372
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS
CHAPTER 7: PROTECTION
Figure 309: Breaker flashover scheme logic, sheet 1 of 2
Figure 310: Breaker flashover scheme logic, sheet 2 of 2
Three VT breaker flashover application
When only one set of VTs is available across the breaker, the
Side 2
setting should be
“None”. To detect an open breaker condition in this application, the scheme checks if the
per-phase voltages were recovered (picked up), the status of the breaker is open (contact
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