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Blocking logic
There are three operation modes in the blocking functionality. The operation modes are
controlled by the
BLOCK
input and the global setting
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. 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.
4.5.6.5
Timer characteristics
24 supports both DT and IDMT characteristics. The DT timer characteristics can be
selected as "ANSI Def. Time" or "IEC Def. Time" in the
Operating curve type
setting. The
functionality is identical in both cases. When the DT characteristics are selected, the
functionality is only affected by the
Trip delay time
and
Reset delay time
settings.
24 also supports four overexcitation IDMT characteristic curves: "OvExt IDMT Crv1",
"OvExt IDMT Crv2", "OvExt IDMT Crv3" and "OvExt IDMT Crv4".
Overexcitation inverse definite minimum time curve (IDMT)
In the inverse time modes, the trip time depends on the momentary value of the excitation:
the higher the excitation level, the shorter the trip time. The trip time calculation or
integration starts immediately when the excitation level exceeds the set
Pickup value
and
the
PICKUP
output is activated.
The
TRIP
output is activated when the cumulative sum of the integrator calculating the
overexcitation situation exceeds the value set by the inverse time mode. The set value
depends on the selected curve type and the setting values used.
The
Minimum trip time
and
Maximum trip time
settings define the minimum trip time and
maximum trip time possible for the IDMT mode. For setting these parameters, a careful
study of the particular IDMT curves is recommended.
The tripping time of the function block can vary much between different
operating curve types even if other setting parameters for the curves were
not changed.
Once activated, the timer activates the
PICKUP
output for the IDMT curves. If the
excitation level drops below the
Pickup value
setting before the function trips, the reset
Section 4
1MAC059074-MB A
Protection functions
646
615 series ANSI
Technical Manual
Содержание Relion 615 series
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