Product Overview

BS photovoltaic box transformer (PV transformer for short) is a new type of prefabricated substation independently developed by us.
This substation adopts an oil-immersed structure and realizes natural ventilation through exposed heat sinks; at the same time, it is equipped with an intelligent protection system consisting of fuses, grounding switches, etc., which can fully guarantee the safe operation of the equipment. In terms of structural design, the equipment is highly compact, occupying only 58% of the area of European box transformers. In addition, it has the dual characteristics of protection and heat dissipation, which enables it to flexibly adapt to various application scenarios such as photovoltaic power stations and wind power projects.

Product Features

Excellent heat dissipation and protection performance

Our PV transformer box and heat sink are exposed outside the box, which can make full use of the natural environment for heat dissipation and have good heat dissipation performance. The remaining live compartments are all independent sealed compartments separated by partitions, which can effectively prevent dust, moisture, etc. from entering, improving the reliability and safety of the equipment.

Reasonable structural design

The photovoltaic box transformer consists of three parts: high-voltage room, low-voltage room and transformer, usually arranged in an "L" shape or triangle. This arrangement can effectively utilize space, make the box structure more compact, and facilitate transportation and on-site installation. It is also conducive to electrical connection and heat dissipation between the various parts.

Excellent box material

The transformer box is made of cold-rolled steel plate or stainless steel plate, with smooth inner and outer surfaces, free of rust, coating peeling, impact damage and other defects, which extends the service life of the box and enables it to adapt to various harsh natural environments outdoors.

Main Technical Parameters

Rated Capacity (kVA)	High Voltage (HV) / Low Voltage (LV)	630~8000
Voltage (kV)	Rated Voltage on High Voltage Side	35(36, 36.5, 37, 38.5)
	Maximum System Operating Voltage	40.5
	Rated Voltage on Low Voltage Side	For Wind Power Generation	0.69(0.95, 1.14)
		For Photovoltaic (PV) Power Generation	0.48, 0.5, 0.54, 0.6(0.63, 0.8)
Rated Insulation Level (kV)	Power Frequency Withstand Voltage on High Voltage Switch Side	95
	Power Frequency Withstand Voltage of Transformer Body	85
	Lightning Impulse Withstand Voltage (Peak)	200
	Power Frequency Withstand Voltage on Low Voltage Side of Transformer	5
Connection Group	For Wind Power Generation	Dyn11
	For Photovoltaic (PV) Power Generation	Dy11 or Yd11;Dyn11,Dy11y11 或 yd11d11
Protection Rating (IP Rating)	Oil Tank	IP68
	High Voltage and Low Voltage Chambers	IP54
	After Opening the High Voltage Chamber Door	IP3X
Rated Frequency (Hz)	50/60
Number of Phases	3-Phase

35kV Voltage Level

Component Name

Rated Voltage (kV)

Rated Current (A)

Power Frequency Withstand Voltage (Phase-to-Phase / Across Break) (kV)

Lightning Impulse Withstand Voltage (kV)

Short-time Withstand Current Duration (kA/s)

Peak Withstand Current (kA)

Mechanical Life (Operations)

Vacuum Load Switch (or Vacuum Circuit Breaker)

40.5

630, 1250

95 /115

185/215

20/4

25/4

31.5/4

10000

Current-limiting Fuse (Not applicable for circuit breakers)

40.5

16, 20, 25, 31.5, 40, 50, 63, 80, 100

185

Rated Maximum Breaking Current (kA): 31.5

10kV Voltage Level