In medium-voltage power distribution systems, the most widely used ring main units (RMUs) include SF6 gas-insulated, solid-insulated, and environmentally friendly gas-insulated RMUs. However, the environmental impact of SF6 as a greenhouse gas and the challenges in recycling solid insulation materials are expected to limit the future use of SF6 gas-insulated and solid-insulated RMUs. As the global focus on sustainable development intensifies, fully insulated, eco-friendly gas RMUs that align with the latest environmental standards are positioned to become a key solution in the industry.
The EcoAir-HBX-24kV-630A series represents an advanced generation of “fluorine-free and low solid waste” green circuit breakers and environmentally friendly gas-insulated RMUs, developed as sustainable replacements for traditional SF6 gas-insulated systems.
This eco-friendly circuit breaker switch incorporates a high-strength integrated longitudinal beam that houses the vacuum arc-extinguishing chamber, providing a robust, reliable structure with simplified installation and maintenance. An integrated isolation spindle precisely controls the opening, closing, and grounding operations without the need for additional transmission arms, reducing operating force and enhancing accuracy. The main shaft is constructed from epoxy fiberglass, ensuring high mechanical strength and insulation performance. To further improve safety, silicone umbrella skirts are installed between phases to increase creepage distance. This circuit breaker is compatible with both sealed air chamber RMUs and standard pressure metal-enclosed RMUs.
Utilizing a combination of environmentally friendly gas insulation and vacuum interruption technology, this solution offers superior performance, is unaffected by altitude, and requires no maintenance, making it highly adaptable to various environmental conditions. Its compact design minimizes space requirements, making it suitable for a wide range of applications, including power grids, large industrial facilities, rail transit systems, and commercial buildings.
The EcoAir-HBX-24kV-630A series is ideal for indoor and outdoor ring network switching in 10-24kV medium voltage distribution networks, facilitating energy distribution with flexible configurations for top and side expansion, as well as common box solutions (up to three units). With over 90% parts commonality between upper and lower isolation configurations, this product ensures high stability, versatility, and full compliance with industry type test standards.
Internal Structure of Lower Isolation Dry Air Insulated Switchgear
Switch Cabinet Side Expansion Plan
Switch Cabinet Top Expansion Plan
Installation Notes
This product should be installed on the embedded channel steel on the concrete platform, and the platform base should be enough to bear the total weight of the equipment.
Note: The foundation channel steel for secondary pouring is buckled, and the unevenness per meter is no more than 1mm. The switch cabinet is fixed on the foundation channel steel and the basic load of the welded switch cabinet is allowed to be 500-700kg/unit.
Foundation and Overall Dimensions (mm):
Switch Cabinet and Appearance Installation Dimensions (mm):
The height of the switch cabinet is 1650mm (without independent instrument room). If independent instruments are required, the switch height is 2000mm. The standard configuration cabinet depth is 850mm.
Use Conditions
EcoAir-HBX-15.6/24kV 630A is generally operated/serviced under normal indoor conditions and complies with IEC 62271-1 and GB3906. The specific conditions are as follows:
1. Ambient temperature.
Maximum temperature: +40℃.
Maximum temperature (24-hour average): +35°C.
Minimum temperature: -40℃.
2. Humidity. Maximum average relative humidity measured over 24 hours: 95%.Maximum average relative humidity measured over one month: 90%.
3. The maximum altitude of installation without reducing gas pressure is 1500 meters. When the installation altitude exceeds 1500 meters, please contact pre-sales technology.
4. Operation must comply with the requirements of IEC62271-1 and GB3906 standards. For special operating conditions, the end user and the manufacturer must reach an agreement. If special harsh operating environments are involved, the manufacturer must be consulted. For example, when electrical equipment is installed at an altitude above 1,500 meters, the atmospheric pressure will decrease, causing the air box to bulge.
Product Maintenance
All components inside the 15.6kV/630A are maintenance-free during the declared product life.
The isolation and grounding positions can be observed to provide safety guarantee for operation and cable construction.
The system loop is completely isolated from the atmosphere, and a special arc pressure relief channel is designed on the air box to ensure the safety of operators and equipment.
The mechanical part is located outside the air box and behind the front panel, making it easier to operate and replace. The surface of the mechanical part has undergone anti-corrosion treatment, and its movable parts have been lubricated before leaving the factory, which can meet the use of the product life cycle. In extreme environments (dust, sand and dirt) inspection, maintenance and, in some cases, replacement may be necessary.