Answer Posted / d m fulzele
ACTUALLY CT SECONDARY NEVER GROUNDED, CT WHEN CHARGED IT IS LOADED WITH BURDEN OF IT`S SECONDARY SHORT CIRCUITED.
CT IS OPPOSITE TO NORMAL TRANSFORMER. THE PRIMARY CURRENT IS DEPEND ON SECONDARY LOAD CURRENT IN NORMAL TRANSFORMER WHERE AS SECONDARY CURRENT IS DEPEND ON PRIMARY LINE CURRENT. IN CASE OF CT PRIMARY CURRENT IS VERY HIGH. THIS HIGH CURRENT PRODUCES FLUX IN CORE AND THIS HIGH FLUX INDUCES EMF IN SECONDARY WINDING. SINCE THE NUMBER OF TURNS IN SECONDARY ARE MORE, EMF INDUCES IS MORE AND IF SECONDARY IS OPEN THIS HIGH VOLTAGE MAY DAMAGE INSULATION AND CAUSE CT BURST. IF CT SECONDARY IS CONNECTED WITH LOAD OF SHORT CIRCUITED, THE LOAD CURRENT WILL FLOW AND THIS LOAD CURRENT WILL PRODUCES ITS OWN FLUX. THIS FLUX IS OPPOSITE TO MAIN FLUX AND RESULTANT FLUX WILL BE LOW AND HENCE THE EMF INDUCES WILL BE LOW. HENCE IN CT SECONDARY IS ALWAYS SHORT CIRCUITED OF CONNECTED WITH LOAD.
| Is This Answer Correct ? | 13 Yes | 11 No |
Post New Answer View All Answers
what is the reactive power what is the use of it in system
we have earthmat at 110KV substation.we would like to take earth resistance.b some says that by connecting earth megger terminals (C1,P1) at middile point of earthmat (at riser) will cause voltage gradient at other earthmat nods and dont get exat earth resistance.when connecting at end nods will get exat value . is it correct .please explain
Why Ac Systems Are Preferred Over Dc Systems?
If you have an earth with pilecap then your resistance is really low. why and how?
In EHV transmission line a neutral grounding reactor is often placed at neutral point of shunt reactors. What is the recommended protection for this neutral grounding reactor? Should I use a fast closing switch to bypass neutral grounding reactor when this protection operates?
Why GRR starts from 60% of motor speed why not less than 60%?
mention hazard experienced during installation
How to calulate Locked rotor amper(LRA) for compressor type motors?
What is mean by Sensitive Earth fault & what are the effects
how can i change the rotation of the AC single phase induction motor and show me by diagram
The capacitive reactance of a capacitor of 1/(2(PI)) F at 10^3 H is
How to size Air Circuit breaker (ACB)? What is the most important factors?
HOE WE CAN IMPROOVE BY USE OF CAPACITOR
How PSV sizing being done
Determine the BTU size of an aircon for 20 sq metre room
