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4.4.4.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
The operation of NSPTOV can be described using a module diagram. All the modules
in the diagram are explained in the next sections.
GUID-0014077D-EEA8-4781-AAC7-AFDBAAF415F4 V1 EN
Figure 219:
Functional module diagram
Level detector
The calculated negative-sequence voltage is compared to the set
Start value
setting. If
the value exceeds the set
Start value
, the level detector enables the timer.
Timer
Once activated, the timer activates the
START
output. The time characteristic is
according to DT. When the operation timer has reached the value set by
Operate delay
time
, the
OPERATE
output is activated if the overvoltage condition persists. If the
negative-sequence voltage normalizes before the module operates, the reset timer is
activated. If the reset timer reaches the value set by
Reset delay time
, the operate timer
resets and the
START
output is deactivated.
The timer calculates the start duration value START_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
OPERATE
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 OPERATE output" mode, the function
operates normally but the
OPERATE
output is not activated.
1MRS758755 A
Section 4
Protection functions
REC615 and RER615
427
Technical Manual
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