
8
GB
Power
Þ
nominal current conversion
In order to have a quick check of the device
working conditions, we provide you the formulas
to calculate the nominal current for each device in
relation to the total power and the connection
type.
Preliminary notes:
1)
Only a resistive load must be applied to the
device, so in the following formulas the cos
f
will be considered equal to 1.
2)
the formulas related with the 3-phase
applications are referred to a balanced
3-phase system only.
Single-phase connection
I
P
V
RMS
RMS
=
where:
P = power (in Watts).
V
RMS
= phase to neutral or phase to phase
voltage (in Volts)
I
RMS
= nominal current (in Amperes)
3 -phase without neutral connection (star or
delta application)
I
P
V
RMS
RMS
=
·
3
where:
P = Total load power (in Watts).
V
RMS
= phase to phase voltage (in Volts)
I
RMS
= nominal current (in Amperes)
3-phase with neutral connection (star
application)
I
P
V
RMS
RMS
=
·
3
where:
P = Total load power (in Watts).
V
RMS
= phase to neutral voltage (in Volts)
I
RMS
= nominal current (in Amperes)
ESR-AC10A.p65
2/8/02, 2:21 PM
8
2 rue René Laennec 51500 Taissy France
Fax: 03 26 85 19 08, Tel : 03 26 82 49 29
E-mail:[email protected]
Site web : www.hvssystem.com