Interested to Buy Any Domain ? << Click Here >> for more details...
why we use REF and Differential Protection in one
transformers?my doubt is both protections are operated in
internal fault only.why we want to use 2 protections?please
clarify.
- 7 Answers
- 28054 Views
- I also Faced
- E-Mail Answers
Answer Posted / munish
REF 64T is used for protect the 95% winding of T/F.it sens
only the internal fault of T/F and 51NT circulating earth
fault relay used for detect the other area.
87T diff. is act only when the difference B/W both side
current is more than setting value
| Is This Answer Correct ? | 0 Yes | 8 No |
Post New Answer View All Answers
How we can determine short circuiting current any plant and for example a plant which power generation is 415 volts and plant load is 500 kw.
which is better to use svc or synchronous condenser why ?
what is difference between speed mode and torque mode in motor?? explain in simple words please.
What is Percentage impedence of a transformer? why it is expressed at a percentage? what is the importance of percentage impedence in case of a transformer?
DRAW ACIRCUIT DIAGRAM OF 100 KVA 415V/55-0-55V DELTA TO STAR TRANSFORMER
Why the dc voltage drop during starting of emergency lube oil pump? The Voltage drop from 135kv to 125 kv for one min. before re-establish to 135kv?
How many gap between finger contact in a.c.b. and v.cb.?
if you are in a software company,then why do you want to come in a core company like sail, ntpc(where lots of trouble like tension but you have a good life in a it company) ?
how we calculate the short circuit capacity of the busbar in LV & HT?
when generator short circuit condition, the current how dissipates. or at short circuit voltage not available then current how can flow?
what is the calculation method to design core and winding of a 200kva 3phase distribution transformer?
How to decide the size of the capacitor for a single phase induction motor say 2 HP ??
what is the current setting for different relay protection for transformer .
In single phase capacitor motor, if the motor rotate reverse direction then how much power will be consumed by the motor and why?
PAC and simple Ac different
