What are the types and classifications of low-voltage distribution cabinets?
Release time:
2021-01-05
Source:
A low-voltage distribution cabinet refers to a combination of one or more low-voltage switchgear cabinets and their associated control, measurement, signaling, and protection components, as well as the interconnections among all internal electromechanical equipment and the structural components. The rated current of a low-voltage distribution cabinet is for AC systems with a frequency of 50 Hz and a rated voltage of 380 V, and it is used for power conversion and control in power, lighting, and distribution applications.
Low-voltage distribution cabinet It refers to a combination of one or more low-voltage switchgear cabinets and their associated control, measurement, signaling, and protection components, as well as the interconnection of all internal electromechanical equipment and structural components. The rated current of a low-voltage distribution cabinet is for an AC 50 Hz power system with a rated voltage of 380 V, used for the conversion and control of electrical energy in power, lighting, and distribution applications.
PGL distribution cabinet: an indoor-installed, open-type, double-sided maintenance low-voltage distribution device. The cabinet’s basic structure is composed of steel plates and angle steel. The front of the cabinet is equipped with a door, and there is an instrument panel at the top of the cabinet face, featuring a small, hinged door that can be opened; this panel is used to mount indicating instruments. For cabinets installed in parallel, partitions are provided between adjacent cabinets to minimize the risk of faults within a single cabinet escalating into a larger-scale incident. Above the rear frame of the cabinet, the main busbar is mounted on insulating supports, and a busbar protective cover is installed to prevent metallic objects from falling from above and causing a short-circuit fault in the main busbar—a serious safety hazard. The neutral busbar is mounted on insulators at the bottom of the cabinet, while the main grounding point of the protective earthing system is welded to the lower part of the cabinet frame. The instrument door is also connected to the cabinet enclosure via a grounding point. The PGL-type AC low-voltage distribution panel is divided into the following types: low-voltage metering cabinet, low-voltage incoming feeder cabinet, capacitor compensation cabinet, utility power transfer cabinet, bus-tie cabinet, and low-voltage outgoing feeder cabinet.
Product Features
1. The cabinet frame is assembled from 8MF steel or C-shaped profiles, with mounting holes arranged on the frame in accordance with E=20 mm and E=100 mm modular pitches to enhance the versatility of product assembly.
2. The ZMJ-type busbar clamp, thermoformed from high-flame-retardant PPO material, features a modular, building-block assembly structure with high mechanical strength and excellent insulation performance. Cabinets with widths of 1000 mm and 1200 mm adopt a symmetrical double-door configuration on the front, while cabinets with widths of 600 mm and 800 mm feature a single-door design; the rear of the cabinet also employs a symmetrical double-door arrangement. The overall cabinet structure is designed for wall-free installation.
3. Low-voltage switchgear The door is connected to the frame via galvanized hinges, facilitating easy installation and removal; the door’s folded edge is finished with a rubber trim. Internal mounting components are secured to the frame using knurled screws, ensuring that the entire cabinet forms a complete grounding protection circuit. The top cover of the low-voltage switchgear can be removed as needed to simplify on-site assembly and commissioning of the main busbar.
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