DBW1-12 Underground Substation
Category:
Box-type substation
Keywords:
DBW1-12 Underground Substation
The DBW1 series underground substation is a new type of packaged substation designed for the renovation and construction of urban power grids. This product features a small footprint, low profile, zero noise, and high power supply reliability, and is equipped with distribution network automation terminal units (FTUs) as well as automatic drainage and ventilation systems. Its performance complies with the requirements of GB 17467, “High-Voltage/Low-Voltage Prefabricated Substations.”
The DBW1 series underground substation is an independent, complete AC 6–10 kV switchgear and distribution unit with a rated frequency of 50 Hz and a rated capacity ranging from 50 to 500 kVA. It can be used as a public utility substation or a streetlight transformer and is widely deployed in scenic areas, historical sites, and residential communities. This type of substation significantly saves urban land, particularly due to its low ground profile, which does not obstruct sightlines or detract from the landscape, making it ideally suited for installation along sidewalks.
The DBW1 series of underground substations can be used in both ring-network distribution systems and as terminal substations in radial power grids.
Operating Environment Conditions
a. Altitude not exceeding 1000 m;
b. Ambient air temperature: -25°C to +40°C;
c. Outdoor wind speed shall not exceed 35 m/s;
d. Relative air humidity shall not exceed 90% (+25°C);
e. Installation Location: The equipment shall be installed in a location free from fire hazards, explosion risks, chemical corrosion, and severe vibration.
| Serial Number | Project | Unit | Parameters |
| 1 | Rated voltage | kilovolt | 12 |
| 2 | Rated frequency | Hertz | 50 |
| 3 | Rated current of load switch | A | 630 |
| 4 | Thermal stability current of the main circuit (RMS) | kA | 20 |
| 5 | Main circuit dynamic stability current (peak) | kA | 50 |
| 6 | Rated making current (peak) of the main circuit | kA | 50 |
| 7 | Rated Active Load Interrupting Current | A | 630 |
| 8 | Rated Closed-Loop Breaking Current | A | 630 |
| 9 | 5% rated active-load breaking current | A | 31.5 |
| 10 | Rated cable charging and breaking current | A | 10 |
| 11 | Rated no-load breaking current of the transformer | A | No-load current of a 1600 kVA transformer |
| 12 | Fuse rated breaking current | kA | 31.5 |
| 13 | Rated Transfer Current | A | 1500 |
| 14 | Mechanical life | next | 10000 |
| 15 | 1 min power-frequency withstand voltage to ground, between phases, and across isolation gaps | kilovolt | 42/48 |
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