Air insulated outdoor switchgear ORU is designed to receive and distribution in three-phase current of frequency 50 Hz and voltage 35, 110, 150, 220 kV earthed neutral systems electro supply
ORU are used for modular package transformer substation KTPB for rated voltages 35, 110, 150, 220 kV
Construction
Air insulated outdoor switchgears are produced from package portable blocks that consist of carrying metal frame with placed equipment, busbar and auxiliary circuit elements.
ORU busbar performed from aluminium pipe. Each block corresponds switchgear open cell and acts as attachment
ORU equipment is installed on pre-engineered and prepared area after foundation assembling
Auxiliary circuit cables are laid in overhead metal or in-ground concrete mold flumes
Energized conducting parts are secured by repair inventory fence for ORU 35, 110, 150, 220 block connection repair production safeguarding
Technical data of ORU 35 kV, PRU 110 kV, ORU 150 kV, ORU 220 kV
| Parameter
| Value for ORU 35 kV | Value for ORU 110 kV | Value for ORU 150 kV | Value for ORU220 kV |
| Rated voltage [kV] | 35 | 110 | 150 | 220 |
| Maximum operated voltage [kV] | 40,5 | 126 | 172 | 252 |
| Rated current, [А]: |
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| - main circuits | 630 | 630 | 630 | 630 |
| - collecting buses | 1000 | 1000, 2000 | 1000, 2000 | 1000, 2000 |
| Initial short-circuit current [кА] | 52 | 52 | 52 | 65, 81 |
| Short-time thermal current, 3s [кА] | 20 | 20 | 20 | 20, 31,5 |
| Earthing circuits rated voltage [V] |
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| - AC | 380/220 | 380/220 | 380/220 | 380/220 |
| - DC | 220 | 220 | 220 | 220 |
| - voltage transformers | 100 | 100 | 100 | 100 |