Answer / kanth

1.we can store dc only with batteries
so it is easy to give the control ckt continuous
supply .we cant store ac by any device
2. we can use ac also ,but there batrtery is must through
inverter only we can have ac from battery
bur for controlling purpose most of us preferred dc

Answer / prabhu gnanasekaran

There is specific reasons for using for using DC supply as
control circuit.
All controll units like( Realys, ok
TRIP CIRCUIT,ALARM,indication lamps and other units are
designed for DC supply. The are meters and control cicuits
for AC source also

1.In two wattmeter method if one wattmeter shows Negative reading then wat is reason? 2.Wat is the reason for low voltage in houses? 3.Wat is meant by current and voltage? wat is difference between the two?

10 Answers   Engineering,

---

What is the comparison of PILC and XLPE cable

0 Answers  

---

what is dc transformer? how it work?

15 Answers  

---

For overhead protection we use which transformer?

0 Answers  

---

What is meant by reverse polarity and how it can be fixed?

0 Answers  

---

---

What is load boxes ?

0 Answers   AMIE, PEPL,

---

why the neutral point of star connnection oscillates?

3 Answers   Avalon,

---

Difference between ups and invertor

3 Answers  

---

What are series and parallel isolators?

3 Answers  

---

A TRANSFORMER 440/400V,DELTA/STAR CONNECTED.THE NEUTRAL CONNECTED WITH GROUND CABLE THAT IS DIRECTLY CONNECTED TO THE PANEL,FROM PANEL IT IS CONNECTED EARTH PIT.IS IT RIGHT? IF IT IS RIGHT LEAKAGE CURRENT AFFECTED.SECONDATY IS PROTECTED WITH EARTH LEAKAGE RELAY.

0 Answers   Jindal,

---

what are the protection equipments used betbeen HT line and transformer in a power plant

4 Answers  

---

How to calculate mf when meter equipment and meter are connected

0 Answers  

---