نتایج جستجو برای: protection method
تعداد نتایج: 1791871 فیلتر نتایج به سال:
There are reasons to expect that the protection switching times of p-cycles will allow them to be considered for protecting services where previously only 1+1 automatic protection switching would have been specified, for the highest speed. Here we introduce p-cycles as an option in a mixedmethod environment to protect demands that do not strictly require dedicated 1+1 APS, but need a faster swi...
Synchrophasor measurements from Phasor Measurement Units (PMUs) are the primary sensors used to deploy Wide-Area Monitoring, Protection and Control (WAMPAC) systems. PMUs stream out synchrophasor measurements through the IEEE C37.118.2 protocol using TCP/IP or UDP/IP. The proposed method establishes a direct communication between two PMUs, thus eliminating the requirement of an intermediate pha...
In recent years, based on the growing importance of clean energy in comparison with conventional energy production from fossil fuels, DG systems are gradually becoming more popular all over the world. These resources solve many problem of system. However, these resources create some other problems too. One of the most problem of DGs is unwanted islanding. This paper addresses reliable passive i...
The analysis of transient stability in electric power systems and the penetration coefficient of scattered productions play important roles in the regulation of protective equipment, so these parameters should be considered two main factors in the electrical protection of power networks. Overcurrent relays are used as one of the simplest and most effective solutions for power system protection....
Abstract: Nowadays, the use of distributed generation (DG) has increased because of benefits such as increased reliability, reduced losses, improvement in the line capacity, and less environmental pollution. The protection of microgrids, which consist of generation sources, is one of the most crucial concerns of basic distribution operators. One of the key issues in this field is the protection...
a critical protection requirement for grid connected distributed generators (dg) is anti-islanding protection. in this paper, a new islanding detection method for any possible network loading is proposed based on utilizing and combining various system parameter indices. in order to secure the detection of islanding, eight intentional disturbances are imposed to the system under study in which t...
Introduction: Occupational hearing loss due to noise is completely preventable and using the hearing protection device is one of control proceedings by the workers expose the impermissible noise. Therefore, this study aimed to determine the effective factors on occupational hearing loss and also the effective factors on using hearing protective devices by the workers exposed to excessive noise....
Introduction: Radiation has a negative biologic effect, which depends on the duration of exposure and dose. This study aimed to assess knowledge of the principles of radiation protection among medical staff in educational hospitals in Bandar Abbas University of Medical Sciences. Materials and Methods: This descriptive cross-sectional study was carried out on 105 health workers who were exposed ...
Government agencies routinely release various public use microdata files (PUMF) at the respondent level such that outside researchers can perform various statistical analyses according to their own needs and verify results published by government agencies. There are mainly two equally critical but conflicting goals when releasing PUMF: maximizing the “openness” of its operation and preserving t...
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