The end electrical field distribution under polarity reverse test voltage of valve winding in converter transformer is calculated. The results are analyzed.

计算了换流变压器阀侧绕组在极性反转试验电压下端部电场的分布情况，并对计算结果进行了分析。

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It offers a 48 VDC redundant power input design and is secured with a double protection mechanism; power Polarity Reverse and an Overload Current Resettable Fuse.

它提供了一个48伏直流冗余电源输入设计，配备了双重保护机制：电源极性反转和过载电流自恢复保险丝。

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If a cell does get fully drained, though, it can go into a state known as polarity reversal, in which the surrounding good cells drive the bad one in reverse.

如果电池没有完全耗尽，便会进入一种称为极性颠倒的状态。这种状态下，周围具有电量的电池会反过来推动电量很少的电池工作。

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Mountaineering Council of Scotland said incidents where compasses were affected by reverse polarity were increasing.

BBC: Reverse polarity a risk to climbers, mountain body warns

Ms Morning said a call from Mr Williams for experiences of reverse polarity had seen stories from outdoor enthusiasts come "flooding in".

BBC: Reverse polarity a risk to climbers, mountain body warns

No-one knows how the Sun's enormous magnetic fields are generated, or why they reverse polarity from positive to negative every 11 years.

BBC: Sun has strange 'spin cycle'