而保护意味着使用保持在与高阻抗电路相同电位的附加的低阻抗导体来阻止可能的干扰电压或电流。
Guarding implies the use of an added low impedance conductor, maintained at the same potential as the high impedance circuit, which will intercept any interfering voltage or current.
经过带载实验运行，中点电位始终保持在允许范围内，实现了动态平衡。
After experiments with a load, neutral point potential is always maintained within the allowable range, to achieve a dynamic balance.
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