Power distribution cabinets (boxes) are divided into power distribution cabinets (boxes), lighting distribution cabinets (boxes), and metering cabinets (boxes), which are the final equipment of the power distribution system. The power distribution cabinet is a general term for the motor control center. The power distribution cabinet is used in the occasions where the load is relatively scattered and there are few circuits; the motor control center is used in the occasions where the load is concentrated and there are many circuits. They distribute the electric energy of a certain circuit of the upper-level power distribution equipment to the nearest load. This level of equipment shall provide protection, monitoring and control of the load.
Grading:
(1) Level-1 power distribution equipment, collectively referred to as power distribution center. They are centrally installed in the substation of the enterprise, and distribute the electric energy to the lower-level power distribution equipment in different locations. This level of equipment is close to the step-down transformer, so the requirements for electrical parameters are relatively high, and the output circuit capacity is also relatively large.
(2) Secondary power distribution equipment is a general term for power distribution cabinets and motor control centers. The power distribution cabinet is used in the occasions where the load is scattered and there are few circuits; the motor control center is used in the occasions where the load is concentrated and there are many circuits. They distribute the electric energy of a certain circuit of the upper-level power distribution equipment to the nearest load. This level of equipment shall provide protection, monitoring and control of the load.
(3) The final power distribution equipment is collectively referred to as the lighting power distribution box. They are far away from the power supply center and are scattered small-capacity power distribution equipment.
Main switchgear types:
Low-voltage switchgear includes GGD, GCK, GCS, MNS, XLL2 low-voltage distribution boxes and XGM low-voltage lighting boxes.
Main difference:
GGD is a fixed type, and GCK, GCS, MNS are chests of drawers. GCK and GCS, MNS cabinet drawer push mechanism is different;
The main difference between GCS and MNS cabinets is that the GCS cabinet can only be used as a single-sided operation cabinet with a depth of 800mm, while the MNS cabinet can be used as a double-sided operation cabinet with a depth of 1000mm.
Advantages and disadvantages:
Withdrawable cabinets (GCK, GCS, MNS) save space, are easy to maintain, have many outgoing lines, but are expensive;
Compared with the fixed cabinet (GGD), it has fewer outlet circuits and occupies a larger area (if the space is too small to make a fixed cabinet, it is recommended to use a drawer cabinet).
The installation requirements of the switchboard (box) are: the switchboard (box) should be made of non-combustible materials; the production site and office with low risk of electric shock can be installed with an open switchboard; Closed cabinets should be installed in poor processing workshops, casting, forging, heat treatment, boiler rooms, carpentry rooms, etc.; closed or explosion-proof cabinets must be installed in dangerous workplaces with conductive dust or flammable and explosive gases. The electrical facilities; the electrical components, instruments, switches and lines of the distribution board (box) should be arranged neatly, installed firmly, and easy to operate. The bottom surface of the board (box) installed on the ground should be 5~10 mm above the ground; the center height of the operating handle is generally 1.2~1.5m; there are no obstacles within 0.8~1.2m in front of the board (box); the protection line is connected reliably; There shall be no bare electric body exposed outside the (box); the electrical components that must be installed on the outer surface of the board (box) or on the distribution board must have reliable screen protection.
The product also adopts a large-screen LCD touch screen to monitor all-round power quality such as voltage, current, frequency, useful power, useless power, electric energy, and harmonics. Users can see the operating status of the power distribution system in the computer room at a glance, so as to find potential safety hazards early and avoid risks early.
In addition, users can also choose functions such as ATS, EPO, lightning protection, isolation transformer, UPS maintenance switch, mains output shunt, etc., to ensure the safety and stability of the power distribution system in the computer room.
Post time: Dec-02-2022
