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Pickup- and Dropout Values
At addresses 5521, 5541, 5561 and 5581 you configure the start frequency LZx Start for the elements. The
start frequency must be adjusted to a value equal or higher than the tripping frequency of the underfrequency
element.
At addresses 5523, 5543, 5563 and 5583 configure the pickup frequency LRx Pickup for the elements. The
pickup frequency and the start frequency add up to the pickup threshold of the load restoration element.
At addresses 5524, 5544, 5564 and 5584 you configure the delay time LRx t pickup for the pickup of
elements.
At addresses 5525, 5545, 5565 and 5585 you configure the dropout frequency LRx Dropout the elements.
The dropout frequency and the start frequency add up to the dropout threshold of the load restoration
element.
At addresses 5526, 5546, 5566 and 5586 you may configure the dropout time LRx t dropout for the
elements.
At addresses 5527, 5547, 5567 and 5587 you may configure the close command duration of the circuit
breaker LRx t CB Close.
The following example illustrates the interaction of the pickup- and dropout values of the load restoration
elements and underfrequency elements.
The pickup threshold of the underfrequency elements 81-1, 81-2 and 81-3 are set to the following frequen-
cies:
81-1 PICKUP 5403 = 49,5 Hz
81-2 PICKUP 5406 = 49 Hz
81-3 PICKUP 5409 = 47,5 Hz
Table 2-3
Parameter
LZ1
Start
LR1 Start 5521 = 49,5 Hz
Pickup
LR1 Pickup 5523 = 0,25 Hz
Dropout
LR1 Dropout 5525 = 0 Hz
Pickup Time
LR1 t pickup 5524 = 14 s
Dropout Time
LR1 t dropout 5526 = 10 s LR2 t dropout 5546 = 10 s LR3 t dropout 5566 = 10 s
CB Close time
LR1 t CB Close 5527 = 1 s LR2 t CB Close 5547 = 1 s LR3 t CB Close 5567 = 1s
Underfrequency
LR1 after 81-1 5528 =
elements
YES
LR1 after 81-2 5529 =
YES
LR1 after 81-3 5530 =
YES
LR1 after 81-4 5531 =
YES
SIPROTEC 4, 7RW80, Manual
C53000-G1140-C233-4, Edition 07.2018
Settings Example
LZ2
LR2 Start 5541 = 49 Hz
LR2 Pickup 5543 = 0,50 Hz
LR2 Dropout 5545 = 0,25 Hz LR3 Dropout 5565 = 0,25 Hz
LR2 t pickup 5544 = 13 s
LR2 after 81-1 5548 = NO
LR2 after 81-2 5549 =
YES
LR2 after 81-3 5550 =
YES
LR2 after 81-4 5551 =
YES
Functions
2.4 Load Restoration
LZ3
LR3 Start 5561 = 49 Hz
LR3 Pickup 5563 = 0,50 Hz
LR3 t pickup 5564 = 7 s
LR3 after 81-1 5568 = NO
LR3 after 81-2 5569 =
YES
LR3 after 81-3 5570 =
YES
LR3 after 81-4 5571 =
YES
55
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