介绍了固体静态切换开关（SSTS）的工作原理和控制策略。
The principle and control strategy of solid static transfer switch(SSTS) are introduced in this paper.
分析了静态转换开关（STS）的无环流切换控制的工作原理。
The control theory for static transfer switch(STS) without circulation current is elaborated.
大功率静态旁路开关，过载时可自动转旁路供电，零切换时间；
High-power static bypass switch, overload automatically switch to bypass when the power supply, zero switching time;
切换采样转子一点接地保护，通过两个静态开关一开一合建立两组方程来求解接地电阻与位置。
Commonly, by opening one switch and closing the other, two group equations are set up to measure rotor earth-fault resistance in the rotor earth-fault protection with switch sampling principle.
切换采样转子一点接地保护，通过两个静态开关一开一合建立两组方程来求解接地电阻与位置。
Commonly, by opening one switch and closing the other, two group equations are set up to measure rotor earth-fault resistance in the rotor earth-fault protection with switch sampling principle.
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