State two disadvantages of time graded protection systems


(a) State two disadvantages of Time Graded Protection systems

(b) What is the preferred secondary current rating of a CT for a Differential Protection System? why is this rating preferred?

(c) State the minimum time grading interval between two relays and give reasons for this interval

(d) State the two rules of successful time grading relays

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Electrical Engineering: State two disadvantages of time graded protection systems
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