GE LPS-O Instruction Manual page 37

1 PRODUCT DESCRIPTION
OUTER OUTER
61 61
NUMBRCHAR NUMBRCHAR = 2 = 2
MIDDLE MIDDLE
INNER INNER
62 62
64 64
68 68
63 63
Figure 1–10: OUT-OF-STEP TRIPPING LOGIC DIAGRAM
The discrimination between a fault condition and a system swing is accomplished by checking the time
required for the apparent impedance to move from the load condition (far outside the OUTER characteristic) to
a point within the INNER characteristic. This change occurs immediately for a fault condition, but occurs at a
much slower rate for a swing.
GE Power Management
X
Zf
Zr
Figure 1–9: OST MHO CHARACTERISTIC
TLOS1 TLOS1
A A
61 61
A A
61 61
TLOS2 TLOS2
A A A A
62 62
66 66
62 62
Figure 1-17 Out-of-Step Tripping Logic Diagram Figure 1-17 Out-of-Step Tripping Logic Diagram
LPS-O Line Protection System
1.9 OUT-OF-STEP TRIPPING
Middle
Inner
Outer
R
0 0
A = 1 - 100 ms A = 1 - 100 ms
= 2 = 2
NUMBRCHAR NUMBRCHAR
TLOS3 TLOS3
A A
63 63
0 0
63 63
(REF.) (REF.)
TRIP OUT TRIP OUT
65 65
TRIP IN TRIP IN
OST OST
TLOS4 TLOS4
A A
64 64
0 0
65 65
70 70
1-
23
1