ABB Remote I/O RIO600 Installation And Commissioning Manual page 165

1MRS757488 H
RIO600
Installation and Commissioning Manual
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):
 
1
∆
I
FPI_EF =
  EF  
abs
1
∆
I
 
o
GUID-1A35269E-D21A-4340-81F9-4F1CD84FF8E9 V1 EN
The indication of fault passage is declared when the current ratio of
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no longer active.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.
Section 6
Commissioning
(Equation 26)
Equation 26 is
157