LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
96 views
in General by (110k points)
closed by
Plug setting Multiplier (P.S.M) of relay is the ratio:
1. pick up current to normal current
2. rated secondary current of CT to rated current of CT
3. fault current in circuit breaker to normal current
4. fault current in relay coil to pick up current

1 Answer

0 votes
by (59.9k points)
selected by
 
Best answer
Correct Answer - Option 4 : fault current in relay coil to pick up current

The plug setting multiplier of a relay is defined as the ratio of secondary fault current to the pick-up current.

PSM = Secondary fault current/Relay current setting

Pick up current = (Rated secondary current in CT) x (Current setting)

Important Point:

Time Multiplier Setting (TMS) is the ratio \(\frac{T}{{{T_m}}}\)

Where, for a given plug setting multiplier T is the desired relay operating time and Tm is the corresponding operating time.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...