矿物油变压器注换两种酯类绝缘油的研究

Study on Retrofill Mineral Insulating Oil Transformer with Two Kinds of Ester Insulating Oils

本文主要研究了传统矿物油变压器注换酯类绝缘油包括天然酯及单酯绝缘油的可行性问题,首先研究了两种酯类绝缘油与矿物油混合后的常规电气、理化特性,在此基础上,分别使用两种酯类绝缘油对两台10 kV矿物油变压器进行注换,并测试注换前后变压器的整体特性。结果表明:使用单酯绝缘油注换矿物油变压器后,变压器的温升有所降低,对地电容提高且绝缘电阻下降;使用天然酯绝缘油注换矿物油变压器后,变压器的温升有所提高,对地电容提高且绝缘电阻下降。使用两类酯类绝缘油注换老旧矿物油变压器均具备可行性,且使用单酯绝缘油进行注换可提高变压器的散热能力,但应注意注换单酯绝缘油后变压器绝缘电阻的降低。

This paper mainly studied the feasibility of retrofilling traditional mineral oil transformer with ester insulating oil,including natural ester and mono-ester insulating oil.At first,two kinds of ester insulating oil were mixed with mineral oil,respectively,and their electrical and physicochemical characteristics were studied.On this basis,two 10 kV mineral oil transformers were retrofilled with two kinds of ester insulating oil,respectively,and the overall characteristics of the transformers before and after retrofilling were tested.The results show that after using the mono-ester insulating oil to retrofill the mineral oil transformer,the temperature rise of the transformer decreases,the capacitance to ground increases,and the insulation resistance decreases.After using the ester insulating oil to retrofill the mineral oil transformer,the temperature rise of the transformer increases,the capacitance to ground increases,and the insulation resistance decreases.It is feasible to retrofill mineral oil transformer with two kings of ester insulating oils,and using the mono-ester insulating oil to retrofill the old mineral oil transformer can improve its heat dissipation capacity.However,it should pay attention to the reduction of transformer insulation resistance after retrofilling the mono-ester insulating oil.