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# 50 kVA Transformer Thermal Time Constant2

## 50 kVA Transformer Thermal Time Constant

(OP)
Does anyone know the thermal time constant of a 50 kVA transformer?

### RE: 50 kVA Transformer Thermal Time Constant

You may calculate it according to IEEE Std C57.96-1999 6.2.2 Calculation of transient temperature:
C = 0.106 × weight of copper winding, or C = 0.033 × weight of core and copper windings from the nameplate. C = 0.260 × weight of aluminum windings, or C = 0.044 × weight of core and aluminum coils from the nameplate.
or according to IEC 60076-12/2008 Part 5.10.2 Time constant calculation method

### RE: 50 kVA Transformer Thermal Time Constant

There are two-time constants - oil temperature time constant for heating (1-3 hours) and winding temperature time constant 5-8 minutes)

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