Table of Contents
Advertisement
Functions
2.30 100-%-Stator Earth Fault Protection with 3rd Harmonics (ANSI 27/59TN 3rd Harm.)
Operating Range
Due to the strong dependency of the measurable 3rd harmonic 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
U
>
1 min
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
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 >
5207
U0 3.H.(V/100%)
2.30.4
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
222
40 % P/S
N Gen
80 % U
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
-40.0 .. 40.0
Type of In-
formation
SP
OUT
OUT
OUT
OUT
OUT
Default Setting
OFF
Stator Earth Fault Protection
3rdHarm.
1.0 V
U0 3rd Harmonic< Pickup
2.0 V
U0 3rd Harmonic> Pickup
0.50 sec
T SEF 3rd Harmonic Time Delay
40 %
Release Threshold Pmin>
80.0 V
Release Threshold U1min>
0.0
Correction Factor for Pickup
(V/100%)
Comments
>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
C53000-G1176-C149-7, Release date 03.2010
Comments
SIPROTEC, 7UM62, Manual
Advertisement
Table of Contents
