Photovoltaic Auxiliary Energy Storage Transformer

Product Overview：

The grid-connected energy storage auxiliary isolation transformer for photovoltaic power generation is generally used for solar inversion, with common voltages including 800V to 400V, 380V, 690V to 400V, 540V to 400V, etc. (customizable as required); due to the low photoelectric efficiency of photovoltaic silicon panels, the transformer is specially required to have high efficiency. The photovoltaic isolation transformer is equipped with a microcomputer intelligent time controller to set daytime operation and nighttime stop for reducing no-load power loss, a temperature controller to real-timely monitor the operating temperature of the transformer, control the start and stop of the cooling fan, and automatically stop and disconnect the transformer when the operating temperature is too high to reach the set critical temperature for protecting the safety of the transformer body, a self-reset overvoltage and undervoltage protector to prevent islanding operation, a surge protector to effectively prevent lightning damage to equipment and improve the safety factor of the power generation system, and a knife switch on the grid-connected side to facilitate effective operation and maintenance of the equipment.

Key Features:

• Smart Controls: Microcomputer time controller reduces nighttime no-load losses.

• Safety Protections:

• Temperature monitor with auto-shutdown at critical thresholds.

• Over/under-voltage self-reset protector prevents islanding.

• Surge arrester for lightning protection.

• Grid-side knife switch for maintenance.

• Flexible Configurations: Available in single/multi-unit combinations (1:2, 1:3, etc.) for scalable PV systems.

Technical data：

Operating Conditions

• Ambient Temperature: -15℃~+50℃

• Relative Humidity: 20 to 90% RH

• Atmospheric Pressure: 860hPa~1060 hPa

• Storage/Transport Temperature: -20℃~+55℃

• Rated Capacity: 5-300kVA

• Input Voltage: 800V

• Input Current: As per actual capacity

• Output Voltage: 400V

• Output Current: As per actual capacity

• Connection: Dyn11 (△/Y), Yny0 (Y/Y)

• Efficiency: ≥96%

• Frequency: 50Hz/60Hz

• Insulation Impedance:≤500 MΩ under the test condition of 25 mA

• Inductive Withstand Voltage: 125Hz/800V/60s

• Insulation Class: Class H (155℃ temperature resistance)

• Noise Level: ≤30dB

• Temperature Rise: ≤115K allowable

• Impedance Voltage Drop: ≤4%

• Cooling Structure: Forced air cooling with temperature controller (fan starts automatically at set temperature per customer requirements)

• Protection Class: IP54

• Anti-Interference Method: Copper foil isolation, shielded grounding

• Waveform Distortion: No additional distortion

• Electrical Strength: 3000V AC power frequency sine voltage for 1min without breakdown/flashover

• Insulation Resistance (input/output to ground): Test voltage ≥1000VDC, insulation resistance >50MΩ;

• Overload Capacity: 2x rated current for 1min