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Metering and Extended Protective Relaying
Reverse Power
-
Reverse Power
is
a
protective
relaying
iunction that protects
against
an
excessive reverse
power
condition. Tripplng
o""rit
when
the
reverse
power exceeds
tf',u
p.gturred
ieverse
power pickup
fo1
a-geriod of
time
enr:al
to
the delav time setting. The
pickup
must remain active
f-o]lhe entlre delay time
for
a
trip
to
occur'
lf
the reverse power
"".iHi".
trOilOes
in tess
time than the delay time' the
pickup
;ill
;;"i.;;ilve
ano
the
reverse
power protective
relaving
function
will be
reset.
when a
tripping occurs,
the
actual
"lndit,on
that caused the
trip is
recorded in the
trip
unit's
nonvolatile triP
log.
Programmable settings:
frip:
Yes, No
or
Clr
eiJf.up,
tO
to
zZOO
[ilowatts
(kW) in increments
of
1 kW
D;iri,
1
to
15
seconds
in increments
of
1
second
For convenience,
the pickup
value is entered
as
a
positive
,rir",
pi"rrp
occurs ii the measured power
is
negative
and
in! #toiuiu'ralue
of
the
measured
power
is
greater than the
pickup
setting.
Data
recorded
in
the
event
log:
"-pl"[rp
A"t'""
Time
at
i'f i"f'
pi"k'p.went
active
and
measured
Power at PickuP'
Pickup
lnactive:
Time
at
which pickup went
inactive'
Trip Log
-
The last 3
tripping
9v9lts
are
recorded
in
the
trip
,nlis-n#roratile
trip log,
tnctioed
in
the
recording
are the
time
of the trip lyear morittr day,
hour,
mhute
second'
and
r-rrnOi"Jtfi.
of seconds), the condition of the circuit
breaker
i";";. ;H";
oituitrt"j
allthe
basic
ard
extended pickups
which were active
at
tneiime
o{
the
trip
the
condition
of
the
trip
,rii;.
p.t""tlon
microprocessor
(Piss/Faill, and
the
actual
;;;i;"ir;i;"iion
tortil,
"xtended,
or
shadow) which
caused
iho
trin
A "failure"
"onOiiion
is
recorded
if
the
circuit
breaker
l".iii5"'i"
.Jt t"n.Lo
to qo open within
a set
time limit after
a
[e ;#;;;lt
itir"J i.
uooition
the relevant
measured
pJrrr"t"tt
,ithe
time
of
the
trip
are
also stored
in
the
trip
log'
The
measured currents
at time
of trip
are calculated
over
approximately
on"
"y"i"
at
the
time
a
trip command
is
actually
iliiLt"o.
fr.r"
magnitude
oithe
measured
currentwill
be
limited
Ly*iriutlon
of
tire current sensors above about fifteen times
,it"J
pi-rrv
current,
Out
should
still
provide
an
indication
of
which
phases
*"r"
,nuliutd
even for a maior short
circuit
All
of
the
trio
loo
information
may
Oe
reaO
by
a
master
device'
such
;!'
; p;;;;
Hrtonitor" panel uia
the
RS-485.
bus
The
most
L""nt
tiip
event data, without
the
time-stamp information may
U"
i"ua
io"ully with the
Breaker Display Unit (see
Breaker
D;.p;ry
ul.,]t
Je"iionl.
Note that time stamped
information
requires
a
master device
to
periodically synchronize
all
device
"f
,r-"[t
on
the
RS-485
network
While
iime-stamp
information
i;&;G
stored
in
the
trip
log,
it
should
o,nly
be
relied.on
when a master is used to
contiiuously
monitor
the
network'
Alarm Functions
?h;;';t;;loJs
oitterent
alarm
functions available with
atrip
,.t, iJpl"iing
,pon
the model
type
The
basic communicat-
,g'iilpGiil sLiii
rtip ittc.
ptoui'o"s
2
.or
3
alarm
f
unctions
depending on presence of the ground fault
protective func-
tio,l
Le
YP"
o'ption
pr.o,iO"t
1l
additional alarm
functions
and
the
"N" option
ptoulO"t
1
more
Each
alarm
function
is
I.Jt'pi"giu.lruor"
toi
mooe
ot
operatLon'
alarm
threshold
value,
and
delaY
time.
