MetaL clad SF6B Gas insulation ring main unit

Specifications Metal-clad SF6 Gas-insulation ring main unitt with good quality,quick delivery and full services

TW Metalclad switchgear Ring Main Unit completely enclose all the parts with electricity in the sealed SF6 main box, the whole switch device is not affected by the outer environment, realizes the character of complete insulation, complete sealed and maintenance free, is the first choice for the urban net renewal and power distribution renewal and the residence community.
The ring main unit has extensive function of distribution network, which is equipped with motor operated controller and DTU remote communication terminals and can realize the remote monitoring operation.

Features

Safety Reliability Steady

safety:three-location of load switch including switch off, switch on and earth realize inter-latch, the indication is clear for the switch position, labeled with power distribution indication function to make sure the safety.

Reliability:reliable decompression passage way, arc protection fault design, passed type test of internal combustion arc

Steady:programmed design, standardized process control, module combination make sure the steady quality.

All-insulated, whole-closed, maintenance-free
All the high voltage parts with electricity is completely enclosed in the SF6 box, the protection grade is IP67, The whole switch gear is not affected by the external environment to realize all-insulated, whole-closed and maintenance-free. Technical Parameters:

Item		Unit	Load switch      (C)		Composite apparatus    (F)		Circuit-breaker      (V)		Isolation, earth switch
Rated voltage		kV	12	24	12	24	12	24	12	24
Rated current		A	630	630	Notice1	Notice1	630	630	630	630
Power-freq Withstand v	P-P& P-Earth	kV	42	65	42	65	42	65	42	65
	fracture	kV	48	79	48	79	48	79	48	79
Lightening impul. W.V.	P-P& P-Earth	kV	75	125	75	125	75	125	75	125
	fracture	kV	85	145	85	145	85	145	85	145
Rated short-circuit break current		kA	---	---	on fuse current	on fuse current	20	20	--	---
Rated short-circuit closed current		kA	50	50	on fuse current	on fuse current	50	50	50	50
Rated short-time withstand current(4s)		kA	20	20	20	20	20	20	20	20
Rated peak withstand current		kA	50	50	50	50	50	50	50	50
Rated short-circuit break current break times		times	---	---	---	---	30	30	---	----
Transfer current		A	---	---	1750	1750	---	----	----	----
take-over current		A	---	---	3150	3150	----	----	----	----
Rated pressure(+20℃)		Mpa	0.04		0.04		0.04		0.04
SF6 yearly leakage rate		%	<0.05		<0.05		<0.05		<0.05
Mechanical life		times	5000		5000		10000		3000
Protection grade			IP67		IP67		IP67		IP67