# Siemens Energy 50 MVA 132/33 kV Substation Step-Down Power Transformers (110-330 kV)

> Siemens Energy 50 MVA 132/33 kV no-load tap changer (NLTC) utility substation step-down transformer.

> SKU: VF-SIE-NLTC-50M-132 | Brand: Siemens Energy | Category: Power & Energy Equipment / Transformers / High-Voltage & Transmission Power Transformers / Substation Step-Down Power Transformers (110-330 kV)

**Voltformer canonical:** https://voltformer.com/product/siemens-energy-50-mva-132-33-kv-nltc-step-down-power-transformer - markdown version: https://voltformer.com/product/siemens-energy-50-mva-132-33-kv-nltc-step-down-power-transformer.md

## Overview

Siemens Energy 50 MVA 132/33 kV Substation Step-Down Power Transformers (110-330 kV) is intended for 154 kV National Grid to 34.5 kV Main Step-Down Power Transformer. Configured electrical data: 50 MVA, 132/33 kV primary/secondary voltage, 50 Hz, 3-phase, vector group YNd11 and short-circuit impedance 11.5%. 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:** [Siemens Energy](https://voltformer.com/brand/siemens-energy.md) - The embodiment of German engineering excellence; Siemens Energy sets the industry standard with GEAFOL® cast-resin dry-type transformers, ester-oil network units and transmission-level autotransformer
- **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 | 132 kV / 33 kV (±2 x 2.5% NLTC) |
| Frequency / phases | 50 Hz / 3-phase - YNd11 |
| Short-circuit impedance (Uk) | 11.5% |
| No-load loss P0 | 25.00 kW |
| Load loss Pk | 160.0 kW |
| Calculated efficiency (power factor = 1) | 99.6314% at 100% load; 99.7407% 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 | 62000 kg - 6400×3900×4700 mm |
| Enclosure | IP55 / switchyard outdoor - wheel gauge: 1435 mm |
| LI / AC withstand | 550 kV peak / 230 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://www.siemens-energy.com/global/en/offerings/power-transmission/transformers.html
- https://www.siemensenergy.com/global/en/home/products-services/product-offerings/transformers.html

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

Manufacturer family/application source. Siemens Energy sub-transmission step-down transformers with de-energized / no-load tap changers (NLTC) for regional utility substations requiring economical, ultra-durable transformation. 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-SIE-NLTC-50M-132","quantity":1}]}
```

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