ABB Remote I/O RIO600 Installation And Commissioning Manual page 127

1MRS757488 H
RIO600
Installation and Commissioning Manual
taking into consideration the possible network topology changes, compensation coil
and parallel resistor switching status and compensation degree variations.
Multi-frequency admittance calculation
Multi-frequency admittance calculation module calculates neutral admittances
utilizing fundamental frequency and the 2nd, 3rd, 5th, 7th and 9th harmonic
components of residual current and zero-sequence voltage. The following
admittances are calculated, if the magnitudes of a particular harmonic in residual
current and zero-sequence voltage are measurable by the IED.
Fundamental frequency admittance (conductance and susceptance)
1
I
3
⋅
1 1
0
Y G j B
= = + ⋅
o
0
1
U
−
0
GUID-594F3E58-1090-49B0-BB46-B531EA1FDF4D V1 EN
Fundamental frequency neutral admittance phasor
1
Y
0
Fundamental frequency zero-sequence current phasor
1
I
0 1 1 1
I I I
+ +
A B C
( )
3
Fundamental frequency zero-sequence voltage phasor
1
U
0
1 1 1
U U U
+ +
A B C
( )
3
Fundamental frequency conductance,
1
G
0
1
Re( Y )
0
Fundamental frequency susceptance,
1
B
0
1
Im( Y )
0
Harmonic susceptances
1
o
Section 6
Commissioning
(Equation 8)
119