提供了一般低压配电网主电源侧短路电流计算的公式。

A formula for short current calculation in low voltage power grid distribution was put forward.

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内置后配电池，保证无外接电源时，时间可常运转。

Without external power source, Internal battery can ensure the time displays normally.

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内置后配电池，保证无外接电源时，时间可常运转。

Without external power source, Internal battery can ensure the time displays normally.

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