GE N60 Instruction Manual page 268

5.6 GROUPED ELEMENTS
• 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.
SETTING
OPEN POLE
FUNCTION:
Disable=0
Enable=1
SETTING
OPEN POLE BLOCK:
Off=0
5
SETTING
OPEN POLE A
AUX CONTACT:
AND
Off=0
SETTING
OPEN POLE B
AUX CONTACT:
AND
Off=0
SETTING
OPEN POLE C
AUX CONTACT:
AND
Off=0
SETTING
OPEN POLE BROKEN
CONDUCTOR:
Enable=1
Disable=0
SETTING
OPEN POLE
CURRENT SOURCE:
AND
A
B
C
SETTING
OPEN POLE
VOLTAGE INPUT:
Enable=1
Disable=0
SETTING
OPEN POLE
VOLTAGE SOURCE:
AND
WYE DELTA
VAG or VAB
VBG or VBC
VCG or VCA
5-138
OR
AND
SETTING
AND
OPEN POLE
CURRENT PICKUP:
AND
RUN
A > SETTING
B > SETTING
C > SETTING
RUN
VA < 75% Nominal
VB < 75% Nominal
VC < 75% Nominal
Figure 5–57: OPEN POLE DETECTOR SCHEME LOGIC
N60 Network Stability and Synchrophasor Measurement System
OR
OR
OR
AND
AND
AND
5 SETTINGS
SETTING
OPEN POLE
PICKUP DELAY:
FLEXLOGIC OPERAND
OPEN POLE
RESET DELAY:
OPEN POLE OP
OR ANY PHASE
A OPEN POLE OP A
B OPEN POLE OP B
C OPEN POLE OP C
827047A6.CDR
GE Multilin