GD9924BE ABB distributed control system industrial DCS module card

Description

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Measurement functions
The PR123 trip unit provides a complete set of measurements:
– Currents: three phases (L1, L2, L3), neutral (Ne) and earth fault :
– Voltage: phase-phase, phase-neutral and residual voltage
– Power: active, reactive and apparent
– Power factor
– Frequency and peak factor,
– Energy: active, reactive, apparent, counter
– Harmonics calculation: up to the 40th harmonic (waveform and module of the harmonics displayed); up to the 35th for frequency f = 60Hz
– Maintenance: number of operations, percentage of contact wear, opening data storage
– cosϕ: phase sequence (only alarm).
The PR123 unit is able to provide the pattern of measurements for some values over an adjustable period of time P, such as: mean active power, maximum active power, maximum current,
maximum voltage and minimum voltage. The last 24 P periods (adjustable from 5 to 120 min.)
are stored in a non-volatile memory and displayed in a bar graph.
Other Functions
PR123/P integrates all the features (in terms of protection, measurement, signaling and communication) described for PR122/P equipped with PR120/V. With PR123/P-LSIG, when the special
rating plug for residual current protection and the external toroid are activate, the earth fault
protection, if selected, can replace Gext protection, while G protection keep on being active.