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Standards & complex insulation applications
Projects with voltages of 800 kV DC and 1000 kV AC represented major milestones in the development of equipment and insulators for electrical transmission. For applications where pollution is an issue or where high seismic performance is required, composite insulators have become the preferred techn
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Improving Seismic Performance of Porcelain
The weight and brittle nature of porcelain insulators make them especially susceptible to destructive harmonic frequencies. Indeed, material characteristics play a major role in equipment design under dynamic forces. While steel and aluminum are ductile and have predictable strength, porcelain is no
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Monitoring Leakage Current to Assess Insulator Pollution
Leakage currents flow across the surface of polluted insulators under wet atmospheric conditions and link closely to resulting discharge phenomena. They have a range of characteristics that include maximum amplitude, number of pulses that exceed certain amplitudes, pulse frequency, harmonic componen
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Microscopic details in porcelain suspension #insulators can impact service performance
The porcelain cap & pin suspension insulator with cemented hardware was introduced over a century ago. The external details of modern designs of this type of insulator (also commonly referred to as bells, discs or units) look almost identical to the original design – a fact that is no small trib
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Selecting Non-Gapped Line #Arresters
Although line arresters (LSAs) represent a fast-growing application in the electricity supply industry, there is still comparatively little direction to be found in the literature or in industry standards on how users can best specify desired performance characteristics. This past INMR article, cont
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Switching & lightning protection using EGLAs
The goal of a lightning proof transmission line has been attainable since the early 1990s when the first polymeric-housed transmission line arresters became available. Indeed, based on IEEE 1410 and IEEE 1243, installation of arresters on every phase of every tower of a shielded line will ensure no
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Insulators & Meteorology
Over the past 24 years of INMR’s existence there have been several tendencies when it comes to R&D for electrical power systems. A first phase, during the 1990s, focused on product innovation and examples are composite insulators and zinc oxide arresters. A second phase, starting at the turn of
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INMR's ‘high voltage family’. Take a look:
Almost everyone has a treasured family album containing vintage photos of parents, relatives and friends. INMR is no exception with its own 'high voltage family' that goes back to its start in 1993. Searching through archives filled with thousands of photos, the images below offer a unique sampling
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MOV Protection of Series Capacitor Banks
Series capacitor banks have the general purpose of increasing power flow on an existing system by reducing line impedance and consist basically of the capacitors as well as their protective system. Their application dates back to 1928 when GE installed their first such bank – rated at 1.2 MVar – at
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Monitoring technology for #surge #arresters
Surge arresters have been installed in electrical networks for decades to protect equipment against overvoltages caused by lightning or switching. While they typically show high reliability, their operating condition must still be monitored to indicate possible malfunction. The market offers devices
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Making the case for third-party certification
One of the hot topics in the power industry is how best for users to ensure that new electrical equipment and components meet expected performance requirements, as set out in the standards. Traditionally, this has been done through independent testing conducted in accredited high voltage and hig
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World's leading technical journal in the field of electrical insulators, surge arresters, bushings and cable accessories
Introduction
INMR is the world's leading technical journal in the field of electrical insulators, surge arresters, bushings and cable accessories, as well as inspection equipment & laboratory testing services for transmission and distribution applications.   


International Coverage of 55,000 readers in more than 180 countries.

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