YB Prefabricated Substation

Overview

The YB prefabricated substation is a compact, complete switchgear assembly pre-installed within a single enclosure, integrating high-voltage distribution equipment rated at 12kV, a 12/0.4kV power transformer, low-voltage distribution systems, and energy metering devices.

The YB prefabricated substation is primarily designed for use in three-phase AC power systems with a rated frequency of 50 Hz and a rated voltage of 6–12/0.4 kV, serving as a reliable source of power and lighting. It is particularly well-suited for retrofitting distribution lines along roads in urban networks, as well as ideal for applications in residential communities, streets, large construction sites, high-rise buildings, industrial and mining enterprises, and temporary facilities.

This product complies with GB/T 17467 "High-Voltage/Low-Voltage Prefabricated Substations" and IEC 601330 "High-Voltage/Low-Voltage Prefabricated Substations."

Model and Its Meaning

Structural Features

Its key features include a compact structure, small size, high overall strength, and convenient transportation and installation.

The base of the 2-kV switchgear unit features a channel-steel welded structure. Above the base, components such as side panels, ring beams, partitions, doors, and the roof cover are assembled either through spot welding or bolted connections. The enclosure itself is constructed from steel plates, with special attention paid to ensuring the structural steel parts have excellent corrosion resistance. The plate thickness is no less than 3 mm, and reinforced ribs are strategically placed at vulnerable areas to provide sufficient mechanical strength, preventing deformation or damage during lifting, transportation, and installation. All sealing areas are designed for reliable performance, achieving a protection rating of at least IP33. Additionally, there are no exposed, removable bolts visible on the exterior of the enclosure (excluding the foundation), and natural ventilation is employed—ventilation holes are incorporated into the door panels and upper ring beam—to ensure that, under normal ambient temperatures, the operating temperatures of all electrical equipment remain below their maximum permissible limits. The roof cover also features a slope greater than 5% to prevent water accumulation.

3 The high-voltage room can be equipped with SF6 gas-insulated ring main units produced by the company, featuring built-in fuses, or with metering cabinets, or with 10kV sulfur hexafluoride high-voltage switchgear (this series of switchgear boasts compact size, maintenance-free operation, simple handling, high safety, and excellent cost-effectiveness).

The transformer room is equipped with fully sealed, oil-immersed, self-cooled transformers of the S9 model or higher. The transformer casing features a pressure-relief device, and an oil collection tray is installed at the bottom—capable of holding the transformer's full capacity—to prevent oil leakage in case of an accident.

5. The transformer room can accommodate fully sealed oil-immersed power transformers or dry-type transformers with a capacity of up to 1000 kVA and a voltage rating of 12/0.4 kV.

The low-voltage room is equipped with components such as AC contactors specifically designed for capacitors and flame-retardant wiring terminal blocks. Additionally, the low-voltage room features no exposed conductors, and the low-voltage busbar is externally coated with heat-shrinkable material to ensure safety and reliability. Moreover, the low-voltage room can be customized according to various customer requirements and can even accommodate automatic reactive power compensation devices.

7 The high-voltage chamber is connected to the transformer using a sealed joint, with incoming and outgoing cables arranged horizontally in a three-phase configuration. Each circuit is equipped with cable termination accessories of the appropriate specifications (including three-phase branch gloves and right-angle boot-type insulating covers), while the low-voltage cable copper connectors have been tinned.

Main technical specifications

Floor plan layout and overall dimensions

1 Flat-lying "Eye"-shaped substation: Overall dimensions and layout configuration

2 Laid-out dimensions and plan layout of the "pin" -shaped substation

Normal operating conditions

1 Ambient air temperature not exceeding 40°C, with a 24-hour average no higher than 35°C, and a minimum ambient air temperature of -25°C;

2 Altitude not exceeding 1000m;

3 The surrounding air is free from significant contamination by dust, smoke, corrosive or flammable gases, vapors, or salt spray;

4 Relative Humidity: The average relative humidity measured over 24 hours shall not exceed 95%, and the average water vapor pressure measured over 24 hours shall not surpass 2.2 kPa. Additionally, the monthly average relative humidity should remain below 90%, while the monthly average water vapor pressure should stay under 1.8 kPa.

5. During equipment installation, the tilt angle relative to the vertical plane should not exceed 3°.

6. The equipment should be installed in a location free from severe vibrations and shocks.

Note: Users with special requirements may discuss solutions directly with our company.