The selection of protective device primary and backup zones of protection is achieved through a protective device coordination analysis, also referred to as protection coordination study. The coordination study a coor dination study consists of the selection or setting of all series prote ctive devices from the load up stream to the power supply. In this study, a simulationbased evaluation for a smart grid based distribution system is performed. It is vital then, to investigate the cause and location of the prob. Protection coordination assessment and improvement of electrical network of an industrial complex in connection to power grid. Typically, studies begin with the main circuit devices and work down through the feeders and branches. Relay coordination analysis and protection solutions for smart grid distribution systems. If many branches are taken off one feeder, and the branch loads are similar, the largest rated branch circuit should be checked for coordination with upstream devices. Must operate when required proper system design backup to operate when main system fails to cover any parts that may fall inbetween protected zones fall in between the cracks reliability of hardware. This study is very important in order to ensure the least service interruption arising from a fault or shortcircuit.
Pdf relay coordination analysis and protection solutions. Personnel protection is accomplished by using groundfault circuit interrupters gfci in the form of gfci receptacles or gfci circuitbreakers. Facilities instructions, standards, and techniques volume 39. An experience report conference paper pdf available may 2018. Protective device coordination intuitive intelligent integrated etap star provides intelligent tools and powerful capabilities to analyze system protection and troubleshoot false trips, relay and breaker misoperation, miscoordination, and more. Introduction to protective device coordination analysis. A protection coordination study will consist of timecurrent curves tcc of all the electrical equipment, protective devices and large motors. Guide to power system selective coordination 600v and below. Pesias joint chapter protection reliability dependability. The term selective coordination refers to the selection and setting of protective devices in an electric power system in such a manner as to cause the smallest possible portion of the system to be deenergized due to an abnormal condition.
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