ISA T 2000 - Page 20

DOC. MIE11110 Rev. 5
Page
20
of
110
The screen shows:
. The secondary current;
. The secondary voltage;
. The phase angle, in degrees, between current and voltage, with
the voltage taken as the reference. Usually this angle will be
negative, because the burden is inductive;
. The corresponding power factor;
. The VA burden at the nominal current IN. Also this
measurement will not change very much with the test current.
Remember that if you test with a current more than 100 A the
test will have a limited duration, as per the following table.
CURRENT
OUTPUT
A
OUTPUT
POWER
VA
LOAD
TIME
s
RECOVERY
TIME
min
I SUPPLY AT
MAX VA
A
100 600 STEADY - 2.8
150 800 15 min 30 4.2
200 1000 4 min 15 5.6
400 1600 15 5 11.3
600 2000 5 3 17
800 2000 1 2 22.6
Keep the test duration as short as possible: if you exceed the
above table, the test set stops automatically the test, and you
have to wait until the recover time is elapsed. Also, consider that
you are sinking power from the mains supply: the supply cable
wires should have a cross section suitable for a current supply of
10 to 20 A. The table shows the full power current sink from the
mains as a function of the output current.