Device voltage fluctuation
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Last night it was rainy, with only a few flashes of lightning from time to time; it didn’t seem too serious. But why did our equipment still experience power fluctuations? I am an operator. Those who understand this topic could please explain how voltage fluctuations occur, and what factors contribute to the tendency of the device to experience such fluctuations?
Due to electrical reasons, lightning protection measures need to be strengthened
The power grid is composed of substations at various levels, particularly the 10kV circuits. With users scattered over a wide area, short-circuit or overcurrent faults are likely to occur. In the event of such a fault, the relay protection for that circuit activates to isolate the faulty circuit. The time from fault occurrence to fault clearance is 20–700 ms. During this period, the voltages of other normal circuits will drop temporarily, resulting in flickering. Additionally, summer is a season with frequent lightning storms, and the voltage in the power grid can also drop temporarily, resulting in voltage fluctuations.
Sudden voltage drops or power outages in the power supply system caused by lightning strikes, short circuits, re-closing, etc. (commonly known as voltage fluctuations). There are many reasons, mainly including inadequate lightning protection grounding, ground short circuits, power grid failures, and the simultaneous startup of multiple large-scale devices~~
The starting current of large motors is several times the rated current; improper operation can cause fluctuations in the current throughout the power grid, leading to voltage instability. Therefore, it is essential to start the motor with a low current.
In fact, along the entire circuit, as long as there is a low voltage at any point, it will provide protection against voltage fluctuations; it is recommended to add a time-delayed trip device, which will reduce the likelihood of power outages.
It’s still likely due to lightning strikes that cause circuit short circuits, as well as aging wires. Rain can also lead to short circuits and power outages, all of which can result in intermittent power supply
Everyone has analyzed this very thoroughly. In our facility, there was once an incident where a mouse entered the electrical room and bit through the power supply cables, resulting in a shutdown.
Is there an interlock relationship among the critical loads in the plant, such that if a certain critical device malfunctions, it will cause the entire installation to stop operating?
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