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Hi, As you know the Static Var Compensator SVC consists of branches TCR, TSC and Filters. Can anyone give explanation why we can't do a smooth controlling in capacitors instead of fully conducting or fully off? Thank you SMB

Hi everyone, I understand the application of CT Open Circuit supervision in High Impedance Busbar protection. Could you please explain why we don't use it in High Impedance REF scheme. thank you,

Dear All, I am talking about Double Wye ungrounded Capacitor Unbalance protection using Neutral CT and neutral VT as explained in IEEE C37.99-2000 section 8.2.6.2. i have 13.8KV capacitor bank double way ungrounded and both unbalance protection approches are used: CT approach: CT will be...

Hi, can any body explain the application of under current protection in capacitor bank feeder?

Hi everyone, i have HV cable with shunt reactor connected through circuit breaker. in case of line protection operation, should i trip the shunt reactor or leave it connected? thank you,

Hi, I have distance protection relay used for 33KV radial line around 80 KM long with more than 150 Distribution transformers. this relay have been operating by Zone-1 many times at energization due to high inrush current 800 A while the maximum feeder load is 200 A. to avoide this situation...

Hi everyone, I would like to know where is the best location to ground the CT secondary "one point only" is it at SWGR CT Box, LCC or relay panel? and why? thanx

Hi everyone, Could you please explain the difference between static, digital and numerical relays in terms of technology ? thank you very much

Hi, AutoRecloser setting: is it protection or operationility staff responsibility? We all know that A/R relay or function is under protection responsibility in term of setting implementation, testing shcheme, .. etc. However, the setting of the relay should come from operation/planning people...

hi everyone, for fault recorder equipment, some people call it Digital Fault Recorder DFR while other call it transient fault recorder TFR; which one is more correct?

Hi, Is there any standrad reference for acceptable rage "in percentage" of transmission network losses? Thank you very much

Hi, my question is: Does unbalance current increase the power losses? and how? Thank you very much

Hi, usually TCR doesn't produce 3rd harmonics components, but i have seen 3rd harmonic filter in one SVC installation. when i asked the people there, they told me TCR can produce 3rd harmonics in case unbalance is inherent in the system. Can any body explain more? thanks

hi every one, my question is as in the subject, do we still need to add stand-alone tripping relays? what is your practice? thank you,,

Hi everybody I have two time setting of the AVR relay T1 & T2 Type SPAU341C. I want to consider the operating time mechanism of the Tap Changer and then add it to the time setting. My question is how much time tap-changer does need to perform one operation? Note that I have 69/13.8KV Xfmr...

Dear All, Currently, our engineers writting a specification of installing a Fixed shunt capacitor (FC). But in future project they may replace the FC by SVC. Now, What shall they consider in the FC specification to use them as a filter when TCR installed. thanks and regards SMB

Hellow, every body In our dispatch center i have seen that when the dispatcher raises the tap form the HV side, the following happened: 1. The voltage in the secondary increased (Which is OK and expected) 2. The voltage in the primary (HV side) reduced ??? (N1/N2)=(V1/V2) V2=(N2/N1)*V1 From...

I have 69/13.8KV Xfmr Delta(HV)/Way(LV) I want to set the –ve seq. relay to coordinate it with OC protection in the LV side If the L-G fault is 4500 A. What is the value of the –ve sequence in the HV side I got the result from Aspen Oneliner but I could not get the same result by hand. So...

I would like to see your suggestions for using the new ABB formula that used in CT calculation.