1000 kVA Compact Substation: Specifications, Structure, and Applications

Time：2026-02-4    Auther：ZTelec-www.ztelectransformer.com

The 1000 kVA compact substation is widely used in modern medium-voltage power distribution systems. With the expansion of urban grids, renewable energy projects, and industrial electricity demand, compact substations have become a preferred alternative to traditional civil substations.

Thanks to their integrated design, small footprint, and fast installation, 1000 kVA compact substations are especially suitable for locations where space, construction time, and operational reliability are critical.

What Is a 1000 kVA Compact Substation?

A 1000 kVA compact substation is a prefabricated power distribution unit that integrates medium-voltage switchgear, a distribution transformer, and low-voltage distribution equipment into one enclosed structure.

It is mainly used to step down medium voltage, such as 10 kV, 11 kV, or 33 kV, to a low-voltage level of 0.4 kV for end users.

Compared with conventional substations, compact substations require significantly less land, are factory-assembled, and can be installed and commissioned in a much shorter time.

Technical Specifications of a 1000 kVA Compact Substation

Electrical Parameters

The rated capacity is 1000 kVA and can be adjusted based on project requirements. The primary voltage typically ranges from 10 kV to 35 kV, depending on local grid standards. The secondary voltage is usually 400 V or 230 V.

Both 50 Hz and 60 Hz systems are supported. The short-circuit withstand capacity commonly ranges from 16 kA to 25 kA for one second. Medium-voltage insulation may be oil-based or gas-insulated, such as SF6.

Physical Characteristics

A typical 1000 kVA compact substation has a length of about 2.5 to 3.5 meters, a width of 1.5 to 2.2 meters, and a height of 2.0 to 2.5 meters. Exact dimensions depend on internal configuration and equipment selection.

The enclosure is usually made of aluminized zinc steel or stainless steel, providing good resistance to corrosion, moisture, and dust. Protection levels commonly range from IP23 to IP54, allowing safe outdoor operation.

Structural Design Features

Modular Compartment Layout

The substation uses a modular structure divided into functional compartments. The high-voltage compartment contains load switches, fuses, surge arresters, and voltage indicators.

The transformer compartment houses a 1000 kVA oil-immersed or dry-type transformer, along with temperature monitoring and ventilation systems.

The low-voltage compartment includes circuit breakers, metering devices, protection relays, and optional reactive power compensation equipment. Intelligent monitoring systems can be added for real-time data collection.

Safety and Protection Design

To ensure operational safety, the substation is equipped with interlocking mechanisms that prevent incorrect switching operations. Fire-resistant materials and internal partitions improve fire protection.

The transformer compartment includes pressure relief and ventilation channels. A complete grounding system protects both personnel and equipment during normal operation and fault conditions.

Compact and Integrated Construction

By integrating all major components into a single enclosure, the footprint is reduced by approximately 40 to 60 percent compared with traditional substations.

Pre-installed cable routes and connectors simplify on-site installation and significantly reduce construction time.

Typical Application Scenarios

Urban Distribution and Commercial Buildings

1000 kVA compact substations are widely used in shopping centers, office buildings, hospitals, and schools. Their compact size, low noise level, and flexible enclosure design meet urban requirements for space efficiency and appearance.

Industrial Parks and Manufacturing Plants

In industrial environments, these substations serve as main distribution units for factories and production lines. Oil-immersed transformers combined with high-capacity low-voltage systems are commonly selected for continuous heavy-load operation.

Renewable Energy Projects

Compact substations are commonly applied in photovoltaic step-up stations, wind farms, and energy storage systems. Their modular design supports rapid installation and future capacity expansion.

Infrastructure and Outdoor Installations

They are also suitable for highways, railways, mining sites, and oil and gas projects. Customized designs are available for high-temperature, dusty, or humid environments.

Selection and Procurement Considerations

When selecting a 1000 kVA compact substation, it is important to evaluate voltage levels, short-circuit capacity, and load characteristics. Environmental conditions such as temperature, humidity, and altitude should also be considered.

The substation should comply with local grid regulations and international standards such as IEC. For export projects, switchgear brands, insulation classes, and test reports must be clearly specified.

The 1000 kVA compact substation is a reliable and space-saving solution for medium-voltage power distribution. With proper selection, professional installation, and routine maintenance, it can provide stable and long-term operation.

If you need support for project planning, customized configurations, or technical consultation, please contact us for professional assistance.