ABB Remote I/O RIO600 Installation And Commissioning Manual page 135

1MRS757488 H
RIO600
Installation and Commissioning Manual
REVERSE
REVERSE
GUID-CAFA60CF-AD7B-4EAB-848A-B565A5CEBF20 V1 EN
Figure 73: Illustration of amplitude and resistive current sectors when
directional mode is set to "Forward" and setting operating quantity =
"Resistive"
The resistive mode is valid for resonant earthed networks and high-resistance earthed
systems, but not in case of unearthed networks. The resistive mode must be selected
when there is a risk of local overcompensation of a protected feeder, that is, when the
earth-fault current is compensated with distributed compensation coil and their
inductive current exceeds the amount of capacitive current produced by the phase-to-
earth capacitance of the feeder.
In compensated networks, where distributed compensation coils are
also used to compensate earth-fault current, setting Operating
Quantity should be set to "Resistive". This enables secure and
dependable directional determination also in case of local
overcompensation where the earth-fault current produced by the
healthy feeder can become inductive.
+90 deg
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Ȳ
osum_CPS
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Tilt
angle
-90 deg
Section 6
Commissioning
+45 deg
FORWARD
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FORWARD
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osum_CPS
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Re(Ȳo)
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