Hazards of Power Supply Voltage Exceeding Transformer Rated Voltage
A transformer is a static electrical device used to transform alternating voltage and current for transmitting AC electrical energy. Its operating principle is electromagnetic induction. Structurally, a transformer consists of two or more coil windings wound on the same iron core. The windings are linked by an alternating magnetic field and operate based on the principle of electromagnetic induction.
When AC current is applied to the primary winding, an alternating magnetic flux is generated. Through the magnetic conduction effect of the iron core, this alternating magnetic flux induces an AC electromotive force in the secondary winding. The magnitude of the induced electromotive force in the secondary winding is proportional to the number of winding turns.
However, the transformer itself has a rated voltage as a constant parameter. If the input power supply voltage exceeds this constant, it will inevitably cause harm to the transformer and even the entire power system. Let’s analyze the hazards:
Hazards to the Transformer:
During operation at the rated voltage, the magnetic flux density in the iron core is already close to saturation. If the input voltage exceeds the rated voltage, the excitation current will increase sharply, causing the transformer temperature to rise and potentially burning out the windings. When the voltage reaches 105% of the rated voltage, high-order harmonics will be generated, increasing the electromotive force and damaging the winding insulation. Additionally, the secondary side voltage will also rise accordingly, leading to overloading of electrical equipment or even insulation breakdown and burnout.
Hazards to Electrical Equipment:
When the voltage is too high, the increase in magnetic flux causes the current to surge significantly. The rise in current leads to electrical equipment operating under overload conditions, which, over time, will shorten the lifespan of the devices.
The above outlines the hazards of power supply voltage exceeding the transformer’s rated voltage. Using transformer products within the correct and reasonable range is crucial for ensuring voltage quality and improving power efficiency. For this reason, it is advisable to consult relevant sales personnel or seek professional advice when selecting a transformer power supply.
