Figure. 5.5.3 - 170. Simplified function block diagram of the total harmonic distortion monitor function.
Measured input
The function block uses analog current measurement values. The function always uses FFT
measurement of the whole harmonic specter of 32 components from each measured current channel.
From these measurements the function calculates either the amplitude ratio or the power ratio. A -20
ms averaged value of the selected magnitude is used for pre-fault data registering.
Table. 5.5.3 - 179. Measurement inputs of the total harmonic distortion monitor function.
Signal
Description
Time base
IL1FFT
FFT measurement of phase L1 (A) current
5ms
IL2FFT
FFT measurement of phase L2 (B) current
5ms
IL3FFT
FFT measurement of phase L3 (C) current
5ms
I01FFT
FFT measurement of residual I01 current
5ms
I02FFT
FFT measurement of residual I02 current
5ms
The selection of the calculation method is made with a setting parameter (common for all measurement
channels).
General settings
The following general settings define the general behavior of the function. These settings are static i.e.
it is not possible to change them by editing the setting group.
Table. 5.5.3 - 180. General settings.
Name
Range
Step
Default
Description
Measurement
magnitude
1:
Amplitude
2: Power
-
1:
Amplitude
Defines which available measured magnitude the function
uses.
A
AQ
Q-C213
-C213
Instruction manual
Version: 2.04
264
Содержание AQ-C213
Страница 1: ...AQ C213 Capacitor bank protection IED Instruction manual ...
Страница 308: ...Figure 7 4 184 Example block scheme A AQ Q C213 C213 Instruction manual Version 2 04 307 ...
Страница 330: ...Figure 8 14 207 Panel cutout dimensions and device spacing A AQ Q C213 C213 Instruction manual Version 2 04 329 ...