KONČAR - Medium Voltage Apparatus Inc. last update 10.01.2010.
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VDA Series


for indoor installation, compact non-extensible version

Vacuum compact cubicles (ring main units) series VDA are manufactured for rated voltages 12, (17,5) and 24 kV. The main purpose of VDA compact switchgear is energy distribution in transformer substations up to 2500 kVA, at voltage ratio 10(20)/0,4 kV. Compact switchgear series VDA is designed for indoor installation, at normal service conditions, in accordance with IEC 62271-200 and IEC 60694. Vacuum compact switchgear series VDA are highly reliable and available, as well as completely independent on environmental conditions. Overall dimensions of VDA compact switchgear are considerably reduced in comparison with classic air insulated cubicles equipped with three-positional load break switches and HRC fuses.

Basic versions of VDA switchgear consist of two, three and four conducting feeders with vacuum load break switches, and one transformer feeder with vacuum circuit breaker for power transformer protection, or two conducting and two transformer feeders. 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.

The traditional combination of load break switch and HRC fuses has been substituted with innovative sollution: three-positional vacuum load break switches and vacuum circuit breaker controlled by microprocessor-based overcurrent relay for power transformer protection. Besides the obligatory manual drive, ring main unit series VDA 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.


Nominal data Three-positional vacuum load break switchVacuum circuit breaker
Rated voltagekV1217,5241217,524
Rated power frequency withstand voltage 50Hz/1min.kV283850283850
Rated lightning impulse voltagekV75951257595125
Rated currentA630630630630630630
Rated breaking capacitykA0,630,630,63201616
Rated making capacitykA504040504040
Rated short time withstand current 1 sec.kA201616201616
Switch-off time (short circuit)ms---454545