SF6 Filled Ring Main Units

Specifications Switches can be freely assembled in a completely sealed tank filled with SF6 gas, The degree of protection for unit is IP67.

SF6 Filled Ring Main Units   Product Introduction   Ring Main Units switches can be freely assembled in a completely sealed tank filled with SF6 gas, which could be both manual and motor operation. FTU is operational. Up to 4 to 7 switches can be assembled.   With the increasing power consumption and the continuous reconstructing of city and countrys power network, the further needs for related equipments for power distribution networks will be increasing gradually. The products designed by SOJO can meet all requirements of mid-voltage distribution networks for varied customers to different ring main modes, combination modes, protection modes, operating conditions, safety protection, transportation and installation requirements.   By the combination of accumulated production experiences, imported advanced international technologies and the assistant of computing simulation, the new developed SF6 filled mid-voltage switchgear-XGW ring main units with standard modular units and flexible combinations are, by one hand, met with requirements of network nodes and terminal users; and by the other hand; the second substations requirements for compact switchgears and flexible operation can also be fulfilled.   XGW-630/12 is the main modular structure of ring main switchgears. All live parts and switching mechanism are sealed into SF6 filled enclosure. This kind of switchgears is not affected by external environmental conditions, the reliability and safety standard can be guaranteed, therefore, the product is maintenance-free. One sealed container can be equipped with at most 6 sets of switching units. When there are more than 6 sets of units, the product can be extended by sealed and insulated extensible busbars. Modular design can fulfill various standardized and non-standardized connection schemes in power distribution network.   XGW-630/12 provides 4 standard modules; customers are able to select combined modules freely based on actual situation. The product can either be comprised as ring main unit or as transformer feeder switch.    Technical Parameters

Name			Unit	Parameters
				Type-B Switch		Type-C Switch	Type-F Switch
Rated Voltage			KV	12
Rated Frequency			Hz	50
Rated Bushbar Current			A	630
Rated Current			A	630		630	*
Rated Short Circuit Breaking Current			KA	20		20	*
Rated transferring current			A				1500
Rated Short-time Withstand current		Load Breaker 4S	KA	20
		Loadbreak Switch  3S
		Earth Switch 2S
Rated Withstand Current		Main Closed Loop	kA	50
		Earth Switch
Rated Short-Circuit Closing Current			kA	50
1 min Power Frequency Withstand Voltage	Phase to ground, Phase to Phase		kV	42
				42
	Vacuum breaking point
				49
	Isolated Breaking point
Lighting Impulse Withstand Voltage	Phase to ground, Phase to Phase		kV	75
	Vacuum breaking point			75
	Isolated Breaking point			85
Mechanical Life	Isolated Breaking point		Times	>1000	>2000
	Earth Switch		Times	>2000
SF6 Rated Gas Pressure			MPa	0.03
SF6 Rated Water Content (V/V)			PPM	≤500
SF6 Annual Leak Rate				≤1%

   Product Features Stainless enclosure; Completely insulated with filled SF6 gas; Maintenance-free; High capacity; Long life; Visible disconnection point; Reliable interlock, safely operation. Standards XGW-630/12meets following standards: IEC: 60694, 60298, 60265,60129,60240,60056 GB: 11022-99,3906-91,1985-89,16926-97,3804-90,3309-89 Working Environment: Temperature: -25 ~40   Ralative humidity: daily average no more than 95%, monthly average no less than 90% Altitude: no more than 2000M;Earthquake Intensity: 8