而信号远离电源电压后，再维持放大器的共模抑制是不必要的，需要的却是不为瞬间过电压所毁坏的条件。
It is not necessary that AMPLIFIERs maintain common-mode rejection for signals beyond the supply voltages: what is required is that they do not self-destruct for momentary overvoltage conditions.
本文主要针对雷电和操作过电压所引起瞬间过电压对电子设备系统的损坏，来探讨加装电源防雷器时采用四模块和3 + 1模块时性能比较和分析。
Aiming at mangling of electron equipment due to transient over voltage from thunder and operation between 4 and 3 + 1 source defend thunder equipments is discussed.
减小接地故障点的残流有利于接地电弧的瞬间熄灭及降低间歇性电弧接地过电压。
The reduction of the residual current of the ground-fault point is beneficial to the extinction of the grounding arc and to the reduction of the intermittent arc grounding over voltage.
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