Abstract:Turntoturn insulation breakdown is the final expression form of turntoturn insulation fault for the drytype aircore reactor

the partial discharge under over voltage is one of the main factors causing the turntoturn insulation damage. In order to study the rule of the partial discharge along with the development of the voltage for the drytype aircore reactor turntoturn insulation

the test platform was constructed in the partial discharge shielding room. This paper references the manufacture process of 35kV drytype aircore reactor turntoturn insulation

and make the turntoturn insulation partial discharge test model

then get the partial discharge signal with the digital partial discharge detector in the way of stepvoltage. From the results

the variation characteristics of the maximum discharge

average discharge

discharge repetition frequency

and the twodimensional phase resolved partial discharge pattern of Hqmax(φ)

Hqn(φ)

Hn(φ)

 discharge amplitude grayscale

discharge energy grayscale can be obtained under different stepvoltage tests of stepup duration.