Релейная защита электродвигателей напряжением выше 1 кВ by В.И.Корогодский, С.Л.Кужеков, Л.Б.Паперно.

By В.И.Корогодский, С.Л.Кужеков, Л.Б.Паперно.

Аннотация издательства: Рассмотрены основные вопросы, связанные с выполнением релейной защиты электродвигателей напряжением выше 1 кВ, основные виды повреждений н анормальных режимов, принципы построения защит и их конкретная реализация на релейно-контактной и полупроводниковой аппаратуре в СССР и за рубежом. Приведены сведения о построении и методах исследований комплексных защит электродвигателей. Для инженерно-технического персонала, занимающегося исследованием, проектированием и эксплуатацией защит электродвигателей напряжением выше 1 кВ.

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The main draw back is that the mist cannot be fed directly into the fuel cell unless the atomization mist is very fine. Consequently energy has to be supplied to evaporate the water externally. Otherwise the water injection could have been done directly into the fuel cell which in turn would have lowered the need for cooling as well. 7 where it is also shown that at full load the amount of waste heat released from the fuel cell matches the amount of energy needed for evaporization of the water droplets.

1 Anode Side The main concern, when designing the anode side, is that it has to provide a safe way of supplying hydrogen for the fuel cell. As mentioned previously the humidity of the membrane is of major importance for the ion conductivity. Some fuel cell systems are supplied with water on both the anode side as well as to the cathode side. If top performance is desired this will be a good idea but on the other hand it adds significantly to the complexity of the system, and so it has been decided to test the fuel cell without humidification on the anode side.

5 [L/min]. A Grundfos Magna type pump has been used for this purpose. The pump flow can be controlled with an external 0-10 [Volt] signal, by which the degree of cooling can be managed. As explained in the previous section the heat exchanger is partly used for cooling the stack partly for supplying the energy for the humidification process. The radiator (pos. 19) has to remove the last part of the heat from the system. It has not been the subject of optimization and more likely it has been oversized.

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