ABB RELION REX640 Technical Manual page 458

Protection functions
angle is positive if the operating current lags the polarizing quantity and negative if
it leads the polarizing quantity.
Example 1
The "Phase angle" mode is selected, compensated network (φRCA = 0 deg)
=> Characteristic angle = 0 deg
Figure 256: Definition of the relay characteristic angle, RCA=0 degrees in a
compensated network
Example 2
The "Phase angle" mode is selected, solidly earthed network (φRCA = +60 deg)
Characteristic angle = +60 deg
=>
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1MRS759142 F
REX640
Technical Manual