# DAIHEN Corporation 1000 kVA 6.6/0.4 kV Oil-Immersed Hermetic Distribution Transformers

> DAIHEN Corporation 1000 kVA 6.6/0.4 kV Oil-Immersed Hermetic Distribution Transformers belongs to the Oil-Immersed Hermetic Distribution Transformers category and is rated at 1000 kVA with 6.6/0.4 kV primary/secondary voltage. Application: Energy Distribution Grids with Ultra-Low No-Load Losses. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-DAI-AMR-1000-66 | Brand: DAIHEN Corporation | Category: Power & Energy Equipment / Transformers / Distribution Transformers / Oil-Immersed Hermetic Distribution Transformers

**Voltformer canonical:** https://voltformer.com/product/daihen-super-eco-1000-kva-6-6-kv-amorphous-distribution-transformer - markdown version: https://voltformer.com/product/daihen-super-eco-1000-kva-6-6-kv-amorphous-distribution-transformer.md

## Overview

DAIHEN Corporation 1000 kVA 6.6/0.4 kV Oil-Immersed Hermetic Distribution Transformers is intended for Energy Distribution Grids with Ultra-Low No-Load Losses. Configured electrical data: 1000 kVA, 6.6/0.4 kV primary/secondary voltage, 50 Hz, 3-phase, vector group Dyn11 and short-circuit impedance 5%. Construction: Copper (Cu-Cu); cooling: ONAN; loss class: JIS Top Runner / Amorphous Ultra Low Loss. 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:** Energy Distribution Grids with Ultra-Low No-Load Losses
- **Target industries:** Japan & Asia Power Distribution Networks, Compact Kiosk & Pole-Mounted Distribution Substations, Energy Efficiency-Driven Industrial Plants
- **Brand:** [DAIHEN Corporation](https://voltformer.com/brand/daihen-corporation.md) - Japanese power pioneer DAIHEN Corporation engineers ultra-low loss amorphous alloy distribution transformers and compact pad-mounted substations with century-long reliability.
- **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 Hermetic Distribution Transformers](https://voltformer.com/category/distribution-transformers/oil-immersed-hermetic-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 1000 kVA |
| Primary / secondary voltage | 6.6 kV / 0.4 kV (±2 x 2.5%) |
| Frequency / phases | 50 Hz / 3-phase - Dyn11 |
| Short-circuit impedance (Uk) | 5% |
| No-load loss P0 | 390 W |
| Load loss Pk | 7.8 kW |
| Calculated efficiency (power factor = 1) | 99.19% at 100% load; 99.53% at 50% load |
| Loss class | JIS Top Runner / Amorphous Ultra Low Loss |
| Windings | Copper (Cu-Cu) - cooling: ONAN - insulation: Class A (105°C) |
| Temperature rise | 60 K - sound pressure: 51 dB(A) |
| Mass and dimensions | 3600 kg - 1850×1200×1800 mm |
| Enclosure | IP55 hermetic - wheel gauge: 1070 mm |
| LI / AC withstand | 60 kV peak / 22 kV rms - partial discharge: 5 pC |
| Environment | -20°C / +40°C; altitude ≤ 1000 m |
| Core steel | Amorphous Alloy Metal Ribbon (1K101 Fe-Si-B High Permeability) |
| Bushings / terminals | Configuration-specific technical value |

## Standards

- IEC 60076
- JIS C 4304
- IEEE C57

## Accessories

**Included:** Pressure Relief Safety Valve, Magnetic Oil Level Indicator, Thermometer Pocket
**Optional:** Configuration-specific technical value, Configuration-specific technical value

## Official sources

- https://www.daihen.co.jp/en/

- **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: $21,500 – $25,500 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 60 months
- Compliance candidates: IEC 60076, JIS C 4304, 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-DAI-AMR-1000-66","quantity":1}]}
```

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