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bob14
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Joined: 16-December 08
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Viewing Board Index Local Time: Mar 11 2010, 12:00 PM
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29 Nov 2009
Hi,
We are planning to install a dozen of VSDs, 7.5 kW 400 V, on a new site. The panel powering the VSDs are loaded with a power factor correction capacity bank. The bank is permanently powered. Having been through the forum, I am wondering how the local capacity bank could affect the performance of the VSDs. The VSDs are of the Siemens micomaster type. Thanks. Bob
10 Nov 2009
Hi,
I am wondering on the effect of running LV motors designed for 380 V operation on 415 V supply. I presume the voltqge rise 9 % should be insignificant. The motor would be slightly overfluxed but should run with less losses. Any comment. Bob
1 Nov 2009
Hi,
I have a 500 kW 400 V slip ring motor driving a load. The current drawn by the motor without load but still couple to the drive is very high, 750 Amps. This is too high for an unloaded motor. This should be the current drawn under loading conditions. What basically could be cause of the high current ? Thanks. Bob
25 Oct 2009
Hi,
I will continue a thread which I started relative to the starting of a fan. The genset , capacity 635 kVA is having trouble to meet the starting demand of the fan, capacity 90 kW. From a theoretical point of view, the Genset should have been able to start a fan of this size but for some reasons is unable to do so. I am thinking of the possibilty to reduce the voltage on the Genset so that the Genset acts as a reduced primary starter. I know that by doing so, the motor will be underfluxed but this will reduce the locked rotor current and the Genset might be able to pick up the load. The actual primary starter is of very little use. Any comment. Bob
21 Oct 2009
Hi Mark,
I have been reading the fantastic papers you wrote on bulk and static corrections. It is a known fact that by implementing power factor corrections, consumers would hardly benefit on k Wh consumption but rather on power factor penalties instead. However, in the case of power generation, improving power factor would also mean that the kW generated by a plant would remain the same though the kVA demand on the generator would decrease. This obviously mean that the current drawn from the generator would be less for the same kW consumption. Does it mean that the generating plant would save on fuel consumption ? I doubt as the prime mover is always rated in k W . Best regards . Bob |
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Lo-Fi Version | Time is now: 11th March 2010 - 11:00 AM |
5 Nov 2009 - 16:41