Siemens SIPROTEC 4 7SJ61 User Manual

initiate the cold load pickup, the automatic reclosing function provides the internal signal "79M Auto
Reclosing ready". It is always active when the automatic reclosing function 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 2.11.6 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.
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
and 1807 51c TIME DIAL respectively.
50N/51N Elements (ground)
The dynamic pickup values and time delays associated with non-directional time overcurrent ground protec-
tion 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.
Settings
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding secon-
dary nominal current of the current transformer.
Addr.
Parameter C Setting Options Default Setting Comments
1701 COLDLOAD PICKUP OFF
ON
OFF Cold-Load-Pickup Function
1702 Start Condition No Current
Breaker Contact
79 ready
No Current Start Condition
1703 CB Open Time 0 .. 21600 sec 3600 sec Circuit Breaker OPEN Time
1704 Active Time 1 .. 21600 sec 3600 sec Active Time
1705 Stop Time 1 .. 600 sec; ∞ 600 sec Stop Time
1801 50c-2 PICKUP 1A 0.10 .. 35.00 A; ∞ 10.00 A 50c-2 Pickup
5A 0.50 .. 175.00 A; ∞ 50.00 A
1802 50c-2 DELAY 0.00 .. 60.00 sec; ∞ 0.00 sec 50c-2 Time Delay
1803 50c-1 PICKUP 1A 0.10 .. 35.00 A; ∞ 2.00 A 50c-1 Pickup
5A 0.50 .. 175.00 A; ∞ 10.00 A
1804 50c-1 DELAY 0.00 .. 60.00 sec; ∞ 0.30 sec 50c-1 Time Delay
2.3.3
Functions
2.3 Dynamic Cold Load Pickup
SIPROTEC 4, 7SJ61, Manual 75
C53000-G1140-C210-6, Edition 05.2016

Siemens SIPROTEC 4 7SJ61 Specifications

General

Brand	Siemens
Model	SIPROTEC 4 7SJ61
Category	Relays
Language	English