Application Guide - NP900 Series
488 (504
)
A996A
1ms. Function provides also cumulative counters for Open operations, Alarm 1 and Alarm
2 events. Operations left for each phase can be monitored also in the function.
In the following figure is presented the simplified function block diagram of the CBW
function.
Figure 3.7.5-233 Simplified function block diagram of the CBW function.
3.7.5.1
M
EASURED INPUT VALUES
Function block uses analog current measurement values. Function always uses the
fundamental frequency magnitude of the current measurement input.
Table 3.7.5.1-284 Analogic magnitudes used by the CBW function.
Signal
Description
Time base
IL1RMS
Fundamental RMS measurement of phase L1/A current
5 ms
IL2RMS
Fundamental RMS measurement of phase L2/B current
5 ms
IL3RMS
Fundamental RMS measurement of phase L3/C current
5 ms
3.7.5.2
C
IRCUIT BREAKER CHARACTERISTICS SETTINGS
The circuit breaker characteristics is set by two operating points where are defined the
maximum allowed breaking current of the breaker, nominal breaking current and
corresponding interrupts allowed. This data is provided by the circuit breaker
manufacturer.
