Recent content by sushilksk

CT location on 13.2kV side should be below tap point for correct operation of differential protection. Further, relay current at full load current on 13.2kV side will be 328A, which is too high to handle and not a good option of CT ratio.

What you mean by "magnetic flux outside the iron core"? I have used term "DC offset" instead of "zero offset", both are same.

It is due to saturation of magnetic core. In steady state, Flux produced in one half cycle is cancelled out by MMF of next half cycle. During charging, we need to close CB at exact point on wave (taking residual magnetism in account) to acheive normal current levels without any inrush...

In this case THD is 2.7% and difference in neutral current is >50%. There should be some other issue.

Neutral current should be = Vector sum of currents in all three phases. So, you need phasor angless.

From this, CT polarity is the probable cause of trip. Checking CT polarity and correcting is the solution. Further, regarding single point earthing for CT secondary circuit: Generally, one side set of three phase CTs make has siingle point earthing. And other side set of three phase CTs has...

Practically, I have seen one CT failure due to CT open circuit in metering core at 132kV level. In all other cases, there was another current path developed by melting of cables / terminal blocks etc.

violent failure of CT with explosion: It depends, if it is dead tank type CT with oil filled and porcelain housing, pressure developed can explode CT. In some cases over voltage can create insulation failure of cables, or terminal blocks, causing short circuit of CT secondary. In this case CT is...

DC earth fault locator kits (based on low frequency injection) are avaiable, which does not require isolation to some extent. But it needs expert person to identify exact location.

"bay controller unit" is an IED used for control and monitoring. It has all the functions of LCC and can be operated from Local or remote SCADA.

Are you talking about three positions: [ol 1] Disconnector close, Earth switch open Disconnector open, Earth switch open Disconnector open, Earth switch close [/ol] It has advantage of having only one drive mechanism for both disconnector and earth switch.

Temperature is missing in this rating. 105AH will at a particular temperature (Normally 27 deg C).

Does low inrush current is oberved always in C-phase, or it is changing randomly with every attempt? Is there any controlled switching device?

CT star point is formed in the yard for EHV and UHV substaion.

IMO, arc cuases melting of conductor. After melting, molten material will go down by gravity.