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Do not set the multiplier
Pickup value Mult
setting higher than necessary.
If the value is too high, the function may not trip at all during an inrush
followed by a fault, no matter how severe the fault is.
The pickup value multiplication is normally done when the inrush detection function INR
is connected to the
ENA_MULT
input.
Phase selection logic
If the fault criteria are fulfilled in the level detector, 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 module 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 operation time characteristics
are defined by the settings
Curve parameter A
,
Curve parameter B
,
Curve parameter C
,
Curve parameter D
and
Curve parameter E
.
In a drop-off situation, that is, when 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
reset", the reset time depends on the
Reset delay time
setting. With the reset curve type
"Inverse reset", the reset time depends on the current during the drop-off situation. The
PICKUP
output is deactivated when the reset timer has elapsed.
The "Inverse reset" selection is only supported with ANSI or user
programmable types of the IDMT operating curves. If another operating
curve type is selected, an immediate reset occurs during the drop-off
situation.
The
Time multiplier
is used for scaling the IDMT trip and reset times.
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
263
Technical Manual
Содержание Relion 615 series
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