变压器油作为换流变压器的主要绝缘材料，其电导率的大小直接影响到设备直流电场和直流极性反转电场绝缘设计。在高压直流电场下对国内UHV换流变压器用油典型样品的电导率进行对比研究。结果表明：油间隙为5～15 mm，电场强度为2~6 kV/mm时，变压器油的电导率与油间隙没有明显的相关性，只受电场强度的影响，随着电场强度的增加，油的电导率增大；90℃下的电导率比30℃下的电导率高1个数量级；当介质损耗因数相近时，烃组成中CA值越高，变压器油的电导率越大；当烃组成相近时，介质损耗因数越高，变压器油的电导率越大。
Transformer oil is a main insulating material for converter transformer, and its conductivity di-rectly affects the insulation design of DC electric field and DC polarity reversal electric field of the equipment. The conductivity of typical oils for UHV converter transformer is comparatively studied. The results show that when the oil gap is 5~15 mm, the electric field strength is 2~6 kV/mm, there is no obvious correlation between the conductivity of oil and the oil gap, and the conductivity of oil only depend on the electric field strength. With the increase of the electric field strength, the conductivity of oil increases. The conductivity of oil at 90℃ is an order of magnitude higher than the conductivity of oil at 30℃. When the dielectric dissipation factor of oil is similar, the higher the CA value in hydrocar-bon composition, the higher the conductivity of transformer oil is. When the hydrocarbon component is similar, the higher the dielectric dissipation factor, the higher the conductivity of transformer oil is.
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