2.23 100-%-Stator Earth Fault Protection with 3rd Harmonics (ANSI 27/59TN 3rd Harm.)
143
7UM61 Manual
C53000-G1176-C127-3
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
min
> 40 % P/S
N
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.
2.23.3 Settings
2.23.4 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>
No. Information Type of In-
formation
Comments
5553 >SEF 3H BLOCK EM >BLOCK SEF with 3.Harmonic
5561 SEF 3H OFF AM SEF with 3.Harm. is switched OFF
5562 SEF 3H BLOCK AM SEF with 3.Harm. is BLOCKED
5563 SEF 3H ACTIVE AM SEF with 3.Harm. is ACTIVE
5567 SEF 3H pick.up AM SEF with 3.Harm.: picked up
5568 SEF 3H TRIP AM SEF with 3.Harm.: TRIP
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