Siemens SIPROTEC 7SJ61 Manual page 348

Multi-functional protective relay with bay controller

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Table of Contents

Technical Data

4.13 Ground Fault Protection 50N(s), 51N(s)

Logarithmic Inverse Trip Time Characteristics

Logarithmic inverse

Note: For I/51Ns PICKUP > 35 the time applies for I/51Ns PICKUP = 35

Trip time characteristics of inverse time ground fault protection with logarithmic inverse char-

t = 51Ns MAX. TIME DIAL - 51Ns TIME DIAL·ln(I/51Ns PICKUP)

SIPROTEC, 7SJ61, Manual

C53000-G1140-C210-1, Release date 02.2008