of an unbalabce core.

1 Answers  

---

what is the potential of 11kv A.B.Switch

1 Answers   Power Grid,

---

what is the acceptable value of TAN DELTA and dissipation factor for 11kV, 1.75HP Motor?.

0 Answers  

---

why we step/down voltage in multipul of 11kv?

4 Answers   Siemens,

---