VAMP Ltd
Over-, under-, residual voltage and
frequency relay
Technical description
VAMP 135
VM135.EN008 VAMP 24h support phone : +358 (0)20 753 3264
21
3.2. Feeder over- and undervoltage
protection (3Line mode)
Figure 3.2-1. Over- and undervoltage protection of a feeder. The voltage
measurement mode is set to “3Line”
The auxiliary contact of the voltage transformer’s contactor is
connected to the digital input for blocking of the undervoltage
stages. The residual voltage protection is not in use. The
analogue output (mA) can be used as a voltage transducer for
one line voltage to a local analogue meter or a substation.
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