Answer / k.prakashchandra

As per discriminative time settings

Answer / karthi

Its depends on the selected relay charecterstics . normally
it will take 15 to 30 ms .

During he starting up of the motor, the upstream's MCCB (350A) always trips due to the UVT relay activated. Can Star-delta starter use for a 20kW Motor (For a powder mixer machine) cause voltage-dip in the supply line voltage? If so, what are the recommended solution to eliminate/reduce the transient voltage dip in the line voltage?

4 Answers  

---

Hi friends. is it possible that SCADA System through RTUs can connect Via PLCC Communication carriers ? thanks

1 Answers  

---

can we use the step down transformer to step up transformer

6 Answers  

---

what is practical efficiency of power transformer..?

1 Answers  

---

why in an electrical lab a bulb connected to supply goes off slowly when the main supply is switched off?

2 Answers  

---

what is different between neutral and earth?

4 Answers  

---

If auto trip is operated, can you close the breaker.

2 Answers   KSEB, L&T, Siemens,

---

What is RTCC in a transfomer and specify its function.

11 Answers   MCB, Vodafone,

---

For backup batteries connection,which method is best? series or parallel ?  

3 Answers   ABC,

---

WHAT IS SEMICONDUCTOR? EXPLAIN DETAIL. FOR EXAMPLE TAKE A PENCIL.THE LEAD IS MADE UP OF GRAPHITE IT IS A CONDUCTOR.THE OUTER COVER IS MADE UP OF WOOD IT IS INSULATOR.PENCIL IS A SEMICODUCTOR MATERIAL.

5 Answers  

---

Name two low frequency oscillators?

0 Answers  

---

How can we calculate strength of copper hich is supplying electric power to heater and in it hold the heater also and what r all types of forces which is acting on it...

0 Answers   ABB,

---