Section 4
1MAC050144-MB C
Protection functions
134
615 series ANSI
Technical Manual
Figure 56:
Pickup value behavior with
ENA_MULT
input activated
Phase selection logic
If the fault criteria are fulfilled in the level detector and the directional calculation, the
phase selection logic detects the phase or phases in which the measured current exceeds
the setting. If the phase information matches the
Num of pickup phases
setting, the phase
selection logic activates the timer module.
Timer
Once activated, the timer activates the
PICKUP
output. Depending on the value of the
Operating curve type
setting, the time characteristics are according to DT or IDMT. When
the operation timer has reached the value of
Trip delay time
in the DT mode or the
maximum value defined by the inverse time curve, the
TRIP
output is activated.
When the user programmable IDMT curve is selected, the operate time characteristics are
defined by the parameters
Curve parameter A
,
Curve parameter B
,
Curve parameter C
,
Curve parameter D
and
Curve parameter E
.
If a drop-off situation happens, that is, a fault suddenly disappears before the trip delay is
exceeded, the timer reset state is activated. The functionality of the timer in the reset state
depends on the combination of the
Operating curve type
,
Type of reset curve
and
Reset
delay time
settings. When the DT characteristic is selected, the reset timer runs until the
set
Reset delay time
value is exceeded. When the IDMT curves are selected, the
Type of
reset curve
setting can be set to "Immediate", "Def time reset" or "Inverse reset". The reset
curve type "Immediate" causes an immediate reset. With the reset curve type "Def time
Содержание 615 Series ANSI
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
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Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
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