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4.12.1 Circuit Breaker opening and closing commands
The circuit breaker opening and closing commands are implemented. These commands can be
executed from the HMI
commands menu or using the HMI’s specific keypad or from local or remote
communications.
To execute the commands from remote communications it is necessary to execute the Remote
Command, with this action, the Local Control bit is deactivated and the remote actions are allowed.
Please, note that commands executed from HMI commands menu, HMI specific keys or Local
Communication will be always executed, regardless the status of the bit ‘Local Control’.
For the commands to have an effect, they should be assigned to the corresponding outputs. By default,
the "Open circuit breaker" and "Close circuit breaker" bits are assigned to their corresponding outputs
in the "PGC" states group in the ‘STATES’ menu.
4.12.2
‘Openings Number’ counter.
SILG relay has a counter which records the number of openings of circuit breaker.
This counter has associated the setting ‘Maximum number of openings’. When number of openings is
higher than adjusted value the state “Number of openings” is activated and associated event is created
.
The value of this counter can be initialized to any value inside the range, by HMI or by communications,
in case of installing this protection with a circuit breaker which was already working.
4.12.3
‘Accumulated amperes: I
2
t’ counter
There is also an ‘Accumulated amperes’ counter. This counter accumulates broken amperes by circuit
breaker with its openings.
When a circuit breaker opening happens the maximum of primary amperes are detected in any phase.
If detected current is lower than nominal current, nominal current is used to calculate the accumulation.
It is used with “Openings Number” counter, as an estimation of aging of circuit breaker.
As primary amperes are accumulated, is indispensable to set correctly the CT’s ratio of the phases.
Associated with thi
s counter, there is a setting called ‘Maximum accumulated amperes’. When
accumulated amperes are higher than adjusted value, state ‘Accumulated amperes’ is activated and
associated event is created.
The value of this counter can be initialized to any value inside the range, by HMI or by communications,
in case of installing this protection with a circuit breaker which was already working.
4.12.4
Maximum openings in a time frame
As well as counting the number of times the circuit breaker opens, the SIL-G equipment sets up a time
frame and the maximum number of openings allowed during this time. Both parameters can be adjusted.
It works like a time accumulator, to be active it needs to detect openings within the range defined by
these two settings.
When this
number is exceeded, the ‘Openings/Time Alarm’ status is activated, and its corresponding
event is generated. This alarm resets itself, when the corresponding time is exceeded with less trips
than those indicated.
Содержание SIL-A A Series
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Страница 13: ...www fanox com Rev 04 13 112 2 2 2 Case dimensions The dimensions are in mm...
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