ABB RELION 620 Series Technical Manual page 382

Section 4
Protection functions
376
The network rotating direction is set in the protection relay using the
parameter in the HMI menu: Configuration/System/Phase rotation.
The default parameter value is "ABC".
If the Enable voltage limit setting is set to "True", the magnitude of the
polarizing quantity is checked even if Directional mode is set to "Non-
directional" or Allow Non Dir to "True".
The Characteristic angle setting is used in the "Phase angle" mode to adjust the
operation according to the method of neutral point earthing so that in an isolated
network the Characteristic angle (φ
= 0°. In addition, the characteristic angle can be changed via the control signal
RCA_CTL. RCA_CTL affects the Characteristic angle setting.
The Correction angle setting can be used to improve selectivity due the inaccuracies
in the measurement transformers. The setting decreases the operation sector. The
correction can only be used with the "IoCos" or "IoSin" modes.
The polarity of the polarizing quantity can be reversed by setting the Pol reversal to
"True", which turns the polarizing quantity by 180 degrees.
For definitions of different directional earth-fault characteristics, see
the Directional earth-fault characteristics
For definitions of different directional earth-fault characteristics,
refer to general function block features information.
The directional calculation module calculates several values which are presented in
the monitored data.
) = -90° and in a compensated network φ
RCA
section in this manual.
1MRS757644 F
RCA
620 series
Technical Manual