Shunt reactors are basically composed of an active part, frame structure and tank. The active part mainly consists of the gaped core limb, winding block, yokes, return limbs and clamping structure (tie rods, traverses). Once assembled, the different parts need to be clamped and locked between the upper and bottom yokes using tie rods, to ensure that the whole assembly is tight enough to withstand the transport accelerations and safely operate in the high voltage power grid.
The former design was cost intensive due to the needed expensive high-tensile-steel for traverses and tie rods. In addition, the traverses increased the height of the reactor’s active part by approximately 30 centimeters.