Layout Analysis Of Non-enclosed Constant Voltage Transformers In High-ventilation And Heat Dissipation Indoor Environments

Due to its safety and environmental friendliness, dry type transformer winding equipment is widely used in indoor power supply and distribution locations such as high-rise buildings and subways. However, the epoxy resin dry type transformer is often accompanied by vibration and noise problems during operation, which are mainly caused by the magnetostrictive effect of the iron core.

Mechanism of Magnetostriction

Magnetostriction is an inherent characteristic of silicon steel sheets. When the high voltage dry type transformer iron core is energized in an alternating magnetic field, the size of the silicon steel sheet increases slightly along the direction of the magnetic field lines and decreases in the perpendicular direction. This periodic dimensional change causes the iron core to vibrate. indoor dry type transformer Under normal operating conditions, winding vibration is much smaller than core vibration; the vibration mainly originates from the magnetostrictive effect of the core.

Impact on Equipment Operation

Vibration caused by magnetostriction, with a fundamental frequency twice the power supply frequency, not only generates noise pollution but may also lead to mechanical failures such as core loosening. Over time, long-term vibration can loosen the core clamping device, further exacerbating the vibration, creating a vicious cycle that severely affects the service life and operational reliability of dry-type transformers.

Countermeasures

To address this issue, vibration can be suppressed by optimizing the core clamping force. Furthermore, filling the core joints with flexible, high-permeability soft magnetic composite materials can effectively reduce magnetic leakage, thereby mitigating vibration caused by magnetostriction at its source. In addition, diagnosing the core condition of dry-type transformers through vibration signal monitoring has become an important direction in condition monitoring.