Phase-to-phase current variation
Phase-to-phase current variation one is main startup element. It covers most of the
abnormal status of the system. The phase-to-phase current variation fails in high
impedance faults, three-phase fault on weak side and switch onto fault on unloaded line
because of low sensitivity in these cases.
Phase-to-phase current variation takes the current samples as input and the signal is
evaluated using the sampling value based algorithm.
The phase-to-phase current variation criterion is shown below:
1.8
T
ZD
i
I
I
FF
D
>
D + D
EQUATION2255 V1 EN
Where:
Δi
ФФ
sampling value of phase-to-phase current variation
ΔI
ZD
setting of fixed threshold, which corresponds to setting
ICV>. The default value for the
setting is 0.2·
IBase, where IBase is the base current.
ΔI
T
float threshold
It is the full-circle integral of the phase-to-phase current variation
2
1
1
|
(
) |
T
T
n T
I
i
t n
T
-
FF
=
D =
D
-
å
EQUATION2256 V1 EN
Where:
T
count of sample values in one cycle
Δi
ФФ
is calculated using the below formula:
( ) [ ( )
(
)] [ (
)
(
2 )]
( ) 2 (
)
(
2 )
i k
i k
i k N
i k N
i k
N
i k
i k N
i k
N
D
=
-
-
-
-
-
-
=
-
-
+
-
EQUATION2257 V1 EN
N is the number of samples in one cycle.
Section 5
1MRK505222-UUS C
Differential protection
166
Technical reference manual
Содержание Relion 670 series
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