It detects the presence of harmonics in the circuit that it is being measured and it trips when they
exceed a threshold that can be adjusted by the user. It receives the signal from a current transfor-
mer. Some models h***e the trans-former incorporated in the same relay, while for currents higher
than 200 A, thesignal has to be provided externally. In power capacitors, it is used to disconnect
them in the case that the harmonic level exceeds an established threshold, ***oiding in this way
them damage due to overcurrents. They incorporate a trip delay adjustment and a threshold
selection adjustment. Output is made by one change-over contact.
/Model
WDH50A