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Solar Transformer

The solar transformer is specifically designed for photovoltaic power generation systems and serves as the core equipment of photovoltaic substations, stepping up the low-voltage power output from PV inverters to medium or high voltage for grid connection. With an oil-immersed structure, it features low loss, high reliability, and adaptability to wide voltage fluctuations. It is widely used in ground-mounted PV power plants, industrial and commercial rooftop PV systems, agrivoltaic projects, and fishery-solar hybrid projects.


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Technical Parameters

Electrical Performance Parameters

Parameter	Specification
Rated Power	100kVA ~ 10000kVA
Rated Voltage	High Voltage Side: 10kV / 20kV / 35kV / 66kV
Rated Voltage	Low Voltage Side: 0.4kV / 0.48kV / 0.6kV / 0.69kV / 0.8kV / 1.14kV
Frequency	50Hz / 60Hz
Phase	Three-Phase
Connection Group	Dyn11 / Yd11 / Yyn0
Cooling Method	ONAN / ONAF
Insulation Medium	Mineral Oil / Natural Ester Oil
Impedance Voltage	4% ~ 8%（Depending on Capacity）
No-Load Tap Changer	±2 × 2.5%（High Voltage Side）
On-Load Tap Changer	Optional
Temperature Rise Limit	Top Oil: ≤ 65K
Protection Class	IP54 / IP65

Solar Transformer Complete Parameter Table

No.	Capacity (kVA)	HV Side (kV)	LV Side (kV)	No-Load Loss (W)	Load Loss (W)	Impedance (%)
1	100	10	0.4	290	1500	4
2	200	10	0.4	480	2500	4
3	315	10	0.4	670	3600	4
4	400	10	0.4	800	4300	4
5	500	10	0.4	960	5100	4
6	630	10	0.48	1150	6200	4.5
7	800	10	0.48	1400	7500	4.5
8	1000	10	0.48	1650	8800	4.5
9	1250	10	0.48	1950	10500	4.5
10	1600	10	0.69	2350	12800	5
11	2000	10	0.69	2800	15600	5
12	2500	20	0.69	3300	18500	5.5
13	3150	20	0.69	3950	22000	5.5
14	4000	35	0.8	4800	26000	6
15	5000	35	0.8	5800	31000	6
16	6300	35	1.14	7000	38000	6.5
17	8000	35	1.14	8500	47000	7
18	10000	35	1.14	10200	57000	7

Note 1: Load loss values are based on reference temperature of 75℃.

Note 2: Other capacities and voltage ratings can be customized according to customer requirements.

Outline Dimension Reference Table

Capacity (kVA)	L / Length (mm)	W / Width (mm)	H / Height (mm)	Weight (kg)
100	1200	850	1000	520
200	1350	950	1150	780
315	1450	1050	1250	1020
400	1500	1100	1300	1180
500	1550	1150	1350	1360
630	1650	1200	1450	1620
800	1750	1300	1550	1980
1000	1850	1350	1650	2380
1250	1950	1400	1750	2820
1600	2050	1450	1850	3350
2000	2150	1500	1950	3980
2500	2250	1550	2050	4700
3150	2400	1650	2200	5600
4000	2600	1800	2400	6800
5000	2800	1950	2600	8200
6300	3100	2150	2850	10000
8000	3400	2350	3150	12500
10000	3800	2600	3500	15500

Note: The dimensions above are for reference only. Specific dimensions can be customized according to customer requirements.

Applications

Application	Recommended Capacity	Recommended Voltage Level
Commercial Rooftop PV	100-1000kVA	10kV
Ground-Mounted PV Power Plant	1000-5000kVA	10kV / 20kV / 35kV
Agrivoltaic Projects	500-3150kVA	10kV / 20kV
Fishery-Solar Hybrid Projects	1000-5000kVA	10kV / 35kV
Mountain PV Projects	500-2500kVA	10kV / 20kV
PV + Energy Storage Systems	1000-6300kVA	10kV / 35kV

Selection Guide

Capacity Selection

Determine transformer capacity based on PV plant installed capacity and inverter configuration:

PV Installed Capacity (MWp)	Recommended Transformer Capacity (kVA)
≤ 0.1	100
0.1-0.2	200
0.2-0.3	315
0.3-0.4	400
0.4-0.5	500
0.5-0.6	630
0.6-0.8	800
0.8-1.0	1000
1.0-1.2	1250
1.2-1.5	1600
1.5-1.8	2000
1.8-2.2	2500
2.2-2.8	3150
2.8-3.5	4000
3.5-4.5	5000
4.5-5.5	6300
5.5-7.0	8000
7.0-9.0	10000

Voltage Level Selection

HV Side Voltage	Applicable Scenario
10kV	Small to Medium PV Plants, Commercial Rooftop
20kV	Medium PV Plants, Industrial Parks
35kV	Large PV Plants, Centralized Grid Connection
66kV	Ultra-Large PV Plants, High Voltage Grid Connection

Low Voltage Side Selection

LV Side Voltage	Applicable Scenario
0.4kV / 0.48kV	Small Inverters, Commercial Rooftop
0.6kV / 0.69kV	Mainstream Inverter Output Voltage
0.8kV / 1.14kV	High-Power Inverters, Large PV Plants

Customization Services

Sline provides comprehensive customization services for solar transformers based on your project requirements:

Customization Option	Description
Capacity Customization	100kVA ~ 10000kVA / Full range coverage
Voltage Customization	HV: 10kV-66kV, LV: 0.4kV-1.14kV and non-standard voltages
Connection Group	Dyn11 / Yd11 / Yyn0 / Optional
Insulation Medium	Mineral Oil / Natural Ester Oil
On-Load Tap Changer	Optional
Special Environment	High altitude, coastal salt fog, etc.

For detailed technical drawings or customized solutions, please contact the Sline technical team. We will provide one-on-one engineer-led service throughout the process.