Interested to Buy Any Domain ? << Click Here >> for more details...
RATING OF LIGHTENING ARRESTER FOR 11 KV LINE IS 9 KV BUT WE
KNOW THAT LIGHTENING ARRESTER IS USED FOR OVER VOLTAGE
PROTECTION SO WHY NOT THE RATING OF LIGHTENING ARRESTER BE
MORE THAN 11KV ???????????????//
- 5 Answers
- 53105 Views
- Hakel, I also Faced
- E-Mail Answers
Answer Posted / h r jadhav
when we use ac line having system line voltage 11kv,in
this case phase voltage [phase to neutral which is earthed}
is 6.351 kv. lightening arrester is connected between phase
and neutral. lightening arester are nothing but the voltage
dependant resistors which act as insulator up to not only
the phase volatage ie 6.351 kv rms but ac peak voltage
reaches to 6.351 rms x root of 2 ie 1.414=8.98 kv. for
normal operation of system. thus the L A s are rated for
normal voltages 9 kv and discharge current generaly 10 kamp.
when ever voltage surges occures due to lightenig or either
by system abnormabilty,L A becomes for a instance as a
conductor provides path to surge voltages and prevents
failure of insulation leveles of equipment of system
| Is This Answer Correct ? | 32 Yes | 5 No |
Post New Answer View All Answers
what is servo motor & how does it work.
How to Prepare preventive maintenance shedule of machine tool.
Which do you think is the most significant cause of energy loss in a factory?
What is q factor?
can anybody send the rrb chennai &rrb bopal question papers of 2006&2007.My exam is on 12 oct 2008.Its urgent
How would you relate your key competencies to this position?
what will happen if i connect 12 volt battery with 24 volt battery charger.
what are the advantages and disadvantages of speed control of 3 phase induction motor by varying frequency explain with drawing
How do i right a ladder diagram that has 1 actuator that performs a full stroke followed by a half stroke
what is value of Jin transformer
What is the formulae of Megger value for a A.C.Motor
How to select circuit breakers rating eg. if i select a circuit breakers of capacity 40 amps DC with operating voltage 28 volts and if i what to use same circuit breakers for 300 Volts DC application what is the current rating of this circuit breakers.
I want to put this query to SENIOR & EXPERIENCED ELECTRICAL ENGINEERS. 1)I want to know about the control circuit diagrams for control panels. I found it difficult to understand. Is there ant booklet through which we can learn the circuit diagrams? 2)I want to learn about conduiting, laying cables, preparing cable schedules and various techniques which is the part of building infrastucture(construction field). I don't have any experience in this area. I have experience in control panels only. that's why i am not getting any opening in building infrastucture (construction field).Can I get the job in this field as Trainee Engineer? How to enter this field? I need job in PUNE
What is the purpose of stand by earth fault protection for transformer ?
Power Factor Correction Panel (Manual & Automatic)
