# TBEA 1250 kVA 6 kV / 1.14 kV Underground Mining Flameproof (Ex-Proof) Dry-Type Transformer

> TBEA 1250 kVA 6 kV / 1.14 kV Underground Mining Flameproof (Ex-Proof) Dry-Type Transformer belongs to the Mining & Flameproof (Ex-Proof) category and is rated at 1250 kVA with 6/1.14 kV primary/secondary voltage. Application: Underground Methane-Gassy Coal Mine Mobile Substation. Final ratings must be verified against the manufacturer datasheet.

> SKU: VF-TBEA-MIN-1250-6 | Brand: TBEA (Tebian Electric Apparatus) | Category: Power & Energy Equipment / Transformers / Special Industrial & Process Transformers / Mining & Flameproof (Ex-Proof)

**Voltformer canonical:** https://voltformer.com/product/tbea-1250-kva-6-kv-1-14-kv-underground-mining-flameproof-ex-proof-dry-type-transformer - markdown version: https://voltformer.com/product/tbea-1250-kva-6-kv-1-14-kv-underground-mining-flameproof-ex-proof-dry-type-transformer.md

## Overview

TBEA 1250 kVA 6 kV / 1.14 kV Underground Mining Flameproof (Ex-Proof) Dry-Type Transformer is intended for Underground Methane-Gassy Coal Mine Mobile Substation. Configured electrical data: 1250 kVA, 6/1.14 kV primary/secondary voltage, 50 Hz, 3-phase, vector group Dyn11 and short-circuit impedance 4.5%. Construction: Copper (Cu-Cu); cooling: AN (Naturally Air-Cooled Armored Tank); 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:** Underground Methane-Gassy Coal Mine Mobile Substation
- **Target industries:** Underground Coal & Lignite Mines, Metal Ore Mines, TBM Tunnel Construction Works
- **Brand:** [TBEA (Tebian Electric Apparatus)](https://voltformer.com/brand/tbea-energy.md) - TBEA, one of the world's largest transformer manufacturers, delivers world-leading engineering from 1000 kV UHV AC/DC power transformers to SCB18 cast-resin dry-type, S20/S22 ultra-low-loss hermetic a
- **Category:** [Power & Energy Equipment](https://voltformer.com/catalog.md) / **Transformers** / [Special Industrial & Process Transformers](https://voltformer.com/category/special-industrial-process-transformers.md): Arc furnace (EAF), green hydrogen electrolyser, rectifier, traction and mining Ex-proof transformers. / [Mining & Flameproof (Ex-Proof)](https://voltformer.com/category/special-industrial-process-transformers/mining-flameproof-ex-proof-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 1250 kVA |
| Primary / secondary voltage | 6 kV / 1.14 kV (±2 x 2.5%) |
| Frequency / phases | 50 Hz / 3-phase - Dyn11 |
| Short-circuit impedance (Uk) | 4.5% |
| No-load loss P0 | 1.85 kW |
| Load loss Pk | 11.8 kW |
| Calculated efficiency (power factor = 1) | 98.92% at 100% load; 99.24% at 50% load |
| Loss class | Configuration-specific loss class |
| Windings | Copper (Cu-Cu) - cooling: AN (Naturally Air-Cooled Armored Tank) - insulation: Class H (180°C) |
| Temperature rise | 100 K - sound pressure: 62 dB(A) |
| Mass and dimensions | 6200 kg - 3200×1250×1450 mm |
| Enclosure | IP55 / Ex d I Mb (flameproof) - wheel gauge: 600 mm |
| LI / AC withstand | 60 kV peak / 20 kV rms - partial discharge: 5 pC |
| Environment | -40°C / +50°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 60079-0 / 60079-1 (explosive atmosphere Ex-d)
- IEC 60076-11
- ATEX

## Accessories

**Included:** Flameproof Steel Enclosure (Ex d), Built-in MV Vacuum Circuit Breaker, LV Residual Current & Insulation Protection
**Optional:** Mining SCADA / RS485 Flameproof Comms Module

## Official sources

- https://en.tbea.com/product_list/48.html

- **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: $42,000 – $49,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60079-0 / 60079-1 (explosive atmosphere Ex-d), IEC 60076-11, ATEX. 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-TBEA-MIN-1250-6","quantity":1}]}
```

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