VAMP 265 - 2.4.7. Configuration Menu CONF

2.4 Configuration and parameter
setting
2 Local panel user interface
Operation and configuration
instructions
32
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VM265.EN011
2.4.7. Configuration menu CONF
The following functions and features can be read and set via
the submenus of the configuration menu:
DEVICE SETUP
 Bit rate for the command line interface in ports X4 and the
front panel. The front panel is always using this setting. If
SPABUS is selected for the rear panel local port X4, the bit
rate is according SPABUS settings.
 Access level [Acc]
LANGUAGE
 List of available languages in the relay
CURRENT SCALING
 Rated phase CT primary current (Inom)
 Rated phase CT secondary current (Isec)
 Rated input of the relay [Iinput]. 5 A or 1 A. This is specified
in the order code of the device.
 Rated phase CT’ primary current (I’nom)
 Rated phase CT’ secondary current (I’sec)
 Rated input of the relay [I’input]. 5 A or 1 A. This is
specified in the order code of the device.
 Rated value of I
0
CT primary current (Ionom)
 Rated value of I
0
CT secondary current (Iosec)
 Rated I01 input of the relay [Ioinp]. 5 A or 1 A. This is
specified in the order code of the device.
 Rated value of I
02
CT primary current (Io2nom)
 Rated value of I
02
CT secondary current (Io2sec)
 Rated I02 input of the relay [Io2inp]. 5A, 1 A or 0.2 A. This
is specified in the order code of the device.
The rated input values are usually equal to the rated secondary
value of the CT.
The rated CT secondary may be greater than the rated input
but the continuous current must be less than four times the
rated input. In compensated, high impedance earthed and
isolated networks using cable transformer to measure residual
current I
0
, it is quite usual to use a relay with 1 A or 0.2 A
input although the CT is 5 A or 1A. This increases the
measurement accuracy.
The rated CT secondary may also be less than the rated input
but the measurement accuracy near zero current will decrease.