Wednesday, February 24, 2010

What is the difference between AAC and ACSR?

AAC is stand for All Aloye Conductor.

All stands of this conductor is Aloye (Fly and Wasp only)

ACSR is stand for Aluminium Conductor Steel Reinforce.

six stands are aluminium and other one stand is steel reinforced.(Racoon,weasal and Lynx)

What are the conductors used in electricity?

conductors are as follows;

Weasal - 7/0.102"(7/2.59mm) 95 A (Maximum current) 33mm2(cross section area).(AAC)

Fly - 7/0.134"(7/3.40mm) 155 A (Maximum current) 63mm2(cross section area).(AAC)

Racoon - 7/0.161"(7/4.09mm) 200 A(Maximum current) 78mm2(cross section area).(ACSR)

wasp - 7/0.173"(7/4.39mm) 200 A (Maximum current) 100mm2(cross section area).(AAC)

Lynx 37/1.10"(37/2.79mm) 325 A(Maximum current) 175mm2(cross section area).(ACSR)

GNT - 7/2.21mm Maximum current 85A. (AAC).

Lady Bird - 7/2.79mm,Maximum current 120A,(AAC).

Ant - 7/3.10mm,Maximum current 137A,(AAC).

Earwing - 7/3.78mm,Maximum current 180A,(AAC).

Mink - 7/3.66mm,Maximum current 155A,(ACSR).

Dog - 7//1.57mm or 6/4.72mm ,Maximum current 205A,(ACSR).

Tiger - 37/2.36mm,Maximum current 265A,(ACSR).

Goat - 37/3.71mm,Maximum current 495A,(ACSR).

Zeebra - 61/3.18mm,Maximum current 575A,(ACSR).


Tuesday, February 23, 2010

Power losses in electricity network

as followes;

Generation = 7 %
Transmisson = 5 %
Distribution = 13 %

What are the high voltages used in sri lanka ?

33Kv
66Kv
132Kv
220Kv

why is the high Voltage Transmit ?

When the current is transmitting through the cables,power may be loss due to heat.
that is you can understand by using below equation;

power(P)= I*I*R


I= current through cable(Amp).
R= Cable Resistance(ohm).
P= Power (Watt)
When the current is increased, Power may be increased according to the above equation.therefore power loss is increase.

in order to reduced the power loss, you have to reduced the current through the cable.
According to the Ohms law, to reduced the current you must increase the voltage . as below,
V=I*R

therefor High voltage used to transmit the current.

Wednesday, February 17, 2010

SOURCES OF ENERGY

1.The Sun.
2.The wind.
3.water
4.fule.
5.Nuclear Energy.

What are the importance of Electrical energy?

Electrical energy is superior to all other forms of energy due to the following reasons;

1. Convenient Forms.

2. Easy Control.

3. Greater Flexibility.

4. Cheapness.

5. cleanliness.

6. High Transmission Efficiency.