immediately when the current exceeds the set
Pickup value
and the
PICKUP
output is
activated.
The
TRIP
output of the component is activated when the cumulative sum of the integrator
calculating the overcurrent situation exceeds the value set by the inverse-time mode. The
set value depends on the selected curve type and the setting values used. The curve scaling
is determined with the
Time multiplier
setting.
There are two methods to level out the inverse-time characteristic.
•
The
Minimum trip time
setting defines the minimum operating time for the IDMT
curve, that is, the operation time is always at least the
Minimum trip time
setting.
•
Alternatively, the
IDMT Sat point
is used for giving the leveling-out point as a
multiple of the
Pickup value
setting. (Global setting:
Configuration/System/IDMT
Sat point
). The default parameter value is 50. This setting affects only the overcurrent
and ground-fault IDMT timers.
IDMT operation time at currents over 50 x In is not guaranteed.
Section 11
1MAC059074-MB A
General function block features
1078
615 series ANSI
Technical Manual
Summary of Contents for Relion 615 series
Page 1: ... RELION PROTECTION AND CONTROL 615 series ANSI Technical Manual ...
Page 2: ......
Page 39: ...Section 17 Glossary 1181 Table of contents 615 series ANSI 33 Technical Manual ...
Page 40: ...34 ...
Page 64: ...58 ...
Page 216: ...210 ...
Page 884: ...878 ...
Page 1038: ...1032 ...
Page 1136: ...1130 ...
Page 1172: ...1166 ...
Page 1180: ...1174 ...
Page 1186: ...1180 ...
Page 1192: ...1186 ...
Page 1193: ...1187 ...
Page 1194: ......
Page 1195: ......