Eaton Industrial Switchgear - xStart switching, protections and actuating motors

280 / 439

7/88 DC string circuit-breakers, DC switch-disconnectors
Characteristic curves
2010 CA08103002Z-EN
Characteristiccurves
Characteristic curve set value -
short-circuit current
As specified in the IEC 62548-1 draft for
the protection of photovoltaic modules,
the tripping current of the circuit-
breaker must lie between 1.4 and 2
times the value of the photovoltaic
module‘s short-circuit current.
Since only the current values of the
installed overload release can be
plotted on the setting scale for the
circuit-breaker 1), the correlation
between the protective device‘s
tripping current and the photovoltaic
module‘s short-circuit current must be
specified for each point of the scale in
a suitable form.
1) Standard IEC/EN 60947-2 (Section
4.7.3) prohibits directly specifying the
photovoltaic short-circuit current on
the circuit-breaker's setting scale,
meaning that only the current set value
of the operating current can be plotted
there.
Tripping characteristics
Tripping characteristics
DC string circuit-breaker PKZ-SOL
10 1
0.001
0.01
0.1
10.000
1.000
100
10
1
100
x Ir
1 h
2 h
(1 min)
t [s]
Setting aid for string circuit-breaker PKZ-SOL
Set value on circuit-breaker [A]
Short-circuit current in solar module [A]
0 5 10 15 20 25 30 35 40 50
0
10
20
30
40
50
60
70
45
PKZ-SOL60
PKZ-SOL50
PKZ-SOL40
PKZ-SOL30
PKZ-SOL20
PKZ-SOL12
PKZ-SOL7
PKZ-SOL4
I r
[A] ISC...