Siemens SIPROTEC 7SJ80 User Manual

If the binary input >BLOCK CLP is enabled, all triggered timers are reset and, as a consequence, all "normal"
settings are immediately restored. If blocking occurs during an on-going fault with dynamic cold load pickup
functions enabled, the timers of all overcurrent relay elements are stopped and may then be restarted based
on their "normal" duration.
During power up of the protective relay with an open circuit breaker, the time delay CB Open Time is
started, and is processed using the "normal" settings. Therefore, when the circuit breaker is closed, the
"normal" settings are effective.
The following figures show the timing sequenceand the logic diagram of the dynamic cold load pickup
feature.
[zeitablaeufe-der-dynamischen-parameterumschaltung-260602-kn, 1, en_US]
Figure 2-34
Timing charts of the dynamic cold load pickup function
Functions
2.4 Dynamic Cold Load Pickup
SIPROTEC 4, 7SJ80, Manual 107
E50417-G1140-C343-A8, Edition 12.2017

Siemens SIPROTEC 7SJ80 Specifications

General

Rated Frequency	50/60 Hz
Rated Current	1 A / 5 A
Operating Temperature	-25°C to +55°C
Storage Temperature	-40°C to +70°C
Current Transformer Inputs	4
Application	Protection of feeders, motors, transformers, and generators
Rated Voltage	100-240 V AC/DC
Communication Protocols	IEC 61850, Modbus, DNP3, IEC 60870-5-103
Display	Graphical LCD
Mounting	Flush mounting
Protection Functions	Overcurrent, Earth fault
Communication Interfaces	Ethernet, RS485
Housing	Plastic
Weight	Approx. 1.5 kg