A protection system with alternative sensing levels of the fault currents

2011 ◽  
Author(s):  
Jeong-Tae Jin ◽  
Seung-Ho Jeong ◽  
Kwang-Won Lee ◽  
Dae-Sik Chang ◽  
Doo Hee Chang ◽  
...  
Keyword(s):  
Protection System ◽  
Fault Currents

scholarly journals Intelligent Control Frequency Microgrid in Islanded Mode by Central Protection Unit

2015 ◽  
Vol 37 ◽  
pp. 205
Author(s):  
Mojtaba Hajihosseini ◽  
Ali Akbar Abedi ◽  
Dariush Nakhaei ◽  
Mohammad Haidi Hajihosseini
Keyword(s):  
Distributed Generation ◽  
Intelligent Control ◽  
Protection System ◽  
Constant Current ◽  
Distributed Generators ◽  
Control Frequency ◽  
Fault Currents ◽  
Islanded Mode ◽  
Network Fault ◽  
User Condition

The appearance of microgrids created challenges such as microgrid protection and due to the presence distributed generation in microgrid network fault currents basically are variable.protection projects based on constant current must be upgraded.one of the major challenges, changes of microgrid frequency in islanded mode.in this paper a new protection system have provided to monitor microgrids and update current errors use extensive communication network. This system has been designed to respond to the dynamic changes in the system like connection/disconnection DG sources and changing microgrid user condition from connected network mode to islanded mode. the protection system Provided takes over control frequency microgrid in islanded mode and prevents microgrid instability. To control frequency central protection unit changes one of the distributed generators to busbar slack. Studies for the provided network sample have been done and show how the proposed protection system can run these models.

Empirical Analysis of Clinical Evaluations on Children Involved in the Child Protection System: The Role of Age and Gender

2000 ◽  
Author(s):  
Erika Felix ◽  
Anjali T. Naik-Polan ◽  
Christine Sloss ◽  
Lashaunda Poindexter ◽  
Karen S. Budd
Keyword(s):  
Empirical Analysis ◽  
Child Protection ◽  
Protection System ◽  
Age And Gender ◽  
Clinical Evaluations ◽  
And Gender
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