Functions
2.30 100-%-Stator Earth Fault Protection with 3rd Harmonics (ANSI 27/59TN 3rd Harm.)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
222
Operating Range
Due to the strong dependency of the measurable 3rd harmonic from the corresponding working point of the
generator, the working area of the 100–%–stator earth fault protection is only tripped above the active-power
threshold set via 5205 P min > and on exceeding a minimum positive phase-sequence voltage 5206 U1 min
>.
Recommended setting:
P
min
> 40 % P/S
NGen
U
1 min
> 80 % U
N
Time Delay
The tripping in case of an earth fault is delayed by the time set at address 5204 T SEF 3. HARM.. The set
time is an additional time delay not including the operating time of the protective function.
2.30.3 Settings
2.30.4 Information List
Addr. Parameter Setting Options Default Setting Comments
5201 SEF 3rd HARM. OFF
ON
Block relay
OFF Stator Earth Fault Protection
3rdHarm.
5202 U0 3.HARM< 0.2 .. 40.0 V 1.0 V U0 3rd Harmonic< Pickup
5203 U0 3.HARM> 0.2 .. 40.0 V 2.0 V U0 3rd Harmonic> Pickup
5204 T SEF 3. HARM. 0.00 .. 60.00 sec; ∞ 0.50 sec T SEF 3rd Harmonic Time Delay
5205 P min > 10 .. 100 %; 0 40 % Release Threshold Pmin>
5206 U1 min > 50.0 .. 125.0 V; 0 80.0 V Release Threshold U1min>
5207 U0 3.H.(V/100%) -40.0 .. 40.0 0.0 Correction Factor for Pickup
(V/100%)
No. Information Type of In-
formation
Comments
5553 >SEF 3H BLOCK SP >BLOCK SEF with 3.Harmonic
5561 SEF 3H OFF OUT SEF with 3.Harm. is switched OFF
5562 SEF 3H BLOCK OUT SEF with 3.Harm. is BLOCKED
5563 SEF 3H ACTIVE OUT SEF with 3.Harm. is ACTIVE
5567 SEF 3H pick.up OUT SEF with 3.Harm. picked up
5568 SEF 3H TRIP OUT SEF with 3.Harm. TRIP
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