Its main types are magnesium silicate composite insulation material, silicon magnesium aluminum composite insulation materials and rare earth composite thermal insulation material.
它的材料主要种类有硅酸镁复合保温材料、硅镁铝复合保温材料和稀土复合保温材料。
2
The operating value of earth leakage protection can be changed with the mains voltage, but the operating value of cables insulation resistance is held the line.
该设计可以根据电网电压的波动调整动作值，从而保证电缆绝缘电阻的动作值不变；
3
Under several metres of earth, noise is minimal and insulation is excellent.