Cast resin transformers

Cast resin transformers represent an alternative solution for electric power distribution in medium voltage applications.

The advantages of cast resin transformers in comparison with the traditional oil-filled transformers are quite evident:

Minimal fire risk
The materials used for production of cast resin transformers are hardly inflammable and can be defined as self-extinguishing, which is why there is no need to use any special fire protection coatings for this type of transformers. Furthermore, in case of fire, the emission of toxic gases and opaque fumes is very low. These advantages make cast resin transformers a perfect choice for installations at places where safety is crucial, such as hospitals, public premises, airports, subway lines, mines, oil rigs, nuclear power plants, ships, etc.
No cooling liquids
Cast resin transformers need only air for cooling. They are therefore nearly maintenance-free, whereas a liquid-cooled transformer needs much more attention. This also makes cast resin transformers eco-friendlier since no liquid coolants – of whichever chemical composition – can be released into the environment.
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Easier maintenance
Cast resin insulation guarantees secure performance of the transformer with no need for complicated and costly maintenance. Preventive maintenance of cast resin transformers consists in a simple visual check.
Low operating costs
Low losses in the magnetic core and in the windings reduce the costs of operation.
Simplicity of installation
The transformer is a key component in the electrical supply network, therefore ease and quickness of its installation should be born in mind. A cast resin transformer is easily installed, e.g. no blast walls are necessary. Consequently, the planning of the installation is simplified and installation costs are saved.
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Advantages of IP enclosure
Instead of traditional transformer bays, simple IP enclosures can be used for access prevention and protection of cast resin transformers. IP enclosures come in different types and colours depending on the client’s needs and preferences.
Possibility of significant increase in performance
Through optimized forced ventilation there is an increase in performance of about 40%.
High short-time overload capability
Current density in the windings of cast resin transformers is considerably lower than in those of oil-immersed transformers. Hence, short-time load peaks, such as with wind power installations, can be easily overcome with no need to plan adequate oversizing.
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High reliability
The high technology employed in the manufacturing process of windings gives the product a high level of reliability.
Versatility and performance
Cast resin transformers can sustain overloads and perturbations taking place in every installation.
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The standard product range from POWER. Sp. z o.o. covers distribution cast resin transformers from 50kVA up to 5000kVA, with insulation class up to 36kV, with Eco-design, reduced or standard losses:

TPZ3S (Distribution transformers with standard losses)
Table 1.1
TRANSFORMERS UP TO CLASS 12KV – STANDARD LOSSES (CoBk)
Power (kVA) 50 100 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150
Uk% 4 4 4 4 4 4 6 6 6 6 6 6 6 6 6 6
Po (W) 300 440 610 715 820 960 1150 1300 1500 1800 2100 2500 2800 3600 4300 5300
Pk75˚ (W) 1250 1760 2380 2690 3090 3620 4330 5390 6460 7960 8840 10610 12830 15920 18580 23000
Pk120˚ (W) 1420 2000 2700 3050 3500 4100 4900 6100 7300 9000 10000 12000 14500 18000 21000 26000
Lpa (dB) 48 59 62 64 65 67 68 69 70 71 73 75 76 78 81 83
Length (mm) 1040 1100 1200 1300 1300 1300 1400 1400 1500 1500 1600 1700 1700 1800 1800 2100
Width (mm) 670 670 670 670 670 820 820 820 820 1000 1000 1000 1000 1300 1300 1300
Height (mm) 1100 1200 1200 1300 1300 1400 1400 1500 1600 1700 1800 1900 2200 2200 2300 2500
Wheels Distance (mm) 520 520 520 520 520 670 670 670 670 820 820 820 820 1070 1070 1070
Wheels Ø  (mm) 125 125 125 125 125 125 125 125 125 125 125 125 200 200 200 200
Weight (kg) 400 510 770 890 1020 1140 1300 1510 1800 2110 2450 2820 3350 3980 4830 5710

