ABB RELION REX640 Technical Manual page 1441

Protection and control

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1MRS759142 F

Figure 805: Complex power and power quadrants

Table 1361: Power quadrants

The active power P direction can be selected between forward and reverse

be selected with

The accumulated energy is calculated separately as forward active ( EA_FWD_ACM),

reverse active ( EA_RV_ACM), forward reactive ( ER_FWD_ACM) and reverse reactive

( ER_RV_ACM). Depending on the value of the unit multiplier selected with

unit Mult , the calculated power values are presented in units of kWh/kVArh or in

units of MWh/MVArh.

When the energy counter reaches its defined maximum value, the counter value is

reset and restarted from zero. Changing the value of the

resets the accumulated energy values to the initial values, that is, EA_FWD_ACM

Forward Wh Initial , EA_RV_ACM to Reverse Wh Initial , ER_FWD_ACM to Forward

VArh Initial and ER_RV_ACM to Reverse VArh Initial . It is also possible to reset the

accumulated energy to initial values through a parameter or with the RSTACM input.

Sequence components

The phase-sequence components are calculated using the phase currents and phase

voltages. More information on calculating the phase-sequence components can be

Technical Manual

Active power Dir and correspondingly the reactive power Q direction can

Reactive power Dir . This affects also the accumulated energy

Chapter 11.7 Calculated measurements

in this manual.

Measurement functions

Energy unit Mult setting