Instrument Transformer Correction Setup - Satec expertmeter EM720 Operation Manual

Chapter 5 Configuring the EM720

Instrument Transformer Correction Setup

Parameter
Channel
Test Point, %
Ratio Correction Factor
Phase Angle Error
EM720 Power Quality and Revenue Meter
Transformer correction allows you to compensate ratio and
phase angle inaccuracies
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.
Options
None, V1-V3, I1-I4
5-200%
0.900-1.100
+/-600 minutes
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,
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.
General Meter Setup
of the
Description
Voltage/current channel
Percent of the nominal (rated) voltage/current at
which the ratio correction factor and phase angle
error are specified
The ratio of the true transformer ratio to the
marked ratio
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.
based on the transformer's
voltage and current
accuracy
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