Directional Overcurrent Characteristics - ABB RELION 620 Series Technical Manual

1MRS757644 F
4.1.4.6
620 series
Technical Manual
Curve name
(9) IEC Normal Inverse
(10) IEC Very Inverse
(11) IEC Inverse
(12) IEC Extremely Inverse
(13) IEC Short Time Inverse
(14) IEC Long Time Inverse
(17) Programmable
:
A detailed description of the timers can be found in the
function block features
Reset curve type Supported by
DPH3LPDOC
(1) Immediate x
(2) Def time reset x
(3) Inverse reset x

Directional overcurrent characteristics

The forward and reverse sectors are defined separately. The forward operation area is
limited with the Min forward angle and Max forward angle settings. The reverse
operation area is limited with the Min reverse angle and Max reverse angle settings.
The sector limits are always given as positive degree values.
In the forward operation area, the Max forward angle setting gives the
counterclockwise sector and the Min forward angle setting gives the corresponding
clockwise sector, measured from the Characteristic angle setting.
In the backward operation area, the Max reverse angle setting gives the
counterclockwise sector and the Min reverse angle setting gives the corresponding
clockwise sector, a measurement from the Characteristic angle setting that has been
rotated 180 degrees.
Relay characteristic angle (RCA) is set positive if the operating current lags the
polarizing quantity and negative if the operating current leads the polarizing quantity.
Supported by
DPH3LPDOC
x
x
x
x
x
x
x
section in this manual.
DPH3HPDOC
x
x
x
Section 4
Protection functions
DPH3HPDOC
x
x
x
x
General
Note
Available for all
operating time curves
Available for all
operating time curves
Available only for ANSI
and programmable
curves
291