The reduction of accuracy of low power consumption instrument transformer（LPT）after the miniaturization design has limited its application in the primary and secondary fusion for distribution equipment.For the purpose of finding a way to improve the accuracy of LPT and promote the development of primary and secondary fusion for distribution equipment

the study on the LPT’s error and its influencing factors is carried out in this paper.The test on the influence of such factors as temperature cycle

vibration

EMI and wiring on the errors of low-power consumption instrument transformers is systematically conducted.The variance calculation method is used to analyze the error variation characteristics of the instrument transformer.Under the condition of insufficient samples

the hypothesis testing method is used to verify the analysis of vibration test result by the paper.The electric field models are set up to analyze the influence mechanism of proximity effect and wiring on the error of LPT.The study result reveals that the error of all kinds of LPT under test is within the limit range

showing that the accuracy of LPT fully meets the requirements of the primary and secondary fusion design.With consideration of accuracy factor and in the context of great and frequent variation of temperature

the resistance divider voltage instrument transformer shall be given priority in the primary and secondary design proposal.The influence of vibration on the error of the instrument transformer is very small

even less than the influence of temperature.The low power consumption instrument transformer

in the context of vibration

still has stable and dependable accuracy.In case of magnetic field interference

selection of iron core with wide linear range and unsaturation can still keep LPCT instrument transformer having higher accuracy.While

in case of wiring

selecting optimal HV lead length to keeping the included angle between the HV lead and the horizontal direction at 90°can

in case of wiring

minimize the influence of the HV lead on the error of the instrument transformer.Properly increasing the installation distance of the instrument transformer and adding shielding on the instrument transformer are the effective measures to reduce electric field interference and improve accuracy of the instrument transformer.