HXGN15-12 is a mainstream box-type fixed-type ring main unit switchgear for 10kV (12kV) distribution networks. It is equipped with SF₆ load switches or vacuum load switches as the main switch, with the entire cabinet having air insulation. It features a compact structure, low cost, easy operation, and reliable interlock. It is widely used in ring network power supply and terminal distribution scenarios.
I. Application Scope
Rated Voltage: 12kV (compatible with 10kV system)
Rated Frequency: 50Hz
Rated Current: 630A (mainstream)
Applicable Systems: Ring network power supply, radial power supply, single busbar system
Typical Applications: Urban distribution networks, community distribution rooms, box-type substations, industrial and mining enterprises, high-rise buildings, public facilities, rural power grid renovation
II. Main Technical Parameters (General Type)
Rated Voltage: 12kV
Rated Current: 630A
Rated Short-Term Withstand Current: 20kA/3s
Rated Dynamic Stability Current: 50kA (peak)
1min Power Frequency Withstand Voltage: Phase-to-phase / Relative Ground 42kV, Breaker 48kV
Lightning Impact Withstand Voltage: Phase-to-phase / Relative Ground 75kV, Breaker 85kV
Protection Grade: IP2X (door open), IP3X (door closed)
Mechanical Life: Load Switch ≥ 2000 times, Ground Switch ≥ 2000 times
Dimensions (Width × Depth × Height): 375/500/750 × 1000 × 1600/1850mm
III. Structural Characteristics
1. Box-type fixed, modular units
The cabinet body is made of aluminized zinc sheet with a fully assembled structure, without weld points, high strength, and good corrosion resistance. It adopts a modular design, which can be freely combined into incoming line, outgoing line, ring network, PT, metering, and other functional cabinets.
2. Separation of compartments
From top to bottom, it is divided into: instrument room, busbar room, switch room, fuse room, and cable room. Each compartment is independently separated, ensuring high safety and no interference during maintenance.
3. Main Switch Configuration
HXGN15-12(F): Equipped with FLN36-12D SF₆ load switch (three positions: isolation / load / grounding)
HXGN15-12(F·R): Equipped with SF₆ load switch - fuse combination electrical apparatus, used for transformer protection
Optional vacuum load switch, vacuum circuit breaker options
4. Complete "Five Prevention" Interlocks
Mechanical interlocks are mandatory between the load switch, grounding switch, and cabinet door to achieve:
Prevent incorrect switching of the switch
Prevent pulling open the isolating switch while there is load
Prevent connecting the grounding switch while live
Prevent energizing while connected to grounding
Prevent entering the live bay
5. Convenient Operation
The load switch is equipped with a spring mechanism, supporting manual/electric operation; the grounding switch is operated manually, with light operation force and high reliability.
IV. Performance Advantages
1. Compact and Economical
The cabinet width is only 375–750mm, occupying less space and having lower cost, suitable for distribution rooms and box-type substations with limited space.
2. Strong Environmental Adaptability
Air insulation, simple structure, suitable for conventional indoor environments, can be used at an altitude of ≤ 1000m and a temperature range of -5℃ to +40℃.
3. Maintenance-free, Long Service Life
SF₆ switches have no oxidation or accumulation of dirt, requiring no maintenance for many years of normal operation; mechanical life ≥ 2000 times.
4. Flexible Expansion
The modular structure can be combined into multiple cabinets to quickly form ring networks, dual power supplies, and terminal distribution systems.
V. Typical Configuration
Main Switch: FLN36-12D SF₆ load switch / Vacuum load switch
Protection: Load switch + fuse (F·R type), or equipped with microcomputer protection
Grounding Switch: JN15 series
Secondary: Instruments, live display, CT/PT, lightning arresters
Operation: Manual / Electric spring mechanism
VI. Summary of Applicable Scenarios HXGN15-12 is an economical main equipment for 10kV ring network power supply. With the core advantages of "compact, reliable and low cost", it is the preferred solution for terminal power distribution in urban power grids, residential areas, box-type transformers, industrial and mining enterprises, etc.