DOC. MIE91093 Rev. 1.34
Page 45 of 145
. Continue to increase the phase shift, until the relay trips:
2
trip is found. As the relay trips, save the trip values.
. From this phase angle, slowly decrease the phase shift, until
the relay resets:
2 drop-off is found. As the relay resets,
pressing the multi-function knob drop-off values can be
saved.
From these values, compute:
1.
Angle Sector Sec= |
2 -
1|;
2.
Half angle sector Hs = Sec/2;
3.
Now, before computing the MTA, it is necessary to
verify if Hs is less or more than 90°.
a) If Hs is ≤ 90°, then: MTA = Hs +
1
b)
If Hs is > 90°, then: first compute the 180°
complement of Hs, Cs = 180° - Hs; next, compute
MTA = Cs +
1.
