Manual MRI3-ITER GB
Woodward
DOK-TD-MRI3 ITERE Rev.A
27
5.2 Setting
procedure
After push button <SELECT/RESET> has been pressed, always the next measuring value is indi-
cated. Firstly the operating measuring values are indicated and then the setting parameters.
By pressing the <ENTER> push button the setting values can directly be called up and changed.
Be-fore parameter setting can be started the relevant password must be entered (refer to Chapter
4.4 of the "MR Digital Multifunctional Relay" Description).
5.3 System
parameter
5.3.1 Display of measuring values as primary quantities (I
prim
phase)
With this parameter it is possible to show the indication as primary measuring value. For this
purpose the parameter must be set to be equal with the rated primary CT current. If the parameter
is set to "sec", the measuring value is shown as a multiple of the rated secondary CT current.
Example:
The current transformer used is of 1500/5 A. The flowing current is 1380 A. The parameter is set to
1500 A and on the display "1380 A" are shown. If the parameter is set to "sec", the value shown on
the display is "0.92" x In.
Note:
The pick-up value is set to a multiple of the rated secondary CT current.
5.3.2 Display of earth current as primary quantity (I
prim
earth)
The parameter of this function is to be set in the same way as that described under 5.3.1.
5.3.3 Display of residual voltage UE as primary quantity (U
prim
/U
sec
)
The residual voltage can be shown as primary measuring value. For this parameter the
transformation ratio of the VT has to be set accordingly. If the parameter is set to "sec", the mea-
suring 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.
5.3.4 Voltage transformer connection for residual voltage measuring
(3pha/e-n/1:1)
Depending on the connection of the voltage trans-former of ER/XR-relay types three possibilities of
the residual voltage measurement can be chosen (see chapter 4.6).
