1. What Is a Package Substation? (Package Substation)
Package substation = medium voltage switchgear + transformer + low-voltage distribution cabinetAn assembled unit pre-installed in a single enclosure, replacing a conventional electrical room. Small footprint, fast installation, suitable for outdoor placement.
2. Package Substation Composition (3 Compartments)
| Compartment | Contents | Component |
|---|---|---|
| Medium Voltage Compartment | Incoming + Protection | Load break switch / fuse |
| Transformer Compartment | Step-down | Oil-immersed / dry-type transformer |
| Low-Voltage Compartment | Outgoing Distribution | Low-voltage cabinet + metering |
3. European vs. American Package Substations (2 Mainstream Types)
European package substation: 3 separate compartments, independent transformer cooling, easy maintenance, larger footprint;American package substation: transformer and switchgear integrated, smaller footprint, harder to maintain. European type is the mainstream choice in China.
4. Package Substation Selection (by capacity)
| Capacity | HV unit | Low-Voltage Outgoing Feeders | Dimensions (m) |
|---|---|---|---|
| ≤ 315kVA | Load break switch + fuse | 4 circuits | 2.0×1.2×1.6 |
| 400–630kVA | Vacuum circuit breaker | 6 circuits | 2.2×1.5×1.8 |
| 800–1250kVA | SF6 circuit breaker | 8 circuits | 2.5×1.8×2.0 |
5. Package Substation Foundation Requirements (GB 50053)
Concrete platform at least 300 mm above grade, with ventilation louvers and drainage; underground cable entry and exit. Grounding grid resistance ≤ 4Ω.
FAQ FAQ
Package substation vs. electrical room — what's the difference?
A package substation is a pre-assembled unit (small footprint, fast installation); an electrical room is a civil-built room (more space, easier maintenance).
European-style or American-style package substation — which is better?
European-style dominates in China (easier maintenance); American-style is more compact but harder to service.
Can a package substation be installed outdoors?
Yes, with ingress protection of IP54 or better, plus a rain hood and ventilation.
How is the package substation foundation built?
Concrete platform at least 300 mm above grade, with drainage and ventilation; grounding resistance ≤ 4Ω.
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