Abstract
A residual current protector based on high performance micro-controller MSP430 is introduced. The micro-controller MSP430F149 is used as the main controller in the device, which can detect the real-time residual current value. And the residual current operating value can be switched automatically according to the present condition of the power system. When the protection is occurred, the residual current protective device has the inverse time lag function, ideal time delay and the automatic reclosing function. So the residual current protective device can be used at all kinds of complicated rural grid and climatic condition, and the safety and the reliability of the power supply can be ensured.
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