Solar Photovoltaic System Solution

Daelim Transformer is a global leader in serving the renewable energy sector worldwide. With a proven track record, we have supplied thousands of transformers for photovoltaic and energy storage projects across North America, Europe, and Australia. Our products not only meet stringent standards such as IEEE, ANSI, CSA, AN, IEC, and BS,  but also hold certifications including UL, cUL, CSA, CE, SGS, and others, supported by comprehensive test reports.

Efficiency, reliability, and safety are the foundational principles we unwaveringly adhere to.

Below are solutions for some solar projects provided by Daelim for the United States, Canada, and other countries.

 

Solar project in Vancouver, Canada

solar project in 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
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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3 Phase Pad Mounted Transformer

 

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

750 kva pad mount transformer drawing
 

750 kVA Pad Mounted Transformer Nameplate

pad mounted transformer nameplate

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750 kVA Pad Mounted Transformer Secondary Wiring Diagram

transformer secondary wiring diagram

 Transformer Package

transformer package
Learn more about Daelim Pad Mounted Transformer

Solar power project in Maine, USA

solar-photovoltaic-soluton-in-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°

 

solar transformer requirements
 

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:

12.47 kv transformer
 

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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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

Read more detail about Daelim Solar Energy Transformer Solution

 

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