Detailed information about the ZGS series combined substation (American-type substation)

1. Product Introduction

The combined substationZGS series (American-type substation) is an integrated, fully sealed, and fully insulated power supply equipment, specially designed for compact outdoor power distribution in accordance with international standards GB/T 17467-2018 and IEC 62271-200. In this product, the high-voltage switch unit, transformer unit, and low-voltage distribution unit are combined into a single sealed structure with a corrugated oil tank, eliminating the need for a traditional separate cabinet and achieving miniaturization, integration, and maintenance-free operation.

Compared to traditional civil substations and European box-type substations, the American ZGS box-type substation has significant advantages such as smaller footprint, faster installation, more reliable protection, lower cost, higher overload capacity, and longer service life. It can be directly used in various distribution network modes, such as terminal power supply, ring network power supply, and dual-channel power supply.

The entire equipment system has a fully sealed enclosure with oil cooling and anti-corrosion metal coating, allowing it to operate outdoors for extended periods without the need to build a distribution panel. The system can be activated after lifting and on-site connection. It is particularly suitable for the renovation of old urban areas, power supply for industrial parks, temporary power supply for construction sites, grid connection of new energy sources, rural power grid upgrades, and other scenarios. With high reliability, minimal operation and maintenance costs, and ultra-high economic efficiency, the ZGS system has become the main solution for compact, economical, and fast power supply in the construction of new generations of urban and rural power grids.

2. Technical parameters(customizable)

2.1 Standard electrical parameters

• Rated voltage: HV 10 kV (6 kV, 35 kV customizable); LV 0.4 kV

• Rated power: 50, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000 kVA

• Transformer type : sealedoil-immersed transformer

• Energy efficiency class: S13, S20, S22 (Level 1 / Level 2)

• High voltage system:

• Switch type: two-position/three-position oil-immersed load break switch.

• Protection scheme: Plug-in dual-sensing fuse + backup current-limiting fuse

• Incoming line mode: Fully insulated, pluggable live elbow cable connector.

• Power supply mode: Terminal power supply / Ring network power supply

• Low-voltage system:

• Incoming line: Molded Case Circuit Breaker (MCCB)

• Outgoing line: 4–12 lines (configurable)

• Functional configuration: energy consumption metering, reactive power compensation, lightning protection, leakage current protection, intelligent monitoring.

• Connection group: D,yn11

• Short-circuit impedance: 4–6% (depending on power)

• Protection degree: IP54

• Ambient temperature: -40℃ to +45℃

• Allowable altitude: ≤3000 m

• Relative humidity: ≤95% (non-condensing)

• Enclosure material: cold-rolled steel plate with spray coating / corrosion-resistant 304 stainless steel

• Installation method: floor-mounted, pole-mounted, foundation-mounted

3. Main Features

High-voltage and low-voltage components and the transformer are integrated into a single unit, with a volume only 1/3 to 1/5 of that of a European box-type substation. The compact design and low profile allow direct installation in narrow spaces such as roadsides, green areas, public corners, and construction site edges.

Fully sealed and fully insulated, with a high level of safety.

All high-voltage current-carrying components are immersed in transformer oil, with no exposed current-carrying components, eliminating the risk of electric shock, accidental contact, and arcing. Operation is safe and simple.

Dual fuses provide comprehensive protection, ensuring stable and reliable operation.

It uses a plug-in thermal fuse + current-sensitive dual-sensor fuse + backup current-limiting fuse for dual protection, covering all fault ranges such as overload, short circuit, and overheating. It offers advantages such as sensitive tripping, low failure rate, and no need for complex maintenance.

Ultra-high overload capacity, suitable for peak loads.

The natural heat dissipation design, immersed in oil, has much higher heat dissipation efficiency than dry-type/European box-type substations.

Hermetically sealed structure, truly maintenance-free.

It adopts a self-expanding corrugated oil tank design, with no storage tanks, sealing covers, or leaks, and the interior is completely isolated from air, preventing water ingress, condensation, and oxidation.

Exceptional environmental adaptability, resistant to weather conditions and corrosion.

The entire machine is waterproof, dustproof, corrosion-resistant, anti-condensation, and resistant to salt spray and acid-alkali corrosion.

Low noise, minimal losses, environmentally friendly

It uses oriented silicon steel sheets with high magnetic permeability as the core, featuring characteristics such as low excitation and low noise.

4. Application scenarios

1. Urban residential complexes, renovation of old residential areas

Small footprint, simple appearance, low noise level, ability to integrate into the landscape of a residential complex, and stable and reliable power supply.

Suitable for outdoor power supply in industrial parks, factories, and enterprises.

High overload capacity, high protection level, suitable for operation under high loads, continuous production, and harsh environmental conditions.

Providing temporary power supply for construction sites, mines, and temporary buildings.

Examples of outdoor power supply scenarios such as road lighting, parks, scenic spots, squares, sewage treatment plants, waste transfer stations, airports, high-speed railway stations, and subway stations, etc.

New energy sources (photovoltaic energy, wind energy, energy storage systems)

Suitable for outdoor use in desert and mountainous areas, as well as rooftop photovoltaic projects, compact in size, resistant to sand and dust, highly weather-resistant, and can be used as step-up/distribution equipment connected to the grid.

Rural power grids, mountainous areas, and remote regions

Easy to install, low maintenance costs, high reliability, suitable for distributed loads, long-distance power supply, and unmanned power supply in rural areas, livestock farming, and irrigation.

Coastal areas, chemically hazardous zones, and areas with high corrosive activity

Stainless steel casing with anti-corrosion coating, resistant to salt spray, corrosion, waterproof and moisture-proof, with a service life significantly exceeding that of ordinary box-type substations.