RMU appears more important for underground cabled power distribution network in improving its devices and other aspects, with the rapid development of urbanization; ring main units (RMU), as the major device for protection and segment isolation to ground cabled distribution network, are widely used in urban power grids, due to its safe and reliable performance, compact and superior cost-effectiveness.
Main Feature:
- Rated current 630A and rated short-time withstand current 20kA for 3 seconds.
- Three-position disconnector/earthing switch downstream vacuum circuit breaker.
- Interlocking between vacuum circuit breaker & disconnector/earthing switch.
- Protection relay with ring core CTs on cable bushings.
- Rated current 630A and rated short-time withstand current 20kA for 3 seconds.
- Three-position switch fuse disconnector with upstream earthing switch mechanically linked with a downstream earthing switch.
- Motor operation for load break switch.
- SF6 pressure indicator
- Capacitive voltage indication system