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2.23 100-%-Stator Earth Fault Protection with 3rd Harmonics (ANSI 27/59TN 3rd Harm.)
Operating Range
Due to the strong dependency of the measurable 3rd harmonic on the corresponding
operating point of the generator, the working range of the 100% stator earth fault pro-
tection is only enabled above the active-power threshold set via 5205 P min > and
on transgression of a minimum positive phase-sequence voltage 5206 U1 min >.
Recommended setting:
P
U
The tripping in case of an earth fault is delayed by the time set at address 5204 T SEF
Time Delay
3. HARM.. The set time is an additional time delay not including the operating time of
the protective function.
2.23.3 Settings
Addr.
Parameter
5201
SEF 3rd HARM.
5202
U0 3.HARM<
5203
U0 3.HARM>
5204
T SEF 3. HARM.
5205
P min >
5206
U1 min >
2.23.4 Information List
No.
Information
5553
>SEF 3H BLOCK
5561
SEF 3H OFF
5562
SEF 3H BLOCK
5563
SEF 3H ACTIVE
5567
SEF 3H pick.up
5568
SEF 3H TRIP
7UM61 Manual
C53000-G1176-C127-3
>
40 % P/S
min
>
80 % U
1 min
N
Setting Options
OFF
ON
Block relay
0.2 .. 40.0 V
0.2 .. 40.0 V
0.00 .. 60.00 sec; ∞
10 .. 100 %; 0
50.0 .. 125.0 V; 0
Type of In-
formation
EM
AM
AM
AM
AM
AM
N
Default Setting
OFF
1.0 V
2.0 V
0.50 sec
40 %
80.0 V
>BLOCK SEF with 3.Harmonic
SEF with 3.Harm. is switched OFF
SEF with 3.Harm. is BLOCKED
SEF with 3.Harm. is ACTIVE
SEF with 3.Harm.: picked up
SEF with 3.Harm.: TRIP
Comments
Stator Earth Fault Protection
3rdHarm.
U0 3rd Harmonic< Pickup
U0 3rd Harmonic> Pickup
T SEF 3rd Harmonic Time Delay
Release Threshold Pmin>
Release Threshold U1min>
Comments
143
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