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Persie... the current values you listed yield an Ampere-Unbalance-Factor, AUF, of 3.7% if you comply with NEMA standards and 3.8% if you comply with IEC standards. Can you answer the questions I listed in Solo’s post as well as the two below? (7) What is the current magnitude measured...

Arjun Sharma... to start the investigation into your problem: 1) Has the motor ever been started while uncoupled from the driven machine? 2) Do you know what the bus-voltage was at the instant the Soft-Start controller was energized? Regards, Phil Corso

Jim... 1) Is daily load heavy-industrial, or light-maufacturing? 2) What is load in kW, and Power Factor! 3) Is xfmr the dry-type or oil-immersed? 4) What are primary and secondary voltages? 5) Is xfmr outdoors or indoors? 6) What is average ambient-temperature? 7) On the...

Shaheed... see Control.com Thread: http://www.control.com/thread/1026216510 Regards, Phil Corso

Souvik Ghosh... following are answers to your questions: (1a) Typically Grid-connected PV-systems are shutdown upon detection of Grid-loss! (1b) If the voltage on the Grid-side is too high, the PV-side is shutdown! 2) If the Xfmr is 2-winding, the Tap-Changer can be connected to the...

Jeet... it will be easier to explain if you would provide what the corresponding armature-currents were for each of the conditions you cited? Regards, Phil Corso

Jaypot... testing requires knowledge of the relay used. Is it analog, solid-state or microprrocessor based. Also, a single-phase unit is normally used, but sometimes it can be three-phase. Can you provide detail as to the manufacturer? Regards, Phil Corso

Moh.Saleh... how many seconds is a "few"? An uncoupled motor of the size you cited should take no-longer than 1 second to reach rated-rpm, at 100% voltage, regardless of whether it is a 2 or 4-pole machine! Regards, Phil Corso

Roberto... [email protected]

Roberto... I wanted to know the nature of the community load, i.e., lights, refrigeration, pumps, etc! Phil

Roberto... I am deeply involved in Alternative and Renewable Energy Management and I can assure you the IEA Methodology is intended for those with LOTs of money (as alluded to by CSA.) If you want specific detail contact me off-forum! For the loads you cited following is a list of basic...

Roberto... can you provide us with some idea of the mini-grid load? Phil

Stacy... did you give up? Phil

Roberto... addition to my earlier post: 1) ... The blocking-diodes will then permit you to monitor output Voltage, Amperes, and Power, from each generator! Regards, Phil

Roberto... I suggest you consider 2 automobile-alternators, each driven by a Diesel-engine! 1) Since their outputs are DC, parallel them to the same load-bus via blocking-diodes. The diodes will permit you to monitor the output voltage of each generator! 2) Connect the various loads, if...

Home... correction to earlier post: 400kW Genset is rated ~470 kVA if Power Factor rating is 0.85! Regards, Phil

Home... The 400kVA gen-Set should be adequate to start the 200kW (~270 Hp) motor using a Soft-Start Controller. Unfortunately having just nameplate-data is insufficient for a proper analysis! Can you provide the additional information requested? Regards, Phil

Home... I neglected to ask: 4) What system voltage, i.e., 230 or 400Vac? Regards, Phil

Stacy... you are correct about my screwing up the bus IDs. Frankly, I don't believe you will have any appreciable circulating-current in the loop! The reason is that the existing xfmr-taps can be tweaked to reduce circulating-current to an acceptable minimum. Do you still want to determine...

Home... 1) What is the Nameplate Inrush factor, kVA/Hp, of the motor? 2) What is the Motor driving? 3) What is the starting-current limit presently set into Soft-Start Controller? 4) Is type of AVR is provided with Gen-Set... typical- or fast-response? Regards, Phil Corso