Answer / greenhat25

When a fault occurs, a current flows in th secondary winding
of th current transformer.
If th current is greater than th setting of th relay, th
electromagnet is energised and attracts th armature.
The action of th armature closes and opens th normally open
and close contacts respectively, thereby closing or opening
th trip circuit.
The shunt trip coil or UV trip coil is energised or
de-energised and th circuit breaker will trip.

Answer / avd

In continuation to above answer, there are different
schemes to detect earth fault in the system
1. By using residual connections of three phases CTs
2. By using CBCT
3. By using a neutral CT at transformer neutral point.

what will happen if i will done heart shape hole in transformer core?

1 Answers   Bhel, ONGC,

---

What is the requirement of sulphuric acid in electrical feild?

1 Answers  

---

What are the transformer losses?

0 Answers  

---

Explain what is CBCT.

1 Answers  

---

How many turns are there in primary winding? (In Transformer)

0 Answers   Philips,

---

For an induction motor wat is the loading/unloading cycle duration or interms of L/UL ratio/ percentage?

0 Answers   GEPL,

---

What are the advantages of a three-phase system over a single-phase system?

0 Answers  

---

how to calculate a cable size while load is given in amp or kw and length is also define.?

1 Answers  

---

If a rotary UPS is in line through grid power; What would be the impact on Power Factor if the load through rotary ups is 25% , 50% , 75% & 100%. Will the power factor reduce with less load?

0 Answers  

---

APPLICATIONS OF SHUNT GENERATOR

1 Answers   Wipro,

---

Why and when NGR panel required. Is it necessary to design a NGR panel for a 6.6kV Alternator paralleling with Grid????

0 Answers  

---

how to get more than 1000 ohms between 2 earth pits ?

2 Answers   HCL,

---