Introduction to the Functions of Low-Voltage Complete Sets of Equipment

Low-voltage complete sets of equipment are designed to receive, distribute, control, and protect electrical power in systems operating at AC ≤ 1000V or DC ≤ 1500V.

Core Functions

Power Distribution: These systems receive electricity from transformers or main supply lines and distribute it efficiently to various loads, including motors, lighting, and other equipment, ensuring stable and reliable power delivery . Protection: They safeguard circuits and connected devices against overloads, short circuits, and other electrical faults. Key protective components include circuit breakers, fuses, and thermal relays, which prevent damage and reduce fire hazards . Switching and Control: Low-voltage complete sets allow safe switching of circuits and control of connected equipment. This includes turning circuits on or off, isolating sections for maintenance, and controlling motor operations through motor control centers (MCCs) or power control centers (PCCs), . Monitoring and Measurement: Modern systems often include meters, relays, and digital monitoring units to track voltage, current, frequency, and power quality. Intelligent systems can provide real-time status, predictive maintenance, and remote control capabilities . Automation and Safety Interlocking: Advanced low-voltage complete sets integrate automation features, such as remote operation, fault diagnosis, and interlocking mechanisms to prevent misoperation and ensure compliance with safety protocols .

Structural and Component Overview

• Main Circuit (Primary Circuit): Responsible for power transmission; includes circuit breakers, fuses, contactors, and current transformers .
• Auxiliary Circuit (Secondary Circuit): Handles control and signal transmission; includes meters, control buttons, relays, and monitoring units .
• Cabinet Types: Common cabinets include incoming cabinets, outgoing cabinets, capacitor compensation cabinets, and coupling cabinets. Standard modular designs like MNS, GCS, and GCK are widely used for rated voltages ≤ 690V and currents up to 6300A .
• Physical Structure: Typically consists of a cabinet body, main and branch busbars, busbar chambers, installation areas for equipment, and cable connection chambers .

Applications

Low-voltage complete sets are widely used in factories, commercial buildings, new energy installations, and industrial automation systems, providing a centralized, safe, and efficient solution for electrical power management . They are essential for modern electrical infrastructure, supporting both traditional and intelligent digitalized power distribution systems.