ABB REX 521 Technical Reference Manual, Standard Configurations page 66

REX 521
66
Protection Relay
Technical Reference Manual, Standard Configurations
DC pos. open
DC pos. close
ES pos. open
ES pos. close
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Using disconnector, earth switch and logical inputs
In the cases mentioned above, additional signals, such as SF6 gas low, may be used
to block close operations. Then, these signals should be connected to the
interlocking template using the logic inputs 1...3 (Logic_inpX) selectors. By
selecting "Interlocking_C", "Interlocking_D" or "Interlocking_E" in the "Close
enable" selector, different AND/ OR conditions can be created. Examples:
• DC or ES DQG "Logic_inpX" = "Interlocking_C"
• DC and ES DQG "Logic_inpX" = "Interlocking_D"
• "Logic_inp1" DQG "Logic_inp2" DQG "Logic_inp3" = "Interlocking_E"
In addition to the ones mentioned here, many different kinds of interlocking schemes
can be built by using the selectors to connect digital inputs, inversion to create AND/
OR logic and selecting different interlocking outputs (A...E). See Fig. 5.2.1.-4 for a
complete block diagram.
DC pos. open
&
DC pos. close
ES pos. open
&
ES pos. close
Logic input 1
&
Logic input 2
Logic input 3
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&
&
≥1
&
1MRS 751802-MUM
≥1
Interlocking_A
&
Interlocking_B
Interlocking_A
Interlocking_B
&
Interlocking_C
&
Interlocking_D
Interlocking_E