TAVRIDA ELECTRIC ISM_LD Series, Инструкция по применению

Страница: 21 / 70

21
3
Minimum Clearances due to
Electromagnetic Influence
The following clearances must be adhered to (Figure 28):
Coordination of Minimum
Clearances
In case that due to rated insulation voltage and
electromagnetic influence two different minimum
clearances (a, b) exist than at least clearance (b)
is to be selected. If the clearance is below (a), the
compliance with the rated insulation level shall be
approved by a voltage test (Figure 29).
Isc Minimum clearance (b)
16 kA, 20 kA 120 mm
25 kA, 31 kA 220 mm
Metal housin g
b
Metal housin g
b
a
Figure 28
Figure 29
Heat Sinks for Continuous Current >800A
The ISM15_LD modules are designed in such a manner that with installed heat sinks (two ITEA741394.006
per pole) at 1000 A rated current and 55°C ambient temperature, with free surroundings, no impermissible high
temperatures will arise at the hottest spots of the ISM. The arrangement is shown in Figure 30.
In order to decide whether for an ISM in the respective panel more intensive heat dissipation or a reduction of
the rated current values are required, a temperature rise test according to the relevant standards is recommended.
Initial state for ISM15_LD@ 1000A:
Two mounted ITEA741394.006 heat sinks or equivalent per pole.
Initial state for ISM15_LD@ <800A: Without heat sink.
10.5
20±0.2
35±0.2
75
80
100max
25
ITEA 741394.006
ITEA 301611.004 03
Heat sink
Bolt
Washer
Conical spring washer
Nut M1 0
Heat sink ITEA 741394.006
2 Holes
Figure 30