Air insulated ring main unit, XGN15 series

Air insulated ring main unit is a compact metal-enclosed switchgear designed to supply and protection of electrical power in open ring or radial distribution system of 12/24kV with three phase AC rated frequency 50~60Hz. The ring main unit uses SF6 gas (sulphur hexafluoride) as the insulating gas, coupled with advanced protection relays and sensor technology, it suited to various network applications including distribution stations, substations, switching stations, as well as power systems in industrial enterprises, residential areas, airports, hospitals, railways, tunnels and high-rise buildings. We are capable of providing solutions tailored to users’ specific needs.

The ring main unit consists of busbar compartment, 3-position load break switch compartment (or circuit breaker compartment), cable compartment, operating mechanism, interlocking mechanism, low voltage control, etc. All compartments are segregated from each other by means of steel sheets to avoid faulty component from affecting adjacent compartments.

Standard IEC 62271-1: High-voltage switchgear and controlgear - Part 1: Common specifications IEC 62271-100: High-voltage switchgear and controlgear – Part 100: Alternating-current circuit-breakers IEC 62271-102: High-voltage switchgear and controlgear - Part 102: Alternating current disconnectors and earthing switches IEC 62271-105: High-voltage switchgear and controlgear – Part 105: Alternating current switch-fuse combinations for rated voltages above 1 kV up to and including 52 kV IEC 62271-200: High-voltage switchgear and controlgear - Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1kV and up to and including 52kV Features Busbar compartment is mounted on the top of enclosure to increase the electrical distribution capacity; 3-position load break switch has epoxy resin housing; Switch compartment can be configured with gas density meter or gas density unit with alarm contact; Cable compartment can be installed with earthing switch, surge arrester, current transformer, voltage transformer, in addition to using for cable connection; Cable compartment door has safety interlock and inspection window as standard; Bottom plate of cable compartment can be disassembled for easy installation and maintenance of cables; Low voltage compartment can be equipped with auxiliary contacts, trip coils, emergency tripping mechanism, padlocks, as well as secondary components such as metering instrument and protection relay; Technical Parameters

Item			Unit	Parameter
Rated voltage			kV	12	24
Rated frequency			H z	50/60	50/60
Rated current			A	630	630
Fuse-switch rated current				125	125
Rated short-time withstand current			kA	25	20
Rated short-circuit making current			kA	63	50
Rated peak withstand current				63	50
Rated closed-loop breaking current			A	630	630
Rated insulation voltage	Power frequency withstand voltage (1 min)		kV	42	65
	Rated lightening impulse withstand voltage (peak)			75	125
Degree of protection				IP3X
Mechanical Endurance			Times	5000	5000

Front vide side vide of VCB unit side vide of LBS unit

Width	VCB unit	750mm
	LBS unit	500/375mm
Depth	Cable bottom incoming & outgoing	940mm
Height		1885mm