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745
Transformer Management Relay
! HARMONIC
INHIBIT
5–44
1.
PERCENT DIFFERENTIAL SLOPE 2
2.
The source is connected to one winding only.
Therefore, the
PERCENT DIFFERENTIAL SLOPE 2
increase dependability, the Slope 2 settings should be less than 98%
FIGURE 5–8: Percent Differential Scheme Logic
c) Harmonic Inhibit
PATH: SETPOINTS
!"
S4 ELEMENTS
[!]
HARMONIC INHIBIT
FUNCTION: Enabled
HARMONIC INHIBIT
MESSAGE
PARAMETERS: 2nd
HARMONIC AVERAGING:
MESSAGE
Disabled
HARMONIC INHIBIT
MESSAGE
LEVEL: 20.0% f0
This menu contains the percent differential harmonic inhibit settings. This is the
percent differential element in a particular phase if the 2
phase exceeds the
HARMONIC INHIBIT LEVEL
parameters set to "2nd + 5th", the RMS sum of the 2
components is compared against the level setting. With harmonic averaging
enabled, all three phases are inhibited if the 3-phase average of the harmonics
exceeds the level setting
•
HARMONIC INHIBIT PARAMETERS: Select "2nd" to compare only the 2
harmonic current against the
nd
the RMS sum of the 2
nd
the 2
harmonic current alone will exceed 20% during energization and the
"2nd" value is sufficient to inhibit the differential element for inrush current.
http://www.GEindustrial.com/multilin
is set above 100%.
value cannot be greater than 100%. To
!"
DIFFERENTIAL
!"
HARMONIC INHIBIT
Range: Enabled, Disabled
Range: 2nd, 2nd + 5th
Range: Enabled, Disabled
Range: 0.1 to 65.0% f
setpoint. With harmonic inhibit
HARMONIC INHIBIT LEVEL
th
and 5
harmonic components. For most transformers,
S4 Elements
in steps of 0.1
0
nd
harmonic of the same
nd
th
and 5
harmonic
nd
. Select "2nd + 5th" to use
GE Multilin
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