Woodward
Manual MRIK3-C EN
40
DOK-TD-MRIK3-C Rev. A
6.4
System
parameters
6.4.1
Presentation of Measuring Values as Primary Quantities on
the Display (Iprim Phase)
This parameter makes it possible to present the indications of phase current and earth-fault current
separately, i.e. as primary or secondary measuring value. Currents in the kiloampere range are in-
dicated with the symbol of unit of measurement k (kilo) as three-digit point.
Example:
A 1500/5 A CT is used with a primary current of 1380 A. The parameter for the CT primary current
is given in kilo Ampere.
The parameter is set to ”1.50“ (kA). Then ”1K38“ is displayed as I-measurement.
If the setting is set to ”sec.“, ”0.92“ x I
N
. is displayed as I-measurement.
Note:
The settings for the pick-up value are adjusted to a multiple of the secondary rated CT current.
The settings for phase and earth current transformers can be done separately.
6.4.2
Display of residual voltage UE as primary quantity (Uprim/Usec)
The residual voltage can be shown as primary measuring value. For this parameter the transforma-
tion ratio of the VT has to be set accordingly. If the parameter is set to "SEK", the measuring value
is shown as rated secondary voltage.
Example:
The voltage transformer used is of 10 kV/100 V. The transformation ratio is 100 and this value has
to be set accordingly. If still the rated secondary voltage should be shown, the parameter is to be
set to 1.
6.4.3
Voltage transformer connection for residual voltage measuring
(3pha/e-n/1:1)
Depending on the connection of the voltage transformer of ER/XR-relay types three possibilities of
the residual voltage measurement can be chosen (see 5.6).
6.4.4
Operation
cycle
counter
Each switch ON operation increases the counter. It is possible to set the operation cycle counter to
a start value.
