BMT's Metal Clad Switchgear (MCSG) has the highest level of safety andreliability features.
The segregation between compartments (Circuit Breaker, Main Bus Bar, Cable, and Low Voltage compartments) using metal partitions minimizes the spread of internal arc / explosion accident to peripheral devices.
Passed full type test verification including internal arc testing (KERI, The Korea Electrotechnology Research Institute) in accordance with IEC 62271-200 standard.BMT MCSG
In accordance with IEC specifications on switchboards, grades are usually classified according to the closed class, partition insulation, draw-out structure, etc. from the user's safety perspective as follows:
(G Graade, F2 Grade)
|Definition||Switchgear structure for general service and procurement.
Embedding the device in a grounded metal box and minimizing partitions.
|Metal-Clad Type like structure, allowing at least one non-metallic partitions.||highest grade structure of switchgear.Placing the device in separate compartments by earthing metal partitions.|
|Compartment classification||Most are none partition structures. Low protection grade of IP2X even partition equipped. Fewer compartments than the Compartment type.||Similar basic structure with Metal-Clad type, but allowing one or more non-metallic partitions.
Mostly consist of insulated partitions for electrical penetration.
Treats same as the Compartment type when some load conductors are mixed in the busbar compartment and cover either of conductor with insulation.
|Place the device in at least four separate compartments (breaker room, mother room, cable room, control room) with metal partitions that meet IP protection rating of 4X or higher. Use bushing for formal electrical penetration.|
|Shutter||none||Installation in drawout type breakers (metallic or non-metallic)|
MCSG Grade > G Grade > F2 Grade > E Grade
MCSG grade switchboard is a top-end switchboard that requires certification of the arc pressure-proof structure in an independent compartment.
BMT Electricity Department produces switchboard of all grades from E grade to the top-class, MCSG grade.
|Power Frequency Withstand Voltage||㎸/1M=min||20||28||38||50|
|Lightning Impulse Voltage||㎸［1.2x50㎰］||60||75||95||125|
|Short Time Current||㎄/s||25/1||25/1||25/1||25/1|
|Internal Arc Current||㎄/s||25/1||25/1||25/1||25/1|
|Degree of Protection||IP||4×||4×||4×||4×|
|Depth* * *||㎜||(1800)2000||(1800)2000||(1800)2000||2000|