Consequences of operating a ring main unit without energy storage

How do Ring Main Units work?

Ring Main Units (RMUs) are widely used in metro and smart cities to provide reliable power supply. They work by forming a loop with feeders and are fed at one or several points to create a Ring Main Network. It's essential for Electrical Engineers to understand the working of Ring Main Networks and Ring Main Units.

What is Ring Main Unit distribution?

Ring Main Unit distribution is a type of distribution network that is more costly than others but is commonly used in urban cities due to its high reliability. RMUs are available in different voltage ratings, ranging from 11KV to 33KV.

What is a ring main unit (RMU)?

In modern electrical distribution systems, ensuring reliability, safety, and compact design is crucial. One device that has become an integral part of medium-voltage networks is the Ring Main Unit (RMU). This blog provides a technical overview of RMUs, including their structure, functionality, advantages, and applications.

How does a ring main distribution system handle a fault?

In a ring main distribution system, if a fault occurs in any branch of sub transmission circuit, that branch is removed from service and power continues from the remaining loop without discontinuity in the supply. Every consumer has redundant supply in Ring main distribution system.

Why should you choose a smart ring main unit?

Smart Ring Main Units (RMUs) offer several advantages. They allow remote operation with IEDs, making SCADA implementation easy. Additionally, they occupy less space as they are Gas Insulated Switchgear, have quick installation and commissioning times, and require minimal maintenance.

What if a distribution substation ring is open?

In a ring main distribution system, the ring is open at one of the distribution substations with one switch in Normally Open condition. Each feeder in the ring main normally runs as a radial feeder. In case of a fault, it is likely to occur on both sides of the open point.