Transformer cores are generally made of silicon steel sheets. Silicon steel is a type of steel containing silicon (also known as silica). The reason for using silicon steel to make transformer cores is that it is a highly permeable magnetic material, which can generate a strong magnetic induction intensity within an energized coil. This allows the volume of the transformer to be reduced. Read More

Temporary troubleshooting methods for transformer cores when shutdown is not possible: If there is an externally routed grounding wire and the fault current is relatively high, the grounding wire can be temporarily disconnected for operation. However, enhanced monitoring is required to prevent a floating potential from appearing on the core if the fault point happens to disappear. Read More

Loose yoke clamps or other metal components can cause vibration, leading to core overheating, discoloration, and scorched varnish film. Upon inspection, if the fault is severe, remove the faulty laminations for repair, leaving the intact parts untouched. When reassembling the damaged laminations, the repaired laminations should be interleaved and mixed with the intact ones. After the repair, core loss and temperature rise tests must be conducted. Read More