نتایج جستجو برای: relay protection
تعداد نتایج: 196649 فیلتر نتایج به سال:
چکیده ندارد.
This paper is concerned with development of a technique for performance prediction of current transformers (CT), accurately. In this technique, a new optimized model from view-point of both computation time and memory is introduced in order to simulate the current transformers on digital computers. The introduced software in this paper in combination with relay tester equipments can be used ins...
Relay operations during cascading events play an important role for the power system stability. Without knowing the whole system information, distance relay may make wrong decision from the view of system reliability since it operates only according to local measurements. This paper introduces an improved transmission line protection scheme during cascading events. It utilizes the interactive m...
Electric utilities are expanding communications infrastructure due to increased need for information. Due to performance, price, and technological advances, digital communication systems are frequently chosen as this multiple user data network. This two-part paper describes the application of digital communication in power system protection. Part 1 describes the digital communications architect...
This paper reports on the development of integrated protection for power system. The background of the development is firstly introduced, in which a centralized protection system (or relay) provides the protection of multiple power plant or a substation. A novel integrated protection scheme for distribution system based on overcurrent protection technique is described. In the proposed scheme, s...
Low- impedance transformer ground differential relay is a part of power transformer protection system that is employed for detecting the internal earth faults. This is a fast and sensitive relay, but during some external faults and inrush current conditions, may be exposed to maloperation due to current transformer (CT) saturation. In this paper, a new intelligent transformer ground differentia...
حفاظت سریع و مطمئن شبکه های قدرت حین بروز خطاها و نیز سایر اغتشاشات شبکه، به منظور حفظ پایداری و محدود کردن خسارات وارده به سیستم یکی از مهم ترین موضوعاتی است که مهندسین برق در بهره برداری از سیستم های قدرت با آن مواجه هستند؛ از این رو مطالعه سیستم های حفاظتی در شبیه سازی ها از اهمیت ویژه ای برخوردار است. از طرف دیگر اثر نوسان کمیت های مختلفِ شبکه حین بروز اغتشاشات مختلف را نیز بایستی در تنظیم...
Protection history and practice has long had two relays applied for protection of one line or piece of primary equipment. The traditional approach for these relays may be to use two relays with different or identical schemes or manufacturers. There are issues of human usage and common mode failure that are considered when making a choice of how to best select these two relays. In the case of el...
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