The 35kV cable branch box is one of the key auxiliary equipment within a 35kV substation. Below is a detailed introduction to the 35kV cable branch box:
I. Main Functions
The 35kV cable branch box can distribute high-voltage incoming cables or low-voltage outgoing power cables, facilitating operation, maintenance, and management of the lines. Additionally, it can connect power cables to transformer substations, load-disconnect switches, negative fuse combination switch cabinets, ring main supply units, etc., serving as splicing, branching, relay, or conversion functions, greatly enhancing the convenience of cable networking.
II. Key Features
Outdoor Type (also available in indoor type), fully enclosed structure: "Five Protection" safety, maintenance-free, offering reliable personal safety assurance.
Simplified System: High-voltage, live-line, environmentally-friendly outdoor cable junction boxes can simplify urban cable network systems and save on investments.
Highly adaptable to environments: outdoor type, dustproof, moisture-proof, flood-resistant, and corrosion-resistant, with flexible combinations from single-line input/output to multi-line, catering to various wiring requirements.
Compact Structure: Small in size, compact design, and aesthetically pleasing appearance, easy to install, convenient for mode conversion, and flexible protection setting. Equipped with a live voltage indicator,短路indicator available, and surge protector optional.
Small footprint: Compact, low-profile design with aesthetic appearance, harmonizes with surrounding environment; flexible wiring options, and extremely easy installation and operation.
III. Technical Specifications
Generally, the technical specifications of a 35kV cable branch box include but are not limited to:
Rated Voltage: 35kV (also available in 40.5kV specification)
Rated Current: Common specifications include 200A, 400A, 630A, 1000A, 1250A
Rated Frequency: 50Hz
Number of cable branching loops: 2~6
Cable Connector Type: Live-touchable, fully sealed step-tightening silicone rubber plug
Rated dynamic stability current (peak): 50 kA
Rated lightning impulse withstand voltage: 185kV
Power Frequency Withstand Voltage (1 min): 95 kV
IV. Terms of Use
To ensure the normal operation of the 35kV cable branch box, the usual operating conditions are specified as follows:
Altitude not exceeding 2,000m
Operating temperature range: -30℃ to +40℃, with daily average relative humidity not exceeding 95% and monthly average not exceeding 90%.
No frequent violent vibrations, wind speed not exceeding certain limits (e.g., 34m/s)
Surroundings free of corrosive or flammable gases, steam, and other obvious pollutants
V. Buying Recommendations
When selecting a 35kV cable branch box, it is recommended that users consider the following factors:
Define Requirements: Determine the required technical parameters such as rated voltage, rated current, and cable branching circuit numbers based on the actual application scenario and requirements.
Select Brand: Prioritize well-known brands and manufacturers with good reputations to ensure product quality and after-sales service.
Examine Manufacturing Process: Inspect the product's manufacturing process and detail handling, such as the plug's sealing, the enclosure's protection grade, etc.
Compare Prices: Select products with the best value for money by reasonably comparing prices among different brands and models, while ensuring quality and meeting requirements.
In summary, the 35kV cable branch box plays a vital role in the power system. For more information or professional advice, please consult an electrical engineer or relevant technical personnel.
