Causes of voltage fluctuations in homes
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Causes of Voltage Fluctuations in Homes
There are a sufficient number of objective and subjective reasons, whether natural, emergency, or human-induced, that lead to voltage fluctuations in electrical networks. Below, we will try to present the most important of these reasons.
The first cause of voltage spikes in homes is the simultaneous switching on or off of powerful household appliances.
The cause of fluctuations lies in the current parameters within our homes. Today, modern homes are filled with very powerful electrical appliances. This is extremely dangerous in homes with old electrical wiring. Even in new homes, it often happens that the electrical load is not correctly calculated when using very powerful appliances, especially if the new home is connected to old electrical grids.
In reality, the following often occurs: several powerful electrical appliances are switched on inside the house, leading to a drop in current parameters within the network. When a powerful appliance or several powerful electrical appliances are suddenly switched off, a sharp voltage surge occurs.
The second cause of voltage spikes in homes is an imbalance in the operation of the substation.
Most of the substations that supply power to distribution and transmission networks were built a long time ago. The equipment installed in these stations now suffers from significant wear and tear. In addition, many substations are operating beyond their capacity due to increased electricity consumption. As a result, equipment failures occur within the substations, leading to sudden voltage surges.
The third cause of voltage fluctuations in homes is accidents in electricity transmission networks.
Hundreds of thousands of kilometers of power lines extend across all cities. This means there is a possibility of breaks or short circuits in transmission lines. Such accidents can lead to significant voltage fluctuations.
The fourth cause of voltage fluctuations in homes is a neutral wire break.
This is perhaps one of the most common and dangerous types of faults, as it causes a significant voltage surge. Many people are harmed every year due to neutral wire breaks. In the event of a neutral wire break, electrical voltage may appear on the neutral side of all outlets inside the house. This can cause any electrical appliance plugged into the outlet to burn out.
In this case, even appliances that are turned off using a remote control can be damaged. The reason is a poor contact of the neutral line in the main distribution board of the house. If the contact is unstable, appearing and disappearing, very strong voltage distortions occur.
The fifth cause of voltage fluctuations in homes is poor grounding.
Grounding electrical appliances plays an important role in ensuring their safe use. In the event of an insulation breakdown in electrical appliances, voltage usually transfers to the appliance's body. In this case, the grounding wire acts as a drain for this emergency current. When the quality of grounding deteriorates, the probability of current parameter fluctuations increases significantly.
The sixth cause of voltage spikes in homes is significant network overload.
The electrical equipment installed in electrical substations is designed for a specific maximum capacity value for the connected load. Currently, there is a significant increase in electricity consumption within homes. The first reason is the construction of large new buildings in place of old small houses. Instead of 10 apartments, a new building may contain 100 apartments in the same area.
The second reason is the increasing number of powerful electrical appliances used. This can be observed on the facades of modern residential buildings that contain hundreds of separate air conditioning systems. This alone can add hundreds of kilowatts of power. In addition, microwave ovens, electric heaters, washing machines, and electric kettles operate, leading to a very large total power within the building.
The seventh cause of voltage fluctuations in homes is poor quality electrical installation.
If something is not working in an electrical circuit, the first place to look is for a bad contact. This is the first rule for electricians. Poor contact in an outlet or electrical point may be due to poor installation of these components or the use of cheap alloys in their contact plates.
Poor contact leads to electrical arcing. This arcing becomes a center for voltage spikes and strong harmonics. Theoretically, it would be best to have no outlets at all to avoid voltage spikes, but this is not practically possible. This means that every time a powerful electrical appliance is switched on or off, a new voltage spike may occur within the network.
The eighth cause of voltage spikes in homes is the operation of industrial equipment in an adjacent power transmission network.
Large and regular power fluctuations are observed near large industrial facilities. The operation of a powerful electric motor generates very high starting currents. These currents can return to the electrical grid as a large reactive load. Although special starters and additional surge protection devices must be installed on such equipment, voltage surges cannot always be completely avoided.
The ninth cause of voltage fluctuations in homes is the flicker effect.
Voltage fluctuations can be regular and repetitive. One possible cause of these fluctuations may be the incorrect operation of electrical appliance control equipment. Appliance regulators must switch the appliance or part of it on and off to control certain parameters.
To give a simple example, the thermostat of a water heater or an electric iron can be mentioned. When the element's temperature reaches the desired value, the appliance must switch off. It often happens that the thermostat operates too frequently, leading to wear and tear on the contacts of the circuit breaker. Worn contacts begin to produce current surges. In this case, periodic jumps in the voltage waveform can be observed.
The tenth cause of voltage fluctuations in homes is lightning strikes on transmission lines.
Lightning is one of the most obvious and powerful causes of huge voltage spikes and surges. A lightning strike on power lines can generate a very large voltage surge. Although modern power transmission systems are protected against lightning, significant surges in the network cannot be completely prevented.
Powerful lightning discharges create a high-voltage pulse that propagates along the transmission line and can reach the end-user. Although a lightning strike pulse lasts for a hundredth or a thousandth of a second, this enormous energy, which can reach thousands of volts, is sufficient to cause significant damage to electrical equipment.
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