问题：
[单选题]运行中的变压器保护,当现场（）,重瓦斯保护应由“跳闸”位置改为“信号”位置运行.
A、进行注油和滤油时
B、变压器中性是不接地运行时
C、变压器轻瓦斯保护动作后
D、变压器中性是接地运行时
参考答案：
A
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