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

1. Introduction to the product

CombinedsubstationZGS series (American type substation) is an integrated, fully sealed and fully isolated 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 switching unit,transformerThe unit and low-voltage distribution block are combined into a single sealed structure with a corrugated oil tank, eliminating the need for a traditional separate cabinet and ensuring miniaturization, integration and maintenance-free operation.

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

The entire system is fully sealed in an oil-cooled enclosure with a corrosion-resistant metal coating, allowing it to operate outdoors for extended periods without the need for a switchboard. The system can be turned on after being erected and connected on-site. It is particularly suitable for the renovation of older urban areas, powering industrial parks, providing temporary power to construction sites, connecting new energy sources to grids, upgrading rural power grids, and other applications. Due to its high reliability, minimal operating and maintenance costs, and exceptional economic efficiency, the ZGS system has become the primary solution for compact, cost-effective, and fast power supply in the construction of new generation urban and rural power grids.

2. Technical parameters(customizable)

2.1 Standard electrical parameters

• Nominal voltage: HV 10 kV (6 kV, 35 kV on request); 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: hermetically sealedoil transformer

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

• High voltage system:

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

• Protection Scheme: Plug-in dual-sensitivity fuse + backup current-limiting fuse

• Incoming Line Mode: Fully insulated, pluggable, right angle cable connector under voltage.

• Power supply mode: Powered by terminal / Powered by ring network

• Low voltage system:

• Incoming line: Molded case circuit breaker (MCCB)

• Outgoing line: 4-12 lines (customizable)

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

• Connection group: D,yn11

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

• Protection class: IP54

• Ambient temperature: from -40℃ to +45℃

• Permissible altitude: ≤3000 m

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

• Body material: cold rolled steel plate with spray coating / 304 stainless steel, corrosion resistant.

• Installation method: floor-standing, on a support, with fastening to the foundation.

3. Main characteristics

The high-voltage and low-voltage components, as well as the transformer, are combined in a single unit, which is only 1/3–1/5 the volume of a European box-type substation. Its compact design and low profile allow it to be installed directly in tight spaces, such as roadsides, green spaces, public spaces, and the edges of construction sites.

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

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

Double fuses provide comprehensive protection, stable and reliable operation.

It utilizes a plug-in thermal fuse, a current-sensitive dual-sensor fuse, and a backup current-limiting fuse for dual protection, covering all fault conditions, such as overload, short circuit, and overheating. It offers the advantages of sensitive response, low failure rate, and low maintenance.

Ultra-high overload capacity, suitable for peak loads.

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

Sealed design, truly maintenance free.

It uses a self-expanding corrugated oil tank design, no storage tanks, sealing caps or leaks, with the interior completely sealed from the air, no water ingress, condensation or oxidation.

Exceptional adaptability to the environment, resistance to weather conditions and corrosion.

The whole machine has waterproof, dustproof, anti-corrosion, anti-condensation, anti-salt fog and anti-acid corrosion properties.

Low noise level, minimal losses, environmentally friendly

The core is made of oriented silicon steel sheets with high magnetic permeability, which has characteristics such as low excitation level and low noise level.

4. Application scenarios

1. Urban residential complexes, reconstruction 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 heavy loads, continuous production and harsh environmental conditions.

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

Examples of outdoor power supply scenarios include road lighting, parks, scenic spots, squares, wastewater treatment plants, waste transfer stations, airports, high-speed rail and metro stations, etc.

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

Suitable for outdoor, desert and mountainous areas and rooftop PV projects, it is small in size, sand and dust resistant, highly weather resistant and can be used as grid-connected step-up/distribution devices.

Rural power grids, mountainous areas and remote regions

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

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

The stainless steel housing with anti-corrosion coating is resistant to salt fog, corrosion, waterproof and moisture-proof, the service life is much longer than that of conventional box-type substations.