63/66kV Oil-Immersed Transformer up to 40000kVA | TSTY

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66kV Oil-immersed Transformer
66kV Oil-immersed Transformer

High-capacity, IEC/GOST certified oil-immersed transformer for 63/66kV sub-transmission and heavy industrial power supply

Overview
Key Applications
Why Choose？
Engineering
Technical Specifications
Customization
Support
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Overview
The TSTY 63/66kV oil-immersed transformer serves as a critical hub connecting 220kV main grids to regional distribution networks or large-scale load terminals, stepping down voltage to 10/20kV or directly to 0.4kV.
Engineered for high-load, long-distance transmission, it supports capacities up to 40,000kVA and is designed for large industrial parks, renewable energy collection stations, high-voltage mines, and petrochemical bases. Unlike lower-voltage distribution transformers, this unit prioritizes short-circuit withstand capability and compact footprint to meet the demands of sub-transmission infrastructure upgrades.
All units feature reinforced oil-paper insulation, premium mineral insulating oil, and corrosion-resistant galvanized hardware for decades of reliable service in demanding environments.
Key Applications
Commonly specified for projects where high short-circuit strength, compact design, and compliance with 66kV sub-transmission standards are non-negotiable.
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220/66kV regional substations and grid expansion projects
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Large-scale industrial parks and heavy manufacturing bases
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Wind/solar farm collection stations and grid interconnection points
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High-voltage mining operations and mineral processing plants
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Petrochemical refineries with continuous process loads
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Long-distance rural electrification and remote industrial sites
Why Choose 63/66kV Oil-immersed Distribution Transformer?
All units feature 100% copper windings, premium mineral insulating oil, and corrosion-resistant galvanized hardware for decades of reliable service.
Short-circuit withstand resilience

Reinforced winding clamping and low-impedance design enable the unit to endure severe fault currents without mechanical deformation, ensuring stability during grid contingencies.
Compact sub-transmission footprint

Optimized core-winding geometry reduces overall dimensions by 15% compared to conventional 66kV designs, simplifying transport logistics and saving valuable substation space.
Grid-code adaptive performance

Factory-tuned impedance and tap ranges align with local utility requirements for voltage regulation, harmonic tolerance, and reactive power support in modernized networks.
Long-cycle operational reliability

Mature oil-paper insulation system with enhanced moisture barriers extends service life beyond 30 years, minimizing unplanned outages in mission-critical facilities.
Low-loss economic operation

No-load and load losses optimized for sub-transmission duty cycles reduce annual operating costs while maintaining acoustic levels below national limits for noise-sensitive sites.

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Engineering & Global Compliance
Every TSTY 63/66kV oil-immersed transformer integrates advanced manufacturing with internationally recognized quality and safety frameworks:
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Sub-transmission design validation

Engineers perform electromagnetic field simulation and short-circuit force calculation specific to 66kV class equipment, verifying structural integrity before production rather than relying on scaled-up distribution designs.

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Critical component qualification

Bushings, tap changers, and insulating oils undergo type testing per IEC 60137/60214/60296 standards; supplier audits confirm batch consistency for components rated above 35kV.

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66kV-class dielectric assurance

Each unit completes induced voltage withstand test with partial discharge measurement at 1.5× rated voltage, confirming insulation coordination for sub-transmission overvoltage profiles.

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Site-condition performance verification

Units are validated against project-specific altitude, ambient temperature, and seismic zone data to guarantee rated capacity under actual installation conditions, not just standard reference values.

Technical Specifications
Standard configurations for 2,500–40,000kVA 63/66kV oil-immersed distribution transformers
63/66KV Oil-immersed Distribution Transformer

Rated capacity
(kVA)

high Voltage
(kV)

Tap range

low voltage
(kV)

Connection Group

No-load loss
(kW)

Load loss
(kW)

No-load current
(%)

Impedance voltage(%)

2000

60
63
66

±8×1.25%

6.3
6.6
10.5
11

YNd11

1.8

14.7

0.3

8.0

2500

2.1

17.4

0.3

3150

2.4

20.7

0.3

4000

3.1

24.6

0.3

5000

3.7

27.6

0.3

6300

4.4

30.8

0.3

9.0

8000

5.3

36.5

0.3

10000

6.2

43.0

0.3

12500

7.4

51.1

0.3

16000

8.9

62.8

0.3

20000

10.6

76.1

0.3

25000

12.5

90.0

0.3

31500

14.8

108.0

0.3

40000

17.7

126.9

0.3

50000

20.9

150.3

0.3

63000

24.7

178.2

0.3

75000

28.2

203.1

0.3

90000

32.3

232.9

0.3

100000

34.9

252.0

0.3

 

*Standard vector group: Dyn11. Custom configurations (e.g., Yyn0, special taps, noise-reduction design) available upon request.
Customization & Optional Features
Every TSTY 63/66kV oil-immersed transformer is built to order. Standard units comply with IEC 60076, while optional features are factory-integrated and fully tested:
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Enclosure material & finish

Galvanized steel for standard outdoor use or stainless steel for coastal/chemical environments; custom RAL color matching available to align with site branding or environmental blending requirements.

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Oil preservation system

Sealed-tank configuration for maintenance-free operation in stable climates, or conservator with nitrogen blanket for high-altitude sites requiring pressure management and moisture exclusion.

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Voltage regulation approach

Off-circuit tap changer for fixed-ratio applications, or on-load tap changer (OLTC) with customized step voltages and position counts to support dynamic grid voltage control; tap ranges adjustable to match utility tolerance bands.

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Transport & installation adaptation

Low-profile tank design with reinforced lifting points for restricted-height transport routes; optional heavy-duty casters and jacking pads for indoor positioning where overhead cranes are unavailable.

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Asset health monitoring

WTI/OTI sensors with analog/digital outputs and alarm/trip contacts for SCADA integration; optional dissolved gas analysis (DGA) monitors for early fault detection in critical sub-transmission assets.

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Loss profile optimization

No-load and load losses tailored to project-specific tariff structures or regulatory efficiency tiers (e.g., S20/S22), balancing capital expenditure against lifecycle operating costs.

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Physical interface customization

Adjustable bushing clearances, mounting hole patterns, and cable entry positions to fit existing foundation footprints; nameplates available in bilingual formats or with QR codes linking to digital documentation.

Support & Documentation
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IEC-compliant datasheets and one-line diagrams
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Full type-test reports (lightning impulse, etc.)
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Installation, operation & maintenance manuals
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Regional technical support: 24/7 engineering assistance + spare parts hubs in Asia, Africa, and the Middle East

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