GE UR Series Instruction Manual page 205
Line differential relay
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Also See for UR Series:
- Instruction manual (652 pages) ,
- Manual (433 pages) ,
- Release notes (33 pages)
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5 SETTINGS
OPEN POLE CURRENT PICKUP:
This setting is used to select the pickup value of the phase current. Pickup setting is the minimum of the range and likely to
be somewhat above of the charging current of the line.
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 voltage input in making a logical decision. If line VT (not bus VT) is available, voltage
input can be set to "Enable".
OPEN POLE VOLTAGE SOURCE:
This setting is used to select the source for the voltage for the element.
φ
OPEN POLE
A AUX CONTACT:
This setting is used to select a FlexLogic™ operand reflecting the state of phase A circuit breaker auxiliary contact 52b type
(closed when main breaker contact is open) for single-pole tripping applications. If 2 breakers per line are being employed,
both breaker auxiliary contacts feeding into the AND gate (representing auxiliary contacts connected in series) are to be
assigned.
φ
OPEN POLE
B AUX CONTACT:
As above for phase B for single-pole tripping applications.
φ
OPEN POLE
C AUX CONTACT:
As above for phase C for single-pole tripping applications.
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. Depending on the particular application and whether 1-pole or
3-pole tripping mode is used, this setting should be thoroughly considered. It should comprise the reset time of the operat-
ing elements it used in conjunction with the breaker opening time and breaker auxiliary contacts discrepancy with the main
contacts.
GE Power Management
L90 Line Differential Relay
5.5 GROUPED ELEMENTS
5-121
5
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