Three Phase and Toroidal Coil Structure oil type transformer

Three Phase and Toroidal Coil Structure oil type transformer      

About us---- Elolam Group :

Elolam Group,initiated and established by Shandong Elolam Electric Power Technology Company,is the short of Elolam Electric Group.

Elolam Group is in the business of designing, producing and selling of high magnetic oriented silicon steel,fold iron steel ,roll iron steel,cable ,transformer ,and switch.Eloam aims to provide all-round comprehensive supporting services for the  large power companies.

Eloalm Group successively established transformer manufacturing enterprises and selling companies in the form of joint venture or cooperation in Africa,East, south and west of Asia countries and regions .

Eloam Group therefore become a real multinational group enterprise in the power transmission and transformation supporting industry.

The detailed information of variable transformer Winding:

1) The high-voltage (HV) coil adopts an interleaved-continuous structure to improve the voltage characteristics under impact voltage and make voltage evenly distributed. All stays and pads are chamfered to keep highly reliable insulation.

2) In the transformer winding there is a zigzag oil guide structure so as to fully cool all areas inside the winding, lower the temperature rise of the winding and the hot points of the winding and prolong the service life of insulation. The HV and MV regulation system are independently provided with voltage-regulating winding to balance the ampere turn of each winding, effectively lower the axial electrodynamic force generated at short-circuit of transformer and improve abrupt short-circuit withstanding capacity.

3) The winding adopts radial “0” margin designed, between the core and the paper sleeve of LV winding, and between the LV, HV, voltage-regulating windings, as well as before insertion of stays and shroud plate they are fully dried and tightly matched to ensure extremely good compactness and concentricity of the entire winding.

About the testing of three phase variable transformer :

• Measurement of winding resistance 

• Ratio test 

• Vector group 

• Separate source voltage withstand test 

• Induced over-voltage 

• Insulation resistance 

• Oil leakage test on fully assembled transformer for 12 hours 

• Measurement of impedance voltage 

• Magnetic balance 

• Measurement of no-load loss and curren 

• Measurement of load loss (at normal & extreme taps) 

• Tests on on-load tap-changer 

• Tests on on-load tap-changer remote control panel 

• Efficiency at 50%, 75%, 100% loading at unity p.f and rated terminal voltage (Corrected to 75C) 

• Lightning impulse withstand test

Notes for placing orders:

Transformer type: rated capacity kVA
Number of phases: three-phase or single-phase
High voltage: KV

Low voltage: KV
Frequency: 50HZ 60HZ
Tapping range:±4×2.5% ±3×2.5% other
Connection group: Yyn0 or Dyn11 or other
Impedance voltage: 4% or 6% or other

 Trade Terms: 

 1.Payment: 1) 30% in advance, balanced 70% to be paid before dispatch.       2) L/C

2.Port of loading: Qindao  Port, Tianjin Port , Ningbo Port and Shanghai Port 

3. Delivery time:10-30 days according to order quantities. 

Other related accessories for oil immersed power transformer :  

• transformer oil tank 

•                                    insulated  electromagnetic wire for transformer
•                                            finned radiator for transformer cooling

•                             iron silicon steel core

                                      Service for you!