Interested to Buy Any Domain ? << Click Here >> for more details...
What is different between Metering CTs and Protection CTs?
- 4 Answers
- 15000 Views
- I also Faced
- E-Mail Answers
Answer Posted / ramesh kumar k
Mr. RK is partially right.... I will tell you clearly...
CTs are of 3 types depending on their usage... they are
1. Metering 2.Protection & 3. Special Protection(PS)
Metering & Protection CTs name itself self explanatory.
In metering CTs our main aim is to measure the currents
without damaging the instruments (i.e. Ammeters) connected
to it... so at fault levels (i.e. high currents) the
secondary also indicates corresponding heavy currents... so
the meter connected to it will gets damaged... (A 5A
ameeter can't measure 50A)... inorder to make the meter
safe... we will prepare the core of the meter in such a way
that at faults currents the metering CT core gets
saturated... and it will not induce any more current in the
CT secondary... so the current in secondary ckt. is ZERO.
So the meter is safe... THIS METERING CT WILL BE WORKING
WITHIN NORMAL RANGE OF CURRENT AND WILLNOT WORK IN FAULT
CONDITIONS (IT WILL NOT GIVE OUTPUT).
Where as Protection CT will have to work only in fault
condition. Because the line has to be protected in fault
condition only. The core of this CT is made in reverse to
that of metering CT. It will not saturate in fault
condition and still give the output to the relay...
Thats why Metering CT can't be used for protection
purpose... and protection CT can be used for metering but
it will not meet the accuracy requirements (If accuracy
requiremets are compulsory... prot CT can't be used for
metering)
Where as
| Is This Answer Correct ? | 32 Yes | 1 No |
Post New Answer View All Answers
Explain in details how you would react to an unexpected incident when your supervisor or manager is not around to give instructions?
How is operate breaker failure scheme in substation
why it is not advisable to run low rating (19KVA) DG sets in parallel for long durations even though they are provided with droop ckts (QDC)
What is the name of the winding from which the supply is taken for load connections?
How does a transformer contribute towards the widespread popularity of ac system over dc?
What was the Dg set radiator and lube oil temperatures trip in ACB
I am experienced with house and industrial wiring but I don't have any licence how can I apply an licence and which type of licence i can get i didn't complete deee just only experience
Can Anyone Answer anyone of these ? Q1) why direct SOLUTION of Load Flow Studies in Not Possile ? Q2)Why majority of Buses in power system are load buses Q3)Why one of the buses in Power system is taken as reference bus (slack or swing) Bus ? Q4)Bus Admittance Matrix is a sparce (means it contains some zero elements ) matrix , give reason
Merits & Demarits of Oil circuit & Air circuit breakers ?
how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?
what is the ATS .And how it works.
How we calculat the NGR of 3phase Generator, Our generation voltage 11KV
Installation resistance for whole installation of 16 kva & 25 KVA DTRA a) Between each conductor b) between conductor to earth c) installation resistance for each apparatus, each conductor to earth d) earth resistance for the system of earthing
At the starting of dc motor and syn.motor and induction motor high current flowing through the winding. Due to this the windings burnt out. To avoid this different types of starters are used. But incase of transformer what Will be used (At starting no emf is induced in the primary winding)?
what questions are asked in the interview for the post of an electrical maintenance engineer in FMCG companies?
