1, voltage rise
The phenomenon that the square root of the power frequency voltage at a certain point in the power system temporarily rises to 1.1~1.8pu, and returns to normal after a short period of 10ms~1min is called voltage swell.
2. The reason for the voltage rise
When the single is relatively faulty, the non-fault phase voltage will rise for a short time. The large-capacity load is opened, and the increase in the large-capacity capacitor bank causes a voltage rise. For example, in the case of a C-phase short-circuit to ground fault, the voltage on the A and B phases will rise.
3, over voltage
Overvoltage may be a problem with long-term voltage swell. Overvoltage can be understood as a long-term voltage swell. Overvoltage is usually caused by incorrect power supply transformer connector settings and reduced load. This situation is common in seasonal areas, where residents' electricity consumption is reduced during the off-season, but electricity output is still the peak season's electricity output. Give a simple example. A wooden barrel with two small holes in the bottom, one hole into the water and one hole in the water. When the speed of the water is the same as the speed of the water, the water surface in the barrel will maintain a stable height. When the speed of the water is reduced, the speed of the water still remains the same, and the water level inside the barrel rises.
Overvoltage also has the same symptoms as voltage swell. Since overvoltage may last longer, overheating may be an external manifestation of overvoltage. For equipment that generates a certain amount of heat under normal environmental conditions and usage conditions, the overvoltage causes its output heat to suddenly increase. In a dense data center environment, this can cause damage. For IT organizations, the big concern is heat and its impact on today's data centers with many tightly packed blade servers.
4. What is the danger of voltage rise?
Voltage swells can cause industrial equipment data errors, flashing lights, electrical contact erosion, semiconductor damage in electronics, and insulation.
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