Line Differential Protection - Siemens SIPROTEC 7SD600 System Manual

3
Technical data
Numerical line differential protection SIPROTEC 7SD600 V3.0
3.3

Line differential protection

Table 3.6 Line differential protection
Setting ranges
Response characteristics
All current values refer to symmetrical current with standard connection.
Operating times
Tolerances with pre-settings
under reference conditions
Influencing variables
Pilot wires
Pilot wire monitoring and
transfer tripping (order option)
3 - 6
System manual
Current threshold I (release with local current)
1
I/I
N line
Differential current
Delay time T
Stabilization with 2nd harmonic
Resetting ratio
Pick-up time for two-sided infeed
with 4 x setting value
Reset time
Local current threshold
Differential current
Auxiliary supply voltage in range
0.8
Temperature in range 0 _C
Frequency in range 0.9
Number
Asymmetry of pilot wire pair at 800 Hz
Maximum loop resistance
Permissible induced longitudinal voltages
for direct connection with pilot wire
for connection via isolating transformer
Monitoring signal
Delay of fail signal
Operating time of transfer tripping
Prologation of transfer trip signal
Order no. E50417-G1176-C069-A1
0.00 to 1.50 (step 0.01)
I/I 0.05 to 2.50 (step 0.01)
N line
0.00 to 60.00 s (step 0.01 s)
see Figure 3.1
I /I 10 to 80 %
2fN fN
approx. 0.7 @ pick-up value (I
approx. 20 to 28 ms without stabilization by
approx. 32 to 42 ms with stabilization by
approx. 35 ms
3 % of set value, min 0.02 @ I
"
5 % of set value, min 0.02 @ I
"
1 %
v
U /U @1.15
v HN v
H
1 %/10K
v
Q 40 _C
v amb v
4 %
v
f/f 1.1
v N v
2
preferably symmetrical telephone wire pairs
with 73 W/km loop resistance and 60 nF/km
capacitance
-3
max. 10
1200 W
1.2 kV, but max. 60 % of the test voltage of
v
the pilot wires
1.2 kV, but max. 60 % of the test voltage of
w
the pilot wires and max. 60 % of the test vol
tage of the isolating transformer
2000 Hz, pulse code modulation
1 to 60 s (step 1 s)
approx. 65 ms
0.00 to 5.00 s (step 0.01 s)
= 0)
stab
2 harm
2 harm
N
N
Siemens AG January 1999