Answer / chreamz

A switchgear is an automated electric power switching
device or cubicle. It comprises of Current Transformer,
Voltage Transformer, Relays and Circuit Breaker. Together,
these instruments work hand-in-hand to initiate Closing,
Tripping of power hence protecting the connected load in
the system.

Should a fault occur within the system, a CT pick up the
exact type of fault, sending the associated signal to the
relay. The relay, dubbed the brain of the switchgear, send
an isolating signal to the CB to cut the power, hence
preventing catastropy to the connected load.

how to improve IR value in HT motors?

3 Answers   ABB, AMW, Macleods,

---

What is plugging as applied to an induction motor?

3 Answers  

---

what is the effect of leading power factor on Power transformers in existing in major power utility

2 Answers  

---

why connecting surge unit in contactor coil

0 Answers  

---

Differentiate between power relay and reverse power relay?

2 Answers   ABB, TVS,

---

how to calculate the Neutral transformer impedance?

0 Answers   Schneider,

---

how we can select a transformer based on a particular load. suppose we have 4 motors of rating 40 h.p , 50 h.p, 80 h.p & 100 h.p. then what rating of transformer we can select. urgent. pls reply

6 Answers  

---

what is the advantage and disadvantage of billing in kwh and kvah by electricity board .

6 Answers   Nespak, NTPC,

---

Electronic circuit

0 Answers  

---

what is derating?, why it is neccesary, it is same for all means for drives, motors,and cables.

1 Answers  

---

for a 400kv t/m line with 10 ampere current will corona occur?

0 Answers   NPCIL,

---

why transformer are rated in KVA not in watt?

7 Answers   DMRC, L&T, TCS,

---