GE D30

CHAPTER 5: SETTINGS GROUPED ELEMENTS
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 5-199
5
Figure 5-105: Applications of the PH DIST XFMR VOL/CUR CONNECTION settings
PHS DIST Z1 REACH — This setting defines the zone reach for the forward and reverse applications. In the non-directional
applications, this setting defines the forward reach of the zone. The reverse reach impedance in non-directional
applications is set independently. The reach impedance is entered in secondary ohms. The reach impedance angle is
entered as the
PHS DIST Z1 RCA setting.
To achieve specified operating speed of distance elements, the relay internally calculates source to line impedance ratio
(SIR) from fault phasors. In these calculations, line impedance is estimated based on the zone 1 reach setting. Therefore, in
order to calculate the SIR value properly and to maintain the optimal operating speed of the distance elements, set zone 1
reach with a regular 80 to 85% of the line impedance reach setting, even when zone 1 is disabled.
PHS DIST Z1 RCA — This setting specifies the characteristic angle (similar to the "maximum torque angle" in previous
technologies) of the phase distance characteristic for the forward and reverse applications. In the non-directional
applications, this setting defines the angle of the forward reach impedance. The reverse reach impedance in the non-
directional applications is set independently. The setting is an angle of reach impedance as shown in the distance
characteristic figures earlier. This setting is independent from
PHS DIST Z1 DIR RCA, the characteristic angle of an extra
directional supervising function.
PHS DIST Z1 REV REACH — This setting defines the reverse reach of the non-directional zone (PHS DIST Z1 DIR setting). The
value must be entered in secondary ohms. This setting does not apply when the zone direction is set to "Forward" or
"Reverse."
PHS DIST Z1 REV REACH RCA — This setting defines the angle of the reverse reach impedance of the non-directional zone
(PHS DIST Z1 DIR setting). This setting does not apply when the zone direction is set to "Forward" or "Reverse."