Question 1

What is a prefabricated substation?

Accepted Answer

A factory-built, factory-tested power distribution unit that integrates HV switchgear, transformer, and LV panels inside a single weatherproof enclosure. It arrives on site as one piece - lift onto a foundation, terminate cables, energize.

Question 2

Why choose this over a traditional substation?

Accepted Answer

1. 50% shorter construction time and ~10% lower cost;
2. 1/3 to 1/5 the footprint of a conventional build;
3. Single-source responsibility - one supplier for design, manufacture, testing, and commissioning;
4. Relocatable - disconnect, lift, and move to a new site.

Question 3

What voltages and capacities?

Accepted Answer

1. HV side: 6kV to 110kV (most common: 10kV, 20kV, 35kV)
2. LV side: 400V standard
3. Capacity: 30kVA to 2,500kVA

Question 4

Oil-immersed or dry-type transformer?

Accepted Answer

Oil-immersed: Lower cost with superior overload capacity. Standard choice for outdoor industrial applications.
Dry-type: Fire-safe and low maintenance. Preferred for indoor/underground installations, hospitals and urban residential areas.
Both can be housed within the same enclosure. Dry-type insulation options: Class F (155 deg C) or Class H (180 deg C).

Question 5

How long does installation take?

Accepted Answer

3-7 working days on site** (foundation prep, crane placement, cable termination, commissioning). A conventional substation takes 4-12 weeks.

Question 6

What IP rating?

Accepted Answer

Standard: IP54 (dust-protected, splash-proof); 
Optional: IP55 (water-jet protection), IP65 (dust-tight); 
Internal compartments: IP2X minimum; 
Corrosion testing: 672h salt spray (GB/T 2423.17), IK10 impact rating.

Question 7

How long will it last?

Accepted Answer

Enclosure (galvanized/stainless steel) : 25-30+ years; 
Oil-immersed/Dry-type transformer: 25-30+ years; 
Vacuum circuit breakers: 20-30 years; 
Overall unit: 25 years minimum.

Question 8

What maintenance is required?

Accepted Answer

Visual inspection (enclosure, seals): Every 6 months; 
Ventilation filter check: Every 3-6 months; 
Oil sampling (oil-type only): Every 1-2 years; 
Protection relay / switchgear test: Annually; 
Full condition assessment: Every 5 years.

Question 9

Can it be customized?

Accepted Answer

Yes. Everything is configurable: layout (three-compartment arrangement), transformer type and capacity (50kVA-2,500kVA), voltage levels (6kV-35kV), outgoing circuits (4-16+ feeders), reactive compensation (0-360 kvar), enclosure material and color, smart features (SCADA, IEC 61850), and environmental hardening (high altitude, extreme cold, coastal corrosion).

Question 10

What standards apply?

Accepted Answer

GB/T 17467-2020, Chinese national standard for prefabricated substations; 
IEC 62271-202:2022 , International standard; 
IEC 60076 series, Transformer performance; 
GB/T 4208 / IEC 60529, IP enclosure protection; 
IEC 61850, Substation automation; 
CE, Market-specific compliance; 
ISO 9001, Quality management.

Question 11

What are the lead times?

Accepted Answer

Standard (pre-engineered) , 25-40 working days; 
Customized, 40-55 working days; 
Highly specialized, 50-75 working days.

Question 12

Can it be relocated?

Accepted Answer

Yes. Designed for it: ISO-compatible dimensions, factory lifting lugs (rated 1.5 * unit weight), plug-and-play cable connections. Common scenarios: temporary construction power, mining site moves, emergency backup, project phase transitions.

Question 13

What site conditions are needed?

Accepted Answer

| Condition | Standard | Max |
|---|---|---|
| Temperature | -25 deg C to +40 deg C | -40 deg C to +50 deg C |
| Altitude | <=1,000m | 4,000m+ |
| Humidity | <=95% (daily avg, 25 deg C) | Tropical design available |
| Foundation | Level concrete pad, C25, 200-300mm | Per civil engineer spec |
| Seismic | 0.2g horizontal | Intensity VIII (GB 50011) - shake-table validated |
| Wind | <=35 m/s | Typhoon anchoring available |
| Pollution | Class III | Class IV (coastal/heavy industrial) |

Question 14

How noisy is it?

Accepted Answer

| Type (1000kVA) | Noise at 1m |
|---|---|
| Oil-immersed | 50-55 dB(A) |
| Dry-type (forced air) | 55-65 dB(A) |
| With acoustic enclosure | 40-50 dB(A) |

50-55 dB approx. normal conversation. Mitigation: rubber damping pads, acoustic insulation panels, low-noise fans. Noise-sensitive locations: add-on acoustic enclosures reduce by another 10-20 dB.

Question 15

What fire and safety features are included?

Accepted Answer

Compartment separation: HV/transformer/LV sections isolated by EI >= 120 min fire partitions (GB/T 9978.1);
Materials: EN 13501-1 Class A1 ceramic silicone rubber, 3h mineral wool insulation;
Five-prevention interlock: mechanical type to prevent live-line misoperation (GB/T 3906-2020);
Internal arc protection: IAC-rated (IEC 62271-200/2020), roof pressure relief ducts;
Thermal monitoring: threshold alarm & automatic trip;
Continuous earth bar: >=2 grounding terminals.

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