# TBEA S20 Series 2500 kVA 35/0.4 kV High-Efficiency Hermetic Distribution Transformer

> TBEA S20 Series 2500 kVA 35/0.4 kV High-Efficiency Hermetic Distribution Transformer belongs to the Oil-Immersed Hermetic Distribution Transformers category and is rated at 2500 kVA with 35/0.4 kV primary/secondary voltage. Application: 2.5 MVA High-Power Oil-Immersed Hermetic Distribution. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-TBEA-S20-2500-35 | Brand: TBEA (Tebian Electric Apparatus) | Category: Power & Energy Equipment / Transformers / Distribution Transformers / Oil-Immersed Hermetic Distribution Transformers

**Voltformer canonical:** https://voltformer.com/product/tbea-s20-2500-kva-35-0-4-kv-high-efficiency-hermetic-distribution-transformer - markdown version: https://voltformer.com/product/tbea-s20-2500-kva-35-0-4-kv-high-efficiency-hermetic-distribution-transformer.md

## Overview

TBEA S20 Series 2500 kVA 35/0.4 kV High-Efficiency Hermetic Distribution Transformer is intended for 2.5 MVA High-Power Oil-Immersed Hermetic Distribution. Configured electrical data: 2500 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. 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:** 2.5 MVA High-Power Oil-Immersed Hermetic Distribution
- **Target industries:** Gigafactories & Mega Plants, Ports & Mining Sites, Large Industrial Zone Plots
- **Brand:** [TBEA (Tebian Electric Apparatus)](https://voltformer.com/brand/tbea-energy.md) - TBEA, one of the world's largest transformer manufacturers, delivers world-leading engineering from 1000 kV UHV AC/DC power transformers to SCB18 cast-resin dry-type, S20/S22 ultra-low-loss hermetic a
- **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 | 2500 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 | 1.55 kW |
| Load loss Pk | 16.0 kW |
| Calculated efficiency (power factor = 1) | 99.3% at 100% load; 99.56% at 50% load |
| Loss class | Ecodesign Tier 2 |
| Windings | Copper (Cu-Cu) - cooling: ONAN - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 57 dB(A) |
| Mass and dimensions | 6800 kg - 2350×1450×2300 mm |
| Enclosure | IP54 - wheel gauge: 1070 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
- TS EN 50708 series
- EU 548/2014 + 2019/1783 Tier 2

## Accessories

**Included:** DGPT2 Integrated Relay, Magnetic Oil Gauge, Relief Valve
**Optional:** PT100 Temperature Sensors, Cable Box

## Official sources

- https://en.tbea.com/product_list/48.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 (On Request) - Indicative range: $34,000 – $39,500 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-TBEA-S20-2500-35","quantity":1}]}
```

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