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The paper describes how different parameters from vacuum circuit breaker influence the closing and opening time. Operational voltage, ambient temperature or hydraulic pressure can introduce delays in opening and closing the circuit breaker. These parameters are motorized through sensors that send all the data to a control unit. The control unit calculates the decision/(time) when to make controlled...
This article is devoted to the research of diagnostics and monitoring of power supply devices of railway automation and remote control. The analysis of failure statistics of power supply devices in recent years has been carried out and the most vulnerable elements of power supply systems have been identified on its basis. Objects are described, the state of which must be diagnosed in the input devices,...
In order to accurately predict the working temperature of isolation switch contact, the 110kV isolation switch for substation in Wufeng country of Zhaotong City, Yunnan province is regarded as the research object. The working temperature of isolation switch contact for passive wireless sensor acquisition is regarded as measured value, using linear neural network and BP neural network to respectively...
As electrolytic capacitor is apt to fail in power system, it is very important to monitor its ESR and C. A novel online monitoring method of capacitor's ESR and C for DCM Flyback Converter is proposed in this paper. Based on the ac component of capacitor voltage, the calculation model is founded. The method needs no current sensor and is effective for the converter operating at any switching frequency...
Junction temperature is a critical indicator for health condition monitoring of power devices. Concerning the reliability of emerging silicon carbide (SiC) power semiconductors due to immaturity of new material and packaging, junction temperature measurement becomes more significant and challenging, since SiC devices have low on-state resistance, fast switching speed, and high susceptibility to noise...
In this paper we have provided public Smart Assistance in Public Transport System. The project is to be implemented for public bus (for ex: PMTs in Pune). It has the entire smart assistance system required for public security and safety. The smart system includes safety for women as well. It has accident detection and monitoring facility. It also has user friendly application for user to track bus...
SF6 based Gas Insulated Switchgear (GIS) are widely used for High Voltage (HV) applications. Due to the environmental impact of SF6 gas, strict regulations have been laid to monitor their use and to restrict their emission from switchgears. Quartz based resonant density sensor is the best technology commercially available today for SF6 monitoring. Frequency response of the sensor is a function of...
Spin-transfer torque random access memory (STT-RAM) and magnetoelectric random access memory (MeRAM) are promising non-volatile memory technologies. But STT-RAM and MeRAM both suffer from high write error rate due to thermal fluctuation of magnetization. Temperature and wafer-level process variation significantly exacerbate these problems. In this paper, we propose a design that adaptively selects...
A combined substation monitoring system based on ATT7022B and RS-485 was designed in this article. The monitor terminal communicates with each other in a cascading fashion through RS-485 bus. The data about electrical parameters and switching value were collected to send to the monitoring center in order to realize the function of remote control and collect meter reading. Also, the article shows the...
Controlled switching has been used for years to minimize switching transients in power systems. In a specific case several years ago, commissioning of a controlled switching system was initially not successful; the source of the problem was found to be in the circuit breaker (CB). However, detailed analysis proved challenging as it was difficult to distinguish whether the cause was electrical (long...
The mining sector is a vital contributor to the economy of South Africa. This sector, however, consumes 15% of the country's electrical energy. Deep mine operations require ventilation and cooling (VC) systems, which can account for up to 25% of the mine's electricity cost.
Data with increasing bandwidth requires future general-purpose as well as application specific microprocessors to improve performance endlessly. Transistor scaling, novel transistor structures, novel state-of-art VLSI design techniques and new computer architectures are the key drivers for boosting power and performance of microprocessors. Unfortunately, the processor cooling technique is unable to...
We report the results of destructive and nondestructive heavy ion single-event effects (SEE) testing of the Intersil ISL71840SEH hardened 16-channel analog multiplexer, prefaced by a brief discussion of its functionality, electrical specifications and fabrication process.
A more predictive maintenance approach for railway point machines can lead to fewer delays, lower operating costs, and improved safety for the railway industry. However, achieving this improvement in reliability, availability, and maintainability, necessitates the development of a predictive monitoring system for the fleet of point machines. This monitoring system would include acquiring the appropriate...
The purpose structure of the Smart Grid within the industrial electric networks is proposed. The most important part of the intelligent systems for continuous control and diagnostics of the power transformers is mentioned. The paper considers functions of the systems for diagnostics of technical state of the high-voltage transformer equipment. Monitoring systems introduced at the power transformers...
This paper presents a reconfigurable patch antenna controlled by a thermal switch for temperature monitoring. A double-patch antenna is evolved from a simple patch antenna to satisfy the radio frequency identification (RFID) chip matching requirement. A slot and a thermal switch are incorporated into the antenna’s left patch to reconfigure the resonant frequency of the antenna according to the temperature...
As electrolytic capacitor is apt to fail in power circuits, it is very important to monitor its electrical parameters, mainly the equivalent series resistance (ESR) and capacitance (C). A novel non-invasive online monitoring method of capacitor's ESR and C for CCM buck converter is proposed in this paper. Based on the ac component of capacitor voltage, the calculation model is founded. By sampling...
This paper presents a reconfigurable slotted patch antenna controlled by a thermal switch for temperature monitoring. The dimensions of the slotted patch antenna are designed to match a UHF RFID chip. In order to monitor the temperature of surrounding environment, a slot and a thermal switch are incorporated into the antenna's left patch to reconfigure the resonant frequency. Frequency deviation between...
In the past 10 years, motors rated 3.3 kV and above are increasingly being fed from voltage source, pulse width modulated converters to control motor speed and power output. Such converters produce short risetime voltage impulses that can accelerate the aging of the stator winding turn insulation, mainwall insulation and the surface electric stress relief coatings. This paper reviews the mechanisms...
The Geo-fencing technology is one of M2M services and useful in various scenes, such as the monitoring system in prisons and nursing homes. Because these service assuming the use of the mobile terminals with the battery limit, the electric power saving is needed for the Geo-fencing technology. In this paper, we propose an effective power saving method of Geo-fencing technology.
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