The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The simplification of lines plays a crucial role in map generalization and multiscale representation; however, addressing inconsistent sidedness relationships between the simplified lines and their neighboring features poses a persistent challenge. In order to preserve correct and consistent sidedness relationships following simplification, this study introduces a novel line simplification method...
An effective non-intrusive method of ultrasound-based technique that allows monitoring liquid pressure in small diameter pipeline (less than 10mm) is presented in this paper. Ultrasonic wave could penetrate medium, through the acquisition of representative information from the echoes, properties of medium can be reflected. This pressure measurement is difficult due to that echoes’ information is not...
Arc fault is one of main causes of fires which bring great loss and damage every year. It is identified that the traditional current breakers will not successfully interrupt the circuit all time, when an arc fault occurs. It is very important and necessary to find a new method to identify and interrupt the arc fault, although it is hard to be detected. This paper presents a method using wavelet transform...
this paper introduces one AC test system for OLTC which is important to transformer。The testing principle of OLTC is presented in this paper and the design of this system is given. The test circuit of including or excluding winding for transition resistance is described, design of AC test system's hardware and software are also shown. Finally, this thesis elaborates experiments that OLTC in normal...
Each year, fires caused by arc fault bring great loss and damage. But due to its similarity to working waveforms of many household appliances, arc waveforms are very difficult to detect in domestic circuits. This paper focuses mainly on how to distinguish it from a variety of electrical waveforms, and thus lays the foundation for the development of measuring equipment. Arc fault waveforms of circuits...
The short circuit current in DC (Direct Current) supply system will rise to a risk value within a few milliseconds. The current limiter must detect this fault on microsecond level to restrict the amplitude of short circuit current more effectively. For the existing method, the shunt is always employed for such fault detection, where the time to detect the fault current is relative long and hard for...
In this paper, the problem of initializing sequential circuits is present. Achieving generation the shortest sequence able to drive the circuit to a known state, regardless of the initial state, ant colony optimization (ACO) is proposed, which has been effective in combination optimization problems. In this work, sequence generation problem is described in searching over a large vector graph, it is...
Absolute dominator search is an effective topological analysis method to improve performance of computer-aided design (CAD) and automatic test pattern generation (ATPG). In this paper, we present a new algorithm for searching absolute dominators of multiple- output circuits to solve inefficient and complex computing in tradition algorithm. Compare with the tradition algorithm, the new algorithm analyzes...
Simulation based on electromagnetic topology theory was applied to analyze the relationship between internal electromagnetic interference (EMI) and external electrostatic discharge (ESD) of semi-shielded electrical equipment. The topological structure model of the equipment was built to analyze the coupling paths of external disturbance. To the aperture coupling path, a new method was adopted to determine...
To realize systematic analysis for electromagnetic susceptibility (EMS), forecast for electromagnetic compatibility (EMC), a modeling method on electromagnetic interference coupling path of digital relay in power system was presented. The simulated model of electromagnetic interference coupling path can be gotten by this method through the system identifying according to the experiment data. A mathematical...
Pressure rise of the gas due to high current arc in the arc chamber of molded case circuit breaker (MCCB) may accelerate the arc movement and improve the corresponding interruption performance. However, this pressure rise may result in a heavy stress on the enclosure of the arc chamber. The paper is devoted to calculate the pressure rise and analyze its characteristics. Based on thermodynamics and...
The wide application of wireless communications solutions brings a new radio frequency electromagnetic interference problem to electromagnetic shielding of the protection equipment in power system. The electromagnetic leakage from apertures on case of the device directly influences the EMC performance of the protection equipment. To solve this problem, the influence of apertures' shape, number, size...
In this paper, the equivalent circuit model containing two pairs of vias is established, and a hybrid method is applied, which combines the full-wave finite difference time domain (FDTD) with an S-parameter based macromodel by using the rational function approximation and circuit simulation. The electromagnetic feature of the model is described by S-parameters, result of the simulation of FDTD. The...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.