500kV Oil-Immersed One-Phase Two-Winding Power Transformer

Our 500kV single-phase modular transformers are engineered for EHV substations and power plants requiring high redundancy and flexible deployment.

• Modular redundancy: Single-phase configuration enables rapid standby replacement and temporary two-phase operation, maximizing system availability.

• Logistics optimized: Simplified transport eliminates bottlenecks in mountainous, remote, or access-restricted project sites.

• Wide electrical adaptability: ±2×2.5% off-circuit tapping range and LV options from 13.8 kV to 27 kV accommodate diverse grid and generation requirements.

• Energy efficient: No-load current as low as 0.12% with optimized losses reduces lifecycle operating costs.

• Robust & standardized: Short-circuit impedance of 14%–18% ensures system stability; complete capacity range from 100 MVA to 484 MVA enables precise project matching.

Core Positioning

This product series comprises highly reliable, flexibly deployable single-phase modular power transformers designed for extra-high voltage transmission systems and large-scale power generation applications. It fulfills high-capacity power conversion requirements at the 500kV voltage level, and is particularly suitable for large hub substations and power plants with demanding transportation constraints, high redundancy requirements, or special connection schemes.

Technical Specifications

(MVA) Rated Capacity	Rated Voltage and Tapping Range			Vector Group	No Load Current (%)	Short-circuit Impedance (%)	No load Losses (kW)	On load Losses (kW)
(MVA) Rated Capacity	HV (kv)	Tapping Range	LV (kv)	Vector Group	No Load Current (%)	Short-circuit Impedance (%)	No load Losses (kW)	On load Losses (kW)
100	500/ √3 525/ √3 535/ √3 550/ √3	±2×2.5	13.8,15.75	li0	0.16	14	34	203
120			15.75,18,20		15		39	234
200			15.75,18,20,24		0.12		63	342
223			18		0.12		68	371
240			18,20,24		0.12		72	392
260			18,20		0.12		77	414
380			24,27		0.12	16/18	102	549
400					0.12		106	570
410					0.12		108	581
484					0.12		123	657

Core Advantages and Features

1. Flexible Deployment and High Reliability:

- Employs a single-phase modular design, facilitating transportation, installation, and on-site assembly. Especially advantageous for projects in mountainous, remote, or other locations with challenging access.

- In the event of a single-unit failure, a standby phase can be rapidly activated, or temporary "two-phase operation" can be implemented, ensuring exceptionally high system power supply redundancy and availability.

2. Excellent Electrical Performance:

- High-Voltage Side: Standard phase voltages cover (500/√3) kV to (550/√3) kV, compatible with system line voltages from 500kV to 550kV. Features a wide off-circuit tap-changing range of ±2×2.5% to accommodate grid voltage fluctuations.

- Low-Voltage Side: Offers multiple voltage options from 13.8kV to 27kV to meet various distribution voltage requirements.

- Low-Loss Design: No-load current is as low as 0.12%-0.16%. Both no-load and load losses are optimized, ensuring outstanding life cycle energy efficiency.

- Standardized Impedance: Short-circuit impedance is appropriately designed (14%-18%), effectively limiting short-circuit currents and ensuring system stability.

3. Standardization and Compatibility:

- Utilizes the Ii0 standard vector group. As single-phase units, they can be flexibly combined to form three-phase transformer banks, accommodating various system connection schemes.

- The capacity series ranges from 100 MVA to 484 MVA, providing a complete gradient for easy project selection and capacity matching.

Products Description

Single-phase main transformers for 500kV EHV substations (typically used in banks of three).

Generator step-up transformers for large-scale hydroelectric and thermal power plants.

Core modules for mobile substations or emergency backup transformers.

Power projects in special geographical environments with stringent transportation size limitations.

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