Ring Main Unit for Distribution Network

Ring main units use SF6 gas or environmentally friendly gases as the primary insulating medium, integrating the vacuum interrupter, main conductive circuit, and insulation support into one unit.

Functional units are connected through fully insulated solid busbars and are widely used in industrial and civil cable ring networks and distribution network terminal projects for receiving and distributing electrical energy. They are suitable for urban residential areas, small substations, switch stations, cable branch boxes, box-type substations, industrial and mining enterprises, shopping malls, airports, subways, wind power, hospitals, stadiums, railways, and tunnels.

Fully insulated, fully sealed, fully shielded

Suitable for harsh environments such as high altitude, high temperature, humid heat, and severe cold.

Compact structure, safe and reliable, maintenance-free

Enhances ease of use.

Flexible expansion

Supports combinations of 1 to 4 circuit units, allowing for universal box or complete single box structures according to customer needs.

Technical Parameters

Item			Standard Parameter Values
			12 kV		24 kV
			Load Switch Cabinet	Load Switch Cabinet	Load Switch Cabinet	Circuit Breaker Cabinet
Rated Voltage			12 kV		24 kV
Rated Insulation Level	1 min Power Frequency with Stand Voltage	P to P, P to E	42 kV		50 kV
		Break	48 kV		60 kV
	Lightning Impulse with Stand Voltage	P to P, P to E	75 kV		95 kV
		Break	85 kV		110 kV
	Auxiliary Circuit 1 Min Power Frequency with Stand Voltage		2 kV		2 kV
Rated Frequency			50 / 60 Hz		50 / 60 Hz
Rated Current			630 A		630 A
Gas Insulated Medium			SF6 / N2		SF6
Rated Short Time Withstand Current (4s)			20 kA	20 / 25 kA	20 kA	20 / 25 kA
Rated Peak with Stand Current			50 kA	50 / 63 kA	50 kA	50 / 63 kA
Rated Short Circuit Duration			4s		4s
Rated Short Circuit Breaking Current (for VCB)			/	20 / 25 kA	/	20 / 25 kA
Rated Short Citcuit Making Current (peak) (for VCB)			/	50 / 63 kA	/	50 / 63 kA
IP Class	Shell		IP 4X		IP 4X
	Air Box		IP 67		IP 67

Outline Drawing

Secondary Instrument Box
Circuit Breaker Mechanis
Isolation Grounding Swich Mechanism
Cable Room Door
Current Transformer
Incoming and Outgoing Cables
Zero Sequence Transformer
Side Extension Bushing
Circuit Breaker Switch
Copper Busbar Connection Inside The Gas Box
Incoming and Outgong Bushing

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