NOVAR 2100/2200 Operating Manual
2.2.1.2 NOVAR 2200
Connect an auxiliary supply voltage in the range as declared in technical specifications table to the
terminals
AV1
(No. 1) and
AV2
( No.2).
In case of DC supply voltage the polarity of connection is generally free, but for maximum
electromagnetic compatibility it is recommended to connect grounded pole to the terminal
AV2
.
The supply voltage must be connected via a disconnecting device ( switch - see installation diagram ).
It must be situated directly at the instrument and must be easily accessible by the operator.
The
disconnecting device must be labelled as the disconnecting device of the equipment.
A two-pole
circuit breaker with the C-type tripping characteristics rated at 1A may be used for the disconnecting
device; however its function and position must be clearly marked (symbols „O" and „I" according to EN
61010 – 1). If one of the supply signals is neutral wire N (or PEN) usually a single breaker in the line
branch is sufficient.
Measuring voltage must be connected to the terminals
L1
(No. 5) and
N/L2
( No.6). Connecting wires
should be protected by, for example, fuses of rating 1A.
A connection cable maximum cross section area is 2.5 mm
2
.
2.2.2 Measuring Current
The instruments are designed for indirect current measurement via external CT only. Signal of any
phase and of any polarity can be used.
To get better precision when using overweighted CTs, you can apply more windings of
measured wire through the transformer. Then you must set the multiplier parameter (in
parameter group 71, see below). For standard connection with 1 winding, the multiplier must
be set to 1.
10
Fig. 2.2: NOVAR 2100
Typical connection of measuring inputs
Fig. 2.3: NOVAR 2200
Measuring & power supply inputs connection
example
