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高压软起动全称为高压软起动器Medium、High-voltage soft starter，分别有高压液阻软起动方式、磁饱和电抗器式（磁控）起动装置。
⒈结构 完整的HPMV系列的软起动器是一个标准的电机起动控制器，用来保护和控制中、高压交流电机。完整的HPMV包括：隔离开关、保险丝、主真空接触器、控制变压器、控制模块、可控硅模块、高压真空旁路接触器。软起动部分仅包括：控制模块、可控硅模块、高压真空旁路接触器。
A、隔离开关：在起动器的输入电源部分装有一个允许电机直接带负载起动的隔离开关。这个隔离开关具有负载短路时起动和带负载停机的过载能力。其大设计值是：5KV隔离开关使用V的起动器，7.2KV用于V起动器，而15KV用于10-14KV的软起动器。
当隔离开关合闸时无法把控制柜高压部件部分的门打开。隔离开关带有连锁装置，只有当隔离开关切断电源时才可以打开机柜的门。同样情况当机柜被打开时隔离开关也无法合闸。隔离开关上的机械连锁装置使中压电源被有效的连锁住，以保证操作。
在控制的中高压输入电源部分装有一个可视窗口，不用打开机柜门就可以观察离合开关的闸刀是处于分离或合闸状态。当隔离开关在分离状态时有一个分离的刀臂通过机械装置与地相连接（对于14KV是选项部分）。
B、电源保险丝：对于标准的控制器在每相输入电源中装有保险丝进行初级的电源限流。典型的6900V以下的保险丝是ANSI标准R型，而10-15KV的控制器是采用ANSI标准E型保险丝。保险丝的选择是根据电机的堵转电流和所对应的固态起动器的过载继电器。保险丝和过载保护是设计用来防止较低和中等级的故障。这可以防止过载电流超过继电器额定值，以对较高的超过继电器保护范围的故障进行有效的保护。
熔断器的支架上带有保险丝指示器（连线接到绝缘的离合器控制电路），当三相中有一相保险丝开路时会自动断开全部三相电源。
C、SCR电源器件：在每相中是用一对相同参数的SCR反相平行的安装在一组的。为了达到所有使用电网的峰值电压要求。对SCR进行串联，其串联数如①400A，电压3300V串联SCR对数2对， SCR总数12，②600A，电压6000V串联SCR对数6对， SCR总数36
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