Ferranti effect

COMPLETE GUIDE FOR EASY UNDERSTANDING AND DEEP KNOWLEDGE OF FERRANTI EFFECT.

1. The ferranti effect P repared by: Tarun singh rajput B.E(ELECTRICAL) Govt. Engineering college,Bilaspur

2. SUB TOPICS WHAT IS FERRANTI EFFECT ?? WHY FERRANTI EFFECT OCCURS?? HOW WE WILL DO THIS IN LAB ?? ANALYSIS THROUGH PHASOR DIG HOW TO NULLIFY THIS EFFECT??.

3. What is ferranti effect In 1989, Sir S.Z.Ferranti came up with this theory. “ According to him in case of no load or light load Operation the voltage on receiving end(collecting end) is greater than the voltage on sending end (transmitting end).” “This effect is observed in short and long transmission Lines.”

4. WHY FERRANTI EFFECT OCCURS?? 1.A long transmission line can be considered to compose a considerably high amount of capacitance and inductance distributed across the entire length of the line. 2.Ferranti Effect occurs when current drawn by the distributed capacitance of the line itself is greater than the current associated with the load at the receiving end of the line(during light or no load).

5. 3.This capacitor charging current leads to a voltage drop across the line inductor of the transmission system which is in phase with the sending end voltages. 4. This voltage drop keeps on increasing additively as we move towards the load end of the line and subsequently, the receiving end voltage tends to get larger than applied voltage leading to the phenomena called Ferranti effect in power system .

6. 5.Thus both the capacitance and inductor effect of transmission line are equally responsible for this particular phenomena to occur, and hence Ferranti effect is negligible in case of a short transmission lines as the inductor of such a line is practically considered to be nearing zero. 6.In general for a 300 Km line operating at a frequency of 50 Hz, the no load receiving end voltage has been found to be 5% higher than the sending end voltage.

7. LET’S SUMMARISE: 1.V R >Vs. 2.FOR LONG/MEDIUM TRASMISSION LINES 3.DUE TO NO LOAD /LIGHT LOAD 4.CAUSE:CHARGING CURRENT

8. HOW WE WILL DO IT IN LAB ??

9. AFTER CONNECTION ….

10. TAKING READING..

11. OBSERVATION TABLE

12. PHASOR DIAGRAM OF FERRANTI EFFECT

13. END RESULT VOLTAGE RISE =0.5V R L 2 ω 2 C L

14. HOW TO REDUCE FERRANTI EFFECT 1.Shut Reactor compensation at the receiving end might help to reduce the effect of Ferranti Effect. 2. Shunt Reactor absorbs the excess reactive power generation during no load / light load condition and thus helps in stabilizing the voltage of Transmission Line.