Non-groundneutralsystem and arc-suppression-coil-groundneutralsystem are called non-direct groundneutralsystem that is widely used in power distribution system.
中性点不接地系统和中性点经消弧线圈接地系统统称为中性点不直接接地系统，广泛应用于铁路配电系统中。
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In resonant ground systems, both asymmetric fault of high-voltage side and asymmetry of load cause the asymmetry of system electrical source voltage. Then they change neutral displacement voltage.
The problem of the experimental object design for ground experiment system of neutral buoyancy was one of the key to achieving demonstration effectually of the development of spacecraft.