When a dry-type current transformer is operating normally, it can still experience faults due to external factors or other issues. One effective way to detect potential problems is by listening carefully to the sounds it makes.
Normally, a current transformer should produce a steady "humming" sound. If this sound becomes irregular or disappears altogether, and you notice that the current meter and other measuring devices show no reading or very low readings, it could indicate an open circuit on the secondary side. This often happens due to poor contact at the terminals, which may also result in sparking.
An open circuit on the secondary side can lead to dangerously high voltages, potentially causing insulation failure, grounding, or even damage to the secondary terminal. These overvoltages can also pose serious risks to human safety. Therefore, strict regulations prohibit opening the secondary side of a current transformer during operation.
Another sign to watch for is unusual noise caused by dirt or dust on the surface of the transformer, especially in wet or humid conditions. This can result in crackling sounds and visible corona discharges. If the discharge becomes severe, immediate attention and power shutdown are necessary.
A sudden "clicking" sound might indicate loose screws or increased vibration from the core. The noise level may vary with the load. If left unchecked, this can cause excessive heating, leading to insulation aging, grounding, or even complete insulation breakdown. It's crucial to address such issues promptly to avoid further damage.
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