Technical Specifications
| Parameter | Value |
|---|---|
| Rated Capacity | 630 kVA |
| Phases | 3-Phase |
| Frequency | 50 Hz / 60 Hz |
| High Voltage | 10 kV (customizable) |
| Low Voltage | 400 V (customizable) |
| Vector Group | Dyn11 |
| Insulation Class | Class H (180 °C) |
| Temperature Rise Limit | 125 K |
| Cooling Method | ANAF (Air Natural + Air Forced) |
| Installation | Indoor |
| Energy Efficiency | GB 20052-2024 Grade 1 / Grade 2 · EU No. 548/2014 & 2019/1783 Tier 1 / Tier 2 |
| Applicable Standards | GB/T 10228-2023 · GB 1094.1.2-2013 · GB 1094.3-2017 · GB 20052-2024 · IEC 60076-11 |
| Winding Material | Copper (standard) / Aluminium (available on request) |
| Protection Degree | IP00 / IP20 / IP30 (enclosure options) |
Real Delivery Case — SCB14-630/10, 630 kVA
The following nameplate data and images are from an actual delivered unit — SCB14-630/10, Ex-factory No. D240090, manufactured and dispatched from Zhongxin General’s Sichuan facility in October 2024. Every parameter shown on the nameplate is verified through routine factory acceptance testing before dispatch.
SCB14-630/10 Nameplate Data — Actual Delivered Unit
| Parameter | Value |
|---|---|
| Model | SCB14-630/10 |
| Product Code | 1ZX.710.3416 |
| Rated Capacity | 630 kVA |
| Phases | 3-Phase |
| Rated Frequency | 50 Hz |
| High Voltage (5 Taps) | 10,500 V / 10,250 V / 10,000 V / 9,750 V / 9,500 V |
| Rated HV Current | 36.4 A (at 10,000 V) |
| Low Voltage | 400 V |
| Rated LV Current | 909.3 A |
| Vector Group | Dyn11 |
| Insulation Level | LI 75 AC 35 / LI AC 3 |
| Thermal Class | Class H (180 °C) |
| Temperature Rise Limit | 125 K |
| Cooling Method | ANAF |
| Service Conditions | Indoor |
| Short-Circuit Impedance | 5.71% |
| Total Weight | 2,340 kg |
| Ex-factory No. | D240090 |
| Manufactured | October 2024 |
| Applicable Standards | GB 1094.1.2-2013 · GB/T 10228-2023 · GB 20052-2024 · GB 1094.3-2017 |
Manufacturing Process — From Winding to Dispatch
The quality of a cast resin dry-type transformer is determined in the manufacturing process — particularly in the LV foil winding preparation, epoxy vacuum casting, and curing stages. The following images document the actual production steps at Zhongxin General’s Sichuan facility for the 630 kVA unit.
Low-Voltage Foil Winding
The low-voltage winding adopts a foil winding structure, solving the axial helical angle problem inherent in conventional wire winding and achieving better ampere-turn balance. High-quality copper foil is wound by automatic foil winding machine. The LV output copper busbars are connected to the foil winding using argon-protected welding, ensuring minimal contact resistance — critical for reliable delivery of the 909.3 A rated LV current. DMD epoxy resin pre-impregnated cloth is used between winding layers for interlayer insulation and bonding.
Epoxy Vacuum Casting and Curing
The high-voltage winding is vacuum-cast with filled epoxy resin. This process removes air from the winding structure before resin injection, virtually eliminating partial discharge and ensuring uniform dielectric strength throughout the coil. Glass fiber mesh plates reinforce the inner and outer walls of the HV winding, enhancing mechanical strength and short-circuit withstand capability. After casting, all coils enter a controlled hot-air curing oven where integral forming takes place under controlled temperature profiles.
HV Winding After Demoulding
Following completion of the curing cycle, the HV epoxy cast windings are demoulded. The clean, void-free resin surface visible on the finished coils is the direct result of the vacuum casting process. This encapsulation gives SCB-series cast resin transformers their core operating characteristics: flame-retardant, fire-proof, maintenance-free, pollution-free, and capable of operating reliably in humid or contaminated environments where oil-immersed units would require additional protection.
