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eVD4
7. Installation
7.1. General information
Correct installation is of primary importance. The
manufacturer’s instructions must be carefully
studied and followed. It is good practice to use
gloves for handling the pieces during installation
7.2. Installation and operating
conditions
The following Standards must be taken into particular
consideration during installation and service:
– IEC 62271-1/DIN VDE 0101
– VDE 0105: Electrical installation service
– DIN VDE 0141: Earthing systems for plants with rated
voltage higher than 1 kV.
– All the accident prevention regulations in force in the relative
countries.
7.2.1. Normal operating conditions
Follow the recommendations in the IEC 62271-1 and 62271-
100 Standards. In more detail:
Ambient temperature
Maximum
+ 40 °C
Average maximum over 24 hours
+ 35 °C
Minimum (according to class – 5),
apparatus for indoor installation (*)
– 5 °C
(*) For lower temperatures, please ask ABB.
Humidity
The average value of the relative humidity, measured for a period longer
than 24 hours, must not exceed 95%.
The average value of the pressure of the water vapour, measured for a
period longer than 24 hours, must not exceed 2.2 kPa.
The average value of the relative humidity, measured for a period longer
than 1 month, must not exceed 90%.
The average value of the pressure of the water vapour, measured for a
period longer than 1 month, must not exceed 1.8 kPa.
Altitude
< 1000 m above sea level.
7.2.2. Special operating conditions
Installation over 1000 m a.s.l.
Possible within the limits permitted by reduction of the dielectric resistance
of the air.
Increase in the ambient temperature
Reduction in the rated current.
Encourage heat dissipation with appropriate additional ventilation.
Climate
To avoid the risk of corrosion or other damage in areas with a high level
of humidity, and/or with rapid and extensive temperature variations, take
appropriate steps (for example, by using suitable electric heaters) to
prevent condensation.
Fig. 8a
For special installation requirements or other operating
conditions, please contact ABB.
The areas involved by the passage of power
conductors or auxiliary circuit conductors must be
protected against access by animals which might
cause damage or disservices.
7.2.3. Trip curves
The following graphs show the admissible number of closing-
opening cycles (No.) of the vacuum interrupters, according to
the breaking capacity (Ia).
Caption (Figs. 8...)
No.=Number of closing-opening cycles allowed for the vacuum interrupters.
Ia =Breaking capacity of the vacuum interrupters.
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