There are
two
user-selectable operating modes
associated
*iii
"*h
aiaim
function
The
first
sets
the
alarm
function
on
"i'"tf.l"
il.l"
"ff
mode,
alarm
threshold
and
time
delay values
Ir"
O"
t"i
trt
no
action will
be
taken'
This
effectively
disables
;# ;,;,6;r;"
"rut,
function ln the
on
mode' the
alarm
i;;"ffi
is
enabted
unJ
uiut*
activity
associated
with
the
r"tp!"it"
atar.m
trn"tion-*itt
o"
recorded in,the trip
unit's
event log.
Both
alarm
,Ltiu'tion
and deactivation are
stored
i.
ir',"
Li".t
log.
An
alarm becomes
active
when the
pro-
;;;;;J;ir,nitr,,"tr,Jo
value has been exceeded for
the
X":",it;;;.I;"
il;;,
when
an alarm goes
active'
the
time'
uiu"r*
i*"tion
and
associated measured
parameters
are
il,ili""
l"t"
in"
trip
unit'iLvLnt
log'
An
alarm becomes inactive
*H""
il-t"
measlreO parametei
no
longer meets
the
pro-
;;#;;;
,iui,
t-ntL.noto
vatue when
an-alarm
soes inactive'
the
time and assoclateO
'f
ui'
function
are
written
into the
trip
unit's event
log.
The
second
user-selectable
operating
mode sets
relay
output
;;;t,,;i;;;
oi
no.
seL"iiing
ves will
close
the
relav output
contacts when
the
r.t*i't"i
utarm
function becomes actlve
il; ;i;;
function that causes
the
relay output contacts
to
"io-.Jwri
o"loentif
ied as
piriot
its
event
log
message,
and
will
also
be recorded
in
il-,6'1iip
unit's alarm
log
along wlth
the
lt*"rt"o
,easured
pltutii"i"tt
The
alarm log
is
a
subset of
th;;;";i ts
speciticitv
tor
the purpose
of allowing the
BDU
;";;;;y
6
dlsptav
wiat
alarm function caused
the
most
recent relay output
contact
closure
The relay output
contacts
will
open
when
the
measuteO parameter no
longer
rneets the
".""ir*.n"a
utarm
tt,i"ir,old
value.
lf
multiple alarm func-
il;: il; ;;;"ii;
"onir.or
relav
output'
the
contacts
will
nnenwhenallfunctionssetforrelaycontrolnolongermeet
;#"i'
od;;;;i;;;
thiesholds rhe
alarm runction
which
iffit
Srroir"
the
relay
ouip't
contacts
to
open
will
also
be
i;;;ffi;J;;
prtt ot rti
event
los message
operation.
of
il
"
t"iuy
output
conta"1,
"'n
als5 oe done
remotely
using
Filarameter" Stored in TriP Log
la, lb, lc, and
if
option
Present
-
ln'
lg
ta,
lO,
tc,
and
if
oPtion Present
-
ln'
lg
ta,
f
O,
tc, lg, and
if
option
present
-
In
la. lb, lc, and
if
option
present
-
In'
lg
Vab, Vbc,
Vca'
and
V)tx
Vab,
Vbc,
Vca,
and
V*)K
Vab,
Vbc,
Vca, and
V)K;k
Over Voltage
Under Voltage
Voltage Unbalance
Hz.Vab,
Vbc, Vca, and
Vxx
Hz, Vab, Vbc, Vca, and
V*x
kW, KQ,
and
kVA
la, lb,
lc,
and
if
oPtion Present
-
ln'
lg
24
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