In high tension power measurement, potential transformer (PT) and current transformer (CT) are used in order to reduce high tension voltage and current, respectively. But both PT and CT suffer from ratio error and phase angle error, which may produce severe error in power measurement. In the present paper, modified designs of PT and CT are combined to develop an electronic power measurement circuit in order to reduce the measurement errors. The modified PT and CT have reduced phase angle error and ratio error. In the power measurement circuit, the instantaneous product of the outputs of these PT and CT is determined by using a simple light emitting diode (LED)-light dependent register (LDR) or LED-LDR-based product circuit. The operation of the proto type power measurement unit designed in the present work has been experimentally tested and the measured outputs are compared with the readings of laboratory standard wattmeter. The experimental results are reported in the paper. Very good linear characteristics are observed.
It is very much important to design an efficient and reliable power conditioner with detailed study on measurement of AC parameter of solar cell (especially the cell capacitance). In this paper, we measured the capacitance of GaAs/Ge and Silicon (BSFR) solar cells under dark condition over a wide range of bias voltages using low level sine wave signal of desired amplitude. The approach of sinusoidal wave method offers the accurate and most economic way of studying the capacitance of semiconductor devices. Here frequency domain techniques have been used. It is shown that for GaAs/Ge solar cell, it exhibits only transition capacitance while Silicon (BSFR) solar cell exhibited both transition and diffusion capacitances.
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