FPX86-9329-C ABB distributed control system industrial DCS module card

Description

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PR120/V Measurement Module
This optional internal module, installed in PR122 (standard in PR123), allows the trip unit to
measure the phase and neutral voltages and to process them in order to achieve a series of
features, in terms of protection and measurement.
PR120/V does not normally require any external connection or Voltage Transformer, since it is
connected internally to the lower terminals of Emax. When necessary, the connection of voltage
pick-ups can be moved to any other points (i.e. upper terminals), by using the alternative connection located in the terminal box. The module is provided with a sealable switch-disconnector
for the dielectric test. PR120/V is able to energize the PR122 while line voltage input is above
85V. The use of Voltage Transformers is mandatory for rated voltages higher than 690V.
Voltage transformers shall have burdens equal to 10VA and accuracy class 0.5 or better.
Additional Protections with PR120/V:
– UnderVoltage (UV) protection
– Overvoltage (OV) protection
– Residual voltage (RV) protection
– Reverse power (RP) protection
– Underfrequency (UF) protection
– Overfrequency (OF) protection
All the above indicated protections can be excluded, although it is possible to leave only the
alarm active when required.
With the circuit-breaker closed, these protections also operate when the trip unit is selfsupplied. With the circuit-breaker open, they operate when the auxiliary power supply (24V
DC or PR120/V) is present: in this case the trip unit will indicate the “ALARM” status.