The SBW three-phase compensated power voltage stabilizer is a device that stabilizes the output voltage. The voltage stabilizer consists of a voltage regulation circuit, a control circuit, and a servo motor, among other components. When the input voltage or load changes, the control circuit samples, compares, and amplifies the signal, then drives the servo motor to rotate, adjusting the position of the carbon brush in the voltage regulator. By automatically adjusting the turns ratio of the coil, it maintains a stable output voltage.
Technical Parameters
A. The voltage stabilizer has an input voltage adaptation range. According to IEC standards, the input voltage can vary within ±20% of the rated value. If it exceeds this range, an automatic audible and visual alarm is triggered, and the output voltage cannot be stabilized within the required range.
B. Output voltage regulation rate refers to the effect of input voltage changes on the output. When the load is at the rated value, the input voltage is adjusted upward to the upper limit and downward to the lower limit within the source voltage range, and the maximum change in output voltage (±) is measured. The smaller this value, the better, as it is an important indicator of the performance of an AC voltage stabilizer.
C. Load regulation rate refers to the effect of load changes on the output. By changing the load current, the change in output voltage (±) is measured. The smaller this value, the better, as it is also an important indicator of the performance of an AC voltage stabilizer.
D. Relative harmonic content of the output voltage (also known as output voltage distortion) is usually expressed as THD, which is the ratio of the total effective value of harmonic content to the effective value of the fundamental wave. When the load is at the rated value and the input voltage distortion meets the reference conditions (generally less than 3%), the output voltage distortion is measured at the minimum, rated, and maximum input voltages, and the highest value is taken. The smaller this value, the better.
E. Efficiency is the ratio (expressed as a percentage) of the output active power P0 to the input active power Pi.
F. Load power factor
The capacity of voltage stabilizers is expressed in volt-amperes (VA) or kilovolt-amperes (kVA). In addition to purely resistive loads, there are also inductive and capacitive loads, meaning that in addition to active power, there is also reactive power. This indicator reflects the ability of the AC voltage stabilizer to handle inductive and capacitive loads.
For general AC voltage stabilizers, the load power factor cosφ is 0.8. When the product is rated at 1 kW, the maximum output active power (i.e., the ability to handle resistive loads) is 800 W. If the product is labeled as 1 kW (with cosφ still at 0.8), it can output 1 kW of active power, and the apparent power S that can be output is S = 1000 / 0.8 = 1250 VA. A smaller load power factor value indicates that the power supply equipment is better suited to handle reactive loads.
G. Other parameters of AC voltage stabilizers include output power, input frequency, source frequency effect, random deviation (time drift), no-load input power, source power factor (this value is different from the load power factor; the larger, the better, with a maximum of 1), relative harmonic content of the source current, and audio noise. For three-phase AC voltage stabilizers, there is also the three-phase output voltage unbalance. The definitions and testing methods for these indicators can be found in relevant standards.
Scope of Application
Voltage stabilizers can be widely used in industrial and mining enterprises, oil fields, railways, construction sites, schools, hospitals, post and telecommunications, hotels, research institutions, and other sectors for electronic computers, precision machine tools, computed tomography (CT) scanners, precision instruments, experimental devices, elevator lighting, imported equipment, production lines, and other applications requiring stable voltage power supply. They are also suitable for users at the end of low-voltage distribution networks with excessively low or high voltage and large fluctuations, as well as for electrical equipment with significant load variations. They are particularly suitable for all applications requiring high waveform stability. High-power compensated power voltage stabilizers can be connected to thermal, hydraulic, and small generators.
Function Introduction
A voltage stabilizer is a power supply circuit or device that automatically adjusts the output voltage. Its function is to stabilize a power supply voltage that fluctuates significantly or fails to meet the requirements of electrical equipment within a set range, ensuring that various circuits or electrical equipment can operate normally at the rated voltage.
The earliest power voltage stabilizers used relay switching to stabilize voltage. When grid voltage fluctuated, the automatic correction circuit of the power voltage stabilizer would activate, causing internal relays to operate. This forced the output voltage to remain near the set value. The advantage of this circuit is its simplicity, but the drawbacks are low voltage stabilization accuracy and the fact that each relay switch causes a momentary interruption of power supply and generates spark interference.
This interference significantly affects the read and write operations of computer equipment, easily causing error signals and, in severe cases, damaging the hard disk.
High-quality small voltage stabilizers mostly use a motor-driven carbon brush method to stabilize voltage. This type of voltage stabilizer produces minimal interference to electrical equipment and offers relatively high voltage stabilization accuracy.