Thermal Image Element; Direct Sequence Test - GE Multilin MIGII Instruction Manual

9.16 THERMAL IMAGE ELEMENT (49)

9.16THERMAL IMAGE ELEMENT (49)
This element considers direct and inverse components, generating a I
from the equation below:
Where:
Note: Numerical examples are for In = 5 A
1. Enable 49 function only.
2. Set the relay as follows:
Apply pure direct sequence In (IN to each phase). The relay should trip in 5.4 s (±5%).
9
9-18
49 SETTINGS GROUP
FLA
Tap / Pickup
Heating Time Constant T1
K1
MIGII Digital Protection for Electrical Machines
9 RELAY COMMISSIONING
value, and using the logarithmic curve derived
eq

9.16.1 DIRECT SEQUENCE TEST

In (5 A)
0.1 FLA (0.5 A)
9 min.
2
GEK-113188A