LMG-12/24 Gas Insulated Metal-Enclosed Switchgear

Negotiable
China
No.868 Jiahang Road, Jiading District, Shanghai
+86 21 69900817
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Product Introduction

The LMG type gas insulated metal-enclosed switchgear is an SF6 ring main unit composed of completely gas-sealed stainless steel gas tank units. The gas tanks are connected via silicone rubber busbar connectors. The development and research of this product have reached the world's advanced level. Combined with world-class gas tank processing equipment, advanced helium leak detection, and automated assembly lines, the quality and reliability of the product are guaranteed. LMG is suitable for 12-24kV ring main power supply systems as a power control and protection device, and is also suitable for installation in box-type substations.

Product Features:

·The stainless steel gas tank shell adopts the world's most advanced laser welding technology.

·Unaffected by the environment, all high-voltage live parts are sealed in a gas tank filled with micro-positive pressure SF6, achieving miniaturization, lightweight, and full insulation of the product.

·Modular design. Various main wiring schemes can be realized by combining different modules, and the combination mode can be changed according to user needs to form a multi-circuit switch system.

·Silicone rubber connectors are used to realize arbitrary expansion of the ring main unit.

·Fully shielded cable termination heads.

·Can be equipped with circuit breaker cabinets.

·Can be equipped with high-voltage monitoring components and integrated digital relays.

·Can be equipped with high-voltage metering cabinets.

·Can be equipped with remote control and monitoring units.

Product Parameters

Item

Unit

Parameter

Rated Voltage

kV

12

24

Rated Frequency

Hz

50

Rated Current

A

630/1250

Combined Apparatus Rated Current

A

125

70

1min Power Frequency Withstand Voltage (RMS)

To Earth and Between Phases

kV

42

65

Across Isolating Distance

48

79

Lightning Impulse Withstand Voltage (Peak)

To Earth and Between Phases

kV

75

125

Across Isolating Distance

85

145

Thermal Stability Current (RMS)

Main Circuit 4s

kA

20/25

20

Earthing Switch 4s

20/25

20

Earthing Connection Circuit 2s

17.4/21.7

17.4

Dynamic Stability Current (Peak)

Main Circuit

kA

50/63

50

Earthing Switch

50/63

50

Earthing Connection Circuit

43.5/54.6

43.5

Load Switch Rated Short-Circuit Making Current (Peak)

kA

50/63

50

Load Switch Rated Active Load Breaking Current

A

630

Load Switch Rated Loop Breaking Current

A

630

Load Switch 5% Rated Active Load Breaking Current

A

31.5

Load Switch Rated Cable Charging Breaking Current

A

10

16

Combined Apparatus Rated Short-Circuit Breaking Current

kA

31.5

Combined Apparatus Rated Transfer Current

A

1760

1200

Load Switch Rated Active Load Breaking Operations

Times

200

Rated Earth Fault Breaking Current and Operations

A

63 (10 Times)

Circuit Breaker Rated Short-Circuit Breaking Current and Operations

kA

20/25 (30 Times)

Cable and Line Charging Breaking Current under Earth Fault Conditions

A

31.5 (10 Times)

Mechanical Life

Circuit Breaker

Times

10000

Load Switch

Times

6000

Earthing Switch

Times

3000

SF6 Gas Rated Pressure (rel. 20°C)

MPa

0.03

SF6 Gas Leakage Rate

Per Year

≤0.05%

Rated Supply Voltage of Closing/Opening Device and Auxiliary Circuits (Ua)

V

DC24,48,110,220, AC220

Expected Service Life

Years

30