JW8A/9B-550 grounding switch is for high voltage line under te condition of no load flow or on the maintenance of high voltage bus, circuit breakers and other electrical equipment and reliable electrical grounding with high-voltage lines, and can effectively cut off electromagnetic induction and static electric induction current.

Main Features

1. Plug-in structure, reliable grounding

2. The balancing spring system to balance the breaking-closing heavy torque of the cutter bar and can effectively reduce the operating force

3. Balance spring sealing device, can effectively waterproof and dustproof

Service environment

service environment stable 1

Items	Specifications			Unit	Value
1	The surrounding air temperature		The Highest temperature	℃	＋40
			The Lowest temperature		-40
			Maximum daily temperature difference	K	25
2	Altitude			m	≤1000
3	Solar radiation indensity			w/m2	1000
4	pollution class				III grade、IV grade
5	Icing-thickness			mm	10
6	Wind speed				m/s	34
7	Humidity	Daily average relative humidity			%	≤95
		Monthly average relative humidity				≤90
8	seismic intensity					9 degree
9	The common mode voltage amplitude which is induced by the opening and closing operation of the main circuit from the auxiliary and control circuit.				kV	≤1.6
10	The installation site should be free of severe vibration and flammable, explosive materials and chemical corrosion.

Product catagories and rated parameters

Product catagories and rated parameters stable 2

Item	Specifications			Unit		Value
I	Structure and type of earthing switch
1	Structural style				JW8A-550 Straight lun plug-in		JW8B-550 Straight lun plug-in
	Operating mechanism style				CJ11 electrically operated mechanism
2	Operating mode				Three-phase electric linkage
	Electric or mannual				Electric and mannual
	Motor voltage			V	AC 380 or DC 220
	Control voltage			V	AC 380V or AC 220V or DC 220V or DC 110V
3	Backup auxiliary contact			Yes	8
II	Rated parameters
1	Rated voltage			kV	550
2	Rated frequency			Hz	50
3	Resistance of the main circuit			μΩ	260
4	1min power frequency withstand voltage			kV	740
	Rated lightning impulse withstand voltage peak（1.2/50ms）			kV	1675
	The rated operating impulse withstand voltage peak（250/2500ms）			kV	1300
5	Rated short-time withstand current			kA	63
6	rated duration of short-circuit			s	3
7	Rated peak withstand current			kA	160
8	Radio interference level			μV	≤500
9	The switching induced current capacity of the earthing switch	Electromagnetic induction	Reactive current	A	80		400
			Induced voltage	kV	2		35
			Breaking times	time	10
		Electrostatic induction	Capacity current	A	2		50
			Induced voltage	kV	8		50
			Breaking times	time	10
10	Opening time			s	12±2
11	Closing time			s	12±2
12	Break-brake average speed			m/s	0.33
13	Closing average speed			m/s	0.33
14	mechanical life			次time	≥2000
15	Assist and control circuit short-time power frequency withstand voltage			kV	2
16	Wiring terminal static mechanical load	Longitudinal		N	4000
		Horizontal			2000
		Vertical			1500
		Safety factor			Static state2.75, Dynamic state1.7
17	After closing the earthing switch, the minimum air insulation distance should not less than			mm	3900
18	supporting insulator	Creepage distance		mm	Ⅲgrade：13750、Ⅳgrade：17050
		Electric arc distance (dry)			≥3800
		S/P			≥0.9
		Bending resistance		kN	12

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