GE D90 Plus - Page 362

352 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS CHAPTER 7: PROTECTION
Figure 297: Terminal three-pole open logic
Terminal one-pole open
The autoreclose scheme also has dedicated logic to determine if one pole is opened at the
local terminal. For single-breaker operation, the BREAKER 1 ONE P OPEN or BREAKER 2 ONE P
OPEN operand is used to derive this signal. For the 1&2 sequence, both breakers must
either declare one pole open or be open or out-of-service. For the 1-2 sequence, breaker 1
must declare one pole open and breaker 2 must declare one pole open or be open or out-
of-service. For the 2-1 sequence, breaker 2 must declare one pole open and breaker 1
must declare one pole open or be open or out-of-service. Alternately, a user-defined
setting is available to generate this signal.
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