Dry type transformers


Dry type isolating transformer

Isolating transformer with earth screen ,provide galvanic isolation between input and output windings.
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  • 300kva isolating transformer.jpg
  • isolation transformer.jpg
  • dry type isolation transformer.jpg
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  2. 300kva isolating transformer.jpg
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Power capacity, Input voltage and output voltage can be customized

Maintenance-free, easy to install, low comprehensive operating cost

Low loss, small noise, heat dissipation ability

Isolate dangerous voltages

Non grain core design for low remanence flux density for applications with specific in-rush current requirements

Dry type Air natural transformers are available with PT100 temperature probe and controller

Related product parameters

Mian Specification
Typeisolating step down
Capacity15 - 2500kva  (can be customized)
Voltage415V ( can be customized)
Winding materialCopper and Aluminum available
Insulation classF (155°C) / H(180°C)/ C(220°C)
Attitude1000m , 2000m
Frequency50 /60Hz
Protection classIP21
StandardAS/IEC 60076
Vector groupDyn11
Noise level60dB
Service life30 years

Factory Test

Routine Test

Type Test

Special Test

a) Measurement of winding resistance

a) Lightning impulse test

a) Partial discharge measurement

b) Measurement of voltage ratio and check of phase displacement

b) Temperature-rise test

b) Measurement of sound level

c) Measurement of short-circuit impedance and load loss

c) Short-circuit test

d) Measurement of no-load loss and current

e) Separate-source AC withstand voltage test

f) Induced AC withstand voltage test

g) Partial discharge measurement


Isolation transformer is mainly used for industrial machines, laboratory equipment, meters and instruments, medical devices, Coal mine, and so on.

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Contact us

Varelen Electric Co., Ltd

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