66kV low-voltage shunt reactor is of hollow reactor surrounded by a 360-degree strong magnetic field. The heating of foundation and grounding connection components in low-voltage reactor caused by theconstruction has a serious damage to the basic life and is unfavorable for the safe and stable operation of low-voltage reactor. Therefore

in this paper

a kind of detection technology based on ground penetrating radar（GPR）is proposed to reflect the actual situation of the hidden defects in the form of images with purpose ofaccurate location of the object and keeping the detection personnel analyze the reasons of the defects with-out relying on the design drawings. The detection technology is applied to the analysis low-voltage reactorheating defects in a Xinjiang 750kV substation

which provides a strong basis for the elimination of defects

and has achieved good results.