# TBEA 50 MVA 220/10.5 kV Power Plant Auxiliary Service Transformer

> TBEA 50 MVA 220/10.5 kV heavy-duty power plant auxiliary service transformer.

> SKU: VF-TBEA-AUX-50M-220 | Brand: TBEA | Category: Power & Energy Equipment / Transformers / Distribution Transformers / Oil-Immersed Conservator Transformers

**Voltformer canonical:** https://voltformer.com/product/tbea-50-mva-220-10-5-kv-power-plant-auxiliary-transformer - markdown version: https://voltformer.com/product/tbea-50-mva-220-10-5-kv-power-plant-auxiliary-transformer.md

## Overview

TBEA 50 MVA 220/10.5 kV Power Plant Auxiliary Service Transformer is intended for 154 kV National Grid to 34.5 kV Main Step-Down Power Transformer. Configured electrical data: 50 MVA, 220/10.5 kV primary/secondary voltage, 50 Hz, 3-phase, vector group YNd11 and short-circuit impedance 14%. Construction: Copper (Cu-Cu); cooling: ONAN/ONAF; 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:** 154 kV National Grid to 34.5 kV Main Step-Down Power Transformer
- **Target industries:** National Transmission Grid Network, Major Power Plants (Hydro & Wind), Mega Industrial Zone Grid Infeeds
- **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 Conservator Transformers](https://voltformer.com/category/distribution-transformers/oil-immersed-conservator-tank-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 50 MVA |
| Primary / secondary voltage | 220 kV / 10.5 kV (±8 x 1.25% (OLTC on-load tap-changing)) |
| Frequency / phases | 50 Hz / 3-phase - YNd11 |
| Short-circuit impedance (Uk) | 14% |
| No-load loss P0 | 28.00 kW |
| Load loss Pk | 165.0 kW |
| Calculated efficiency (power factor = 1) | 99.6155% at 100% load; 99.7238% at 50% load |
| Loss class | Ecodesign Tier 2 |
| Windings | Copper (Cu-Cu) - cooling: ONAN/ONAF - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 68 dB(A) |
| Mass and dimensions | 68000 kg - 6800×4100×5100 mm |
| Enclosure | IP55 / switchyard outdoor - wheel gauge: 1435 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 series
- TEİAŞ technical specification
- TS EN 60076
- KEMA & CESI type-test approved

## Accessories

**Included:** Vacuum On-Load Tap Changer (MR Reinhausen / TBEA OLTC), Buchholz Relay, Winding & Oil Temperature Indicators, Pressure Relief Device, Silica Gel Dehydrating Breather
**Optional:** Online DGA 8-Gas Dissolved Gas Analyzer, Fiber Optic Temperature Measurement System, Automatic Fire Suppression System

## Official sources

- https://en.tbea.com/
- https://en.tbea.com/product_list/48.html

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

Manufacturer family/application source. TBEA power plant auxiliary transformers supply critical station service buses in large thermal and nuclear plants. Final voltage ratios, short-circuit withstand and accessories must be verified against plant requirements. Exact order code, guaranteed losses, dimensions, insulation level, cooling stage, winding material and project options must be confirmed with the OEM before procurement or an SLD study.

## Pricing & Logistics

- Pricing type: RFQ (On Request) - Indicative range: $420,000 – $510,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076 series, TEİAŞ technical specification, TS EN 60076, KEMA & CESI type-test approved. 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-AUX-50M-220","quantity":1}]}
```

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