The blocking signal and the setting group selection control the operating characteristics of the function
during normal operation, i.e. the user or user-de ned logic can change function parameters while the
function is running. This only applies if the alarming is activated.
The outputs of the function are the START and ALARM ACT signals for the phase current ("THDPH")
and the residual currents ("THDI01" and "THDI02") as well as BLOCKED signals. The function uses a
total of eight (8) separate setting groups which can be selected from one common source.
The operational logic consists of the following:
input magnitude processing
threshold comparator
block signal chec
time delay characteristics
output processing.
The inputs of the function are the following:
setting parameters
digital inputs and logic signals
measured and pre-processed current magnitudes
The function outputs can be used for direct I/O controlling and user logic programming. The function
generates general time-stamped ON/OFF events to the common event buffer from each of the two (2)
output signals. The time stamp resolution is 1 ms. The function also provides a resettable cumulative
counter for the START, ALARM ACT and BLOCKED events.
The following gure presents a simpli ed function block diagram of the total harmonic distortion
monitor function.
Figure. 5.6.3. - 77. Simpli ed 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. 5.6.3. - 108. Measurement inputs of the total harmonic distortion monitor function.
Signal
Description
Time base
IL1FFT
Fundamental RMS measurement of phase L1 (A) current
5 ms
AQ-E215
Instruction manual
Version: 2.01
135
© Arcteq Relays Ltd
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