Molly Ayala
Digital electric meters, also known as smart meters, are susceptible to power surges. These surges can be caused by lightning, power quality disturbances, or even animals interfering with power lines. While smart meters are designed to meet safety standards, they can still be damaged by power surges, leading to questions about their reliability. To protect against these surges, some utility companies offer meter-based surge protection programs, which help prevent over-voltage from entering homes and businesses and causing damage to electrical equipment. These programs are often available at a low monthly cost and can provide peace of mind for customers concerned about power surges.
| Characteristics | Values |
|---|---|
| Do digital electric meters have surge protection? | Breakers and fuses protect the system from the device. Metal oxide varistors (MOVs) are used to protect against high energy transients arising from lightning or grid disturbances. |
| What is the impact of power surges? | Power surges can enter through the meter and cause damage to electronics and appliances. |
| How to protect against power surges? | A meter base surge protector can be installed on the outside electric meter to prevent over-voltage from entering the home. |
| Are there any alternatives? | Yes, internal surge protectors can protect from internal power surges and direct or nearby lightning strikes that enter the home via alternate routes such as the alarm system, wiring, or satellite connections. |
| What causes power surges? | Lightning is the most common cause of power surges, but other factors include birds, squirrels, and trees interfering with power lines, construction work, demand fluctuations, and auto accidents involving utility poles. |
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What You'll Learn
Smart meters and power surges
Smart meters are integral to a growing number of industrial utilities applications, including gas and water meters, energy management, and others. They are powered by input mains, which are highly prone to high-energy transients arising from lightning or grid disturbances. These electrical power meters are susceptible to input transients and surges generated by lightning events or power quality disturbances.
Smart meters sometimes have an extension unit that goes into the user’s home while the main meter is installed at a centralized location in the building. For these applications, the home extension unit may have a Power over Ethernet (PoE) adapter. This communication cable requires additional protection because it can be susceptible to induced surges in the building.
Metal oxide varistors (MOVs) are used to protect smart meters against transient surge events. The required level of surge immunity dictates the rating and size of the MOV. For basic surge protection between 2 kV and 4 kV, a 14-mm MOV might work. However, for protection levels of 30 kV, a larger 32-mm or 34-mm MOV is needed. Breakers and fuses also protect the system from the device.
To protect the wiring from fire hazards in case of catastrophic damage in the power supply causing a short circuit, a fuse is also used at the power supply’s input front end. The meter enclosure is made using plastic to fully isolate the electronics circuit from the external world and minimize the impact of this ESD discharge. The microcontroller’s power supply and signal-sensing pins will have ESD protection diodes to protect the microcontroller from any ESD discharge that still gets coupled to it.
In addition to these protections, meter base surge protectors can be installed to prevent over-voltage from entering homes and causing damage to electronics and appliances. They are designed to be the first line of defense from power surges.
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Surge protection devices
Meter base surge protectors are designed to be the first line of defence against power surges. They monitor incoming power and direct the surge straight down to the earth ground below the electric meter, preventing it from entering the home. This type of protector is especially useful when used in conjunction with auxiliary surge protectors on telephone lines, cable services, and individual devices, as it forms a whole-home surge protection strategy.
Lightning is the most common cause of power surges, but they can also be caused by birds, squirrels, and trees interfering with power lines, as well as construction work, demand fluctuations in the home, and auto accidents involving utility poles.
There are a variety of surge protection devices available, including metal oxide varistors (MOVs), which are used to protect against high-energy transients arising from lightning or grid disturbances. MOVs are rated and sized according to the required level of surge immunity. For basic surge protection, a smaller MOV is needed, whereas protection against higher levels of voltage will require a larger MOV.
In addition to MOVs, fuses are also used to protect against power surges. Fuses help to prevent fire hazards in the event of a short circuit caused by catastrophic damage to the power supply. ESD protection diodes can also be used to protect the microcontroller from any ESD discharge.
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The impact of lightning
When lightning strikes, it generates a massive surge of electrical energy that travels through power lines and can enter buildings. This surge of energy can reach extremely high voltages, often exceeding the capacity of electrical systems and appliances. As a result, lightning strikes can cause severe damage to electrical equipment, including digital electric meters.
In the absence of adequate surge protection, a lightning strike can lead to several issues. Firstly, the high voltage can overload and damage the digital electric meter itself, rendering it inoperable. This was evident in the case of PG&E SmartMeters in East Palo Alto, where 80 meters caught fire and burned out after a power surge. Secondly, the surge can travel through the electrical circuits within a building, damaging wiring, appliances, and electronic devices connected to the power source. This can result in costly repairs or replacements for homeowners and businesses.
Additionally, lightning strikes can cause power outages and disruptions. The sudden influx of electricity can overload the electrical system, causing it to shut down temporarily. This can lead to a loss of power for homes and businesses, potentially affecting essential services and causing inconvenience and economic losses.
