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Disconnector GW4-40.5,126,145,252

Description

The disconnector GW4-40.5,126,145,252 is a high-voltage disconnector of an open installation for alternating current networks from METTZ Group.

The disconnector of the GW4 series is an outdoor switching device designed to turn on and off de-energized sections of industrial AC electric circuits with a rated voltage of 35-220 kV with the creation of a visible gap, as well as grounding of disconnected sections using stationary grounding conductors. The disconnector complies with the requirements of IEC IEC 62271-102.

Operating Conditions of GW4-40.5,126,145,252

ambient temperature: -40 ° C ~ + 40 ° C;
height above sea level: no more than 2000 m;
maximum wind speed: 34 m / s;
seismic resistance: horizontal acceleration — 0.250 g, vertical acceleration — 0.125 g
ice thickness: not more than 10 mm .;
degree of pollution: level II, III, IV;
installation in fireproof, explosionproof places;
lack of chemical corrosion and frequent vibration.

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Parameters

Technical Parameters of GW4-40.5,126,145,252 High Voltage Disconnectors

Description		Unit	Data
Rated voltage		кВ	35	110	132	220
Highest operating voltage		кВ	40.5	126	145	252
Rated current		A	630, 1250	1250, 2000	1250, 2000	1250, 2000, 3150
Rated thermal current for 3 s:		kA	31.5	31.5,40	31.5,40	31.5,40, 50
Rated peak withstand current		kA	80	80,100	80,100	80, 100, 125
Rated power frequency withstand voltage		kV	95	230	275 (330)	460
Rated power frequency withstand voltage		kV	110	265	315 (378)	530
Lightning impulse withstand voltage (peak)		kV	185	550	650 (780)	1050
Lightning impulse withstand voltage (peak)		kV	215	630	750 (900)	1200
Creepage distance			20	20	20	20
		m/kV	25	25	25	25
			31	31	31	31
		N	4000	4000, 6000	4000, 6000	6000, 8000
Minimum breaking load	Nominal induced current Nominal induced voltage	А kV		50 0.5	2	1.4
	Rated Induced Current	А		0.4	2	1.25
	Rated Induced Voltage	kV		3	6	5
Mechanical abrasion resistance		A	3000	3000	3000	3000
Weight of one pole		kg	80	240	300	650

Design features

The high-voltage disconnector of the GW4 series is a two-column horizontal and rotary disconnector of external installation.

When turned on, two speakers simultaneously turn inward. When disconnected, the speakers simultaneously turn outward, stop 90 °, forming a visible gap. When the earthing switch is turned on, the grounding knife moves up. The movable contact moves up and engages with the fixed contact, which completes the switching operation. The shutdown process is the opposite.

The conductive part of the main knife is made of aluminum alloy.

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Solutions

There are three categories of disconnector:

without ground electrode
with earthing switch,
with two grounding conductors.

The disconnector is equipped with a manual drive or electric drive.

Benefits:

simplicity of design,
superior performance and reliable performance;
high reliability due to the use of self-supporting contacts;
no verification and adjustment is required during operation, contact pressure does not change;
higher ability to cleanse oneself;
contact pressure automatically increases with the passage of a short circuit current;
simplicity in assembly, simplicity in adjustment and adjustment