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

摘要： 使用梯度收缩法开展了变压器局部放电源的超声定位工作。梯度收缩法结合了牛顿法和共轭梯度法的优点，应用目标函数的二阶导数，收敛速度快，具有牛顿法的“二次收敛”特性，并具有较高的精确度。实验结果表明，梯度收缩法能有效解决变压器局部放电点定位问题。

关键词: 梯度收缩, 牛顿法, 共轭梯度法, 局部放电, 超声定位