SATEC EM720 Operation Manual - Manual (Page 73)

Chapter 5 Configuring the EM720
General Meter Setup
EM720 Power Quality and Revenue Meter 73
Instrument Transformer Correction Setup
Transformer correction allows you to compensate ratio and
phase angle inaccuracies of the voltage and current
instrument transformers.
Select General Setup from the Meter Setup menu, and then
click on the Transformer Correction tab.
The available options are listed in the following table.
Parameter Options Description
Channel None, V1-V3, I1-I4 Voltage/current channel
Test Point, % 5-200% Percent of the nominal (rated) voltage/current at
which the ratio correction factor and phase angle
error are specified
Ratio Correction Factor 0.900-1.100 The ratio of the true transformer ratio to the
marked ratio
Phase Angle Error +/-600 minutes The phase displacement, in minutes, between
the primary and secondary values. The phase
angle of a transformer is positive when the
secondary value leads the primary value.
You can define a total of 56 correction points for ratio and
phase correction data - up to 8 test points per voltage and
current channel, based on the transformer’s accuracy
characteristics. If more than one test point is given for a
channel, the meter dynamically interpolates to the actual
operating point depending on the measured voltage or
current. When a single test point is defined, it is applied over
the full operating range of the transformer.