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The special material for semiconductors generally has the resistance between the resistance of a conductor and a non-conductor. Changes in temperature or added dashes also influence the resistance.

The word “impurities” means the other components mixed to the material. Semiconductors are labeled as power semiconductor devices of type-n or type-t due to the components of complete material.

They make diodes and transistorsthese types of semi-conductors. Usually silicon is applied to make semiconductors now.

Semi-conductor substance is applied to create diodes that are good for putting the stream of electrical current just in one direction. There is a component of + (positive) construction, - (negative) construction and so-called pn-transfer appointed as barrier level in every diode. Diodes produce electrical schemes changing between direct and alternating electrical current. As diodes let current stay just in a single sense only half of the period or cycle is completed. They call such a connection a rectifier.

LED (light diodes) is one more type of diodes. Such diodes are applied in case it’s important to create light at little voltages and at the same time get no warmth. In PC, photo cameras and mobile telephones, various devices today one can see light diodes as those diodes are used to show the on state.

Moore’s law gave way to the growth of thyristors industry. Lithography is the most significant factor of producing complicated power semi-conductor gadgets at lower cost. As for optical lithography, it now leads to the popularization of new techniques because it has come to its physical limit. Today ultraviolet lithography and nano-imprint lithography are supposed to be the best alternatives to optical one. X-ray lithography and electron beam lithography now are also thought to be of big potential.

In Russia pulsed power devices were invented. Specialists use those sensors to do lots of actions anywhere. The voltage sensors may be used in either commercial, industrial or daily applications. The shape and size of the igbt sensor can change from those little light detectors to complicated gadgets reacting on radiation motion.

If not supplied the igbt sensor won’t do. There are lots of purposes for using power system dispatchers. They are necessary to control system properties like voltage, frequency, power flow, to observe the state of circuit breakers in substation and the planned interchange of power with the neighboring power systems. System signals and the actions against them are also in their supervisory control.

The controllers work correctly in all these occasions if they are provided with a complete snap-shot of the power system. The data is received from some computer consoles in different sub-stations. The specialists of the RTU were the pioneers to come to subordinate station level data acquisition like status of CB's, disconnectors, isolators and analog values such as MVAR, Hz, Amps etc. Russian Federation and China are now the most active exporters in this field.