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DFWOutdoor 0.4kV low voltage cable distribution box

DFW series 0.4kV low-voltage cable branch box is mainly used in public power grid. It can be easily selected by users in flexible schemes according to the distribution of distribution network and the requirements of users, and according to a variety of branching modes, box types and installation modes. It is a supporting product to replace overhead incoming line in the construction and transformation of national urban network. It is widely used in low-voltage transmission and distribution systems with three-phase AC 380 / 220V and rated current below 1250A, such as power transformation and distribution stations, industrial and mining enterprises, both sides of the street, Garden residential quarters, high-rise buildings, airports, construction and transformation projects, as a complete set of finalized equipment for distributing electric energy to other users or equipment with cables.
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Product overview

DFW series 0.4kV low-voltage cable branch box is mainly used in public power grid. It can be easily selected by users in flexible schemes according to the distribution of distribution network and the requirements of users, and according to a variety of branching modes, box types and installation modes. It is a supporting product to replace overhead incoming line in the construction and transformation of national urban network. It is widely used in low-voltage transmission and distribution systems with three-phase AC 380 / 220V and rated current below 1250A, such as power transformation and distribution stations, industrial and mining enterprises, both sides of the street, Garden residential quarters, high-rise buildings, airports, construction and transformation projects, as a complete set of finalized equipment for distributing electric energy to other users or equipment with cables.

 

Model meaning

DFW

0.4

 
LV cable branch box Rated voltage (kV) Incoming current (a) Outgoing current (a) Number of incoming lines Number of outgoing lines

 

Working conditions
◊ Altitude: ≤ 2000 m;
◊ High ambient temperature: + 45 ° C, low ambient temperature: - 25 ° C;
◊ Sunshine intensity: 0.1w/cm2 (wind speed: 0.5m / s), large daily temperature difference: 25K;
◊ Indoor relative humidity: daily average value < 95%, monthly average value < 90%;
◊ High wind speed: 35m / S (Note: wind speed refers to the average wind speed of LOMIN 10m above the ground);
◊ Load: 10mm icing and 17.5m/s wind speed at the same time;
◊ Earthquake resistance: ground horizontal acceleration 0.2g; The vertical acceleration o.lg acts simultaneously. Resonance, sinusoidal and beat wave test methods are adopted; 5 times of excitation, 5 waves each time, with an interval of 2S. The safety factor shall not be less than 1.67;
◊ Rated frequency of the system: 50Hz.

 

Technical parameter

Entry name Company Technical parameter
Rated voltage

kV

0.4

Rated current

A

630

Rated short-time withstand current

kA

20/3

Rated peak withstand current

kA

50

DC withstand voltage (15min)

kV

52

5min power frequency withstand voltage

kV

45

Lightning impulse withstand voltage

kV

105

partial discharge

PC/kV

<10/15

Loop resistance

​μΩ

≤4

Degree of protection  

IP44

Operating ambient temperature

°C

-50 〜+60

Applicable cable section

mm2

25-400

 

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