GE C60 Instruction Manual page 337

5 SETTINGS
• OPEN POLE BROKEN CONDUCTOR: This setting enables or disables detection of broken conductor or remote pole
open conditions.
• OPEN POLE VOLTAGE INPUT: This setting is used to enable/disable the voltage input in making a logical decision. If
the line VT (not bus VT) is available, the voltage input can be set to "Enable".
• OPEN POLE VOLTAGE SOURCE: This setting is used to select the voltage source for the element.
φ
• OPEN POLE A(C) AUX CONTACT: These three settings used to select a FlexLogic operand reflecting the state of
the 52b type phase A circuit breaker auxiliary contact (closed when main breaker contact is open) for single-pole trip-
ping applications. If two breakers per line are used, then both breaker auxiliary contacts feeding into the AND gate
(representing auxiliary contacts connected in series) are to be assigned.
• OPEN POLE PICKUP DELAY: This setting is used to select the pickup delay of the element.
• OPEN POLE RESET DELAY: This setting is used to select the reset delay of the element. The use of this setting
depends on the particular application and whether single-pole or three-pole tripping is used. It should comprise the
reset time of the operating elements it used in conjunction with the breaker opening time and breaker auxiliary contacts
discrepancy with the main contacts.
GE Multilin
Figure 5–85: OPEN POLE DETECTOR SCHEME LOGIC
C60 Breaker Protection System
5.6 GROUPED ELEMENTS
5-201
5