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

500kV Single-Phase Modular Power Transformer.

Engineered for EHV substations and power plants requiring high redundancy.

Rated 100 to 484 MVA, HV 500-550kV, LV 13.8-27kV.

Features ±2×2.5% taps, II0 vector group, and optimized losses (no-load 0.12%) for maximum system availability.

Product Overview

This series comprises highly reliable, flexibly deployable single-phase modular transformers designed for 500kV EHV transmission and generation.

Utilizing a single-phase modular design, it addresses demanding transportation constraints in mountainous or remote sites, while providing high redundancy for large hub substations and power plants.

modular-transformer-transport-and-installationjpg

Modular transport and fast on-site assembly solve remote site bottlenecks.

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

500kV-transformer-internal-structure-windingsjpg

Internal copper winding and core structure ensuring high efficiency.

Core Advantages

Modular Redundancy & Fast Recovery: Single-phase configuration enables rapid standby replacement and temporary "two-phase operation" in emergencies. Maximizes system availability and prevents total grid shutdown.
Logistics Optimized: Simplified transport eliminates bottlenecks in mountainous, remote, or access-restricted project sites. Save massive time and crane costs on-site.
Wide Electrical Adaptability: HV covers 500-550kV with ±2×2.5% off-circuit tapping. LV options from 13.8kV to 27kV accommodate diverse generation and grid requirements.
High Efficiency & Robustness: Short-circuit impedance (14%-18%) ensures system stability. No-load current as low as 0.12% reduces lifecycle operating costs. II0 vector group allows flexible combination into three-phase banks.

500kV-single-phase-power-transformer-substation

Engineered for harsh EHV substation environments in mountainous regions.

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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