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Section 4
1MAC050144-MB C
Protection functions
112
615 series ANSI
Technical Manual
The setting
Time multiplier
is used for scaling the IDMT trip and reset times.
The setting parameter
Minimum trip time
defines the minimum desired trip time for IDMT.
The setting is applicable only when the IDMT curves are used.
The timer calculates the pickup duration (PICKUP_DUR) value which indicates the
percentual ratio of the pickup situation and the set trip time. The value is available through
the Monitored data view.
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 relay 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
trip timer is frozen to the prevailing value. In the "Block all" mode, the whole function is
blocked and the timers are reset. the "Block TRIP output" mode, the function operates
normally but the
TRIP
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". The measurement mode is selected with the setting
Measurement mode
.
Table 87:
Measurement modes supported by 51P/50P stages
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
Minimum trip 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 information, see the
General function block features section in this manual
Measurement mode
Supported measurement modes
51P
50P-1/2
50P-3
RMS
x
x
DFT
x
x
Peak-to-Peak
x
x
P-to-P + backup
x
For a detailed description of the measurement modes, see the General
function block features section in this manual.
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