Solar Photovoltaic System Solution
DB Transformer serves the world's renewable energy field. Below are solutions for some solar projects provided by Daelim for the United States, Canada, and other countries.
Solar project in Vancouver, Canada
This project is located in Vancouver. The inverter model for the solar system is SG250HX. Customers should match the most suitable transformer for it. This solar power plant is not very large. Daelim provides them with two sets 24940GRDY/14400 750kva Pad Mounted Transformers.
Let's introduce this project in detail below:
The technical requirements of the transformer which is connected with the SG250HX inverters.
Technical Properties of SG250HX
SG250HX Transformer Requirements
1) The transformer must be suitable for operating with a pulsed inverter.
2) In case anti-PID solution (potential induced degradation) is used, transformer secondary windings shall be able to handle Vrms=906V VAC peak voltage reference to the ground for the 1500V system. The LV side of the transformer and the maximum continuous voltage of lightning protection devices for the LV side of the transformer should comply with this requirement.
3) The output voltage of SG250HX is 800Vac L-L (640~920Vac), 50Hz or 60Hz. The voltage at the MV side shall be in line with the MV grid voltage at the connection point, transformer with tap changer is preferred.
4) Transformer capacity shall be in line with the Inverters max. output power
5) Double split (two for LV, one for MV side) transformer is to be used, two LV windings are needed.
Dy11y11 connections can be used. A double winding (one for LV, one for MV side) transformer is to be used, one LV winding is needed, and Dy11 connections can be used.
6) Impedance voltage Z(%) shall comply with related standard requirements. Such as IEC 60076 or IEEE C57.12.34 and C57.12.00.
7) The transformer shall be capable of withstanding a certain level of harmonic current, the max. total harmonic current is 5% of fundamental current at nominal power.
8) The transformer shall withstand a certain level of DC component, 0.5% of fundamental current at nominal power.
9) The transformer shall withstand a specific phase imbalance, 5% of the current at nominal power.
10) The LV winding of the MV transformer shall withstand a voltage gradient dU/dt of up to 500V/μs to ground.
11) Good shield and isolation between LV and MV windings.
12) The transformer shall be grounded at only one point, and the grounding of the transformer must be secure.
13) The insulation class shall be at least F for dry-type transformers and A for oil type.
| Insulation class | A | E | B | F | H | N | C |
| Max. temp. (℃) | 105 | 120 | 130 | 155 | 180 | 200 | 220 |
| Temp. raise of winding (K) | 60 | 75 | 80 | 100 | 125 | 135 | 150 |
14) The load Weighed efficiency shall comply with the latest local requirements.
15) The local environment (temperature, humidity, altitude, air, etc.) shall be considered.
16) The temperature rise and min. electric clearance shall be considered especially when the altitude is over 1000m.
17) The country-specific grid frequency & standards shall be respected.
According to the customer's requirements for the transformer, the Daelim team quickly provided the solar power plant with a suitable technical solution. The two 750kva Radial Feed Three Pad Mounted Transformers.
The project is located in Canada, so According to the customer's requirements for the transformer, the Daelim team quickly provided the project with a suitable technical solution. The two 750kva Radial Feed Three Pad Mounted Transformers. These two transformers are five-legged core assembly, and the vector group is YNyn0.
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The solar project is located in Canada, so the solar transformers shall be built to standard CSA C88-16, IEEE C57.12.00, IEEE C57.12.34, and CSA C227.4
750 kVA Pad mounted Transformer Outline Drawing
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Solar power project in Maine, USA
This solar plant project is located in New Sharon, Maine. The capacity of this solar power plant is still relatively large. Daelim provides a total of 33 sets of Solar Transformers for this project. The customer is a local Utility company in the United States.
Reading more about Solar Transformer
Below are the requirements of some Solar Transformer sent by the customer:
Solar power plant system summary
| DC system size | 4885.92 KW |
| AC system size | 3600 KW |
| Module type | VSUN-540-144BMH-DC |
| Module qty | 9048 |
| Inverter | CPS 125KTL-D0/US-600 |
| Inverter derate | INVERTERS 1-28 @ 125KW(100%) |
| INVERTERS 29 @ 100KW(100%) | |
| Inverter qty | 29 |
| Azimuth/Tilt | ±60°/90°/270° |
•DC power converted to 600 Volts AC power (3 phase).
• 600 Volts AC stepped up on the skid to 12.47 kV AC.
