GW4-126 126kV Outdoor HV Disconnector

Meaning of Type

Product Overview

GW4-126 series outdoor AC high-voltage disconnectors are designed for 50Hz power systems with a nominal system voltage of 110kV and an equipment rating of 126kV. They provide circuit isolation under no-load conditions and a clearly visible isolating distance between the energized system and equipment taken out of service.

A pollution-resistant version is available for locations with higher contamination levels, helping reduce the risk of pollution flashover during outdoor service. When an earthing switch is specified, the main disconnector and earthing switch use independent operating mechanisms. A mechanical interlock maintains the correct operating sequence and helps prevent incorrect operation.

Key Features

Designed for 110kV outdoor substations and switchyards, with a 126kV equipment rating.

Rated-current options of 630A, 1250A, 1600A and 2000A.

Visible isolation for inspection, maintenance and equipment separation under no-load conditions.

Optional earthing switch with an independent operating mechanism and mechanical interlocking.

Type I and Type II earthing-switch configurations are available for 110kV applications; the Type II version has peak and short-time withstand capability corresponding to the main disconnector.

Pollution-resistant version available for heavily polluted outdoor locations.

Manual CS17 or motor-operated CJ6 mechanism options shown in the reference installation arrangement.

Three-pole linked operating arrangement for coordinated phase operation.

 

Technical parameters

Rated voltage	Maximum voltage	Rated current	Dynamic stable current (Valid value)	Thermal stable current (Valid value)	One-minute power frequency withstand voltage (RMS value)		Lightning impulse withstand voltage (peak)		Opening/ closing time	Rated static tensile force at the end of the pull wire	Break the capacitor current
					To the ground	Fracture	To the ground	Fracture
kV	kV	A	kA	kA-S	kV		kV		S	N	A
12	12	630	50	20-4	75	85	165	200		450
15	15	1250	80	31.5-4
24	24	1600	100	40-2
		2000
35 (40.5)	40.5	630	50	20-4	80	90	185	215		500
		1250	80	31.5-4
		1600	100	40-2
		2000
63 (72.5)	72.5	630	50	20-4	140	160	325	375		500
		1250	80	31.5-4
		1600	100	40-2
		2000
		2500	125	50-2
110 (126)	126	630	50	20-4	230 (185)	265 (450)	550 (450)	630 (520)		750
		1250	80	31.5-4
		1600	100	40-2
		2000
(145)	145	1250	80	31.5-4	275	315	650	750	6+1	Longitudinal 500 Cross 170 Longitudinal 1250 Cross 420
		1600	100	40-2
		2000
		3150	125	50-3
220 (245)	252	1250	100	40-3	450	530	1050	1200	6+1	1000	0.5
		1600	125	50-3
		2000
		2500

Earthing Switch and Interlocking

For the 110kV application, the earthing switch can be configured as Type I or Type II. The Type II earthing switch has peak and short-time withstand performance corresponding to that of the main disconnector. The main disconnector and earthing switch are operated by independent mechanisms, with a mechanical interlock provided to maintain the correct operating sequence.

Typical Applications

Outdoor substations and switchyards in 110kV transmission and distribution systems.

Visible isolation of busbars, circuit breakers, instrument transformers and other high-voltage apparatus during maintenance.

Opening and closing energized circuits under no-load conditions.

Pollution-prone outdoor sites when the pollution-resistant version is selected.

 

Installation dimension drawing

Reference Installation Components

No.	Component	Unit	Qty.	Remark
1	Disconnector body	Pole	3	-
2	Universal joint	Pc.	2	-
3	Main-blade vertical connecting rod	Rod	1	-
4	Earthing-blade vertical connecting rod	Rod	1	-
5	CJ6 motor operating mechanism	Set	1	Configuration option
6	CS17 manual operating mechanism	Set	1	Configuration option
7	Single-pole linkage rod	Rod	3	-
8	Main-blade linkage rod	Rod	1	-
9	Main-blade three-phase horizontal linkage	Rod	2	-
10	Earthing-blade linkage rod	Rod	1	-
11	Earthing-blade three-phase horizontal linkage	Rod	1	-
12	Support structure (yellow section in source drawing)	Set	1	Customer supplied

Ordering Information

Please provide the following information for product selection and quotation:

·Nominal system voltage and required equipment rating.

·Rated normal current.

·Required peak and short-time withstand current, including duration.

·Earthing-switch requirement: without earthing switch, Type I or Type II.

·Standard or pollution-resistant version.

·Manual or motor-operated mechanism and required control voltage, where applicable.

·Installation altitude, ambient temperature range, pollution level, wind and icing conditions.

·Required quantity, destination country, project standard and document requirements.

FAQ

1. Why is the product described as 110kV / 126kV?

The nominal system voltage is 110kV, while 126kV is the equipment rating used for the disconnector. Both values are relevant and should be stated clearly in the project specification.

2. Can the GW4-126 interrupt load or fault current?

No. The GW4-126 is a disconnector intended to open or close energized circuits under no-load conditions and to provide visible isolation. Load and fault-current interruption must be performed by the appropriate circuit breaker or switching device.

3. Which rated-current options are available?

The supplied technical data lists 630A, 1250A, 1600A and 2000A options for GW4-126.

4. Is an earthing switch available?

Yes. An earthing switch can be specified, with Type I and Type II arrangements available for the 110kV application. The required configuration should be confirmed at the ordering stage.

5. Is there a version for polluted environments?

Yes. The W-designated pollution-resistant version is intended for locations with higher contamination levels and helps reduce the risk of pollution flashover.

6. Which operating mechanisms can be supplied?

The reference installation arrangement shows the CS17 manual mechanism and the CJ6 motor operating mechanism as configuration options. The selected mechanism and any control-voltage requirement must be stated in the order.

7. What information is needed for a quotation?

Please provide the rated current, short-circuit withstand requirement, earthing-switch arrangement, operating mechanism, site conditions, quantity, destination country and applicable project standard.

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