ABB Remote I/O RIO600 - Page 133

Setting Operating Quantity defines whether the current magnitude supervision is
based on the "Adaptive", "Amplitude", or "Resistive" methods. When Operating
Quantity is set to "Adaptive", the method adapts the principle of current magnitude
supervision to the system earthing condition. This is done by monitoring the phase
angle of the accumulated sum admittance phasor. In case the phase angle of
accumulated sum admittance phasor is greater than 45 degrees, the set minimum
operate current threshold is compared to the amplitude of
I
stab
0
1
(Figure 72). In case
the phase angle of accumulated admittance phasor is below 45 degrees, the set
minimum operate current threshold is compared to the resistive component of
I
stab
0
1
.
This automatic adaptation of the magnitude supervision enables secure and
dependable directional determination in compensated networks, and it is also valid
when network is unearthed (compensation coil is switched off).
If the operation direction is set to “Reverse”, the resistive and amplitude sectors are
mirrored in the operation characteristics.
Tilt
angle
-90 deg
+90 deg
+45 deg
Im(Ȳo)
0 deg
Re(Ȳo)
REVERSE
REVERSE
Ȳ
osum_CPS
❶
Ȳ
osum_CPS
❷
FORWARD
Ȳ
osum_CPS
❸
FORWARD
Ȳ
osum_CPS
❹
GUID-7C6A76D8-DD19-4953-AD97-19165FE035EC V2 EN
Figure 72: Illustration of amplitude and resistive current sectors when
directional mode is set to "Forward" and setting operating
quantity="Adaptive"
1MRS757488 H Section 6
Commissioning
RIO600 125
Installation and Commissioning Manual