24kV Metal-Clad Switchgear for Indonesia

24kV Metal-Clad Switchgear for Indonesia’s 20kV Power Distribution Systems

Indonesia continues to expand its power infrastructure to support industrial development, mining, commercial facilities, renewable energy, and urban construction. As new projects are connected to medium-voltage distribution networks, selecting reliable switchgear becomes an important part of ensuring system safety and operational continuity.

A common question from overseas EPC contractors is why Indonesia’s 20 kV distribution networks typically use 24 kV metal-clad switchgear. The answer lies in the standardized rated voltage classes defined in IEC 62271. Although the system operates at 20 kV, 24 kV is the commonly specified equipment class for this application, providing the electrical insulation performance required for medium-voltage distribution systems.

For EPC contractors and industrial project owners, understanding this distinction is essential when selecting medium-voltage equipment for new installations or system upgrades.

Understanding 24kV Metal-Clad Switchgear

Metal-clad switchgear is a type of indoor medium-voltage switchgear in which the major electrical components are installed in separate grounded metal compartments. This compartmentalized construction improves personnel safety, facilitates maintenance, and limits the propagation of internal faults.

A typical 24kV metal-clad switchgear assembly consists of:

Busbar Compartment

Contains the main copper busbars that distribute power throughout the switchgear lineup.

Circuit Breaker Compartment

Houses a withdrawable vacuum circuit breaker, allowing maintenance or replacement without dismantling the entire panel.

Cable Compartment

Provides space for incoming and outgoing cables, current transformers (CTs), voltage transformers (VTs), surge arresters (where required), and cable terminations.

Low-Voltage Compartment

Contains protection relays, metering devices, control circuits, and communication equipment, separated from the medium-voltage compartments for improved safety.

Why 24kV Equipment Is Selected for 20kV Systems

A common question from overseas buyers is why projects operating at 20kV specify 24kV metal-clad switchgear.

The reason is that 24kV refers to the equipment’s rated voltage class rather than the normal operating voltage of the electrical network. Under IEC 62271, medium-voltage switchgear is classified according to standardized rated voltage levels. For 20kV distribution systems, 24kV equipment is commonly selected to meet the applicable insulation and dielectric performance requirements.

This approach is widely adopted in many IEC-based power systems, including projects in Indonesia.

Typical Technical Considerations for Indonesia Projects

Although each project has its own specification, engineers generally evaluate the following parameters when selecting metal-clad switchgear:

The final ratings should always be determined according to the project’s electrical studies and technical specifications.

Applications of 24kV Metal-Clad Switchgear in Indonesia

Because of its flexibility and high reliability, 24kV metal-clad switchgear is widely applied in medium-voltage distribution systems serving:

• Mining and mineral processing facilities
• Manufacturing plants
• Industrial parks
• Bâtiments commerciaux
• Airports
• Data centers
• Utility substations
• Renewable energy projects

Compared with compact ring main units (RMUs), metal-clad switchgear is generally preferred where projects require higher current ratings, multiple feeders, advanced protection schemes, or future system expansion.

The final equipment selection should always be based on the network configuration and project requirements.

Designing for Indonesia’s Operating Environment

Indonesia’s tropical climate should be considered during switchgear design and equipment selection. Depending on the project location, engineers may need to consider factors such as humidity, rainfall, coastal environments, dust, and operating temperatures.

To improve long-term reliability, project specifications may include features such as:

• Anti-condensation heaters
• Corrosion-resistant surface treatment
• Appropriate ventilation arrangements
• High-quality insulation materials
• Environmental protection measures suitable for the installation site

The required configuration should be determined according to the project’s environmental conditions and applicable technical specifications.

Haocheng Electric’s Experience in Indonesia

Guangdong Haocheng Electric has supplied 24kV metal-clad switchgear to overseas markets, including Indonesia, supporting industrial, infrastructure, and power distribution projects.

Our engineering team works closely with EPC contractors, consultants, and project owners to develop switchgear solutions based on project-specific single-line diagrams and technical requirements. Depending on the application, we can provide customized configurations, protection schemes, busbar arrangements, and component selections that comply with IEC standards.

With a manufacturing base covering more than 50,000 square meters, Haocheng Electric integrates sheet metal fabrication, copper busbar processing, powder coating, assembly, routine testing, and quality inspection within a modern production facility. This integrated manufacturing capability enables stable product quality, flexible customization, and reliable delivery for international projects.

Through our experience in supplying medium-voltage switchgear to Indonesia, we are familiar with export documentation, factory testing procedures, packaging requirements, and the technical expectations of overseas customers.

Choosing a Reliable Metal-Clad Switchgear Supplier

Selecting a medium-voltage switchgear supplier involves more than comparing equipment prices. Engineering capability, manufacturing quality, testing procedures, and international project experience all contribute to the long-term reliability of the power distribution system.

When evaluating a supplier, it is advisable to consider:

• Compliance with IEC standards
• Engineering customization capability
• Manufacturing capacity
• Factory routine testing
• Export project experience
• Technical documentation
• After-sales technical support

A supplier with practical experience in international projects can help simplify project execution while ensuring compliance with technical requirements.

Conclusion

As Indonesia continues to invest in power infrastructure and industrial development, 24kV metal-clad switchgear will remain an important solution for medium-voltage distribution systems operating at 20kV.

By selecting equipment that complies with IEC standards and partnering with an experienced manufacturer, project owners can improve system reliability, simplify maintenance, and support the long-term operation of their electrical infrastructure.

Guangdong Haocheng Electric is committed to delivering reliable, customized 24kV metal-clad switchgear solutions backed by strong engineering expertise, advanced manufacturing capabilities, and practical export experience in the Indonesian market.