Maintenance; Circuit Breaker Operations - Siemens 7SG11 Manual

Setting name
Demand Window
Maximum Demand Reset
Sub-menu: CB Maintenance.
Setting name
Energy Meter Reset

2.14 Maintenance

This section covers features to assist in the maintenance of circuit breakers, the protection scheme and the Argus
relay itself.

2.14.1 Circuit Breaker Operations

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summation occur for each internal or external trip, as specified by Data Storage:Fault Trigger, see
Trip counts and I
section 2.13.2.
2.14.1.1 Trip Counter
A trip counter is provided which increments on each trip command issued.
A suitable maintenance limit value can be chosen from the circuit breaker manufacturer's data and entered into
the CB Maintenance:Trip Counter Alarm setting. When the alarm setting is exceeded, the output relays mapped by O/P
Relay Config.:Trip Counter Alarm are raised.
The count can be reset using CB Maintenance:Trip Counter Reset, or when viewing the counter's instrument.
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2.14.1.2 Sum of I
Circuit breaker contact wear increases with energy broken, therefore I
maintenance purposes. A suitable maintenance limit value can be chosen from the circuit breaker manufacturer's
data and entered into the CB Maintenance: I2 Alarm setting
The current flowing at the time of trip is added to individual summations for each phase. If any of these exceed
the alarm setting, the output relays mapped by O/P Relay Config.: I2 Alarm are raised. An instrument shows the
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largest I summation of the three phases.
The summation can be reset using CB Maintenance: I2 Reset, or when viewing the summation instrument.
2.14.1.3 Delta Trip Counter
Argus 4 and Argus 6 only
This provides an additional counter, which can be reset independently of the Trip Counter described above. This
can then be used, for example, for recording trip operations between visits to a substation.
Its operation is similar to the Trip Counter above, however a different limit setting (CB Maintenance: Trip Counter
Alarm ) and output (O/P Relay Config.: Trip Alarm) are provided.
The delta trip counter can be reset using CB Maintenance: Trip Counter Reset and when viewing the counter's
instrument, also by a status input mapped by Status Config.: Trip Counter Reset.
2.14.1.4 Frequent Operations Counter
Argus 4 and Argus 6 only
Argus 4 and 6 relays incorporate a Frequent Operations Counter (FOC) which logs the number of trip operations
in each minute-window in a rolling window of one hour. When the total number of trip operations in one hour
reaches or exceeds that set by the user in the CB Maintenance:Freq Op Counter Alarm setting then all protection and
auto-reclose settings are replaced by a Delay (+HS1+HS2 if applicable) characteristic and one trip to lockout
operation. The normally active protection and sequence settings are suspended until the total number of
operations decrements to below the counter setting as the rolling one hour window drops off the high trip count
minute-windows.
©2013 Siemens Protection Devices Limited
Range (bold = default)
5, 10, 15.. 60, 90 .. 300, 360 ..
1440
NO, YES Self-resetting
Range (bold = default)
NO, YES Self-resetting
7SG11 Argus Technical Reference
Units Notes
mins
Yes/No confirmation required
Units Notes
V' applies only to Argus 2 type II.
Yes/No confirmation required
2
summation provides a good estimation for
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