Answer Posted / rahul sharma
BDV tests is used to test the dielectric strength of the
transformer.
A new transformer oil shol\uld have at least dielectric
strength of 39 KV as per british standards.
Transformer oil used are normally tested using ASTM D877-82
with the KV strength testing,using 1" electrode spaces 0.1"
apart & test voltage increased at 3000 volts\min until it
breaks down. The avg KV obtained after 8 trails is
considered the oil dielectric strength.
Using this test dielectric strength at 30KV & above is
considered good. Dielectric strength between 23 to 29 KV is
considered usable ,but requires filtering, below 23 KV
transformer oil should be replaced.
| Is This Answer Correct ? | 41 Yes | 8 No |
Post New Answer View All Answers
What is BusBar integrity test and how it is conducted?
What are protections for dty type transformers
What are the advantages of a three-phase system over a single-phase system?
what is effect of leading power facter on the system and billing
Why GRR starts from 60% of motor speed why not less than 60%?
Why open circuit test of transformers is conducted at rated voltage??Why not any other voltage??
An ELHNC 80amp 240v 30mA RCD is tripping periodically, every 30 - 180 seconds is it safe to disconnect the protection circuit?
a)In a 3-phase 4-wire circuit, a circuit breaker is selected to protect the circuit whose highest fault level is 6.6 MVA. Determine the required minimum breaking capacity in kA. (Note: Covert 3-phase power in terms of kA to find answer.) b)Using the below, determine the required minimum making capacity in kA as a “peak value”. Rate breaking capacity (Icn) ka: Icn<= 1.5 Factor = 1.41 1.5
working principle of oil startar
what r PID controllers?why they r used?what is there purpose?plz Explain in detail
What is the effect on in Zone and out zone fault if Phase side CT is Vk/2<30 mA and Neutral side is CT is Vk/4<30 mA for Transformer REF protection
What is relation between mu(nought) and epsilon(nought)?
What is the phase relationship between the primary and secondary voltages of a transformer?
What is the formula for calculating the Instantaneous Short Circuit & overcurrent for any breaker
what is the electrical?
