EMR-5000
IM02602012E
Testing the trip delay:
Apply a balanced three-phase voltage system (nominal voltages).
Switch off VA (the threshold value »
Threshold« for
»
V2 Fund.« must be below 33% of the nominal voltage Vn).
Measure the tripping time.
The present voltage unbalance
»
V2 Fund.« corresponds with 1/3 of the existing phase voltage displayed.
Testing the threshold values
Configure minimum »
%(V2/V1)« setting (2%) and an arbitrary threshold value »Threshold« (V2 Fund.).
For testing the threshold value, a voltage has to be fed to phase A which is lower than three times the adjusted
threshold value »
Threshold« (V2 Fund.).
Feeding only phase A results in »
%(V2/V1) = 100%«, so the first condition »%(V2/V1) >= 2%« is always fulfilled.
Now increase the phase A voltage until the relay is activated.
Testing the dropout ratio of the threshold values
Having tripped the relay in the previous test, now decrease the phase A voltage. The dropout ratio must not be higher
than 0.97 times the threshold value.
Testing %(V2/V1)
Configure minimum threshold value »
Threshold« (V2 Fund.) (0.01 x Vn) and set »%(V2/V1)« greater or equal to
10%.
Apply a balanced three-phase voltage system (nominal voltages). The measuring value of »
%(V2/V1)« should be
approximately 0%.
Now increase the phase A voltage. With this configuration, the threshold value »
Threshold« (V2 Fund.) should be
reached before the value »
%(V2/V1)« reaches the set »%(V2/V1)« ratio threshold.
Continue increasing the phase 1 voltage until the relay is activated.
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