GE C70 Instruction Manual page 333

CHAPTER 5: SETTINGS
VOLTAGE DIF 1 STG 1 PKP DELAY
each of the 12 comparators (four stages in three phases) uses an individual timer, but settings for these timers are
controlled individually per each stage, not per phase. The timers use a common drop-out time delay specified by the next
setting.
— Controls a drop out delay for the operate FlexLogic operands. Note that individual stages apply
VOLTAGE DIF 1 DPO DELAY
individually configurable pickup delays, but use this common drop out delay.
to
VOLT DIF 1 BLK STG 1 VOLT DIF 1 BLK STG 4
required. At minimum this function shall be blocked when the bank is offline, or else it operates unnecessarily. Either
breaker position or undercurrent indication via any available instantaneous function, or a combination, can be used for
blocking. Also consider the VT fuse fail condition from both the bus and tap VT. When unblocked, the function becomes
operational after five cycles of intentional delay.
SETTINGS
VOLT DIF 1 BLK STG1:
Off = 0
INHIBIT STAGE 1
VOLT DIF 1 BLK STG2:
Off = 0
INHIBIT STAGE 2
VOLT DIF 1 BLK STG3:
Off = 0
INHIBIT STAGE 3
VOLT DIF 1 BLK STG4:
Off = 0
INHIBIT STAGE 4
VOLTAGE DIF 1
FUNCTION:
Enabled = 1
VA_mag > 0.25 pu
VB_mag > 0.25 pu
VC_mag > 0.25 pu
SETTINGS
VOLTAGE DIF 1
SETTINGS
MATCH FACTOR A:
VOLTAGE DIF 1 BUS VOLTAGE DIF 1 BANK
SOURCE: GROUND:
V1A
V1B
V1C
VOLTAGE DIF 1 TAP
SOURCE:
V2A
V2B
V2C
VN
PHASE B
PHASE C
5.7.8.8 Bank phase overvoltage (ANSI 59B, IEC PTOV)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  VOLTAGE ELEMENTS  BANK OVERVOLTAGE 
BANK OVERVOLTAGE 1(3)
 BANK OVERVOLTAGE 1

C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
— Specifies the pickup time delay, individually per each stage of alarming/tripping. Note that
— These inputs are used to block the function on a per stage basis when
Figure 5-107: Voltage differential logic
TIMER
5 cycles
RUN 87V FUNCTION
0
SETTING
COMMANDS/
VOLTAGE DIF 1
AUTO-SETTING:
Auto
Manual
Apply?
SETTING
VOLTAGE DIF 1 STG
1A PICKUP:
RUN
VA_dif > PICKUP
SETTING
VOLTAGE DIF 1 STG
2A PICKUP:
RUN
VA_dif > PICKUP
SETTING
VOLTAGE DIF 1 STG
3A PICKUP:
RUN
VA_dif > PICKUP
SETTING
VOLTAGE DIF 1 STG
4A PICKUP:
RUN
VA_dif > PICKUP
BANK OV 1

FUNCTION: Disabled
BANK OV 1 BUS

SOURCE: SRC 1
COMMANDS
AUTO-SETTING
PROCEDURE
TIMERS
WRITE A NEW SETTING
VOLTAGE DIF 1 DPO
DELAY:
VOLTAGE DIF 1 STG 1
PKP DELAY:
FLEXLOGIC OPERAND
t
PKP
VOLT DIF 1 STG 1A PKP
t
DPO
VOLTAGE DIF 1 STG 2
PKP DELAY:
FLEXLOGIC OPERAND
t
PKP
VOLT DIF 1 STG 2A PKP
t
DPO
VOLTAGE DIF 1 STG 3
PKP DELAY:
FLEXLOGIC OPERAND
t
PKP
VOLT DIF 1 STG 3A PKP
t
DPO
VOLTAGE DIF 1 STG 4
PKP DELAY:
FLEXLOGIC OPERAND
t
PKP
VOLT DIF 1 STG 4A PKP
t DPO
FLEXLOGIC OPERAND
VOLT DIF 1 PKP A
VOLT DIF 1 PKP B
VOLT DIF 1 PKP C
FLEXLOGIC OPERAND
VOLT DIF 1 PKP
VOLT DIF 1 DPO
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
GROUPED ELEMENTS
5
FLEXLOGIC OPERAND
VOLT DIF 1 STG 1A OP
FLEXLOGIC OPERAND
VOLT DIF 1 STG 2A OP
FLEXLOGIC OPERAND
VOLT DIF 1 STG 3A OP
FLEXLOGIC OPERAND
VOLT DIF 1 STG 4A OP
FLEXLOGIC OPERAND
VOLT DIF 1 OP A
VOLT DIF 1 OP B
VOLT DIF 1 OP C
FLEXLOGIC OPERAND
VOLT DIF 1 OP
834742A1.DWG
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