The main developments of OAO All Russian Research and Design Institute of Relay Manufacture with a Pilot Factory in the field of high voltage electric drives and semiconductor converters designed and fabricated at the institute are considered. The key products are different types of thyristor devices for a soft startup based on thyristor frequency converters and thyristor devices for the automated actuation of a reserve in the power industry.Keywords: thyristor device for soft startup, high voltage motor, high voltage frequency converter, variable frequency electric drive.

The implementation of power saving equipment and optimization of the process are major trends in current technological development; they are espe cially important for the public utilities sector where they not only help solve economical problems, but also facilitate in dealing with socially important matters.Water supply pump stations can be operated using a variety of technical solutions.The easiest way to replace pumps is not the actual solution, since it will not ensure the sufficiently opti mum operation of the pump station if water consump tion differs greatly throughout the year or there is an increase in water needs due to industrial growth and the extension of city networks.Step control is cost efficient, but does not always ensure the fast operation required to realize the best performance, whereas provisional modes between the control steps require orificing, which makes the work of the pump station less energy efficient (Fig. 1).A large number of articles have been published that show that the best way to control the performance of the pump station is to vary the rotation frequency of the blade wheel [1-3].In general, the power consumption of the pump (kW) will be calculated as [1] (1)where Q is the pumping rate in m 3 /s; H is the pumping head in m; η p is the efficiency factor; η em is the effi ciency factor of the electric motor; η fr.conv. is the effi ciency factor of the frequency converter; and the basic P 9.81QH η p η em η fr.conv. , = parameters of the operation mode controlled by vary ing the rotation frequency of the blade wheel are [1] (2)where Q, H, and N are the pump rate, head, and power consumption, respectively; n is the rotation frequency of the blade wheel; and the indices determine different operation modes.According to (2), the pumping rate directly depends on the rotation rate of the blade wheel. For example, if the rotation rate of the pump motor Abstract-The construction of a combined system of pump station control based on a high voltage fre quency regulated drive and high voltage soft start system is described. It is shown that, using special algo rithms in control systems allows one to implement a very efficient and reliable technological complex with high performance capabilities at minimal cost.Keywords: variable frequency drive, high voltage frequency converter, high voltage soft starter, pump station, power saving. 100 80 60 40 20 0 2 0 4 0 6 0 8 0 1 0 0 Mains power consumption, % of P nom Pumping rate, % of Q nom Fig. 1. Dependence of power consumed from expenditure for different control modes. (⎯) orificing control; ( ) varia tions in rotation rate of blade wheel.

The structural scheme of multilevel transistor frequency converter with high voltage cells for the smooth start and controlling rate of asynchronous and synchronous motors of up to 5000 kW power. The application of the main components of frequency current controlling system is described. The frequency converter is made with integrated high voltage rectifier inverter cells and its phase includes two cells con nected in series at a power voltage of 6 kV and, for a power voltage of 10 kV, there are four cells.

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