# Wolong Electric 50 MVA 220/27.5 kV HSR Scott-Connected High-Speed Train Traction Transformer

> Wolong Electric 50 MVA 220/27.5 kV HSR Scott-Connected High-Speed Train Traction Transformer belongs to the Railway & Traction Transformers category and is rated at 50 MVA with 220/27.5 kV primary/secondary voltage. Application: 350 km/h High-Speed Rail 27.5 kV Catenary Traction Substations. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-WL-SCOTT-50M-220 | Brand: Wolong Electric (Wolong Transformer) | Category: Power & Energy Equipment / Transformers / Special Industrial & Process Transformers / Railway & Traction Transformers

**Voltformer canonical:** https://voltformer.com/product/wolong-electric-50-mva-220-27-5-kv-hsr-scott-connected-high-speed-train-traction-transformer - markdown version: https://voltformer.com/product/wolong-electric-50-mva-220-27-5-kv-hsr-scott-connected-high-speed-train-traction-transformer.md

## Overview

Wolong Electric 50 MVA 220/27.5 kV HSR Scott-Connected High-Speed Train Traction Transformer is intended for 350 km/h High-Speed Rail 27.5 kV Catenary Traction Substations. Configured electrical data: 50 MVA, 220/27.5 kV primary/secondary voltage, 50 Hz, 3-phase, vector group configuration-specific vector group and short-circuit impedance 10.5%. Construction: Copper (Cu-Cu); cooling: ONAN/ONAF; loss class: High Speed Railway Traction Grade. These values support preliminary engineering selection; verify insulation levels, thermal limits, short-circuit duty, installation conditions and applicable standards against the manufacturer datasheet and the site study.

- **Application:** 350 km/h High-Speed Rail 27.5 kV Catenary Traction Substations
- **Target industries:** High-Speed Railway Lines, Railway Traction Electrification Projects
- **Brand:** [Wolong Electric (Wolong Transformer)](https://voltformer.com/brand/wolong-electric.md) - Global electromechanical giant in heavy-industry motor drive transformers (VFD), 25 kV Scott traction transformers for high-speed trains, mining flameproof ex-proof transformers and industrial process
- **Category:** [Power & Energy Equipment](https://voltformer.com/catalog.md) / **Transformers** / [Special Industrial & Process Transformers](https://voltformer.com/category/special-industrial-process-transformers.md): Arc furnace (EAF), green hydrogen electrolyser, rectifier, traction and mining Ex-proof transformers. / [Railway & Traction Transformers](https://voltformer.com/category/special-industrial-process-transformers/railway-traction-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 50 MVA |
| Primary / secondary voltage | 220 kV / 27.5 kV (±4 x 2.5% NLTC) |
| Frequency / phases | 50 Hz / 3-phase - Scott (3-phase / 2-phase balanced) |
| Short-circuit impedance (Uk) | 10.5% |
| No-load loss P0 | 24.00 kW |
| Load loss Pk | 175.0 kW |
| Calculated efficiency (power factor = 1) | 99.6% at 100% load; 99.73% at 50% load |
| Loss class | High Speed Railway Traction Grade |
| Windings | Copper (Cu-Cu) - cooling: ONAN/ONAF - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 64 dB(A) |
| Mass and dimensions | 72000 kg - 6100×3800×5300 mm |
| Enclosure | IP55 - wheel gauge: 1600 mm |
| LI / AC withstand | 950 kV peak / 395 kV rms - partial discharge: 5 pC |
| Environment | -25°C / +40°C; altitude ≤ 1000 m |
| Core steel | CRGO Laser-Treated Grain-Oriented Silicon Steel (23ZDMH85 / Baosteel B23R085) |
| Bushings / terminals | Direct Copper Busbar Terminals (Busbar Integrated / IP00-IP31) |

## Standards

- IEC 60076
- IEC 60310
- EN 50329
- TB/T 2825

## Accessories

**Included:** Scott Phase Balanced Winding Configuration, Buchholz Relay, Magnetic Oil Gauge
**Optional:** DGA Gas Analyzer

## Official sources

- https://ess.wolong.com/product/index.html

- **Source scope:** manufacturer-family
- **Last reviewed:** 2026-09-13

Manufacturer portfolio/family source. Confirm the exact order code, guaranteed ratings and project-specific options against the current OEM datasheet before procurement or an SLD study.

## Pricing & Logistics

- Pricing type: RFQ (Project Engineering) - Indicative range: $460,000 – $540,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076, IEC 60310, EN 50329, TB/T 2825. Verify applicability and conformity against the exact offered model and project jurisdiction.

## RFQ

Request a formal factory quotation via Voltformer RFQ:

```json
POST https://voltformer.com/api/v1/rfq
{"companyName":"Example Energy","email":"procurement@example.com","items":[{"skuOrId":"VF-WL-SCOTT-50M-220","quantity":1}]}
```

Full catalog JSON: https://voltformer.com/agent-catalog.json - OpenAPI: https://voltformer.com/openapi.json