IntroductionMetal Oxide Varistors (MOVs), serving as the core components of Surge Protective Devices (SPDs), critically determine overvoltage protection performance in power systems and electronic equipment.
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Lightning is a powerful force of nature that can wreak havoc on electrical systems and equipment. When lightning strikes, it generates a surge of electrical energy that can surge through power lines, causing damage to electrical equipment, appliances, and even posing serious safety risks to people.
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What are the functions and uses of the lightning arrester? When do we need a surge arrester? Where should the arrester be installed for better results?
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lightning arresters can protect our lives and property. Do you know how a lightning arrester works? What are the specific characteristics of the arrester?
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Transmission line surge arresters (TLSAs) have become an important design and mitigation alternative to improve grounding and reduce investment in overhead ground wire. However, they have also been known to experience a number of mechanical problems in service.
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Lightning Arrester is an electrical appliance used to protect electrical equipment from high transient over-voltage hazards during lightning strikes, limit the freewheeling time, and often limit the freewheeling amplitude. A lightning Arrester is sometimes called an overvoltage protector or overvoltage limiter. Next, let's take a look at the introduction of Lightning Arrester. Here are some answers.
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Malaysia’s power system operates in a region of intense lightning activity that adversely impacts performance of certain lines, such as 132 kV Kuala Krai to Gua Musang line located in the northeast and the 500 kV Ayer Tawar to Bukit Tarek line which runs along the western coast of the Malay peninsula.
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Application of gapped (EGLAs) or non-gapped (NGLAs) transmission line surge arresters (TLSAs) offers perhaps the best opportunity for power engineers to improve system reliability. However, as important as this may be, the value of using them transcends this one objective alone.
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Protection against overvoltages using gapless zinc oxide surge arresters has been accepted and adopted worldwide. In particular, assets such as transformers, cables and gas-insulated substations are highly vulnerable to transient surges from lightning and switching.
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Bushings are key components of HV substation equipment such as transformers and switchgear, allowing conductors to transfer energy from one insulating medium to another. Most typically, this is from an oil or SF6 insulation environment to air.
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Not long ago, a HV cable termination operating in a Mediterranean country experienced catastrophic failure, sending high velocity porcelain shards in all directions.
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How far from a transformer can arresters be located yet still ensure an adequate margin of protection? As explained by Jonathan Woodworth in this edited contribution to INMR, the answer is seldom simple.
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There are some 200 to 300 million distribution transformers in service worldwide. Of that population, a few hundred thousand are likely protected in a fashion similar to what is shown below, taken from a single-phase distribution line in North Africa.
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Distribution arresters have been used on power systems for over a century during which time there has been a complete changeover in housings from ceramic to polymeric. Porcelain arresters often had issues with sealing and water ingress that sometimes resulted in ‘clear sky, sunny day’ failures.
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As surge protective devices, arresters mitigate the impact of events that might otherwise trigger outages.
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A surge arrester is a device to protect electrical equipment from over-voltage transients caused by external (lightning) or internal (switching) events.
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