Siemens 3TM Panduan Petunjuk Pengoperasian - Halaman 20
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Description
Insulating capacity
Fig. 16
Altitude correction factor K
20
Installation altitudes
Note
The installation altitude for the vacuum contactor is set at the factory according
to the ordering option.
As standard, 3TM vacuum contactors can be used at -1250 m to +2000 m. For high-
er operation heights, a configuration from 2000 m to 5000 m can be ordered.
The insulation capacity of insulation in air declines with rising altitude increases due
to the lower air density. As per IEC 62271-102, the rated lightning impulse voltage
values given in Fig. 11 are valid up to an installation altitude of 1000 m above sea
level.
Above an altitude of 1000 m, the insulation level must be corrected as shown in
Fig. 16:
a
U ≥ U
• K
0
a
U Rated withstand voltage U under standard reference
atmosphere
U
required rated withstand voltage for the installation
0
location
K
Altitude correction factor
a
m • (H - 1000)/8150
K
= e
a
Calculating the altitude correction factor K
H =
Site altitude in metres
m = 1 for AC voltage, lighting impulse voltage (between
phases, phase-to-earth, applied longitudinally)
Example
For a required rated withstand voltage of 75 kV at an al-
titude of 2,500 m, an insulation level of at least 90 kV un-
der standard reference atmosphere conditions is
required:
1 • (2500 - 1000)/8150
90 kV ≥ 75 kV • e
≈ 75 kV • 1.2
:
a
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2019-01-09