All live parts are placed into gas-insulated steel container. The container is filled with SF6 gas, which provides mutual insulation of current path elements, as well as insulation to the earth level potential. The arc quenching takes place in vacuum interrupters built both in circuit breaker and load break switches. SF6 gas is not used as arc-quenching medium, so the gas replacement has been eliminated. This feature provides complete environmental acceptability of this product.
Power transformer protection is enabled by vacuum circuit breaker, which is controlled by protective electronic relay. Besides the obligatory manual drive, compact modules series VDAP can be equipped with motor drive and set of releases for remote control of each device. There is possibility of complete automatization of distributive transformer substations, regarding various specific requirements for remote control and monitoring. This series of compact switchgear is suitable for distributive network nodal points, where remote control and monitoring is required.
BASIC TECHNICAL SPECIFICATIONS
|Rated power frequency withstand voltage 50Hz/1min.||kV||28||50|
|Rated lightning impulse voltage 1,2/50µs||kV||75||125|
|Rated busbar current||A||630||630|
|Rated circuit breaker current||A||630||630|
|Rated current of three-positional load break switch||A||630||630|
|Rated making/breaking capacity, modules with circuit breaker||kA||50/20||40/16|
|Switch-off time (short circuit)||ms||45||45|
|Rated making/breaking capacity for three-positional lbs||kA||50/0,63||40/0,63|
|Rated short time withstand current, 1 s||kA||20||16|