Does new energy storage require a ring main unit

What is a ring main unit (RMU)?

In an electrical power distribution system, a ring main unit (RMU) is a factory assembled, metal enclosed set of switchgear used at the load connection points of a ring-type distribution network.

Do ring main units and switchgear work together?

The harmony between ring main units (RMUs) and switchgear is critical for the optimal performance of electrical distribution systems. Ensuring that these pivotal components work efficiently together is a design preference and a necessity for reliable power distribution.

Are ring main units a good choice for a substation?

RMUs have high upfront cost. RMUs have relatively smaller lifespan as compared to other types of switchgears. These are mainly suitable for small substations and are not for large substations. Ring main units (RMUs) are used in medium voltage secondary distribution networks for isolation, protection, and control purposes.

What are the applications of ring main units?

Some of the common applications of ring main units are listed below − A Ring Main Unit (RMU) is a small switchgear device used in medium voltage power distribution networks to enhance their reliability. It is a device used for supplying load from an alternate source when the main supply network is out of service due to fault or maintenance reasons.

Are ring main units safe?

Ensuring the safety of electrical systems is paramount, particularly when it comes to sophisticated equipment like Ring Main Units (RMUs). The occurrence of an electric arc is a serious concern in electrical switchgear, including RMUs.

What is a ring main unit?

Ring main units can be characterized by their type of insulation: air, oil or gas. The switch used to isolate the transformer can be a fusible switch, or may be a circuit breaker using vacuum or gas-insulated interrupters. The unit may also include protective relays to operate the circuit breaker on a fault.