Comments for Electrical engineering Community

Comment on Harmonics overview by Kezia

Kezia — Thu, 09 Feb 2012 10:30:38 +0000

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Comment on Swapping incandescent light bulbs to Compact Fluorescent Lights by Ricardo Senger

Ricardo Senger — Mon, 06 Feb 2012 11:02:50 +0000

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Comment on Schneider Electric sells products with fuses… LOL by Ebrahim

Ebrahim — Mon, 06 Feb 2012 07:29:01 +0000

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Comment on Busbar and distribution systems in electrical switchboards : make or buy? by Raina Willcox

Raina Willcox — Sun, 05 Feb 2012 11:54:16 +0000

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Comment on IEC 61439 : frequently asked questions by Leonel Goebel

Leonel Goebel — Sun, 05 Feb 2012 06:48:47 +0000

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Comment on Warmth, cold, humidity: the proper atmosphere inside the enclosures by victor chinasa

victor chinasa — Sat, 04 Feb 2012 19:11:15 +0000

please can some one help me to solve this mathematical problem. this is the question solve the transcedental equation 2x+cos(x-1)=3 where xE(0,2),subject to the provision of error tolerance of 0.0001. the question is under numerical method. please i will be vary happy if someone can give me the solution of the above question .

Comment on Parallel transformers benefits by Sinisa Spremic

Sinisa Spremic — Fri, 03 Feb 2012 11:08:56 +0000

Disadvantage of circulating currents is increasing of losses. Load sharing is connected with different short circuit impedance (mainly reactance because R< Parallel operation methods for parallel operation of transformers imply circulating currents minimization so circulating currents (which could not be fully removed due to different factors) are at low values and thus circulating currents increase losses at very low level.
Of course increasing overal inductance (reactance) using inductors (transformer reactance+inductor reactance) will effect in circulating current reduction. Load sharing could be equalized if added inductors equalize overall impedance (reactance) among transformers.
Inductors built in secondary side of transformers could help to decrease short circuit currents in places where it is necessary.
My opinion is that there is no need to add inductors on secondary side of transformers regarding to parallel operation of similar transformers (circulating currents and load sharing) because of inductors costs, increasing maintenance cost, decreasing reliability (more devices), need for new parametrisation of protection devices and automatic voltage regulators, etc).

Best regards, Sinisa Spremic

Comment on Parallel transformers benefits by Thomas Rooth

Thomas Rooth — Thu, 02 Feb 2012 10:23:31 +0000

Question regarding possible elimination/reduction of the disadvantiges of circulatig currents, load sharing etc.:
Will the adding of inductors on the secondary side of each transformer help. It’s obvious this cause higher cost but in spite this disadvantage, will it help?

Kind regards,
Thomas Rooth

Comment on Parallel transformers benefits by Sinisa Spremic

Sinisa Spremic — Wed, 01 Feb 2012 12:56:08 +0000

Mathan!

Your question is ambiguous.

Best regards!

Comment on Schneider Electric sells products with fuses… LOL by vending machines los angeles

vending machines los angeles — Wed, 01 Feb 2012 12:56:08 +0000

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