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Power Transformer Series

35kv Oil-immersed Power Transformer

The 35KV Three-phase Oil-immersed Power Transformer adopts a high-quality cold-rolled silicon steel sheet and ladder three-stage seam,.The surface is coated with curing paint, which effectively reduces loss and noise; the coil is wound with high-quality oxygen-free copper conductor, the novel oil duct structure with reasonable design is adopted for radiation, which optimizes the insulation process, improves mechanical strength and anti-short circuit ability. It has artistic and generous outline, and is widely used in the transformer substations (stations), and urban and rural power grids.

  • Model Description:

    Technical Parameters:

    1. Rated Capacity: see Table 1, Table 2 and Table 3:

    2. Rated Voltage: see Table 1, Table 2 and Table 3:

    3. Rated Frequency 50 Hz

    4. Number of Phases: 3 phases;

    5. Cooling Mode; oil-immersed natural cooling(ONAN);

    6. Temperature Resistance Level of the Insulation Materials: Level A;

    7. Technical Performance Data and Coupling Group Number: see Table 1, Table 2 and Table 3.

     

    Table 1 Double Windings No Excitation Voltage Adjustment Distribution Transformer

    Rated 

    Capacity (kVA)

    Voltage Combination (kV)

    Coupling Group

    No-load 

    Loss (W)

    Load Loss (W) (75℃)

    Short-circuit 

    Impedance (%)

    No-load 

    Current (%)

     

    High-voltage (KV)

    Tapping (%)

    Low-voltage (KV)

     

    50

    35             38.5

    ±5           
    ±2×2.5   

    0.4

    Dyn11         Yyn0         

    160

    1200/1140

    6.5

    1.6

    1.3

    100

    230

    2010/1910

    1.4

    1.1

    125

    270

    2370/2260

    1.4

    1.1

    160

    280

    2820/2680

    1.3

    1

    200

    340

    3320/3160

    1.2

    1

    250

    400

    3950/3760

    1.1

    0.95

    315

    480

    4750/4530

    1.1

    0.95

    400

    580

    5740/5470

    1

    0.85

    500

    680

    6910/6580

    1

    0.85

    630

    830

    7860

    0.9

    0.65

    800

    980

    9400

    0.8

    0.65

    1000

    1150

    11500

    0.8

    0.65

    1250

    1400

    13900

    0.7

    0.6

    1600

    1690

    16600

    0.6

    0.6

     

    Note: for the transformer with the rated capacity of 500KV and below, the load loss above the slash in the table is only applicable for Dyn11 connection group, and the load loss value below the slash is applicable for Yyn0 connection group.

      

    Table 2 Double Windings No Excitation Voltage Adjustment Distribution Transformer

    Rated 

    Capacity (kVA)

    Voltage Combination (kV)

    Coupling Group

    Idle Load 

    Loss (W)

    Load Loss (W) (75℃)

    Short-circuit Impedance (%)

    No-load 

    Current (%)

     

    High-voltage (KV)

    Tapping (%)

    Low-voltage (KV)

     

    800

    35

    ±2×2.5   
    ±5

    3.15           6.3           10.5

    Yd11

    980

    9400

    6.5

    0.8

    0.65

    1000

    1150

    11500

    0.8

    0.65

    1250

    1400

    13900

    0.72

    0.55

    1600

    1690

    16600

    0.64

    0.45

    2000

    2170

    18300

    0.56

    0.45

    2500

    2500

    19600

    0.48

    0.45

    3150

    35~38.5

    3040

    23000

    7

    0.45

    0.45

    4000

    3610

    27300

    0.45

    0.45

    5000

    4320

    31300

    0.38

    0.45

    6300

    5240

    35000

    7.5

    0.38

    0.45

    8000

    ±2×2.5

    3.5      
    3.3       
    6.3           6.6   
    10.5

    YNd11

    7200

    38400

    0.34

    0.35

    10000

    8700

    45300

    0.34

    0.35

    12500

    10000

    53800

    8

    0.32

    0.3

    16000

    12100

    65800

    0.32

    0.3

    20000

    14400

    79500

    0.32

    0.3

    Note: for the transformer with low voltage of 10.5KV, the product with coupling group grade of Dyn11 can be provided.


    Table 3 Double Windings on-load-tap-changing Transformer

    Rated 

    Capacity (kVA)

    Voltage Combination (kV)

    Coupling Group

    Idle Load 

    Loss (W)

    Load Loss (W) (75℃)

    Short-circuit 

    Impedance (%)

    No-load 

    Current (%)

     

    High-voltage (KV)

    Tapping (%)

    Low-voltage (KV)

     

    2000

    35

    ±3×2.5

    6.3            10.5

    Yd11

    2300

    19200

    6.5

    0.64

    0.5

    2500

    2720

    20600

    0.64

    0.5

    3150

    35~38.5

    3230

    24700

    7

    0.58

    0.5

    4000

    3870

    29100

    0.58

    0.5

    5000

    4640

    34200

    0.54

    0.5

    6300

    5630

    36700

    8

    0.54

    0.5

    8000

    6.3     
    6.6    
    10.5

    YNd11

    7870

    40600

    0.48

    0.4

    10000

    9280

    48000

    0.48

    0.4

    12500

    10900

    56800

    0.45

    0.35

    16000

    13100

    70300

    0.43

    0.35

    20000

    15500

    82700

    0.43

    0.35

    25000

    18300

    97800

    10

    0.4

    0.3

    Note: for the transformer with low voltage of 10.5KV, the product with coupling group grade of Dyn11 can be provided.

