Ring main unit and solid insulation

The ring main unit is a kind of ring network power supply switch cabinet, can be implemented by the factory according to the requirements of a main wiring will be a few (single loop) switchgear assembled into a cupboard or multiple switch components are integrated to have multiple loop side cabinet, this combination or integration of the supply of complete sets of metal enclosed switchgear equipment in our country is mainly used for 10 kv secondary distribution system, in a foreign country for up to and including 36 kv ring network power supply system, reason often referred to as the ring main unit.

Solid insulation technology mainly refers to that the live part of the main circuit of the medium voltage switchgear is covered and enclosed by solid materials, or high electric field strength is transferred to the inside of the solid insulation material, so that the solid material bears a higher potential and reduces the air The field strength. The solid insulation ring network cabinet uses solid insulation materials as the main insulation medium, supplemented by a vacuum interrupter, to seal all the high-voltage live parts of the main circuit, and the outer surface is covered with a semi-conductive or conductive grounding layer to eliminate the influence of the external environment. Make the switch cabinet small in size and compact in structure. As the air, moisture, dust, and hot and cold air sources are isolated, it can effectively reduce the number of equipment maintenance, reduce operating costs, and extend the service life of the switch cabinet.