High Efficiency Distribution Transformers

LED lamps ... and their claims!

In a press release the manufacturer claims that this LED lamp »imitates the behaviour of an incandescent halogen lamp and hence will not cause any problems when replacing incandescent halogen lamps with it«.

Now, first of all, regular visitors of this site will realize very little resemblance of these current curves with the usual »behaviour« of halogen lamps, which represent pure ohmic loads.

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LED lamps, electronic converters and ...

Electronic transformers or converters for 12 V halogen lighting raise many a claim over conventional transformers made from lots of iron and copper. One is that the output voltage is regulated and hence offsets variances of the load. Variances of input voltage they do not balance out, but this they also do not claim. So much as an aside.

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Report from IEEE-PES 2010 General Meeting and Conference

IEEE - Institute of Electrical and Electronics Engineers and PES - Power and Energy Society

IEEE is the largest non-profit technical association with nearly 400,000 members in almost 200 countries.

IEEE has about 30% share in world’s technical literature on electrical engineering.

PES, Power and Energy Society is the third largest society in IEEE (39 of them all together) with the largest number of developed and under-development standards of about 400.

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Distribution transformer replacement

What are the decision factors in replacing an operating distribution transformer with a new one

Usually, distribution transformers are only replaced after failing.

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Transformers in power distribution networks

Why do we need transformers? The answer is simple: impedance. If power losses in electricity distribution networks are to be kept within reasonable limits, then large amounts of electric power have to be transmitted across long distances at the highest feasible voltage. In absolute terms, the higher the trans-mission voltage, the smaller the current and hence the smaller the (resistive) power losses in the transmission cables. But increasing the transmission voltage also reduces a given power loss in relative terms.

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