7SR210 & 7SR220 Description of Operation
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Page 43 of 94
3.6
Current Protection: High Impedance Restricted Earth
Fault (64H)
One high impedance Restricted Earth Fault (REF) element is provided.
The relay utilises fundamental current measurement values for this function.
The single phase current input is derived from the residual output of line/neutral CTs connected in parallel. An
external stabilising resistor must be connected in series with this input to ensure that this element provides a high
impedance path.
64H Current Setting
sets the pick-up current level. An output is given after elapse of the
64H Delay
setting.
External components – a series stabilising resistor and a non-linear resistor – are used with this function. See
‘Applications Guide’ for advice in specifying suitable component values.
Operation of the high impedance element can be inhibited from: -
Inhibit 64H
A binary or virtual input, function key or remote data Comms
Figure 3.6-1 Logic Diagram: High Impedance REF (64H)
Содержание Argus 7SR21
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