# Iljin Electric 150 MVA 345/161 kV Interconnection & Transmission Autotransformers (345-380 kV)

> Iljin Electric 150 MVA 345/161 kV Interconnection & Transmission Autotransformers (345-380 kV) belongs to the Interconnection & Transmission Autotransformers (345-380 kV) category and is rated at 150 MVA with 345/161 kV primary/secondary voltage. Application: 345 kV / 161 kV Transmission and Interconnection Switchyards. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-ILJ-AUT-150MVA-345 | Brand: Iljin Electric | Category: Power & Energy Equipment / Transformers / High-Voltage & Transmission Power Transformers / Interconnection & Transmission Autotransformers (345-380 kV)

**Voltformer canonical:** https://voltformer.com/product/iljin-150-mva-345-kv-three-phase-transmission-autotransformer - markdown version: https://voltformer.com/product/iljin-150-mva-345-kv-three-phase-transmission-autotransformer.md

## Overview

Iljin Electric 150 MVA 345/161 kV Interconnection & Transmission Autotransformers (345-380 kV) is intended for 345 kV / 161 kV Transmission and Interconnection Switchyards. Configured electrical data: 150 MVA, 345/161 kV primary/secondary voltage, 50 Hz, 3-phase, vector group YNa0+d and short-circuit impedance 11.5%. Construction: Copper (Cu-Cu); cooling: ONAN/ONAF; loss class: IEC 60076 SOTA UHV. 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:** 345 kV / 161 kV Transmission and Interconnection Switchyards
- **Target industries:** National Interconnected Transmission Grids, Bulk Power Transmission Corridors, Nuclear & Thermal Power Generation Step-Up Substations
- **Brand:** [Iljin Electric](https://voltformer.com/brand/iljin-electric.md) - South Korea’s Iljin Electric delivers advanced 765 kV power transformers, 800 kV gas-insulated switchgear (GIS) and turnkey transmission solutions globally.
- **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. / [Interconnection & Transmission Autotransformers (345-380 kV)](https://voltformer.com/category/power-transmission-transformers/interconnected-grid-autotransformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 150 MVA |
| Primary / secondary voltage | 345 kV / 161 kV (±10 x 1.25%) |
| Frequency / phases | 50 Hz / 3-phase - YNa0+d |
| Short-circuit impedance (Uk) | 11.5% |
| No-load loss P0 | 55.00 kW |
| Load loss Pk | 350.0 kW |
| Calculated efficiency (power factor = 1) | 99.73% at 100% load; 99.81% at 50% load |
| Loss class | IEC 60076 SOTA UHV |
| Windings | Copper (Cu-Cu) - cooling: ONAN/ONAF - insulation: Class A (105°C) |
| Temperature rise | 65 K - sound pressure: 67 dB(A) |
| Mass and dimensions | 145000 kg - 8400×4600×6200 mm |
| Enclosure | IP55 - wheel gauge: 1800 mm |
| LI / AC withstand | 1175 kV peak / 510 kV rms - partial discharge: 30 pC |
| Environment | -25°C / +45°C; altitude ≤ 1000 m |
| Core steel | CRGO Laser-Treated Grain-Oriented Silicon Steel (23ZDMH85 / Baosteel B23R085) |
| Bushings / terminals | 345 kV RIP Kondenser Bushing |

## Standards

- IEC 60076
- IEEE C57

## Accessories

**Included:** Configuration-specific technical value, Buchholz Relay, Online DGA Gas Analyzer, Configuration-specific technical value
**Optional:** Configuration-specific technical value, Configuration-specific technical value

## Official sources

- https://www.iljinelectric.co.kr/main

- **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: $1,450,000 – $1,700,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076, IEEE C57. 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-ILJ-AUT-150MVA-345","quantity":1}]}
```

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