MNS Low voltage withdrawable switchgear
Conditions of use
◆The ambient air temperature shall not be higher than+40℃ and not lower than-5℃,and its average temperature within 24 hours shall not be higher than +35℃;
◆Relative humidity: in clean air,it doesn’ t exceeds 50% at a maximum temperature of +40^c; higher relative humidity is allowable at lower temperatures (e.g. 90% at +20'c): however,it should be considered that occasional condensation may occur due to temperature change.
◆Altitude shall not exceed 2000m;
◆This equipment is suitable for transportation and storage at temperatures ranging from-25℃ to+55℃,and it can reach +70℃in a short period of time (not exceeding 24 hours).At these extreme temperatures,the equipment should not suffer any irreparable damage and should be able to function normally under normal condition;
◆Note:When the above normal service conditions cannot meet the usage requirement,it shall be negotiated between the user and the manufacturer.
◆When this equipment is used on offshore oil drilling platforms and nuclear power plants,separate technical agreement should be signed.
Technical parameter
|
Rated insulation voltage |
AC690V |
|
|
Rated working voltage |
AC400V |
|
|
Rated current of main busbar |
≤6300A |
|
|
Rated withstand current of main busbar(1s) |
50kA,80kA |
|
|
Rated peak withstand current of main busbar |
105kA,176kA |
|
|
Maximum working current of distribution busbar (vertical busbar) |
1000A |
|
|
Distribution busbar(peak current of vertical busbar) |
|
|
|
|
Standard type |
105kA(maximum)/0.1s |
|
|
Enhanced type |
176kA(maximum)/0.1s |
Protection level
Compliant with IEC529 and DIN40050 standards
IP30 provides protection for solid larger than φ2.5MM
IP40 provides protection for solid larger than φ1.0MM
IP54 provides protection against dust and splash in any direction
When ordering IP54 protection level,it should be negotiated with the manufacturer
Cabinet structure
The basic structure of the switchgear cabinet is assembled by C-shaped profiles.C-shaped profiles are made by bending steel plates with E=25mm as the modular installation hole.
All cabinet frames and inner partitions are treated with galvanized purification.The surrounding door panels and side panels are coated with high-voltage electrostatic spraying.
The basic structure of the cabinet is shown in Figure 1:the basic dimensions of the cabinet are shown in Figure 2,Tables 1and 2
Switch cabinet type
Power distribution center cabinet (PC):Emax, MT, 3WN, AH, ME series circuit breakers can be used.
Motor control center cabinet (MCC): Assembled from draw-out units of various sizes, the main switch of each circuit adopt high breaking molded case circuit breaker or rotary load switch with fuse, Power factor automatic compensation cabinet (with manual, automatic and remote power factor compensation device)
Cabinet frame structure composed of c-shaped profiles (Figure 1)
Cabinet schematic diagram (Figure 2)
Installation diagram
Solution 1: Welding installation
Solution 2: Bolt installation
Installation diagram of busbar bridge
