ABB RELION REX640 Technical Manual page 1083

Protection and control

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1MRS759142 F

There are two general applications which can best utilize under power factor

protection; power-factor control and loss of excitation.

When applying the function for power-factor control, both the start value and the

start reset value should be the same sign (positive/negative) as well as the same

direction (leading/lagging). Additionally, the absolute value of the start reset value

should be greater than or equal to the absolute value of the start value. This allows

the function to properly control any power factor controls within the system.

When applying the function for loss of excitation, both the start value and the start

reset value should be the same sign (positive/negative), but the directions should

be different (leading/lagging). This application is well-suited to protect against

back-spinning. In this case the start reset value will only come into play once the

system provides power in the opposite quadrant of the start value, for example,

lagging PF turns to leading PF.

MPUPF Input signals

Table 1020: MPUPF Input signals

MPUPF Output signals

Table 1021: MPUPF Output signals

MPUPF Settings

Table 1022: MPUPF Group settings (Basic)

Values (Range)

Start value Dir

Table continues on the next page

Technical Manual

Protection functions

Three-phase currents

Three-phase voltages

Block signal for acti-

vating the blocking

Signal to block the

function during ma-

chine startup

PF direction for