Reference Manual
BLR-CM/BLR-CM3phase
Rev. 08
2018-09
5
1 Installation and Connection
Only qualified staff is allowed to perform the installation. All legal rules have to be observed and technical
standards have to be met. Before connecting the device check that all connecting leads are de-energized and
that current transformers are bypassed.
1)
Compare auxiliary-, measurement-, control voltage, frequency and the current path of the device (see
type label) with the data of the electricity network.
2)
Assemble the relay in the switch panel with the 2 mounting clips. If the device is not fitting in the
cutout the small plastic bars on the side of the case can be removed with a knife.
3)
Connect protective ground to the terminal link of the case.
4)
Connect in accordance to the wiring diagram (see chapter "connection"). Pay special attention to the
cross section size of the CT connections! An integrated voltage observation with regard to the auxiliary
voltage in BLR-CM guarantees a safety disconnection of the capacitors in case of undervoltage. It must
be ensured, that auxiliary voltage is taken from the identical phase as control voltage for the contac-
tors, to guarantee that all switching elements are safely switched off in case of under voltage.
5)
Remove short circuit links of the current transformer before commissioning!
1.1 Auxiliary voltage
At BLR-CM auxiliary voltage has to be connected separately from measuring voltage. The terminals for auxiliary voltage
are marked with La, Lb and 0.
Terminal 0 has to be connected always. La and Lb are different tapping points of the transformer to allow the usage
with different voltage levels. The detailed connection depends on the device type and can be seen on the sticker at the
rear side of the regulator.
1.2 Current measurement
BLR-CM can be used in combination with x/5Amp current transformer as well as with x/1Amp types. The terminals for
CT connection are marked with K (S1) and L (S2). CT has to be mounted in the way, that K (P1) connected to the feeder
from utility and L (P2) is connected to load.
Current measuring is necessary for calculation of control deviation and capacitors sizes for reactive power regulation as
well as for showing and monitoring different measuring values.
BLR-CM can be used with summation transformer as well. To get proper function, please pay attention to correct po-
larity of all CTs and to the correct setting of CT-factor. The CT-factor for a summation transformer can easily be calcu-
lated by adding the single transformer ratios (e. g. 1000A/5A + 1000A/5A + 1000A/5A = 200 + 200 + 200 = CT-factor
600).
At BLR-CM3phase (option -3A) please take care that the current inputs are connected to the correct phases
in clockwise rotary field.
!
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