Circuit breaker closing time measurement, “From Pos to Curr”
“From Pos to Curr” measures the closing time from position change indicated by
auxiliary contacts till current is flowing in the primary circuit.
This operation mode requires that current signal is connected to I3P1
and I3P2 inputs. This mode is recommended only for supervision
purposes to alarm incase breaker doesn’t close properly, not to measure
actual travelling time.
Circuit breaker opening time measurement
From the function operation point of view the opening time measurement is not
as important as closing time. Hence the opening time is always measured in “From
Cmd to Pos” mode which would provide accurate enough information.
9.12.5.8 Recorded data
The transfer related information is stored when the Recorded data module is
triggered. This happens when
Decoupling delay
time is elapsed after TR_RUNNING
signal goes from TRUE to FALSE. Three sets of recorded data are available in total
for each of the measurement. The sets are saved in data banks 1-3.
The data bank 1 of the respective measurement holds the most recent recorded
data. Older data are moved to the subsequent banks (1→2 and 2→3). When all
three banks have data of a respective measurement and there is a new transfer
complete operation, the latest data set is placed into bank 1 and the data in bank 3
is overwritten by the data from bank 2.
The recorded data can be reset with the RESET_REC binary input, from Clear menu
or via communication.
Table 1605: Recorded data
Parameter
Type Description
Transfer mode ENUM Transfer mode
Transfer direction ENUM Transfer direction
Transfer cause ENUM Cause of transfer
Transfer failure ENUM Transfer failure cause
Transfer time TimeStamp The time at which the close
command is issued for trans-
fer
Transfer Dur INT Time between transfer initia-
tion and CB close command
Busbar Max dv/dt REAL Maximum rate of change of
busbar voltage
Busbar Max df/dt REAL Maximum rate of change of
frequency of busbar voltage
Table continues on the next page
1MRS759142 F Control functions
REX640
Technical Manual
1785
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