نتایج جستجو برای: substation placement

تعداد نتایج: 77574  

Journal: :JCM 2014
Lei Chen Hao Pan Changhong Deng Feng Zheng Haijun Yan Fang Guo

Since the interactivity, integrality and instantaneity of information communication in smart substation have been improved to higher levels, it can contribute to promote the realization of a centralized type substation area backup protection (SABP), acting as an integrated protection system for whole substation. On the side, in the case that fault current limiters (FCLs) are suggested to be emp...

2017
Doan Duc Tung

This paper proposes the solutions to prevent over-voltage for the 220 kV distribution substations with several different voltage levels. The motivation comes from the failures of surge arrester number 2 of phase B at the transformer number 2 (CS2BAT2) of the Vietnamese 220 kV Thainguyen substation due to the over-voltage. The main objective is to enhance the operating stability of a scattered c...

Journal: :avicenna journal of dental research 0
masoumeh khoshhal department of periodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (hamadan university of medical sciences) fariborz vafaei department of prosthodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (hamadan university of medical sciences) banafsheh poormoradi department of periodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iran; department of periodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iran. tel: +98-9188124251, fax: +98-8138381085سازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (hamadan university of medical sciences) janet moradi haghgoo department of periodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (hamadan university of medical sciences) faezeh behgozin dentist, hamadan, ir iran neda amiri dentist, hamadan, ir iran

results the mean distances between the crestal bone and the implant shoulder in group 1 were 1.01, 1.44, and 1.93 mm at the implant placement time, and at the 6 and 12-month postoperative intervals, respectively. in group 2, these distances were 1.35, 1.20, and 1.41 mm, respectively. there were no significant differences in the marginal bone resorption between the two groups (p > 0.05). conclus...

2001
David G. Hart David Uy Vasudev Gharpure Damir Novosel Daniel Karlsson Mehmet Kaba

Phasor measurement Being able to determine phasors across the power system at a fixed point in time has the potential to solve these problems. One of the key components of future utility systems will therefore be Phasor Measurement Units (PMUs). PMUs rely on a GPS time signal for extremely accurate time-stamping of the power system information. A GPS satellite receiver (see box on page 60) prov...

2003
Wolfgang Wimmer

-In a substation, a lot of distributed, safety related functions have to be performed. IEC 61850 is intended to replace all wires by serial communication. To achieve this goal IEC 61850 has to fulfill hard real-time criteria. Starting from the definition of these criteria the communication methods of IEC 61850 are investigated. The result shows the feasibility of these methods for interlocking ...

2002
Joe Nichols Bob Matusheski

As a result of economic pressures caused by deregulation, utilities are looking at new ways to approach the business of operating and maintaining their assets. In particular, one utility has taken a look at managing their substation assets as if they were stocks in a portfolio. Like financial managers who try to maximize return-on-investment for each asset in a client's portfolio, substation ma...

2004
Fredrik Wernstedt

We present results from experiments where the effects of flow control at a single substation are compared to distributed flow control at multiple substations. The latter approach is made possible by equipping individual substations with some computing power and integrating them into a communications network. Software agents, who cooperate with other software agents (substations) and invoke time...

2011
Le Viet Dung K. Petcharaks

The economical criterion is accounted as the objective function to develop a computer program for designing lightning protection systems for substations by using masts and Matlab in this work. Masts are needed to be placed at desired locations; the program will then show mast heights whose sum is the smallest, i.e. satisfies the economical criterion. The program is helpful for engineers to quic...

2009
Qingshan SHAN P J MOORE

A measurement campaign has been carried out in 400kV air insulated electricity substation to characterise and model radio frequency impulsive noise with a view to assessing its impact on wireless network technologies. The relatively recent availability of new technologies such as WiFi, Bluetooth and Zigbee means that particular emphasis has been put on higher frequency bands (e.g. 2.4, 5 GHz) t...

2008
T. S. Sidhu

International Electro-technical Commission (IEC) has developed a new global standard, IEC 61850 for communication systems in power substations. This standard provides interoperability among the all communication devices within the substation. This paper presents basic features of communication systems proposed by IEC 61850, such as functional hierarchy, OSI-7 layer based communication, and proc...

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