Satec C192PF8-RPR, Инструкция по установке и эксплуатации, Страница: 52 / 75

Chapter 5 PFC Setup and Operation 47
Shutting the PFC Down
From the PFC setup menu, set the PFC operation mode to OFF. This will put the PFC into
Shut Down mode.
Shut Down mode provides step-by-step disconnection of all the capacitor banks
that are under the PFC control. The banks switch out progressively, following
disconnection intervals (switch-off delays). After all the banks are switched out,
the PFC is put into OFF state.
5.2.2 PFC Setpoints
The PFC can operate in Power Factor Controller (PFC) mode or Reactive Power
Regulator (RPR) mode depending on the target setpoint parameter set for the
PFC.
The PFC can provide power factor or reactive power regulation using one of four
measured values as a target setpoint:
- true power factor;
- fundamental’s power factor (displacement) ;
- true reactive power;
- fundamental’s reactive power.
When automatic operation is enabled, PFC operations are triggered automatically
by the PFC setpoint whenever the measured value is outside the user-defined
setpoint range.
PFC Setpoint Trigger
In order to operate reliably under various harmonic conditions, the PFC allows
you to choose one of the following two calculation methods for the power factor or
kvar trigger:
1. True power factor or true kvar based on the true RMS calculations. It
accounts for harmonics through the 15th, and is recommended for electrical
networks where voltage THD is no more than 5%. For higher levels of
harmonics, the power factor and kvar readings will vary too frequently, which
may result in excess cycling of the capacitors unless you drastically increase
the setpoint operate delay.
2. The power factor displacement or fundamental’s kvar based on the
fundamental harmonic measurements. It does not account for presence of
high harmonics and will give stable results in all conditions regardless of the
present harmonics level.
Operational Setpoints
Two target setpoint ranges can be defined, generally, for day and night operation,
which are switched externally through the instrument digital input. They are
designated as setpoints SP1 and SP2.
Unless you do intend to switch the setpoint ranges, specify the operational
setpoints as SP1. In this event, only the setpoint SP1 will be operational, and the