YB Type-12/0.4 Prefabricated Substation

　　The YB□-12/0.4 combined prefabricated substation is a compact, complete switchgear assembly that integrates high-voltage electrical equipment, transformers, low-voltage electrical equipment, and other components into a single unit. It is suitable for use in urban high-rise buildings, luxury villas, plazas and parks, residential communities, high-tech development zones, small and medium-sized factories, mining and oilfield sites, as well as temporary construction power supply systems. In AC 50Hz (60Hz) distribution systems with rated voltages ranging from 7.2 to 12/0.4kV, this substation is designed for receiving and distributing electrical energy.

　　The YB□-12/0.4 combined prefabricated substation features strong completeness, compact size, a streamlined structure, safe and reliable operation, convenient maintenance, and mobility. Compared with conventional civil-engineering substations, a packaged substation of the same capacity occupies only 1/10 to 1/5 of the land area required by a conventional substation, significantly reducing both design and construction efforts as well as capital costs. In distribution systems, this substation can be used in ring-network distribution systems, as well as in dual-power or radial-terminal distribution systems. It is a new type of complete equipment currently being widely adopted for the construction and renovation of substations in both urban and rural areas.

　　This product complies with GB/T17467 “High-Voltage/Low-Voltage Prefabricated Substations” and IEC601330 “High-Voltage/Low-Voltage Prefabricated Substations.”

　　 Main Technical Parameters

　　 Normal operating conditions

　　1. The ambient air temperature shall not exceed 40℃, and the average value measured over a 24-hour period shall not exceed 35℃; the minimum ambient air temperature shall be -25℃.

　　2. Altitude not exceeding 1000 m;

　　3. The surrounding air is not noticeably contaminated 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%; the average vapor pressure measured over 24 hours shall not exceed 2.2 kPa; and the monthly average relative humidity shall not exceed.

　　90%, the monthly average vapor pressure does not exceed 1.8 kPa;

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

　　6. The equipment should be installed in a location free from severe vibration and impact.

　　Note: If users have special requirements, they may negotiate with our company to find a solution.

　　 Structural features

　　1. This product consists of a high-voltage switchgear, a transformer, and a low-voltage switchgear connected together, and is divided into three functional compartments: the high-voltage compartment, the transformer compartment, and the low-voltage compartment. Both the high- and low-voltage compartments are fully equipped with all necessary functions. The primary power supply system on the high-voltage side can be configured in various ways, including ring network supply, terminal supply, and dual-power supply. Additionally, high-voltage metering components can be installed to meet high-voltage metering requirements. The transformer compartment can accommodate S7, S9, and other low-loss oil-immersed transformers as well as dry-type transformers. The transformer compartment is equipped with an automatic forced-air cooling system and an illumination system. The low-voltage compartment, according to user requirements, can adopt either panel-mounted or cabinet-mounted structures to form the power supply solution tailored to the user’s needs. It offers multiple functions, including power distribution, lighting distribution, reactive power compensation, electrical energy metering, and electricity measurement, thereby meeting diverse user requirements and facilitating power supply management while enhancing power supply quality.

　　2. The high- and low-voltage rooms are arranged in a reasonable and compact manner, making operation and maintenance convenient. The high-voltage switchgear is equipped with interlocking mechanisms to prevent erroneous operations. According to user requirements, the transformer can be easily moved in and out of the transformer room door via a rail system, and the transformer room door is fitted with a labyrinth-type ventilation device. Each room is equipped with an automatic lighting system. Moreover, the components selected for the high- and low-voltage switchgear feature reliable performance, simple operation, and easy maintenance. The substation’s roof adopts a double-layer insulation structure to reduce the effects of solar radiation and facilitate ventilation and heat dissipation. The base is made of a structural steel frame that provides sufficient strength and rigidity.

　　3. Both natural ventilation and forced ventilation methods are employed to ensure excellent ventilation and cooling performance. The transformer room is equipped with a temperature sensor that can automatically regulate the transformer's temperature, guaranteeing its full-load operation.

　　4. Substation enclosures are categorized into steel-plate, aluminum-alloy, and non-metallic types. Each enclosure structure consists of three main components: a base, a frame, and a roof cover. Inside the enclosure, there are separate compartments for high-voltage equipment, transformer room, and low-voltage equipment. The base is welded from channel steel, providing high overall strength and serving as the foundational component for securing the frame and internal electrical equipment. The frame is composed of bent parts made from channel steel, angle steel, and thin steel plates, which are joined together by welding or fasteners. The doors and exterior walls are made of steel plates, composite panels, or aluminum alloys, while the interior walls are constructed from steel plates or gypsum boards. The substation enclosure is equipped with ventilation, thermal insulation, and dust-filtering devices. Additionally, temperature monitoring systems and automatic ventilation and cooling devices can be installed as needed.

　　5. The substation is equipped with mechanical or electrical interlocks, meets the “Five-Prevention” requirements, and features comprehensive monitoring, control, and protection measures.

　　6. If electric operation is adopted, a power supply can be provided locally and the system can be used in conjunction with the FTU system to meet the automation requirements of distribution network systems.

　　7. Depending on the specific application environment and operating conditions, different structural designs and materials can be selected to meet various usage requirements and ensure the normal operation of the substation. The substation enclosure can be made from non-metallic construction materials, ordinary steel plates, stainless steel plates, aluminum alloy plates, color-coated composite panels, and other similar materials. After undergoing partial or complete surface treatments, these enclosures are suitable for long-term outdoor use, ensuring excellent corrosion resistance, waterproofing, and dustproof performance, with a long service life and an aesthetically pleasing appearance. The basic structural forms can be broadly categorized as follows:

　　7.1 Prefabricated substations using non-metallic building materials or other materials;

　　7.2 General-type packaged substations using ordinary steel plates;

　　7.3 High-corrosion-resistant box-type substations made of stainless steel plates or aluminum alloy plates;

　　7.4 Insulated and heat-insulated box-type substation using color steel composite panels:

　　7.5 Other structural types of packaged substations.

　　8. The cable entry and exit method is generally via cables. If there are special requirements, other entry and exit methods may be used.