Siemens Static Trip III User Manual

lnstallation
and
Adjustments
lnstructions
Ground
Fault
DelaY
il,"
gtornO fauli
delay
sets
the
tripping
delay
of the
trip
unit
in
i""pin."
6
igr.orno
current
in
excess
of
the
ground fault
pi"[rp i"u"f
tfrE
ground fault
delay
band
is
an
inverse
l2t ramp
iunction
that
reveits
to a
fixed
delay
at the
value
selected
with
if',"
gt;unO fault
delay
switch.
The
lower
value
of
the
l'?t
delay
Ouni
"
presei
to
a
value
of
.5 seconds
at
a
ground current
"orr"tp,jnJing
to
t.S
times
the
ground fault
pickup The
fixed
delay
may
belet
to
10,
25,
or
.40
seconds'
Example
-
Ground
Fault
DelaY
Bands
Ground
Fault
MemorY
Circuit
ALt Static
Trip
lll
trip
units
with
ground fault
protection
come
equipped
with
a
ground fault
memory
circuit
This circuit
efieitivety
integraies
ground
fault
currents
with
time
This
p;;;".;. adled
pro-tection
by
preventing the
ground fault
delay
circuits
from
being
reset
when
the
ground
fault currents
u[-ini"tritt"nt
and/or
erratic.
The
time
constants
for
the
current
integration
are
preset within
the
trip
unit
as a
function
of
the
ground fault
delaY.
Constructing
a
Time'Current
Curve
in"
toLfo*indinstructions
are
for
constructing
a
Time-Current
Curve
for
atrip
unitwith
long
time,
shorttime,
and
instantaneous
Lutt
protection,
The
conslruction
of
a curve
for
ground
fault
pr-otection
or
for
trip
units
without
short
time
or
without
instan-
ianeous
fault
protection is
very
similar'
i.
Setect
the
long
time
setting
and
delay
band
to be
used'
Example:
.6
long
time
setting
'1O-second
delaY
band
2.
Select
the
short
time
PickuP
Example:
4 times
the
long
time
setting
lc)
3.
Lightly
trace
a
line
from
the
long
time
pickup
point
to
the
-
[i"r#""
point
given in the
table
below
for
the selected
L""g
T*"
O"tay"aanO
Now
darken
the
line
between
the
L"g"ti;"
ptku6
point
and
the
intersection
with
the
mini-
,ril
if-,oti
time
pickup line;
extending
the
trace'
if neces-
tuiy
ttf-,it
ini"rsection
defines
the
shori
time
pickup
point)
if-li6
fln"
i. tf,"
lower
limit
of the
long
time
delay
band
(Note:
*itf',orisf,ott
time
fault
protection
the
line
would
extend
to
the
instantaneous
PickuP
Point
)
L-;pl;
-
ito,
(1,
3b0
sec)
to
short
time
pickup
point
(The line
would
Pass
through
the
reference
Point
(6x, 10
sec)
)
Lono
Time
Long
Time
Reference
Dela]r
Band
PickuP
Point
l^oinl
5o
t,j"onot
(1x 1O8O
sec)
(6x' 30
sec)
i;;;;4.
(tx,
otz
sec)
(6x 17 sec)
ro
seconOs
(tx,
gOo
sec)
(6x' 10 sec)
o
r""".0.
(tx
zto
secl
(6x,
6
sec)
5.s
s"conot
(tx,
tzo
sec)
(6x,3 5
sec)
4.
Drawavertical
linefrom
thetop
of
the
graphtothe
longtime
pi"frp
[oint.
This
line
defines
the
minimum
long
time
pickup.
Erur'pf",
From
(1x, 1OO0O
sec)to
(1x'
360
sec)
Select
the
short
time
delay
band
to
be
used'
Example:
,3-second
delaY
band
Draw
a
vertical
line
from
the
short
time
pickup
point on
the
[ng
t-"
J"f
iy
line
to the
selected
short
time
delay
This
tlne"defines
the
minimum
short
time
pickup'
Example:
From
the
short
time
pickup
point
to
.3-second
time
line
Select
the
instantaneous
PickuP'
Example:
12 times
current
sensor
rating
Since
the
instantaneous
pickup is
selected
with
respect
to
if-l"irit"nt
t"nsor
rating,
it
must
be
divided
bythe
long
time
pl"t
rp
to
determine
its
position on
the
graph'
ExamPle:
12
+
.6
=
20
6.
8.
Draw
a
horizontal
line
along
the
short
time
delay
line
from
-
the
short
time
picku
p
line
to
ihe
instantaneous
picku
p point'
ihi,
tin"
is
the
lower
limit
of
the
short
time
delay
band'
f*umpfe'
From
4 to
20
along
the
3-second
time
line
9.
Draw
a
vertical
line
from
the
instantaneous
pickup
point to
-
th;
bottom
of
the
graph
This
line
defines
the
minimum
instantaneous
PickuP.
ir*pll,
From
(2bx. .3
sec)to
(2Ox'
01
sec)
10.
The
maximum
lines
of
the
long
time
pickup' long
time
delay
"
O""J
u.O
short
time
plckufare
offset
from
the
minimum
[nbt
OV
20%.fhe
maximum
line
of
the
short
time
delay
bu;;
id
.07
seconds
greater than
the
delay
setting'
Draw
these
lines,
i;pi"'
a
Maximum
long
time
pickup.is
a
vertical
line
trom
(1
.2x,
10b00
sec)
to
(1
2x
360
sec)
b.
Maximum
long
time
delay
is
from
(1
2x'
360
sec)
to
maxiftum
short
time
pickup
(4
x
120"k
=
4.8).
The
line
would
pass
through
the
new
ref eience
point
(6
x
120%
=7
2x'
10
sec)
c
Maximum
short
time
pickup is a
vertical
line
f rom
the
pickup
point
to
the
37-second
time
line.
10
Ground
Current
in
Percent
of
Ground
Sensor
Rating
100
1 000
10
o
E
E
o
o
6)
a
,E
o
E
F
ba
np
i
l
I
nd
ck
l
llr _H+l
fl-,1T'nn
I
lll
lrl llll'tDelayband,
{Hf,g?iffm
oicxT
11D
mini
elay
mur
-l
Tt
rl
,\ I
.4 seconc
-delay
bal9
..25
seconc
delay
banc
lll,ll
r';'.:l],:,:',r
:"
r'
'1*l*1'r
it 1r
t
-.1
seconc
delay
banc

Siemens Static Trip III Specifications

General

Brand	Siemens
Model	Static Trip III
Category	Circuit breakers
Language	English