TriggerHarmonicLevel('Expression',"'LimitProfile*'",'Harmonic*')
Arguments
|
'Expression' |
Measuring signal |
|
"'LimitProfile*'" |
Name of the limit profile defined in the PQU |
|
'Harmonic*' |
Order (harmonic), the limit value of which is to be monitored, values 0 to 50 |
Parameters ending with * are only evaluated once at the start of the acquisition.
Description
Trigger fires (result true) when the signal value is above the harmonic limit defined in the "LimitProfile" profile of PQU. The "Harmonic" parameter determines which limit value is used from the limit profile.
Example
When measured on medium voltage switchgear, the U12 conductor voltage should be monitored for its harmonic content. A trigger signal should be triggered if the limit value specified in EN50160 for the third harmonic in a 10 minute interval is exceeded.
The limit profile is configured in the I/O Manager in the spectrum modules. The profile name is "EN50160 – Medium voltage – Harmonics".
The limit values can be viewed with Configure profiles. In our example, the limit for the third harmonic is 5 %.
Solution
Fig. Configuration of the TriggerHarmonicLevel expression
The trigger fires if the 10 min value of the third harmonic of U12 is above 5 %.