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Jacek, you are absolutely correct! However, I have always advised using the 'f', which is based on the German DIN system, to help remember that the value is based on weight and not mass! In a related subject I also advise the use of the term 'mt' for meters, ad not 'm'! Regards, Phil

S. Sharath Given the Moment-of-Inertia, Jm (in metric-units), then the Moment-of-Inertia, Je (in English units) is 5.93 times greater. Example: Given Jm = 10,000 kg(f) - mt^2 units, then Je = 5.93xJm or 59,300 lb(f) - ft^2 units. Phil

Magesh, let's look at the general case when the Incomer-CBs are closed and the Tie-CB is open. Then, the Incomer (source) CTs are carrying, say, normal load-current, while the CTs at the Tie-CB have zero current. In this situation the 87s operate as typical over-current relays. It is...

Isaacluna... are you referring to a single-phase or a 3-phase source? Regards, Phil Corso

S. Sharath, I believe you have overlooked the difference in the definition of flywheel-effect: By definition, the German term, (GD²/4) is equal to the English term, (Wk²)! Note the parentheses! That is to indicate the terms are Symbolic, and should not be taken literally, because...

Piki... The secondary of one of the CT's is probably reversed. Regards, Phil Corso

Sohaib... can you correlate events: o Day or night. o Good or inclement weather. o Hot or cold periods. o Particular loading. o Shift-change. o Recent change in operation. o Recent maintenance on circuitry. o Presuming 3x1c, have shield interconnections been altered...

Sohaib... can you furnish more details, such as: a) Type of cable. b) Shielding technique. c) Grounding (earthing) method. d) Charging current. e) Type of CT's used. f) LV interconnecting wiring between CT groups; 4-conductors or 6, single or multi-conductors, shielded, or not...

Read CSA's Post in: http://control.com/thread/1427481373 Regards, Phil Corso

Lukee Ans to your 1st query: Yes. Voltages across each load will differ. Ans to your 2nd query: Yes. However sum of 3 line-currents will equal zero. Call the load's midpoint its centroid. Then the voltage between the centroid and system neutral is referred to as displacement voltage...

Amritanshup... further to my earier post, I suggest you read: http://control.com/thread/1416239859 Phil Corso

Amritanshup... is your machine grid-connected, or standalone? Regards, Phil Corso

Lukee.. . unless the load midpoint is connected to the voltage source neutral, there is no neutral-current. Furthermore the voltages across each branch of the load will be different, thus exposing one, or two to over-voltage, because of the phenomenon called, "Neutral Displacement." (more...

VJP... Please note that for simplification purposes the Sqrt(3) multiplier, related to the 3-ph case, has been intentionally omitted. Phil

VJP... An AC generator (more aptly, an Alternator) produces two time-varying electrical outputs. one is terminal volts (V), the other, armature-current (A). Both, sinusoidal in nature, are usually separated in time. That time-difference is expressed as a third variable, eg., theta, in...

Further to earlier post... http://www.control.com/thread/1026165830 Phil

Masoud... although the numbers don't exactly match, it "sounds" like a broken rotor-bar, or bar-to-ring failure. I suggest you search Control.com Archive for "AM portal-radio to detect rotor-bar failure". Regards, Phil Corso

Mark... what has happened or makes you think will happen, to question the capability of the 40kv disconnect switch to interrupt the excitation current? Regards, Phil Corso

Thirumoorthy... Insert just the 10-digit number into the "Search The Site" Box! If you are still unable to retieve the Threads listed, contact me at: [email protected] Phil Corso

Thirumoorthy... search Control.Com Archives for: o http://www.control.com/Thread/1026235703 o http://www.control.com/Thread/1259307998 o http://www.control.com/Thread/1329770308 Regards, Phil Corso