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LJ-XGN Type-12 Solid-Insulated AC Metal-Enclosed Switchgear


LJ-XGN Type-12 Solid-Insulated AC Metal-Enclosed Switchgear


Product Overview

 

The LJ-XGN-12 solid-insulated AC metal-clad switchgear is a fully insulated, fully sealed, compact switchgear. All live parts and switching elements are completely enclosed within an epoxy resin housing molded by APG injection molding. Functional units are interconnected via fully insulated solid busbars. As a result, the entire switchgear is unaffected by external environmental conditions, ensuring reliable equipment operation and the safety of operating personnel.

This equipment is suitable for 12kV, 50Hz three-phase AC distribution systems and can be used in ring network power supply or terminal applications. It is particularly well-suited for locations with limited space, harsh environmental conditions, and requirements for maintenance-free operation—such as subway stations, chemical plants, oil refineries, underground electrical rooms in high-rise buildings, and other similar facilities. It can also be employed in prefabricated substations and outdoor switchgear cabinets. The equipment can be configured with protective devices, communication modules, and backup power supplies to achieve automated power distribution. Since it does not contain sulfur hexafluoride, there is no need to worry about gas leakage issues.

 

Environmental conditions

 

1

Ambient temperature

Not higher than +40℃ and not lower than -15℃, with the average temperature over 24 hours not exceeding +35℃.

2

Altitude

Altitude not exceeding 1000m.

3

Relative humidity

The daily average shall not exceed 95%, and the monthly average shall not exceed 90%.

4

Earthquake intensity

No more than 8 degrees.

5

Water vapor pressure

The daily average shall not exceed 2.2 kPa, and the monthly average shall not exceed 1.8 kPa.

6

 

Locations free from fire hazards, explosion risks, severe contamination, chemical corrosion, and intense vibrations.

 

Performance parameters

 

Serial number

Name

Unit

Numerical value

1

Rated voltage

kV

12

2

Rated current

A

630

3

Rated frequency

Hertz

50/60

4

1-minute power frequency withstand voltage between terminals and to ground

kV

42

5

1-minute power-frequency withstand voltage isolation break point

kV

48

6

Lightning impulse withstand voltage (peak) 
Between poles, to ground

kV

75

7

Lightning impulse withstand voltage (peak) 
Isolation break

kV

85

8

Main bus rated current

A

630 1250

9

Rated current of the busbar branch

A

630

10

Rated short-circuit breaking current

kA

20

11

Rated short-time withstand current / Rated short-circuit duration

kA/4S

20

12

Rated peak withstand current

kA

50

13

Rated short-circuit making current

kA

50

14

1-minute auxiliary circuit power-frequency withstand voltage

V

2000

15

Protection level

 

IP4X (If the circuit breaker door or compartment is open, it’s IP2X)

16

Rated voltage of the auxiliary control circuit

V

AC or DC 110/220

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