A New Method for Blocking Third-Zone Distance Relays During Stable Power Swings

2016 ◽  
Vol 31 (4) ◽  
pp. 1836-1843 ◽  
Author(s):  
Don Kang ◽  
Ramakrishna Gokaraju
Keyword(s):  
New Method ◽  
Distance Relays ◽  
Power Swings

Detection of Symmetrical Faults by Distance Relays During Power Swings

2010 ◽  
Vol 25 (1) ◽  
pp. 81-87 ◽  
Author(s):  
S. Lotfifard ◽  
J. Faiz ◽  
M. Kezunovic
Keyword(s):  
Distance Relays ◽  
Power Swings

scholarly journals Prevention of Cascaded Events of Distance Relay Zone Three Using Logic Controls

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Mohamed Younes E. Henna ◽  
Sayed A. Nagy
Keyword(s):  
Transmission Line ◽  
New Method ◽  
Defense System ◽  
Distance Relay ◽  
System Parameters ◽  
Critical Situation ◽  
Cascaded Events ◽  
Distance Relays ◽  
Line Overload

This paper presents a new method to prevent cascaded events caused by zone 3 elements of distance relays due to transmission line overload by using logic controls. A proposed adaptive distance relay algorithm provides a new concept to distinguish between actual faults and flow transfers and secures time to perform remedial controls by a defense system during cascaded events. Maloperation of distance relay is a very critical situation, leading to more operation of other distance relays and finally partial or total blackout. Logic controls are used to insure the operating decision through observing the system parameters and compare it with a setting already being input to the system. When distance relay is activated and the logic controls find that the system is healthy (unfaulted) and that the activation resulted from transmission line overload not real fault, the operation signal will be blocked to protect the system from maloperation.

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