GE D90 Plus Instruction Manual page 226

GROUPED PROTECTION ELEMENTS
216
Quadrilateral Forward Outer
Range: 0.10 to 500.00 ohms in steps of 0.01
Default: 70.00 ohms
This setting specifies the forward reach of the outer quadrilateral characteristic. The
angle of this reach impedance is specified by the
used if the shape setting is "Mho."
Forward RCA
Range: 40 to 90° in steps of 1
Default: 85°
This setting specifies the angle of the forward reach impedance for the mho
characteristics, angles of all blinders, and both forward and reverse reach impedances
of the quadrilateral characteristics.
Reverse Reach
Range: 0.10 to 500.00 ohms in steps of 0.01
Default: 1.00 ohms
This setting specifies the reverse reach of all three mho characteristics and the inner
quadrilateral characteristic. For a simple system of a line and two equivalent sources,
this reach needs to be higher than the positive-sequence impedance of the local source.
Detailed transient stability studies can be needed for complex systems to determine this
setting. The angle of this reach impedance is specified by the
"Mho," and the
Forward RCA
Quadrilateral Reverse Middle
Range: 0.10 to 500.00 ohms in steps of 0.01
Default: 60.00 ohms
This setting specifies the reverse reach of the middle quadrilateral characteristic. The
angle of this reach impedance is specified by the
used if the shape setting is "Mho."
Quadrilateral Reverse Outer
Range: 0.10 to 500.00 ohms in steps of 0.01
Default: 70.00 ohms
This setting specifies the reverse reach of the outer quadrilateral characteristic. The
angle of this reach impedance is specified by the
used if the shape setting is "Mho."
Reverse RCA
Range: 40 to 90° in steps of 1
Default: 85°
This setting specifies the angle of the reverse reach impedance for the mho
characteristics. This setting applies to mho shapes only.
Outer Limit Angle
Range: 40 to 140° in steps of 1
Default: 120°
This setting specifies the outer power swing characteristic. The convention depicted in
the power swing detect mho operating characteristic diagram are to be observed:
values greater than 90° result in an apple-shaped characteristic; values less than 90°
result in a lens shaped characteristic. This angle must be selected in consideration of the
maximum expected load. If the maximum load angle is known, coordinate the outer
limit angle with a 20° security margin. Detailed studies can be needed for complex
systems to determine this setting. This setting applies to mho shapes only.
Forward RCA
setting for inner "Quad."
Forward RCA
Forward RCA
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
setting. The setting is not
setting for
Reverse RCA
setting. The setting is not
setting. The setting is not