Table 1.2
TRANSFORMERS UP TO CLASS 24KV – STANDARD LOSSES (CoBk)
Power (kVA) 50 100 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150
Uk% 4 4 4 4 4 4 6 6 6 6 6 6 6 6 6 6
Po (W) 480 600 870 990 1100 1280 1200 1450 1650 2000 2300 2800 3100 4000 5000 6000
Pk75˚ (W) 1410 1540 2210 2630 3050 3690 4860 5790 6720 8310 9730 11500 14150 15920 20350 24770
Pk120˚ (W) 1570 1750 2500 2980 3450 4170 5500 6550 7600 9400 11000 13000 16000 18000 23000 28000
Lpa (dB) 49 59 62 64 65 67 68 69 70 72 73 75 76 78 81 83
Length (mm) 1040 1100 1100 1300 1300 1300 1400 1400 1500 1600 1600 1800 1800 1900 2100 2100
Width (mm) 670 670 670 670 670 820 820 820 820 1000 1000 1000 1000 1300 1300 1300
Height (mm) 1100 1200 1200 1300 1300 1400 1400 1500 1600 1700 1800 2000 2200 2300 2300 2500
Wheels Distance (mm) 520 520 520 520 520 670 670 670 670 820 820 820 820 1070 1070 1070
Wheels Ø  (mm) 125 125 125 125 125 125 125 125 125 125 125 125 200 200 200 200
Weight (kg) 430 580 820 960 1090 1220 1400 1590 1790 2190 2600 3100 3600 4260 4920 5890

Table 1.3
TRANSFORMERS UP TO CLASS 36KV – STANDARD LOSSES (CoBk)
Power (kVA) 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150
Uk% 6 6 6 6 6 6 6 6 6 6 6 6
Po (W) 1280 1500 1650 1950 2200 2700 3100 3600 4200 5000 5800 670
Pk75˚ (W) 3360 4150 4770 5840 6630 7960 9730 11500 14150 16370 19910 24330
Pk120˚ (W) 3800 4700 5400 6600 7500 9000 11000 13000 16000 18500 22500 27500
Lpa (dB) 67 68 69 70 71 72 73 75 76 78 81 83
Length (mm) 1500 1500 1500 1600 1800 1800 1800 1900 2100 2100 2300 2400
Width (mm) 670 670 820 820 820 1000 1000 1000 1050 1300 1300 1300
Height (mm) 1600 1700 1800 1800 2000 2200 2300 2400 2700 2700 2800 2900
Wheels Distance (mm) 520 520 670 670 670 820 820 820 820 1070 1070 1070
Wheels Ø  (mm) 125 125 125 125 125 125 125 200 200 200 200 200
Weight (kg) 1530 1650 1820 2040 2480 2760 3130 3640 4320 5090 6300 7470

TPZ3R (Distribution transformers with reduced losses)
Table 2.1
TRANSFORMERS UP TO CLASS 12KV – REDUCED LOSSES (BoBk)
Power (kVA) 50 100 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150
Uk% 4 4 4 4 4 4 6 6 6 6 6 6 6 6 6 6
Po (W) 230 330 450 540 610 750 880 1000 1150 1300 1500 1800 2200 2600 3200 3800
Pcc75˚ (W) 1250 1760 2380 2690 3090 3620 4330 5390 6460 7960 8840 10610 12830 15920 18580 23000
Pcc120˚(W) 1420 2000 2700 3050 3500 4100 4900 6100 7300 9000 10000 12000 14500 18000 21000 26000
Lpa (dB) 41 51 54 56 57 59 60 61 62 65 67 69 71 73 75 77
Length (mm) 1040 1100 1200 1300 1300 1300 1400 1400 1500 1500 1600 1700 1700 1800 1800 2100
Width (mm) 670 670 670 670 670 820 820 820 820 1000 1000 1000 1000 1300 1300 1300
Height (mm) 1100 1200 1200 1300 1300 1400 1400 1500 1600 1700 1800 1900 2200 2200 2300 2500
Wheels Distance (mm) 520 520 520 520 520 670 670 670 670 820 820 820 820 1070 1070 1070
Wheels Ø (mm) 125 125 125 125 125 125 125 125 125 125 125 125 200 200 200 200
Weight (kg) 410 540 760 900 1040 1150 1320 1490 1750 2120 2520 2880 3400 4120 4890 5660

