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1 Overview:
The EY.DFW□-12 outdoor high-voltage cable distribution box is an outdoor high-voltage electrical equipment with rated voltage of 12kV and rated current of 630A and below. It is widely used in the connection and branch of power cables.
 2. Applicable places:
This product is widely used in power systems of 10kV and below for cable connection and branching. The connection method is simple, flexible, convenient, safe and reliable. The cabinet is made of stainless steel and is durable. The live part is fully insulated and fully sealed. If the flood-proof and touchable cable head is adopted, it can also withstand flooding and intrusion, which greatly improves the reliability of power supply. The product is widely used in urban industrial communities, residential quarters, commercial centers, mining areas, airports, railways, wind power stations, opening and closing houses and large enterprises such as steel, petroleum, chemical, cement and other distribution networks. It is especially suitable for urban road network transformation projects, which can greatly save investment in electrical equipment and cables. Improve power supply reliability.
3. Normal use conditions:

3.1 Altitude 2000 m
 3.2 Maximum ambient temperature + 55 °C
 3.3 Minimum ambient temperature -40 °C
 3.4 Sunshine intensity 0.1W/cm? (wind speed: 0.5m/s)
3.5 Maximum daily temperature difference 25K
 3.6 Indoor relative humidity: Daily average ≤95%, monthly average ≤90%
 3.7 Maximum wind speed 35m/s (Note: Wind speed refers to the average wind speed of 10min from the ground 10m height)
3.8 Loads 10mm ice and 17.5m/s wind speed at the same time
3.9 Earthquake resistance The horizontal acceleration is 0.2g; the vertical acceleration is 0.1g. The safety factor is ≥ 1.67.
3.10 System rated frequency: 50Hz
 3.11 Installation location Outdoor
4, structural performance characteristics
The cable distribution box is an outdoor high-voltage switchgear, so it must be equipped with functions such as rainproof, rustproof, ventilation, heat, electric shock, anti-theft and easy installation and maintenance. The outdoor cable distribution box produced by our company has a louver (internal welding Φ1 steel mesh) air inlet at the lower part of the box; the air outlet is provided at the top of the box, hidden under the top sill, and the top cover is air interlayer Double-layer structure; the base of the box is provided with detachable partitions, cable inlet and outlet and ventilation holes to prevent small animals from entering. This forms a convective air from the bottom up, so that the box has good heat insulation, ventilation and rainproof effect. Spray eye-catching “high pressure hazard” warning text and warning symbols on the outer surface. The door lock adopts bolts and padlocks to protect against electric shock and theft. A live display device for accessing the cable is installed in a prominent position in the box. In order to facilitate the maintenance and repair of the line, improve the flexibility of the operation mode, and reduce the line power-off time, the load switch can be connected with the relevant cable connector accessory to become a cable branch box with a switch. The switch can directly break the load current and improve the reliability of the power supply. Fully insulated, fully sealed, full working condition. Under the condition that the main network is not affected, the regional power failure maintenance is realized. It can replace part of the ring network cabinet and reduce the project cost. Configure maintenance-free SF6 load switch. It has all the technical features of the common cable distribution box.
5, SF6 three station load switch
There are 3 states: closing, opening, and grounding.
Use SF6 as the arc extinguishing and insulating medium.
The SF6 air pressure in the load switch is 0.04MPa (20°C)
The mechanical life of the load switch is long, 30 years of life-long sealing and maintenance-free
The three-station load switch can only be placed in any of the three positions of closing, opening and grounding to prevent misoperation. When the load switch is in the grounded state, it can enter the cable room.
6. Test standards and requirements
Tested according to the latest version of the IEC standard and the national standard (GB). In the test, the following additional requirements and additional IEC instructions must be followed and implemented. The specified items and methods are tested, and the test results meet the requirements of the corresponding provisions of this technical specification.
6.1 type test
6.1.1 Insulation test: a) Lightning impulse withstand voltage test b) Power frequency withstand voltage test
6.1.2 Temperature rise test The temperature rise test shall be carried out in accordance with GB/T 11022 standard.
6.1.3 Main loop resistance measurement
6.1.4 Dynamic and thermal stability test of main circuit and grounding circuit
6.1.5 Protection level inspection
6.1.6 Internal arcing test
6.1.7 Earthquake test
6.2 Factory test
6.2.1 Test according to the items specified in GB3804 and GB16926, and provide factory ex-factory standards.
6.2.2 Each accessory is factory tested in the factory. The test items are: a) structural inspection b) mechanical operation and mechanical characteristics c) power frequency withstand voltage test of main circuit d) withstand voltage test of control circuit and auxiliary circuit e) Main loop resistance measurement
6.3 Field test According to the relevant items and standards of the “Power Equipment Handover and Preventive Test Procedures” of Jiangsu Electric Power Company.
7. Transportation, installation and operation and maintenance
7.1 mark
7.1.1 Each product shipped from the factory shall have a nameplate with the following: a) manufacturer's name and trademark; b) product name and model number; c) rated voltage; d) rated current; e) rated frequency; Rated short-time withstand current; g) rated lightning impulse withstand voltage; h) rated short-circuit closing current; i) total weight (kg); j) manufacturing year; k) factory number.
7.2 Packaging and Transportation 7.2.1 The packaging conforms to the factory standard to ensure that the product will not be damaged, cracked, deformed, lost or dampened during transportation; the insulation and insulators are specially protected from cracking and scratching;
 Conductive contact surface, coated with anti-freeze conductive paste. All transportation measures should be verified. Do not invert during transportation and must not be subjected to strong vibrations and collisions. 7.2.2 The products are packaged in moisture-proof and shock-proof products. The boxes are marked with “significant care”, “not allowed to be inverted” and “anti-rain and moisture proof”. The following text or symbol mark is on the package: Product model, name and quantity; company name and address; name and address of the receiving unit; box size (length * width * height); weight (net weight, gross weight) kg . 7.2.3 Each product certificate (including factory inspection data) and installation and operation manual are delivered in the box. 7.2.4 The product should be inspected and tested as required in the instruction manual before use.
7.3 Installation All instructions provided include the following: 7.3.1 Special tools, working procedures and methods for unpacking and lifting; 7.3.2 Check the test items and requirements after the switch is installed.
7.4 Operation and Maintenance 7.4.1 The manufacturer shall provide instructions and precautions for the maintenance work. 7.4.2 The operating mechanism shall give the following contents: a. Maintenance, overhaul cycle and criteria for temporary maintenance; b. Maintenance and overhaul procedures and precautions. 7.4.3 Electrical connections shall give the following contents: a. Under what circumstances the electrical connection shall be protected against electrical corrosion; b. Which electrical connections shall be inspected; c. The technical standard for electrical connection inspection. 7.4.4 Technical documents should be submitted to the user together with the product: 1) packing list; 2) product manual; 3) product installation and use manual 4) spare parts list; 5) equipment list.