Cutler-Hammer Digitrip RMS 510, Инструкция по эксплуатации

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I.L. 29-8858
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(S)
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a
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le Se
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ting
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2. 2.5, 3, 4,
5, 6, M,, M,
In M u l t i ples of
Rating Plug
Amperes On )
M1 and M2 Values are Specified on Rating Plug
Fig. 4.5 Instantaneous Current Settings
Note: For Testing Purposes Only: When using an
external single phase current source to test low level
ground fault current settings, it is advisable to use
the Auxiliary Power Module (APM) (See Fig. 7). Espe­
cially when the single phase current is low, without
the APM it may appear as if the trip unit does not
respond until the current is well above the set value,
leading the tester to believe there is an error in the
trip unit when there is none. The reason this occurs
is that the single phase test current is not a good
simulation of the normal three phase circuit. If three
phase current had been flowing, the trip unit would
actually have performed correctly. Use the APM for
correct trip unit performance whenever single phase
tests are made.
Available Settings
Gnd-Fault
�
Setting
A. B. C. D.
m
x ln
E.
F. H. K
e
Specific Values
Given on Circuit
Breaker Time-Current
Curve and in Tab l e
1
Fig. 4.6 Ground Fault Current Settings
Effective May 1 997
Page 9
TABLE 1 - GROUND FAU LT C U R R ENT SETTINGS
GROUND FAULT CURRENT SETTINGS
(AMPERES)<D
A B
c D E F H K
1 00 25 30 35 40 50 60 75 1 00
200 50 60 70 80 100 120 1 50 200
I§ 250
63
75
88
1 00
125 150 1 88
250
300 75 90 105 120 150 180 225 300
en
400
UJ
1 00 120 140 160 200 240 300 400
a:
UJ
600 150 1 80 2 1 0 240 300 360 450 600
a_
630 158 189 221 252 3 1 5 378 473 630
:2:
::s
800 200 240 280 320 400 480 600 800
(!)
1 000 250 300 350 400 500 600
750
1 000
:::>
-'
1 200 300 360 420 480 600 720 900 1 200
a_
(!)
1 250 3 1 2 375 438 500
625
750 938 1200
z
�
1 600 400 480 560 640 800 960 1 200 1200
a:
2000 500 600 700 800 1 000
1200
1 200 1200
Cl
2400 600 720 840 960 1 200 1200 1 200 1200
UJ
-'
-'
2500 625 750 875 1 000 1 200 1200 1 200 1 200
�
3000/3150 750 900 1 050 1 200 1 200 1 200 1 200 1200
en
�
3200 800 960 1 1 20 1 200 1 200 1 200 1 200 1 200
4000 1 000 1 200 1 200 1 200 1200 1 200 1 200 1 200
5000 1200 1200 1 200 1 200 1 200 1 200 1 200 1200
<D Tolerances on settings are
±10%
of values shown.
@
Refer to Type DS, type SPB or Series C R-Frame supplemental instruction
leaflets given in Section
9
for list of available rating plugs for each type circuit
breaker.
4.9 Ground Fault Time Delay Setting
As illustrated in Fig. 4.7, there are two different G round
Fault curve shapes, i.e. , fixed time (flat) or 12t response.
The shape selected depends on the type of selective
coordination chosen. The 12t response will provide a
longer time delay in the low-end of the ground fault cur­
rent range than will the flat response.
Five flat (.1 , .2, .3, .4, .5 sec.) and three 12t (.1 *, .3*, .5*
sec.) response time delay settings are available. The 12t
response settings are identified by the suffix asterisk (*)
that appears in the setting viewing window. The 12t
response is applicable to currents less than 0.625 times
the ampere rating of the installed rating plug
(In)·
For cur-
rents greater than 0.625 x
In
the 12t response reverts to
the flat response.
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