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1773/1775/1777
Users Manual
28
Voltage and Current Ratio
If a voltage and current transformer is included in the measured circuit, you can choose a
multiplier so that the results appear in the correct engineering units, for example, kV or MW.
To set the ratio for phase voltage and neutral:
1. Select the primary ratio (which is then compared to 1).
The touchscreen number pad opens. When the ratio is expressed as 1000:25, the setting is
40:1. Most often the ratio is expressed with reference to 1.
2. To clear the default 1 in the display, tap .
3. Input the new number using the touchscreen number pad.
In the current ratio screen the default setting is Auto. In this mode the Analyzer adjusts
automatically to get the best measurement resolution. You can change the current range to a
fixed range that is dependent on the connected current flex or probe device. The Analyzer
automatically detects a connected device. Detection includes specific information about the
device such as the serial number and the calibration constant for the best results.
Flicker
The Flicker setting is adjustable to a selected nominal voltage value. This value enables the
correct evaluation of any recurrent small changes on the electrical system caused by other
loads connected to the power system in the local electrical system or on the power utilities
network.
The preferred setting is Match Nominal Voltage, which is the nominal voltage selected for the
Analyzer. Flicker is measured in accordance with the IEC 61000-4-15 standard.
K Factor
K Factor is a ratio that expresses potential energy losses experienced in transformers due to
harmonics and eddy current losses at the fundamental frequency. There are two methods to
make the K Factor: IEEE C57:110 and EN 50464-3/EN 50541-2. Selection of the method is
usually dependent on the selected type of K rated transformer specification. K rated
transformers are designed and built to alleviate the effects of harmonics that may increase the
temperature of the transformer. Other values selected in this screen include harmonics and
constants e and q. You can select the 40
th
or 50
th
harmonics for inclusion in the calculation. The
constants e and q refer to eddy current loss at the fundamental frequency divided by the loss
due to a dc current equal to the RMS value of the sinusoidal current. This is an exponential
constant that is dependent on the type of transformer winding and frequency.
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