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In order to work out the accident caused by the impact or frequent current into the ground on person or equipment near the substation when transmission line tower is short-circuited, the technology of multi-point monitoring to scattered current in the ground were studied in this paper. And then the method is verified by simulation and experiment. At the same time, the scattered current of not monitored...
Resistive RAM (ReRAM) is an attractive candidate for next generation embedded nonvolatile memory [1][2], with several advantages compared to conventional flash technology. First, ReRAM is a CMOS-compatible low temperature back-end of line (BEOL) memory. There is almost no mutual impact between ReRAM element and front-end CMOS devices during the wafer processing. Second, it only needs 2∼4 extra masks,...
A hybrid balancing approach that combines active and passive balancing is presented for a modular battery management system (BMS) in electric-drive vehicles. The hybrid system combines advantages of module-level active balancing with cost-effectiveness of cell-level passive balancing. A module consists of a number of cells connected in series, with cell-level passive balancing performed within a module,...
The number of persons 65 years of age or older are increasing in Japan. Among them the number of living alone not in nursing home but in his or her own home is predicted to increase more and more. On the other hand smart meters have been prevailing in recent years. Therefore we have been developing the monitoring system for watching them by using the smart meters. We prepared two algorithms of “average...
The use of virtual instruments has a very important role in both specialized laboratories and academic ones. Because it is a modern method, it provides increased comfort in monitoring electrical circuits in the long term, as well as reduced costs of implementing and developing laboratories. This paper deals with the efficiency of virtual instruments in monitoring electrical circuits as compared to...
While being critical to the network management, the current state of the art in network measurement is inadequate, providing surprisingly little visibility into detailed network behaviors and often requiring high level of manual intervention to operate. Such a practice becomes increasingly ineffective as the networks grow both in size and complexity. In this paper, we propose vPROM, a vSwitch enhanced...
In recent years, privacy issues in the networking field are getting more important. In particular, there is a lively debate about how Internet Service Providers (ISPs) should collect and treat data coming from passive network measurements. This kind of information, such as flow records or HTTP logs, carries considerable knowledge from several points of view: traffic engineering, academic research,...
We demonstrate a battery-powered wearable respiration sensor chip, which monitors current due to the Grotthuss mechanism along the surface of a partially-oxidized silicon nanocrystal film. The current response is fast enough to follow humidity change due to human respiration. The response and recovery time are 72 and 44 ms, respectively. The sensor chip and a peripheral electrical circuit are mounted...
Phasor measurement units (PMUs) are the key measurement devices of modern power networks monitoring systems. The high accuracy and fast reporting rates required for PMU implementations ask for improvements in both hardware and software solutions. Depending on the characteristics of the monitored voltages and currents, the accuracy of PMU algorithms may represent the main contribution to the overall...
Short-circuit detection is one important feature of a gate-drive unit and a solution without a collector sense is preferable. With monitoring the gate-emitter voltage, a short can be easily detected. A circuit, which detects and turns off the short, and measurements for different shorts on high-voltage IGBTs are presented.
The Phasor Measurement Unit (PMU) is a modern instrument that measures magnitude, phase angle, frequency and rate of change of frequency (ROCOF) from voltage and current signals in electric networks. It is designed to be used in the monitoring and control of electric transmission systems. For each measurement, the PMU assigns a timestamp from an accurate time source; in this way, it is possible to...
Modern systems of traditional and alternative energy, transport systems include powerful uninterruptible power supplies (UPS), implemented on batteries of charged electrochemical current sources — accumulators. These modules ensure the functioning of the systems in case of accidents or technological failures in the operation of main power supplies. The ability to provide the given energy modes by...
In order to assess the microshock risk, the automatic detection of currents during surgery is important. To this aim, a prototype, called Protegemed, was designed. In order to introduce the device in Italian operating rooms the compliance assessment with international standards is essential. The results of some electrical safety tests and the identification of a measuring method to detect the microshock...
A new approach is presented for a personal health assistant for elderly people utilizing smartwatches. On the smartwatch, an app featuring an artificial neuronal net (ANN) analyzes the motion patterns of the smartwatch wearer. The ANN recognizes health relevant events and activities of daily living (EDLs, ADL). The system architecture of the app, the data acquisition process, the selection and design...
A CMOS integrated frequency domain near infrared spectroscopy (fdNIRS) and transcranial direct current stimulation (tDCS) is designed for simultaneous brain stimulation and monitoring. The combination of optical sensing and electrical stimulation solves the incompatibility between EEG and tDCS in both time and spatial domains. A real-time closed-loop brain stimulation can be realized for neurological...
Monitoring system was designed by using the voltage sensors and the current sensors that had been calibrated. Data acquisition system was integrated with Excel by using Visual Basic program. The system design used Atmega 8 microcontroller connected to a laptop / PC via Ethernet WIZ107SR and Netgear router. The accuracy of the photovoltaic panel output parameter reading was determined by the accuracy...
There exists a need for an affordable but effective PV power system monitoring system for small, medium and micro-sized enterprises, due to a number of factors. These factors are not necessarily all problems in SMME photovoltaic power system, but addressing these factors will undoubtedly improve the efficiency, lifespan and return of investment of a PV power system.
Monitoring voltage and currents in electric power systems can provide valuable information about the performance of the network as a whole and/or locally for specific areas and consumers. Furthermore, measurement data can be of great assistance to the validation and assessment of simulation models developed for power system studies. Lately, the noticeable increase of non-conventional types of loads,...
CoAP is a web transfer protocol that provides basic RESTful services for IoT devices. Since CoAP operates on top of UDP, CoAP must support additional congestion control and reliability mechanisms. However, CoAP is originally designed to allow implementations that do not maintain any end-to-end connection information. Thus, the default congestion control mechanisms are not capable of adapting to network...
DC ramped voltage testing is used to assess the condition of the stator windings in high voltage generator stator windings. When used to only assess the ability of an insulation system to withstand a predetermined DC voltage level, the continuous (and usually slow, typically in the order of 1 kV/min) increase in applied voltage combined with the continuous monitoring of the current often allows a...
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