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While CSA's practicality of use is right-on, I believe the top two characteristics, after economy, are the vaporization factor, and the ease of cleansing H2 of the purge-gas, if required. Phil Corso

Chazree... the fact that starting-current exceeds a CT’s nominal rating has no deleterious impact on the CT! However, this statement presumes: 1) The selected CT-ratio conforms to the motor’s nameplate NEMA Design Code Letter (Inrush-kVA/Hp ratio.) 2) The starting-time (breakaway to rated...

I will gladly provide on-forum answers to questions asked off-forum, about supplying an alternator's field-winding with AC excitation, rather than DC! I only ask that a reader, not encumbered with a PtP's mind-set, have the fortitude to ask, here on-forum! Regards, Phil Corso...

To those interested... upon the advice of a superior gender, following is the on-forum answer to the Electrical Puzzle! But first, o I want to thank those men that contacted me off-forum for having the common courtesy to remove their cloak of anonymity. o A caveat to PtPs... the answer...

I was recently conacted off-forum with two questions related to this thread: 1) What is the alternator's output waveform equation? 2) What would the alternator's waveform be if the AC field frequency and alternator's rpm were equal? If anyone is interested in my reply, contact me off...

Ajinkya... how about light-refraction? Phil Corso

Mani... please bear with me, but I want to be sure we understand each other! Therefore, I am taking a few steps at a time! Q1) What was the duration (in weeks) from startup to the 1st failure? Q2) Do you have pictures of the failure(s)? Q3) Has a metallurgical analysis been made...

Mani... what was duration (days, weeks, months) between failures? Regards, Phil Corso

FAM... Just ignore the thumbs down. C Can you provide the information in the second part of of my response? Phil

FAM... while the ground-fault may have triggered the event which resulted in damage to the load-gear. I wouldn't say it was the the root cause. More likely, it was mal-operation of the unit's protective relaying Can you provide details relative to the relaying,such as hardware or software...

DRP... In my experience, pressure was held above 12.5 kg/sq cm. Also, effectiveness very dependent on nozzle selection. Phil

GDD.... the intro to your post discussed lead failure. If they are stator-winding terminating leads, then either they are improperly supported to resist movement or flexing, or wire size is too small. If they are connecting field-coils of a salient-pole machine, then inspect for pole...

DRP... if you mean dry ice pellets or shavings, then what was minimum pressure of blast gun? Phil Corso

Isar... take a look at: o http://control.com/thread/1026209342 o http://control.com/thread/1026211569 Regards,Phil Corso

Sunil... I don't want to turn this thread into brouhaha, but synchronizing-power between alternators is essential. Even for multi-machine mega-systems. And, some believe lack of it could be responsible for inter-areas oscillations that have recently appeared… especially when large wind-farms...

Sakthivel... please provide answers to the following questions: Q1) Nameplate data? Q2) Ambient temperature? Q3) Motor temperature? Q4) Duty-cycle? Q5) Line-line voltages? Q6) Line-currents? Regards, Phil Corso

SD... you are on track. Ignoring charging-current and OVH line-impedance both ends are indeed at the same frequency and voltage. However, one of the parameters the Sync-Check relay measures IS NOT within limits. BTW, because of the high number of negative PtP responses aimed at my posts...

Mark... can you identify the type of oil? Phil Corso

Sunil... why do you insist on introducing a mechanical version of the operation of an electrical generator, and a 'load' in your explanation I suggest re-read the 1st paragraph of the original post. It includes the definition of 'polarity'. Phil Corso

Sunil... your post to this thread proves you are a true contributor to this forum. Responding to your comments: 1) If you notice, I talked about two un-loaded alternators! Load-currnt does not enter into discussion. 2) You have confused 'polarity' with 'phase'! 3) If the two...