Product Overview

YBM-12 prefabricated substation is a domestically produced American style box transformer. As an important power supply unit in cable based distribution networks, this product is a complete pre installed product that integrates high-voltage control, protection, substation, and distribution equipment. It is widely used in urban and rural distribution networks.

This product places the high-voltage load switch and high-voltage fuse in the transformer oil, and has two structural forms: sharing or splitting with the transformer body. The oil tank adopts a fully sealed structure and is equipped with components such as oil temperature gauge, oil level gauge, pressure gauge, pressure relief valve, oil drain valve, etc. to monitor the operation status of the transformer. This product is divided into ring network type, terminal type, and power supply type. In order to make this product more suitable for the actual requirements of China's power grid, the company has also promoted plug-in dry-type fuses, whose melting does not affect the performance of transformer oil. According to the complexity of low-voltage feed out requirements, YB.12/0.4 products are divided into three types of shell forms: standard, reinforced, and comprehensive, allowing users and design units to achieve more flexibility and economy in selection.

Normal usage conditions

● Environmental temperature: maximum temperature+40 ℃, minimum temperature -30 ℃.

● Altitude: ≤ 1000m.

● Wind speed: equivalent to 34m/s (not exceeding 700pa).

● Humidity: The average daily relative humidity is not greater than 95%, and the average monthly humidity is not greater than 95%.

● Seismic resistance: horizontal acceleration not exceeding 0.4m/s ², vertical acceleration not exceeding 0.15m/s ².

● Installation site inclination: not greater than 3 °.

● Installation environment: The surrounding air is not significantly polluted by corrosive or flammable gases, and there is no severe vibration at the installation site.

● When ordering this product beyond the above conditions, you can negotiate with our company.

Model and its meaning

Product advantages

● Compact structure, with a volume only about 1/3 to 1/5 that of domestic European box transformers of the same capacity, greatly reducing the footprint.

● Fully sealed, fully insulated structure, no insulation distance required, reliable protection of personal safety.

● High voltage wiring can be used for both ring networks and terminals, with flexible power supply and high reliability.

● Excellent performance of the transformer: low loss, low noise, low temperature rise; Strong overload capacity, short circuit resistance, and strong impact resistance.

● Meet various low-voltage feed out requirements, can be selected according to the plan, or can be designed by oneself.

● There are two types of cable heads: 200A hour type plugs and 600A "" type fixed cable joints, both of which can be equipped with fully insulated zinc oxide lightning arresters. 200A type cables can be plugged and unplugged with load, and can also serve as limit switches.

Internal structure

Rated parameters of the product

Rated voltage: 10KV/0.4KV

High voltage side rated voltage: 10KV

High voltage side maximum voltage: 12KV

Low voltage side rated voltage: 0.4KV

Rated frequency: 50Hz

High voltage switch thermal stability capacity: 20KZ/26

Rated short-circuit breaking capacity of low-voltage main circuit switch: 35KA

Rated short-circuit breaking capacity of low-voltage distribution circuit switch: 35KA

Transfer current of high-voltage load switch:>1500A

Noise level:<50dB

Box shell protection level: not less than IP3X

insulation level

Structural characteristics

● The box shell skeleton structure is made of channel steel and angle steel, with high mechanical strength. The outer shell is made of materials such as aluminum alloy plate, with a smooth and flat surface. The product is beautiful and elegant, and has good anti-corrosion performance. The base of the box is 300-600mm higher than the foundation.

● All doors of the cabinet shell open outward at an angle greater than 90 ° and are equipped with positioning devices. And equipped with handles, hidden doors, and hidden locks that can prevent rain, blockage, and rust. The boxes are all fully sealed anti-theft structures; To ensure that the temperature of all electrical equipment does not exceed its maximum allowable temperature when operating at normal ambient air temperatures, the enclosure does not have sufficient natural ventilation openings and insulation measures.

● The box of the prefabricated substation is equipped with a dedicated grounding conductor, which has fixed connection terminals connected to the grounding grid. There are at least two of them with obvious grounding marks. The grounding terminal shall be a copper bolt with a diameter of not less than 12mm. The grounding conductor adopts steel strip, with a current density of not more than 200A/mm2 and a cross-sectional area of not less than 30mm2, and ensures that no overheating or impact on the safety of surrounding objects occurs when the maximum short-circuit current flows. The movement borne by the dedicated grounding conductor. The thermal stability current should be coordinated with the grounding method of the high-voltage distribution equipment.

Transformer performance parameters

Note: a. According to customer requirements, the high-voltage tap range of the transformer can be designed to be ± 2X2.5%. b. According to customer requirements, the low voltage of the transformer can be designed as 0.69KV.