Why dc supply is used for closing and tripping coil of ht
breakers. What happen if we use only ups ac supply only.
Answer Posted / satyanarayana
Suppose if breaker was tripped on under voltage then Ac supply is not available at that instant so that breaker will not trip if AC supply is used for breaker closing and tripping.
Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
how to calculate micom relay earth falt time and current sertting
what is the importance of earthing system on the generators big capacity and small?
Efficient electrical earthing in hard rock area
full form of electrical?
why we take movement of rotor always in counter-clockwise direction in 3-phase induction motors?
1 “earthing” for bonding of equipment and circuits to common plant earth electrode potential, 2 “protective earthing (PE)” when this bonding is required for personal safety provisions 3 “grounding” for interference suppressing bonding of screens, sys-tems with ground level 4. low-impedance earthing ? 5.primary earthing system and secondary earthing system what is that? 6.earthing electrode or mesh net earthing electrode ? very confusing , simple but very informative help required ? i will be very very thankful to you guys.
what is effect of leading power facter on the system and billing
How much load can take a 16 mm aluminum cable 3 phase
How to Make relay co ordination chart for a Electrical power distribution of a plant
Hello everyone, somebody knows what is a "surplice power" ? The hole phrase is: "This rating is appropriate for a generator set paralleled with an infinite bus e.g. a national electrical supply network or grid where the generator set is run at 100% load, 24 hours a day, 365 days a year and any surplice power is exported into the grid" Thanks in advance.
if we look on phasor of the transformer vaoltage is 180 oppsite at primary and the secondary so to improve a power factor is secondary should kept negative to improve it primary side means is -.90 became +.90 at other side
what is differentila pilot supervision in the incomer control panel in the power station?
What test must you do before powering up a circuit that you have been working on?
In 90 kva alternator that produce the output voltage is 115(p-n),200(p-p) at 1500 rpms means what ampere it produced ?
What are the ratings of VCB, MCB, MCCB, SF6, ACB, and OCB?