Switching installation with arc protection and arc protection method

Abstract

A switchgear (5) comprising a gas-filled enclosure (30), an input conductor (33), an actuator (50, 159, 550) and a short-circuit device (43, 51, 500). The actuator (50) is arranged to actuate the short circuit means (43, 51) when a first arc (62) occurs in the enclosure (30). The short circuit device (500) when actuated creates a short circuit between the input conductor (33) and the housing (30) or a discrete ground point (560) through the solid insulation (42). The actuator (50) may be arranged to act on an increase in pressure in the housing (30) when the first arc (62) occurs. The gas can be air or SF6. The short circuit device (43, 51) may, when actuated, produce a short circuit through a section (543) of solid cable insulation (42) isolating the input conductor (33) from the housing (30).

Description

technical field [0001] The invention relates to a switching installation comprising a gas-filled enclosure. The invention also relates to a method for such a switchgear. Background technique [0002] Due to its good insulating properties, medium and high voltage switchgear - which is used for voltages in excess of 1000V - widely uses SF 6 Insulated, allowing to obtain a compact device. However, there is such a strong desire that considering the SF 6 ——especially its decomposition products HF, SOF 2 , SO2 - for adverse environmental consequences, do not use SF 6 as an insulating medium. Therefore, air is increasingly used as an insulating medium. As a result of the poor insulation quality of air by a factor of 2-4, the size of the equipment needs to be increased to prevent sparks or arcs between multiple voltage-carrying components. This in turn leads to an increase in the amount of energy released in the event of an accidental arc, since the amount of energy is propor...

AI Technical Summary

Problems solved by technology

[0005] The known switchgear has the disadvantage that despite the cessation of the arc, hot gases are released through the exhaust panel and thus may involve a safety risk for operators in the vicinity of the switchgear

Although the arcs in such systems are shorter and therefore lower in energy, arcs can still cause damage to switchgear, which can lead to hot gases - such as SF 6 Undesired release of decomposition products - of particular importance, resulting in a safety risk to operators

Also, since SF 6 For greenhouse gases, for environmental reasons, SF 6 release is not desired

Images