Table 2.2
TRANSFORMERS UP TO CLASS 24KV – REDUCED LOSSES (BoBk)
Power (kVA) 50 100 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150
Uk% 4 4 4 4 4 4 6 6 6 6 6 6 6 6 6 6
Po (W) 300 400 580 570 800 950 940 1100 1250 1500 1800 2100 2400 3000 3600 4300
Pcc75˚ (W) 1410 1540 2210 2960 3050 3690 4860 5790 6720 8310 9730 11500 14150 15920 20350 24770
Pcc120˚(W) 1570 1750 2500 3350 3450 4170 5500 6550 7600 9400 11000 13000 16000 18000 23000 28000
Lpa (dB) 49 51 54 56 57 59 60 61 62 64 65 67 68 70 71 74
Length (mm) 1040 1100 1300 1300 1300 1400 1400 1400 1500 1600 1600 1800 1800 1900 2100 2100
Width (mm) 670 670 670 670 670 820 820 820 820 1000 1000 1000 1000 1300 1300 1300
Height (mm) 1100 1200 1200 1200 1300 1400 1400 1500 1600 1700 1800 2000 2200 2300 2300 2500
Wheels Distance (mm) 520 520 520 520 520 670 670 670 670 820 820 820 820 1070 1070 1070
Wheels Ø (mm) 125 125 125 125 125 125 125 125 125 125 125 125 200 200 200 200
Weight (kg) 460 600 860 920 1170 1320 1340 1660 1840 2330 2860 3230 3860 4340 5170 6240

Table 2.3
TRANSFORMERS UP TO CLASS 36KV – REDUCED LOSSES (BoBk)
Power (kVA) 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150
Uk% 6 6 6 6 6 6 6 6 6 6 6 6
Po (W) 1100 1250 1300 1500 1600 1900 2250 2600 3000 3500 4200 5000
Pcc75˚ (W) 3360 4150 4770 5840 6630 7960 9730 11500 14150 16370 19910 24330
Pcc120˚(W) 3800 4700 5400 6600 7500 9000 11000 13000 16000 18500 22500 27500
Lpa (dB) 64 65 65 67 68 69 70 72 73 74 78 81
Length (mm) 1500 1500 1500 1600 1800 1800 1800 1900 2100 2100 2300 2400
Width (mm) 670 670 820 820 820 1000 1000 1000 1050 1300 1300 1300
Height (mm) 1600 1700 1800 1800 2000 2200 2300 2400 2700 2700 2800 2900
Wheels Distance (mm) 520 520 670 670 670 820 820 820 820 1070 1070 1070
Wheels Ø (mm) 125 125 125 125 125 125 125 200 200 200 200 200
Weight (kg) 1580 1750 1910 2090 2590 2950 3230 3850 4700 5260 6470 7720

All of our transformers are manufactured in compliance with IEC 60076-11 standard and in particular meet the requirements for climatic (C), environmental (E) and fire (F) classes:

  • Climatic class C2: Transformers suitable for working, transportation and storage at temperatures down to -25°C.
  • Environmental class E2: Transformers suitable for working in environment where they can be subject to frequent condensation, heavy pollution or a combination of the two.
  • Fire class F1: Transformers exposed to a fire hazard. They are characterized by restricted inflammability, low emission of toxic substances and opaque fumes.

Each and every transformer undergo a series of routine tests in compliance with IEC60076-11 at our own testing room, which include:

  • Measurement of winding resistance
  • Measurement of voltage ratio and check of phase displacement
  • Measurement of short-circuit impedance and load losses
  • Measurement of no-load losses and no-load current
  • Insulation test of MV against LV and earth
  • Insulation test of LV against MV and earth
  • Overvoltage test
  • Measurement of partial discharges

On customer’s request, the following type and special tests can be conducted:

  • Noise level measurement
  • Temperature rise test
  • Impulse test
SPECIAL APPLICATIONS
STANDARD ACCESSORIES
ACCESSORIES UPON REQUEST
SPECIAL EXECUTIONS

Our design and construction capacity can satisfy all various needs as to different types and applications of transformers:

  • Autotransformers
  • Transformers for 6-12-18-24-36 pulse converters
  • Photovoltaic application
  • Wind power transformers
  • Earthing transformers
  • Reactors
  • HV-HV transformers and LV-LV transformers
  • Application for traction and for testing rooms
  • 3 PT100 probes for windings temperature
  • 4 lifting eyebolts
  • 4 bidirectional wheels
  • 2 earthing links
  • Identification plate
  • Tapping terminal board on MV side
  • CE marking
  • MV and LV terminals brought to the side of the transformers
  • MV or LV terminals in the bottom
  • MV and LV windings in copper
  • LV in cast encapsulate coils
  • Transformers with over temperature in class B
  • Installation above 1000 m a.s.l.
  • Ambient temperature above +40˚C
  • Ambient temperature below -25˚C