Siemens DTU3005-B Spezifikationen PDF herunterladen (Seite 6)

Distribution In order for generated power to be useful it must be transmitted

from the generating plant to residential, commercial, and

industrial customers. Typically, commercial and industrial

applications have higher demands for electric power than

residential applications. Regardless of the size of the electric

system, electric power must be supplied that allows the

intended loads to operate properly.

The most efficient way to transfer energy from the generating

plant to the customer is to increase voltage while reducing

current. This is necessary to minimize the energy lost in heat on

the transmission lines. These losses are referred to as I

R (I-

squared-R) losses since they are equal to the square of the

current times the resistance of the power lines. Once the

electrical energy gets near the end user the utility will need to

step down the voltage to the level needed by the user.

Power Quality Electrical equipment is designed to operate on power that is a

specific voltage and frequency. This power should also be free

from quality problems, such as voltage spikes and harmonics.

Unfortunately, power quality problems can occur from various

sources. Power quality problems can affect the performance and

shorten the life of electrical equipment. Power quality problems

can significantly increase the operating cost of an electrical

system.

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Siemens DTU3005-B Spezifikationen Seite 6