what is the synchronous timer ? and it applications.

0 Answers   CPCL,

---

if the transformer at full load have a iron loss =900w and copper loss = 1600w . what percent of the load will the transformer has a maximum efficiency?

3 Answers  

---

Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N relays built into a single relay as i have noticed that the R,Y,B CT wiring end up into the 67 relay while the common of the R,Y,B CT wiring end up into the 67N relay. Then it was better if a single relay was manufactured just like the distance relay (21). Another question i would like to ask is - how do we know where the 67 and 67 N relay has to be placed.why is it not placed at the transformer bay? In the substaion that i am working -i have noticed that it is placed between a breaker and a common double bus bar and this line bay is connected to another substation at a remote place which is furthur connected to a load. B U S______CT for 67 & 67N ______Breaker _____ remot s/s. B A R

1 Answers  

---

How to control motor gearbox speed and friquency? If length of cable and dia given, how to measure the voltage drop?

0 Answers  

---

Why we use RYB phase sequence?

3 Answers  

---

---

Can we Co-ordinate relay in Load Break switch?

0 Answers   Bhel,

---

How can we Run three phase motor when only single or two phase supply is available ??

3 Answers  

---

Merz-Price circulating current principles is more suitable for

1 Answers   Student,

---

DG Earth Value?

0 Answers   Reckitt Benckiser, Vodafone,

---

minimum ohm for lighting minimum ohm for Earthing

3 Answers  

---

Define heating time constant of electric motor.

3 Answers  

---

What is the differentional relay...what is the work of this in power Tx. how it is works..

0 Answers   ABB,

---