Core and Coil Assembly
With casting and curing complete, the transformer moves into core-and-coil assembly. The iron core uses imported high-quality cold-rolled grain-oriented silicon steel sheets with a five-stage full-oblique joint structure, bound with F-class non-woven tape and surface-coated with epoxy resin to reduce no-load loss, no-load current, and core noise. Structural clamping components are fitted, and the HV-to-LV air gap spacing — visible in the assembly detail image — is set to the designed insulation clearance and creepage distances required for reliable 10 kV class operation. The axial cooling ducts in the LV winding are integral to the ANAF thermal management system that achieves the 125 K temperature rise limit.
Completed Unit — HV Terminal Detail
The high-voltage terminal end features off-circuit tap connections providing ±2×2.5% voltage adjustment capability (five positions: 10,500 V / 10,250 V / 10,000 V / 9,750 V / 9,500 V), allowing the transformer to match local grid voltage variations without on-load interruption.
Temperature Control System
PT100 platinum resistance sensors are embedded in the low-voltage coil during the manufacturing process. These sensors feed into an intelligent temperature controller providing:
- Sequential detection and display of three-phase winding temperatures with fault self-diagnosis
- Hot-spot phase winding temperature display
- Over-temperature alarm output (adjustable setpoint)
- Over-temperature trip output (adjustable setpoint)
- Automatic or timed fan start/stop (Black Box function)
Optional functions include analog current output, RS485 serial interface for centralized monitoring and SCADA integration, additional iron core or ambient temperature detection points, and additional active output contacts.
Cooling fans are cross-flow top-blowing type, featuring low noise, high wind pressure, and compact aesthetics. Under ANAF forced-air cooling conditions, the transformer can handle continuous overload operations with superior thermal safety margin compared to ANAN-only units.
Applicable Standards and Testing
Every 630 kVA dry-type transformer manufactured by Zhongxin General undergoes a full programme of routine tests before leaving the factory. No unit is dispatched without a complete test report.
Routine tests (every unit): winding resistance measurement, voltage ratio and vector group verification, no-load loss and no-load current, load loss and short-circuit impedance, induced overvoltage withstand test, separate-source AC withstand test, partial discharge measurement.
Type tests (conducted on representative units; reports available on request): temperature rise test, lightning impulse test.
Special tests (available on request): sound level measurement, short-circuit withstand test.
All tests are conducted in accordance with IEC 60076-11 and GB/T 10228-2023. Test reports and ITP (Inspection and Test Plan) documentation can be provided prior to or alongside shipment. Factory Acceptance Test with client witness is supported.
For a detailed account of how Zhongxin General navigated EU standards compliance — including ITP, FAT witness, CE Declaration of Conformity, and bolt torque documentation — on a real dry-type transformer export project to Europe, see how we navigated EU standards compliance on a real 1250 kVA export project.
Available Options and Configurations
| Parameter | Standard / Base Option | Other Available Options |
|---|---|---|
| Winding material | Copper | Aluminium |
| HV side voltage | 6 kV, 10 kV | Customizable to match local grid standards |
| LV side voltage | 380 V, 400 V, 415 V, 433 V | Customizable to other values per local grid |
| Frequency | 50 Hz | 60 Hz |
| Energy efficiency grade | GB 20052-2024 Grade 1, 2, or 3 | — |
| Tap changer | ±2×2.5% (off-circuit) | OLTC on-load tap changer available |
| Protection degree | IP00 (open type) | IP20, IP30 (with metal enclosure) |
| Enclosure material | — | Cold-rolled steel plate or stainless steel |
| Temperature control | Standard intelligent controller | RS485 / Modbus communication (optional) |
| Cooling method | ANAF (natural + forced-air) | ANAN (natural cooling only) |
| High-altitude version | Not applicable | For installations above 1,000 m a.s.l. |
| Special environment version | Not applicable | Tropical, high-humidity, coastal salt-spray |
Application: Integration into Prefabricated Substations
The 630 kVA rating sits at one of the most widely deployed capacities for urban commercial distribution, industrial parks, and new energy project collection points. Its compact footprint and oil-free, flame-retardant construction make it the standard choice for integration into prefabricated box-type substations where fire safety regulations, environmental compliance, and fast deployment are all mandatory requirements.