Daelim Transformer Solutions
According to the technical requirements of the solar project, Daelim gives the transformer solution as follows:
| Three Phase Pad Mounted Transformer | ||||||||||
| Description | QTY | |||||||||
| 2750 KVA 600/347V Wye-Grd - 34.5kV Grd Wy, Bay-O-Net with PRCLF Fusing, RAPO oil, AL Windings, Non-Std Loop>> 600A A-Bushings / 200A B-Bushing for MCOV 24.4 arrestor, 3-Under oil Load Break switches, Padmounted transformer 24.4Kv B Bushing arrestors | 2 | |||||||||
| 2750 KVA 600/347V Wye-Grd - 34.5kV Grd Wy, Bay-O-Net with PRCLF Fusing, RAPO oil, AL Windings, Non-Std Loop>> 600A A-Bushings / 200A B-Bushing for MCOV 24.4 arrestor, 3-Under oil Load Break switches, Pad mounted transformer 24.4Kv B Bushing arrestors | 2 | |||||||||
| 2000KVA/2200KVA 13.2/7.62 GrdYPri, 600/347 GrdY, Static Shield, Bay-O-Net & PRCLF Fusing, Non-Std Loop , 600A A-Bushings & 200A B-Bushings, 10.2 MCOV Arrestor Elbows, RAPO oil, Loop Feed, Bi-Directional DOE2016, L/B Switch, Taps, DOE efficiency | 1 | |||||||||
| 2000KVA/2200KVA 13.2/7.62 GrdYPri, 600/347 GrdY, Static Shield, Bay-O-Net & PRCLF Fusing, 600A A-Bushings & B-Bushings, RAPO oil, Loop Feed, Bi-Directional DOE2016, L/B Switch, Taps, DOE efficiency | 1 | |||||||||
| XFMR A: 2500/2800 kVA 34.5/19.9 GrdY Pri - 600/347 GrdY Sec, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, Loop Design 600A A-Bushings & 600A B-Bushings with, Tap Changer, L/B Switch | 1 | |||||||||
| XFMR B: 2500/2800 kVA 34.5/19.9 GrdY Pri - 600/347 GrdY Sec, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, NonStdLoop 600A A-Bushings & 200A B-Bushings with 24.4MCOV Elbow Arrestors, Tap Changer, L/B Switch | 1 | |||||||||
| XFMR A: 2500/2800 kVA 34.5/19.9 GrdY Pri - 600/347 GrdY Sec, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, Loop Design 600A A-Bushings & 600A B-Bushings Feed-Thru, Tap Changer, L/B Switch | 1 | |||||||||
| XFMR B: 2500/2800 kVA 34.5/19.9 GrdY Pri - 600/347 GrdY Sec, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, NonStdLoop 600A A-Bushings & 200A B-Bushings with 24.4MCOV Elbow Arrestors, Tap Changer, L/B Switch | 1 | |||||||||
| XFMR A: 2500 kVA, 13.2 kV Delta primary, 600/347VGrdY Sec, Static Shield, RAPO, Bay-O-Net & PRCLF Fusing, LoopFeed, 600A A-Bushings & B-Bushings, Tap Changer, L/B Switch, Bi-Directional DOE2016 | 1 | |||||||||
| XFMR B: 1500 kVA, 13.2 kV Delta primary, 600/347VGrdY Sec, Static Shield, RAPO, Bay-O-Net & PRCLF Fusing, Non-Standard Loop, 600A A-Bushings and 200A B-Bushings with 8.4 MCOV Elbow Arrestors, Tap Changer, L/B Switch, Bi-Directional DOE2016 | 1 | |||||||||
| Xfmr A: 4000kVA Pad-, PRI:4.16KvDelta, SEC:34.5/19.9KV GrdY, Bi-Directional Step Down, Bay-O-Net & PRCLF Fusing, RAPO, NonStdLoop 600A A-Bushings & 200A B-Bushings with 24.4MCOV Elbow Arrestors, Tap Changer, L/B Switch, on 4.16V Side set-up for cable termination stress cones. Please see SLD E-300 | 2 | |||||||||
| Solar Xfmr A -2500/2800 kVA 34.5/19.9 GrdY Pri - 600/347 GrdY Sec, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, Loop Feed 600A A-Bushings & B-Bushings, Tap Changer, L/B Switch, SEE SLD E-301 | 2 | |||||||||
| BESS XFMR A - 1500 kVA 34.5/19.9 GrdY Pri - 600/347 GrdY Sec, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, NonStdLoop 600A A-Bushings & 200A B-Bushings with 24.4MCOV Elbow Arrestors, Tap Changer, L/B Switch, Bi-Directional DOE2016, SEE SLD E-303 | 2 | |||||||||
