The UPS power supply industry has been developed for decades and UPS products have been applied to various industries. The main function of UPS is to prevent interference. The following situations are the most needed for UPS power supply:
It may be the most destructive of all disturbances, and transients fall into two sub-categories: pulsed and oscillatory. Pulse-type transients are the most common type of surge or spike, involving sudden events that increase or decrease the voltage and/or current level, and often do not exceed 50 nanoseconds in duration. It is caused by lightning, poor grounding, inductive load switches, utility troubleshooting, and other issues. Pulsed transients often result in data corruption and physical damage to the device.
Oscillating transients cause power signals to alternately increase and decrease rapidly, often when a load (such as a motor or capacitor) is suddenly shut off. One common problem associated with capacitor switching is the trip of an adjustable speed drive (ASD).
An interruption is the complete loss of the supply voltage or load current and lasts from 0.5 to 30 cycles (instantaneous), 30 cycles to 2 seconds (short-term), 2 seconds to 2 minutes (temporary) or more than 2 minutes ( continued). A common example of disruption is when all electronic equipment and fixtures in the house go out in a short period of time. Although power interruptions at home can be inconvenient, similar power loss in business situations can be costly because data can be damaged or lost completely during breaks.
3. Voltage dips or undervoltage
This is usually caused by a system fault or switching of a load with a large starting current. A voltage dip is a decrease in the AC voltage at a given frequency for 0.5 to one minute. Consider the drop in water pressure after opening multiple faucets in a single home. Over time, a sudden drop may result in serious equipment damage.
Often referred to as "buck" (although not quite correctly), undervoltage is the result of long-term power consistency problems, which can cause voltage dips in the short term. Undervoltage can cause a non-linear load, such as a computer power supply, to fail.
4. Swell or overpressure
The reverse of the voltage dip is the voltage swell, caused by the rise of the AC voltage and lasting 0.5 cycles to one minute. Common sources include high-impedance neutral connections, abrupt reductions in high-power loads, or single-phase failures in three-phase systems. Like a voltage dip, the destructive effects of a voltage swell - the degradation of electrical contacts and the destruction of semiconductors - are often overlooked for long periods of time. However, the direct, more significant result is the flashing of lights and data errors.
Similar to undervoltage, overvoltage is the result of long-term problems that cause temporary voltage surges. Over-voltage conditions can produce high current consumption and cause the device to overheat and stress.
5. Waveform distortion
Waveform distortion is any change in power quality that affects the voltage or current waveform. There are five main types of waveform distortion: DC offset, harmonic distortion, interharmonics, waveform sags, and noise. To varying degrees, they can cause damage or damage to IT equipment.
6. Voltage fluctuations
Voltage fluctuations are a series of small, randomly varying voltages caused by any load with significant current changes. A common phenomenon is the flashing of incandescent lamps.