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Hi,

there seems to be some issue regarding modelling of the no load losses of power transformers (standard model, 3 phase 3 winding transformer). PSCAD doesn't seem to accept values less than 0.001 pu (referred to transformer rating). Values greater than 0.001 pu aren't realistic for large power transformers.

Example:

Transformer rating: 300 MVA

No load losses (measured): 100 kW

No load losses [pu]: 0,00033 [pu].

PSCAD calculations return more or less constant value of P up to no load losses of 1e-3 [pu].

Maybe I should formulate the question the other way round:

What should be entered as transformer parameters in PSCAD, given that the following values obtained from measurements are available?

Winding voltages: 400/120/30 kV

Rating: 300/300/60 MVA

No load losses (measured at tertiary winding): 80 kW

Short circuit test: Pk1-2 = 600 kW, Pk1-3 = 100 kW, Pk2-3 = 100 kW.

Magnetising current: 0,04% (referred to primary side MVA).

The same question applies to core saturation curve, which is normally measured at the tertiary winding.

Thanks in advance.

there seems to be some issue regarding modelling of the no load losses of power transformers (standard model, 3 phase 3 winding transformer). PSCAD doesn't seem to accept values less than 0.001 pu (referred to transformer rating). Values greater than 0.001 pu aren't realistic for large power transformers.

Example:

Transformer rating: 300 MVA

No load losses (measured): 100 kW

No load losses [pu]: 0,00033 [pu].

PSCAD calculations return more or less constant value of P up to no load losses of 1e-3 [pu].

Maybe I should formulate the question the other way round:

What should be entered as transformer parameters in PSCAD, given that the following values obtained from measurements are available?

Winding voltages: 400/120/30 kV

Rating: 300/300/60 MVA

No load losses (measured at tertiary winding): 80 kW

Short circuit test: Pk1-2 = 600 kW, Pk1-3 = 100 kW, Pk2-3 = 100 kW.

Magnetising current: 0,04% (referred to primary side MVA).

The same question applies to core saturation curve, which is normally measured at the tertiary winding.

Thanks in advance.

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Open Feb 23, 2017 - 06:51 PM

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I have the same question. Did you find a solution how to enter the short circuit impedance?

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