Siemens SIPROTEC Manual page 129

Acyclic L3 before L1 before L2
Acyclic L1 before L3 before L2
Acyclic L2 before L1 before L3
Acyclic L1 before L2 before L3
Acyclic L3 before L2 before L1
Acyclic L2 before L3 before L1
Cyclic L3 before L1 before L2 before L3
Cyclic L1 before L3 before L2 before L1
All loops are measured
In the eight preference options one earth fault is switched off according to preference scheme; the second fault
remains in the system as a simple earth fault.
The 7SD5 also enables the user to switch off both fault locations of a double earth fault. Set the double earth
fault preference to All loops.
Table 2-10 lists all measured values used for the distance measuring in isolated or resonant-earthed systems.
Table 2-10
Loop pickup
L1-E, L2-E, (L1-L2)
L2-E, L3-E, (L2-L3)
L1-E, L3-E, (L3-L1)
L1-E, L2-E, (L1-L2)
L2-E, L3-E, (L2-L3)
L1-E, L3-E, (L3-L1)
L1-E, L2-E, (L1-L2)
L2-E, L3-E, (L2-L3)
L1-E, L3-E, (L3-L1)
L1-E, L2-E, (L1-L2)
L2-E, L3-E, (L2-L3)
L1-E, L3-E, (L3-L1)
L1-E, L2-E, (L1-L2)
L2-E, L3-E, (L2-L3)
L1-E, L3-E, (L3-L1)
L1-E, L2-E, (L1-L2)
L2-E, L3-E, (L2-L3)
L1-E, L3-E, (L3-L1)
L1-E, L2-E, (L1-L2)
L2-E, L3-E, (L2-L3)
L1-E, L3-E, (L3-L1)
L1-E, L2-E, (L1-L2)
L2-E, L3-E, (L2-L3)
L1-E, L3-E, (L3-L1)
L1-E, L2-E, (L1-L2)
L2-E, L3-E, (L2-L3)
L1-E, L3-E, (L3-L1)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Evaluation of the Measuring Loops for Multi-phase Pickup in the Non-earthed Network
Evaluated loop(s)
L1-E
L3-E
L3-E
L1-E
L3-E
L1-E
L2-E
L2-E
L1-E
L1-E
L2-E
L1-E
L2-E
L3-E
L3-E
L2-E
L2-E
L3-E
L1-E
L2-E
L3-E
L2-E
L3-E
L1-E
L1-E, L2-E
L2-E, L3-E
L3-E; L1-E
L3 (L1) ACYCLIC
L1 (L3) ACYCLIC
L2 (L1) ACYCLIC
L1 (L2) ACYCLIC
L3 (L2) ACYCLIC
L2 (L3) ACYCLIC
L3 (L1) CYCLIC
L1 (L3) CYCLIC
All loops
Setting of parameter 1520
PHASE PREF.2phe = L3 (L1) ACYCLIC
PHASE PREF.2phe = L1 (L3) ACYCLIC
PHASE PREF.2phe = L2 (L1) ACYCLIC
PHASE PREF.2phe = L1 (L2) ACYCLIC
PHASE PREF.2phe = L3 (L2) ACYCLIC
PHASE PREF.2phe = L2 (L3) ACYCLIC
PHASE PREF.2phe = L3 (L1) CYCLIC
PHASE PREF.2phe = L1 (L3) CYCLIC
PHASE PREF.2phe = All loops
Functions
2.5 Distance Protection
129