ABB 3BSE027062R50 Distributed control system
The innovative measuring algorithm provides stability for open
or short-circuited main CT secondary circuits, which means
that no separate check zone is actually necessary. Start current
level for open CT detection can usually be set to detect the
open circuit condition for the smallest CT. This built-in feature
allows the protection terminal to be set very sensitive, even to a
lower value than the maximum CT primary rating in the station.
At detection of problems in CT secondary circuits, the
differential protection can be instantly blocked and an alarm is
given. Alternatively, the differential protection can be
automatically desensitized in order to ensure busbar differential
protection stability during normal through-load condition. When
problems in CT secondary circuits have been found and
associated error has been corrected a manual reset must be
given to the IED. This can be done locally from the local HMI, or
remotely via binary input or communication link.
However, it is to be noted that this feature can only be partly
utilized when the summation principle is in use.
PLC module, programmable controller, CPU module, IO module, DO module, AI module, DI module, network communication module,
Ethernet module, motion control module, analog input module, analog output module, digital input module, digital output module
Module, redundant module, power module, relay output module, relay input module, processor module.
Our advantage is: brand new original, with a one-year warranty! All products of our company have undergone strict testing. We welcome inquiries and acquisitions. As long as you have sincerity, our company will provide you with a price advantage over peers and work together to win the order.
This configuration includes only busbar protection for double busbar-single breaker stations, where Zone Selection is done by using a and b auxiliary contacts from every disconnector and/or circuit breaker. Thus full disconnector/breaker supervision is available. This configuration is available for only three REB670 variants (that is A31, B21 and B31). It shall be noted that optional functions breaker failure protection CCRBRF, end fault protection and overcurrent protection PH4SPTOC can be ordered together with this configuration, but they will not be pre-configured. Thus these optional functions shall be configured by the end user.
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