  • The 35kV Oil-immersed Power Transformer product manufactured by our company has the features of 'four lows and one high', which are: low loss, low noise, low temperature rise, low partial discharge, and high reliability. Meanwhile, it has the features of lifting core-free, no leakage and more. The advanced design software is adopted for electromagnetic calculation, and computational analysis of main and longitudinal insulation, impulse voltage gradient distribution, end electric field distribution, short-circuit thermal stability, dynamic stable intensity, etc, so as to guarantee the design margin as well as the safe and reliable operation of the transformer. Our company has successfully manufactured multiple 35kV large-capacity 25000kVA power transformers, the market share of the product is high, and user satisfaction is good.

    1. Low Loss and Low Noise:

    The high-performance cold-rolled oriented silicon steel sheet is adopted for the iron core. The fully automatic cross cutting machine is employed, the small shearing burr and the low lamination coefficient can effectively reduce no-load loss, no-load current and the noise of the transformer.

    2. Safe and Reliable Operation:

    The sufficient margin is reserved for transformer insulation design, and the partial discharge amount is ≤ 100pC. The winding current density is reasonable, the conductor withstand stress has an appropriate margin, and the temperature rising of the transformer oil level is lower than national standards.

    3. Advanced Structure and Convenient Maintenance:

    a. The high-quality insulation framework is adopted in the coil for support. Both the internal and external stays are adopted for all coils, chamfer is adopted for all stays and cushion blocks, the electric field is uniform, and reliability is enhanced. The self-locking nuts are selected for all fasteners on the body, so that the product can withstand bumps during long-distance transport, be free of loosening and not requiring lifting core;

    b. The wide-width steel plate is adopted for the oil tank wall to reduce seam, the unique welding process is adopted, and there is no leakage, so as to guarantee welding quality;

    c. The trench structure is adopted for sealing flanges, so as to guarantee sealing performance. The copper valve is adopted for all oil drain valves, and the vacuum butterfly valve is adopted for the radiator, so as to reduce probability of leakage;

    d. The transformer is installed with the oil surface thermometer. The pressure release valve with contact is installed at the top of the oil tank. The oil level gauge with contact is adopted for the oil level sign of the oil conservator. The anti-fouling enhanced pure porcelain oil bushing is adopted for the high and low voltage bushings, which can be used for the environment at heavy pollution level.


  • Table 1 Double Windings No Excitation Voltage Adjustment Distribution Transformer

    Rated Capacity (kVA)

    External Dimensions (mm) L × W × H

    Weight (kg)

    Gauge (mm)

    Machine 

    Weight

    Oil Weight

    Total Weight

    50

    1150×720×1200

    230

    320

    680

    550×550

    100

    1200×740×1300

    380

    400

    980

    550×550

    125

    1250×780×1380

    440

    430

    1100

    550×550

    160

    1300×800×1400

    510

    460

    1200

    660×660

    200

    1400×840×1500

    620

    500

    1400

    660×660

    250

    1530×860×1580

    690

    530

    1500

    660×660

    315

    1600×890×1630

    820

    570

    1680

    660×660

    400

    1730×950×1700

    930

    650

    1950

    660×660

    500

    1800×980×1800

    1070

    710

    2300

    820×820

    630

    1900×1000×1850

    1320

    830

    2650

    820×820

    800

    1950×1060×1900

    1570

    900

    3100

    820×820

    1000

    1980×1100×1950

    1800

    1080

    3750

    820×820

    1250

    2010×1160×1980

    2100

    1150

    4050

    820×820

    1600

    2040×1310×2000

    2550

    1250

    4730

    820×820

    Table 2 Double Windings No Excitation Voltage Transformer

    Rated 

    Capacity (kVA)

    External Dimensions (mm) L × W × H

    Weight (kg)

    Gauge (mm)

