Abstract
Traditional leakage protection schemes are difficult to detect and isolate the leakage fault accurately. A reliable and flexible solution for leakage fault protection with selective has being looked for. According to the shortages of protection systems used in ungrounded low-voltage distribution networks currently, a new design of selective leakage protection is put forward. The action criteria of the design which are based on additional DC power supply and direction of zero-sequence power are proven to be very effective to leakage fault, both theoretically and practically. The selective leakage protection which should have no time difference and more accurate action for underground low-voltage distribution networks can be realized. In this paper, we use STM32F103R8 processor of ARM Cortex-M3 family as the core control chip and μC/OS - II embedded operating system. This paper focuses on the hardware and software design.
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