| XFMR A: 2500kVA 12.47/7.2Kv GrdY Pri, 600/347 GrdY, Static Shield, Bay-O-Net & PRCLF Fusing, 600A A-Bushings & B-Bushings, RAPO oil, Loop Feed, Bi-Directional DOE2016, L/B Switch, Taps, SEE SLD Sheet E-300 | 1 | |||||||||
| XFMR B: 2500kVA 12.47/7.2Kv GrdY Pri, 600/347 GrdY, Static Shield, Bay-O-Net & PRCLF Fusing, Non-Std Loop , 600A A-Bushings & 200A B-Bushings, 8.4 MCOV Arrestor Elbows, RAPO oil, Loop Feed, Bi-Directional DOE2016, L/B Switch, Taps, SEE SLD Sheet E-301 | 1 | |||||||||
| 3000 kVA 600 DELTA - 34.5kV Grd Wy, Bay-O-Net with PRCLF Fusing, RAPO oil, AL Windings, Static Shield, Non-Std Loop>> 600A A-Bushings / 200A B-Bushing for MCOV 24.4 arrestor, Under oil Load Break switches, Pad-mounted transformer 24.4Kv B Bushing arrestors | 1 | |||||||||
| 3600 kVA 600/347GrdY - 12.47/7.2Kv GrdY, Bay-O-Net with PRCLF Fusing, RAPO oil, AL Windings, Static Shield, Non-Std Loop>> 600A A-Bushings / 200A B-Bushing for MCOV 8.4 arrestor, Under oil Load Break switches, Padmounted transformer | 1 | |||||||||
| 2500kVA Pri:34.5KVGrdY Sec:600/347VGrdY, Loop Feed, 600A A&B Bushings, Static Shield, Alum Windings, RAPO, Bay-O-Net & PRCLF Fusing, Taps, LBOR Switch, Z=5.75% X/R=7.5, Bi-Directional DOE2016 | 1 | |||||||||
| 2500kVA Pri:34.5KVGrdY Sec:600/347VGrdY, Non-Standard Loop Feed, 600A Abushings & 200A B Bushings, 24.4 MCOV Arrestor Elbows on B-Bushings, Static Shield, Alum Windings, RAPO, Bay-O-Net & PRCLF Fusing, Taps, LBOR Switch, Z=5.75% X/R=7.5, Reverse Feed DOE 2016 | 1 | |||||||||
| XFMR A: 2500kVA Pri:34.5KVGrdY Sec:600V Wye, Loop Feed, 600A A&B Bushings, Static Shield, Alum Windings, RAPO, Bay-O-Net & PRCLF Fusing, Taps, LBOR Switch, Z=5.75% X/R=7.5, Bi-Directional DOE2016 | 1 | |||||||||
| XFMR B: 2500kVA Pri:34.5KVGrdY Sec:600v Wye, Non-Standard Loop Feed, 600A Abushings & 200A B Bushings, 29 MCOV Arrestor Elbows on B-Bushings, Static Shield, Alum Windings, RAPO, Bay-O-Net & PRCLF Fusing, Taps, LBOR Switch, Z=5.75% X/R=7.5, Bi-Directional DOE2016 | 1 | |||||||||
| XFMR B: 2500/2800 kVA 13.2/7.6Kv GrdY Pri - 600/347 GrdY Sec, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, NonStdLoop 600A A-Bushings & 200A B-Bushings with 10.2Kv MCOV Elbow Arrestors, Tap Changer, L/B Switch | 1 | |||||||||
| XFMR A: 2500/2800 kVA 13.2/7.6Kv GrdY Pri - 600/347 GrdY Sec, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, Loop Design 600A A-Bushings & 600A B-Bushings, Tap Changer, L/B Switch | 1 | |||||||||
| XFMR B: 2000 kVA 13.2/7.6Kv GrdY Pri - 600/347 GrdY Sec, Alum Windings, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, NonStdLoop 600A A-Bushings & 200A B-Bushings with 8.4Kv MCOV Elbow Arrestors, Tap Changer, L/B Switch, Bi-Directional DOE2016 | 1 | |||||||||
| XFMR A: 2000 kVA 13.2/7.6Kv GrdY Pri - 600/347 GrdY Sec, Alum Windings, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, Loop Design 600A A-Bushings & 600A B-Bushings, Tap Changer, L/B Switch, Bi-Directional DOE2016 | 1 | |||||||||
| XFMR A: 2500 kVA 13.2/7.6Kv GrdY Pri - 600/347 GrdY Sec, Alum Windings, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, NonStdLoop 600A A-Bushings & 200A B-Bushings with 8.4Kv MCOV Elbow Arrestors, Tap Changer, L/B Switch, Bi-Directional DOE2016 | 1 | |||||||||
| BESS XFMR 2: 2500 kVA 13.4 Delta Pri - 480/277v GrdY Sec, Alum Windings, Static Shield, Bay-O-Net & PRCLF Fusing, RAPO, NonStdLoop 200A A-Bushings & 200A B-Bushings DUAL INSERT with 10.2Kv MCOV Elbow Arrestors, Tap Changer, L/B Switch, Bi-Directional DOE2016 | 2 | |||||||||
Read more detail about Daelim Solar Energy Transformer Solution
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