Inexpensive, nonintrusive, and easy-installation current sensors are of great help in the economical reliable operation power systems. In this article, a novel contactless sensor with small size, ultramicro consumption, self-power capability is proposed based on tunnel magnetoresistance (TMR). For measuring arbitrary line currents under an interference magnetic field, single-axis TMR chips array anti-interference method introduced. Then, designs software hardware given for ultralow-power...

Abstract Compared to discrete gas sensors, on‐chip waveguide sensors show a wide range of application scenarios due their small size, light weight, and low power consumption. An silicon‐on‐insulator methane (CH 4 ) sensor was proposed. The optimal length determined be 2.2 cm through theoretical analysis. By targeting an absorption line located at 3291 nm, measurements were conducted using the established system. 1 σ limit detection measured 662 parts‐per‐million dynamic response time 1.6 s....

Multi-functional magnetic sensors with tunable measure range can help cover different requirements from detecting weak field to sensing strong field. However, additional control system is often required realize the tunability, which increases complexity of device. In this work, we found current controlled sensitivity and linear in NiCo2O4 thin film based anomalous hall sensor. The device owns not only simple structure but also interesting signal whose linearity be by current. Ultrahigh 4900...

With the swift advancement of Smart Grid and great expansion urban distribution networks, condition monitoring sensors have emerged as a potential solution to enhance efficiency effectiveness power supply. Meanwhile sensor nodes utilized in systems are often powered by either batteries or line power. However battery-powered could suffer from limited energy supply require replacement upon depletion, leading raising cost maintenance. This paper introduces novel approach circumvent...

This paper proposes a partial state estimation of distribution network method based on nonlinear dynamical system approach. The proposed is globally convergent and can use sparse synchronized phasor measurements without the traditional requirement observability. For application voltage control or thermal limit control, enhancing accuracy amplitude phase angle required. Under this situation, we propose an enhanced formulation including measurement residual constraints constraints. IEEE...

Electric field measurement holds immense significance in various domains. The power supply and signal acquisition units of the sensor may be coupled with ground wire interference, which could result reduced accuracy. Moreover, this problem is often ignored by researchers. This paper investigated origin coupling interference electric sensors its impact on A miniature undistorted wireless transmission was compared existing D-dot, microelectromechanical systems (MEMS), optical sensors. results...

Existing deep learning (DL) algorithms are based on a large amount of training data and they face challenges in effectively extracting fault features when dealing with few-shot diagnoses. Model-agnostic meta-learning (MAML) also faces some challenges, including the limited capability basic convolutional neural network (CNN) single kernel to extract comprehensively, as well instability model due inner outer double-layer loops. To address these issues, this paper presents multi-step loss...

Magnetic sensor can contactlessly monitor current in energy system, whose portability is of great importance practice. Here we grow the Fe <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> O xmlns:xlink="http://www.w3.org/1999/xlink">4</inf> epitaxial thin film on flexible Mica substrate to realize magnetic sensor. Based anomalous hall effect, found that bar device shows high sensitivity field, even at temperature over 400K. Especially for...

Abstract. Wild fires exerts strong influences on the environment, ecology, economy and public security. However, existing hourly JMA-Himawari fire product presents large uncertainties not suitable for reliable real-time monitoring in China. To fill this gap, we proposed an adaptive NSMC-Himawari China based original Himawari source by employing a dynamical threshold fire-extraction database of ground thermal sources. According to visually-extracted reference consistence check, found...

Compared to XLPE cables, Polypropylene cable has the advantages of simple manufacturing process, high conveying capacity and recyclability, so PP will have a wide market in future it is essential study operational status cable. In this paper, physical field states under operating conditions investigated by building an electrical-thermal coupling simulation model. The results show that when current reaches 800A, electric strength distribution insulation layer tends be flat along radius cable,...

Aiming at the problems existing in operation and maintenance of distribution network present, this paper studies design remote monitoring system environmental variables room based on FNN (Fuzzy Neural Network). A intelligent power is established. fault problem system, a diagnosis method low-voltage proposed. The combination fuzzy reasoning BPNN (BP Network) adopted, that is, output used as input neural network. First, collected signal processed by set theory, then diagnosed three-layer BPNN,...

This paper proposes a fault location method for power cables based on distributed fiber optic vibration sensing technology to monitor the damage caused by cable discharge surrounding fiber-optic cables. When ground does not cause cable, proposed can accurately locate longitudinal distance between source and positioning technology. causes breakage of in same trench, could achieve precise lead ball free fall control system. The advantages disadvantages technique its application scenarios are...

Fiber Bragg grating (FBG) sensors are widely used in the field of transmission line ice monitoring, but cross-sensitivity temperature and stress seriously affects their measurement accuracy. To address this problem, paper proposed a compensation strategy based on improved back propagation (BP) neural network algorithm. A whale optimization algorithm is to optimize BP improve its performance for eliminating influence FBG sensors. issue small sample size, K-fold cross validation method adopted...

Voltage measurement of high-voltage cable is a challenge nowadays. Using non-contact voltage method, it possible to measure the at low cost and small volume. This paper proposes new method by sticking electric field sensor on surface accessories. Chebyshev integral, along accessories can be calculated. To verify feasibility this calculates distribution COMSOL Multiphysics. get higher precision chooses interval with high value as integrating range compares in different number sensors. The...

The security of smart grid highly relies on the designed, which is based charge induced principle and mutual accurate electrical quantity detection. In this paper, an electric shielding electrodes structure. field distribution sensor with piezoelectric folded cantilever actuators was for sensing units, driving capability vibration modal analysis were implemented using finite element method COMSOL Multiphysics software. simulation results show that resonance frequency structure 5930.5 Hz. At...

Gauss integral method, Chebyshev and Gauss-Legendre method are the main methods used for non-contact voltage measurement to inverse electric field. However, these don't consider influence of sensor position deviation. And distribution might be unreasonable in methods. Therefore, this paper proposed a novel optimized transmission line measurement, which combines genetic algorithm. Furthermore, sensitivity constraint condition is taken into It found that improves calculation accuracy greatly...

Magnetic sensor can contactless monitor current in energy system, whose tunable measure range is very desirable complex scenes. Here we use the Co <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</inf> Fe xmlns:xlink="http://www.w3.org/1999/xlink">3-x</inf> O xmlns:xlink="http://www.w3.org/1999/xlink">4</inf> /(PbMg xmlns:xlink="http://www.w3.org/1999/xlink">0.33</inf> Nb xmlns:xlink="http://www.w3.org/1999/xlink">0.67</inf>...