Answer / m.gopinath

Earth fault protection is non-unit protection for earth
faults where as restricted earth fault protection is a unit
protection (ie differential protection of Y connected
alternator/transformer) for earth faults. So we can say the
Restricted earth fault protection is differential
protection of a y connected winding for earth faults only
but not for phase-to-phase faults.

IN OLTC we observed "OUT OF STEP" Alarm, we have two different transformer, when both are in parallel this type of alarm observed. what's the meaning of this alarm and why it occurs???

3 Answers  

---

MCB is used for high rating &MCB is used for lower rating.What is technical difference between ACB & MCB?

7 Answers  

---

where rlc series ckt used?

0 Answers   ABB,

---

why synchronous motor is not self starting

5 Answers   Cenored,

---

Why DC weldings sets preffered over AC considering human safety aspects ?

2 Answers  

---

at which voltage level arcing ground is occurs ??????????

0 Answers   TATA,

---

What do you understand by external characteristics of a d.c. Generator?

0 Answers  

---

What is difference between PVC cable & XLPE cable?

14 Answers   Intertek,

---

without name plate detail of blower how we can find out the HP & Rpm ? the input voltage is 230v single phase

1 Answers  

---

how much current carry a 3-1/2 core of 100mm size cable.explain it with solution

2 Answers   ACS,

---

What do you mean by distributed winding in alternators? how exactly is 3 phase power generated?

2 Answers  

---

We in my plant one of the transformer showing neutral to earth voltage is 22V how to solve it

3 Answers  

---