Wiktor Wise
A momentary loss of electricity, also known as a power outage or a blackout, is an unexpected event that occurs when there is a disruption in the supply of electricity, resulting in a loss of power to homes, businesses, and other facilities. Power outages can be caused by a variety of factors, including severe weather conditions, earthquakes, equipment failure, grid overload, or planned maintenance. During a power outage, the electricity supply is interrupted, leading to a partial or complete loss of power. This can affect a single circuit or multiple circuits, resulting in strange behaviour in electrical equipment. Power outages can be momentary interruptions or voltage drops, which may last from a few seconds to a few minutes, or they can be longer-lasting, depending on the nature of the issue.
| Characteristics | Values |
|---|---|
| Cause | Lightning strike, severe weather, earthquakes, equipment failure, grid overload, planned maintenance, solar storms, cyberattacks, loose wire, old/corroded breaker, thermal cycling, environmental vibrations |
| Duration | Less than a second to a few minutes |
| Impact | Loss of power to homes, businesses, and other facilities; data loss or hardware damage |
| Restoration | Power is automatically restored once the fault is cleared; backup power sources such as batteries or generators can be used during extended outages |
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Lightning strikes
The impact of lightning strikes on power grids can vary depending on the region and the frequency and intensity of lightning activity. Some areas, including parts of Africa, South America, India, Southeast Asia, and the central United States, experience more frequent and intense lightning storms due to ideal meteorological conditions. These conditions include warm temperatures and strong solar radiation, which contribute to the development of thunderstorms and the generation of lightning.
Additionally, lightning strikes can affect the grounding system of distribution lines, leading to unexpected ground potential rises and voltage differences within the distribution system. Improper grounding can pose risks to personnel safety and create electrical hazards or further equipment damage.
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Equipment failure
In addition, lightning strikes can cause voltage drops and momentary power sags, which can lead to factory equipment breakdowns and reduced production efficiency. Even if no breakdowns occur, it takes time to restart the equipment, which can cause production delays. Lightning is the main cause of long-term power outages, but typhoons and other events that cut power lines can also cause them.
Computer systems and other electronic devices containing logic circuitry are susceptible to data loss or hardware damage from sudden power losses. This includes data networking equipment, video projectors, alarm systems, and computers. Uninterruptible Power Supplies (UPS) can provide a constant flow of electricity to prevent this. UPS devices mainly use lead-acid batteries, but Voltage Dip Compensators use electric double-layer capacitors, which can handle large currents instantaneously.
Voltage drop countermeasure devices can detect and instantly back up power to prevent power problems at facilities. SANYO DENKI's voltage sag detection method can detect sags before they occur and regulate voltage to prevent output voltage and current interruptions.
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Severe weather
High winds, including those from derechos, hurricanes, and tornadoes, can blow down power lines. Lightning can also strike and damage transmission wires and substations, or even fry a home's electrical system. Heavy rains can cause flooding and mudslides that bring down wires and short circuit power systems. Winter storms can bring ice and snow that damage trees, which may fall on power lines, as well as elements of the electrical grid such as wires and transformers.
Heat waves may also strain components and systems, as increased electricity demand for cooling can overload the system. Wildfires can destroy wide swaths of land and electricity infrastructure. Tropical cyclones, including hurricanes, are another cause of power outages, and while they account for a smaller percentage of weather-related outages, they are responsible for most of the longest-lasting outages.
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Loose wires
In some cases, a loose wire can lead to a complete loss of power. This can happen when a wire becomes completely disconnected from the terminal lug of the main breaker, causing arcing, increased resistance, and heat, which can eventually lead to a loss of connection.
To identify if a loose wire is the cause of a power loss, it is important to check your breaker panel. If there are no breakers in the trip position, you can refer to the panel schedule to find the correct breaker and try turning it off and on again. If this does not restore power, the issue may lie elsewhere in the electrical system, and an electrician may be needed to identify the problem.
It is important to note that working with wiring and electrical systems can be dangerous, and it is always best to consult a qualified electrician if you are unsure or need assistance.
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Power line faults
Lightning strikes can also cause asymmetric faults, which occur when the load is not balanced on all three phases of a three-phase power system. This can lead to a ground fault, where current flows into the earth, or an open-circuit fault, where a circuit is interrupted by a failed current-carrying wire, blown fuse, or tripped circuit breaker.
Transmission and distribution systems use an automatic re-close function to restore power in the event of a transient fault. However, these faults can still cause damage both at the site of the original fault and elsewhere in the network as fault currents are generated. Persistent faults, on the other hand, are present regardless of whether power is applied and are typically caused by mechanical damage to underground power cables.
While rare, symmetric faults can also occur in transmission lines. These faults can cause severe damage to equipment even though the system remains balanced. One example is a bolted fault, where all the conductors are considered connected to the ground as if by a metallic conductor.
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Frequently asked questions
A momentary loss of electricity is when there is an interruption in the supply of electricity, resulting in a loss of power. This can be due to a momentary voltage drop, lightning, severe weather, equipment failure, or grid overload.
There are three types of power outages: "momentary voltage drop," "momentary interruption," and "power outage." Momentary interruptions and voltage drops refer to the same phenomenon but have different names. Voltage drops are usually caused by lightning strikes, which create a voltage sag.
A momentary loss of electricity typically lasts from a few seconds to a few minutes. Voltage drops caused by lightning strikes, for example, generally recover within 1/1000 to 10/1000 of a second.
Temporary losses of electricity can be caused by various factors, including loose wires, old or corroded breakers, thermal cycling, environmental vibrations, or physical objects falling on power lines. These issues can usually be resolved by a qualified electrician.
