Cable branch box

NegotiableUpdate on 05/14

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

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Overview

Cable branch box

Product Details

1、 Product Overview

As the name suggests, high and low voltage distribution cabinets are distribution equipment used in power supply systems for energy distribution, control, metering, and cable connection. Generally, power supply bureaus and substations use high voltage switchgear,Then, the low-voltage side of the transformer is stepped down and led out to the low-voltage distribution cabinet. The low-voltage distribution cabinet is connected to various power distribution panels, control boxes, and switch boxes. Inside, some switches, circuit breakers, fusesA power distribution device that integrates protective devices such as buttons, indicator lights, instruments, and wires to meet the design functional requirements. Commonly known as high and low voltage switchgear or complete sets of high and low voltage electrical equipment.

2、 Model and meaning

3、 Normal usage conditions

The altitude shall not exceed 1000m.
Environmental temperature: -45 ℃ -+45 ℃.
Relative humidity: The daily average is not greater than 95%, and the monthly average is not greater than 90%.
Installation location: A place without fire, explosion hazards, conductive dust, corrosive chemical gases, and severe vibrations. If the above conditions are exceeded, users can negotiate with our company.

Serial Number	name	parameter
1	rated voltage	12kV
2	Rated current	630A
3	Power frequency withstand voltage (phase to ground)	42kV/min
4	lightning impulse voltage	75kV
5	Rated breaking current	630A
6	Rated short-circuit opening and closing current (peak value)	50kA
7	Rated short-time withstand current	25A/4S
8	Rated peak withstand current	50kA
9	Rated breaking capacitor current	45A
10	Rated breaking inductance current	16A
11	Number of full load disconnections	＞100
12	Number of mechanical operations for opening and closing the switch	2000

4、 Typical wiring scheme

5、 Outline schematic diagram (mm)

6、 Common cable connectors

Made of imported high-quality insulating rubber with fully automatic injection, both the inner and outer layers are semiconductor shielding layers, the inner layer is used to balance the internal electric field, and the outer shielding layer is grounded to protect the zero potential on the surface of the cable head. The inner layer at the lower end of the stress cone is in close contact with the semiconductor layer of the cable, and the outer semiconductor layer is in close contact with the outer semiconductor layer of the cable head, and is grounded through the grounding hole of the cable head. This not only solves the problem of electric field concentration at the cutting point of the outer shielding layer of the cable, but also keeps the outer shielding layer of the cable at zero potential, ensuring personal safety. The touchable cable front connector is directly installed on the equipment casing, and can be connected to the touchable cable rear connector to form multiple outgoing lines. It can also be connected to lightning arresters to provide overvoltage protection for the power grid.

7、 Electrical connection profile diagram

Before installing the cable head, carefully read the installation manual (inside the accessory box);
When peeling and cutting cables, the labeling card for the cables in the accessory box should be used;
Before crimping the wire terminals, a stress cone should be installed first;
The installation of intermediate joints must be in place to ensure that the wiring terminals are firmly fixed, otherwise serious consequences may occur due to poor contact;
Only the end of the insulation plug is equipped with gaskets and nuts, and gaskets and nuts are prohibited from being installed in other parts.

8、 Electrical connection section diagram and dimensions (mm)

9、 Technical requirements

The inner side of the brick wall is sealed with 1:3 cement sand and treated with waterproofing;
Concrete operation is used for beam penetration;
After the production of basic channel steel, anti-corrosion treatment must be carried out;
After the installation of the branch box is completed, cement should be used to seal around the base;
Waterproof measures must be taken at the entrance of the manhole;
Grounding electrodes should be pre embedded in the foundation, and the grounding resistance should meet the requirements of the power department.

10、 Main Circuit Scheme Diagram

11、 Ordering Notice

If the product model and user have special requirements, a drawing can be provided once;
Standard cross-sections for incoming and outgoing cables as well as branch cables;
The number of selected lightning arresters and short-circuit fault indicators;

The material and color of the casing.