ABB Remote I/O RIO600 Installation And Commissioning Manual page 132

Section 6
Commissioning
124
1
3 I
⋅
1 0
CPS
Y
Re
= =
0 stab
1
U
−
0
CPS
GUID-213A397D-2A9F-493E-A0FC-F7242CF11F8C V1 EN
Stabilized fundamental frequency admittance estimate, which is result from fundamental
1
Y frequency admittance calculation utilizing the Cumulative Phasor Summing (CPS) technique
0
stab
Fundamental frequency zero-sequence current phasor calculated utilizing the Cumulative
1
I Phasor Summing (CPS) technique
0 CPS
Fundamental frequency zero-sequence votlage phasor calculated utilizing the Cumulative
1
U Phasor Summing (CPS) technique
0 CPS
Real part of stabilized fundamental frequency conductance estimate
1
G
ostab
Imaginary part of stabilized fundamental frequency susceptance estimate
1
B
ostab
1 1 1
I G j B
(
= + ⋅
0 ostab ostab
stab
GUID-789BBC8B-72F7-421B-A758-1F29A77FC2DC V1 EN
Real part of stabilized fundamental frequency conductance estimate
1
G
ostab
Imaginary part of stabilized fundamental frequency susceptance estimate
1
B
ostab
Stabilized fundamental frequency residual current estimate, which is obtained (after
1
I conversion) from the corresponding admittance value by multiplying it with the system
0
stab
nominal phase-to-earth voltage value
Real part of stabilized fundamental frequency residual current estimate
1
I
oCosstab
Imaginary part of stabilized fundamental frequency residual current estimate
1
I
oSinstab
The main advantage of the filtering method is that due to the admittance calculation,
the resulting current value does not depend on the value of fault resistance, that is, the
estimated current magnitude equals the value that would be measured during a solid
earth fault (Rf = 0 Ω). Another advantage of the algorithm is that it is capable of
estimating the correct current magnitude during intermittent earth faults.
The setting Min Forward Operate current defines the minimum operate current if the
operation direction is set to "Forward". The Min Reverse Operate current setting
defines the minimum operate current if the operation direction is set to "Reverse".
With the previously described special filtering technique, the settings Min Forward
Operate current and Min Reverse Operate current are based on fundamental
frequency residual current values.
1 1
 Y  j  Y 
Im
+
0 stab 0 stab
   
1
U I
)
⋅ = + ⋅
baseres oCosstab
1MRS757488 H
1 1
G j B
= + ⋅
osta b b ostab
1
j I
oSinsta b b
Installation and Commissioning Manual
(Equation 16)
(Equation 17)
RIO600