ERL tesla lite, Руководство пользователя, Страница: 105 / 288

8 Configuring the Recorder
D03283R01.10 TESLA LITE User Manual 8-27
8.10 Impedance Channels
Description
Impedance Channels calculate impedance from voltage and current inputs. The
channel can produce either single phase or three phase values. Triggering is
based on the rate of impedance within a defined impedance circle centered
around the origin.
Input
Analog Input Channels, Summation Channels or Sequence Component chan-
nel can be used as inputs to an Impedance Channel. Using Sequence Compo-
nent as an input results in a three-phase impedance.
Calculation
The impedance calculation continuously recalculates the apparent impedance
from the selected voltage and current signals, then subtracts an earlier calculat-
ed value (determined by the “Rate of Change Interval” setting). The impedance
trigger operates if the difference is between the “Minimum Change” and
“Maximum Change” settings, and the calculated impedance is within “Circle
Radius” of the origin.
Triggers
Rate of impedance within a defined impedance circle.
Recording
Low Speed: Impedance magnitude at a rate of one value per cycle.
Number of
Channels
5 Impedance Channels are available.
Types
Z1 (impedance)
Notes
The impedance magnitude and angle readings are also available to the meter-
ing display, SCADA and the long term trending function.