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  • GW4-40.5/126 Outdoor High-voltage AC Disconnector
High Voltage Switchgear

GW4-40.5/126 Outdoor High-voltage AC Disconnector

GW4-40.5/126 disconnector is self-developed in accordance with the disconnector perfection requir...

  • Product Introduction
  • Product Features
  • Technical Parameters

Product Introduction

GW4-40.5/126 disconnector is self-developed in accordance with the disconnector perfection requirements of China State Grid based on company’s original products. It is suitable to be used in the three-phase AC 50Hz outdoor power distribution system with the rated voltage of 40.5/126kV. Under the circumstance of on-load voltage and non-loaded current, the disconnector can connect, disconnect and isolate the electric circuit and equipment. Made up of base, post insulator and conductive parts, GW4-40.5/126 disconnector has three monopoles of door-type double post structure. Each monopole has two insulating supports parallel to each other and mounted vertically to the horizontal plane. The insulating posts are respectively installed in the bearing pedestal connected to the base, achieving opening and closing operation through a set of four-bar linkage. Fitted with the earthing switch on one side or both sides, the disconnector has four options, including earth-free, left earthing, right earthing, and double earthing.

 

Product Features

♦ The contact spring adopts an external pressure type, so as to avoid accidents caused by the spring current-carrying failure.

♦ The conductive tube adopts the square aluminum alloy tube; the flexible connection is made from copper; the conductive contact surface is silver-plated; high mechanical strength and good through-current effect.

♦ The drive parts adopt stainless steel axle pin and composite axle sleeve with less friction and reliable drive.

♦ A reliable interlock device is arranged between the main earthing knife-switch and earthing knife-switch to prevent incorrect manipulation effectively.

♦ The mounting base is fully-sealed, which can effectively prevent water and dust. The bearing pedestal is provided with an oil filler hole and can be maintained without power cut, thus improving the reliability and convenience of the switch.

♦ Large steel parts are hot-dip galvanized with good appearance quality and strong anti-corrosion capability.

 

Technical Parameters

No.

Item

Unit

Parameter

1

Rated   Voltage

kV

40.5

126

2

Rated Frequency

Hz

50

3

Rated   Current

A

1250

2000

2500

4000

4

Main Loop Resistance

μΩ

≤200

≤150

≤100

≤85

5

Temperature   Rise

Test Current

A

1.1-fold Rated Current

6

Rated Power Frequency (1 min) Withstand Voltage

To Earth

kV

95

230

Isolating   Fracture

118

230+70

Rated Lightning Impulse   Withstand Voltage (Peak)1.2∕50ms

To Earth

kV

185

550

Isolating   Fracture

215

550+100

7

Rated Short-time Withstand   Current & Duration

 Disconnecting Switch

kA/s

25/4

31.5/4

40/4

40/4

Earthing   Switch

25/4

31.5/4

40/4

40/4

8

Rated Peak   Withstand Current

kA

63

80

100

100

9

Conversion Current Capacity of   Opening & Closing Busbar

Conversion   Current

A

1600

Conversion Voltage

V

100

Breaking Times

Times

C-O 100 Times

10

Opening & Closing Small   Capacitance Current

A

1

11

Opening & Closing Small   Inductance Current

A

0.5

12

Induced Current   Capacity of Opening and Closing Earthing Switch

Electromagnetic   Induction

Inductive Current

A

50

Recovery Voltage

kV

0.5

Breaking Times

Times

OC 10 Times

Electrostatic Induction

Capacitance Current

A

0.4

Recovery   Voltage

kV

3

Breaking Times

Times

OC 10 Times

13

Mechanical Stability

Times

3000

14

Short-duration Power Frequency   Withstand Voltage for Auxiliary and Control Circuit

kV

2

15

Static Mechanical Load of   Terminals

Horizontal  Portrait

N

800

10001250

Horizontal Landscape

500

750

Vertical

750

1000

16

Post Insulator

Creepage Distance

mm

≥1256

≥3906

Height

550

1200