++++General
The HXGN15-12/24 type unitized air-insulated ring main unit features an SF₆ load switch as the main switch, and the entire cabinet is suitable for distribution automation systems. It is a compact, expandable metal-enclosed switchgear. With its simple structure, flexible operation, reliable interlocking, and easy installation, it provides satisfactory solutions for various application scenarios and user requirements. By incorporating sensor technology, advanced protection relays, cutting-edge technologies, and flexible assembly solutions, the HXGN15-12/24 type SF₆ ring main unit fully meets the continuously evolving market demands. It can be equipped with the self-manufactured FLS-12/24 type load switch, or, based on user requirements, with internationally renowned brand load switches (LBS) or vacuum circuit breakers (VCB). The main switch inside the ring main unit can be operated manually or electrically. When used in conjunction with Feeder Terminal Units (FTU) and Remote Terminal Units (RTU), it can meet the requirements of "Four Remote" functions (remote measurement, remote signaling, remote control, remote adjustment).
++++Service Environment
a) Air temperature: Maximum temperature: +40°C; Minimum temperature: -5°C.
b) Humidity: Monthly average humidity: 95%; Daily average humidity: 90%.
c) Altitude: Maximum installation altitude: 2000m.
d) No significant corrosive or flammable gases, vapors, or other pollutants in the surrounding air.
e) No frequent severe vibration.
++++All Functions
1. Incoming unit with disconnector (load switch), optional additional components available
2. Outgoing unit with fuse-switch protection, optional additional components available
3. Incoming/outgoing unit with circuit breaker protection, optional additional components available
4. Medium-voltage metering unit, optional additional components available
5. Enclosure (busbar panel) unit, optional additional components available
6. Others
1. Disconnector
Switch unit (375/500mm)
Switch unit (500mm)
Switch unit — with/without earthing switch, right or left outgoing (375mm)
Note: Additional components such as surge arresters and lower earthing switches are optional.
2. Fuse-Switch Protection
Fuse-disconnector combination unit (375/500mm)
Fuse-disconnector combination unit (625mm)
Fuse-disconnector combination unit — outgoing direction right or left (375mm)
Note: Additional components (e.g., surge arresters or zero-sequence current transformers) are optional.
3. Circuit Breaker Protection
Single isolation circuit breaker unit (750mm) Single isolation circuit breaker unit, outgoing side optional left or right (750mm)
Note: 1. High-voltage SF₆ circuit breakers are also available in various models, determined based on customer requirements (e.g., SF1/LNR/Rockwell, PF/AREVA, etc.); vacuum circuit breakers are also optional (e.g., VD4/S-12/24 or VSC-12/24). 2. Other additional components (e.g., zero-sequence current transformers) shall be determined separately after communication between our company and the customer.
4. Medium-Voltage Metering
Main power voltage transformer for neutral-point-grounded systems (375/500mm); current and/or voltage metering unit (750mm).
Note: Additional components (e.g., surge arresters or zero-sequence current transformers) are optional.
5. Enclosure (Busbar Panel)
Right/left outgoing connection unit (375mm) Incoming cable connection unit (375mm) Incoming cable connection unit (500mm)
Note: Other additional components are optional (e.g., disconnector cubicle, voltage transformer cubicle, etc.).
6. Other Auxiliary Modes
Disconnector unit (375/500mm) Medium-voltage/low-voltage transformer unit for auxiliary equipment (375mm) Busbar earthing compartment (375mm)
