ABB Relion REC670 Applications Manual page 336

Section 13
Control
P>
IEC06000634 V2 EN-US
Figure 164: Setting of a negative value for P>
P< : When the active power falls below the value given by this setting, the output PLTREV will be
activated after the time delay
which effectively means that, for example a positive value of
than a value in the forward direction. This is shown in figure
means pickup for all values to the left of the setting. Reference is made to figure
definition of forward and reverse direction of power through the transformer.
IEC06000635 V2 EN-US
Figure 165: Setting of a positive value for P<
Q> : When the reactive power exceeds the value given by this setting, the output QGTFWD will
be activated after the time delay
which effectively means that the function picks up for all values of reactive power greater than
the set value, similar to the functionality for
Q< : When the reactive power falls below the value given by this setting, the output QLTREV will
be activated after the time delay
which effectively means that the function picks up for all values of reactive power less than the
set value, similar to the functionality for
tPower : Time delay for activation of the power monitoring output signals (PGTFWD, PLTREV,
QGTFWD and QLTREV).
Parallel control (ParCtrl)
OperationPAR : Setting of the method for parallel operation.
OperCCBlock : This setting enables/disables blocking if the circulating current exceeds
CircCurrLimit .
CircCurrLimit : Pick up value for the circulating current blocking function. The setting is made in
percent of
tCircCurr : Time delay for the circulating current blocking function.
Comp : When parallel operation with the circulating current method is used, this setting
increases or decreases the influence of the circulating current on the regulation.
If the transformers are connected to the same bus on the HV- as well as the LV-side,
be calculated with the following formula which is valid for any number of two-winding
transformers in parallel, irrespective if the transformers are of different size and short circuit
impedance.
330
P
en06000634_2_en.vsd
tPower . It shall be noticed that the setting is given with sign,
P
P<
en06000635_2_en.vsd
tPower . It shall be noticed that the setting is given with sign,
tPower . It shall be noticed that the setting is given with sign,
I2Base .
P< means an active power less
165
P> .
P< .
1MRK 511 358-UEN A
where a positive value of
159 for
Comp can
Application manual
P<