time
setting, the
TRIP
output is activated. If the fault disappears before the module
operates, the reset timer is activated. If the reset timer reaches the value set with the
Reset
delay time
setting, the operation timer resets and the
PICKUP
output is deactivated. 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 in the monitored
data view.
Blocking logic
There are three operation modes in the blocking function. The operation modes are
controlled by the
BLOCK
input and the global setting in
Configuration/System/Blocking
mode
which selects the blocking mode. The
BLOCK
input can be controlled by a binary
input, a horizontal communication input or an internal signal of the protection relay's
program. The influence of the
BLOCK
signal activation is preselected with the global
setting
Blocking mode
.
The
Blocking mode
setting has three blocking methods. In the "Freeze timers" mode, the
operation timer is frozen to the prevailing value, but the
TRIP
output is not deactivated
when blocking is activated. In the "Block all" mode, the whole function is blocked and the
timers are reset. In the "Block TRIP output" mode, the function operates normally but the
TRIP
output is not activated.
4.2.4.5
Neutral admittance characteristics
The applied characteristic should always be set to cover the total admittance of the
protected feeder with a suitable margin. However, more detailed setting value selection
principles depend on the characteristic in question.
The settings defining the admittance characteristics are given in primary
milliSiemens.
The forward and reverse boundary settings should be set so that the forward setting is
always larger than the reverse setting and that there is space between them.
Overadmittance characteristic
The overadmittance criterion is enabled with the setting
Operation mode
set to "Yo". The
characteristic is a circle with the radius defined with the
Circle radius
setting. For the sake
of application flexibility, the midpoint of the circle can be moved away from the origin
with the
Circle conductance
and
Circle susceptance
settings. Default values for
Circle
conductance
and
Circle susceptance
are 0.0 mS, that is, the characteristic is an origin-
centered circle.
Operation is achieved when the measured admittance moves outside the circle.
Section 4
1MAC059074-MB A
Protection functions
386
615 series ANSI
Technical Manual
Содержание Relion 615 series
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