Both low impedance & high impedance are working in merz.-prize circulating current principle (i.e) under normal operating condition, incoming and out going current remains the same and hence no current flows through the relay operating coil.
Basic difference lies in how we are achieving the stability for external faults.
In low impedance relays, we have bias characteristics.Based on the external fault magnitude, bias increases.(in our
static relays, bias current is the average of incoming and outgoing currents) Operating current of the relay should exceed the setting current and the bias current.During internal fault condition all the current converges and hence operating current increases more than the bias and the relay operates.
In high impedance relays, stability is achieved by the external resistors connected in series with the relay operating coils and making it as voltage dependent.(this is why we call it as high impedance relays).Resistance should be calculated in such a way that the relay will not operate for the external fault (with one CT becoming completely saturated).
Basic difference lies in how we are achieving the stability for external faults.
In low impedance relays, we have bias characteristics.Based on the external fault magnitude, bias increases.(in our
static relays, bias current is the average of incoming and outgoing currents) Operating current of the relay should exceed the setting current and the bias current.During internal fault condition all the current converges and hence operating current increases more than the bias and the relay operates.
In high impedance relays, stability is achieved by the external resistors connected in series with the relay operating coils and making it as voltage dependent.(this is why we call it as high impedance relays).Resistance should be calculated in such a way that the relay will not operate for the external fault (with one CT becoming completely saturated).
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