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Mutair... You have no history of what is installed. Not even motor manuals for the two listed. My intention for you to contact me off-forum was to provide you with Code-related FBN's. Since this forum is viewed publicly, you might be held liable for providing information that can be used in an...

Mutair... I suggest you contact me at [email protected] ! Phil Corso

Mutahir... One more question: Are there any Low-Voltage, Single-Phase, Fractional-HP motors ? Regards, Phil Corso

Mutahir... Four questions: 1) Can you provide a picture of a medium voltage motor's nameplate, especially one 50 yrs old ? 2) What is the "HSE" section ? 3) Do you have approval of the original installation, by the Authority Having Jurisdiction ? 4) Do you have approval of the original...

Mutair... An advisory: Version 2011, has been superseded by version 2021 ! Which one are you referencing ? Regards, Phil Corso

CSA... I don't believe that poor PI had anything to do with Reverse Power Tripping ! ARV stated that the ONLY alarm indication was Reverse Power. His finding that generator stator cable tests indicated that PI was 0.5 Meg-Ohm, which is 500,000 Ohms. It is insignificant and misleading...

ARV1992... Never mind what should happen ! How about listing as many component variables known for each gen-set such as kW, V, A, PF, Exciter V and A, Engine RPM and fuel-rate, and alarms displayed! Regards, Phil Corso

bowtiedvoyager... Yes... you can't! ! A non-latching switch (device) is a plain "Off" Switch which doesn't meet OSHA, IEC or NFPA Standards for an "Emergency" switch (device). Regards, Phil Corso

mnewirag... Following is a 1/03/2003 response to a member of the Control.com forum: "I want to make it clear that my mechanical vibration expertise is limited. I usually get involved when all mechanical vibration causes are exhausted. Vibration due to mechanical failures is quite varied and...

mnewiraq... At no-load an induction motor (squirrel cage) runs at practically synchronous speed; at full-load its speed is below synchronous speed by a percentage known as slip-frequency ! For example, if the synchronous speed is 1,500 rpm and full-load speed is 1,410 rpm, then slip-frequency at...

MRasool, Please see new thread called Cross-Current Compensation Phil

MRasool Following is the original file I referenced covering Cross-Current Compensation:

Alex... One additional (non-electrical) precaution: Make sure the GSU Xfmr is properly distanced, oil-spill containment curbed, and shielded so that fire or oil-leak doesn't affect equipment around it! (Saw this catastrophe happen too many times when Xfmr location was overlooked in planning...

Alex... My comments were to determine if you intended to change the protection system so that Generator and Transformer were protected individually? Or did you intend to combine the two, as is usually done when the Xfmr, in this case serves as a GSU or Generator Step Up Unit. The reason I ask...

Alex... I'd like to help, but as shown, your scheme is not clear. Do you actually intend to reconnect the existing protection PTs, CTs, and neutral from the Generator side to Y-side of the new Transformer? Regards, Phil Corso

Yasir... Can you provide additional information? As I understand it, your goal is to provide (maybe for "black-start" reasons ?) a means to bring power to components of a "dead plant" ? But the only means available is to energize non-connectable, but dormant, higher voltage system's equipment...

Rmthilina... It appears that you have presented the most probable cause... water exposure ! I don't believe I can be of further help! Phil Corso

Rmthilina... How abut some details: Q1) Single-line Diagram, (even a sketch will do)? Q2) Extent of damage. example was switchgear cubicle damaged? Q3) Breaker rating, kV, Amperes,? Q4) kV and Amperes if on-line at the time. Q5) Breaker Service: Generator, Xfmr, Feeder, Tie-line, other. Q6)...

rmthilna... 1) Were there any warning VCB alarms prior to the failure ? 2) Can you provide a test/maintenance history of the VCB's ? 3) Have you contacted Tamco? Regards, Phil Corso