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Question
How CT & PT ratings are decided for a 11KV or 33KV
transmission line?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
CT PT ratings are decided on
1. Class : Protection, metering (for CT)
2. Burden: The load of relays, cabling, etc.
3. Fault level: The thermal capacity of CT for bearing the
fault current for required time 1 sec, 3 sec etc.
4. The voltage level of the system
 
Is This Answer Correct ?    11 Yes 1 No
Balasubramanian
 
Answer
# 2
ct decied as per metering OR protection ct Use ct as per
metering that we can use the metering instrument of panel
OR control room 1A OR 5A
 
Is This Answer Correct ?    10 Yes 4 No
Pradeep Kumar
 
 
 
Answer
# 3
In CT

CT primary rating will be decided by its load current &
secondary will depend up on purpose of of selection (either
metering or protection )

In PT

It will always depend upon its system rating & in secondary
the class will be depend upon its purpose of its
utilization as same as in the CT secodary. but the voltage
level is always 110V in secondary of transformer.
 
Is This Answer Correct ?    1 Yes 2 No
D.durga Prasad
 

 
 
 
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how to calculate 'In'in a system?   2
Which types of Gases occure when mineral oil burnt   1
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what are the safety of chiller.   3
why the carbon brushes are used heat created rotating parts in eiectricity   1
3 measuring instrument for transformers?   5
In ACS 1000 drive we used 12 pulse convertor.Why dont used 6 pulse or 3 pulse convetor   1
Will The Rated Capacity of 20 MVA ,220/6.6 KV, ONAN cooling Power Tranformer be increased up to 25 MVA with respect to its %Impedence by ONAF cooling with same rating..? Ambuja 2
why transformer is giving some humming noise .....? JSW 10
In a house wiring why we are using only one neutral wire and so many phase wires from the main board, when the load is common for both wires?   3
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.   6
what happen if we supply 220v dc suppy to the bulb or tube   2
 
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