Electric-Field Sensing In High-Voltage Bushings

Important results from the project

The purpose is to investigate the possibility of developing a sensor for measuring electric field strength inside high-voltage bushings to transformers. A number of methods and types of fiber optics for measuring electric field have been tested. Candidates have since been used in the manufacture of prototypes that have been routinely tested. During the project, interviews with customers, internal and external, were also conducted to build a business case. An important conclusion here is to integrate the concept with transformers and to be able to measure transients.

Expected long term effects

The result is expected to be a basis for further development in the form of an assessment of the concept´s applicability and a planning of necessary activities to be able to implement the technology industrially. In the longer term, this project part of Hitachi ABB Power Grid´s strategy towards increased digitalization of the electricity grid. Increased sensor use is expected to contribute to optimization of power outlets and better maintenance planning.

Approach and implementation

The work is divided into three work packages. In part, the feasibility is tested technically, partly in the laboratory at Rise, partly in the manufacture at ABB Hitachi Power Grids. This part lasts throughout the project, risk of delays in testing at Hitachi ABB due to visit and travel restrictions due to COVID-19. Then the project also includes an analysis of the market potential that is mainly done by ABB Hitachi Power Grids. The last work package is a planning of future development based on the knowledge provided by the feasibility study.