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Patch-type capacitive micromachined ultrasonic transducer for ultrasonic power and data transfer. [PDF]
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Impulse Impedance of Grounding Grids
IEEE Transactions on Power Apparatus and Systems / Technical Operations Committee, 1980A method and an empirical formula to calculate the inductance of square grounding grids fed at either centre or one of the corners is presented. Empirical formulae for the effective area and impulse coefficient for centre fed and corner fel square grids are determinel.
B.R. Gupta, B. Thapar
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The Tapered Impedance Half-Impulse Radiating Antenna
IEEE Transactions on Antennas and Propagation, 2021In this article, we introduce the tapered impedance half-impulse radiating antenna (TI-HIRA). This innovative version of the HIRA allows the direct connection of COTS, $50~\Omega $ generators to the antenna, without requiring external transformers and without using the large, blocking, plates that would be required in the traditional constant ...
Felix Vega, Fernando Albarracin-Vargas
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Impulse Impedance Measurements of Lightning Protection Earthings
2019 IEEE PES GTD Grand International Conference and Exposition Asia (GTD Asia), 2019Lightning protection earthing systems should be tested at currents with time parameters similar to those of lightnings. A method and definition of a measured value of impulse impedance are introduced. The impulse impedance was determined by a quotient of voltage drop on the tested earthing to a value of current in measure circuit. The usefulness of the
T. Horchue +3 more
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Discussion of Measurement Methods of Impulse Grounding Impedance
2018 34th International Conference on Lightning Protection (ICLP), 2018The grounding device is very important for lightning protection. However, it is difficult to measure the impulse grounding impedance because the impulse generator is cumbersome and dangerous compared with the device for power frequency test. At the same time it is difficult to generate a lightning current with a suitable waveform due to the inductance ...
Bo Zhang +5 more
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Measurement of Impulse Grounding Impedance in Frequency Domain
2010 International Conference on Intelligent System Design and Engineering Application, 2010Impulse grounding impedance cannot be described as an absolute index, because it depends on the characteristic of the impulse current waveform, soil structure type and grounding system configuration, etc. This paper presents a test system to measure the impulse grounding impedance directly in time domain, moreover, calculated and defined in frequency ...
Wu Guangning
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