They produce semiconductors of special materials. Their electrical resistance should be among that of a conductor and a non-conductor. Variations of temperature or the part of dashes also change the electrical resistance.
The material contains admixtures if some different substances have been added to it. Semi-conductors are marked as thyristors of type-n and type-t due to the components of finished material.
They produce diodes and transistors combining these variants of semiconductors. It's obvious that these days the most popular material for semiconductor production is silicon.
Semi-conductor material is needed to produce diodes that are for putting the stream of electrical current only in one sense. In every single diode there is a part created of positive and negative elements (p- and n-) as well as of so-called barrier level (pn-transfer). Diodes create electrical schemes converting among direct and alternating current. As diodes make current flow just in a single direction only half of the series or cycle passes by. A connection of this kind is known as a rectifier.
LED (or light diodes) is one more variant of diodes. Such diodes are needed in case it's a task to produce light at small voltages and at the same time make no heat. These days specialists have LED light diodes as the light showing the standby mode of different electronic gadgets.
Moore's law led to the popularization of thyristors theory. The most significant side for manufacturinfg complex power semiconductor equipment at lower cost is now lithography. Concerning optical lithography, it now gives way to the popularization of alternate techniques as it has reached its physical limit. Now ultraviolet lithography and nano-imprint lithography are thought to be the best substitutes to optical one. X-ray lithography and electron beam lithography these days are also known to be of big potential.
Such an important device as current sensors was discovered in Russia. Sensors are used in many devices for lots of purposes. They may be applied in either business, manufacture or personal constructions. The shape and value of the voltage sensor can change according to the kind of device. And the sensors may be little (as in some light detectors) or complex (detectors that signal radiation changes).
It's anyway impossible for the current sensors to function alone. There are lots of ways for applying power system controllers. They are needed to maintain system components like voltage, frequency, power flow, to keep an eye on the state of circuit breakers in dependent station and the planned interchange of power with the neighboring power systems. System signals and the processes against them are also in their constant control.
The complete snap-shot of the whole power system must be supplied to the controllers from the displays on several PCs of different dependent stations. With the use of respective interfacing elements the state of CB's, fuses, isolators and analog values such as MVAR, MW, Hz, Amps etc. was found out in the RTU. The biggest success in export belongs to Russia and China.