To mitigate the impact of lightning, surge protection devices are crucial. Metal oxide varistors (MOVs), for example, are commonly used to protect against lightning-induced surge events. These devices divert the excess voltage to the ground, preventing it from reaching and damaging sensitive equipment. Breakers and fuses can also provide an additional layer of protection by interrupting the flow of electricity in the event of a power surge, though they may not be sufficient on their own.
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The role of MOVs
MOVs, or Metal Oxide Varistors, are voltage-dependent resistors that play a crucial role in protecting electrical circuits from transient voltage surges. They are particularly useful in safeguarding vulnerable circuit components like motors, controllers, and electromagnetic brakes from potentially damaging voltage spikes.
MOVs are passive devices that offer a cost-effective solution for surge protection. They are characterised by their resistance, which varies with voltage. Under normal circumstances, when the voltage across an MOV is below the threshold voltage, it exhibits extremely high resistance, effectively having no impact on the circuit. However, during a voltage surge, the MOV's resistance drops significantly, allowing the excess current to pass through it, where it is safely dissipated as heat. This rapid drop in resistance acts as a short circuit, protecting the rest of the circuit from the damaging effects of the voltage spike.
The size and rating of an MOV are determined by the required level of surge immunity. For instance, a basic level of protection against surges ranging from 2 kV to 4 kV can be achieved with a 14-mm MOV. On the other hand, higher protection levels, such as 30 kV, necessitate larger MOVs, typically in the range of 32 mm to 34 mm.
Despite their effectiveness, MOVs have inherent limitations due to their passive nature and finite lifetimes. As they approach their end of life, MOVs can experience internal failures, leading to the formation of hotspots with high impedance. This can initiate a chain reaction, resulting in the MOV catching fire. To mitigate this risk, a thermal fuse is typically placed in close contact with the MOV. When the MOV conducts excessive current or generates excessive heat, the thermal fuse activates, opening the circuit and preventing potential fire hazards.
In conclusion, MOVs are essential components in providing surge protection for electrical circuits, particularly in DC switching applications. By offering a cost-effective solution, MOVs safeguard vulnerable circuit components from transient voltage surges, ensuring the safe and reliable operation of electrical systems.
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Preventing damage to appliances
Power surges can enter a home's electrical circuits at a very high rate of speed and can cause damage to appliances and electronic devices. To prevent damage to appliances, it is important to understand the methods and devices that can mitigate the risk of damage caused by sudden increases in voltage.
Firstly, it is recommended to invest in high-quality surge protectors for all valuable electrical appliances. Surge protectors are designed to protect plugged-in devices, and individual protectors for each high-value item can prevent overloading. For example, the Belkin Power Strip Surge Protector is a good option for home entertainment systems and any electronic equipment with multiple devices plugged into the same socket. For sensitive electronics, opt for surge protectors with EMI/RFI noise filtering to enhance their longevity. Additionally, consider the clamping voltage—the lower the better—and if the protector has a built-in indicator for protection status.
Secondly, installing whole-home power surge protection systems can block excess voltage and protect the main electrical bus bar, safeguarding large appliances and sensitive computer equipment. Whole-house protectors can also help prevent power outages caused by power surges, ensuring stability in the home's electrical system. However, it is important to note that the initial installation of a whole-house surge protector can be costly and may require professional installation by a licensed electrician.
Thirdly, ensuring proper grounding of electrical devices can significantly reduce the risk of damage associated with power surges. This includes integrating special wall outlets designed to handle sudden jumps in power and equipping the home with a surge protector at the electrical panel. Regular inspection of electrical wiring and ensuring circuit breakers are not tripped are also crucial in preventing power from flowing uncontrollably through the home during a surge.
Lastly, unplugging appliances during severe storms or electrical storms can significantly reduce the risk of damage from power surges. This is because electrical storms increase the risk of power surges entering a home's wiring. Additionally, installing a whole-home backup generator with an ATS (automatic transfer switch) and surge protector can help maintain a reliable power supply to appliances during power outages and brownouts.
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Frequently asked questions
A power surge is a sudden increase in voltage that exceeds the standard 240-volt flow of electricity that normally enters a home or building. Power surges can be caused by lightning, birds, squirrels, and trees interfering with power lines, construction work, demand fluctuations, and auto accidents involving utility poles.
A digital electric meter is a device that measures and processes energy usage data. It is typically powered by input mains, which are susceptible to high-energy transients and surges caused by lightning or grid disturbances.
Digital electric meters may have some built-in surge protection, but it is not always sufficient to protect against all types of power surges. In some cases, additional surge protection devices may be needed to fully protect the meter and connected equipment.
A meter-based surge protector is designed to be the first line of defense against power surges. It works by monitoring incoming power and redirecting potential surges to the ground, preventing them from entering the building and causing damage to electronics and appliances.
The cost of a meter-based surge protector can vary, but some companies offer them for a monthly fee of around $6 to $8 per meter, with warranties of up to $50,000 for damaged electronics if the device fails to stop a power surge.
