Current transformer polarity DC detection method of extra-high voltage converter transformer

The invention relates to a current transformer polarity DC detection method of an extra-high voltage converter transformer. The method is characterized by comprising the following steps of firstly, forming a short circuit on a network side of the extra-high voltage converter transformer, respectively mounting pointer type microampere ammeters on the secondary sides of four sleeve current transformers of the extra-high voltage converter transformer, then applying DC pulse to a valve side of the extra-high voltage converter transformer, and judging the polarity of secondary windings of the sleeve current transformers according to the deflection directions of the foregoing pointer type microampere ammeters. It has been proved through trial that when the current transformer polarity DC detection method of the extra-high voltage converter transformer provided by the invention is used on site, the deflection directions and amplitudes of the foregoing pointer type microampere ammeters are very obvious, so that the p