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Circuit Breaker Maintenance
A circuit breaker operations counters is provided.
A summation of I
broken by the circuit breaker provides a
2
measure of the contact erosion.
Operations count and I
alarm levels can be set which, when
2
reached, can be used as an input to a condition-based mainte-
nance regime.
Directional Control
7SG112n (Argus 2) and 7SG116n (Argus 6) only.
Directional elements are available as an ordering option.
The bi-directional elements provide independent settings for
each direction of each overcurrent stage. Single phase or two-
out-of-three directional decisions are available for the phase-
fault elements. On some models the characteristic angle for
phase-fault and earth-fault are freely selectable, while on oth-
ers they are chosen from +30° and +45° for phase-fault, and
from 0°, -15°, -45° and -65° for earth-fault.
The polarising voltage for phase-fault elements is taken from
the quadrature phase-phase voltage - see the typical connec-
tion diagrams for details.
Cold Load Pickup
7SG114n (Argus 4) and 7SG116n (Argus 6) only.
The relay can apply higher current settings with longer time
delays, after the circuit breaker has been open for a program-
mable time.
When the circuit breaker is closed, these higher settings are
applied for a programmable time, or until the measured cur-
rent has fallen to normal levels.
Auto-Reclose
7SG114n (Argus 4) and 7SG116n (Argus 6) only.
Integrated auto-reclose is available as an ordering option.
The relay incorporates a 5 trip/4 close auto-reclose sequence
that can be initiated by an internal or external signal.
For each type of protection trip – phase-fault, earth-fault, SEF
and external – a separate sequence of instantaneous and de-
layed trips is available. Programmable dead times and reclaim
times with a wide setting range and integrated sequence co-
ordination enable virtually all distribution auto-reclose
schemes to be realised.
Technical Data
For full technical data refer to the Performance
Specification of the Technical Manual.
Inputs and Outputs
Characteristic energising quantity
AC Current/Voltage
1A / 5A
63.5/110V
Siemens Protection Devices Limited
Frequency
50 / 60Hz
Current Inputs: Burdens
5A Phase/Earth
1A Phase/Earth
5A SEF/REF
1A SEF/REF
Phase/Earth Current Inputs: Thermal Withstand
3.0 x In
Continuous
3.5 x In
10 minutes
4.0 x In
5 minutes
5.0 x In
3 minutes
6.0 x In
2 minutes
1A Input
3 Second
57.7A
2 Second
70.7A
1 Second
100A
I Cycle
177A
SEF/REF Current Inputs: Thermal Withstand
Continuous
2.0 x In
10 minutes
3.5 x In
5 minutes
4.0 x In
3 minutes
5.0 x In
2 minutes
6.0 x In
1A Input
3 Second
37.5A
2 Second
46A
1 Second
65A
I Cycle
120A
Voltage Inputs
Burden
Continuous Withstand
DC Auxiliary supply
Rated DC Voltage
24/30/48V
110/220V
Operate State
Quiescent (Typical)
Maximum
Allowable superimposed ac
component
Allowable breaks/dips in
supply (collapse to zero from
nominal voltage)
< 0.2VA
< 0.05VA
< 0.4VA
< 0.2VA
5A Input
230A
282A
400A
618A
5A Input
202A
247A
350A
618A
< 0.1VA at 110V
250V
Operating Range V dc
18 to 60V
88 to 280V
Burden
3 W
10 W
≤ 12% of dc
voltage
≤ 20 ms
4
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