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Switchgear Cabinet
KGC-40.5 series SF6 gas-insulated ring main unit

The KGC series SF6 gas fully insulated compact ring main unit (RMU) is a new type of medium-voltage switchgear with SF6 gas insulation independently developed by Mojü Company. The product adopts a modular design and can be arbitrarily arranged according to different design schemes, achieving a perfect combination of the common box unit and the expandable unit to meet the flexible use requirements of compact switchgear in various secondary transmission and distribution substations.

The KGC series switchgear is a fully sealed system. All its primary components are enclosed in a stainless-steel housing and are not affected by the environment. It has the characteristics of reliable operation, safety guarantee, compact structure design, small space occupation, maintenance-free, and long service life.

The product has passed the type test at the national high-voltage electrical appliance test center and is widely used in small secondary substations, box-type switch stations, industrial and mining enterprises, airports, railways, commercial areas, high-rise buildings, expressways, subways, tunnels, and places with harsh natural conditions.

  • Product Details

Execution standards

GB/T3804 High-voltage alternating-current load switches for 3.6kV to 40.5kV

GB/T1984 High-voltage alternating-current circuit-breakers

GB/T16926 High-voltage alternating-current load switch-fuse combinations

GB/T1985 High-voltage alternating-current disconnectors and earthing switches

GB/T3906 3.6kV to 40.5kV Alternating-current metal-enclosed switchgear and controlgear

GB/T11022 Common technical requirements for high-voltage switchgear and controlgear standards

GB/T4208 Degrees of protection provided by enclosures (IP code)


DL/T404 3.6kV to 40.5kV Alternating-current metal-enclosed switchgear and controlgear

GB/T311.1 Insulation co-ordination - Part 1: Definitions, principles and rules


Main Technical Parameter Table of KGC-40.5 Ring Main Unit

Serial number

Project

unit

Load switch unit

Circuit breaker unit

Rated voltage

kV

40.5 

40.5 

Rated frequency

Hz

50 

50 

3

Rated current

A

630 

630 

4

Rated

Insulation

Level

1min Power 

frequency withstand

 voltage

Interphase, to ground

kV

95 

95 

fracture surface

kV

118 

118 

Control and auxiliary circuits

kV

Lightning

 impulse withstand

 voltage

Interphase, to ground

kV

185 

185 

fracture surface

kV

 215 

215 

Rated short-time withstand current / Duration

kA/s

25/3

25/3

Rated peak withstand current

kA

63 

63 

Rated short - circuit breaking current

kA

——

25 

Rated short - circuit making current

kA

63 

63 

Rated transfer current

A

——

——

10 

Rated active load breaking current

A

630 

——

11 

Rated closed-loop breaking current

A

630 

630 

12 

Rated operating sequence

/

——

O-0.3s-CO-180s-CO

13 

Mechanical life

Load switch/Circuit breaker

times

5000 

10000 

Isolation/Earthing Switch

times

3000 

3000 

14 

Loop resistance

μΩ

≤150

≤180

15 

Rated inflation pressure (gauge pressure at 20℃)

MPa

0.04 

16 

Annual relative gas leakage rate

year

  ≤0.01%

17

Insulating gas


  SF6

18

Protection level

Compartment (IP code)

/

IP2XC

Gas tank (IP code)

/

  IP67

Cabinet (IP code)

/

IP4X

Cabinet (IK code)

/

IK10


Installation size table

Number of shared box units

Net width of the gas tank

450(C)/500(V)

900(C)/1000(V)

Note: The total width of the cabinet body is determined by the end plate matched with the user's plan. In addition, according to the user's needs, cabinet types with standardized dimensions of the State Grid can be provided.

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