CHAPTER 5: SETTINGS GROUPED ELEMENTS
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 5-209
5
Ground directional supervision
A dual (zero-sequence and negative-sequence) memory-polarized directional supervision applied to the ground distance
protection elements has been shown to give good directional integrity. However, a reverse double-line-to-ground fault can
lead to bad operation of the ground element in a sound phase if the zone reach setting is increased to cover high
resistance faults.
Ground distance zones 2 and higher use an additional ground directional supervision to enhance directional integrity. The
element’s directional characteristic angle is used as a maximum torque angle together with a 90° limit angle.
The supervision is biased toward operation in order to avoid compromising the sensitivity of ground distance elements at
low signal levels. Otherwise, the reverse fault condition that generates concern has high polarizing levels so that a correct
reverse fault decision can be reliably made.
Figure 5-114: Ground directional supervision logic
5.7.5 Power swing detect (ANSI 68)
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) POWER SWING DETECT
POWER SWING
DETECT
POWER SWING
FUNCTION: Disabled
Range: Disabled, Enabled
POWER SWING
SOURCE: SRC 1
Range: SRC 1, SRC 2
POWER SWING
SHAPE: Mho Shape
Range: Mho Shape, Quad Shape
POWER SWING
MODE: Two Step
Range: Two Step, Three Step
POWER SWING
SUPV: 0.600 pu
Range: 0.050 to 30.000 pu in steps of 0.001
POWER SW I2 SUPV ENAB:
Off
Range: FlexLogic operand
POWER SWING
I2 SUPV: 0.200 pu
Range: 0.050 to 30.000 pu in steps of 0.001
POWER SWING FWD
REACH: 50.00 Ω
Range: 0.10 to 500.00 ohms in steps of 0.01
POWER SWING QUAD FWD
REACH MID: 60.00 Ω
Range: 0.10 to 500.00 ohms in steps of 0.01
POWER SWING QUAD FWD
REACH OUT: 70.00 Ω
Range: 0.10 to 500.00 ohms in steps of 0.01
POWER SWING FWD
RCA: 75°
Range: 40 to 90° in steps of 1
POWER SWING REV
REACH: 50.00 Ω
Range: 0.10 to 500.00 ohms in steps of 0.01
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