ABB UniGear Series, Engineering Manual

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32 1VLG5 00007 E
Other parameters
The voltage sensor is based on the resistive divider principle. Therefore, the voltage is linear
throughout the whole measuring range. The output signal is a voltage, directly proportional
to the primary voltage. For the voltage sensor all parameters are readable directly from its
rating plate and conversions are not needed.
In this example the system phase-to-phase voltage rating is 10 kV.
Figure 39: Single line diagram
Primary voltage parameter is set to 10 kV. For protection relays with sensor measurement
support the
Voltage input type
is always set to “CVD sensor” and it cannot be changed. The
same applies for the
VT connection
parameter which is always set to “WYE” type. The divi-
sion ratio is 10 000: 1. Thus, the
Division ratio
parameter is set to “10 000”. The primary
voltage is proportionally divided by this division ratio.
Figure 40: Example of setting values for Voltage sensor in PCM600