Morris Line Engineering has developed a fully type tested RDB Major Pattern Rotating Disconnector rated up to 145kV, 2000A, 40kA/3secs, using Silicone Rubber or Porcelain Insulators. The basic design has been developed using the concept of the 72.5kV rotating range, which has proved very reliable and successful.
Our design team has used the concept of a locking/guide arrangement on all the contacts that acts when the disconnector is in the closed position preventing contact separation and contact pressure variation when using silicone insulators under fault conditions. All the contact spring pressure are accurately achieved by using adjustable contact fingers which are set up once the forces of any bus bar or conductors are connected to the connector pads, this concept maintains the correct pressure as was originally type tested. The disconnector may be either manually operated or motorised, with earth blades available for fitment on either or both sides of the disconnector.
RDB Double Break Disconnectors Major Pattern 145kV (Cat. No. RDBM/15)