Power Transformer Protection Setting (变压器过流速断保护整定)

Calculates the operating current setting and sensitivity check for overcurrent (OC) and instantaneous overcurrent (instantaneous trip) protection of power transformers.

⚙ Input

Transformer rated capacity Sn (kVA) Short-circuit impedance uk (%)

HV side voltage Un (kV)

LV side voltage Un (kV)

CT ratio nTA

Protection factors

Reliability coefficient Krel

Wiring coefficient Kjx

Return coefficient Kr

Overload coefficient Kgh

HV-side system short-circuit current (kA, optional)

Enter only to check the sensitivity of the instantaneous trip against faults on the HV side. Left 0, sensitivity cannot be verified.

Power Transformer Protection Setting (变压器过流速断保护整定)

⚙ Input

Protection factors

✅ Results