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When you run an industrial facility, electrical power system issues usually don't give you a polite warning. A circuit breaker trips out of nowhere, an arc flash risk slips past an audit, or harmonic distortion quietly cooks expensive equipment. That is where specialized electrical engineering consulting comes in.

Imagine standing in front of a brand-new high-voltage switchgear panel. Millions of dollars of equipment sits right behind those heavy steel doors. Your team is ready to energize the facility, and everybody is watching. You put your hand on the main breaker. Do you flip it and just hope for the best?

Excitation current testing can help detect winding faults such as turn-to-turn shorts, open circuits, and grounded windings.

To understand excitation current testing, it helps to start with magnetism. Every magnet has a magnetic field made up of lines of force. These magnetic lines leave the north pole and enter the south pole. The total number of magnetic field lines is called magnetic flux.

When a power or distribution transformer is disconnected from the power system, the transformer core may not return to a completely unmagnetized state. Some magnetic flux can remain in the core. This is called remnant magnetism or residual magnetism.