ABB REF 542plus, Руководство оператора, Страница: 31 / 134

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9. Viewing measurements
REF 542plus offers complete measurements set to the user. To view the
measurements, select the measurement menu with the navigation button. Use the UP
and DOWN buttons to browse the measurement pages.
The available measurements depend upon the unit configuration. In the maximum
configuration, the following measurements are displayed:
*
IL1, IL2, IL3, in A; line currents, measured values
*
U1E, U2E, U3E, in kV; phase to earth voltages, measured values
*
UL12, UL23, UL31, in kV; phase-to-phase voltages, computed values.
1)
*
IL1 mean, IL2 mean, IL3 mean, in A; mean currents in the observation period,
computed values
*
IL1 max, IL2 max, IL3 max, in A; maximum peak currents in the observation
period, computed values
*
Frequency, in Hz; measured values
*
Active power, in kW; reactive power in kVAr, apparent power in kVA, computed
values
*
Power factor, computed value
*
Active energy in MWh, reactive energy in Mvarh; computed values
*
Operating hours, in hours. This is the total working hours of the unit
*
Switch cycle, number the circuit breaker close-open cycles
*
Added switched current, in kA; sum of the interrupted currents by the circuit
breaker
*
THD (total harmonic distortion)
The observation period is set with the Operating Tool. It can be from 0
minutes up to 30 minutes. If the observation period is set to 0, the
corresponding measurements are disabled.
The refresh time for the displayed measurements is about half second.
Multifunction Protection and Switchgear Control Unit
Operator's manual
REF 542plus REF 542plus
1MRS755869
1)
REF 542plus can also use phase-to-phase voltage transformers. When used,
phase-to-phase voltages are measured and phase to earth voltages are computed.