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1MAC050144-MB C
Section 5
Protection related functions
615 series ANSI
411
Technical Manual
Figure 209:
Functional module diagram
5.6.4.1
Level detector
The level detector compares AI_VALUE to the
Pickup Value
setting. The
Operation mode
setting defines the direction of the level detector..
Table 362: Operation mode types
The Absolute hysteresis setting can be used for preventing unnecessary oscillations if the
input signal is slightly above or below the
Pickup Value
setting. After leaving the
hysteresis area, the start condition has to be fulfilled again and it is not sufficient for the
signal to only return to the hysteresis area. If the ENA_ADD input is activated, the
threshold value of the internal comparator is the sum of the
Pickup Value Add
and
Pickup
Value
settings. The resulting threshold value for the comparator can be increased or
decreased depending on the sign and value of the
Pickup Value Add
setting.
5.6.4.2
Timer
Once activated, the timer activates the PICKUP output. The time characteristic is
according to DT. When the operation timer has reached the value set by
Trip delay time
,
the TRIP output is activated. If the pickup condition disappears before the module trips,
the reset timer is activated. If the reset timer reaches the value set by Reset delay time, the
operation timer resets and the PICKUP output is deactivated.
The timer calculates the pickup duration value PICKUP_DUR, which indicates the ratio
of the pickup situation and the set trip time. The value is available in the monitored data
view.
5.6.4.3
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 IED program. The
AI_VALUE
Level
Detector
ENA_ADD
BLOCK
Blocking
logic
TRIP
PICKUP
t
Timer
Operation mode
Description
"Under"
If the input signal AI_VALUE is lower than the set value of the
Pickup Value
setting, the
level detector enables the timer module
"Over"
If the input signal AI_VALUE exceeds the set value of the
Pickup Value
setting, the level
detector enables the timer module.
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
Page 2: ......
Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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