TRIP
Level
detector
I_A
I_B
I_C
TIMER
t
BLOCK
Blocking
logic
GUID-93025A7F-12BE-4ACD-8BD3-C144CB73F65A-ANSI V2 EN
Figure 136:
Functional module diagram
Level detector
The measured phase currents are compared to the set
Pickup value
. The TRMS values of
the phase currents are considered for the level detection. The timer module is enabled if
at least two of the measured phase currents exceed the set
Pickup value
.
Timer
Once activated, the internal
PICKUP
signal is activated. The value is available only
through the Monitored data view. The time characteristic is according to DT. When the
operation timer has reached the
Trip delay time
value, the
TRIP
output is activated.
When the timer has elapsed but the motor stall condition still exists, the
TRIP
output
remains active until the phase currents values drop below the
Pickup value
, that is, until
the stall condition persists. If the drop-off situation occurs while the trip time is still
counting, the reset timer is activated. If the drop-off time exceeds the set
Reset delay time
,
the operation timer is reset.
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
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.
Section 4
1MAC059074-MB A
Protection functions
286
615 series ANSI
Technical Manual
Summary of Contents for Relion 615 series
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