GE c60 Instruction Manual page 336

GROUPED ELEMENTS CHAPTER 5: SETTINGS
The open pole detector detects if any pole of the associated circuit breaker is opened or the conductor is broken on the
protected power line and cable. The output FlexLogic operands can be used in three-pole and single-pole tripping
schemes, in reclosing schemes, in blocking some elements (like CT failure), and in signaling or indication schemes. In
single-pole tripping schemes, if flag is set, any other subsequent fault causes a three-phase trip regardless of
OPEN POLE
fault type.
The open pole detector logic detects absence of current in one phase during presence of current in other phases. Phases
A, B, and C breaker auxiliary contacts (if available) are used in addition to make a logic decision for single-pole tripping
applications. If voltage input is available, a low voltage function is used to detect absence of the monitoring voltage in the
associated pole of the breaker.
— Used to enable/disable operation of the element.
OPEN POLE FUNCTION
— Selects a FlexLogic operand that blocks operation of the element.
OPEN POLE BLOCK
— Selects the source for the current for the element.
OPEN POLE CURRENT SOURCE
— Selects the pickup value of the phase current. The pickup setting is the minimum of the
OPEN POLE CURRENT PICKUP
range and likely to be somewhat above of the charging current of the line.
— Enables and disables detection of broken conductor or remote pole open conditions.
OPEN POLE BROKEN CONDUCTOR
— Enables and disables the voltage input in making a logical decision. If the line VT (not bus VT) is
OPEN POLE VOLTAGE INPUT
available, the voltage input can be set to "Enable."
— Selects the voltage source for the element.
OPEN POLE VOLTAGE SOURCE

— These three settings are used to select a FlexLogic operand reflecting the state of the 52b
OPEN POLE A(C) AUX CONTACT
type phase A circuit breaker auxiliary contact (closed when main breaker contact is open) for single-pole tripping
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.
5
— Selects the pickup delay of the element.
OPEN POLE PICKUP DELAY
— This setting is used to select the reset delay of the element. The use of this setting depends on
OPEN POLE RESET DELAY
the particular application and whether single-pole or three-pole tripping is used. It comprises 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.
5-210 C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL