ABB REG316 4 Series - Page 631

Numerical generator protection
ABB Switzerland Ltd
Utility Automation
REG316*4
1MRK502004-Ben
Page 3
ratio between its mean time in service with-
out failure and the total life, is most certainly
the most important characteristic required of
protection equipment. As a consequence of
the continuous supervision of its functions,
this quotient in the case of REG316*4 is typi-
cally always close to 1.
The menu-based HMI (human machine inter-
face) and the REG316*4 small size makes the
tasks of connection, configuration and setting
simple. A maximum of FLEXIBILITY, i.e.
the ability to adapt the protection for applica-
tion in a particular power system or to coordi-
nate with, or replace units in an existing pro-
tection scheme, is provided in REG316*4 by
ancillary software functions and the assign-
ment of input and output signals via the HMI.
REG316*4’s RELIABILITY, SELECTIV-
ITY and STABILITY are backed by decades
of experience in the protection of generators
and motors in transmission and distribution
systems. Numerical processing ensures con-
sistent ACCURACY and SENSITIVITY
throughout its operational life.
Hardware The hardware concept for the REG316*4
generator protection equipment comprises
four different plug-in units, a connecting
mother PCB and housing (Fig. 1):
• analog input unit
• central processing unit
• 1 to 4 binary input/output units
• power supply unit
• connecting mother PCB
• housing with connection terminals
In the analog input unit an input transformer
provides the electrical and static isolation
between the analogue input variables and the
internal electronic circuits and adjusts the sig-
nals to a suitable level for processing. The
input transformer unit can accommodate a
maximum of nine input transformers (volt-
age-, protection current- or measuring
transformer).
Every analog variable is passed through a
first order R/C low-pass filter on the main
CPU unit to eliminate what is referred to as
the aliasing effect and to suppress HF inter-
ferences (Fig. 2). They are then sampled 12
times per period and converted to digital sig-
nals. The analog/digital conversion is per-
formed by a 16 Bit converter. A DSP carries
out part of the digital filtering and makes sure
that the data for the protection algorithms are
available in the memory to the main proces-
sor.
Fig. 1 Hardware platform overview
HMI
Trip
Outputs
Sign.
Outputs
Bin.
Inputs
Remote I/O
P
C
M
C
I
A
a
b
c
d
DC
DC
+5V
+15V
-15V
+24V
Power
supply
A/D
DSP
CPU
486
Serial
controller
RS
232
FLASH
EPROM
Tranceiver
RAM
SW-Key
PCC
LON
MVB
SPA / IEC870-5-103
LED's
SCS
SMS
Serial
controller
RS
232
DPM
Trip
Outputs
Sign.
Outputs
Bin.
Inputs
I / O
Ports
PCC
MVB
Process bus
Trip
Outputs
Sign.
Outputs
Bin.
Inputs
Remote I/O
Trip
outputs
Signal
outputs
Binary
inputs
Remote I/O
Trip
Outputs
Sign.
Outputs
Bin.
Inputs
I / O
Ports
Trip
Outputs
Sign.
Outputs
Bin.
Inputs
I / O
Ports
Trip
outputs
Signal
outputs
Binary
inputs
I / O
Ports
(MVB)