Medium Voltage Application Guide

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ENVIRONMENTAL SPECIFICATIONS
Environmental Specifications
2.1 Environmental Specifications
2.2 Physical Specifications
The equipment shall be suitable for storage at temperatures from -25 ºC to +55 ºC.
The equipment shall be suitable for use at temperatures from -10 ºC to +60 ºC.
The equipment shall be suitable for use at temperatures up to 40 ºC without
derating.
The equipment shall be suitable for operation at altitudes up to 1000 m above sea
level without derating.
The equipment shall be suitable for use in environments with relative humidity
between 5% and 95% (non-condensing).
The equipment shall be modular in design and construction.
The power factor correction components must be installed in a dedicated panel
and not the soft starter panel.
The integrated power factor panel must be enclosed up to IP4X and include:
• Withdrawable Vacuum, fused contactor with ratings:
1. Class: indoor withdrawable
2. Rated Voltage: 12 kV
3. Rated lightning impulse withstand voltage: 75 kV (peak)
4. Rated 1-minute power frequency withstand voltage: 28 kV (rms)
5. Rated Frequency: 50 Hz
6. Rated short circuit breaking current: 20 kA (with fuses)
7. Rated short circuit making current: 62.5 kA (with fuses)
8. Duty: continuous
9. Utilisation factor: AC6
10. Protection coordination: Type 2
11. Minimum Service Life: 100,000 operations at full operating current.
• Inrush reactors designed to reduce the inrush current to that required by
IEC60871-1. The supplier must provide calculations for the correct selection of
the reactors.
• Capacitors shall be selected to improve the power factor to the level required
by the local utility.
• The capacitor shall have a voltage rating 20% above the nominal operating
voltage so as to be able to withstand high voltages associated with capacitor
switching.
• The capacitor circuit must be supplied from the line side of the soft starter.
• All panels must provide separate chambers for all main sections including
Busbars, Contactor, Capacitors. The entire panel, including inter-chamber,
must be arc fault certified to 31.5kA for 3 seconds.
• All panels shall have the following ratings:
1. IAC classified AFLR
2. Rated short term withstand current: 31.5kA for 3 seconds
3. BIL: 75kV
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