# Wolong Electric 25 MVA 35 kV Multi-Winding VFD Speed Control Drive Transformer

> Wolong Electric 25 MVA 35 kV Multi-Winding VFD Speed Control Drive Transformer belongs to the Rectifier & Electrolysis Transformers category and is rated at 25 MVA with 35/1.75 kV primary/secondary voltage. Application: Mega Motor Drives (VFD / VSD), Gas Compressors & Rolling Mill Motors. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-WL-DRV-25M-35K | Brand: Wolong Electric (Wolong Transformer) | Category: Power & Energy Equipment / Transformers / Special Industrial & Process Transformers / Rectifier & Electrolysis Transformers

**Voltformer canonical:** https://voltformer.com/product/wolong-electric-25-mva-35-kv-multi-winding-vfd-speed-control-drive-transformer - markdown version: https://voltformer.com/product/wolong-electric-25-mva-35-kv-multi-winding-vfd-speed-control-drive-transformer.md

## Overview

Wolong Electric 25 MVA 35 kV Multi-Winding VFD Speed Control Drive Transformer is intended for Mega Motor Drives (VFD / VSD), Gas Compressors & Rolling Mill Motors. Configured electrical data: 25 MVA, 35/1.75 kV primary/secondary voltage, 50 Hz, 3-phase, vector group configuration-specific vector group and short-circuit impedance 8%. Construction: Copper (Cu-Cu); cooling: ONAN/ONAF; loss class: VFD Multi-Pulse Industrial Drive 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:** Mega Motor Drives (VFD / VSD), Gas Compressors & Rolling Mill Motors
- **Target industries:** Large Rolling Mills, Oil & Gas Pipeline Compressors, Mining Conveyor Systems
- **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. / [Rectifier & Electrolysis Transformers](https://voltformer.com/category/special-industrial-process-transformers/rectifier-electrolysis-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 25 MVA |
| Primary / secondary voltage | 35 kV / 1.75 kV (±2 x 2.5%) |
| Frequency / phases | 50 Hz / 3-phase - Dy11d0 (24-pulse phase-shifted, four-secondary) |
| Short-circuit impedance (Uk) | 8% |
| No-load loss P0 | 16.50 kW |
| Load loss Pk | 135.0 kW |
| Calculated efficiency (power factor = 1) | 99.4% at 100% load; 99.6% at 50% load |
| Loss class | VFD Multi-Pulse Industrial Drive Grade |
| Windings | Copper (Cu-Cu) - cooling: ONAN/ONAF - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 62 dB(A) |
| Mass and dimensions | 42000 kg - 4800×2900×4200 mm |
| Enclosure | IP55 - wheel gauge: 1400 mm |
| LI / AC withstand | 170 kV peak / 70 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 61378-1
- IEEE C57.18.10

## Accessories

**Included:** Multi-Secondary VFD Windings, Electrostatic Shield, DGPT2 Relay
**Optional:** Online Temperature Monitoring

## 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: $280,000 – $330,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076, IEC 61378-1, IEEE C57.18.10. 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-DRV-25M-35K","quantity":1}]}
```

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