Generator Step-Up Transformer for Hydro Power Plant-500kV

Attributes Description Documentation Resource Library

Key attributes

Brand	ROCKWILL
Model NO.	Generator Step-Up Transformer for Hydro Power Plant-500kV
Rated frequency	50/60Hz
Series	GSU

Description

840MVA/500kV GSU (Generator Step-Up) transformer for hydroelectric power plants boosts generator low voltage to 500kV for efficient long-distance grid transmission. Designed with moisture-resistant insulation, sealed tank construction, and corrosion-resistant components for demanding hydro environments.

Features low noise operation, 30-year design life, compact powerhouse layout, and grid-compatible voltage regulation for stable integration of clean hydropower into the main grid.

Product Advantages

Moisture-resistant design — Sealed tank structure with moisture-resistant insulation materials prevents water ingress and insulation degradation in humid powerhouse environments
Adaptability to variable loads — Optimized for fluctuating hydropower output (seasonal changes, dam release adjustments) with strong overload capacity for sudden generation surges
Compact powerhouse layout — Space-saving design fits alongside turbines and auxiliary equipment in confined dam powerhouse installations
Low noise operation — Low-loss core materials and vibration-damping design reduce operational noise, meeting environmental regulations for ecologically sensitive areas
Grid code compliance — Built-in voltage regulation and harmonic filtering ensure stable power quality and seamless grid integration per grid interconnection requirements
Long-term durability — Corrosion-resistant stainless steel hardware and sealed construction deliver 30+ year design life with minimal maintenance, including for coastal saline environments

Technical Parameters

Parameter	Value
Rated Power	840 MVA
High Voltage (HV)	500 kV
Low Voltage (LV)	13.8 kV / 20 kV
Rated Frequency	50 / 60 Hz
Number of Phases	3
Vector Group	YNd11
Short-circuit Impedance	16%
HV Insulation Level (LI / AC)	1550 kV peak / 680 kV
LV Insulation Level (LI / AC)	95 kV peak / 38 kV

Environmental Conditions

Ambient temperature: −25 °C to +40 °C (24h average ≤ +35 °C)
Altitude: ≤ 1000 m
Relative humidity: ≤ 90% (at +25 °C)
Solar radiation: ≤ 1000 W/m²
Pollution level: Light to heavy

FAQ for transformer

Q: What are the main classification dimensions of power transformers in international and domestic standards, and what are the specific types?

Power transformers are classified by insulation and cooling method, voltage function, and core structure. By insulation and cooling, they fall into liquid-insulated (oil-immersed) and dry-type — oil-immersed transformers dominate transmission applications up to 345 kV and above with standardized cooling like ONAN, ONAF and OFAF, while dry-type transformers are primarily used indoors at lower voltages up to 35 kV.

By voltage function, they are divided into step-up transformers (used in power plants to raise generator voltage to transmission levels), step-down transformers (used in substations to reduce transmission voltage for sub-transmission or distribution), and autotransformers (employed for fixed-ratio system interconnections, offering high efficiency in transmission grids). By core structure, they include core-type transformers (with windings surrounding core limbs, common in EHV applications) and shell-type transformers (with core surrounding the windings).

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Model

GSU-110/300MVA

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