NAREW – Medium voltage switchgear

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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.

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NAREW construction without withdrawal element

A –high voltage compartment;

B – secondary wiring compartment;

C – gas exhaust valve;

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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;

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Technical data

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 up to 25/3s
Rated peak withstand current up to 63
Withstand for internal arcing fault 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 ΓOCT;
**) 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%

 

 

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