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66kV Power Transformer

Built on a foundation of cutting-edge technology and global industry insights, our power transformers are designed to deliver unmatched reliability and efficiency. By utilizing sophisticated simulation software and proprietary validation protocols, we optimize the entire unit—from core and coils to the tank and leads—for maximum durability.

Category: Power Transformers

Rating kVA:

5 MVA – 300 MVA

Voltage ratings:

Up to 110 kV

Complant With Standard:

info@tgtpower.com

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Fan Designed for both natural and forced air cooling.In ONAF mode, the fan-assisted cooling significantly enhances heat dissipation, ensuring reliable performance under higher loads and demanding conditions.

Control Cabinet Engineered for precise monitoring and control, ensuring accurate operation, fast response, and reliable system performance.

On-load Tap Changer Equipped with premium Huaming or MR brands, ensuring precise voltage regulation, high reliability, and proven long-term performance.

Radiator In-house welded for superior sealing, strength, and reliable heat dissipation.

Winding Precisely hand-assembled for superior craftsmanship, ensuring tighter control, enhanced reliability, and consistent performance.

Oil Conservator Ensures stable oil volume by compensating for temperature changes, while minimizing moisture and air contamination to maintain insulation reliability.

Bushing We offer customer-specified bushings, including trusted brands like ABB, to meet diverse project requirements.

Product Description

Commodity name: 66kV Power Transformer
Rating kVA: 5 MVA – 300 MVA
Voltage ratings: Up to 110 kV

TGTpower 66kV power transformers deliver unwavering stability, maximized uptime, and optimal energy efficiency for large-scale transmission substations, public utilities, and mega-scale renewable generation basins. Calculated and cross-validated up to 720MVA capacity, these (grid-level) core assets features zero-tolerance partial discharge profiles and extreme dynamic short-circuit tolerance. Fully compliant with ANSI/IEEE C57, NEMA, and IEC 60076 standards, our substations power systems are fully certified by KEMA, IEC, and ISO 9001.

Key Features

Optimized Design

Full-scale simulation ensures superior electrical and mechanical performance.

Premium Construction

Efficient manufacturing with elite material selection results in a compact, lightweight, and low-noise unit.

Operational Excellence

Industry-low partial discharge and loss levels contribute to significant energy savings and reduced running costs.

Sustainable & Reliable

Engineered for environmental protection and long-term stability in demanding environments.

Applications

Perfectly suited for power generation, grid substations, and heavy industrial mineralization projects. Proven performance that exceeds expert standards and user expectations.

Technical Data for 66kV power transformer three phase double-winding(NLTC)

Rated Capacity (kVA)	Rated voltage and tapping range			Vector group	No load current (%)	Short-circuit impedance（%）	No load Losses (W)	On load Losses (W)
Rated Capacity (kVA)	HV（kV）	Tapping range（%）	LV（kV）	Vector group	No load current (%)	Short-circuit impedance（%）	No load Losses (W)	On load Losses (W)
6300	63 66 69	±41.25 ±61.25 ±8*1.25	6.3 6.6 10.5	YNd11	0.48	9	4400	30800
8000					0.48		5300	36500
10000					0.45		6200	43000
12500					0.45		7400	51100
16000					0.42		8900	62800
20000					0.42		10600	76100
25000					0.38		12500	90000
31500					0.35		14800	108000
40000					0.35		17700	126900
50000					0.32	10-12	20900	150300
63000					0.29	10-12	24700	178200

Technical Data for 66kV power transformer three phase double-winding(OLTC)

Rated Capacity (kVA)	Rated voltage and tapping range			Vector group	No load current (%)	Short-circuit impedance（%）	No load Losses (W)	On load Losses (W)
Rated Capacity (kVA)	HV（kV）	Tapping range（%）	LV（kV）	Vector group	No load current (%)	Short-circuit impedance（%）	No load Losses (W)	On load Losses (W)
3150	63 66 69	±5	6.3 6.6 10.5	YNd11	0.70	8	2200	20700
4000					0.64		2600	24600
5000					0.54		3100	27600
6300					0.48	9	4000	30800
8000					0.48		4900	36500
10000					0.45		5800	43000
12500					0.45		6800	51100
16000					0.42		8300	62800
20000					0.42		9700	76100
25000					0.38		11400	90000
31500					0.35		13500	108000
40000					0.35		16200	126900
50000					0.32		19400	150300
63000					0.29		22900	178200

Certification Certificate

TGTpower Power Transformers Project Application

Mega-Scale Grid Interconnection

Deployed as primary step-up substation units up to 720MVA capacity, seamlessly synchronizing bulky electricity output from multi-GW wind and solar generation fields into high-voltage continental transmission grids.

Heavy Industrial Continuous Operations

Serves massive aluminum smelting foundries, automotive assembly complexes, and deep mining projects, providing uncompromised dynamic voltage correction and short-circuit impact ruggedness under severe inductive cyclic shifting.

Thermal & Hotspot Longevity

Validated via advanced core fluid dynamics, these field assets permanently eliminate internal thermal hot spots, ensuring zero-overheating insulation degradation in harsh high-altitude utility basins and arid desert project terrains.

Risk-Free Turn-Key Commissioning

Every project tracking phase integrates dual-language CAD engineering validation, positive-pressure nitrogen seaworthy transit, and expert-led on-site re-oil and comprehensive vector-synchronization checks.

Packaging

Positive Pressure Nitrogen Filling:

Shipped fully drained of oil and filled with continuous positive pressure dry nitrogen to permanently isolate the internal core from intercontinental ocean humidity.

Welded Heavy Steel Skid Bases:

Shock-stabilized onto heavy steel frames and block-welded directly into the lift vessel's cargo hold to fully absorb sea swells and low-frequency hull vibrations.

Independent Protective Timber Caging:

Crucial capacitor-type bushings, radiator panels, and oil conservator tanks are disassembled and secured within custom foam-lined, heavy solid timber crates.

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110kV Power Transformer