Residual Voltage pickup value
of 1.0 × Vn corresponds then 1.0 × 20.000 kV = 20.000 kV
in primary
Residual Power pickup value
of 1.0 × Pn corresponds then 1.0 × 20.000 kV × 100 A =
2000kW in primary
If "Calculated V0" is selected for the
Vg or V0
setting, the nominal value
for residual voltage Vn is always phase-to-phase voltage. Thus, the valid
maximum setting for residual
Voltage pickup value
is 0.577 × Vn, which
corresponds to full phase-to-ground voltage in primary.
Timer
Once activated, Timer activates the
PICKUP
output. Depending on the value of the
Operating curve type
setting, the time characteristics are according to DT or wattmetric
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. 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 reset time is identical for both DT or
wattmeter IDMT. The reset time depends on the
Reset delay time
setting.
Timer calculates the pickup duration value PICKUP_DUR, which indicates the
percentage ratio of the pickup situation and the set operation 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.
4.2.6.5
Timer characteristics
In the wattmetric IDMT mode, the
TRIP
output is activated based on the timer
characteristics:
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
417
Technical Manual
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