TB MRI3-ITE(R) 12.00 E
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5.2
Setting procedure
After push button <SELECT/RESET> has been pressed,
always the next measuring value is indicated. 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. Before parameter setting can be started the
relevant password must be entered (refer to Chapter
4.4 of the "MR Digital Multifunctional Relay" Descrip-
tion).
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 indica-
tion as primary measuring value. For this purpose the
parameter must be set to be equal with the rated pri-
mary 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 sec-
ondary 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 U
E
as primary quantity (U
prim
/U
sec
)
The residual voltage can be shown as primary measur-
ing value. For this parameter the transformation ratio of
the VT has to be set accordingly. If the parameter is set
to "sec", the measuring value is shown as rated secon-
dary 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 chaper 4.6).
5.3.5
Nominal frequency
The adapted FFT-algorithm requires the nominal fre-
quency as a parameter for correct digital sampling
and filtering of the input currents.
By pressing <SELECT> the display shows "f=50" or
"f=60". The desired nominal frequency can be ad-
justed by <+> or <-> and then stored with <ENTER>.
5.3.6
Display of the activation storage
(FLSH/NOFL)
If after an activation the existing current drops again
below the pickup value, e.g. I>, without a trip has
been initiated, LED I> signals that an activation has
occured by flashing fast. The LED keeps flashing until it
is reset again (push button <RESET>). Flashing can be
suppressed when the parameter is set to NOFL.
