Manufacturer
Emirel
Name
E 491N
Country
Italy
Type
Wattmeter relay
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FUNCTION
The wattmetric relay E 491N measures
the voltage (V) and the current in the
line (I), besides it computes the cosj
and the ACTIVE POWER as product
of:
W = 1,73 V I cosj
USE
The electric motor is the most common
load to be controlled by an active
power relay. The active power supplied
to the motor gives the direct
information of the instant load of the
motor itself.
Such information is more accurate than
the one given by the current value.
As a matter of fact the cosj variations
may change the power value without
affecting the current value.
