Interested to Buy Any Domain ? << Click Here >> for more details...
why should we place 9KV lightning arrestors in 11KV
substation ?
- 9 Answers
- 44929 Views
- DOL, ISRO, Matrix, I also Faced
- E-Mail Answers
Answer Posted / d. bhowmick
All power system devices are designed with certain
tolarence limits.This is because it is always desirable
that the equipments/devices can withstand transient
voltage/current rise without any damage up to a certain
preset limit.
For an 11 KV line, the effective phase to ground voltage is
6.35 KV. That is, an LA associated with this line(between
the phases & ground)is supposed to operate when the system
voltage exceeds 6.35 KV. However, in many cases the system
voltage may momentarily rise above this value owing to
switching action or induction-that can easily be tolarated
by the associated equipments(having their individual
tolarances). Under this circumstance, it is desirable that
the LA donot unnecessarily operate especially when the rise
in voltage is within the tolance limit of the associated
equipments. To enable this, LAs with slightly higher value
of voltage rating are provided for a system operating at a
certain system voltage. Clearly, for a 6.35 KV(L-G)system
associated with a 9 KV LA, no damage is expected to be
caused if the system voltage rises by a maximum of 2.65 KV.
Beyond this, the LAs will come into action.
| Is This Answer Correct ? | 46 Yes | 1 No |
Post New Answer View All Answers
what is the difference between neutral and earth
For a three phase induction motor, what will be the effect on motor if the neutral of the system is shifted to say 20 deg.?
HOW WE CALCULATE CURRENT IF THERE ARE NOT PRESENT ANY AMMETER OR MULTIMMETER??????
What is a system?
What is the need for a controller?
how we will deside the high voltage value
hai friends i have BSNL JTO exam on next month so if any body have model question paper or give preparation tips to my mail id kumar4486@yahoo.co.in this will helpfull for my future .plz & thank u by kumar
How time response of the system is divided?
How many sprinklers should be in one pipe line?
How does cost of generation from hydropower plant compare with other sources of electricity?
Define bibo stability.
why don't we use the generator as a motor? and what will happen?
How to test the Secure Elite 440 Multi function meter working condition.
Can clean earth cable be considered as low current cable
WHY THREE PHESE SYSTEM VOLTAGE APPLIED IN 440 VOLT
