# Končar D&ST 40 MVA 110/20 kV Substation Step-Down Power Transformers (110-330 kV)

> Končar D&ST 40 MVA 110/20 kV Substation Step-Down Power Transformers (110-330 kV) belongs to the Substation Step-Down Power Transformers (110-330 kV) category and is rated at 40 MVA with 110/20 kV primary/secondary voltage. Application: 110 kV Regional Step-Down Substations. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-KON-PWR-40MVA-110 | Brand: Končar D&ST | Category: Power & Energy Equipment / Transformers / High-Voltage & Transmission Power Transformers / Substation Step-Down Power Transformers (110-330 kV)

**Voltformer canonical:** https://voltformer.com/product/koncar-40-mva-110-kv-high-voltage-power-transformer - markdown version: https://voltformer.com/product/koncar-40-mva-110-kv-high-voltage-power-transformer.md

## Overview

Končar D&ST 40 MVA 110/20 kV Substation Step-Down Power Transformers (110-330 kV) is intended for 110 kV Regional Step-Down Substations. Configured electrical data: 40 MVA, 110/20 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: 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:** 110 kV Regional Step-Down Substations
- **Target industries:** Regional 110 kV Transmission Grids, Wind & Solar Renewable Parks, Industrial Zone Step-Down Substations
- **Brand:** [Končar D&ST](https://voltformer.com/brand/koncar-dst.md) - European transformer leader Končar D&ST manufactures high-efficiency power transformers, Ecodesign Tier 2 cast-resin dry-type units and railway traction transformers for global transmission grids.
- **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 | 40 MVA |
| Primary / secondary voltage | 110 kV / 20 kV (±8 x 1.25% OLTC) |
| Frequency / phases | 50 Hz / 3-phase - YNd11 |
| Short-circuit impedance (Uk) | 10.5% |
| No-load loss P0 | 19.00 kW |
| Load loss Pk | 125.0 kW |
| Calculated efficiency (power factor = 1) | 99.64% at 100% load; 99.75% at 50% load |
| Loss class | Ecodesign Tier 2 |
| Windings | Copper (Cu-Cu) - cooling: ONAN/ONAF - insulation: Class A (105°C) |
| Temperature rise | 65 K - sound pressure: 63 dB(A) |
| Mass and dimensions | 51000 kg - 5600×3300×4500 mm |
| Enclosure | IP55 - wheel gauge: 1500 mm |
| LI / AC withstand | 550 kV peak / 230 kV rms - partial discharge: 50 pC |
| Environment | -25°C / +45°C; altitude ≤ 1000 m |
| Core steel | CRGO Laser-Treated Grain-Oriented Silicon Steel (23ZDMH85 / Baosteel B23R085) |
| Bushings / terminals | Configuration-specific technical value |

## Standards

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

## Accessories

**Included:** Configuration-specific technical value, Buchholz Relay, Configuration-specific technical value, Configuration-specific technical value
**Optional:** Configuration-specific technical value, Fiber Optic Temperature Probes

## Official sources

- https://www.koncar-dst.hr/

- **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: $460,000 – $540,000 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 60076, 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-KON-PWR-40MVA-110","quantity":1}]}
```

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