ABB 615 series Technical Manual page 336

Section 4
Protection functions
330
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 grounding so that in an isolated network the
Characteristic angle (φ
RCA
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 ground-fault characteristics, see
the Directional ground-fault characteristics
For definitions of different directional ground-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
1MAC059074-MB A
= 0°. In addition,
RCA
section in this manual.
615 series ANSI
Technical Manual