ABB Remote I/O RIO600 Installation And Commissioning Manual page 117

1MRS757488 H
RIO600
Installation and Commissioning Manual
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GUID-F26BC54D-46C8-4D94-8A49-EC101D51664C V1 EN
Figure 63: Earth-fault in a compensated network
Directional earth-fault characteristic
Phase angle characteristic
The operation criterion phase angle is selected with the Operation mode setting using
the value "Phase angle".
The forward and reverse sectors are defined separately. The forward operation area is
limited with the Min forward angle and Max forward angle settings. The reverse
operation area is limited with the Min reverse angle and Max reverse angle settings.
The sector limits are always defined as positive degree values.
In the forward operation area, the Max forward angle setting defines the clockwise
sector and the Min forward angle setting defines the counter clockwise sector,
measured from the Characteristic angle setting.
In the reverse operation area, the Max reverse angle setting defines the clockwise
sector and the Min reverse angle setting defines the counter clockwise sector,
measured from the complement of the Characteristic angle setting (180° phase shift).
RCA is set to positive if the operating current lags the polarizing quantity. It is set to
negative if it leads the polarizing quantity.
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Section 6
Commissioning
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