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4.1
General
4.1.1
Analog Inputs
Nominal frequency
Current Inputs
Nominal current
Power Consumption per Phase and Earth Path
- at I
= 1 A
N
- at I
= 5 A
N
- for sensitive earth fault detection at 1A
Current Overload Capability per Current Input
- thermal (rms)
- dynamic (pulse current)
Current Overload Capability for Sensitive Earth Current Input
- thermal (rms)
- dynamic (pulse current)
Current transformer requirements
1st condition:
For a maximum fault current the current transformers must not be
saturated under
steady-state conditions
2nd condition:
The operational accuracy limit factor n' must be at least 30 or a
non-saturated period t'
of at least
AL
must be ensured
3 rd Condition:
Maximum ratio between primary currents of current transformers at
the ends of the protected object
Voltage inputs
Nominal voltage U
N
Measuring range
Power consumption per phase
Voltage overload capability per phase
- thermal (rms)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
f
N
I
Nom
1
/
AC cycle after fault inception
4
At 100 V
50 Hz or 60 Hz (adjustable)
1 A or 5 A
Approx. 0.05 VA
Approx. 0.3 VA
Approx. 0.05 VA
500 A for 1 s
150 A for 10 s
4 · I
continuous
N
1,250 A (half-cycle)
300 A for 1 s
100 A for 10 s
15 A continuous
750 A (half-cycle)
n' ≥ 30
or
1
t'
/
cycle
≥
AL
4
80 V to 125 V (adjustable)
0 V to 218.5 V (rms)
≤ 0.1 VA
230 V continuous
Technical Data
4.1 General
571
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