Answer Posted / mervin
A CT used for Instrumentation is required to be accurate
over a normal working range , whereas CT for protection is
required to five a correct CT ratio several times the rated
current . Cores made using Nicel-Iron alloy gives accuracy
upto 5 times the rated current n suitable for
Instrumentation . Cores made using Cold rolled silicon
steel are accurate upto 15 times the rated current and
suitable for protection .An accuracy of about 2-3% is
desirable for distance and differential relays .CT burden
and CT linearity should also be considered during selection
of a CT .
| Is This Answer Correct ? | 3 Yes | 0 No |
Post New Answer View All Answers
1)how to reduce the value of tan delta of trasformer and CB,bushing,CT&PT,CVT ? 2)how to reduce the resistance of CB contact and its operating time? 3)plz.....send me the project report on conditioning and monitoring of substation equipment on my email id (gusaiyogendra03@gmail.com)
if main CT is of ratio 50/5, and meter CT is -/5 what will be overall multiplying factor of meter.PT is 11000/110 .
What will be the fault current of any system when its generation is 10% of BASE generation( FUll Load )?Will is 10% or the same as full base calculation?
I have 2500KVA transformer delta/star,13.8KV/380V provided with LV 4000A breaker. Already I have 2300KW motor feeder with a full load 90%. Is it possible to connect another 1600A from that breaker? If so how the calculation is done?
1.why we are using blocks in withoutgaplightning arrester 2.why we ar using bushing in withoutgap lightning arrestor
Why you are switching off arc protection mcb when you are taking shutdown for lv board.
WHAT IS MEANT BY TV TERMINAL IN 500MVA TRANSFORMER?
If we have 11 kv RYB Phase single core cable near about. Then wht effect and losses
Capacitor is load free component but why ampere meter shows current when capacitor bank breaker close?
What is the loss of transformer of 220kv/11kv, 63/80 MVA and 18.05% impedance
Which Class insulation is prefered for the sandwich Busducts ? Why?
How many size of cable required for a 300m long and 30kw inductive lode
We have a distribution transformer of 750KVA/11kv/440v and an AVR (Servo Stabilizer) of 750KVA on the LT side of distribution transformer. Also we have an ACB of 1200A on the output of distribution transformer (that is on the input of AVR). We want to have an MCCB on the output of AVR. What should be the rating?
condition Autotrip facia come on control panel of electrical transmission line?
What is the maximum operating temperature for a thermoplastic insulated cable?
