The invention of electricity has changed our human lives and made human civilization a big step forward. With the continuous development and progress of technology, our understanding and application of electricity is more handy. Let us understand the 10KV distribution cabinets together. Classification and function introduction:
A ring network cabinet is a group of electrical equipment for transmission and distribution installed in metal or non-metal insulated cabinets or assembled into a spaced ring network power supply unit. Its core uses load switches and fuses. It has a simple structure, small size, Low price, can improve power supply parameters and performance, and power supply safety. It is widely used in distribution centers and box-type substations of load centers such as urban residential quarters, high-rise buildings, large public buildings, factories and enterprises.
Cabinet types are classified according to switchgear, including load switchgear, circuit breaker cabinet, and GIS. Ring network cabinet is a common name, originally refers to the load switch cabinet for ring network power supply, is now often used as a synonym for load switch cabinet, whether it is used for ring network power supply, such as some lines require Closed-loop operation (commonly known as hand-in-hand), or the possibility of load cut-off (switching the load on one line to another line) The distribution cabinet that realizes these functions is called the ring network cabinet. Therefore, the ring network cabinet is a switch device that can realize the power supply of the ring network. It is often used in the ring network power supply system. It is also called "outdoor box ring network cabinet" and "opener".
Load switchgear can be used for ring-grid power supply, medium-voltage boundary room distribution, and medium-voltage terminal substation power supply. The power supply departments in different regions have different specifications for transformers that allow the use of load switches and fuse protection, such as Beijing. It is required that the transformer capacity is not greater than 1000KVA, and Shenzhen may be 1600KVA. The load switch cabinet is simple in structure, low in cost, and small in volume. Most of them can be installed by the wall. Generally, they only have fuse protection and no relay protection. The load-carrying capacity of the main bus of the load switch cabinet is generally less than or equal to 630A, the rated breaking current of the load switch is generally less than or equal to 630A (a few reach 1700A), and the rated current (fuse) of the transformer cabinet (outlet cabinet) is generally not greater than 125A. The transfer current of the load switch Can reach 2800A. Partial load switchgear can be installed with special vacuum circuit breakers, SF6 circuit breakers or arc extinguishing methods such as compressed air. The short-circuit breaking capacity is close to or reaches the level of the switchgear.
The ring network cabinet is used to split and combine the load current, open and close the short-circuit current and the transformer no-load current, and the charging current at a certain distance from overhead lines and cable lines.