setting. Reference is made to figure 285 for definition of forward and reverse direction
of power through the transformer.
IEC06000635 V2 EN
Figure 291: 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 tPower. It shall be noticed that the
setting is given with sign, which effectively means that the function picks up for all
values of reactive power greater than the set value, similar to the functionality for P>.
Q<: When the reactive power in reverse direction falls below the value given by this
setting, the output QLTREV will be activated after the time delay tPower. It shall be
noticed that the setting is given with sign, which effectively means that the function
picks up for all values of reactive power less than the set value, similar to the
functionality for P<.
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 I2Base.
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,
Comp can 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.
1MRK504116-UUS C Section 3
IED application
695
Application manual
To Next Page
Loading...
