公开(公告)号：US20230175954A1

公开(公告)日：2023-06-08

申请号：US18061929

申请日：2022-12-05

申请人： Qualitrol Company LLC

发明人： Sri Krishna Bukya ,  Emilio Morales Cruz ,  Anis Zribi ,  Andre Pelletreau ,  Colin Brown ,  Paul Donegan

IPC分类号： G01N21/31

CPC分类号： G01N21/31 ,  G01N2201/08 ,  G01N2201/0635

摘要： A method of directly measuring moisture content in an oil-filled transformer includes using an optical fiber that having a grating sensor, such as a Fiber Bragg grating, defined in the optical fiber. The various conductors (windings) in the transformer are insulated using an insulator such as paper and insulating oil is filled inside the transformer. Moisture in the transformer is absorbed by the paper that surrounds the windings. A moisture content at a specific location can be measured by placing the optical fiber with the grating sensor directly at the specific location to be measured. A physical parameter of the paper that absorbed moisture changes over time, causing a change in the grating sensor of the optical fiber which changes the spectral response of optical signals that are reflected by the grating sensor. The method provides an accurate method of measuring the moisture inside the transformer at the specific location.