How does low voltage switchgear achieve a fully enclosed and fully insulated design?

Publish Time: 2025-01-20

The fully enclosed and fully insulated design of low voltage switchgear is an important guarantee for its safety and reliability, especially in high humidity, dusty or corrosive environments.

1. Shell design: fully enclosed structure

Dustproof and waterproof design: The shell of low voltage switchgear adopts a fully enclosed structure, which meets international protection level standards (such as IP65 or higher). The shell material is usually high-strength steel plate or corrosion-resistant aluminum alloy, which can effectively prevent the intrusion of dust, moisture and other external pollutants.

Sealing technology: Use high-quality sealing materials (such as silicone or EPDM rubber) and sealing structure design to ensure the sealing of the cabinet and prevent water and air penetration.

Pore-free design: Minimize the openings on the cabinet surface, and use rain caps, protective covers or sealing gaskets when necessary to ensure that water droplets and moisture cannot enter the cabinet.

2. Insulation material selection

High-performance insulation materials: All electrical components and connection parts inside the switch cabinet are made of high-performance insulation materials, such as polyester film, epoxy resin, polytetrafluoroethylene (PTFE), etc. These materials have excellent electrical insulation performance and high temperature resistance.

Insulation design: The insulation support and partition inside the switch cabinet adopt an integrated or injection-molded structure to ensure the stability and consistency of insulation performance.

Surface coating: The surface of the internal metal parts adopts a high-temperature and corrosion-resistant insulation coating (such as epoxy powder coating) to further improve the insulation performance and durability.

3. Modular design

Separation unit: The switch cabinet adopts a modular design to separate electrical components with different functions (such as circuit breakers, contactors, relays, etc.) in independent units to reduce the risk of fault propagation.

Insulation partition: Insulation partitions are set between each functional unit to ensure electrical isolation between different electrical circuits.

Standardized connection: Standardized insulation connectors and terminals are used to facilitate installation and maintenance while ensuring the insulation performance of the connection part.

4. Full insulation treatment of the conductive part

Bus system: The main busbar and branch busbar of the switch cabinet usually adopt a fully enclosed insulated bus duct design, with an outer layer of insulating material wrapped to prevent contact and short circuit risks.

Connection terminals: All electrical connection terminals use insulated terminals or insulating protective covers to ensure that the connection points are not exposed.

Grounding system: The design of the grounding busbar and grounding terminal meets the standards to ensure the reliability and safety of the grounding system.

5. Environmental adaptability design

Moisture-proof treatment: A desiccant or dehumidifier is installed inside the cabinet to absorb moisture to keep the interior dry and prevent the insulation performance from deteriorating.

Anti-corrosion design: The cabinet and internal components are coated with anti-corrosion coating or stainless steel materials to adapt to corrosive environments such as chemical and coastal areas.

High temperature resistant design: Both electrical components and insulating materials must meet high temperature resistance requirements and adapt to the high temperature environment of industrial sites.

6. Intelligent monitoring and protection

Temperature monitoring: Temperature sensors are installed at key locations to monitor the temperature inside the cabinet in real time to prevent insulation failure due to overheating.

Humidity monitoring: Install humidity sensors to monitor the humidity in the cabinet in real time and start the dehumidification function when necessary.

Gas monitoring: For some special applications, a gas concentration monitoring device can be installed to prevent gas leakage.

7. Installation and maintenance

Convenient installation: The prefabricated modular design is adopted, which is easy to install on site, reduces the commissioning time, and reduces the impact of installation on insulation performance.

Maintenance safety: The cabinet design is convenient for maintenance personnel to operate, and at the same time provides safety isolation measures such as power-off indication and protective cover to ensure the safety of personnel and equipment during maintenance.

The fully enclosed and fully insulated design of low-voltage switchgear achieves a high level of electrical isolation and environmental protection capabilities through comprehensive measures such as shell design, insulation material selection, modular design, insulation treatment of conductive parts, environmental adaptability design, intelligent monitoring and protection. This design not only improves the safety and reliability of the equipment, but also extends the service life of the equipment, and is suitable for application requirements in various complex environments.