Medium Voltage Switchgears
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WITHDRAWABLE UNITS OF MV SWITCHGEARS WITH VACUUM CIRCUIT BREAKERS - RETROFIT
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Medium Voltage Switchgears type WEGA
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Unified construction system type WEGA enables:
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Building of metal-enclosed switchgears of rated voltage 7,2; 12; 17,5; 24 and 36 kV provided for indoor installations |
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Building of cubicle switchgears or metal-clad switchgears with metal partitions - acc. to Norm PN-EN 62271-200:2007 and PN-EN 60298:2000, PN-EN 60694:2001. |
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Building of single-unit switchgears with fixed components or double-unit ones, where a main circuit-breaker is installed on withdrawable unit |
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Building of free-standing switchgears or wall switchgears. All activities connected with switchgear service and including power cable connection are carried out from front in wall switchgears |
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Building of switchgears with high protection degree against touch of live parts - standard protection degree is IP4X acc.to IEC 60529 |
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Building of metal-enclosed switchgears resistant to electric arc acc. to PN-EN 62271-200, which ensure high protection degree of people against electric arc effects |
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Building of switchgears, where changing over of a withdrawable unit from “work” position” to “test” position is carried out at closed door of a switchgear. Withdrawable units are equipped with very easy to service withdrawable mechanism including a system of interlocks, which eliminates switching mistakes. Changing over of the withdrawable unit can be done also remotely by means of an electric motor. |
WEGA DOUBLE-UNIT, METAL-CLAD SWITCHGEARS
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WEGA type double-unit metal-clad switchgear in air insulation consists of a fixed and withdrawable unit.
There
are following compartments in the switchgear:
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Bus
bars compartment, |
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Connection
compartment, |
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Auxiliary
circuits compartment, |
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Withdrawable unit compartment. |
The compartments have been arranged thanks to metal – clad design. Frame assembled construction is made of screwed perforated profiles and steel sheets. Applied reinforced door, shields and ventilation flaps (top or bottom) ensure full protection against electric arc and its effects (up to 1 s) acc. to PN-EN 62271-200.
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High
safety degree of service has been achieved thanks to following solutions:
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Changing
over the withdrawable unit from “work” position to
“test” position and inversely is carried out at closed door of
the withdrawable unit compartment, |
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Metal
partitions shield automatically live parts when the withdrawable unit is
moved to “test” position, |
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Mechanical
and electromechanical interlocking systems prevent from incorrect operations, |
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Protection
against electric arc is carried out acc. to the international Norm PN-EN 62271-200, |
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Separated compartment of auxiliary circuits prevents from access to high voltage circuits. |
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Switchgears WEGA have passed test on hard desert conditions of Saudi Arabia |
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Switchgears type WEGA comply with requirements confirmed with tests and certificates issued by Electrotechnical Institute in Warsaw, Poland.
Technical Data:
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TECHNICAL
DATA |
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Type |
WEGA 07 |
WEGA 12 |
WEGA 17 |
WEGA 24 |
WEGA 36 |
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Rated voltage [kV] |
7,2 |
12 |
17,5 |
24 |
36 |
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Rated frequency [Hz] |
50
or 60 |
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Surge withstand test voltage [kV] |
60 |
75 |
95 |
125 |
170 |
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Test voltage 1-min [kV] |
20 |
28 |
38 |
50 |
70 |
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Rated current of bus bars [A] |
up to 3150 |
up to 3150 |
up
to 2500 |
up
to 2500 |
up to 1250 |
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Rated current n-sec [kA/s] |
31,5
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31,5
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31,5 |
25 |
25 |
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Peak rated current [kA] |
up to 80 |
up to 80 |
up to 80 |
up to 63 |
up to 63 |
| Immunity on internal arc [kA] |
31,5
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31,5
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31,5 |
25 |
25 |
| Immunity class on internal arc |
AFLR |
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Housing protection degree |
IP41 |
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Arc fault protection [kA] |
31,5 |
31,5 |
31,5 |
25 |
25 |
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MAIN DIMENSIONS |
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| Width [mm] |
600÷1000 |
600÷1000 |
600÷1000 |
750÷1000 |
1200÷1600 |
| Depth [mm] |
1250÷1450 |
1250÷1450 |
1250÷1450 |
1450 |
1900÷2000 |
| Height [mm] | 2100÷2250 | 2100÷2250 | 2100÷2250 | 2250÷2350 | 2500÷2600 |
Medium Voltage Switchgears type D-20
Technical Data:
| Rated voltage | 24 kV |
| Insulation rated level Uimp |
28/75 kV (12kV) 38/95kV (17,5kV) 50/125kV (24kV) |
| Rated frequency | 50 Hz |
| Bus bars rated current | 1250 A |
| Rated current of distribution panels | 630 A and 1250 A |
| Rated current 1-sec | 16 kA |
| Peak rated current | 40 kA |
| Bus bars system | single |
| Protection degree | IP3X and IP4X |
Medium Voltage Switchgears type WRS
Technical Data:
| Rated voltage | 24 kV |
| Operating voltage | 17.5 or 24 kV |
| Bus bars rated current | 1250 A |
| Rated current of transformer bays and bus coupler | 1250 A |
| Rated current of outgoing feeder | 400 and 600 A |
| Rated current 1-sec of bus bars AP80x10 | 30 kA |
| Rated current 1-sec of bus bars AP40x10 | 16 kA |
| Short circuit resistance is determined with the apparatus applied | |
