关键词: 梯度收缩, 牛顿法, 共轭梯度法, 局部放电, 超声定位

Abstract: Gradient shrink method is employed to perform partial discharge location in transformer.Gradient shrink method combines the advantages of Newton method and Conjugate gradient method.It employs second-order derivatives of objective function，so the convergence rate of the method is outstanding，and it has rather good accuracy and quadratic termination property.The testing results show that gradient method can effectively solve partial discharge location problem in transformer.

Key words: gradient shrink, Newton method, conjugate gradient method, partial discharge, ultrasonic location