| 摘要 |
In systems embodying the invention, a "downed" power line (23) is detected by sensing whether there is an open circuit along the power line (23) and producing an indication that an open circuit condition exists. In response to an indication that an open circuit exists, the system compares the nature of the voltage and/or current signals present on the power line (23) at the time an open circuit condition is indicated to exist, with a preprogrammed stored condition which includes typical signals to be expected when a "break" occurs along a power line (23). When a downed power line (23) is detected, power is then removed from the affected line (23).
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