Medium Voltage Application Guide
Medium Voltage Application Guide
Medium Voltage Application Guide
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2.<br />
ENVIRONMENTAL SPECIFICATIONS<br />
Environmental Specifications<br />
2.1 Environmental Specifications<br />
2.2 Physical Specifications<br />
The equipment shall be suitable for storage at temperatures from -25 ºC to +55 ºC.<br />
The equipment shall be suitable for use at temperatures from -10 ºC to +60 ºC.<br />
The equipment shall be suitable for use at temperatures up to 40 ºC without<br />
derating.<br />
The equipment shall be suitable for operation at altitudes up to 1000 m above sea<br />
level without derating.<br />
The equipment shall be suitable for use in environments with relative humidity<br />
between 5% and 95% (non-condensing).<br />
The equipment shall be modular in design and construction.<br />
The thyristor assembly for each phase shall consist of a discrete module, and be<br />
individually replaceable<br />
Replacement of a thyristor assembly by a qualified service technician shall not take<br />
longer than 10 minutes.<br />
The integrated starter must be enclosed up to IP4X and include:<br />
• Withdrawable Vacuum, fused Line contactor with ratings:<br />
• Fixed Vacuum Bypass contactor<br />
All contactors shall have the following ratings:<br />
1. Class: indoor withdrawable<br />
2. Rated <strong>Voltage</strong>: 12 kV<br />
3. Rated lightning impulse withstand voltage: 75 kV (peak)<br />
4. Rated 1-minute power frequency withstand voltage: 28 kV (rms)<br />
5. Rated Frequency: 50 Hz/60 Hz<br />
6. Rated short circuit breaking current: 20 kA (with fuses)<br />
7. Rated short circuit making current: 62.5 kA (with fuses)<br />
8. Duty: continuous<br />
9. Utilisation factor: AC3<br />
10. Protection coordination: Type 2<br />
11. Minimum Service Life: 100,000 operations at full operating current.<br />
• A pad-lockable earthing switch<br />
• All panels must provide separate chambers for all main sections including Bus<br />
bars, Line Contactor, Soft starters and LV control. The entire panel, including<br />
inter-chamber, must be arc fault certified to 31.5kA for 1 seconds.<br />
• All panels shall have the following ratings:<br />
1. IAC classified AFLR<br />
2. Rated short term withstand current: 31.5 kA for 3 seconds<br />
3. BIL: 75 kV<br />
• The equipment shall employ fibre-optic cabling to ensure complete isolation<br />
between low voltage and high voltage circuitry.<br />
3
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