Decision facts
Start with system ratings
Verify at least 6 system inputs from the single-line diagram: system voltage, transformer capacity, fault level, enclosure class, ventilation, and extension plan. A catalog family is not a final project specification.
Evidence
Reviewed: 2026-08-01
Confirm the applicable standard
Use IEC 62271-202 as the reference family, then record 3 controls in the technical agreement: edition, destination rules, and model scope.
Evidence
Reviewed: 2026-08-01
Require model-specific evidence
Before award, request 5 evidence sets: type tests, routine-test plan, drawings, protection schedule, and factory acceptance test scope.
Evidence
Reviewed: 2026-08-01
Make the RFQ decision-ready
A usable RFQ states 8 fields: voltage, current, fault level, feeder arrangement, environment, destination standard, component preference, and delivery boundary.
Evidence
Reviewed: 2026-08-01
Comparison matrix
| Choice | Use when |
|---|---|
| Compact substation | Use when limited space, reduced civil work, factory integration, and short commissioning time are primary constraints. |
| Traditional substation | Use for very high capacity, staged expansion, utility-mandated room layouts, or projects requiring separate equipment spaces. |
Technical specification inputs
| Requirement | Project value |
|---|---|
| Start with system ratings | Verify at least 6 system inputs from the single-line diagram: system voltage, transformer capacity, fault level, enclosure class, ventilation, and extension plan. A catalog family is not a final project specification. |
| Confirm the applicable standard | Use IEC 62271-202 as the reference family, then record 3 controls in the technical agreement: edition, destination rules, and model scope. |
| Require model-specific evidence | Before award, request 5 evidence sets: type tests, routine-test plan, drawings, protection schedule, and factory acceptance test scope. |
| Make the RFQ decision-ready | A usable RFQ states 8 fields: voltage, current, fault level, feeder arrangement, environment, destination standard, component preference, and delivery boundary. |
Decision path
- 1
Start with system ratings
Verify at least 6 system inputs from the single-line diagram: system voltage, transformer capacity, fault level, enclosure class, ventilation, and extension plan. A catalog family is not a final project specification.
- 2
Confirm the applicable standard
Use IEC 62271-202 as the reference family, then record 3 controls in the technical agreement: edition, destination rules, and model scope.
- 3
Require model-specific evidence
Before award, request 5 evidence sets: type tests, routine-test plan, drawings, protection schedule, and factory acceptance test scope.
- 4
Make the RFQ decision-ready
A usable RFQ states 8 fields: voltage, current, fault level, feeder arrangement, environment, destination standard, component preference, and delivery boundary.
Civil works and lead time
A traditional substation needs a building, cable trenches, ventilation and separate equipment rooms — weeks or months of civil work. A compact substation arrives as a plug-and-play enclosure, often commissioned in days after a prepared foundation.
Evidence: Hubei Shiji Senyuan Electric Group, International Electrotechnical Commission
Application fit
Compact substations suit real estate, industrial parks, infrastructure and renewable connection points where space and schedule are tight. Traditional substations remain preferable for very high capacity, frequent extension or utility-owned sites with strict room layouts.
Evidence: Hubei Shiji Senyuan Electric Group, International Electrotechnical Commission
Standards and customization
Specify GB 17467 / IEC 62271-202 for the integrated substation, confirm transformer type (oil or dry-type), cooling, and LV configuration. A manufacturer should provide the single line diagram, protection coordination and factory acceptance testing.
Evidence: Hubei Shiji Senyuan Electric Group, International Electrotechnical Commission
Compact vs Traditional Substation
| Aspect | Compact Substation | Traditional Substation |
|---|---|---|
| Civil work | Minimal foundation | Building + trenches |
| Lead time | Days after foundation | Weeks to months |
| Capacity | Medium, standardized | High, extensible |
Evidence: Hubei Shiji Senyuan Electric Group, International Electrotechnical Commission
RFQ checklist
- 1.Single-line diagram and load schedule
- 2.Rated voltage, current, and short-circuit level
- 3.Indoor/outdoor environment and IP requirement
- 4.Protection, metering, and communication scope
- 5.Destination standard, FAT, packing, and delivery terms
Frequently Asked Questions
What is the first selection input?
Verify at least 6 system inputs from the single-line diagram: system voltage, transformer capacity, fault level, enclosure class, ventilation, and extension plan. A catalog family is not a final project specification.
Which standard should the buyer specify?
Use IEC 62271-202 as the reference family, then record 3 controls in the technical agreement: edition, destination rules, and model scope.
Is a catalog rating enough for ordering?
No. Verify at least 6 system inputs from the single-line diagram: system voltage, transformer capacity, fault level, enclosure class, ventilation, and extension plan. A catalog family is not a final project specification.
What evidence should be requested?
Before award, request 5 evidence sets: type tests, routine-test plan, drawings, protection schedule, and factory acceptance test scope.
What belongs in the RFQ?
A usable RFQ states 8 fields: voltage, current, fault level, feeder arrangement, environment, destination standard, component preference, and delivery boundary.
Evidence sources
- SJSY official product catalogHubei Shiji Senyuan Electric Group
- IEC 62271-202, high-voltage/low-voltage prefabricated substationsInternational Electrotechnical Commission
Reviewed by Eshan Peng, General Manager(2026-08-01)
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