Shenil P.S

Bio: Shenil P.S is an academic researcher from College of Engineering, Trivandrum. The author has contributed to research in topics: Voltage & Signal conditioning. The author has an hindex of 1, co-authored 1 publications receiving 4 citations.

An Auto-Balancing Scheme for Non-Contact AC Voltage Measurement

Abstract: A simple, low-cost and non-contact type AC voltage measurement unit is presented here. The non-contact voltage sensor is designed to provide an output voltage that is directly proportional to the RMS value of unknown voltage being measured by the probe. The output is independent of the coupling capacitance between the probe and the insulated wire/cable under measurement. This is accomplished by a new, specially designed self-balancing signal conditioning circuit. This approach allows the sensor output to achieve less sensitivity to the variability of the probe to wire capacitances, good linearity and high accuracy over a range of voltage (0-300V) being measured. A prototype of the proposed probe and signal conditioning circuit has been designed, developed and tested in the laboratory. The result obtained established the practicality of the proposed scheme.

Low Power Contactless Voltage Sensor for Low Voltage Power Systems

Abstract: Contactless measurements represent the desirable solution in many contexts, where minimal cabling is required or, in general, cabling is not possible. This paper presents a new contactless voltage sensor for low voltage power systems. It is based on a contactless capacitive probe, which surrounds the power cable. It has two concentric electrodes insulated by a shield. A low power analog conditioning circuit evaluates the power line voltage by measuring the current in one of the capacitances of the probe. All the single stages of the circuit have been designed by using low-power rail-to-rail operational amplifiers, supplied at 3.3 V, in order to minimize the power absorption. The sensor has been characterized in various conditions, with sine waves and distorted signals, varying the frequency and the harmonic distortion. The influence of the current, flowing into the power cable, on the voltage measurement has been evaluated too. It shows a good accuracy (lower than 0.3%) from 100 V to 300 V, with a power consumption less than 5 mW.

Development of a Nonintrusive True-RMS AC Voltage Measurement Probe

Abstract: The design and development of a new nonintrusive-type true-rms ac voltage measurement probe are presented in this paper. The measurement circuit of the capacitively coupled nonintrusive voltage sensor is designed to provide an output that is directly proportional to the rms value of unknown ac voltage $\text{V}_{\mathrm {X}}$ , which contains the power frequency (50 or 60 Hz) component along with the typical harmonic frequency components due to nonlinear loads. This is accomplished by a specially designed autobalancing signal conditioning circuit. The existing noncontact probes are designed for a set frequency and will not provide accurate rms value of a signal that has multiple frequency components. The output is independent of the coupling capacitance between the probe electrode and the insulated wire/cable under measurement. Thus, the sensor has low sensitivity to the variation due to the probe-to-wire capacitance, good linearity (0.95%), and accuracy (0.88%) over a range of voltages (0–1000 V) tested. Various parameters that affect the performance of the probe are analyzed, quantified, and discussed in this paper. A prototype of the probe along with the proposed autobalancing circuit has been designed and developed. The prototype has been tested in detail to evaluate the accuracy, linearity, and repeatability. The results obtained established the practicality of the proposed scheme.

Non-intrusive DC voltage measurement based on resonant electric field microsensors

Abstract: Based on the resonant electric field microsensors with coplanar electrodes, a novel non-intrusive measurement scheme of DC power-line voltage suitable for actual product is presented in this paper. Compared with using microsensors directly without some protection, employing the proposed scheme can avoid the influence of humidity and electromagnetic disturbance on non-contact voltage measurement. A theoretical model is developed to analyze the influence of the structural parameters of the proposed measurement scheme on its sensitivity and to predict the voltage response. Furthermore, the theoretical analysis reveals that the proposed scheme obtains the DC power-line voltage non-intrusively by measuring the voltage of a floating electrode. A prototype of the non-intrusive measurement apparatus of DC power-line voltage has been developed, calibrated, and tested. The prototype shows a favorable linear response characteristic with a linearity of 0.86%. And the experimental results are in good agreement with the theoretical results. The maximum relative deviation noticed is −2.16% over a range of voltages from −1000 V to 1000 V.

Low Power Contacless Voltage Sensor for IoT Applications

Abstract: Due to advances in the fields of low power electronics, computer science and communications, the diffusion of sensors based on the Internet of Things is more and more increasing. In particular, contactless sensing principles represent enabling technologies for the IoT. This paper presents a new contactless power line voltage sensor (from 0 V to 300 V) with low power consumption in order to be suitable for IoT applications. It has been characterized with a high performance electrical calibrator showing good accuracy (lower than 1 %) at 230 V.

Research on a Non-Contact Multi-Electrode Voltage Sensor and Signal Processing Algorithm

Abstract: Traditional contact voltage measurement requires a direct electrical connection to the system, which is not easy to install and maintain. The voltage measurement based on the electric field coupling plate capacitance structure does not need to be in contact with the measured object or the ground, which can avoid the above problems. However, most of the existing flat-plate structure voltage measurement sensors are not only expensive to manufacture, but also bulky, and when the relative position between the wire under test and the sensor changes, it will bring great measurement errors, making it difficult to meet actual needs. Aiming to address the above problems, this paper proposes a multi-electrode array structure non-contact voltage sensor and signal processing algorithm. The sensor is manufactured by the PCB process, which effectively reduces the manufacturing cost and process difficulty. The experimental and simulation results show that, when the relative position of the wire and the sensor is offset by 10 mm in the 45° direction, the relative error of the traditional single-electrode voltage sensor is 17.62%, while the relative error of the multi-electrode voltage sensor designed in this paper is only 0.38%. In addition, the ratio error of the sensor under the condition of power frequency of 50 Hz is less than ±1% and the phase difference is less than 4°. The experimental results show that the sensor has good accuracy and linearity.