广西Underground Prefabricated Substation

Underground Prefabricated Substation (Landscape-Type Underground Transformer Substation)

Overview

The Underground Prefabricated Substation, also known as the Landscape-Type Underground Transformer Substation, is an innovative solution designed for all-weather outdoor operation with a maintenance-free system. It features a low-loss, low-temperature-rise, low-noise, low-radiation, compact, high-corrosion-resistant, fully sealed, and submersible underground transformer. This includes tunnel transformers and underground utility corridor transformers, integrated with a complete high/low voltage control system and a customizable thin-profile landscape-type outdoor enclosure with multimedia capabilities.

This product is composed of two main parts:

• Underground section: A high-protection-level underground transformer and underground transformer chamber.

• Above-ground section: High/low voltage switchgear and an anti-corrosion landscape enclosure.

It is widely used in modern urban environments where visual integration, compactness, and performance are required. The transformer capacity ranges from 30 kVA to 1600 kVA, making the product highly versatile and fully standardized.

Operating Conditions

• Altitude: ≤1000m for high voltage; ≤2000m for low voltage

• Ambient temperature:

  • Max temperature: +40°C

  • Min temperature: -45°C

  • Max monthly average: +30°C

  • Max yearly average: +20°C

• Installation site:

  • Free from explosive, corrosive liquids, gases, or dust

  • No violent vibration or impact

  • Allows partial or full submersion in water for certain periods

• Seismic tolerance (ground acceleration):

  • Horizontal ≤ 3 m/s²

  • Vertical ≤ 1.5 m/s²

• Power waveform: Approximate sine wave

• Power symmetry: For three-phase units, voltages should be approximately symmetrical

• ★ Special customized versions available for extreme environmental conditions

Applicable Standards

• GB 311.1-1997: Insulation coordination for high-voltage transmission equipment

• GB/T 2900.1, 2900.20: Electrotechnical terminology

• GB 3906-1991: 3–35kV AC metal-enclosed switchgear

• GB 4208-1993: Ingress protection rating (IP code)

• GB/T 7251.1-2005: Low-voltage switchgear and controlgear assemblies

• GB/T 10233-2005: Basic testing methods for LV equipment

• GB/T 11022-1999: Common technical requirements for high-voltage switchgear

• GB/T 17467-2010: HV/LV prefabricated substations

• GB/T 16927.1-1997: General requirements for high-voltage test techniques

• GB/T 16935.1-1997: Insulation coordination for low-voltage systems

• JB/T 10544-2006: Underground transformers