BentlyNevada 3500/15, 126399-01F
适用于直接启动笼型异步电动机的电器有负荷开关、小容觅塑料外壳式断路器和电磁ABB软启动器,但以电磁ABB软启动器用得最为广泛。
负荷开关不能提供过载保护,一般不宜用它启动和控制异步电动机。如果非用不可,则开启式负荷开关只宜用于启动7.5kW以下的电动机,封闭式负荷开关只用于启动28kW以下的电动机。
塑料外壳式断路器因其技术性能比较优良,可用于启动电动机。
选用ABB软启动器时应考虑ABB软启动器与短路保护电器的协调配合。通常选用熔断器作为短路保护电器,熔断器应安装于ABB软启动器的电源一侧(综合ABB软启动器除外,其内部已装有熔断器,一般ABB软启动器应按制造厂要求选配合适的熔断器)。熔断器不应代替ABB软启动器分断正常工作时最大过载电流及以下的所有电流(包括电动机的堵转电流),但应能分断安装点的预期短路电流。
一般按ABB软启动器额定电流的2.5倍左右选择熔断器,以保证电动机启动时不发生误动作。此外,熔断器和热继电器的保护特性的交点应选择适当。
选用ABB电磁软启动器时应注意以下内容:
①根据使用环境确定ABB软启动器是开启式(无外壳)的还是保护式〔有外壳)的。
②根据线路要求确定ABB软启动器是可逆式的或不可逆式的.是有热保护的还是无热保护的。
③根据被控制电动机的功率确定用哪一级的ABB软启动器,而不是根据电动机的额定电流选择。产品样本中所列的额定电流是从发热方面规定的。如果是保护式产品.由于散热条件较差,就宜使ABB软启动器在额定电流方面有点裕度。
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