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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
) = -90° and in a compensated network φ
RCA
= 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 ground-fault characteristics, see
the
Directional ground-fault characteristics
section in this manual.
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.
Section 4
1MAC059074-MB A
Protection functions
330
615 series ANSI
Technical Manual
Содержание Relion 615 series
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