ABB Remote I/O RIO600 - Page 136

When Operating Quantity is set to "Amplitude", settings Min Forward Operate
Current and Min Reverse Operate Current are compared to the amplitude of
I
stab
0
1
in
the whole defined operate sector (see
Figure 74). This selection can be used in
unearthed networks.
Tilt
angle
-90 deg
+90 deg
+45 deg
Im(Ȳo)
0 deg
Re(Ȳo)
REVERSE
REVERSE
Ȳ
osum_CPS
❶
❷
Ȳ
osum_CPS
FORWARD
Ȳ
osum_CPS
❸
FORWARD
Ȳ
osum_CPS
❹
GUID-7B471332-D476-47A3-B37B-C147835657CA V1 EN
Figure 74: Illustration of amplitude and resistive current sectors when
directional mode is set to "Forward" and setting operating quantity =
"Amplitude"
If the “Adaptive” or “Resistive” operating quantity is selected, setting Min Forward
Operate Current should be set to a value less than p ⋅ IR
tot
.
IR
tot
is the total resistive earth-fault current of the network corresponding to the
resistive current of the parallel resistor of the coil and the network losses of the system
(typically in order of 1…5% of the total capacitive earth-fault current of the network).
p is the security factor (0.5…0.7).
This setting should be set based on the total resistive earth-fault current of the network
including the parallel resistor of the coil and the network losses. It must be set to a
Section 6 1MRS757488 H
Commissioning
128 RIO600
Installation and Commissioning Manual