For a real-world example of dry-type transformers deployed inside prefabricated substations, see our Modular Smart Substation for Yichuan LNG Energy Project — Yan’an, Shaanxi, where Zhongxin General delivered four complete prefabricated smart substation modules ahead of the contractual deadline.
For substations requiring an oil-immersed main transformer at higher power ratings, see our prefabricated box substations delivered to PetroChina’s Luntai project in Xinjiang, designed for extreme-environment oilfield operation.
Batch Production Capability
Zhongxin General’s Sichuan production lines support batch production of dry-type transformers across the complete 30 kVA to 8,000 kVA capacity range, supporting 6 kV, 10 kV, and 35 kV voltage classes. The 630 kVA capacity sits in our most active production range alongside the 500–1,000 kVA segment, with mature tooling, established quality protocols, and available capacity for volume orders.
For a reference on large-scale hospital power infrastructure that included multiple dry-type transformers, see Zhongxin General’s 16,730 kVA intelligent power system delivered for Xinjin District People’s Hospital, which featured 12 transformers from 500 kVA to 2,000 kVA in a single project.
Typical Applications
The 630 kVA cast resin dry-type transformer is one of the most widely deployed medium-capacity distribution transformers across commercial and industrial sectors. Its flame-retardant, oil-free, maintenance-free characteristics make it the preferred choice for indoor and urban installations where fire safety and environmental compliance are mandatory.
Typical installations include commercial buildings and retail facilities (shopping centres, high-rise office and residential towers, hotels, airports), small-to-medium industrial parks and manufacturing facilities, chemical plants and process industry, agricultural facilities and rural electrification projects, new energy projects (solar PV step-up stations, wind farm collection systems), data centres and IT facilities where zero-oil-spill risk is a requirement, rail transit power distribution, and healthcare facilities. Its EU-compliant Grade 1 efficiency option also makes it a regular choice for European import projects.
For a detailed case study of dry-type transformer export to a European buyer — covering IEC 60076-11 compliance, FAT witness, CE Declaration of Conformity, and two-crate export packaging — see When International Standards Come Knocking: exporting 1,250 kVA dry-type transformers to Europe.
Inquire About 630 kVA Dry-Type Transformer
Need a quotation, technical datasheet, or Factory Acceptance Test arrangement for a 630 kVA cast resin dry-type transformer? Whether you are sourcing for a single installation, a batch order, or an international export project requiring IEC or EU compliance, Zhongxin General’s engineering team can provide specifications, pricing, compliance documentation, and delivery timelines matched to your requirements.
Tell us your grid voltage, required LV output, frequency, efficiency grade, winding material preference, and any special environmental or installation conditions — and we will configure the right unit for your project.
[Contact Us for Price & Datasheet]
About Zhongxin General — Dry-Type Transformer Manufacturer and Factory
Zhongxin General (Sichuan Zhongxin General Electric Energy Co., Ltd.) is a China-based manufacturer and factory specialising in oil-immersed power transformers and dry-type power transformers, HV/MV/LV switchgear, prefabricated substations, energy storage systems, and EV charging infrastructure.
Headquartered in Xinjin District, Chengdu, Sichuan Province, the company holds National “Little Giant” Enterprise status — China’s highest SME innovation designation — alongside National High-Tech Enterprise certification.
Our dry-type transformer portfolio covers 30 kVA to 8,000 kVA, configurable to 6 kV, 10 kV, and 35 kV voltage classes, in copper or aluminium winding, to GB, IEC 60076-11, and EU standards for domestic and international projects. The 630 kVA cast resin dry-type transformer described on this page sits at one of the most actively produced capacities in our SCB-series range — using the same manufacturing process, the same material standards, and the same testing protocol that applies across the full range from our 30 kVA entry-level units to our 1,250 kVA units shipped to European buyers.
Every transformer we manufacture undergoes full routine testing to IEC 60076-11 or GB/T 10228-2023 before dispatch. Test reports are issued as standard documentation with every order.
Browse all case studies to evaluate Zhongxin General as a supplier — from large-scale hospital installations to European export projects and dedicated industrial substations.
