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The Tony Davies High Voltage Laboratory

Insulation for high voltage dc power transformer

High voltage DC power transmission technology has attracted considerable
attention and will play an important role in the UK future transmission
system. This project investigates the performance of the oil-paper
insulation system used in HVDC transformers under a variety of electric
stress conditions. It attempts to determine the effects of oil resistivity
and other insulation conditions parameters on the capability of the
insulation to withstand the electric stresses seen within HVDC transformers
particularly during polarity reversal or other changes in stress. The pulsed
electro acoustic (PEA) technique is used to measure the charge accumulation
in oil-paper insulation system under different stresses and oil conditions,
especially the polarity reversal. Oil conductivity will play an important
role in the polarity reversal test of HVDC transformers, therefore, it is
important to understand the characteristics of oil under dc conditions. The
project intends to measure oil conductivity over a range of electric fields
and temperatures. In addition, oil conductivity provides an important
diagnostic measure for the insulation of a transformer.

Type: Normal Research Project
Research Groups: Electrical Power Engineering, Electronics and Electrical Engineering
Themes: High Voltage Engineering, Space and surface charge, Liquid dielectrics
Dates: ? to ?


Principal Investigators

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