6–11kV Level 1 Oil Distribution Transformer

6-11kV Oil Distribution Transformer

Low-loss, UL/CE/CCC certified oil-immersed transformer for 6kV to 11kV grid distribution

Overview

Key Applications

Why Choose？

Engineering

Technical Specifications

Customization

Support

Overview

The TSTY 6–11kV oil-immersed distribution transformer steps down medium-voltage (6–11kV) to 0.4kV for safe, efficient end-user power delivery in secondary distribution networks. Available from 15kVA to 3150kVA, it meets Level 1 energy efficiency standards and is certified for major global markets—including North America, Europe, and Russia/CIS.
Ideal for medium-to-low load density areas, this transformer minimizes line losses over long distances and operates reliably in harsh environments, from –40°C cold zones to coastal salt-spray regions.

Key Applications

Commonly specified for utility upgrades and industrial substations where reliability, low maintenance, and global certification are critical.

Urban and rural grid modernization

Industrial facilities and mining operations

Commercial complexes and residential districts

Railway electrification systems

Distributed renewable energy projects (solar, biomass microgrids)

Remote or off-grid communities requiring durable, low-maintenance infrastructure

Why Choose 6–11kV oil distribution transformer?

All units feature 100% copper windings, premium mineral insulating oil, and corrosion-resistant galvanized hardware for 30+ years of outdoor service life.

Energy-efficient design

Complies with GB 20052-2020 Level 1 standard—up to 20% lower no-load loss than S11 models

Extreme-environment resilience

Field-proven in Mongolia (–40°C), Saudi Arabia (70°C), Southeast Asian coasts, and high-humidity zones

Zero-leakage construction

Grooved porcelain bushings shield gaskets from UV aging; double-sealed tap changer eliminates oil leakage during installation and service

Low-noise performance

Acoustic levels below national limits—suitable for installations near residential or commercial areas

Proven reliability

Oil-paper insulation system ensures stable dielectric strength and decades of maintenance-free operation

Engineering & Global Compliance

Every TSTY oil-immersed distribution transformer integrates advanced manufacturing with internationally recognized quality and safety frameworks:

Certified to major international standards

• Safety & Market Access: UL (North America), CE (Europe), CCC (China), EAC & GOST (Russia/CIS)
• Technical Performance: IEC 60076 series
• Quality Management: ISO 9001

Premium materials

H62 brass conductive rods, Baosteel high-permeability oriented silicon steel, acrylic rubber gaskets (oil/UV/oxidation resistant), galvanized bolts (30-year rust protection)

Digital production

95% automated core and winding process; vacuum drying and oil injection ensure bubble-free insulation

Rigorous testing

Every unit undergoes lightning impulse test, temperature rise test, no-load loss measurement, and load loss measurement in our CNAS-accredited laboratory.

Technical Specifications

Standard configurations for 30–2500kVA 6–11kV oil-immersed transformers

30-2500kVA 6-11kV Oil-Immersed Transformer

Rated Capacity (KVA)	Voltage Combination			Vector Group	No-Load Loss(W)	Load Loss	No-Load Current (%)	Short Circuit Impedance (%)
Rated Capacity (KVA)	High Voltage (KV)	Tapping Range	Low Voltage (KV)	Vector Group	No-Load Loss(W)	Load Loss	No-Load Current (%)	Short Circuit Impedance (%)
30	11	±5%	0.4	Dyn	130	630	2.1	4
50					170	910	2
63					200	1090	1.9
80					250	1310	1.8
100					290	1580	1.6
125	10.5 10 6.3 6	±2×2.5%			340	1890	1.5
160					400	2310	1.4
200					480	2730	1.3
250					560	3200	1.2
315					670	3830	1.1
400					800	4520	1
500					960	5410	1
630					1200	6200	0.9	4.5
800					1400	7500	0.8
1000					1700	10300	0.7
1250					1950	12000	0.6
1600					2400	14500	0.6
2000					2850	19500	0.6	5
2500	10		0.4	Dyn	300	21200	0.6	5

*Standard vector group: Dyn11. Custom configurations (e.g., Yyn0, special taps, noise-reduction design) available upon request.

Customization & Optional Features

Every TSTY oil-immersed transformer is built to order. Standard units comply with IEC 60076, while optional features are factory-integrated and fully tested:

Tank & Finish

Galvanized steel (standard) or stainless steel; custom color available

Oil Conservator

With or without oil pillow—select based on maintenance strategy

Tap Changer

Off-circuit (standard) or on-load tap changer (OLTC) for uninterrupted regulation

Sealing & Mobility

Fully sealed enclosure for maintenance-free operation; optional casters for easy on-site positioning

Monitoring Accessories

Winding Temperature Indicator (WTI), Oil Temperature Indicator (OTI)—with alarm contacts if needed

Dimensions & Labeling

Overall size and mounting layout adjustable; nameplate customizable in English or local language

Performance

No-load and load losses customizable to meet specific efficiency targets (e.g., S20, S22)

Support & Documentation

IEC-compliant datasheets and one-line diagrams

Full type-test reports (lightning impulse, etc.)

Installation, operation & maintenance manuals

Regional technical support: 24/7 engineering assistance + spare parts hubs in Asia, Africa, and the Middle East

6–11kV Level 1 Oil Distribution Transformer | TSTY

Resource

6–11kV Level 1 Oil Distribution Transformer | TSTY

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