▎Product Features

The YB27-40.5/6300kVA series of high- and low-voltage prefabricated substations is a new type of prefabricated substation that integrates low-voltage switchgear, a 40.5 kV step-up transformer, high-voltage switchgear, measurement, control, and protection devices—all housed within a single enclosure and assembled according to a specific wiring configuration.
· Suitable for harsh environments such as contamination, salt spray, humidity, and high altitudes; multiple solutions meet even more demanding requirements.
· Rated voltage levels: 40.5 kV / 0.69 kV, 40.5 kV / 0.27 kV
· Transformer rated capacity: 500–6300 kVA
· Online environmental monitoring (temperature, humidity, intrusion, etc.)
· Compatible with all brand protection devices
· Provides a highly integrated, intelligent substation measurement and control system.

▎Operating Environment Conditions

· Altitude: s5000m (Special note required if the device operates at an altitude exceeding 2000m);
·Ambient temperature: Maximum temperature +50℃, minimum temperature -50℃, average value within 24 hours ≤35℃;
·Environmental humidity: Average relative humidity over 24 hours ≤ 95%; average monthly relative humidity ≤ 90%.
·Electromagnetic interference: The amplitude of electromagnetic interference induced in the secondary system ≤ 1.6 kV;
·Installation environment: The surrounding air should be free of explosive and corrosive gases, and the installation location should not experience frequent, severe vibrations or impacts.
·Note: If the operating environment conditions exceed those specified above, please consult with our company to arrange a customized solution.

▎Applicable Standards

· GB/T 17467-2020 High-Voltage/Low-Voltage Prefabricated Substation
· GB/T 1094.1-2013 Power Transformers—Part 1: General Requirements
· GB/T 1094.2-2013 Power Transformers—Part 2: Temperature Rise
· GB/T 1094.3-2017 Power Transformers—Part 3: Insulation Tests, Insulation Coordination, and External Air Clearances
· GB/T 3906-2020 3.6kV~40.5kV AC Metal-Enclosed Switchgear and Control Equipment
· GB/T 11022-2020 Common Technical Requirements for High-Voltage Switchgear and Control Equipment
· GB/T 7251.1-2016 Low-Voltage Switchgear and Controlgear—Part 1: General Rules GB/T 14048.1-2016 Low-Voltage Switchgear and Controlgear—Part 1: General Rules

▎Recycling and Reuse

Qian Gu Power is committed to environmental protection. Its products have been certified under the ISO 14001 international environmental management system and strictly adhere to this standard.
Recycling and Disposal
The design and manufacture of the YB27 substation comply with the national standard GB/T17467. At the end of the product’s lifecycle, it will be recycled and reused in accordance with relevant standards.
Sustainable development
The YB27 substation continuously reduces SF6 emissions during the manufacturing process and does not use SF6 gas during installation.
All products are made from 100% recyclable materials;
Provides self-powered relays and devices to avoid additional energy consumption.

▎Product Parameters

▎Core Components and Accessories

Structural features:
·Welded structure: Made by bending profiled materials and cold-rolled steel sheets, followed by welding and surface treatment. Advantages: sturdy and highly strong.
·Assembly structure: Available materials include steel plates, aluminum alloy plates, stainless steel plates, composite color-coated steel plates, and eco-friendly non-metallic panels. After surface treatment, these materials are assembled. Advantages: Beautiful appearance and flexible assembly.
·Top cover solution: Adopt a double-layer structural design, incorporating elements such as waterproofing, ventilation, and heat dissipation to meet requirements for freeze resistance, UV resistance, and heat dissipation.
·Transformer Room: A dedicated heat dissipation channel is designed. For transformers with capacities below 4,000 kVA, natural ventilation alone can achieve the desired cooling effect. Alternatively, based on the user’s specific conditions and requirements, automatic temperature-control devices can be installed to provide forced cooling and meet the cooling demands.
·Appearance: We can produce products in various colors according to customer requirements, add different patterns, and even offer hand-painted designs, among other options.
 

One-dimensional component selection:
·High-voltage side: The UN3.V-40.5/630-25kA high-voltage switchgear is selected. All live parts are fully enclosed within an SF6-gas-filled enclosure, making it suitable for harsh environments such as salt spray, humidity, pollution, and high altitudes.
· Transformers: Oil-immersed transformers or dry-type transformers can be selected according to user requirements, with capacities ranging from 6300 kVA and below across all series.
·Low-voltage side: Choose cabinet-type circuit breakers with a rated current of up to 6,300 A. Alternatively, you can opt for products in various structural forms, such as digital or panel-mounted designs.