First, why care about the quality of power supply?
In the "single-phase" power supply environment of the office and home, there is always a desire for a continuous 220V power supply to power the equipment in the circuit. In fact, the voltage is constantly changing. To better understand the quality of power, you can use the car on the road as a metaphor: road quality affects the life of the car, and some effects are immediately seen (such as tire wear), but some effects will take some time to be revealed. Similarly, poor power quality will increase the power consumption of the equipment; increase the cost of quality assurance, increase downtime, and reduce equipment life. When the power supply indicator exceeds the limit, the voltage/harmonic monitor (such as the VPM of the Ideal Industrial Company's voltage/harmonic monitor 61-830) will promptly inform you of the specific information.
Second, why is the voltage abnormal?
In many cases, the “circuits†that are connected to the building are relatively flat, and the “road surface†becomes rugged due to the interaction between the devices. The change in voltage (so-called "circuit") can be seen in the figure below.
For example, when you turn on the home air conditioner, the light will be dimmed because the load in the circuit is temporarily increased, which affects the voltage that maintains the brightness of the light. As shown in the figure above, the relationship between voltage and current in the circuit, the load current increases, and the voltage decreases in the corresponding period. Events like this can cause computer crashes, sensitive processing interrupts, data transfer errors, and many other issues.
Poor power quality can cause many problems that are difficult to diagnose and sometimes not. The impact of power quality varies with device sensitivity and its ability to adapt to voltage. Usually the equipment is designed to have a certain range of adaptation to the power supply. The problem is only noticed when the voltage is outside the design of the device, just as some cars are only suitable for driving on flat roads, while some cars are off-road. The voltage/harmonic monitor captures the event that caused the problem, allowing you to determine if the device problem is related to power performance and to verify that existing circuits can support the addition of sensitive equipment.
The current power fault location tool is either too simple or too complicated. Simple data logging devices typically periodically sample voltages and provide limited information. Event capture has the potential to affect your device, and important events may be missed. Complex power analyzers need to be set up and interpret recorded data, and are not designed for wall outlets. Since the appliance is directly connected to the wall outlet, this is the most important place to measure voltage.
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