Research on rapid estimation method of surface electric field strength and corona discharge control technology of the preformed helical spacer

The preformed helical spacer can effectively increase the grip strength of the spacer clamp and prevent the broken strands of the conductor. It has been widely used in gobi, large span, large height difference and other occasions. However, due to its large surface curvature, compared with the common spacer, it is easier to develop corona discharge, and the resulting corona discharge problem is more prominent. The finite element analysis of the preformed helical spacers commonly used in engineering is carried out. The influence of the pitch, the pitch number, the diameter and the number of the preformed helical wire and the diameter, the height and the distance between two poles of the conductors on the surface electric field strength of the preformed helical spacer is studied. The fast estimation method of the surface electric field strength of the preformed helical spacer is proposed, and the parameter selection method for reducing the corona discharge of the preformed helical wire is obtained. Finally, a scheme for reducing the surface electric field strength of the preformed helical spacer by setting the anti-corona discharge device is given, so that the maximum surface electric field strength of the preformed helical spacer is reduced to less than the surface electric field strength of the conductor.