NAREW – Medium voltage switchgear
Medium Voltage switchgear NAREW are designed for operation in 50/60 Hz AC power distribution networks and rated voltages up to 17,5 kV.
Switchgear NAREW are set up from either form cubicles of fixed mounted design or truck-mounted design, with equipment varying depending on the function, assigned to the panel in the switchgear.
Particular cubicles are made from metal plates covered by aluminum-zinc coating. Doors, enclosures and external covers are covered with powder varnish in RAL color according to the Customer’s needs. Two-unit panels have a separated busbar compartment.
NAREW construction without withdrawal element
A –high voltage compartment;
B – secondary wiring compartment;
C – gas exhaust valve;
NAREW construction with withdrawal element
A – bus-bar compartment;
B – withdrawal element and cable connection compartment;
C – secondary wiring compartment;
D – withdrawal element;
E – trolley;
F – gas exhaust valve;
TECHNINIAI DATA
NAREW 12
NAREW 17
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| Rated insulation voltage | kV | up to 12 | up to 17,5 | |
| Rated lightning impulse withstand voltage (1,2/50μs) | kV | 75/85 | 95/110 | |
| Rated power frequency withstand voltage | kV | 28/32 42/48 | 38/45 | |
| Rated frequency | Hz | 50 | ||
| Rated continuous current | A | 630-1250 | ||
| Rated short time withstand current | kА | up to 25/3s | ||
| Rated peak withstand current | kА | up to 63 | ||
| Withstand for internal arcing fault | kА | up to 25/1s | ||
| Degree of protection | IP 4X | |||
| IAC classification (class of resistance to internal arc) | AFLR | |||
| PM/PI classification (class of partitions) | PM | |||
| LSC classification (class of compartment accessibility) | LSC2A | |||
| Weight | kg | 350-950 | ||
| Bus-bar system | single | |||
| Standards | IEC 271-200:2007, IEC-60694:2004, ГОСТ 14693:1990 | |||
| Overall dimensions**) | Width | mm | 600-750 | |
| Depth | mm | 1000-1085 | ||
| Height | mm | 2000-2075 | ||
*) required according to GOST;
**) without external guards, covers, doors;
Environmental operating conditions
Switchgear NAREW with installed equipment are adapted for indoor operation under normal conditions, with the following environmental conditions:
Installation altitude above sea level | to 1000 m | |
Ambient temperature: | peak short-time | 313 K (+40°C) |
maximum daily average | 308 K (+35°C) | |
maximum yearly average | 293 K (+20°C) | |
minimum sustained | 268 K (-5°C) | |
Air relative humidity at 313 K (+40°C): | during the start up | max. 80% |
during standstill or operation | max. 95% | |