| 摘要 |
<p>OPEN NEUTRAL PROTECTION An artificial neutral voltage derived from the voltages on both energized lines of a three-wire, singlephase energy supply system is compared to the voltage on the neutral line. Comparator means energize interrupter means to cause the cessation of a current flow in the energized lines of the circuit in the event the neutral line voltage is more than a predetermined value above or below the artificially derived neutral voltage for protection in the event an open neutral line condition occurs even when loads are not attached to the energized power lines.</p> |
