Power Swing Menu - Siemens 7SG164 Ohmega 400 Series Manual

Z4 PF Time Delay
An independent time delay from 0 – 10s can be applied to the Zone 4 phase-fault protection elements.
Z4 Earth Fault
Operation of the Zone 4 earth-fault elements A-E, B-E & C-E, can be disabled from this setting.
Z4 EF Impedance
Defines the Zone 4 earth-fault impedance reach (in terms of secondary positive sequence impedance) for the
mho characteristic.
Z4 EF Time Delay
An independent time delay from 0 – 10s can be applied to the Zone 4 earth-fault protection elements.

2.3 Power Swing Menu

Settings for the power swing element are defined in this section.
Power Swing Detector
This setting allows the Power Swing detector to be enabled or disabled.
PSD Zone blocking
This defines which Zones of protection tripping would be blocked for in the event of a Power Swing.
PSD Shape
Allows setting of the Power Swing Zone characteristics as either circular or rectangular.
PSD Blinders
This allows blinders to be applied to the Power Swing Zone to prevent load encroachment. These are applied
parallel to the line angle when enabled.
PSD Inner Fwd Impedance
Sets the inner impedance reach in the forward direction (on the line angle) for the PSD characteristic. This is
usually set equal to, or greater than, the Zone 3 reach.
PSD Inner Rev Impedance
Sets the inner impedance reach in the reverse direction (on the line angle) for the PSD characteristic. This is
usually set equal to, or greater than, the Zone 3 reverse reach.
PSD Inner Fwd Blinder
This is the impedance (perpendicular to the line angle) between the line impedance and the blinder applied to the
PSD Zone, to the right of the line characteristic. The blinder is applied parallel to the line angle.
PSD Inner Rev Blinder
This is the impedance (perpendicular to the line angle) between the line impedance and the blinder applied to the
PSD Zone, to the left of the characteristic. The blinder is applied parallel to the line angle.
PSD Outer Multiplier
The outer reach of the Power Swing detector is set as a multiple of the inner reach, normally 1.5 times the inner
reach.
PSD Transit Time
This is the length of time for which the impedance characteristic must be between the inner and outer Zones of
the Power Swing Detector for a Power Swing to be detected. The default setting of 50ms should be suitable for
most applications.
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(0..10000)
(Disabled..Enabled)
(0.1..250)
(0..10000)
(DISABLE..ENABLE)
(4 Bit Binary)
(CIRCULAR..RECTANGULAR)
(DISABLE..ENABLE)
(0.1..250)
(0.1..250)
(0.1..250) 16
(0.1..250) 16
(1.05..2) 1.5
(0..1000)
7SG1641 Ohmega 402 60 Relay Settings
0 ms
Enabled
8 ohms
0 ms
ENABLE
-111
CIRCULAR
DISABLE
24 ohms
8 ohms
ohms
ohms
x
50 ms
Chapter 4 Page 12 of 20