voltage pickup value of 1.0 × Vn corresponds to 1.0 × 11.547 kV = 11.547 kV in the
primary.
Example 2:
V0 is calculated from the phase quantities. The phase VT-ratio is 20/sqrt(3)
kV : 100/sqrt(3) V. In this case, "Calculated V0" is selected. The nominal value for
residual voltage is obtained from the VT ratios entered in Residual voltage V0:
Configuration/Analog inputs/Voltage (3V,VT)
: 20.000kV : 100V. The residual voltage
pickup value of 1.0 × Vn corresponds to 1.0 × 20.000 kV = 20.000 kV in the primary.
If "Calculated V0" is selected, the nominal value of residual voltage is
always phase-to-phase voltage. Thus, the valid maximum setting for
residual voltage
Pickup value
is 0.577 × Vn. The calculated V0 requires
that all three phase-to-ground voltages are connected to the protection
relay. V0 cannot be calculated from the phase-to-phase voltages.
Timer
Once activated, the timer activates the
PICKUP
output. The time characteristic is
according to DT. When the operation timer has reached the value set by
Trip delay time
,
the
TRIP
output is activated. If the fault disappears before the module trips, the reset timer
is activated. If the reset timer reaches the value set by
Reset delay time
, 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 start 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.
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
629
Technical Manual
Summary of Contents for Relion 615 series
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