ISA T1000 PLUS User Manual page 71

DOC. MIE91093
The characteristic curve depends upon: voltage; current;
phase angle between them. The test of the characteristic curve
is therefore performed by a number of threshold tests, where
each point is found by setting two parameters as fixed and
changing the third one. The selection of which parameter to
keep fixed and which one should be changed asks for some
more consideration.
Let's start with the test of point A, that means to measure the
parameter K2. Finding it means to move from a point having
zero impedance and increasing the impedance along the –X
axis. As we have to generate voltage and current at a given
phase angle, the first step is to convert impedance into these
parameters. Steps to be followed are:
. Compute the impedance corresponding to K2 and K1. For
instance, if we have the following setting:
- VN = 100 V;
- IN = 5 A;
- ZN = 11.56 Ohm;
- K2 = 0,1;
- K1 = 1
Then:
ZA = 1.156 Ohm;
Rev. 1.34 Page 71 of 145