# Astor Enerji 50 MVA 154/33.6 kV TEİAŞ Spec Power Transformer (OLTC)

> Astor Enerji 50 MVA 154/33.6 kV TEİAŞ Spec Power Transformer (OLTC) belongs to the Substation Step-Down Power Transformers (110-330 kV) category and is rated at 50 MVA with 154/33.6 kV primary/secondary voltage. Application: TEİAŞ 154 kV Transmission Lines & Regional Step-Down Substations. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-AST-PWR-50M-154K | Brand: Astor Enerji | Category: Power & Energy Equipment / Transformers / High-Voltage & Transmission Power Transformers / Substation Step-Down Power Transformers (110-330 kV)

**Voltformer canonical:** https://voltformer.com/product/astor-enerji-50-mva-154-33-6-kv-tei-as-spec-power-transformer-oltc - markdown version: https://voltformer.com/product/astor-enerji-50-mva-154-33-6-kv-tei-as-spec-power-transformer-oltc.md

## Overview

Astor Enerji 50 MVA 154/33.6 kV TEİAŞ Spec Power Transformer (OLTC) is intended for TEİAŞ 154 kV Transmission Lines & Regional Step-Down Substations. Configured electrical data: 50 MVA, 154/33.6 kV primary/secondary voltage, 50 Hz, 3-phase, vector group YNd11 and short-circuit impedance 10.5%. Construction: Copper (Cu-Cu); cooling: ONAN/ONAF; loss class: Configuration-specific loss class. 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:** TEİAŞ 154 kV Transmission Lines & Regional Step-Down Substations
- **Target industries:** Regional Transmission Substations, Mega Industrial Zone Main Infeeds, Steel Manufacturing Works
- **Brand:** [Astor Enerji](https://voltformer.com/brand/astor-enerji.md) - Turkey's transformer production giant Astor Enerji manufactures oil-immersed hermetic, cast-resin dry-type and power transformers up to 800 kV in its modern 140,000 m² facilities in Ankara ASO 2. OSB,
- **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 | 50 MVA |
| Primary / secondary voltage | 154 kV / 33.6 kV (±10 x 1.25% OLTC) |
| Frequency / phases | 50 Hz / 3-phase - YNd11 |
| Short-circuit impedance (Uk) | 10.5% |
| No-load loss P0 | 24.00 kW |
| Load loss Pk | 165.0 kW |
| Calculated efficiency (power factor = 1) | 99.62% at 100% load; 99.74% at 50% load |
| Loss class | Configuration-specific loss class |
| Windings | Copper (Cu-Cu) - cooling: ONAN/ONAF - insulation: Class A |
| Temperature rise | 65 K - sound pressure: 64 dB(A) |
| Mass and dimensions | 68000 kg - 5900×3700×5200 mm |
| Enclosure | IP55 - wheel gauge: 1600 mm |
| LI / AC withstand | 650 kV peak / 275 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

- TEİAŞ technical specification
- IEC 60076
- TS EN 60076

## Accessories

**Included:** Reinhausen Vacuum OLTC, Buchholz Gas Relay, Oil Level Indicator
**Optional:** DGA Gas Analyzer

## Official sources

- https://astoras.com.tr/

- **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: $420,000 – $495,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: TEİAŞ technical specification, IEC 60076, 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-AST-PWR-50M-154K","quantity":1}]}
```

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