14
TB MRF3 04.01 E
5.2
Setting procedure
Before changing a parameter a password has to be
entered first (see chapter 4.4 of description "
MR
-digital
multifunctional relay)
The parameter setting procedure is guided by two-
colored illuminated LEDs. During setting of the fre-
quency setting values f
N
, f
1
- f
4
, f
e
, df
1
and df
2
the LEDs
light up green. During setting of the tripping delays,
differential periods or counters these LEDs light up red.
The desired pickup values, nominal values and trip-
ping delays can be adjusted by pressing push buttons
<+> and <-> and stored with <ENTER>.
5.3
System parameter
5.3.1
Display voltage U as primary quan-
tity (U
prim
/U
sek
)
The 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 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.
5.3.2
Setting of nominal frequency
For proper functioning it is necessary to first adjust the
rated frequency (50 or 60 Hz).
First the nominal frequency (50 or 60 Hz) has to be
set before unit
MRF3
is put into operation.
All frequency functions are determined by setting the
nominal frequency, i.e. whether the set frequency
thresholds are evaluated as over- or underfrequency
(see also chapter 5.2.3). Also the cycle duration
(20 ms at 50 Hz and 16.67 ms at 60 Hz) derives
from this setting which determines the minimum tripping
delay for frequency elements f
1
- f
4
with an adjustable
multiplier (see also chapter 5.4.4).
During setting of the nominal frequency a value in Hz
is shown on the display.
5.3.3
Display of the activation storage
(FLSH/NOFL)
If after an activation the existing current drops again
below the pickup value, e.g. f1, without a trip has
been initiated, LED f1 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.
5.4
Protection parameters
5.4.1
Parameter switch
By means of a change over facility, two different pa-
rameter sets can be activated. This change over pro-
cedure can be realized either over touch panel by
software or by using the external inputs RESET or
BLOCKING:
Software-
parameter
Blocking input
used as
RESET input
used as
SET1
Blocking input
RESET input
SET2
Blocking input
RESET input
B_S2
Parameter switch
RESET input
R_S2
Blocking input
Parameter switch
B_FR
Trigger off the fault
recorder from ex-
ternal
Reset input
R_FR
Blocking input
Trigger off the fault
recorder from ex-
ternal
S2_FR
Parameter switch
Trigger off the fault
recorder from ex-
ternal
For settings SET1 or SET 2 the parameter set is acti-
vated by software. Terminals C8/D8 and D8/E8 can
then be used as external RESET or BLOCKING inputs.
At setting B_S2 the BLOCKING input (D8/E8) can be
used as parameter set change-over switch. At setting
R_S2 the RESET input (D8/E8) can be used as pa-
rameter set change-over switch. At setting B_FR imme-
diate activation of the fault recorder by using the
BLOCKING input. During the recording time the LED
"FR" lights up at the front plate.
Setting R_FR is used for activating the fault recorder via
the RESET input. At setting S2_FR the parameter set 2
can be activated via the BLOCKING input and/or via
the RESET input recording of a fault event can be acti-
vated.
Содержание MRF3
Страница 1: ...MRF3 Frequency Relay...