    Machine 

    Weight

    Oil Weight

    Total Weight

    800

    2020×1360×2400

    1510

    890

    3250

    820×820

    1000

    2180×1380×2550

    2060

    1040

    3780

    1070×1070

    1250

    2220×1300×2520

    2150

    1090

    3890

    1070×1070

    1600

    2270×1340×2450

    2430

    1140

    4450

    1070×1070

    2000

    2250×1380×2210

    2820

    1420

    5670

    1070×1070

    2500

    2300×1400×2300

    3330

    1550

    6100

    1070×1070

    3150

    2520×2720×2550

    3670

    1630

    7100

    1070×1070

    4000

    2800×2250×2500

    4500

    1830

    8250

    1070×1070

    5000

    3000×2370×2800

    5255

    1900

    9120

    1070×1070

    6300

    2830×3020×2920

    6650

    2250

    11200

    1070×1070

    8000

    3300×2970×3050

    9470

    3160

    15200

    1475×1475

    10000

    3250×2850×3000

    10180

    3050

    17000

    1475×1475

    12500

    3500×2930×3500

    11000

    3660

    18800

    1475×1475

    16000

    3620×3040×3600

    13650

    4250

    22200

    1475×1475

    20000

    3900×3650×3540

    15200

    5250

    26750

    1475×1475

    Table 3 Double Windings on-load tap Changing Transformer

    Rated 

    Capacity (kVA)

    External Dimensions (mm) L × W × H

    Weight (kg)

    Gauge (mm)

    Machine 

    Weight

    Oil Weight

    Total Weight

    2000

    2600×1800×2785

    3100

    1800

    6100

    1475×1475

    2500

    2700×1900×2970

    3570

    1850

    7000

    1475×1475

    3150

    3390×2170×3040

    4805

    2575

    8850

    1475×1475

    4000

    3100×3000×3150

    4470

    2320

    9250

    1475×1475

    5000

    3100×3000×3450

    5550

    2550

    10800

    1475×1475

    6300

    3320×3350×2980

    6450

    2860

    12300

    1475×1475

    8000

    3470×3130×3550

    7970

    3150

    14720

    1475×1475

    10000

    4596×3670×3735

    10250

    5275

    20655

    1475×1070

    12500

    4945×3550×3720

    13385

    5985

    24185

    1475×1475

    16000

    4940×3550×4457

    14690

    7025

    27835

    1475×1475

    20000

    4950×3945×4025

    17250

    7565

    31325

    1475×1475

    25000

    5100×3640×4220

    20995

    8530

    36510

    1475×1475

    Note: the external dimensions shall be subject to actual dimensions of the transformer.

  • 1. Iron Core: 30Q130 high permeability silicon steel sheet is used. The advanced step multi-laminated mode is adopted to effectively reduce no-load loss, no-load current and noise;

    2. Winding: the oxygen-free copper conductor with high electric conductivity is adopted as the electromagnetic wire, and the new process of overall package of the cylinder type, double pie type and novel screw type is adopted for winding, so that the product structure is more compact. Main insulation can be effectively guaranteed, the first and tail layers are reinforced, and insulation property is improved. The outer surface of winding is wound with high-strength shrinkable tape, which improves its mechanical strength, and greatly improves its impact resistance and anti-short circuit ability;

    3. Body: the body insulation pad is supported with the high-strength laminated wood and laminated paper board, so that the supporting area at the winding end reached over 95%, so as to further improve product anti-short circuit ability and operation reliability. The stiff belt buffer structure is adopted for connection between the body and the box cover, so as to overcome the phenomena of 'suspension' and 'the cover pressing'. The insulation material is wrapped with the high-strength and high-density cable paper, and the allowed pressure is 45MPa;

    4. Oil Tank: the radiating pipe is adopted for the oil tank (the piece inserting method is adopted for the double-row and three-row oil pipes), or the ladder finned radiator is adopted, so as to increase the heat-dissipating capability in the same tank wall area; the finned radiator or corrugated tank and the forced oil air cooling or forced oil water cooling heat sink shall also be installed according to users' requirements. 'Conformal coating' (salt fog proof, high temperature-resistant, and mould proof) is used for the surface treatment of the oil tank, the adhesion force of the top coat and the primer is strong, decoration is good, the thin film oil resistance, corrosion resistance, gloss retention and color retention are good, and it has good leveling property and covering power;

    5. Chosen Components: the pressure relief valve, signal thermometer, gas relay and more are installed according to the standard requirements, so as to guarantee a safe operation of the transformer;

    6. The series products have an artistic appearance and small sizes, which can reduce the floor area for installation, and are the ideal maintenance-free high-quality ones.

    Meanwhile, we make many improvements based on traditional structure and mature technology, such as: helical winding with longitudinal oil duct, better internal radiation; improved effective support of the coil end surface, and stronger resistance to short-circuit current; the new lifting structure and body positioning structure are adopted to make it more reliable for long-distance transport and operation.

  • 1. Maximum temperature: +40℃/+104ºF;

    2. Maximum daily average temperature: +30℃/+84ºF;

    3. Maximum annual average temperature: +20℃/+68ºF;

    4. Minimum temperature: -45℃/-49ºF;

    5. Elevation shall not exceed 1000m;

    6. Indoor or outdoor use.

    Note: please make specific instructions in case of any special use conditions.


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Your local Huaxin Cooperation Team

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