DFW-35 European style cable branch box without switch
Short Description:
A cable branch box is a device used for tapping, branching, splicing, and converting circuits of cable lines, mostly used outdoors. This device has not been in use for a long time in China, and industry insiders and power system users have different understandings and perceptions of it,
Product details
product overview：
A cable branch box is a device used for tapping, branching, splicing, and converting circuits of cable lines, mostly used outdoors. This device has not been in use for a long time in China, and industry insiders and power system users have different understandings and perceptions of it, especially regarding European and American plug-in devices imported from abroad. The following is a brief introduction and discussion of the relevant technical elements of cable branch boxes for the reference of power design and operation departments. The types of cable branch boxes are divided into two categories according to their electrical composition: one type does not contain any switch equipment, and only has accessories for processing and connecting cable wall heads inside the box, with a relatively simple structure, small volume, and single function, which can be called ordinary branch boxes; the other type contains not only accessories of ordinary branch boxes, but also one or more switch equipment inside the box, with a complex structure, large volume, many connector components, difficult manufacturing technology, and high cost, which can be called advanced branch boxes.
Ordinary cable branch box:
There is no switch device in the ordinary branch box, and the incoming and outgoing lines are electrically connected together with the same potential, suitable for tap or branch wiring. Usually, the number of incoming lines plus the number of outgoing lines is called the branch number. For example, a three branch cable branch box has three equipotential connection points on each phase, which can be used as one in two out or two in one out. The TV branch box contains U, VW three-phase circuits with the same structure, arranged in sequence together.
Advanced cable branch box:
The advanced branch box contains switch devices, which can serve as both tap and branch devices for ordinary branch boxes, as well as control, convert, and change the operation mode of power supply circuits. The switch break roughly divides the cable circuit into the incoming and outgoing sides, and the potentials on both sides can be different. The switchgear itself has a large volume, so the external dimensions of the advanced branch box are relatively large, with a height of generally 1.4~1.8m and a depth of 0.9~1.0m. The length depends on the number of switchgear contained, mostly between 1.0m and 2.4m. The appearance of the box body is similar to that of an outdoor box type transformer, with several movable doors on the box shell. Some doors are designed for the operation of switchgear, while others are designed for the installation, construction, or maintenance of cable connection devices.
scope of application：
The modified product is widely used for node connections in 35kV cable systems and is the main electrical equipment for collecting and tapping cables after they exit the switchgear. The cable joints of the junction box adopt high-grade insulationRubber tightly wrapped insulation, without exposed live parts; Switches with switch distribution boxes are all SF6 insulated load switches. The DFW branch box is designed for outdoor maintenance and operation, which is safe and reliable. Its protection level reaches IP33, and the underground tap can withstand flooding. The modified product is widely used in urban industrial communities, residential commercial centers, mining areas, large enterprises such as steel, automobiles, petroleum, chemical, cement, and other occasions for power distribution networks. It is particularly suitable for urban power grid renovation projects, which can greatly save electrical equipment and cable investment and improve power supply reliability.
