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6. Meetprincipe
Dit instrument is voorzien van een constante-stroom-circuit en voert
lekstromen (I) tussen FASE-NULGELEIDER (zie Fig.5) om de
verliesstroomschakelaars te activeren. Het instrument kan bovendien
lekstromen genereren en meten die naar de aarde vloeien (zie Fig.6).
Meten van de afschakeltijd
Meten en weergeven van de tijd tussen het begin van de
transmissie van lekstromen (I) en het afschakelen van de
verliesstroomschakelaar.
Meten van de uitschakelstroom
Stelselmatig de verliesstroom opvoeren vanaf 40% van
In; de stroomwaarde op het ogenblik van de afschakeling wordt
weergegeven.
De invloed van fluctuaties in de systeemspanning is kleiner met dit
instrument omwille van het geïntegreerde constante-stroom-circuit.
Fig.5 Fig.6
Leakage
current
Power
Load
LINE
NEUTRAL
KEW 5410
Constant
current
circuit
EARTH
KEW 5410
Constant
current
circuit
Leakage
current
Load
Power
LINE
NEUTRAL
16


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