公开(公告)号：US09322866B2

公开(公告)日：2016-04-26

申请号：US13919745

申请日：2013-06-17

Applicant: ABB Research Ltd.

Inventor： Nilanga Abeywickrama ,  Tord Bengtsson

IPC: G01R31/02 ,  G01R31/06 ,  G01R29/20 ,  G01R35/02 ,  H02H7/04

CPC classification number: G01R31/027 ,  G01R29/20 ,  G01R31/06 ,  G01R35/02 ,  H02H7/04

Abstract: A transformer diagnosis apparatus and method which can advantageously be used for on-line diagnosis of a transformer, and by which transformer properties may be monitored and/or determined. The diagnosis method includes collecting, for at least two different transformer loads, measurements of a current being indicative of the transformer load, as well as measurements of at least one further transformer AC signal. The method further includes deriving, from the collected measurements, at least two values of a quantity which depends on a transformer property as well as on transformer load; and determining, from the derived values, a set of coefficient(s) of a relation for how the quantity is expected to vary with transformer load. The method further includes using the determined coefficient(s) in performing a diagnosis of the transformer.

Abstract translation: 可以有利地用于变压器的在线诊断以及可以监视和/或确定变压器特性的变压器诊断装置和方法。 所述诊断方法包括针对至少两个不同的变压器负载收集指示变压器负载的电流的测量以及至少一个另外的变压器AC信号的测量。 该方法还包括从收集的测量中导出取决于变压器特性以及变压器负载的量的至少两个值; 以及从导出的值确定关于如何预期数量随着变压器负载而变化的关系的一系列系数。 该方法还包括在执行变压器诊断时使用所确定的系数。