Voltage Regulation
The change in secondary voltage from no-load to full-load as a percentage, indicating voltage stability.
Voltage regulation measures ability to maintain stable output as load varies: %Reg = (Vnl - Vfl)/Vfl x 100%. Good regulation (2-4%) is desirable.
Worsens with higher impedance, lower PF (lagging), unbalanced loading. Leading PF can cause negative regulation (voltage rises).
Poor regulation requires larger OLTC ranges or additional equipment. Utilities specify maximum for consumer voltage limits.
QDTB optimizes impedance and winding design for excellent regulation while balancing short-circuit withstand.
Related Products
Related Terms
Impedance (%Z)
Total opposition to current flow in a transformer as a percentage, determining fault current and voltage regulation.
Load Tap Changer (LTC)
A mechanism allowing transformer tap ratio changes while energized and under load for real-time voltage regulation.
Power Factor
The ratio of real power (kW) to apparent power (kVA) indicating how effectively electrical power is utilized.
More Terms Starting with “R”
Reactor
An inductive device in power systems to limit current, absorb reactive power, or filter harmonics.
Rectifier Transformer
A transformer designed to supply rectifier/inverter loads with enhanced harmonic and DC magnetization handling.
Rated Capacity
The maximum continuous power output a transformer can deliver at specified conditions without exceeding temperature limits.
Ring Main Unit (RMU)
A compact factory-assembled HV switchgear set for ring-type or radial distribution networks.
More in “Performance Parameters”
Core Loss
Power dissipated in the transformer magnetic core due to hysteresis and eddy currents, also called iron loss or no-load loss.
Copper Loss
Power lost as heat in transformer windings due to electrical resistance, proportional to the square of load current.
Efficiency Class (IE1-IE4)
International classification for transformer energy efficiency, IE1 (standard) to IE4 (premium) with progressively lower losses.
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