Typical setting for
Angle Sector
is 15…30 deg.
Typical setting for
Angle Offset Sector
is 45…65 deg.
Second condition for detection of fault passage is based on evaluation simultaneously
ratio of change due to earth fault in earth-fault current to residual current (fundamental
frequency):
FPI_EF
=
abs
I
I
EF
o
∆
∆
1
1
GUID-1A35269E-D21A-4340-81F9-4F1CD84FF8E9 V1 EN
(Equation 26)
The indication of fault passage is declared when the current ratio of
is
above setting
Ratio EF to Res Cur
.
Actual implementation uses CPS calculation. Accumulation of phasors is started
when the presence of earth fault in the network is confirmed and accumulation of
phasors is reset when the fault condition is over, and after
Reset Delay Time
has
elapsed.
Typical setting for
Ratio EF to Res Cur
is 0.2.
When all conditions for detection of fault passage are fulfilled, then FPIPTOC
functions starts. This is indicated by activation of
FPIPTOC_Start
output. The
FPIPTOC_Oper
output is activated when
Operate Delay Time
has elapsed.
The
FPIPTOC_ Start
signal is prolonged with setting
Reset Delay Time
. Proper
setting is 350...500 ms. In order to prevent unwanted function, reset between the
current spikes during intermittent earth fault,
Reset Delay Time
should have typical
value of 300…500 ms. After
FPIPTOC_Oper
is activated, then
Reset Delay Time
is
no longer active.
Start criteria of general earth-fault detection have a user settable
Start Delay Time
,
which is overridden in case instantaneous GFC-module start condition is fulfilled.
Raising edge of general earth fault criteria starts CPS calculation. Falling edge of
general earth fault criteria resets CPS calculation.
1MRS757488 H
Section 6
Commissioning
RIO600
157
Installation and Commissioning Manual
Summary of Contents for Remote I/O RIO600
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