Why Does Dry-Type Transformer Make Noise?
Several main factors contribute to the noise produced by dry-type transformers:
Quality of Silicon Steel Sheets
Using old or spliced silicon steel sheets as the transformer core can cause significant noise. Conversely, using new, high-quality silicon steel sheets can greatly reduce the noise level.
Installation Site
If the site where the transformer is placed or installed is not level, it can cause the transformer to operate abnormally and generate loud noise.
Grid Voltage
When the grid voltage is too high, it increases the magnetic density of the core, thereby exacerbating the noise.
By addressing these factors, the noise level of dry-type transformers can be minimized.
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Effects of Core Rusting on Transformers
Rust on a transformer's silicon steel sheets increases core loss and reduces efficiency. It causes overheating, degrading insulation and shortening lifespan. Rust also lowers magnetic conductivity, raises iron loss, and escalates hysteresis and eddy current losses, leading to higher induced currents, increased heat, and capacity loss.
How to measure the load loss and short-circuit impedance of a transformer？
To measure transformer load loss and short-circuit impedance, apply a rated frequency sinusoidal voltage to one winding, short-circuit the others, and correct load loss to 75°C. Use voltmeters, ammeters, and power analyzers, and calculate impedance using specific formulas. Ensure accuracy by considering instrument placement and correcting measurements as needed.
What inspections are required before the transformer is put into operation?
Before a transformer is put into operation, ensure the grounding, verify protection device settings, inspect relay protection systems, confirm bushing current transformers are short-circuited, check the oil circulation cooler and breather, adjust protection settings for voltage stability, and connect the gas relay for no-load impact testing.
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Unbalanced Current in the Differential Protection Circuit of UHV Transformers
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