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An electric power consumer is an enterprise utilizing electric power.<br>Its operating characteristics vary during the hours of day, days and<br>nights, days of week and seasons.<br>All electric power consumers are divided into groups with common<br>load characteristics. To the first group belong municipal consumers<br>with a predominant lighting load: dwelling houses, hospitals, theatres,<br>street lighting systems, mines, etc.<br>To the second group belong industrial consumers with a predominant<br>power load (electric motors): industrial plants, mines, etc.<br>To the third group belongs transport, for example, electrified railways.<br>The fourth consists of agricultural consumers, for example, electrotractors.<br>The operating load conditions of each group are determined by the<br>load graph. The load graph shows the consumption of power during different<br>periods of day, month, and year. On the load graph the time of<br>the maximum loads and minimum loads is given.<br>Large industrial areas with cities are supplied from electric networks<br>fed by electric power plants. These plants are interconnected for operation<br>in parallel and located in different parts of the given area. They<br>may include some large thermal and hydroelectric power plants.<br>The sum total of the electric power plants, the networks that interconnect<br>them and the power utilizing devices of the consumers, is<br>называется системой питания. Все компоненты системы питания взаимосвязаны <br>общими процессами защиты, распределения и потребления <br>щ е как электрической и тепловой энергии. <br>В системе электропитания, все действующие paralleliy растения несут общую <br>нагрузку всех потребителей , поставляемых в данной системе. <br>Построение системы питания OFA имеет большое значение для национальной <br>экономики. Экономичное использование установок электростанций <br>и источников питания достигается за счет взаимосвязанной работы <br>ряда электростанций в общей системе распределения электроэнергии.
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