Answer / k.prakashchandra

-24 V dc means potential difference from + terminal or O
potential.If we earth the midpoint 0f 48V DC source ,then
one terminal is +24V and the other -24V with reference to 0
potential ground which gets connected to all metal bodies

Sir We have a REF relay connected to 10MVA(Y-Y) Transformer.on External earth fault REF relay trips along with earth fault relay.The REF relay has no complant as we tested relay.Why is it happening?

3 Answers   KSEB,

---

in alternator what is use of AVR ? how AVR is operating either AC or DC?

1 Answers  

---

Why reactors use before incoming of ac vvfd drive?

0 Answers  

---

what are the duty ratings in DG sets?

1 Answers   L&T,

---

We need to current density & short circuit calculation at 65kA for aluminium & copper busbar.

0 Answers  

---

---

WHAT IS THE DG OIL SPECIFICATIONS AND WHAT IS THE DIFFERENCE BETWEEN THE DG OIL AND TRANSFORMER OIL

4 Answers  

---

how to calculate the MF in meter reading

2 Answers  

---

for testing busbar (33kv) hi-pot .whether we can apply DC r not.and what is the test volt for that .explain

4 Answers   WGPSN,

---

Short circuit current of 2500 KVA 11/0.415 KV transformer both Secondary and primary side. best regards. Ali

1 Answers  

---

If we feed 230V ac supply to a full wave rectifare, what & how much will be the out put voltage?

3 Answers  

---

how to calculate the distance relay faulty zone?pls explain?

0 Answers  

---

why dose not transformer not rotate ?

3 Answers  

---