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Earthing Switch MJW-126

Description

MJW-126 is a earthing switch for an open installation. The Earthing switch is intended for safe grounding of equipment during repair and maintenance, is a high-voltage device for outdoor installation of a three-phase AC network with a rated voltage of 110-220 kV and a frequency of 50 Hz, used to ground current conductors disconnected from power supplies. The earthing switch complies with the requirements of IEC 62271-102.

Rated voltage, kV: 110, 220

Maximum working voltage, kV: 126, 252

MJW-126, 252 is used to safely ground electrical equipment during repairs and maintenance.

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Parameters

Operating Conditions of MJW-126 and MJW-252

Altitude: up to 2000 m.
Ambient temperature: from -45°C to + 45°C.
Humidity: the average value of relative humidity during the day is not more than 95%; the average value of relative humidity during the month is not more than 90%.
Seismic resistance up to 8 points.
Environment is not explosive, does not contain dust, aggressive gases and vapors in concentrations that destroy metal and insulation.
Lifetime — 30 years.
Warranty period from the date of commissioning — 2 years.

Parameters of MJW-126 and MJW-252

Parameter		Unit.	Data
Rated voltage		kV	110	220
Highest operating voltage		kV	126	252
Rated peak withstand current		A	80,100	100,125
Rated thermal current for 3 s:		kA	31.5,40	40,50
Power frequency rated withstand voltage			230	460
Power frequency rated withstand voltage	kV	kV	265	530
Lightning impulse withstand voltage			550	1050
Lightning impulse withstand voltage	kV	kV	630	1200

Parameter			Unit	Data
Creepage distance		II	mm	20	20
		III	mm	25	25
		IV	mm	31	31
Current breaking capacity (induced current)	Electro magnetic connection	A	А	50	80
	Electro magnetic connection	kV	kV	0.5	1.4
	Electro static connection	A	А		1.25
	Electro static connection	kV	kV	3	5
Mechanical resource			Number of cycles	3000	3000
Minimum breaking load			N	4000,6000,8000	8000^Н
Weight of one pole			Kg	110	230
Exposure to radio waves			μV	<2000	<2000

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Solutions

Dimensions of MJW-126 and MJW-252

Appearance and dimensions of the grounding conductor MJW-126

Note 1: the drawing shows one phase. In the full drawing, the angle between the lever and the axial line of the porcelain insulator is 45 °, the rest is similar. Note 2: the distance between the poles is not less than 1500 mm.