直流输电系统单极大地回路运行方式导致电网部分变压器振动加剧，噪声增大，影响了设备安全。
The monopolar ground circuit operation mode of DC transmission system gives rise to excessive vibration and noise of some transformers in the power grid, which impacts the safety of equipment.
HVDC系统以大地回路方式单极运行时，其大地回路直流会给交流变压器带来一些问题，例如，变压器噪音明显增大，过热现象，甚至引起变压器损坏。
When a HVDC system operates in ground-return mode, some problems such as noise rising significantly, overheating etc. occur in AC transformers, or even some transformers would be damaged.
HVDC系统以大地回路方式单极运行时，其大地回路直流会给交流变压器带来一些问题，例如，变压器噪音明显增大，过热现象，甚至引起变压器损坏。
When a HVDC system operates in ground-return mode, some problems such as noise rising significantly, overheating etc. occur in AC transformers, or even some transformers would be damaged.
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