Siemens Static Trip III User Manual

Zone
lnterlocking
Zone
lnterlocking
7on"
int"tfo"kingicapability
is
provided
as
standard
on
trip
units
with
short
time
or
ground fault
protection,
but
additional
""*p""""t.
and
wirin!
are
required
to
connect
trip
units
tog"ih"t
into
a
functioning
zone-interlocked
system'
Zone
selective
interlocking
of
series
connected
circuit
break-
eI
proviOes tor
a closer
cdordination
of short
time
and
ground
fauli
protection
in a
power distribution
network
When
a
zone
inieirircr
type
fault
current
is
detected,
the
trip
units
send
a
;i";k;g
slgnal
notifying
the
upstream
ci,rcuit
breakers
that
the
irr[
i."o"i.g
cteareo"at
a
lower
level
lf
a circuit
breaker
experiencing"the
fault
receives
a blocking
signal'
it executes
if.l,I6rft
prot"ection function
based
on
the
programmed
short
iinlu
oi
ground fault
time
delay
band
lf it
does
not receive
a
nfoLf.,nd
signal,
it executes
the
fault
protection
function
based
dn
th"e
minimum
delay
band
This
coordinated
proce-
Ori"
p."iO"s for
a
high
level
of
fault
protection
to
the
bus
structure
between
the
zones.
If,
for
some
reason,
the
fault
current
is
not
cleared
by
the
i,iooino
of
the
lowest
level
circuit
breaker
experiencing
the
iulii
ili"
r',igl',er
ievet
circuit
breakers'
trip
units
continue
their
pr;-b;;At#-,.ed
tripping
functions
at their
set
time
delavs'
Static
Trip
lll
trip
units
may
be
connected
together
to
form
a
Ion"
int,jifo"k
network.
They
may
also
be
connected
into
a
,on"
ini"rfo"k
network
witl-L
Siemens'
molded
case
and/or
,rrlut"O
case
circuit
breakers'
trip
units
The
connection
of
btr;i;irip-il'l
trlp
units
into
a
zone
interlock
network
is
with
a
fVrfiipf"x'"rnranslator
or
with
Zone
Interlock
Expander(s)
and
Zone
tntertock
Couplers
(see Accessories
section)
The
1 5-pin
sub
"D"
connector
on
ih"
front
of
the
trip
unit
is used
in
"onn""t,Ctf',e
trip
unit
into
the
network'
The
zone
interlock
"ln/
Ort;
.*t""n
on thb
front
of the
trip
unit
provides
local
configu-
Ltion
control.
Setthezone
interlockswitch
tothe'Out"
position
*f,en not
used
in azone
interlock
network
to
avoid
selective
coordination
Problems.
Main
)--
Feeders
Example
oI
Zone
lnterlocking
Connectlon
between
Static
Trip
ll
I devices
20

Siemens Static Trip III Specifications

General

Brand	Siemens
Model	Static Trip III
Category	Circuit breakers
Language	English