Section 4
1MAC050144-MB C
Protection functions
206
615 series ANSI
Technical Manual
The timer calculates the pickup duration value PICKUP_DUR which indicates the
percentage ratio of the pickup situation and the set trip time. The value is available through
the Monitored data view.
4.1.9.5
Timer characteristics
46M supports both DT and IDMT characteristics. The user can select the DT timer
characteristics by selecting the “ANSI Def. Time” or “IEC Def. Time” in the
Operating
curve
type setting. The functionality is identical in both cases. When the DT characteristics
are selected, the functionality is only affected by the
Trip delay time
and
Reset delay time
settings.
The IED provides two user-programmable IDMT characteristics curves, the “Inverse
Curve Type A” and “Inverse Curve Type B.”
Current-based inverse definite minimum type curve (IDMT)
In inverse-time modes, the trip time depends on the momentary value of the current: the
higher the current, the faster the trip time. The trip time calculation or integration starts
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
Minimum trip time
and
Maximum trip time
settings define the minimum trip time and
maximum trip time possible for the IDMT mode. For setting these parameters, a careful
study of the particular IDMT curves is recommended.
Inverse Curve Type A
The inverse time equation for curve type A is:
(Equation 5)
t[s]
Trip time in seconds
k
Set Machine time Mult
I
2
Negative-sequence current
Ir
Rated current
If the negative-sequence current drops below the
Pickup value
setting, the reset time is
defined as:
t s
k
I
I
r
[ ]
=
⎛
⎝
⎜
⎞
⎠
⎟
2
2
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