Tripping Characteristics Of Standard Series Overcurrent Tripping Device With Long Delay And Instantaneous - Westinghouse DB-50 Instructions Manual

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Page 16
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200
eo reset table delay ®=+ -
�
;
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s o
; o
5 0
�d�� :��� �i �
pickup and
: �
40 ·100% i o n� delay selli n g&
20
·
-
l/ 0 pickup and
3° lono delay sellings 80
20
:::
trip u n it r ati n g (amp s)
:
1600
=
.. 1200
"0
"
1000
0
-
"
• 4
notes:
.. _
3
-
- - BOO
_
"
Total clearino time is the durati o n of
•
Q)
faull current flow, i n cl u ding arcing
ti m e.
Resetlable delay curve shows the
allowable duration of current flow
for which the breaker will not tri p
- ­
if the overcurrenl subsides wi t hi n
---
that time to
breaker long delay pickup selling.
80o/ o
If the duration of overcurrenl ex-
ceeds the lime jndi c ated by the
--·
rneltable de toy curve, the breaker
overcurr e nt devI c e may not reset
and may eventually trip the
breaker.
_ ® Ap pli ca ble on t y wh ere fa u l t cu rrent
don not exceed
_
Appli c able only where fault current
®
does not exceed
Applicable only where fault current
does not exceed
20
'015 6
7 8910
current i n percent of breaker tri p un� ratigq
o
I
second
second
second
�
soo® 300 @
3
2 5 0
5 oo 0
400®
225
3
200
350G)
3
or l e ss of the
0
42000A(rms aym)
(rms syml
_
50 � 0fA
( rms a ym )
65000 A
� � � § n��
0
current in percent of breaker tri p unit rating N
7
-
Fig. Tripping Characteristics of Standard Series Overcurrent
Tripping Device with Long Delay and Instantaneous Elements
8 °0 g 00
§
§
o c oc o
l
long delay pickup settings-adjustabl e with
percent of tri p uni t rating 80,100,120,140,
160
total clearing timeCD!m
pickup and
pickup and
30
pickup and 20
160°/o 30
calibrated marks at
instantoneo1:1 s pickup selling -adjustabl e
wi t h cal i brated marks at
percent of tri p unit rating
� I ' � § � U§
0
g
g
o o
8
g
o
and
second l a ng delay settings
second l o ng delay settings
__j
second long delay settings -i-+-l--t- H 70
ond seconds
30
20
-
and
800 1200
I i II � �
gg8
8
oo
7 oo
400
300
200
� 0
eo
___ ,_
60
40
50
5 0
6
8
1
�
5 �
4 " ., •
3 "
1
g:
2
�
1
7
4
3
t
01
04
05
0 5
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