Why we not use the impedance relay in protection of short transmission line ?
- 4 Answers
- 7099 Views
- I also Faced
- E-Mail Answers
Answer Posted / nagesh.patwari
1. During Short circuit current Step and Touch potential increases.Step potential : It is the potential developed between the two feet on the ground of a man or animal when short circuit occurs. This results in flow of current in the body leads to electrical shockTouch potential: It is the potential that is developed between the ground and the body of the equipment when a person touches the body during fault condition. When operating personnel touch an electrical equipment during short circuit condition, fault current flows through the human body. This is defined as touch potential.Gravel/Stones in the substation is provided to reduce the step potential and touch potential when operators work on switch yard.2. Power Transformers installed in the substations will have oil as cooling and insulating medium. Oil leakage takes place during operation or when changing the oil in the transformer. This oil spillage which can catch fire is dangerous to the switchyard operation. So Stones/Gravel is provided to protect from fire when oil spillage takes place.3. Stones eliminate the growth of small weeds and plants inside the switch yard4. Improves yard working condition5. Provides protection from wild life and snakes.
| Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
1.WHAT IS A SMART CAPABLE DB ( DISTRIBUTION BOX) ? 2. HOW TO DECIDE THE TYPE OF DB TO BE USED ( RECESSED/ PLUG TYPE/ SMART ETC ETC? 3. WHAT IS MILLENEUM BUS BAR USED IN DB? 4.DIFFERENTIATE MCCB AND MCB.
Define average demand?
Please define ampere?
what precautions to be taken while desigining a LT,HT panel. Eg-LT panel PCC panel with ACB installed. HT panel VCB panel with VCB installed. & what is main diffrence betwn IP54 & IP55 construction of panel.
hai now i am working as a electrical design engineer in construction field can i get a job in oil and gass field or power plant project as a electrical design engineer?
WHAT IS THE MEANING OF BALANCED / UNBALANCED IN STABILIZER TYPES.
How many VSC based HVDC are there in India and the world
what parameters should we check to reduce the power bill
How harmonic block test are conducted on relays ( Siemens,Areva ect )power transformer using omicron kit?
How is efficiency of DG set calculated? At many places I found the efficiency to be mentioned in percentage. But at some other places I found kWH/ litres. I want to know how dimensionless percentage value is arrived at?
What does the term power factor shows?
sir my exam is on 19/6/2013 under electrical branch pls send me sample aptitude questions as well as sample technical questions for jindal steel and power company
1.main parts of generator? what is used A-check,B-check,C- check? 2.what is FM200 system in data centers? 3.difference between pac,ahu?
What is deference between MCB & MCCB & ISOLATOR
If increased the frequency up to 1000 then what changes shows in voltage?
