XGN-12(SF6) Type AC High-Voltage Sulfur Hexafluoride Ring Main Unit

The XGN‑12 (SF6) type AC high‑voltage sulfur hexafluoride ring‑main switchgear (hereinafter referred to as the ring main unit) is a new generation of high‑voltage electrical equipment that our factory has independently designed and developed by introducing advanced foreign technologies and in accordance with the requirements of domestic rural power‑grid modernization and urban grid renovation. Following rigorous type tests and extensive long‑term trial operation, all technical performance parameters have fully met the IEC 298 and GB 3906 standards.

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High- and Low-Voltage Switchgear Series

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Product Description

　　Overview

　　The XGN‑12(SF6) type AC high‑voltage sulfur hexafluoride ring‑main switchgear (hereinafter referred to as the ring‑main cabinet) is a new generation of high‑voltage electrical equipment independently designed and developed by our factory, incorporating advanced foreign technologies and tailored to meet the requirements of rural power‑grid modernization and urban grid renovation in China. Following rigorous type tests and extended trial‑operation evaluations, all technical performance parameters have fully complied with IEC 298 and GB 3906 standards. The ring‑main cabinet is equipped with either an FLN‑12(SF6) load switch or an FLN‑12(SF6) load switch–fuse combination unit. Because SF6 gas serves as both the arc‑extinguishing and insulating medium, compared with vacuum load switches that use vacuum for arc extinction, SF6 switches provide “soft” breaking, eliminating the need to install surge arresters or other components in the primary wiring scheme to protect against overvoltages. The cabinet body is fabricated from imported aluminum‑zinc coated steel sheets, precision‑machined on CNC equipment and assembled by riveting, achieving an ingress protection rating of IP4X and featuring reliable mechanical interlocks and anti‑misoperation safeguards. This product boasts highly distinctive advantages, including compact size, light weight, aesthetically pleasing appearance, simple operation, long service life, high performance parameters, zero environmental pollution, and minimal maintenance requirements.

　　Product Model and Its Meaning

　　Technical Performance Parameters

Name	Unit	Parameter
Rated voltage	KV	12
Rated frequency	Hertz	50
Rated current of the main busbar	A	630
Rated short-time withstand current of the main circuit and the grounding circuit	KA/S	Main circuit: 20/3 Grounding circuit: 20/2
Rated short-time withstand current of the main circuit and the grounding circuit	KA	50
Rated short-time withstand current of the main circuit and the grounding circuit	KA	50 (with fuse)
Number of full-capacity interruptions by the load switch	Next	100
Fuse interrupting current	KA	31.5, 40. 50
Mechanical life	Next	2000
1-minute power-frequency withstand voltage (peak value), phase-to-phase, phase-to-ground / isolation gap	KV	42/48
Lightning impulse withstand voltage (RMS), phase-to-phase, phase-to-ground / isolation gap	KV	75/85
1-minute power-frequency withstand voltage of the secondary circuit	KV	2
Protection rating		IP4X