Timer
The
PICKUP
output is activated when Level detector sends the enabling signal.
Functionality and the time characteristics depend on the selected value of the
Enable
reference use
setting.
Table 388:
Values of the Enable reference use setting
Enable reference use
Functionality
Standalone
In the standalone mode, 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 the
Trip delay time setting in the DT
mode or the value defined by the inverse time curve, the
TRIP
output is activated.
Reference use
Communication
valid
When using the horizontal communication, the function is
forced to use the DT characteristics. When the operation
timer has reached the value of the
Minimum trip time setting
and simultaneously the enabling signal from the Current
comparison module is active, the
TRIP
signal is activated.
Communication
invalid
Function operates as in the standalone mode.
The
Enable reference use
setting forces the function to use the DT
characteristics where the operating time is set with the
Minimum trip time
setting.
If the communication for some reason fails, the function switches to use the
Operation
curve type
setting, and if DT is selected,
Trip delay time
is used. If the IDMT curve is
selected, the time characteristics are according to the selected curve and the
Minimum trip
time
setting is used for restricting too fast an operation time.
In case of a communication failure, the pickup duration may change substantially
depending on the user settings.
When the programmable IDMT curve is selected, the operation time characteristics are
defined with the
Curve parameter A
,
Curve parameter B
,
Curve parameter C
,
Curve
parameter D
and
Curve parameter E
parameters.
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 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
value of the
Reset delay time
setting 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
Section 4
1MAC059074-MB A
Protection functions
404
615 series ANSI
Technical Manual
Summary of Contents for Relion 615 series
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