Products » MV Equipment » RI6Q


Load break switch

Three positions SF6 insulated load break switch RI6Q for Minibloc-6

24-36 kV - 400÷630 A - 12,5÷25 kA 

Homologated Enel DY803

General characteristics
Manufacturing technology is about the use of SF6 gas as an insulating and breaking agent. Sulfur Hexafluoride, a non-toxic, nonflammable, inert gas, is widely known for its highly dielectric characteristics and its high
thermal conduction properties which allow a quick arc estinguishment.

The load break switch is designed with double switching rotating moving contact, guaranteeing the reliability of dielectric withstand with load break switch in open position.
Active parts are inside a metallic enclosure, made by stainless steel (sealed proof and life-time guaranteed according to CEI EN / IEC 62271-103 and 62271-1 standards) for which no fill-up is needed.

An over-pressure valve is placed in the lower part of the enclosure, guaranteeing the gas exit in case of any accidental pressure increase over 2,5 bar, with further safety status of the apparatus.
The inside capacity of the container is 70 litres with working pressure of 0,35 bar (or 135 Kpa as absolute value) and environmental temperature of 20°C.

Six outside/inside bushings are mounted on the metallic enclosure, which is filled with SF6 gas; they are used for power conductors connection.
Bushings are made of epoxy resin with wings (creepage distance > 350mm )and guaranteed of no partial discharges.

Switch Type SRI6Q

It is a kind of disconnecting switch with rated current 400-1250 A.

The RI6Q load break switch, out of basic accessories, may be also fitted with the following ones:

The load break switch RI6Q-SV type may be fitted with three MV fuses for protection of transformers in compliance with standard CEI EN 62271-105 (IEC 62271-105).

The choice of the fuse rated current must be done according to data, shown in the below mentioned table and considering the several circuit requirements (transformer off load connection current, transformer wind up faults, short circuit current on secondary terminals).