When operating normally, a transformer emits a continuous, uniform, and slight “buzzing” sound due to the AC electromagnetic field. Uneven or unusual sounds are considered abnormal. The main causes and measures are
System Overvoltage
- Measure: Confirm against the transformer’s nameplate parameters.
Overload Operation
- Measure: Check the transformer’s operational load against its nameplate parameters.
Loose Internal Components
- Cause: Loose internal clamps, screws, or pull straps pressing the core, causing the silicon steel sheets to vibrate more and create noticeable noise.
- Measure: Open the transformer cover and secure the components.
Static or Corona Discharge
- Cause: Poor contact or grounding of metal parts in the section switch, or corona discharge from external insulation.
- Manifestation: Accompanied by a “crackling” discharge sound.
- Measure: Ensure proper contact and grounding.
Loose External Accessories
- Cause: Loose nameplates, signboards, or fan motors.
- Measure: Secure the loose external accessories according to the specific situation.
By identifying these causes and taking appropriate measures, abnormal transformer sounds can be effectively addressed to maintain proper operation.
