PRODUCTSolar Transformers Solar Transformer /Solar Step Up Transformer/Energy Storage Transformer

Solar Transformer /Solar Step Up Transformer/Energy Storage Transformer

Rated voltage	LV Side: 0.4kV/0.69kV/1.14kV HV Side: 10kV/11kV/33kV
Rated capacity	315kVA - 6.3MVA

Product Introduction

Solar transformers, particularly step-up transformers, play a key role in grid-connected photovoltaic power generation systems. They are primarily used to boost the low-voltage AC power (0.4kV) output of the inverter to medium- and high-voltage (such as 11kV, 33kV, 110kV, and 220kV) levels, matching the grid voltage. This high-voltage connection enables long-distance transmission of electricity. Selecting the right transformer can significantly improve the overall performance and reliability of a photovoltaic system.

Transformers also play a crucial role in energy storage power plants. Within energy storage power plants, energy storage transformers perform two primary functions: voltage conversion and adaptation; and optimizing power transmission and ensuring grid stability.

Features

Highly Efficient and Energy-Saving Design
The use of high-permeability silicon steel laminations and a stepped lamination process effectively reduces both no-load and load losses. The optimized electromagnetic design improves operating efficiency and reduces operating costs.
Reliable and Durable Structure
The enhanced short-circuit resistance design, coupled with a comprehensive temperature control and protection system, ensures the transformer maintains reliable and stable performance under different operating conditions. The product has a design life of over 25 years and has passed relevant durability tests.

Technical Specification

Parameter Table
Capacity Range	315kVA – 6.3MVA
Voltage Matching	– LV Side: 0.4kV/0.69kV/1.14kV – HV Side: 10kV/11kV/33kV
Wide Voltage Range	±5% (Off-Circuit Tap) or ±10% (On-Load Tap Changer, OLTC)
High-Temp Protection	– Insulation: Class H (180°C) – Temp Rise Limit: ≤60K (@55°C ambient)
Moisture/Dust Proof	– IP Rating: IP65 (overall) – Special: Salt spray coating (coastal projects)
Optimized Impedance	8-10% (Enhanced short-circuit withstand)
Cost-Effective Design	– Core: Step-laminated Si-steel (No-load loss↓25%) – Option: Aluminum windings (Cost↓30%)
Safety & Fireproof	– Insulating Oil: K-class mineral (self-extinguishing) – Structure: Explosion-proof tank
Harsh Environment	– Altitude: ≤5000m – Sand: C5-M corrosion protection

Classification

Environment	Recommendation	Critical Considerations
Indoor	Dry-type transformers (Oil-free, fireproof)	– SCB10 or higher grade – Cooling efficiency & noise ≤65dB(A) – Safe maintenance clearance
Outdoor	Oil-immersed transformers; Compact substations (Integrated transformer + switchgear)	– IP54 minimum (IP65 for coastal/industrial areas) – Anti-corrosion coating – -40°C~50°C operation

Environment

Recommendation

Critical Considerations

Indoor

Dry-type transformers (Oil-free, fireproof)

– SCB10 or higher grade
– Cooling efficiency & noise ≤65dB(A)
– Safe maintenance clearance

Outdoor

Oil-immersed transformers;

Compact substations (Integrated transformer + switchgear)

– IP54 minimum (IP65 for coastal/industrial areas)
– Anti-corrosion coating
– -40°C~50°C operation