Overall Operation - Siemens siprotec 7SA6 User Manual

Introduction
1.1

Overall Operation

Analog Inputs
I
L1
I
L2
I
L3
I
4
U
L1
U
L2
U
L3
U
4
Control Panel
U
aux
Figure 1-1
1-2
The numerical Distance Protection SIPROTEC
Bit microprocessor. This provides fully numerical processing of all functions in the
device, from the acquisition of the measured values up to the output of commands to
the circuit breakers. Figure 1-1 shows the basic configuration of the device.
The measuring inputs MI transform the currents and voltages derived from the
instrument transformers and match them to the internal signal levels for processing in
the device. The device has 4 current and 4 voltage inputs. Three current inputs are
provided for measurement of the phase currents, a further measuring input (I
be configured to measure the earth current (residual current from the current
transformer star-point), the earth current of a parallel line (for parallel line
compensation) or the star-point current of a power transformer (for earth fault direction
determination).
MI IA
7 8 9
Operator
4 5 6
1 2 3
.
(6& (17(5
Binary Inputs (allocatable)
PS
Power Supply
Hardware structure of the numerical device 7SA6 (maximum configuration)
®
AD µC OA
∩
µC
#
0 +/-
7SA6 is equipped with a powerful 32
Error
Run
„Fault"
Output Relays
(allocatable)
LEDs
on the
Front Panel
(allocatable)
Display on
the Front Panel
Operating
Interface
Service
Interface
System
Interface
Time
Synchronization
Protection Data
Interface
C53000-G1176-C133-1
) may
4
to
PC
PC/
Modem
to
SCADA
e.g.
CF77
IRIG B
7SA6 Manual