Short Circuit — Transformer Glossary

An abnormal low-resistance path between two conductors or between a conductor and ground, resulting in excessive current flow.

Backelectrical

Short Circuit

An abnormal low-resistance path between two conductors or between a conductor and ground, resulting in excessive current flow.

Transformers must withstand the mechanical and thermal forces of short-circuit currents without damage. The magnitude of fault current is inversely proportional to impedance: I_sc = I_rated / (%Z/100). For a 1,000 kVA transformer with 6% impedance, the maximum short-circuit current is approximately 16.7× rated current. Short-circuit withstand capability is verified through type testing per IEC 60076-5, which involves applying full short-circuit current and then verifying no deformation of windings through impedance re-measurement.

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switchgearLV SwitchgearComplete range of low voltage switchgear, capacitor banks, feeder pillars, and control panels for power distribution and power factor correction.

switchgearMV Switchgear12kV indoor distribution switchgear with vacuum circuit breakers and SF6-free design. Compatible with GIS and AIS switchgear solutions.

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ReactanceThe opposition to alternating current caused by inductance or capacitance in a circuit, measured in ohms.

Ground FaultAn unintended electrical path between an energized conductor and ground (earth), causing current to flow through an unintended path.