What is the difference between CT for protection and Ct for
metering?
Answer Posted / p.raju
yes , There is difference between the protection ct and
metering CT in operating conditions
*The CT using for protection will have to carry the fault
currents which are 10 times the normal full load current
thats why it is designed at much bellow the saturation point
(knee)inorder to aviod saturation.
*The CT used for metering will have to carry only full load
current thats why it is designed near to knee point.
as per accuracy concern the metering Ct should be more
accurate under normal operating condition.....i.e under
normal operating condition the pretection CT accuracy not
imp..........
Is This Answer Correct ? | 409 Yes | 15 No |
Post New Answer View All Answers
Which type of a.c motor is used in the fan (ceiling fan, exhaust fan, pedestal fan, bracket fan etc) which are find in the houses ?
what is the practical application of full adder circuit?
how to identify conection leads of an unknown electric motor
hi everybody how to design string combiner box (scb) internal parameters like bus bar and spd (surge protection device and fuse which place to set that,and also bus bar one particular cross sectional how much heat generated and how much power loss tell me Clearly and briefly
What will be the output voltage of a transformer if it is primarily energized from a square wave voltage source?
In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.
whats the existence of reactive power and when it arises?
1)How much current can a 3-1/2 core 100 mm wire carry? 2)What are the special cables required for explosion proof wiring? 3)In case you do not have coal and salt for earthing, how can you achieve good temporary earthing? 4)One horse power single phase motor is more likely to get hot than a one horse power 3 phase motor. Is it true or false, if true why? 5)What are the different types of soft starters for large motors?please explain?
can u describe the method used for protection of transmission line.
How will you define capacitance?
In electrical what is earth(ground)connection, wht is the importance of it, why it is recomended to maitain below 3VAC between Neutral and earthspecially in PLC used machines?
what is frequency response?
what is the difference betweem star connected motor & delta connected motor?
PLZ EXPLAIN THE INTERLOCKING AND CONTROLLING OF CONTACTORS????HOW CAN I DO THAT?
High voltage test procedure of in swgr board. why should measure millivolt drop on testing time?