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Actually, the original data was sufficient to complete two "Negative-Sequence" computations... one covering line-voltage unbalance, the other line-current unbalance. The original 2015 study can be posted if anyone is interested ! Regards, Phil Corso

Oliverm... Attached is an example of a Starting-Time Calc using Excel ! Regards, Phil Corso

Responding to Mahmoud-Diaa Starting-current is the current drawn by a motor during its runup, or acceleration to normal operating speed. Its value is in Amperes. Ignoring the transients of the first 2 or 3 cycles, then starting-current increases (as shown in the motor’s spec sheet) from the...

Kullen Technolgies... "Q.E.D." (sometimes written "QED") is an abbreviation for the Latin phrase "Quod Erat Demonstrandum" ("that which was to be demonstrated"), a notation which is often placed at the end of a mathematical proof to indicate its completion. Regards, Phil Corso

Q.E.D.

Kullen Tecchnologies... So then, it's not an AC Motor ? Phil Corso

Welcome Kullen Technologies In my experience I have never run across a 3-phase, DC motor: a) The nameplate is indicative of a 3-phase AC motor . b) The nameplate is indicative of a field changeable configuration found in AC motors, i.e., Wye or Delta ! c) The magnitude of Volts x...

Heinz... IEC 60076-3 is wrong. Search for IEC Std 60664 or British Std EN 60950. Both cover low voltage equipment. Regards, Phil Corso

CSA... Since I posted the last response to Curious_One, it was to agree with him, i.e., Protective Relying is an Art! And, I've been involved since 1957 ! Regards, Phil

Deji... Q.E.D. ! Phil Corso

Curious_0ne... I couldn't agree more. My teacher and mentor was J. Lewis Blackburn. The course text was the first printing of "Silent Sentinels" in 1957 ! Phil

Deji... Please note, it starts with several relatively simple tests to detect if the Xfmr was unintentionally damaged during the time it was de-energized to the day it's to be re-energized ! If those tests lead to "NO !" Then energize and load it ! BTW, can you provide some info as to Voltage...

CuriousOne... Are there no intentional delays in Reverse-Power tripping logic? Regards, Phil

Deji... Attached is a chart issued by a notable USA organization . It suggests the procedure to use when energizing a transformer, regardless of the time it had been out of service ! Regards, Phil Corso

Amit06212... Thank you for bringing this topic back to the forum. Following is my Readers-Digest-type version, using an Energy Approach: 1) The Gas Turbine part of GTG converts chemical-energy in fuel-burned to mechanical-energy. 2) The Generator part of GTG is a Synchronous-Machine that can...

Thibika... I think you are referring to the Bernoulli equation as applied to a container/tank of liquid (probably water because density is not mentioned) escaping or flowing thru a hole/orifice on the side and at a certain depth below the surface of the liquid in the container/tank ! The "k"...

Ischuerch... I suggest you obtain a US DOE (Dept of Energy) Document called PHAST for "Process Heating Assessment and Survey Tool". It is available from the Internet. It provides the methodology and documentation that will be helpful to you. Regards, Phil Corso

ISchuerch... Where in the process are you taking the measurement? Phil Corso

Ischuerich... Are you talking about "% Excess Air" ? Regards, Phil Corso

Mahmoud-Diaa Ingersoll-rand is a well respected Mfg. What did they say? Regards, Phil Corso