Siemens SIPROTEC 7SJ62 Instruction Manual

Introduction
1-2 7SJ62 Manual
C53000-G1140-C121-1
1.1 Overall Operation
The SIPROTEC
®
4 7SJ62 is a numerical, multi-functional, protective and control de-
vice equipped with a powerful microprocessor. All tasks, such as the acquisition of the
measured quantities, issuing of commands to circuit breakers and other primary pow-
er system equipment, are processed in a completely digital way. Figure 1-1 illustrates
the basic structure of the 7SJ62.
Analog Inputs The measuring inputs (MI) section consists of current and voltage transformers. They
convert the signals from the measuring transducers to levels appropriate for the inter-
nal processing of the 7SJ62.
Four current inputs are available in the MI section. Three inputs are used for measur-
ing of the phase currents. The use of the fourth input depends on the version of the
device ordered. The fourth input can be used for measuring the ground current as the
residual of the phase current transformers (In), or for measuring the ground current
from a separate current transformer (I
Ns
/3I
0
). The latter is used in a highly sensitive
ground fault protective scheme (I
Ns
) or as a polarizing 3I
0
current to determine the fault
direction.
µC
A
D
ERROR
RUN
Output
Relays, User-
Programmable
LEDs
on the Front
Panel, User-
Programmable
Display on
the Front Panel
Front
PC Port
To
PC
System
Serial Interface
To
SCADA
Ia
Ib
Ic
In / I
Ns
Va
Vb
Vc / 3V
0
789
456
123
.
0+/-
(6& (17(5
Operator
Control Panel
U
aux.
Binary Inputs,
Power Supply
Rear
Service Port
MI IA AD µC AV
Figure 1-1 Hardware Structure of the Numerical Device 7SJ62 (Maximum Configuration)
Status
PC/
Modem
Programmable
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Siemens SIPROTEC 7SJ62 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SJ62
Category	Relays
Language	English