Why CT secondary should not be kept open?
Answer Posted / seema
If we kept the secondary of current transformer open, current in the secondary side will be zero, voltage get increased so it will worked as a VT. At the primary side current is maximum so maximum flux will get inducced in the primary side & zero in the secondary side.so, in that case the difference between the primary flux & secondary flux will be more so the counter balance between that 2 flux is impossible.Result will be increased in primary current, increased in core losses.
Is This Answer Correct ? | 6 Yes | 6 No |
Post New Answer View All Answers
From what on-site components does the HT panel monitoring the bus-bars in a 11kV system take inputs?
How many energy meters can be connected on a 15VA Voltage transformer. please send a calculation sheet.
by what factor the starting current is used when comparing star and delta connection for motor starting?
How to calculate flow of water delivered by pump when pressure & size of pipe line is given
What cmos is and its benefits?
Explain the method to keep noises low in a control system?
How two nos. 130 kw D.C motor get synchronise using D.C drive.
What is diversity factor in electric installations?
in ACB breaker requireding 3200Amps. buscoupler getting OFF mode and again it reset and getting normal position give me a required answer?
Can you tell me more about pu systems (per unit systems )calculation in large power systems? how to get the base for voltage and power in generator, transformator and transmission lines?
how net resistance islow in star connection and viseversa in delta connection...? if anybody could explain in detail it wud be helpful.
in the case of 6.6kv motor starter combination contain fuses on it VCB. but in 11KV motor starter combination Fuses are not using in it's VCB why?
we have two generators different capacity on 15 MW and other 6MW at 11 KV , 15 MW gen. bus short level current 40KA,and 6MW short level current 25KA,, length of cable 100MTR between 6 MW from 15MW gen. for bus coupling . kindly tell any one can we use both NGR OR one NGR from any GEN. BOTH NGR has diff. rating. Tariq pakistan
following are the questions asked in interviews: 1) Considering the short circuit fault, which switchgear is preferable, SFU OR MCCB? Which operates faster? whicg one is popular in Indian Market and why? 2)Define SCPD. What is type2 coodination? 3)Why the contactor rating is higher for the fuseless selection than for fuse selection? whether the ratinf of SFU or MCCB remains the same in both the cases? 4)If the HP rating is known then can you calculate the ratings of L.V Switchgear(SFU/MCCB, contactor, OLR) without using the selection chart?
what is the thumb rule for determination resistance of resistor?