Setting Notes - Siemens 7SK80 Manual

Functions
2.4 Dynamic Cold Load Pickup
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 protection functions. If not required, this function is set to Disabled. The
function can be turned ON or OFF under address 1701 Coldload Pickup.
Depending on the condition that initiates the cold load pickup function, address 1702 Start Condition is
set to either No Current or Breaker Contact. Breaker Contact can only be selected if the device re-
ceives information about the circuit breaker state via at least one binary input.
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 Time Overcurrent Protection, Phases (50/51)
The dynamic pickup values and time delays associated with non-directional time overcurrent protection are set
at address block 18 (50C.../51C...) for phase currents:
Address 1801 50c-2 PICKUP and 1802 50c-2 DELAY or 1808 50c-3 PICKUP and 1809 50c-3 DELAY
define the dynamic parameters for the high current elements, 1803 50c-1 PICKUP and 1804 50c-1 DELAY
for the 50 overcurrent element 1805 51c PICKUP together with 1806 51c TIME DIAL (for IEC curves) or
1807 51c TIME DIAL (or ANSI curves) for the 51 overcurrent element.
Non-directional Time Overcurrent Protection (50N, 51N), Ground
The dynamic pickup values and time delays associated with non-directional time overcurrent ground protection
are set at address block 19 (50NC.../51NC...):
Address 1901 50Nc-2 PICKUP and 1902 50Nc-2 DELAY or 1908 50Nc-3 PICKUP and 1909 50Nc-3
DELAY define the dynamic parameters for the high current elements, 1903 50Nc-1 PICKUP and 1904 50Nc-
1 DELAY for the 50N overcurrent element and 1905 51Nc PICKUP together with 1906 51Nc T-DIAL (for
IEC curves) or 1907 51Nc T-DIAL (for ANSI curves) for the 51N overcurrent element.
Directional Time Overcurrent Protection, Ground (67N, 67N-TOC)
The dynamic pickup values and time delays associated with directional overcurrent ground protection are set
at address block 21 (g67Nc.../67Nc-TOC...):
Address 2101 67Nc-2 PICKUP and 2102 67Nc-2 DELAY define the dynamic parameters for the 67-2 ele-
ment, 2103 67Nc-1 PICKUP and 2104 67Nc-1 DELAY for the 67-1 element and 2105 67Nc-TOC PICKUP
together with 2106 67Nc-TOC T-DIAL (for IEC curves) or 2107 67Nc-TOC T-DIAL (for ANSI curves) for
the 67-TOC element.
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SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012