Operating Conditions

• Altitude not exceeding 1000m.

• Ambient temperature: -35°C to +40°C.

• Relative humidity: Daily average ≤ 95%, monthly average ≤ 90%.

• Installation site: Places without fire or explosion hazards, free from chemically corrosive gases, with good ventilation, and with a ground inclination angle not exceeding 3°.

Structural Features

• Compact structure and small volume, approximately only 1/3 to 1/5 the size of European-style box substations of equivalent capacity, significantly reducing the footprint.

• Fully sealed and fully insulated structure, requiring no insulation clearance, reliably ensuring personnel safety.

• High-voltage side utilizes load switch-fuse combination for protection.

• High-voltage wiring is suitable for both ring main and terminal connections, offering flexible power supply modes and high reliability.

• Excellent transformer performance: Low loss, low noise, low temperature rise; strong overload capacity, excellent short-circuit and impact resistance.

• Meets various low-voltage feeder requirements; can be selected based on standard schemes or custom-designed.

• The cable connectors are available in two types: a 200A elbow-type cable connector and a 600A T-type connector. Both can be equipped with fully insulated zinc oxide lightning arresters. The 200A elbow-type cable connector can be plugged and unplugged under load and can also function as an isolating switch.

Split-Tank Structure Features

• The substation adopts a split-tank structure:

  • The transformer core and high-voltage components (such as the load switch, plug-in fuses, and backup current-limiting fuses) are housed in separate sealed oil tanks.

  • The two tanks are arranged horizontally side-by-side, completely separated by a partition.

  • Insulated wall bushings on the partition are used for connecting the transformer to the load switch, allowing easy disassembly and replacement without affecting the other tank.

• Advantages of the side-by-side tank arrangement:

  • Prevents oil from the upper tank flowing into the lower tank due to partition leakage, which could cause oil shortage in the upper tank (potentially leading to arcing during load switch operation, endangering equipment and personnel).

  • Another advantage is easier maintenance. When maintaining the transformer tank or the load switch tank, the two work independently without interference, making the process convenient and fast (In a vertical arrangement, maintaining the transformer requires dismantling the entire upper tank first, which is extremely inconvenient).

• The split-tank structure solves the problem of transformer oil contamination caused by load switch operation and fuse blowing.