Voltage Regulator Technical Parameters | Standards for Measuring Voltage Regulator Specifications
The voltage stabilizer has an input voltage adaptation range. The IEC standard specifies that the input voltage can vary within ±10% of the rated value. The input range of the company's products is ±20%; it can ±50%. If the voltage goes beyond the under-voltage or over-voltage range, it will automatically trigger an audible and visual alarm and cannot stabilize the output voltage within the required range.
The output voltage regulation rate is the effect of output quantity change caused by input voltage change. When the load is at its rated value, the input voltage is adjusted from the rated value to the upper limit and lower limit within the source voltage range, and the change in output voltage is measured (single-phase 220V ±10%). The smaller this value, the better, and it is an important indicator of the performance of AC voltage regulators.
The Load Adjustment Ratio: It is the effect of output quantity change caused by load variation. By changing the load current magnitude, measure the change in output voltage (±8%). The smaller this value, the better, and it is an important indicator for evaluating the performance of AC voltage regulators.
4. The relative harmonic content of the output voltage (also known as output voltage distortion), usually represented by THD, is the ratio of the total effective value of harmonic content to the fundamental effective value. When the load is at the rated value and the input voltage distortion meets the reference conditions (generally should be less than 3%), measure the output voltage distortion at low, rated, and high input voltages, and take the highest value. The smaller this value, the better. (The Livi series voltage regulators are less than 1%; power voltage regulators have no harmonic content.)
Efficiency: It is the ratio of the output active power P0 to the input active power Pi (expressed as a percentage).
The load power factor. The capacity of voltage regulators is expressed in volt-amps (VA) or kilovolt-amps (KVA), indicating that in addition to resistive loads, there are also inductive and capacitive loads within the load, meaning there are reactive powers in addition to active power. This indicator reflects the AC voltage regulator's ability to handle inductive and capacitive loads. Generally, for AC voltage regulators, the load power factor cosφ is 0.8. When the product is 1KVA, the output active power (i.e., the ability to handle resistive loads) is significantly: 800W. If the product is expressed in 1KW (cosφ remains 0.8), S = 1000/0.8 = 1250VA. A lower load power factor value indicates a stronger ability of the power supply equipment to adapt to inductive loads.
Parameters for the AC voltage stabilizer include output power, input frequency, source frequency effect, random deviation (time drift), no-load input power, source power factor (this value differs from load power factor, and the higher the better, with 1 being the highest), source current relative harmonic content, audio noise, and more. For three-phase AC voltage stabilizers, there are also parameters such as the degree of unbalance in three-phase output voltage. Detailed definitions and testing methods for these indicators can be referred to in relevant industry standards.
