Overview
This product is developed by absorbing the latest advanced foreign technology and combining it with domestic actual conditions. The entire product features small size, easy installation and maintenance, low noise, low loss, anti-theft, strong overload capacity, and full protection. It is suitable for newly built residential areas, green belts, parks, stations, hotels, construction sites, airports, and other locations.
The ZGS series prefabricated box-type substation (American style) is suitable for 10kV ring network power supply, dual power supply, or terminal power supply systems, serving as transformation, metering, compensation control, and protection equipment.
This product complies with the following standards:
GB/T17467-1998 "High-voltage/Low-voltage Prefabricated Substation"
DL/T537-93 "Technical Conditions for Ordering 6-35kV Box-Type Substations"
Functions and Features
◆ Fully insulated, fully sealed, minimal maintenance, ensuring personal safety;
◆ Compact structure, volume only 1/3-1/5 of a European-style substation of the same capacity, with low height;
◆ Split-box structure can be adopted to avoid oil contamination in the transformer oil tank;
◆ High-voltage side adopts dual-fuse full-range protection, greatly reducing costs;
◆ Can be used for ring network or terminal; cable heads can be emergently plugged and unplugged at 200A load current;
◆ The enclosure adopts honeycomb double-sandwich composite panels, providing both thermal insulation and heat dissipation;
◆ Electronic phase-loss protector installed on the low-voltage side; when abnormal voltage occurs in the system, it can quickly disconnect the main incoming switch;
◆ High-voltage side oil-immersed load switch or SF6 load switch, with electric upgrade capability, laying the foundation for distribution network automation;
◆ Adopts oil-immersed S9 or higher-performance S11 series transformers.
Normal Operating Conditions
◆ Altitude not exceeding 1000m;
◆ Ambient temperature: -35℃～+40℃;
◆ Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90%;
◆ Installation site: locations free from fire, explosion hazards, chemical corrosive gases, and well-ventilated, with ground inclination not exceeding 3°.
Transformer
The intelligent integrated substation adopts low-loss, oil-immersed, fully sealed S9, S10, S11 series transformers, or alternatively resin-insulated or NOMEX paper-insulated environmentally friendly dry-type transformers. A trolley can be provided at the bottom for convenient transformer access.
Main Technical Parameters
Technical Parameters Table of Prefabricated Substation
| No. | Name | Unit | Technical Parameters |
| 1 | Rated voltage | kV | 10/0.4 (HV/LV) |
| 2 | Maximum operating voltage | kV | 12 (HV side) |
| 3 | Rated frequency | Hz | 50 |
| 4 | Rated capacity | kVA | 50-1600 |
| 5 | 1-minute power frequency withstand voltage | kV | 35 |
| 6 | Lightning impulse voltage | kV | 75 |
| 7 | Cooling method | Oil-immersed self-cooling | |
| 8 | HV fuse breaking current | kA | 50 |
| 9 | Plug-in fuse breaking current | kA | 2.5 |
| 10 | Ambient temperature | ℃ | -35～+40 |
| 11 | Coil allowable temperature rise | ℃ | 65 |
| 12 | No-load tap changing | ±5% or ±2×2.5% | |
| 13 | Noise level | db | 50 |
| 14 | Protection degree | IP43 |
Load Switch Technical Parameters Table
The load switch is oil-immersed, three-phase linked, with spring operating mechanism; it can perform on-load opening and closing operations, and its opening/closing speed is independent of the operating force. Types available include two-position, four-position T-type, four-position V-type, etc.
| No. | Name | Unit | Four-position ring network load switch | Two-position load switch | |
| 1 | Rated current | A | 630 | 315 | |
| 2 | Rated short-circuit making current | kA | 31.5 | 31.5 | |
| 3 | Rated short-time withstand current | kA | 12.5 | 12.5 | |
| 4 | Rated short-time withstand time | S | 2 | 2 | |
| 5 | Mechanical life | operations | 2000 | 2000 | |
| 6 | Lightning impulse withstand voltage peak full wave | Phase-to-phase and phase-to-ground | kV | 75 | 75 |
| 7 | Isolating gap | 85 | 85 | ||
| 8 | 1min power frequency withstand voltage | Phase-to-phase and phase-to-ground | kV | 42 | 42 |
| 9 | Isolating gap | 48 | 48 | ||
| 10 | Rated peak withstand current | kA | 31.5 | 31.5 | |
Transformer Technical Parameters Table
Adopts new S9 series transformer body, featuring low loss, good overload capacity, strong short-circuit resistance; all fasteners are treated with anti-loosening measures, no core lifting required; S10 and S11 series transformers with better performance are also available.
| Capacity KVA |
Voltage kV | Connection group designation |
No-load current % | No-load loss KW | Impedance voltage % |
Load loss W | |||||||
| HV | LV | S9 | S10 | S11 | S9 | S10 | S11 | S9 | S10 | S11 | |||
| 50 | 10±5% or ±2×2.5% |
0.4 | Dyn11 or Yyn0 |
2.0 | 1.9 | 0.75 | 0.17 | 0.15 | 0.12 | 4.0 | 0.87 | 0.83 | 0.87 |
| 63 | 1.9 | 1.8 | 0.7 | 0.2 | 0.18 | 0.14 | 1.04 | 0.99 | 1.04 | ||||
| 80 | 1.9 | 1.7 | 0.7 | 0.25 | 0.22 | 0.175 | 1.25 | 1.2 | 1.25 | ||||
| 100 | 1.8 | 1.55 | 0.65 | 0.29 | 0.26 | 0.2 | 1.5 | 1.42 | 1.5 | ||||
| 125 | 1.7 | 1.45 | 0.65 | 0.34 | 0.3 | 0.235 | 1.8 | 1.72 | 1.8 | ||||
| 160 | 1.6 | 1.3 | 0.6 | 0.4 | 0.36 | 0.27 | 2.2 | 2.12 | 2.2 | ||||
| 200 | 1.5 | 1.2 | 0.55 | 0.48 | 0.43 | 0.33 | 2.6 | 2.5 | 2.6 | ||||
| 250 | 1.4 | 1.1 | 0.5 | 0.56 | 0.5 | 0.39 | 3.05 | 2.9 | 3.05 | ||||
| 315 | 1.4 | 1.0 | 0.45 | 0.67 | 0.29 | 0.465 | 4.5 | 3.65 | 3.45 | 3.65 | |||
| 400 | 1.3 | 1.0 | 0.4 | 0.8 | 0.71 | 0.56 | 4.3 | 4.15 | 4.3 | ||||
| 500 | 1.2 | 1.0 | 0.4 | 0.96 | 0.85 | 0.67 | 5.15 | 4.82 | 5.15 | ||||
| 630 | 1.1 | 0.8 | 0.4 | 1.2 | 1.6 | 0.81 | 6.2 | 5.86 | 6.2 | ||||
| 800 | 1.0 | 0.7 | 0.35 | 1.4 | 1.23 | 0.98 | 7.5 | 7.2 | 7.5 | ||||
| 1000 | 1.0 | 0.6 | 0.3 | 1.7 | 1.5 | 1.15 | 10.3 | 9.8 | 10.3 | ||||
| 1250 | 0.9 | 0.6 | 0.27 | 1.95 | 1.72 | 1.36 | 12.0 | 12.2 | 12.0 | ||||
