Functions
2.4 Dynamic Cold Load Pickup
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
125
2.4.2 Setting Notes
General
The dynamic cold load pickup function can only be enabled if address 117 Coldload Pickup was set to
Enabled during configuration of the protective functions. If not required, this function should be set to
Disabled. The function can be turned ON or OFF under address 1701 Coldload Pickup.
Depending on the condition that should initiate the cold load pickup function address 1702 Start Condition
is set to either No Current, Breaker Contact or to 79 ready. Naturally, the option Breaker Contact
can only be selected if the device receives information regarding the switching state of the circuit breaker via
at least one binary input. The option 79 ready modifies dynamically the pickup thresholds of the directional
and non-directional time overcurrent protection when the automatic reclosing feature 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 auto-reclosure is available, activated, unblocked 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).
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 50/51 Elements (phases)
The dynamic pickup values and tripping times associated with the time overcurrent protection functions are set
at address block 18 for the phase currents:
The dynamic pickup and delay settings for the high-set elements are set at addresses 1801 50c-2 PICKUP
or 1808 50c-3 PICKUP and 1802 50c-2 DELAY or 1809 50c-3 DELAY respectively; the dynamic pickup
and delay settings for the 67N-1 element are set at addresses 1803 50c-1 PICKUP and 1804 50c-1 DELAY
respectively; and the pickup, time multiplier (for IEC curves or user-defined curves), and time dial (for ANSI
curves) settings for the 67N-TOC element are set at addresses 1805 51c PICKUP, 1806
51c TIME DIAL
an
d 1807 51c TIME DIAL respectively.
Non-Directional 50N/51N Elements (ground)
The dynamic pickup values and time delays associated with non-directional time overcurrent ground protection
are set at address block 19:
The dynamic pickup and delay settings for the high-set elements are set at addresses 1901 50Nc-2 PICKUP
or 1908 50Nc-3 PICKUP and 1902 50Nc-2 DELAY or 1909 50Nc-3 DELAY respectively; the dynamic
pickup and delay settings for the 67N-1 element are set at addresses 1903 50Nc-1 PICKUP and 1904 50Nc-
1 DELAY respectively; and the pickup, time multiplier (for IEC curves or user-defined curves), and time dial (for
ANSI curves) settings for the 67N-TOC element are set at addresses 1905 51Nc PICKUP, 1906 51Nc T-
DIAL and 1907 51Nc T-DIAL respectively.
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