ABB RED615 Technical Manual page 281

1YHT530004D05 D
615 series
Technical Manual
the polarizing quantity is compared to the set Voltage start value. If both limits are
exceeded, the level detector sends an enabling signal to the timer module. When
the Enable voltage limit setting is set to "False", Voltage start value has no effect
and the level detection is purely based on the operating quantity. If the ENA_MULT
input is active, the Start value setting is multiplied by the Start value Mult setting.
If the Enable voltage limit setting is set to "True", the magnitude of
the polarizing quantity is checked even if the Directional mode was
set to "Non-directional" or Allow Non Dir to "True". The IED does
not accept the Start value or Start value Mult setting if the product
of these settings exceeds the Start value setting range.
Typically, the ENA_MULT input is connected to the inrush detection function
INRHPAR. In case of inrush, INRPHAR activates the ENA_MULT input, which
multiplies Start value by the Start value Mult setting.
Directional calculation
The directional calculation module monitors the angle between the polarizing
quantity and operating quantity. Depending on the Pol signal Sel setting, the
polarizing quantity can be the residual voltage (measured or calculated) or the
negative sequence voltage. When the angle is in the operation sector, the module
sends the enabling signal to the timer module.
The minimum signal level which allows the directional operation can be set with
the Min operate current and Min operate voltage settings.
If Pol signal Sel is set to "Measured Uo" or "Calculated Uo", the residual current
and residual voltage are used for directional calculation.
If Pol signal Sel is set to "Neg. seq. volt", the negative sequence current and
negative sequence voltage are used for directional calculation.
In the phasor diagrams representing the operation of DEFxPDEF, the polarity of
the polarizing quantity (Uo or U2) is reversed, that is, the polarizing quantity in the
phasor diagrams is either -Uo or -U2. Reversing is done by switching the polarity
of the residual current measuring channel (see the connection diagram in the
application manual). Similarly the polarity of the calculated Io and I
For defining the operation sector, there are five modes available through the
Operation mode setting.
Section 4
Protection functions
is also switched.
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