A new batch of container-type prefabricated cabin substations has completed final assembly and full routine testing at ZHONGXIN GENERAL’s Chengdu manufacturing facility and is now ready for dispatch. Each unit integrates a 2500 kVA oil-immersed power transformer, medium-voltage switchgear, low-voltage distribution panels, and reactive power compensation — all pre-wired, pre-tested, and housed in a single weatherproof enclosure designed for plug-and-play energization on site.
Built for Speed, Engineered for Reliability
The dispatched units are model YBM-12/0.4 prefabricated substations, engineered for 10 kV / 0.4 kV distribution applications. At the heart of each cabin sits an S11-2500/10 oil-immersed transformer with a Dyn11 vector group, ONAN (oil-natural air-natural) cooling, and a short-circuit impedance of 4.96%. The transformer offers five off-circuit tapping positions (+/-2×2.5%) spanning 9,500 V to 10,500 V on the high-voltage side, delivering a stable 400 V at 3,608.4 A on the low-voltage side.
Power Transformer — S11-2500/10
| Parameter | Specification |
|---|---|
| Product Type | S11-2500/10 |
| Product Code | 7122B |
| Rated Capacity | 2,500 kVA |
| Rated Voltage | 10 kV / 0.4 kV |
| Rated Current (HV / LV) | 144.3 A / 3,608.4 A |
| Vector Group | Dyn11 |
| Insulation Level | LI 75 AC 35 / LI AC 5 |
| Phases | 3-phase |
| Rated Frequency | 50 Hz |
| Tapping Range | ±2×2.5% (9,500 – 10,500 V) |
| Short-Circuit Impedance | 4.96% |
| Cooling Method | ONAN (Oil-Natural Air-Natural) |
| Service Condition | Outdoor |
| Lifting Weight (Core & Coil) | 3,010 kg |
| Insulation Oil Weight | 885 kg |
| Total Weight | 5,430 kg |
| Applicable Standard | GB 1094.1/.2-2013, GB 1094.3-2017, GB/T 6451-2023, GB 20052-2024 |
| Ex-Factory No. | A260287 |
| Ex-Factory Date | August 2026 |
Prefabricated Substation — YBM-12/0.4
| Parameter | Specification |
|---|---|
| Model | YBM-12/0.4 |
| Rated Capacity | 2,500 kVA |
| Rated Voltage | 10 kV / 0.4 kV |
| Rated Current (HV / LV) | 144.3 A / 3,608.5 A |
| Rated Frequency | 50 Hz |
| Phases | 3-phase |
| Protection Rating | IP33D |
| Cooling Method | Natural / Forced Air |
| Service Condition | Outdoor |
| Total Weight | approx. 19,000 kg (19 metric tons) |
| Applicable Standard | GB/T 17467-2020 |
| Ex-Factory No. | 260710002 |
| Ex-Factory Date | August 2026 |
What’s Inside the Cabin
Beyond the transformer, each prefabricated cabin is a complete, self-contained power distribution system. The interior is divided into functionally segregated compartments:
- MV Switchgear Compartment — ring-main unit or breaker panel for 10 kV incoming supply and protection.
- LV Distribution Compartment — main incoming breaker, feeder breakers, and a color-coded copper busbar system (red / yellow / green phase identification).
- Transformer Compartment — the S11-2500/10 oil-immersed unit with forced-air cooling fans, temperature monitoring, and fire-resistant segregation.
- Reactive Power Compensation Compartment — capacitor bank fitted with CHNT CJ19-series contactors and NT00 fuse links for automatic power factor correction.
The enclosure carries an IP33D protection rating against solid objects and vertical rain, with a total unit weight of approximately 19 metric tons. All units comply with GB/T 17467-2020 (prefabricated substations) and the GB 1094 series (power transformers). Every unit undergoes full routine testing before dispatch — including winding resistance measurement, turns-ratio verification, insulation resistance, no-load loss, load loss, and impedance voltage tests.
Why Prefabricated, Why Now
As renewable energy projects, data centers, industrial parks, and EV charging infrastructure continue to expand globally, project timelines are shrinking. Traditional site-built substations require civil works, multiple equipment deliveries, and weeks of on-site assembly and testing. Prefabricated cabin substations arrive as a single, integrated unit — connect the incoming cable, connect the outgoing feeders, and energize. This approach can cut on-site installation time by 70% or more compared with conventional substation construction.
ZHONGXIN GENERAL’s prefabricated cabin product line has been deployed across ports, airports, mines, oil and gas projects, EV charging stations, and urban distribution networks, serving a broad range of power infrastructure applications worldwide.
About ZHONGXIN GENERAL
Sichuan Zhongxin General Electric Energy Co., Ltd. (ZHONGXIN GENERAL) is a national-level “Specialized, Refined, Distinctive & Innovative” (Little Giant) enterprise and a National High-Tech Enterprise based in Chengdu, China. Operating a 20,000 m2 intelligent manufacturing facility with 3 million kVA annual production capacity, the company manufactures oil-immersed and dry-type transformers, HV/LV switchgear, prefabricated substations, energy storage systems, and EV charging infrastructure.
Guided by its mission — “Intelligently manufacture premium power equipment, empower dual-carbon green energy” — ZHONGXIN GENERAL serves customers across China, Central Asia, Africa, Europe, and the Americas, with strategic cooperation partnerships with State Grid Corporation of China and China Southern Power Grid. The company’s core values place customers at the foundation, talent as the root, innovation as the driving force, and quality as the lifeblood of the enterprise — principles reflected in every unit that leaves the factory floor.
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