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Opss.. sorry for the acronyms. and, thank you for replies LA = Lightning Arrester, CVT = Capacitive Voltage Tx, DS = Disconnecting Switch (E=Earthing), CB = Circuit Breaker, CT = Current Tx. Next question is : How about Lightning Arrester (or Surge Arrester?) ?? it is recommended to connect...

hi, at a 150 kV conventional substation (air insulation) that has LA, CVT, DS+E, DS, CB, CT, Tx, which one of these apparatus should be connected to grounding mesh? and, which one should not be ? thank you.

Hi, i'd like to know, if there's any link which could be visited to learn more about HV T/L Tower Typical Tipe (Aa, Bb, Cc, etc) thank you

Hi I'd like to know, what points should we consider while choosing EHV (275 kV) switchyard busbar conductor or equipment conductor? i.e. AAC vs AAAC? thank you

hi. how do you determine OH conductor ac resistance when dc resistance at specific temperature is available?? thank you

Hi. i already have arrester with rated voltage is 144kv for 150kv system voltage, how do you determine the rated voltage of an arrester for 275kv system voltage? type metal-oxide w/o gaps. IEC60099-4, tabel 2 gives range of rated voltage 96-288(kv r.m.s) with steps of rated voltage 12kv...

Hi, in order to run / operate electrical network, which type of power factor should we keep having? if a system runs on leading power factor, what is the main effect ? does it matter to have leading or lagging? since it just depends on the type of loads thank you

Hi, i'd like to know where should i install CT for REF, before (upstream) or after (downstream) 40 Ohm NGR on 150/20 kV 30 MVA Tx ? thank you

Hi, what is the main purpose? if you install a Lightning Arrester (or Surge Arrester?) with a power transformer 150/20 kV 60 MVA on HV side. as lightning protection or switching ? best regards

hi, what does it mean when a cb comes with "O-0.3 s-CO-3min-CO" as it's operating sequence rating? thank you for any help

Hi, I've been trying to find any standard on the net (IEC, NEM, etc) about the maximum (or minimum) value of grounding resistance for a substation. I appriciate any help. Thank you.

Hello, Let's say there's a power transformer : 480/230 VAC, should we *always* use it as step DOWN? by connecting the source (480 V) to HV side and load (230 V) to LV side? or can we use it as step UP transformer? by connecting a load (480 V) to HV side and source (230 V) to LV side. I...

Hello, i need help lets say there's a power system network, and i want to determine remote (and local) source impedance on two terminal (a transmission line), how do i calculate the remote source impedance ? or at least, where do i go to learn about this ? thank you