Answer / raj

IT IS NEUTRAL DISPLACEMENT RELAY AND IT IS USED FOR VARIOUS
PROTECTION BUT THE PRINCIPLE IS THAT IN CASE OF NO FAULT NO
VOLTAGE IN RELAY ( IT USED OPEN DELTA VOLTAGE FOR RELAY
INPUT ) AND IF FAULT OCCUR IN ANY PHASE THEN UNBALANCED
VOLTAGE WILL GET ACROSS OPEN DELTA FOR RELAY TO OPERATE.

Answer / k.prakashchandra

It could be non-directional relay which is cheaper than
directional relay and used wherever current is not expected
in both directions.

What is mimimum di -electric strength value for 33 KV transformer OLTC oil

0 Answers   Franke Faber,

---

What is the difference between acs 550 & acs 850

0 Answers   Madhucon,

---

How to calculate & connection of 900KVA generator 2 sets & load(1500A)? How to choose cable size and ACB size for this load & generator? please explain me detail. Regards, Mr.Han

3 Answers   Powermec, TATA,

---

can you send me the placement papers of electrical engg. from companis like NTPC,DRDO,IOCL,HPCL,BPCL etc.?If,plz send as soon as possible.Thanks.

0 Answers   NTPC,

---

how to calculate load if i have three phase & single phase connection from power transformer( in term of kw & kva).can i take single phase load/3 for total kw calculation

1 Answers  

---

---

what is the control circuit for operating the clean room air shower

0 Answers   L&T,

---

If 110 volts ac is mixed up ith 12 volts dc what will be the resultant voltage and what is the wave form?

1 Answers  

---

WHAT IS A BASIC DIFFERENCE BETWEEN THYRISTOR,TRIAC AND A DIAC.AND WHAT R THERE APPLICATIONS?

5 Answers   Petronas, TCS,

---

conditions for parallel operation of dc generators

4 Answers  

---

Difference between earthing & grounding.?

3 Answers   ABB,

---

what is th basic difference between a d latch time line and a d flip flop time line???

0 Answers  

---

How many types of DC current

2 Answers  

---