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Metering and Extended Protective Relaying
Power Factor Scale
UnltY
Leadng -0.01
'002 003
-098
-099
+l
00,
+099
+098
'+003
+002'
+001
Lagqng
Power Factor alarm
characterlstics:
Alarm
pickuP-1
range:
-.01
-
+
01
Alarm
pickuP
-2
range.
-
01
-
+.01
Recalibration and ReProgramming
tiporti.g piogtu,
"od"-in
the trip
unit's metering
board
norruf
fi*if
f
n"ot
require recalibration
of
metering
functions
io*"u,it
in
the
unlikely event that
the
metering
board
micro-
orocessor should
have
to be replaced, the
trip
unit must
be
I"trrn"o i" il
e
factory for recalibration and
reprogramming
of
tf,"
."t"ting
proteciive relaying, and
alarm
functions to
the
factory default
settings
Calibration
of the
trip
unit's metering functions can be done
at
the
customer's
site
if
the customer
has
the proper
equipment'
irll
"quip."nt
requirements are a
3-phase current
and volt-
ug"
.orr""
accurate
lo
114%
or better
with
output
ranges
of
o"zioo
o.sooO,
and
1.000
amps and
300
volts' The
phase
ang-f
eLetween
each current and
voltage
must be
adjustable'
N"Z"..uty
delays are
0o,
90o,
and
-90'
C-onsult
a
Siemens
r""tgy;,{O
Automation,
lnc
sales office
or
field service office
for more informatlon.
Password
Protection
Data
can be
read
by
anyone
using
the
remote
communl-
"utiona
port with a
master'device such
as
the
Power Monitor
pun"f
-.ji
,.ing
the local
communicatrons
port with
a
BDU
device
Changing
the
configuration such
as
current
sensor
rating
alarm
i'imils,
extended protective.relaying
set-points'
or
tri-p
unit address
can be
done only after entering a
user-
O"iinLJ
pr..word,
Passwords
are
stored
in
the master
device
G-;
F;;;i
MonitorrM
panel) and
in
the
trip
unit
for the
BDU
display
accessory.
Remote
Monitoring
and Programming
The
communications
port
on
the
back
of the
trip
unit
provides
un
inoritty
ttandard
ifS-+gs
interface for remote monitor and
"onttof
equipment
The remote
equipnent
mqV
be a
Power
Vonitor" panel
personal
computer
(PC),
or LAD
display
unit
inlfl"-Si"*"ns
A'CCESS"
system,
The
Power
MonitorrM
unit
is a
microprocessor-controlied
display and
monitoring
de-
ui""
tf,ut
provides real-time
data display, discrete
input
status
Oisptay,
event logging, and programming of field
de-
ui"""*t.rrcf", Irovide
cirCuit
piotection and protective
relaying
for
industrial
AC power systems. For
detailed
information see
tfre power
MonitorTM
lnsiruction
and
Operation
Guide'
SG-
+Of
A
ff,"
ACCESSTM
electrlcal distribution communications
ry.t",
provides
the capability'to
monitor
and
manage
the
"iiii"
po*"t
distribution networks of energy-intensive facili-
ties. lniormation
on the
ACCESST''r
system
ts
contained
in
the
ACCESSTT/
Bulletin,
SG
3099.
Local
Monitoring
and
Programming
[ocat
monitoring-and progiammlng can
Qe
done with a
por-
table
PC or
with a Breaker Display Unit
(BDU)
The communt-
tution.-pott
on
the back of the
tiip
unit provldes access
for
G
-poriaOfe
PC.
The
lsolated
Multi-DroprM
converter
by
6i"run.
may
be
used
to provide
an RS-485
to
RS-232 inter-
face
for
the
PC.
The BDU is a simple and convenient device for reading
the
melereO
data
and
trip
unit log. The BDU
can
also
be
used to
iet
the
configuration parameiers and
set-points
of
the alarms
and extended protective
relaying functions
Delay time:
Min, model
type
req.:
Measured
Parameter:
1-255
sec
CP
PF
The Power Factor
alarm has 2 pickup values, each of
which
can be programmed
to
any
point along the
scale
The Power
Factor
alaril
will go
activewhen
the measured
power
Iactor
(eF)
falls outside
oJ
the
pickup
points
set
along
the
scale
for
the
programmed
delay time.
The
following
examples
illustrate
'pi"firp
settings and corresponding alarm regions along
the
power
factor
scale.
Example
1
eacl
no
-0
01
0
02
-O
03.
O.9B
O
99
+1
00,
+O'99 +0
98
-O
03
+O
02
+0'01
Lagg
ng
-'* :;;;;,
I
H:#i'.
I
Ararm*esion
PckuP
1
Pckup-2
Example
2
Lead
ng
'0
Ol
0
02
O
03
.
0
98
0.99
+T
'00
+0'99
+O
98
+0
03
+0
02
+0-01
Lagg
ng
ardrr
Bes
o-
I
):"^":
I
Alarn
qeoion
Pckup
1
Pckup-2
Example
3
Leadng
-'O0l
-0.02
-003..-098
-0.99 +1'00.
+099
+098
+003'
+002
+0'01
Lagqng
Ard'^
FFq
on
I
I:"^"t;" |
'o
a'r
ceoo-
a
, a
pc
o-2
Note that
the
Power Factor alarm
is disabled
if
l>k
is
below
15"k
or
above
1257o
of
sensor rating or
V**
is
below
l5%
of
V
SCALE
Event Log
-
The event
log
uses active
memory
with
the
capacity
td nominally record the
10
most recent alarm events'
tf
dny
oi
the preceding alarms go active, the time the
alarm
weniactive,
the
namsof
the
alarm
function, and the
values
of
the
measured parameters associated with
the
alarm
are
wrltten
into
the event log. lf
an
alarm causes the alarm
relay
to close, an
additional
event
is
written
signifying
that the relay
has closed and indicating which alarm caused the
closure'
When an
active alarm goes inactive,
the name
of
the alarm
and
the time
that the
alarm
went inactive
is
written
into
the
log'
lf
the alarm
going inactive
results
in
a
closed
alarm relay being
opened
a"n
aO"ditionat
event
is
written indicating which
alarm
caused the
relay
to open
and the
time
it
was
opened
Upon request the event log information
is sent to
the
master
device
such
as a
Power
MonitorrM
panel, via the RS-485 bus'
The event log
is not
accessible
with the BDU Breaker Display
Unit, (see
Alarm Log
below).
Alarm Log
-
A
separate alarm log
is
mqntained
by the
trip unit
foruse
UyIne aOU display accessory.
This log
records
the last
action which caused
the
alarm
relay to
close' This includes the
15
alarm
f
unction actions plus
remote
closing
or
opening
of
the
alarm
relay via
a
command
f
rom
a
master device using the
RS-
485 bus.
zo
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