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reset curve type "Def time reset", the reset time depends on the
Reset delay time
setting. With the reset curve type "Inverse reset", the reset time depends on the current
during the drop-off situation. The
START
output is deactivated when the reset timer
has elapsed.
The "Inverse reset" selection is only supported with ANSI or user
programmable types of the IDMT operating curves. If another
operating curve type is selected, an immediate reset occurs during the
drop-off situation.
The setting
Time multiplier
is used for scaling the IDMT operate and reset times.
The setting parameter
Minimum operate time
defines the minimum desired operate
time for IDMT. The setting is applicable only when the IDMT curves are used.
The
Minimum operate time
setting should be used with great care
because the operation time is according to the IDMT curve, but always
at least the value of the
Minimum operate time
setting. For more
IDMT curves for overcurrent protection
section
in this manual.
The timer calculates the start duration value START_DUR, which indicates the
percentage ratio of the start situation and the set operating 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.
4.1.1.5
Measurement modes
The function operates on four alternative measurement modes: "RMS", "DFT",
"Peak-to-Peak" and "P-to-P + backup". Additionally, there is “Wide P-to-P”
measurement mode in some products variants. The measurement mode is selected
with the setting
Measurement mode
.
Section 4
1MRS758755 A
Protection functions
204
REC615 and RER615
Technical Manual
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