Wiktor Wise
Spark gaps are electrical components that protect electronic devices from voltage surges. They are used in lightning arresters, power plants, and electrical substations. Spark gaps were also historically used in early radio transmitters, but these were replaced by vacuum tube transmitters after World War I. Today, spark gaps are still used in spark plugs to ignite fuel in internal combustion engines. However, in some cases, spark gaps have been replaced by Dairyland decouplers and over-voltage protectors, which are solid-state devices that do not require periodic testing or replacement.
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What You'll Learn
Vacuum tube transmitters
Vacuum tubes, also known as electron tubes, thermionic valves, or simply "tubes", are devices that control the flow of electric current in a high vacuum between electrodes with an electric potential difference. The thermionic type uses thermionic electron emission from a hot cathode for functions like signal amplification and current rectification. Non-thermionic types, such as vacuum phototubes, employ the photoelectric effect for light detection and intensity measurement. Vacuum tubes played a crucial role in the development of radio, television, radar, sound recording, and reproduction, as well as long-distance telephone networks and early computers.
The invention of the thermionic vacuum tube by Lee de Forest in 1907, known as the “audion" tube, was a significant advancement. This three-terminal device served as the first electronic amplifier, revolutionizing long-distance telephony and public address systems. It also offered superior technology for radio transmitters and receivers. The "audion" tube's ability to amplify signals stemmed from placing an extra electrode between the filament (cathode) and plate (anode), with the voltage applied to the control grid regulating the current flow.
While vacuum tubes have been largely replaced by solid-state devices, they remain essential in certain applications, such as satellite downlink transmitters and radar transmitters. Traveling Wave Tubes (TWTs), for example, are used in satellite uplink Earth stations and have been orbiting the Earth as downlink transmitters. Crossed Field Amplifier tubes (CFAs) are another specialized type of microwave tube used in radar transmitters.
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DC decouplers
The Rustrol® DC-Decoupler™ Model: DCD is a recent development in DC decoupling technology. It is designed to achieve DC isolation while maintaining AC coupling, ensuring effective electrical grounding. This model is superior to other decoupling devices as it is certified for use in hazardous locations, complying with the latest North American Safety Standards. The Rustrol® DC-Decoupler™ is versatile and can be used in various applications, including coupling the primary structure.
Another example of a DC decoupler is the DEHN Decoupler DASD, which decouples DC and AC potentials to provide continuous overvoltage protection. It is designed to withstand extreme electrical conditions, making it suitable for long-term, high-stakes applications. The DEHN Decoupler DASD offers advanced pipeline protection against transient voltage, ensuring system reliability and safety. It is a fail-safe choice for protecting critical systems and workers from the dangerous effects of transient voltage events, such as lightning and surges.
Spark gaps were historically used in early electrical equipment, such as spark gap radio transmitters, and are still used today in spark plugs to ignite fuel in internal combustion engines. They are also used in lightning arresters and other devices to protect electrical equipment from high-voltage transients and surges. However, spark gaps have limitations and can fail in an open state, leaving isolation joints exposed to potential arcing. Solid-state alternatives, such as transils, trisils, and neon bulbs, have been developed for lower-power applications.
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Transils and trisils
When choosing between a Transil and a Trisil, it is important to consider their different behaviours. The current-handling capability of a Transil depends on the breakdown voltage, but this is not the case for a Trisil. For example, the Transil series 1.5KE and the Trisil family TPB exhibit different behaviours in terms of current suppression, even though they belong to the same package.
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Metal oxide varistors (MOVs)
MOVs have a unique voltage-current characteristic: at low voltages, they have high electrical resistance, but as the voltage increases, the resistance decreases. This makes them ideal for protecting sensitive electronics from sudden high-voltage events like lightning strikes or power spikes. When a small voltage is applied across the electrodes, only a tiny current flows due to reverse leakage through the diode junctions. However, when a large voltage is applied, the diode junction breaks down, resulting in a large current flow. This non-linear behaviour allows MOVs to act as protective gates, remaining inactive during normal voltage conditions but quickly responding to voltage spikes by providing a path for the additional current, thereby safely absorbing the spike.
MOVs are commonly used in consumer electronics, household appliances, telecom equipment, and computers to provide overvoltage protection and suppress voltage surges. They are also used in power supplies and electrical circuits to guard against excessive transient voltages. MOVs are critical devices for protection in electrical circuits, ensuring that sensitive electrical or electronic equipment is not damaged by high-voltage events.
While MOVs offer excellent protection, they are susceptible to cumulative degradation over time as surges occur. This degradation may not be visibly apparent, but the MOV's capacity to provide protection diminishes. Eventually, the MOV may fail catastrophically if it cannot successfully limit a very large surge, such as a lightning strike. Therefore, it is important to consider the energy rating of MOVs, as higher-rated MOVs can accommodate more transient pulses and have longer life expectancies.
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Gas tube arresters
Compared to spark gaps, gas tube arresters offer improved performance and reliability in voltage surge protection. They are designed to handle higher voltage surges and provide faster response times. Additionally, gas tube arresters can be more compact, making them suitable for board-level circuit protection and automotive environments.
In conclusion, gas tube arresters are a crucial advancement in voltage surge protection, offering enhanced capabilities and reliability compared to their predecessor, the spark gap. They play a vital role in safeguarding sensitive electronic equipment and circuits from potential damage caused by high-voltage surges and lightning strikes.
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Frequently asked questions
A spark gap is a device that consists of a rotating electrode on a disc that bridges the gap between two fixed electrodes.
The purpose of a spark gap is to safeguard buildings and electronic equipment from the devastating effects of an electrical discharge caused by lightning.
Transils, trisils, and neon bulbs are solid-state alternatives to spark gaps for lower-power applications. Dairyland decouplers and over-voltage protectors are also alternatives to spark gaps.
Spark gaps are used in spark plugs, lightning arresters, high-voltage switches, large power transformers, power plants, and electrical substations.
