22
Additional support insulators
To avoid unacceptable high electrodynamic impact on the ISM, the bus bar connections shall rest on additional
supporting insulators (Figure 25). Additional support insulators are necessary, if the length of unsupported busbars
is more than specified in the table below.
Note: Deviation from mounting requirements specified in the present section may lead to permanent damage of the
module in short-circuit making current.
Minimum Clearances due to Rated Ins ulation Voltage
The minimum clearances between the blank phases
and to ground shall be according to DIN EN 60071-1,
VDE 0101 and VDE 0111.
Minimum clearances from ISM-surfaces to ground
Any switchboard, where switching module is
expected to be used shall be designed so as to
exceed minimal distances shown on figure 24.
Values for terminals covered with insulating caps
and Raychem-type tubes are bracketed.
Figure 24
Minimum distances between parts of switching module
and grounded metal enclosure of switchboard
Figure 25
Ur
Up
Minimum clearance
(L
2
)
15 kV
95 kV
120 mm
Module
Short-circuit current, kA
20 kA
25 kA
31.5 kA
L
1
, mm
ISM15_Shell_2(150)
700
450
300
ISM15_Shell_2(180)
840
540
360
ISM15_Shell_2(210)
980
630
420
ISM15_Shell_2(275)
1200
820
550
L
2
L3
Additional insulating caps for ISM15_Shell_2(150)
Additional insulation of terminals is obligatory
for ISM15_Shell_2(150). These shall used for other
types of the switching module when air isolating
distances between terminals and contacts arms,
on the one hand, and grounded metallic frame
and enclosure of switchboard, on the other, do
not provide dielectric strength required for high-
voltage tests.
The total arrangement of additional insulation is
shown on figure 26. Terminals are covered with
insulating caps. Bare parts of contact arms, i.e.
parts not covered with this insulation, shall be
imbedded into Raychem-type shrinkable tubes.
Metal
housing
40 (30)
50 (50)
120
(70)
Figure 26
Insulating caps
3
Summary of Contents for ISM Shell_2 Series
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Page 6: ...6 1 THIS PAGE INTENTIONALLY LEFT BLANK...
Page 7: ...7 Introduction 1...
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Page 13: ...13 Receiving Handling and Storage 2...
Page 19: ...19 Ins tallation 3...
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Page 37: ...37 Switching and Control Functions 4...
Page 41: ...41 Commiss ioning Maintenance 5...
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Page 45: ...45 Signalling 6...
Page 49: ...49 Special Applications Fast Switching 6...
Page 53: ...53 Product Line 7...
Page 55: ...55 Dimens ions and Weights 8...
Page 61: ...61 8 Mating part with interlocking lever Interlockingshaftwithmountedinterlockinglever...
Page 62: ...62 Circuit Diagrams 9...
Page 63: ...63 ISM15_Shell_2 with CM_1501_01 9...
Page 64: ...64 ISM15_Shell_2 with CM_16_1 9...
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Page 66: ...66 Technical Data 10...
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Page 72: ...72 Regulations and Ambient Conditions 11...
Page 74: ...74 Legal Information 12...
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Page 79: ...79 Date 12...
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