# Dachi Electric 240 MVA 220/35-35 kV Dual-Secondary Split OLTC Power Transformer

> Dachi Electric 240 MVA 220/35-35 kV Dual-Secondary Split OLTC Power Transformer belongs to the Substation Step-Down Power Transformers (110-330 kV) category and is rated at 240 MVA with 220/35 kV primary/secondary voltage. Application: Thermal & Hydro Plant Generator Step-Up & Heavy Industry Switchyards. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-DCH-SPL-240M-220K | Brand: Shandong Dachi Electric (Dachi Group) | Category: Power & Energy Equipment / Transformers / High-Voltage & Transmission Power Transformers / Substation Step-Down Power Transformers (110-330 kV)

**Voltformer canonical:** https://voltformer.com/product/dachi-electric-240-mva-220-35-35-kv-dual-secondary-split-oltc-power-transformer - markdown version: https://voltformer.com/product/dachi-electric-240-mva-220-35-35-kv-dual-secondary-split-oltc-power-transformer.md

## Overview

Dachi Electric 240 MVA 220/35-35 kV Dual-Secondary Split OLTC Power Transformer is intended for Thermal & Hydro Plant Generator Step-Up & Heavy Industry Switchyards. Configured electrical data: 240 MVA, 220/35 kV primary/secondary voltage, 50 Hz, 3-phase, vector group YNd11-d11 (Split Winding) and short-circuit impedance 16%. Construction: Copper (Cu-Cu); cooling: ONAN/ONAF/ODAF; loss class: Split Winding High Voltage 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:** Thermal & Hydro Plant Generator Step-Up & Heavy Industry Switchyards
- **Target industries:** Regional Transmission Substations, Mega Industrial Zone Main Infeeds, Steel Manufacturing Works
- **Brand:** [Shandong Dachi Electric (Dachi Group)](https://voltformer.com/brand/dachi-electric.md) - One of China's largest transformer industrial complexes with 80 million kVA annual capacity; Shandong Dachi Electric produces 500 kV and 220 kV large on-load tap-changing split power transformers and
- **Category:** [Power & Energy Equipment](https://voltformer.com/catalog.md) / **Transformers** / [High-Voltage & Transmission Power Transformers](https://voltformer.com/category/power-transmission-transformers.md): 5 MVA–1000 MVA 110 kV, 154 kV, 380 kV, 500 kV and 1000 kV UHV AC/DC transmission and interconnection power transformers. / [Substation Step-Down Power Transformers (110-330 kV)](https://voltformer.com/category/power-transmission-transformers/substation-step-down-power-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 240 MVA |
| Primary / secondary voltage | 220 kV / 35 kV (±8 x 1.25% OLTC) |
| Frequency / phases | 50 Hz / 3-phase - YNd11-d11 (split winding) |
| Short-circuit impedance (Uk) | 16% |
| No-load loss P0 | 69.00 kW |
| Load loss Pk | 430.0 kW |
| Calculated efficiency (power factor = 1) | 99.79% at 100% load; 99.85% at 50% load |
| Loss class | Split Winding High Voltage Grade |
| Windings | Copper (Cu-Cu) - cooling: ONAN/ONAF/ODAF - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 68 dB(A) |
| Mass and dimensions | 178000 kg - 8300×4700×7300 mm |
| Enclosure | IP55 - wheel gauge: 2000 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
- IEEE C57
- TS EN 60076

## Accessories

**Included:** MR Vacuum OLTC, Online DGA Gas Analyzer, Buchholz Relay
**Optional:** Direct-in-Winding Fiber Temperature Probes

## Official sources

- https://www.chinadachi.com/en/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: $1,080,000 – $1,300,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 48 months
- Compliance candidates: IEC 60076, IEEE C57, TS EN 60076. 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-DCH-SPL-240M-220K","quantity":1}]}
```

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