Home Page News Search Contact Us Language Bar فارسی English
 
 
 
Protection Riddle No.113 - mal-opration
how and why malopration is ocuure? is it advantageable or not
Author : arslan
 
#1
Wed, October 1st, 2014 - 08:44
Protection system mal-operations result from a failure, a malfunction, or an unanticipated or unplanned operation of the protective system. This can cause either incorrect isolation of a no-trouble area, or a failure to isolate a trouble area.
The reasons for incorrect operation can be one or a combination of

(1) misapplication of relays,
(2) incorrect setting,
(3) personnel errors, and
(4) equipment problems or failures (relays, breakers, CTs, VTs, station battery, wiring, pilot channel, auxiliaries, and so on).

It is practically impossible to anticipate and provide protection for the numerous possible power system problems. With the best of planning and design there will always be a potential situation that may not be ‘‘protected,’’ or an error not detected. Occasionally, these are ‘‘covered’’ by an incorrect operation that can be classified as ‘‘acceptable for the particular situation.’’ Although these are very few, they have saved power systems and minimized embarrassments.

Reference:
Protective Relaying
Principles and Applications
Third Edition
J. Lewis Blackburn
Thomas J. Domin
 
Author : Hamid - From: Iran
 
Submit Your Answer

 
 
Change Language :