Siemens SIPROTEC 7SJ80 User Manual

[anschl-2-stromwdl-v-schaltung-060606, 1, en_US]
Figure C-8
Current transformer connections to two current transformers and as open-delta connection
the voltage transformer – for isolated or resonant-grounded networks when no directional
ground protection is needed
[anschl-3-stromwdl-sternp-v-schaltung-060606, 1, en_US]
Figure C-9
Current transformer connections to three current transformers, two voltage transformers in
open-deltaconnection, only for isolated or resonant-grounded networks; no directional ground
protection since displacement voltage cannot be calculated
Note: If the system has only 2 voltage transformers (open-delta connection), the device, too, should be
connected in open-delta connection and the unused voltage input should be short-circuited.
Connection Examples
C.1 Connection Examples for Current and Voltage Transformers
446 SIPROTEC 4, 7SJ80, Manual
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