中间窗孔供三相电缆穿过。

The middle hole is used for cable going through.

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本型零序电流互感器为全封闭式。二次绕组及铁芯均浇注在聚脂树脂内。中间窗孔供三相电缆穿过。

The zero sequence current transformer is full enclosed type. The secondary windings and iron core are insulated by epoxy resin. The middle hole is used for cable going through.

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为确定三相充气管道电缆的尺寸，本文提出利用最大场强的简化计算方法来取代繁复的数值计算。

Instead of the time consuming numerical computation, a simplified calculation of the maximum field strength is presented for the purpose of dimensioning the three-phase gas insulated cable.

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