function is ready. To initiate the cold load pickup, the automatic reclosing function provides the internal signal
"79M Auto Reclosing ready". It is always active when automatic reclosing is available, activated, not blocked
and ready for a further cycle (see also margin heading "Controlling Directional/Non-Directional Overcurrent
Protection Elements via Cold Load Pickup" in Section 2.14.6 Setting Notes).
Time Delays
There are no specific procedures on how to set the time delays at addresses 1703 CB Open Time, 1704
Active Time and 1705 Stop Time. These time delays must be based on the specific loading characteristics
of the equipment being protected, and should be set to allow for brief overloads associated with dynamic cold
load conditions.
Non-directional Overcurrent Protection, Phases
The dynamic pickup thresholds for the phase currents of the overcurrent protection are set at the following
addresses:
50c-1 PICKUP
Address 1803
50c-2 PICKUP
Address 1801
50c-3 PICKUP
Address 1808
51c PICKUP
Address 1805
51c-1 PICKUP
Address 1814
The trip times for the phase currents of the overcurrent protection are set at the following addresses:
50c-1 DELAY
Address 1804
50c-2 DELAY
Address 1802
50c-3 DELAY
Address 1809
51c TIME DIAL
Address 1806 for IEC and user-defined characteristics
51c TIME DIAL
Address 1806 for recloser characteristics. The parameter must cover an extended
setting range by the bandwidth of the recloser characteristic
51c TIME DIAL
Address 1807 for ANSI characteristic
51c-1 TIME DIAL
Address 1815 for setting value all curves
The characteristics for the phase currents of the overcurrent protection and their possible settings are entered
at addresses:
1811
51c IEC Curve Normal Inverse, Very Inverse, Extremely Inv., Long
Inverse
1812 51c ANSI Curve Very Inverse, Inverse, Short Inverse, Long Inverse,
Moderately Inv., Extremely Inv., Definite Inv.
1813 51c Recloser Curve A (101), Curve B (117), Curve C (133), Curve D
(116), Curve E (132), Curve K (162), Curve N (104), Curve
R (105), Curve W (138), Curve 2 (135), Curve 3 (140),
Curve 8 (113), Curve 8* (111), Curve 9 (131), Curve 11
(141)
1817 51c-1 IEC Cur. Normal Inverse, Very Inverse, Extremely Inv., Long
Inverse
1819 51c-1 ANSI Cur. Very Inverse, Inverse, Short Inverse, Long Inverse,
Moderately Inv., Extremely Inv., Definite Inv.
1820 51c-1 Rec. Cur. Curve A (101), Curve B (117), Curve C (133), Curve D
(116), Curve E (132), Curve K (162), Curve N (104), Curve
R (105), Curve W (138), Curve 2 (135), Curve 3 (140),
Curve 8 (113), Curve 8* (111), Curve 9 (131), Curve 11
(141)
At address 1810 51c Drop-out or 1816 51c-1 Drop-out, you can set the dropout behavior Disk
Emulation or Instantaneous for the phase currents of the overcurrent protection.
Functions
2.4 Dynamic Cold Load Pickup
154 SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
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