ABB RER620

Section 4 1MAC309294-MB F
Protection functions
106 RER620
Technical Manual
blocked and the timers are reset. the “Block TRIP output” mode, the function operates
normally but the TRIP output is not activated.
4.1.2.5 Measuring modes
The function operates on three alternative measurement modes: “RMS”, “DFT” and
“Peak-to-Peak”. The measurement mode is selected with the Measurement mode setting.
Table 126: Measurement modes supported by 67/51P and 67/50P stages
4.1.2.6 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.
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.
Measurement mode
Supported measurement modes
67/51P and 67/50P-1 67/50P-2
RMS x x
DFT x x
Peak-to-Peak x x
The sector limits are always given as positive degree values.