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Protection Riddle No.66 - Difference between low impedence REF and high impedence REF
numerical restricted  EFR whether it is a low impedence or high impedence ref.
Author : Radhakrishna hn - From: Bengaluru
Fri, January 29th, 2010 - 23:00
Most of new numerical transformer differential relays consist both low and high impedance REF.
For more information about difference between low and high impedance differential protection you can refer to Protection Riddle No.59 
Author : Hamid - From: Iran
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