U3P1 U3P2 U3P_BB Note
Allowed only if Uo is
also measured from
U3P1 and U3P2
3 phase-to-ground 3 phase-to-ground 1 phase-to-ground Supported
1 phase-to-phase 1 phase-to-phase 1 phase-to-phase Limited functionality
1 phase-to-ground 1 phase-to-ground 1 phase-to-ground Limited functionality
Limited functionality due to limited voltage connections is related to under-voltage
triggering. In case only one voltage is connected, function is blind to unconnected
phases. In this case external triggering is recommended.
Phase currents can be left unconnected but then circuit breaker monitoring has
limited functionality available. Recommendation is to connect full three phase
current triplet to both I3P inputs.
Table 1602: Supported current connections
I3P1
I3P2 Note
All three phases connected All three phases connected Recommended
Not connected Not connected Limited functionality
9.12.5 Operation principle
The
Operation
setting is used to enable or disable the function. When selected "On"
the function is enabled and respectively "Off" means function is disabled. Function
state can be controlled also with level sensitive TRANSFER_ON input. If input is TRUE,
function is “On” and if input is FALSE, function is “Off”. If TRANSFER_ON input is not
connected in relay configuration tool, then status is “On”. The operation of HSABTC
is described by a module diagram presented in
Figure 932
. All the modules in the
diagram are explained in the next sections.
1MRS759142 F
Control functions
REX640
Technical Manual
1761
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