# Haihong S20 1600 kVA 35/0.4 kV 3D Triangular Wound-Core Ultra-Quiet Hermetic Transformer

> Haihong S20 1600 kVA 35/0.4 kV 3D Triangular Wound-Core Ultra-Quiet Hermetic Transformer belongs to the Oil-Immersed Hermetic Distribution Transformers category and is rated at 1600 kVA with 35/0.4 kV primary/secondary voltage. Application: Urban Residential Areas, Hospitals & Noise-Sensitive Industrial Plants. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-HAI-S20-3D-1600-35 | Brand: Haihong Electric (Guangdong Haihong) | Category: Power & Energy Equipment / Transformers / Distribution Transformers / Oil-Immersed Hermetic Distribution Transformers

**Voltformer canonical:** https://voltformer.com/product/haihong-s20-1600-kva-35-0-4-kv-3d-triangular-wound-core-ultra-quiet-hermetic-transformer - markdown version: https://voltformer.com/product/haihong-s20-1600-kva-35-0-4-kv-3d-triangular-wound-core-ultra-quiet-hermetic-transformer.md

## Overview

Haihong S20 1600 kVA 35/0.4 kV 3D Triangular Wound-Core Ultra-Quiet Hermetic Transformer is intended for Urban Residential Areas, Hospitals & Noise-Sensitive Industrial Plants. Configured electrical data: 1600 kVA, 35/0.4 kV primary/secondary voltage, 50 Hz, 3-phase, vector group Dyn11 and short-circuit impedance 6%. Construction: Copper (Cu-Cu); cooling: ONAN; loss class: Ecodesign Tier 2 (3D Wound Core). 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:** Urban Residential Areas, Hospitals & Noise-Sensitive Industrial Plants
- **Target industries:** Large Industrial Manufacturing Plants, 24/7 Continuous Production, Green Building Certified Facilities (LEED/BREEAM)
- **Brand:** [Haihong Electric (Guangdong Haihong)](https://voltformer.com/brand/haihong-electric.md) - Inventor and global leader of 3D Three-Dimensional Triangular Wound-Core transformer technology; Haihong Electric delivers revolutionary efficiency from 110 kV oil power transformers to naturally-vent
- **Category:** [Power & Energy Equipment](https://voltformer.com/catalog.md) / **Transformers** / [Distribution Transformers](https://voltformer.com/category/distribution-transformers.md): 50 kVA–3150 kVA oil-immersed hermetic, conservator and cast-resin dry-type medium-voltage distribution transformers. / [Oil-Immersed Hermetic Distribution Transformers](https://voltformer.com/category/distribution-transformers/oil-immersed-hermetic-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 1600 kVA |
| Primary / secondary voltage | 35 kV / 0.4 kV (±2 x 2.5%) |
| Frequency / phases | 50 Hz / 3-phase - Dyn11 |
| Short-circuit impedance (Uk) | 6% |
| No-load loss P0 | 1.05 kW |
| Load loss Pk | 11.5 kW |
| Calculated efficiency (power factor = 1) | 99.22% at 100% load; 99.51% at 50% load |
| Loss class | Ecodesign Tier 2 (3D Wound Core) |
| Windings | Copper (Cu-Cu) - cooling: ONAN - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 44 dB(A) |
| Mass and dimensions | 4200 kg - 1850×1200×1880 mm |
| Enclosure | IP54 - wheel gauge: 820 mm |
| LI / AC withstand | 170 kV peak / 70 kV rms - partial discharge: 5 pC |
| Environment | -25°C / +40°C; altitude ≤ 1000 m |
| Core steel | 3D Triangular Continuous Wound Core (Hi-B Grain-Oriented Steel - Seamless) |
| Bushings / terminals | Direct Copper Busbar Terminals (Busbar Integrated / IP00-IP31) |

## Standards

- IEC 60076
- TS EN 50708 series
- EU 548/2014 + 2019/1783 Tier 2

## Accessories

**Included:** 3D Wound Core, DGPT2 Hermetic Protection, Pressure Relief
**Optional:** Plug-in Bushing

## Official sources

- https://en.gdhaihong.com/

- **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 (On Request) - Indicative range: $22,000 – $25,500 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076, TS EN 50708 series, EU 548/2014 + 2019/1783 Tier 2. 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-HAI-S20-3D-1600-35","quantity":1}]}
```

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